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diff --git a/src/kernel/qwidget.cpp b/src/kernel/qwidget.cpp new file mode 100644 index 0000000..856907c --- /dev/null +++ b/src/kernel/qwidget.cpp @@ -0,0 +1,6081 @@ +/**************************************************************************** +** +** Implementation of QWidget class +** +** Created : 931031 +** +** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved. +** +** This file is part of the kernel module of the Qt GUI Toolkit. +** +** This file may be used under the terms of the GNU General +** Public License versions 2.0 or 3.0 as published by the Free +** Software Foundation and appearing in the files LICENSE.GPL2 +** and LICENSE.GPL3 included in the packaging of this file. +** Alternatively you may (at your option) use any later version +** of the GNU General Public License if such license has been +** publicly approved by Trolltech ASA (or its successors, if any) +** and the KDE Free Qt Foundation. +** +** Please review the following information to ensure GNU General +** Public Licensing requirements will be met: +** http://trolltech.com/products/qt/licenses/licensing/opensource/. +** If you are unsure which license is appropriate for your use, please +** review the following information: +** http://trolltech.com/products/qt/licenses/licensing/licensingoverview +** or contact the sales department at sales@trolltech.com. +** +** This file may be used under the terms of the Q Public License as +** defined by Trolltech ASA and appearing in the file LICENSE.QPL +** included in the packaging of this file. Licensees holding valid Qt +** Commercial licenses may use this file in accordance with the Qt +** Commercial License Agreement provided with the Software. +** +** This file is provided "AS IS" with NO WARRANTY OF ANY KIND, +** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR +** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted +** herein. +** +**********************************************************************/ + + +#include "qobjectlist.h" +#include "qwidget.h" +#include "qwidgetlist.h" +#include "qwidgetintdict.h" +#include "qptrdict.h" +#include "qfocusdata.h" +#include "qcursor.h" +#include "qpixmap.h" +#include "qapplication.h" +#include "qapplication_p.h" +#include "qbrush.h" +#include "qlayout.h" +#include "qstylefactory.h" +#include "qcleanuphandler.h" +#include "qstyle.h" +#include "qmetaobject.h" +#include "qguardedptr.h" +#if defined(QT_ACCESSIBILITY_SUPPORT) +#include "qaccessible.h" +#endif +#if defined(Q_WS_WIN) +#include "qt_windows.h" +#include "qinputcontext_p.h" +#endif +#if defined(Q_WS_QWS) +#include "qwsmanager_qws.h" +#endif +#include "qfontdata_p.h" + + +/*! + \class QWidget qwidget.h + \brief The QWidget class is the base class of all user interface objects. + + \ingroup abstractwidgets + \mainclass + + The widget is the atom of the user interface: it receives mouse, + keyboard and other events from the window system, and paints a + representation of itself on the screen. Every widget is + rectangular, and they are sorted in a Z-order. A widget is + clipped by its parent and by the widgets in front of it. + + A widget that isn't embedded in a parent widget is called a + top-level widget. Usually, top-level widgets are windows with a + frame and a title bar (although it is also possible to create + top-level widgets without such decoration if suitable widget flags + are used). In Qt, QMainWindow and the various subclasses of + QDialog are the most common top-level windows. + + A widget without a parent widget is always a top-level widget. + + Non-top-level widgets are child widgets. These are child windows + in their parent widgets. You cannot usually distinguish a child + widget from its parent visually. Most other widgets in Qt are + useful only as child widgets. (It is possible to make, say, a + button into a top-level widget, but most people prefer to put + their buttons inside other widgets, e.g. QDialog.) + + If you want to use a QWidget to hold child widgets you will + probably want to add a layout to the parent QWidget. (See \link + layout.html Layouts\endlink.) + + QWidget has many member functions, but some of them have little + direct functionality: for example, QWidget has a font property, + but never uses this itself. There are many subclasses which + provide real functionality, such as QPushButton, QListBox and + QTabDialog, etc. + + \section1 Groups of functions: + + \table + \header \i Context \i Functions + + \row \i Window functions \i + show(), + hide(), + raise(), + lower(), + close(). + + \row \i Top level windows \i + caption(), + setCaption(), + icon(), + setIcon(), + iconText(), + setIconText(), + isActiveWindow(), + setActiveWindow(), + showMinimized(). + showMaximized(), + showFullScreen(), + showNormal(). + + \row \i Window contents \i + update(), + repaint(), + erase(), + scroll(), + updateMask(). + + \row \i Geometry \i + pos(), + size(), + rect(), + x(), + y(), + width(), + height(), + sizePolicy(), + setSizePolicy(), + sizeHint(), + updateGeometry(), + layout(), + move(), + resize(), + setGeometry(), + frameGeometry(), + geometry(), + childrenRect(), + adjustSize(), + mapFromGlobal(), + mapFromParent() + mapToGlobal(), + mapToParent(), + maximumSize(), + minimumSize(), + sizeIncrement(), + setMaximumSize(), + setMinimumSize(), + setSizeIncrement(), + setBaseSize(), + setFixedSize() + + \row \i Mode \i + isVisible(), + isVisibleTo(), + isMinimized(), + isDesktop(), + isEnabled(), + isEnabledTo(), + isModal(), + isPopup(), + isTopLevel(), + setEnabled(), + hasMouseTracking(), + setMouseTracking(), + isUpdatesEnabled(), + setUpdatesEnabled(), + clipRegion(). + + \row \i Look and feel \i + style(), + setStyle(), + cursor(), + setCursor() + font(), + setFont(), + palette(), + setPalette(), + backgroundMode(), + setBackgroundMode(), + colorGroup(), + fontMetrics(), + fontInfo(). + + \row \i Keyboard focus<br>functions \i + isFocusEnabled(), + setFocusPolicy(), + focusPolicy(), + hasFocus(), + setFocus(), + clearFocus(), + setTabOrder(), + setFocusProxy(). + + \row \i Mouse and<br>keyboard grabbing \i + grabMouse(), + releaseMouse(), + grabKeyboard(), + releaseKeyboard(), + mouseGrabber(), + keyboardGrabber(). + + \row \i Event handlers \i + event(), + mousePressEvent(), + mouseReleaseEvent(), + mouseDoubleClickEvent(), + mouseMoveEvent(), + keyPressEvent(), + keyReleaseEvent(), + focusInEvent(), + focusOutEvent(), + wheelEvent(), + enterEvent(), + leaveEvent(), + paintEvent(), + moveEvent(), + resizeEvent(), + closeEvent(), + dragEnterEvent(), + dragMoveEvent(), + dragLeaveEvent(), + dropEvent(), + childEvent(), + showEvent(), + hideEvent(), + customEvent(). + + \row \i Change handlers \i + enabledChange(), + fontChange(), + paletteChange(), + styleChange(), + windowActivationChange(). + + \row \i System functions \i + parentWidget(), + topLevelWidget(), + reparent(), + polish(), + winId(), + find(), + metric(). + + \row \i What's this help \i + customWhatsThis() + + \row \i Internal kernel<br>functions \i + focusNextPrevChild(), + wmapper(), + clearWFlags(), + getWFlags(), + setWFlags(), + testWFlags(). + + \endtable + + Every widget's constructor accepts two or three standard arguments: + \list 1 + \i \c{QWidget *parent = 0} is the parent of the new widget. + If it is 0 (the default), the new widget will be a top-level window. + If not, it will be a child of \e parent, and be constrained by \e + parent's geometry (unless you specify \c WType_TopLevel as + widget flag). + \i \c{const char *name = 0} is the widget name of the new + widget. You can access it using name(). The widget name is little + used by programmers but is quite useful with GUI builders such as + \e{Qt Designer} (you can name a widget in \e{Qt Designer}, and + connect() to it using the name in your code). The dumpObjectTree() + debugging function also uses it. + \i \c{WFlags f = 0} (where available) sets the widget flags; the + default is suitable for almost all widgets, but to get, for + example, a top-level widget without a window system frame, you + must use special flags. + \endlist + + The tictac/tictac.cpp example program is good example of a simple + widget. It contains a few event handlers (as all widgets must), a + few custom routines that are specific to it (as all useful widgets + do), and has a few children and connections. Everything it does + is done in response to an event: this is by far the most common way + to design GUI applications. + + You will need to supply the content for your widgets yourself, but + here is a brief run-down of the events, starting with the most common + ones: + + \list + + \i paintEvent() - called whenever the widget needs to be + repainted. Every widget which displays output must implement it, + and it is wise \e not to paint on the screen outside + paintEvent(). + + \i resizeEvent() - called when the widget has been resized. + + \i mousePressEvent() - called when a mouse button is pressed. + There are six mouse-related events, but the mouse press and mouse + release events are by far the most important. A widget receives + mouse press events when the mouse is inside it, or when it has + grabbed the mouse using grabMouse(). + + \i mouseReleaseEvent() - called when a mouse button is released. + A widget receives mouse release events when it has received the + corresponding mouse press event. This means that if the user + presses the mouse inside \e your widget, then drags the mouse to + somewhere else, then releases, \e your widget receives the release + event. There is one exception: if a popup menu appears while the + mouse button is held down, this popup immediately steals the mouse + events. + + \i mouseDoubleClickEvent() - not quite as obvious as it might seem. + If the user double-clicks, the widget receives a mouse press event + (perhaps a mouse move event or two if they don't hold the mouse + quite steady), a mouse release event and finally this event. It is + \e{not possible} to distinguish a click from a double click until you've + seen whether the second click arrives. (This is one reason why most GUI + books recommend that double clicks be an extension of single clicks, + rather than trigger a different action.) + + \endlist + + If your widget only contains child widgets, you probably do not need to + implement any event handlers. If you want to detect a mouse click in + a child widget call the child's hasMouse() function inside the + parent widget's mousePressEvent(). + + Widgets that accept keyboard input need to reimplement a few more + event handlers: + + \list + + \i keyPressEvent() - called whenever a key is pressed, and again + when a key has been held down long enough for it to auto-repeat. + Note that the Tab and Shift+Tab keys are only passed to the widget + if they are not used by the focus-change mechanisms. To force those + keys to be processed by your widget, you must reimplement + QWidget::event(). + + \i focusInEvent() - called when the widget gains keyboard focus + (assuming you have called setFocusPolicy()). Well written widgets + indicate that they own the keyboard focus in a clear but discreet + way. + + \i focusOutEvent() - called when the widget loses keyboard focus. + + \endlist + + Some widgets will also need to reimplement some of the less common + event handlers: + + \list + + \i mouseMoveEvent() - called whenever the mouse moves while a + button is held down. This is useful for, for example, dragging. If + you call setMouseTracking(TRUE), you get mouse move events even + when no buttons are held down. (Note that applications which make + use of mouse tracking are often not very useful on low-bandwidth X + connections.) (See also the \link dnd.html drag and drop\endlink + information.) + + \i keyReleaseEvent() - called whenever a key is released, and also + while it is held down if the key is auto-repeating. In that case + the widget receives a key release event and immediately a key press + event for every repeat. Note that the Tab and Shift+Tab keys are + only passed to the widget if they are not used by the focus-change + mechanisms. To force those keys to be processed by your widget, you + must reimplement QWidget::event(). + + \i wheelEvent() -- called whenever the user turns the mouse wheel + while the widget has the focus. + + \i enterEvent() - called when the mouse enters the widget's screen + space. (This excludes screen space owned by any children of the + widget.) + + \i leaveEvent() - called when the mouse leaves the widget's screen + space. + + \i moveEvent() - called when the widget has been moved relative to its + parent. + + \i closeEvent() - called when the user closes the widget (or when + close() is called). + + \endlist + + There are also some rather obscure events. They are listed in + \c qevent.h and you need to reimplement event() to handle them. + The default implementation of event() handles Tab and Shift+Tab + (to move the keyboard focus), and passes on most other events to + one of the more specialized handlers above. + + When implementing a widget, there are a few more things to + consider. + + \list + + \i In the constructor, be sure to set up your member variables + early on, before there's any chance that you might receive an event. + + \i It is almost always useful to reimplement sizeHint() and to set + the correct size policy with setSizePolicy(), so users of your class + can set up layout management more easily. A size policy lets you + supply good defaults for the layout management handling, so that + other widgets can contain and manage yours easily. sizeHint() + indicates a "good" size for the widget. + + \i If your widget is a top-level window, setCaption() and setIcon() set + the title bar and icon respectively. + + \endlist + + \sa QEvent, QPainter, QGridLayout, QBoxLayout +*/ + + +/***************************************************************************** + Internal QWidgetMapper class + + The purpose of this class is to map widget identifiers to QWidget objects. + All QWidget objects register themselves in the QWidgetMapper when they + get an identifier. Widgets unregister themselves when they change ident- + ifier or when they are destroyed. A widget identifier is really a window + handle. + + The widget mapper is created and destroyed by the main application routines + in the file qapp_xxx.cpp. + *****************************************************************************/ + +#if defined(Q_WS_QWS) || defined(Q_OS_TEMP) +static const int WDictSize = 163; // plenty for small devices +#else +static const int WDictSize = 1123; // plenty for 5 big complex windows +#endif + +class QWidgetMapper : public QWidgetIntDict +{ // maps ids -> widgets +public: + QWidgetMapper(); + ~QWidgetMapper(); + QWidget *find( WId id ); // find widget + void insert( const QWidget * ); // insert widget + bool remove( WId id ); // remove widget +private: + WId cur_id; + QWidget *cur_widget; +}; + +QWidgetMapper *QWidget::mapper = 0; // app global widget mapper + + +QWidgetMapper::QWidgetMapper() : QWidgetIntDict(WDictSize) +{ + cur_id = 0; + cur_widget = 0; +} + +QWidgetMapper::~QWidgetMapper() +{ + clear(); +} + +inline QWidget *QWidgetMapper::find( WId id ) +{ + if ( id != cur_id ) { // need to lookup + cur_widget = QWidgetIntDict::find((long)id); + if ( cur_widget ) + cur_id = id; + else + cur_id = 0; + } + return cur_widget; +} + +inline void QWidgetMapper::insert( const QWidget *widget ) +{ + QWidgetIntDict::insert((long)widget->winId(),widget); +} + +inline bool QWidgetMapper::remove( WId id ) +{ + if ( cur_id == id ) { // reset current widget + cur_id = 0; + cur_widget = 0; + } + return QWidgetIntDict::remove((long)id); +} + + +/***************************************************************************** + QWidget utility functions + *****************************************************************************/ + +static QFont qt_naturalWidgetFont( QWidget* w ) { + QFont naturalfont = QApplication::font( w ); + if ( ! w->isTopLevel() ) { + if ( ! naturalfont.isCopyOf( QApplication::font() ) ) + naturalfont = naturalfont.resolve( w->parentWidget()->font() ); + else + naturalfont = w->parentWidget()->font(); + } + return naturalfont; +} + +#ifndef QT_NO_PALETTE +static QPalette qt_naturalWidgetPalette( QWidget* w ) { + QPalette naturalpalette = QApplication::palette( w ); + if ( !w->isTopLevel() && naturalpalette.isCopyOf( QApplication::palette() ) ) + naturalpalette = w->parentWidget()->palette(); + return naturalpalette; +} +#endif + +QSize qt_naturalWidgetSize( QWidget *w ) { + QSize s = w->sizeHint(); + QSizePolicy::ExpandData exp; +#ifndef QT_NO_LAYOUT + if ( w->layout() ) { + if ( w->layout()->hasHeightForWidth() ) + s.setHeight( w->layout()->totalHeightForWidth( s.width() ) ); + exp = w->layout()->expanding(); + } else +#endif + { + if ( w->sizePolicy().hasHeightForWidth() ) + s.setHeight( w->heightForWidth( s.width() ) ); + exp = w->sizePolicy().expanding(); + } + if ( exp & QSizePolicy::Horizontally ) + s.setWidth( QMAX( s.width(), 200 ) ); + if ( exp & QSizePolicy::Vertically ) + s.setHeight( QMAX( s.height(), 150 ) ); +#if defined(Q_WS_X11) + QRect screen = QApplication::desktop()->screenGeometry( w->x11Screen() ); +#else // all others + QRect screen = QApplication::desktop()->screenGeometry( w->pos() ); +#endif + s.setWidth( QMIN( s.width(), screen.width()*2/3 ) ); + s.setHeight( QMIN( s.height(), screen.height()*2/3 ) ); + return s; +} + +/***************************************************************************** + QWidget member functions + *****************************************************************************/ + +/* + Widget state flags: + \list + \i WState_Created The widget has a valid winId(). + \i WState_Disabled The widget does not receive any mouse or keyboard + events. + \i WState_ForceDisabled The widget is explicitly disabled, i.e. it + will remain disabled even when all its ancestors are set to the enabled + state. This implies WState_Disabled. + \i WState_Visible The widget is currently visible. + \i WState_ForceHide The widget is explicitly hidden, i.e. it won't + become visible unless you call show() on it. WState_ForceHide + implies !WState_Visible. + \i WState_OwnCursor A cursor has been set for this widget. + \i WState_MouseTracking Mouse tracking is enabled. + \i WState_CompressKeys Compress keyboard events. + \i WState_BlockUpdates Repaints and updates are disabled. + \i WState_InPaintEvent Currently processing a paint event. + \i WState_Reparented The widget has been reparented. + \i WState_ConfigPending A configuration (resize/move) event is pending. + \i WState_Resized The widget has been resized. + \i WState_AutoMask The widget has an automatic mask, see setAutoMask(). + \i WState_Polished The widget has been "polished" (i.e. late + initialization) by a QStyle. + \i WState_DND The widget supports drag and drop, see setAcceptDrops(). + \i WState_Exposed the widget was finally exposed (X11 only, + helps avoid paint event doubling). + \i WState_HasMouse The widget is under the mouse cursor. + \endlist +*/ + +/*! \enum Qt::WFlags + \internal */ +/*! \enum Qt::WState + \internal */ + +/*! + \enum Qt::WidgetFlags + + \keyword widget flag + + This enum type is used to specify various window-system properties + for the widget. They are fairly unusual but necessary in a few + cases. Some of these flags depend on whether the underlying window + manager supports them. (See the \link toplevel-example.html + toplevel example\endlink for an explanation and example of their + use.) + + The main types are + + \value WType_TopLevel indicates that this widget is a top-level + widget, usually with a window-system frame and so on. + + \value WType_Dialog indicates that this widget is a top-level + window that should be decorated as a dialog (i.e. typically no + maximize or minimize buttons in the title bar). If you want to use + it as a modal dialog it should be launched from another window, or + have a parent and this flag should be combined with \c WShowModal. + If you make it modal, the dialog will prevent other top-level + windows in the application from getting any input. \c WType_Dialog + implies \c WType_TopLevel. We refer to a top-level window that has + a parent as a \e secondary window. (See also \c WGroupLeader.) + + \value WType_Popup indicates that this widget is a popup + top-level window, i.e. that it is modal, but has a window system + frame appropriate for popup menus. \c WType_Popup implies + WType_TopLevel. + + \value WType_Desktop indicates that this widget is the desktop. + See also \c WPaintDesktop below. \c WType_Desktop implies \c + WType_TopLevel. + + There are also a number of flags which you can use to customize + the appearance of top-level windows. These have no effect on other + windows: + + \value WStyle_Customize indicates that the \c WStyle_* flags + should be used to build the window instead of the default flags. + + \value WStyle_NormalBorder gives the window a normal border. + This cannot be combined with \c WStyle_DialogBorder or \c + WStyle_NoBorder. + + \value WStyle_DialogBorder gives the window a thin dialog border. + This cannot be combined with \c WStyle_NormalBorder or \c + WStyle_NoBorder. + + \value WStyle_NoBorder produces a borderless window. Note that + the user cannot move or resize a borderless window via the window + system. This cannot be combined with \c WStyle_NormalBorder or \c + WStyle_DialogBorder. On Windows, the flag works fine. On X11, the + result of the flag is dependent on the window manager and its + ability to understand MOTIF and/or NETWM hints: most existing + modern window managers can handle this. With \c WX11BypassWM, you + can bypass the window manager completely. This results in a + borderless window that is not managed at all (i.e. no keyboard + input unless you call setActiveWindow() manually). + + \value WStyle_NoBorderEx this value is obsolete. It has the same + effect as using \c WStyle_NoBorder. + + \value WStyle_Title gives the window a title bar. + + \value WStyle_SysMenu adds a window system menu. + + \value WStyle_Minimize adds a minimize button. Note that on + Windows this has to be combined with \c WStyle_SysMenu for it to + work. + + \value WStyle_Maximize adds a maximize button. Note that on + Windows this has to be combined with \c WStyle_SysMenu for it to work. + + \value WStyle_MinMax is equal to \c + WStyle_Minimize|WStyle_Maximize. Note that on Windows this has to + be combined with \c WStyle_SysMenu to work. + + \value WStyle_ContextHelp adds a context help button to dialogs. + + \value WStyle_Tool makes the window a tool window. A tool window + is often a small window with a smaller than usual title bar and + decoration, typically used for collections of tool buttons. It + there is a parent, the tool window will always be kept on top of + it. If there isn't a parent, you may consider passing \c + WStyle_StaysOnTop as well. If the window system supports it, a + tool window can be decorated with a somewhat lighter frame. It can + also be combined with \c WStyle_NoBorder. + + \value WStyle_StaysOnTop informs the window system that the + window should stay on top of all other windows. Note that on some + window managers on X11 you also have to pass \c WX11BypassWM for + this flag to work correctly. + + \value WStyle_Dialog indicates that the window is a logical + subwindow of its parent (i.e. a dialog). The window will not get + its own taskbar entry and will be kept on top of its parent by the + window system. Usually it will also be minimized when the parent + is minimized. If not customized, the window is decorated with a + slightly simpler title bar. This is the flag QDialog uses. + + \value WStyle_Splash indicates that the window is a splash screen. + On X11, we try to follow NETWM standard for a splash screen window if the + window manager supports is otherwise it is equivalent to \c WX11BypassWM. On + other platforms, it is equivalent to \c WStyle_NoBorder \c | \c WMacNoSheet \c | + \c WStyle_Tool \c | \c WWinOwnDC + + Modifier flags: + + \value WDestructiveClose makes Qt delete this widget when the + widget has accepted closeEvent(), or when the widget tried to + ignore closeEvent() but could not. + + \value WPaintDesktop gives this widget paint events for the + desktop. + + \value WPaintUnclipped makes all painters operating on this + widget unclipped. Children of this widget or other widgets in + front of it do not clip the area the painter can paint on. + + \value WPaintClever indicates that Qt should \e not try to + optimize repainting for the widget, but instead pass on window + system repaint events directly. (This tends to produce more events + and smaller repaint regions.) + + \value WMouseNoMask indicates that even if the widget has a mask, + it wants mouse events for its entire rectangle. + + \value WStaticContents indicates that the widget contents are + north-west aligned and static. On resize, such a widget will + receive paint events only for the newly visible part of itself. + + \value WNoAutoErase indicates that the widget paints all its + pixels. Updating, resizing, scrolling and focus changes should + therefore not erase the widget. This allows smart-repainting to + avoid flicker. + + \value WResizeNoErase this value is obsolete; use WNoAutoErase instead. + \value WRepaintNoErase this value is obsolete; use WNoAutoErase instead. + \value WGroupLeader makes this window a group leader. A group + leader should \e not have a parent (i.e. it should be a top-level + window). Any decendant windows (direct or indirect) of a group + leader are in its group; other windows are not. If you show a + secondary window from the group (i.e. show a window whose top-most + parent is a group leader), that window will be modal with respect + to the other windows in the group, but modeless with respect to + windows in other groups. + + Miscellaneous flags + + \value WShowModal see WType_Dialog + + Internal flags. + + \value WNoMousePropagation + \value WStaticContents + \value WStyle_Reserved + \value WSubWindow + \value WType_Modal + \value WWinOwnDC + \value WX11BypassWM + \value WMacNoSheet + \value WMacDrawer + \value WStyle_Mask + \value WType_Mask + +*/ + +/*! + \enum Qt::WidgetState + + Internal flags. + + \value WState_Created + \value WState_Disabled + \value WState_Visible + \value WState_ForceHide + \value WState_OwnCursor + \value WState_MouseTracking + \value WState_CompressKeys + \value WState_BlockUpdates + \value WState_InPaintEvent + \value WState_Reparented + \value WState_ConfigPending + \value WState_Resized + \value WState_AutoMask + \value WState_Polished + \value WState_DND + \value WState_Reserved0 \e internal + \value WState_CreatedHidden + \value WState_Maximized + \value WState_Minimized + \value WState_ForceDisabled + \value WState_Exposed + \value WState_HasMouse + \value WState_CreatedHidden + \value WState_OwnSizePolicy + \value WState_FullScreen +*/ + + +/*! + \enum Qt::WindowState + + \keyword window state + + This enum type is used to specify the current state of a top-level + window. + + The states are + + \value WindowNoState The window has no state set (in normal state). + \value WindowMinimized The window is minimized (i.e. iconified). + \value WindowMaximized The window is maximized with a frame around it. + \value WindowFullScreen The window fills the entire screen without any frame around it. + \value WindowActive The window is the active window, i.e. it has keyboard focus. + +*/ + +/*! + Constructs a widget which is a child of \a parent, with the name + \a name and widget flags set to \a f. + + If \a parent is 0, the new widget becomes a top-level window. If + \a parent is another widget, this widget becomes a child window + inside \a parent. The new widget is deleted when its \a parent is + deleted. + + The \a name is sent to the QObject constructor. + + The widget flags argument, \a f, is normally 0, but it can be set + to customize the window frame of a top-level widget (i.e. \a + parent must be 0). To customize the frame, set the \c + WStyle_Customize flag OR'ed with any of the \l Qt::WidgetFlags. + + If you add a child widget to an already visible widget you must + explicitly show the child to make it visible. + + Note that the X11 version of Qt may not be able to deliver all + combinations of style flags on all systems. This is because on + X11, Qt can only ask the window manager, and the window manager + can override the application's settings. On Windows, Qt can set + whatever flags you want. + + Example: + \code + QLabel *splashScreen = new QLabel( 0, "mySplashScreen", + WStyle_Customize | WStyle_Splash ); + \endcode +*/ + +QWidget::QWidget( QWidget *parent, const char *name, WFlags f ) + : QObject( parent, name ), QPaintDevice( QInternal::Widget ) +{ +#if defined(QT_CHECK_STATE) && !defined(Q_WS_WIN) + if ( qApp->type() == QApplication::Tty ) { + qWarning( "QWidget: Cannot create a QWidget when no GUI " + "is being used" ); + } +#endif + + fstrut_dirty = 1; + + isWidget = TRUE; // is a widget + winid = 0; // default attributes + widget_state = 0; + widget_flags = f; + focus_policy = 0; + own_font = 0; + own_palette = 0; + sizehint_forced = 0; + is_closing = 0; + in_show = 0; + in_show_maximized = 0; + im_enabled = FALSE; +#ifndef QT_NO_LAYOUT + lay_out = 0; +#endif + extra = 0; // no extra widget info +#ifndef QT_NO_PALETTE + bg_col = pal.active().background(); // default background color +#endif + create(); // platform-dependent init +#ifndef QT_NO_PALETTE + pal = isTopLevel() ? QApplication::palette() : parentWidget()->palette(); +#endif + if ( ! isTopLevel() ) + fnt = parentWidget()->font(); +#if defined(Q_WS_X11) + fnt.x11SetScreen( x11Screen() ); +#endif // Q_WS_X11 + + if ( !isDesktop() ) + setBackgroundFromMode(); //### parts of this are done in create but not all (see reparent(...) ) + // make sure move/resize events are sent to all widgets + QApplication::postEvent( this, new QMoveEvent( crect.topLeft(), + crect.topLeft() ) ); + QApplication::postEvent( this, new QResizeEvent(crect.size(), + crect.size()) ); + if ( isTopLevel() ) { + setWState( WState_ForceHide | WState_CreatedHidden ); + QFocusData *fd = focusData( TRUE ); + if ( fd->focusWidgets.findRef(this) < 0 ) + fd->focusWidgets.append( this ); + } else { + // propagate enabled state + if ( !parentWidget()->isEnabled() ) + setWState( WState_Disabled ); + // new widgets do not show up in already visible parents + if ( parentWidget()->isVisible() ) + setWState( WState_ForceHide | WState_CreatedHidden ); + } + if ( ++instanceCounter > maxInstances ) + maxInstances = instanceCounter; +} + +/*! + Destroys the widget. + + All this widget's children are deleted first. The application + exits if this widget is the main widget. +*/ + +QWidget::~QWidget() +{ +#if defined (QT_CHECK_STATE) + if ( paintingActive() ) + qWarning( "%s (%s): deleted while being painted", className(), name() ); +#endif + + // Remove myself and all children from the can-take-focus list + QFocusData *f = focusData( FALSE ); + if ( f ) { + QPtrListIterator<QWidget> it(f->focusWidgets); + QWidget *w; + while ( (w = it.current()) ) { + ++it; + QWidget * p = w; + while( p && p != this ) + p = p->parentWidget(); + if ( p ) // my descendant + f->focusWidgets.removeRef( w ); + } + } + --instanceCounter; + + if ( QApplication::main_widget == this ) { // reset main widget + QApplication::main_widget = 0; + if (qApp) + qApp->quit(); + } + + if ( hasFocus() ) + clearFocus(); + + if ( isTopLevel() && isShown() && winId() ) + hide(); + + // A parent widget must destroy all its children before destroying itself + if ( childObjects ) { // delete children objects + QObjectListIt it(*childObjects); + QObject *obj; + while ( (obj=it.current()) ) { + ++it; + obj->parentObj = 0; + childObjects->removeRef( obj ); + delete obj; + } + delete childObjects; + childObjects = 0; + } + + QApplication::removePostedEvents( this ); + + destroy(); // platform-dependent cleanup + if ( extra ) + deleteExtra(); +} + +int QWidget::instanceCounter = 0; // Current number of widget instances +int QWidget::maxInstances = 0; // Maximum number of widget instances + +/*! + \internal + Creates the global widget mapper. + The widget mapper converts window handles to widget pointers. + \sa destroyMapper() +*/ + +void QWidget::createMapper() +{ + mapper = new QWidgetMapper; + Q_CHECK_PTR( mapper ); +} + +/*! + \internal + Destroys the global widget mapper. + \sa createMapper() +*/ + +void QWidget::destroyMapper() +{ + if ( !mapper ) // already gone + return; + QWidgetIntDictIt it( *((QWidgetIntDict*)mapper) ); + QWidgetMapper * myMapper = mapper; + mapper = 0; + register QWidget *w; + while ( (w=it.current()) ) { // remove parents widgets + ++it; + if ( !w->parentObj ) // widget is a parent + w->destroy( TRUE, TRUE ); + } + delete myMapper; +} + + +static QWidgetList *wListInternal( QWidgetMapper *mapper, bool onlyTopLevel ) +{ + QWidgetList *list = new QWidgetList; + Q_CHECK_PTR( list ); + if ( mapper ) { + QWidget *w; + QWidgetIntDictIt it( *((QWidgetIntDict*)mapper) ); + while ( (w=it.current()) ) { + ++it; + if ( !onlyTopLevel || w->isTopLevel() ) + list->append( w ); + } + } + return list; +} + +/*! + \internal + Returns a list of all widgets. + \sa tlwList(), QApplication::allWidgets() +*/ + +QWidgetList *QWidget::wList() +{ + return wListInternal( mapper, FALSE ); +} + +/*! + \internal + Returns a list of all top level widgets. + \sa wList(), QApplication::topLevelWidgets() +*/ + +QWidgetList *QWidget::tlwList() +{ + return wListInternal( mapper, TRUE ); +} + + +void QWidget::setWinId( WId id ) // set widget identifier +{ + if ( !mapper ) // mapper destroyed + return; + if ( winid ) + mapper->remove( winid ); + winid = id; +#if defined(Q_WS_X11) + hd = id; // X11: hd == ident +#endif + if ( id ) + mapper->insert( this ); +} + + +/*! + \internal + Returns a pointer to the block of extra widget data. +*/ + +QWExtra *QWidget::extraData() +{ + return extra; +} + + +/*! + \internal + Returns a pointer to the block of extra top level widget data. + + This data is guaranteed to exist for top level widgets. +*/ + +QTLWExtra *QWidget::topData() +{ + createTLExtra(); + return extra->topextra; +} + + +void QWidget::createTLExtra() +{ + if ( !extra ) + createExtra(); + if ( !extra->topextra ) { + QTLWExtra* x = extra->topextra = new QTLWExtra; +#if defined( Q_WS_WIN ) || defined( Q_WS_MAC ) + x->opacity = 255; +#endif +#ifndef QT_NO_WIDGET_TOPEXTRA + x->icon = 0; +#endif + x->focusData = 0; + x->fleft = x->fright = x->ftop = x->fbottom = 0; + x->incw = x->inch = 0; + x->basew = x->baseh = 0; + x->normalGeometry = QRect(0,0,-1,-1); +#if defined(Q_WS_X11) + x->embedded = 0; + x->parentWinId = 0; + x->spont_unmapped = 0; + x->dnd = 0; + x->uspos = 0; + x->ussize = 0; +#endif + x->savedFlags = 0; +#if defined(Q_WS_QWS) && !defined(QT_NO_QWS_MANAGER) + x->decor_allocated_region = QRegion(); + x->qwsManager = 0; +#endif + createTLSysExtra(); + } +} + +/*! + \internal + Creates the widget extra data. +*/ + +void QWidget::createExtra() +{ + if ( !extra ) { // if not exists + extra = new QWExtra; + Q_CHECK_PTR( extra ); + extra->minw = extra->minh = 0; + extra->maxw = extra->maxh = QWIDGETSIZE_MAX; + extra->bg_pix = 0; + extra->focus_proxy = 0; +#ifndef QT_NO_CURSOR + extra->curs = 0; +#endif + extra->topextra = 0; + extra->bg_mode = PaletteBackground; + extra->bg_mode_visual = PaletteBackground; + extra->bg_origin = WidgetOrigin; +#ifndef QT_NO_STYLE + extra->style = 0; +#endif + extra->size_policy = QSizePolicy( QSizePolicy::Preferred, + QSizePolicy::Preferred ); + createSysExtra(); + } +} + + +/*! + \internal + Deletes the widget extra data. +*/ + +void QWidget::deleteExtra() +{ + if ( extra ) { // if exists + delete extra->bg_pix; +#ifndef QT_NO_CURSOR + delete extra->curs; +#endif + deleteSysExtra(); + if ( extra->topextra ) { + deleteTLSysExtra(); +#ifndef QT_NO_WIDGET_TOPEXTRA + delete extra->topextra->icon; +#endif + delete extra->topextra->focusData; +#if defined(Q_WS_QWS) && !defined(QT_NO_QWS_MANAGER) + delete extra->topextra->qwsManager; +#endif + delete extra->topextra; + } + delete extra; + // extra->xic destroyed in QWidget::destroy() + extra = 0; + } +} + + +/*! + \internal + This function is called when a widget is hidden or destroyed. + It resets some application global pointers that should only refer active, + visible widgets. +*/ + +void QWidget::deactivateWidgetCleanup() +{ + // If this was the active application window, reset it + if ( this == QApplication::active_window ) + qApp->setActiveWindow( 0 ); + // If the is the active mouse press widget, reset it +#ifdef Q_WS_MAC + extern QGuardedPtr<QWidget> qt_button_down; +#else + extern QWidget *qt_button_down; +#endif + if ( this == (QWidget *)qt_button_down ) + qt_button_down = 0; +} + + +/*! + Returns a pointer to the widget with window identifer/handle \a + id. + + The window identifier type depends on the underlying window + system, see \c qwindowdefs.h for the actual definition. If there + is no widget with this identifier, 0 is returned. +*/ + +QWidget *QWidget::find( WId id ) +{ + return mapper ? mapper->find( id ) : 0; +} + +/*! + \fn QWidgetMapper *QWidget::wmapper() + \internal + Returns a pointer to the widget mapper. + + The widget mapper is an internal dictionary that is used to map from + window identifiers/handles to widget pointers. + \sa find(), id() +*/ + +/*! + \fn WFlags QWidget::getWFlags() const + + Returns the widget flags for this this widget. + + Widget flags are a combination of \l{Qt::WidgetFlags}. + + \sa testWFlags(), setWFlags(), clearWFlags() +*/ + +/*! + \fn void QWidget::setWFlags( WFlags f ) + + Sets the widget flags \a f. + + Widget flags are a combination of \l{Qt::WidgetFlags}. + + \sa testWFlags(), getWFlags(), clearWFlags() +*/ + +/*! + \fn void QWidget::clearWFlags( WFlags f ) + + Clears the widget flags \a f. + + Widget flags are a combination of \l{Qt::WidgetFlags}. + + \sa testWFlags(), getWFlags(), setWFlags() +*/ + + + +/*! + \fn WId QWidget::winId() const + + Returns the window system identifier of the widget. + + Portable in principle, but if you use it you are probably about to + do something non-portable. Be careful. + + \sa find() +*/ + +#ifndef QT_NO_STYLE +/*! + Returns the GUI style for this widget + + \sa QWidget::setStyle(), QApplication::setStyle(), QApplication::style() +*/ + +QStyle& QWidget::style() const +{ + if ( extra && extra->style ) + return *extra->style; + QStyle &ret = qApp->style(); + return ret; +} + +/*! + Sets the widget's GUI style to \a style. Ownership of the style + object is not transferred. + + If no style is set, the widget uses the application's style, + QApplication::style() instead. + + Setting a widget's style has no effect on existing or future child + widgets. + + \warning This function is particularly useful for demonstration + purposes, where you want to show Qt's styling capabilities. Real + applications should avoid it and use one consistent GUI style + instead. + + \sa style(), QStyle, QApplication::style(), QApplication::setStyle() +*/ + +void QWidget::setStyle( QStyle *style ) +{ + QStyle& old = QWidget::style(); + createExtra(); + extra->style = style; + if ( !testWFlags(WType_Desktop) // (except desktop) + && testWState(WState_Polished)) { // (and have been polished) + old.unPolish( this ); + QWidget::style().polish( this ); + } + styleChange( old ); +} + +/*! + \overload + + Sets the widget's GUI style to \a style using the QStyleFactory. +*/ +QStyle* QWidget::setStyle( const QString &style ) +{ + QStyle *s = QStyleFactory::create( style ); + setStyle( s ); + return s; +} + +/*! + This virtual function is called when the style of the widgets + changes. \a oldStyle is the previous GUI style; you can get the + new style from style(). + + Reimplement this function if your widget needs to know when its + GUI style changes. You will almost certainly need to update the + widget using update(). + + The default implementation updates the widget including its + geometry. + + \sa QApplication::setStyle(), style(), update(), updateGeometry() +*/ + +void QWidget::styleChange( QStyle& /* oldStyle */ ) +{ + update(); + updateGeometry(); +} + +#endif + +/*! + \property QWidget::isTopLevel + \brief whether the widget is a top-level widget + + A top-level widget is a widget which usually has a frame and a + \link QWidget::caption caption (title)\endlink. \link + QWidget::isPopup() Popup\endlink and \link QWidget::isDesktop() + desktop\endlink widgets are also top-level widgets. + + A top-level widget can have a \link QWidget::parentWidget() parent + widget\endlink. It will then be grouped with its parent and deleted + when the parent is deleted, minimized when the parent is minimized + etc. If supported by the window manager, it will also have a + common taskbar entry with its parent. + + QDialog and QMainWindow widgets are by default top-level, even if + a parent widget is specified in the constructor. This behavior is + specified by the \c WType_TopLevel widget flag. + + \sa topLevelWidget(), isDialog(), isModal(), isPopup(), isDesktop(), parentWidget() +*/ + +/*! + \property QWidget::isDialog + \brief whether the widget is a dialog widget + + A dialog widget is a secondary top-level widget, i.e. a top-level + widget with a parent. + + \sa isTopLevel(), QDialog +*/ + +/*! + \property QWidget::isPopup + \brief whether the widget is a popup widget + + A popup widget is created by specifying the widget flag \c + WType_Popup to the widget constructor. A popup widget is also a + top-level widget. + + \sa isTopLevel() +*/ + +/*! + \property QWidget::isDesktop + \brief whether the widget is a desktop widget, i.e. represents the desktop + + A desktop widget is also a top-level widget. + + \sa isTopLevel(), QApplication::desktop() +*/ + +/*! + \property QWidget::isModal + \brief whether the widget is a modal widget + + This property only makes sense for top-level widgets. A modal + widget prevents widgets in all other top-level widgets from + getting any input. + + \sa isTopLevel(), isDialog(), QDialog +*/ + +/*! + \property QWidget::underMouse + \brief whether the widget is under the mouse cursor + + This value is not updated properly during drag and drop + operations. + + \sa QEvent::Enter, QEvent::Leave +*/ + +/*! + \property QWidget::minimized + \brief whether this widget is minimized (iconified) + + This property is only relevant for top-level widgets. + + \sa showMinimized(), visible, show(), hide(), showNormal(), maximized +*/ +bool QWidget::isMinimized() const +{ return testWState(WState_Minimized); } + +/*! + Shows the widget minimized, as an icon. + + Calling this function only affects \link isTopLevel() top-level + widgets\endlink. + + \sa showNormal(), showMaximized(), show(), hide(), isVisible(), + isMinimized() +*/ +void QWidget::showMinimized() +{ + bool isMin = isMinimized(); + if (isMin && isVisible()) return; + + if (!isMin) + setWindowState((windowState() & ~WindowActive) | WindowMinimized); + show(); + if (!isTopLevel()) + QApplication::sendPostedEvents(this, QEvent::ShowMinimized); +} + +/*! + \property QWidget::maximized + \brief whether this widget is maximized + + This property is only relevant for top-level widgets. + + Note that due to limitations in some window-systems, this does not + always report the expected results (e.g. if the user on X11 + maximizes the window via the window manager, Qt has no way of + distinguishing this from any other resize). This is expected to + improve as window manager protocols evolve. + + \sa windowState(), showMaximized(), visible, show(), hide(), showNormal(), minimized +*/ +bool QWidget::isMaximized() const +{ return testWState(WState_Maximized); } + + + +/*! Returns the current window state. The window state is a OR'ed + combination of Qt::WindowState: \c WindowMinimized, \c + WindowMaximized, \c WindowFullScreen and \c WindowActive. + + \sa Qt::WindowState setWindowState() + */ +uint QWidget::windowState() const +{ + uint state = 0; + if (testWState(WState_Minimized)) + state |= WindowMinimized; + if (testWState(WState_Maximized)) + state |= WindowMaximized; + if (testWState(WState_FullScreen)) + state |= WindowFullScreen; + if (isActiveWindow()) + state |= WindowActive; + return state; +} + +/*! + \fn void QWidget::setWindowState(uint windowState) + + Sets the window state to \a windowState. The window state is a OR'ed + combination of Qt::WindowState: \c WindowMinimized, \c + WindowMaximized, \c WindowFullScreen and \c WindowActive. + + If the window is not visible (i.e. isVisible() returns FALSE), the + window state will take effect when show() is called. For visible + windows, the change is immediate. For example, to toggle between + full-screen and mormal mode, use the following code: + + \code + w->setWindowState(w->windowState() ^ WindowFullScreen); + \endcode + + In order to restore and activate a minimized window (while + preserving its maximized and/or full-screen state), use the following: + + \code + w->setWindowState(w->windowState() & ~WindowMinimized | WindowActive); + \endcode + + Note: On some window systems \c WindowActive is not immediate, and may be + ignored in certain cases. + + \sa Qt::WindowState windowState() +*/ + +/*! + \property QWidget::fullScreen + \brief whether the widget is full screen + + \sa windowState(), minimized, maximized +*/ +bool QWidget::isFullScreen() const +{ return testWState(WState_FullScreen); } + +/*! + Shows the widget in full-screen mode. + + Calling this function only affects top-level widgets. + + To return from full-screen mode, call showNormal(). + + Full-screen mode works fine under Windows, but has certain + problems under X. These problems are due to limitations of the + ICCCM protocol that specifies the communication between X11 + clients and the window manager. ICCCM simply does not understand + the concept of non-decorated full-screen windows. Therefore, the + best we can do is to request a borderless window and place and + resize it to fill the entire screen. Depending on the window + manager, this may or may not work. The borderless window is + requested using MOTIF hints, which are at least partially + supported by virtually all modern window managers. + + An alternative would be to bypass the window manager entirely and + create a window with the WX11BypassWM flag. This has other severe + problems though, like totally broken keyboard focus and very + strange effects on desktop changes or when the user raises other + windows. + + X11 window managers that follow modern post-ICCCM specifications + support full-screen mode properly. + + \sa showNormal(), showMaximized(), show(), hide(), isVisible() +*/ +void QWidget::showFullScreen() +{ + bool isFull = isFullScreen(); + if (isFull && isVisible()) + return; + + if (!isFull) + setWindowState(windowState() | WindowFullScreen); + show(); + if (!isTopLevel()) + QApplication::sendPostedEvents(this, QEvent::ShowFullScreen); + setActiveWindow(); +} + +/*! + Shows the widget maximized. + + Calling this function only affects \link isTopLevel() top-level + widgets\endlink. + + On X11, this function may not work properly with certain window + managers. See the \link geometry.html Window Geometry + documentation\endlink for an explanation. + + \sa setWindowState(), showNormal(), showMinimized(), show(), hide(), isVisible() +*/ +void QWidget::showMaximized() +{ + if (isMaximized() && isVisible() && !isMinimized()) + return; + + setWindowState((windowState() & ~WindowMinimized) | WindowMaximized); + show(); + if (!isTopLevel()) + QApplication::sendPostedEvents(this, QEvent::ShowMaximized); +} + +/*! + Restores the widget after it has been maximized or minimized. + + Calling this function only affects \link isTopLevel() top-level + widgets\endlink. + + \sa setWindowState(), showMinimized(), showMaximized(), show(), hide(), isVisible() +*/ +void QWidget::showNormal() +{ + setWindowState(WindowNoState); + show(); + if (!isTopLevel()) + QApplication::sendPostedEvents(this, QEvent::ShowNormal); +} + +/*! + Returns TRUE if this widget would become enabled if \a ancestor is + enabled; otherwise returns FALSE. + + This is the case if neither the widget itself nor every parent up + to but excluding \a ancestor has been explicitly disabled. + + isEnabledTo(0) is equivalent to isEnabled(). + + \sa setEnabled() enabled +*/ + +bool QWidget::isEnabledTo( QWidget* ancestor ) const +{ + const QWidget * w = this; + while ( w && !w->testWState(WState_ForceDisabled) + && !w->isTopLevel() + && w->parentWidget() + && w->parentWidget() != ancestor ) + w = w->parentWidget(); + return !w->testWState( WState_ForceDisabled ); +} + + +/*! + \fn bool QWidget::isEnabledToTLW() const + \obsolete + + This function is deprecated. It is equivalent to isEnabled() +*/ + +/*! + \property QWidget::enabled + \brief whether the widget is enabled + + An enabled widget receives keyboard and mouse events; a disabled + widget does not. In fact, an enabled widget only receives keyboard + events when it is in focus. + + Some widgets display themselves differently when they are + disabled. For example a button might draw its label grayed out. If + your widget needs to know when it becomes enabled or disabled, you + can reimplement the enabledChange() function. + + Disabling a widget implicitly disables all its children. Enabling + respectively enables all child widgets unless they have been + explicitly disabled. + + \sa isEnabled(), isEnabledTo(), QKeyEvent, QMouseEvent, enabledChange() +*/ +void QWidget::setEnabled( bool enable ) +{ + if ( enable ) + clearWState( WState_ForceDisabled ); + else + setWState( WState_ForceDisabled ); + + if ( !isTopLevel() && parentWidget() && + !parentWidget()->isEnabled() && enable ) + return; // nothing we can do + + if ( enable ) { + if ( testWState(WState_Disabled) ) { + clearWState( WState_Disabled ); + setBackgroundFromMode(); + enabledChange( !enable ); + if ( children() ) { + QObjectListIt it( *children() ); + QWidget *w; + while( (w = (QWidget *)it.current()) != 0 ) { + ++it; + if ( w->isWidgetType() && + !w->testWState( WState_ForceDisabled ) ) + w->setEnabled( TRUE ); + } + } + } + } else { + if ( !testWState(WState_Disabled) ) { + if (focusWidget() == this) { + bool parentIsEnabled = (!parentWidget() || parentWidget()->isEnabled()); + if (!parentIsEnabled || !focusNextPrevChild(TRUE)) + clearFocus(); + } + setWState( WState_Disabled ); + setBackgroundFromMode(); + enabledChange( !enable ); + if ( children() ) { + QObjectListIt it( *children() ); + QWidget *w; + while( (w = (QWidget *)it.current()) != 0 ) { + ++it; + if ( w->isWidgetType() && w->isEnabled() ) { + w->setEnabled( FALSE ); + w->clearWState( WState_ForceDisabled ); + } + } + } + } + } +#if defined(Q_WS_X11) + if ( testWState( WState_OwnCursor ) ) { + // enforce the windows behavior of clearing the cursor on + // disabled widgets + + extern void qt_x11_enforce_cursor( QWidget * w ); // defined in qwidget_x11.cpp + qt_x11_enforce_cursor( this ); + } +#endif +#ifdef Q_WS_WIN + QInputContext::enable( this, im_enabled & !((bool)testWState(WState_Disabled)) ); +#endif +} + +/*! + Disables widget input events if \a disable is TRUE; otherwise + enables input events. + + See the \l enabled documentation for more information. + + \sa isEnabledTo(), QKeyEvent, QMouseEvent, enabledChange() +*/ +void QWidget::setDisabled( bool disable ) +{ + setEnabled( !disable ); +} + +/*! + \fn void QWidget::enabledChange( bool oldEnabled ) + + This virtual function is called from setEnabled(). \a oldEnabled + is the previous setting; you can get the new setting from + isEnabled(). + + Reimplement this function if your widget needs to know when it + becomes enabled or disabled. You will almost certainly need to + update the widget using update(). + + The default implementation repaints the visible part of the + widget. + + \sa setEnabled(), isEnabled(), repaint(), update(), clipRegion() +*/ + +void QWidget::enabledChange( bool ) +{ + update(); +#if defined(QT_ACCESSIBILITY_SUPPORT) + QAccessible::updateAccessibility( this, 0, QAccessible::StateChanged ); +#endif +} + +/*! + \fn void QWidget::windowActivationChange( bool oldActive ) + + This virtual function is called for a widget when its window is + activated or deactivated by the window system. \a oldActive is the + previous state; you can get the new setting from isActiveWindow(). + + Reimplement this function if your widget needs to know when its + window becomes activated or deactivated. + + The default implementation updates the visible part of the widget + if the inactive and the active colorgroup are different for colors + other than the highlight and link colors. + + \sa setActiveWindow(), isActiveWindow(), update(), palette() +*/ + +void QWidget::windowActivationChange( bool ) +{ +#ifndef QT_NO_PALETTE + if ( !isVisible() ) + return; + + const QColorGroup &acg = palette().active(); + const QColorGroup &icg = palette().inactive(); + + if ( acg != icg ) { + BackgroundMode bm = backgroundMode(); + QColorGroup::ColorRole role = QPalette::backgroundRoleFromMode(bm); + if ( bm > NoBackground && acg.brush(role) != icg.brush(role) ) + setBackgroundFromMode(); + else if ( acg.background() == icg.background() && + acg.base() == icg.base() && + acg.text() == icg.text() && + acg.foreground() == icg.foreground() && + acg.button() == icg.button() && + acg.buttonText() == icg.buttonText() && + acg.brightText() == icg.brightText() && + acg.dark() == icg.dark() && + acg.light() == icg.light() && + acg.mid() == icg.mid() && + acg.midlight() == icg.midlight() && + acg.shadow() == icg.shadow() ) + return; + update(); + } +#endif +} + +/*! + \property QWidget::frameGeometry + \brief geometry of the widget relative to its parent including any + window frame + + See the \link geometry.html Window Geometry documentation\endlink + for an overview of geometry issues with top-level widgets. + + \sa geometry() x() y() pos() +*/ +QRect QWidget::frameGeometry() const +{ + if (isTopLevel() && ! isPopup()) { + if (fstrut_dirty) + updateFrameStrut(); + QWidget *that = (QWidget *) this; + QTLWExtra *top = that->topData(); + return QRect(crect.x() - top->fleft, + crect.y() - top->ftop, + crect.width() + top->fleft + top->fright, + crect.height() + top->ftop + top->fbottom); + } + return crect; +} + +/*! \property QWidget::x + \brief the x coordinate of the widget relative to its parent including + any window frame + + See the \link geometry.html Window Geometry documentation\endlink + for an overview of top-level widget geometry. + + \sa frameGeometry, y, pos +*/ +int QWidget::x() const +{ + if (isTopLevel() && ! isPopup()) { + if (fstrut_dirty) + updateFrameStrut(); + QWidget *that = (QWidget *) this; + return crect.x() - that->topData()->fleft; + } + return crect.x(); +} + +/*! + \property QWidget::y + \brief the y coordinate of the widget relative to its parent and + including any window frame + + See the \link geometry.html Window Geometry documentation\endlink + for an overview of top-level widget geometry. + + \sa frameGeometry, x, pos +*/ +int QWidget::y() const +{ + if (isTopLevel() && ! isPopup()) { + if (fstrut_dirty) + updateFrameStrut(); + QWidget *that = (QWidget *) this; + return crect.y() - that->topData()->ftop; + } + return crect.y(); +} + +/*! + \property QWidget::pos + \brief the position of the widget within its parent widget + + If the widget is a top-level widget, the position is that of the + widget on the desktop, including its frame. + + When changing the position, the widget, if visible, receives a + move event (moveEvent()) immediately. If the widget is not + currently visible, it is guaranteed to receive an event before it + is shown. + + move() is virtual, and all other overloaded move() implementations + in Qt call it. + + \warning Calling move() or setGeometry() inside moveEvent() can + lead to infinite recursion. + + See the \link geometry.html Window Geometry documentation\endlink + for an overview of top-level widget geometry. + + \sa frameGeometry, size x(), y() +*/ +QPoint QWidget::pos() const +{ + if (isTopLevel() && ! isPopup()) { + if (fstrut_dirty) + updateFrameStrut(); + QWidget *that = (QWidget *) this; + QTLWExtra *top = that->topData(); + return QPoint(crect.x() - top->fleft, crect.y() - top->ftop); + } + return crect.topLeft(); +} + +/*! + \property QWidget::geometry + \brief the geometry of the widget relative to its parent and + excluding the window frame + + When changing the geometry, the widget, if visible, receives a + move event (moveEvent()) and/or a resize event (resizeEvent()) + immediately. If the widget is not currently visible, it is + guaranteed to receive appropriate events before it is shown. + + The size component is adjusted if it lies outside the range + defined by minimumSize() and maximumSize(). + + setGeometry() is virtual, and all other overloaded setGeometry() + implementations in Qt call it. + + \warning Calling setGeometry() inside resizeEvent() or moveEvent() + can lead to infinite recursion. + + See the \link geometry.html Window Geometry documentation\endlink + for an overview of top-level widget geometry. + + \sa frameGeometry(), rect(), move(), resize(), moveEvent(), + resizeEvent(), minimumSize(), maximumSize() +*/ + +/*! + \property QWidget::size + \brief the size of the widget excluding any window frame + + When resizing, the widget, if visible, receives a resize event + (resizeEvent()) immediately. If the widget is not currently + visible, it is guaranteed to receive an event before it is shown. + + The size is adjusted if it lies outside the range defined by + minimumSize() and maximumSize(). Furthermore, the size is always + at least QSize(1, 1). For toplevel widgets, the minimum size + might be larger, depending on the window manager. + + If you want a top-level window to have a fixed size, call + setResizeMode( QLayout::FreeResize ) on its layout. + + resize() is virtual, and all other overloaded resize() + implementations in Qt call it. + + \warning Calling resize() or setGeometry() inside resizeEvent() can + lead to infinite recursion. + + \sa pos, geometry, minimumSize, maximumSize, resizeEvent() +*/ + +/*! + \property QWidget::width + \brief the width of the widget excluding any window frame + + See the \link geometry.html Window Geometry documentation\endlink + for an overview of top-level widget geometry. + + \sa geometry, height, size +*/ + +/*! + \property QWidget::height + \brief the height of the widget excluding any window frame + + See the \link geometry.html Window Geometry documentation\endlink + for an overview of top-level widget geometry. + + \sa geometry, width, size +*/ + +/*! + \property QWidget::rect + \brief the internal geometry of the widget excluding any window + frame + + The rect property equals QRect(0, 0, width(), height()). + + See the \link geometry.html Window Geometry documentation\endlink + for an overview of top-level widget geometry. + + \sa size +*/ + +/*! + \property QWidget::childrenRect + \brief the bounding rectangle of the widget's children + + Hidden children are excluded. + + \sa childrenRegion() geometry() +*/ + +QRect QWidget::childrenRect() const +{ + QRect r( 0, 0, 0, 0 ); + if ( !children() ) + return r; + QObjectListIt it( *children() ); + QObject *obj; + while ( (obj = it.current()) ) { + ++it; + if ( obj->isWidgetType() && !((QWidget*)obj)->isHidden() && !((QWidget*)obj)->isTopLevel()) + r = r.unite( ((QWidget*)obj)->geometry() ); + } + return r; +} + +/*! + \property QWidget::childrenRegion + \brief the combined region occupied by the widget's children + + Hidden children are excluded. + + \sa childrenRect() geometry() +*/ + +QRegion QWidget::childrenRegion() const +{ + QRegion r; + if ( !children() ) + return r; + QObjectListIt it( *children() ); // iterate over all children + QObject *obj; + while ( (obj=it.current()) ) { + ++it; + if ( obj->isWidgetType() && !((QWidget*)obj)->isHidden() && !((QWidget*)obj)->isTopLevel()) + r = r.unite( ((QWidget*)obj)->geometry() ); + } + return r; +} + + +/*! + \property QWidget::minimumSize + \brief the widget's minimum size + + The widget cannot be resized to a smaller size than the minimum + widget size. The widget's size is forced to the minimum size if + the current size is smaller. + + If you use a layout inside the widget, the minimum size will be + set by the layout and not by setMinimumSize(), unless you set the + layout's resize mode to QLayout::FreeResize. + + \sa minimumWidth, minimumHeight, maximumSize, sizeIncrement + QLayout::setResizeMode() +*/ + +QSize QWidget::minimumSize() const +{ + return extra ? QSize( extra->minw, extra->minh ) : QSize( 0, 0 ); +} + +/*! + \property QWidget::maximumSize + \brief the widget's maximum size + + The widget cannot be resized to a larger size than the maximum + widget size. + + \sa maximumWidth(), maximumHeight(), setMaximumSize(), + minimumSize(), sizeIncrement() +*/ + +QSize QWidget::maximumSize() const +{ + return extra ? QSize( extra->maxw, extra->maxh ) + : QSize( QWIDGETSIZE_MAX, QWIDGETSIZE_MAX ); +} + + +/*! + \property QWidget::minimumWidth + \brief the widget's minimum width + + This property corresponds to minimumSize().width(). + + \sa minimumSize, minimumHeight +*/ + +/*! + \property QWidget::minimumHeight + \brief the widget's minimum height + + This property corresponds to minimumSize().height(). + + \sa minimumSize, minimumWidth +*/ + +/*! + \property QWidget::maximumWidth + \brief the widget's maximum width + + This property corresponds to maximumSize().width(). + + \sa maximumSize, maximumHeight +*/ + +/*! + \property QWidget::maximumHeight + \brief the widget's maximum height + + This property corresponds to maximumSize().height(). + + \sa maximumSize, maximumWidth +*/ + +/*! + \property QWidget::sizeIncrement + \brief the size increment of the widget + + When the user resizes the window, the size will move in steps of + sizeIncrement().width() pixels horizontally and + sizeIncrement.height() pixels vertically, with baseSize() as the + basis. Preferred widget sizes are for non-negative integers \e i + and \e j: + \code + width = baseSize().width() + i * sizeIncrement().width(); + height = baseSize().height() + j * sizeIncrement().height(); + \endcode + + Note that while you can set the size increment for all widgets, it + only affects top-level widgets. + + \warning The size increment has no effect under Windows, and may + be disregarded by the window manager on X. + + \sa size, minimumSize, maximumSize +*/ +QSize QWidget::sizeIncrement() const +{ + return ( extra && extra->topextra ) + ? QSize( extra->topextra->incw, extra->topextra->inch ) + : QSize( 0, 0 ); +} + +/*! + \property QWidget::baseSize + \brief the base size of the widget + + The base size is used to calculate a proper widget size if the + widget defines sizeIncrement(). + + \sa setSizeIncrement() +*/ + +QSize QWidget::baseSize() const +{ + return ( extra != 0 && extra->topextra != 0 ) + ? QSize( extra->topextra->basew, extra->topextra->baseh ) + : QSize( 0, 0 ); +} + +/*! + Sets both the minimum and maximum sizes of the widget to \a s, + thereby preventing it from ever growing or shrinking. + + \sa setMaximumSize() setMinimumSize() +*/ + +void QWidget::setFixedSize( const QSize & s) +{ + setMinimumSize( s ); + setMaximumSize( s ); + resize( s ); +} + + +/*! + \overload void QWidget::setFixedSize( int w, int h ) + + Sets the width of the widget to \a w and the height to \a h. +*/ + +void QWidget::setFixedSize( int w, int h ) +{ + setMinimumSize( w, h ); + setMaximumSize( w, h ); + resize( w, h ); +} + +void QWidget::setMinimumWidth( int w ) +{ + setMinimumSize( w, minimumSize().height() ); +} + +void QWidget::setMinimumHeight( int h ) +{ + setMinimumSize( minimumSize().width(), h ); +} + +void QWidget::setMaximumWidth( int w ) +{ + setMaximumSize( w, maximumSize().height() ); +} + +void QWidget::setMaximumHeight( int h ) +{ + setMaximumSize( maximumSize().width(), h ); +} + +/*! + Sets both the minimum and maximum width of the widget to \a w + without changing the heights. Provided for convenience. + + \sa sizeHint() minimumSize() maximumSize() setFixedSize() +*/ + +void QWidget::setFixedWidth( int w ) +{ + setMinimumSize( w, minimumSize().height() ); + setMaximumSize( w, maximumSize().height() ); +} + + +/*! + Sets both the minimum and maximum heights of the widget to \a h + without changing the widths. Provided for convenience. + + \sa sizeHint() minimumSize() maximumSize() setFixedSize() +*/ + +void QWidget::setFixedHeight( int h ) +{ + setMinimumSize( minimumSize().width(), h ); + setMaximumSize( maximumSize().width(), h ); +} + + +/*! + Translates the widget coordinate \a pos to the coordinate system + of \a parent. The \a parent must not be 0 and must be a parent + of the calling widget. + + \sa mapFrom() mapToParent() mapToGlobal() hasMouse() +*/ + +QPoint QWidget::mapTo( QWidget * parent, const QPoint & pos ) const +{ + QPoint p = pos; + if ( parent ) { + const QWidget * w = this; + while ( w != parent ) { + p = w->mapToParent( p ); + w = w->parentWidget(); + } + } + return p; +} + + +/*! + Translates the widget coordinate \a pos from the coordinate system + of \a parent to this widget's coordinate system. The \a parent + must not be 0 and must be a parent of the calling widget. + + \sa mapTo() mapFromParent() mapFromGlobal() hasMouse() +*/ + +QPoint QWidget::mapFrom( QWidget * parent, const QPoint & pos ) const +{ + QPoint p( pos ); + if ( parent ) { + const QWidget * w = this; + while ( w != parent ) { + p = w->mapFromParent( p ); + w = w->parentWidget(); + } + } + return p; +} + + +/*! + Translates the widget coordinate \a pos to a coordinate in the + parent widget. + + Same as mapToGlobal() if the widget has no parent. + + \sa mapFromParent() mapTo() mapToGlobal() hasMouse() +*/ + +QPoint QWidget::mapToParent( const QPoint &pos ) const +{ + return pos + crect.topLeft(); +} + +/*! + Translates the parent widget coordinate \a pos to widget + coordinates. + + Same as mapFromGlobal() if the widget has no parent. + + \sa mapToParent() mapFrom() mapFromGlobal() hasMouse() +*/ + +QPoint QWidget::mapFromParent( const QPoint &pos ) const +{ + return pos - crect.topLeft(); +} + + +/*! + Returns the top-level widget for this widget, i.e. the next + ancestor widget that has (or could have) a window-system frame. + + If the widget is a top-level, the widget itself is returned. + + Typical usage is changing the window caption: + + \code + aWidget->topLevelWidget()->setCaption( "New Caption" ); + \endcode + + \sa isTopLevel() +*/ + +QWidget *QWidget::topLevelWidget() const +{ + QWidget *w = (QWidget *)this; + QWidget *p = w->parentWidget(); + while ( !w->testWFlags(WType_TopLevel) && p ) { + w = p; + p = p->parentWidget(); + } + return w; +} + + +/*! + \property QWidget::paletteForegroundColor + \brief the foreground color of the widget + + setPaletteForegroundColor() is a convenience function that creates + and sets a modified QPalette with setPalette(). The palette is + modified according to the widget's \e {background mode}. For + example, if the background mode is \c PaletteButton the palette entry + \c QColorGroup::ButtonText is set to color. + + \sa setPalette() QApplication::setPalette() backgroundMode() + foregroundColor() setBackgroundMode() setEraseColor() +*/ +const QColor &QWidget::paletteForegroundColor() const +{ +#ifndef QT_NO_PALETTE + BackgroundMode mode = extra ? (BackgroundMode) extra->bg_mode_visual : PaletteBackground; + return colorGroup().color( QPalette::foregroundRoleFromMode(mode) ); +#else + return Qt::black; +#endif +} + +void QWidget::setPaletteForegroundColor( const QColor & color ) +{ +#ifndef QT_NO_PALETTE + BackgroundMode mode = extra ? (BackgroundMode) extra->bg_mode_visual : PaletteBackground; + QPalette pal = palette(); + QColorGroup::ColorRole role = QPalette::foregroundRoleFromMode( mode ); + pal.setColor( QPalette::Active, role, color ); + pal.setColor( QPalette::Inactive, role, color ); + pal.setColor( QPalette::Disabled, role, color ); + setPalette( pal ); +#endif +} + + +/*! + Same as paletteForegroundColor() + */ +const QColor &QWidget::foregroundColor() const +{ + return paletteForegroundColor(); +} + + +/*! + \fn const QColor& QWidget::eraseColor() const + + Returns the erase color of the widget. + + \sa setEraseColor() setErasePixmap() backgroundColor() +*/ + +/*! + Sets the erase color of the widget to \a color. + + The erase color is the color the widget is to be cleared to before + paintEvent() is called. If there is an erase pixmap (set using + setErasePixmap()), then this property has an indeterminate value. + + \sa erasePixmap(), backgroundColor(), backgroundMode(), palette() +*/ +void QWidget::setEraseColor( const QColor & color ) +{ + setBackgroundModeDirect( FixedColor ); + setBackgroundColorDirect( color ); + update(); +} + +/*! + Returns the widget's erase pixmap. + + \sa setErasePixmap() eraseColor() +*/ +const QPixmap *QWidget::erasePixmap() const +{ + return ( extra && extra->bg_pix ) ? extra->bg_pix : 0; +} + +/*! + Sets the widget's erase pixmap to \a pixmap. + + This pixmap is used to clear the widget before paintEvent() is + called. +*/ +void QWidget::setErasePixmap( const QPixmap &pixmap ) +{ + // This function is called with a null pixmap by setBackgroundEmpty(). + setBackgroundPixmapDirect( pixmap ); + setBackgroundModeDirect( FixedPixmap ); + update(); +} + +void QWidget::setBackgroundFromMode() +{ +#ifndef QT_NO_PALETTE + QColorGroup::ColorRole r = QColorGroup::Background; + if ( extra ) { + int i = (BackgroundMode)extra->bg_mode; + if ( i == FixedColor || i == FixedPixmap || i == NoBackground ) { + // Mode is for fixed color, not one based on palette, + // so nothing to do. + return; + } + switch( i ) { + case PaletteForeground: + r = QColorGroup::Foreground; + break; + case PaletteButton: + r = QColorGroup::Button; + break; + case PaletteLight: + r = QColorGroup::Light; + break; + case PaletteMidlight: + r = QColorGroup::Midlight; + break; + case PaletteDark: + r = QColorGroup::Dark; + break; + case PaletteMid: + r = QColorGroup::Mid; + break; + case PaletteText: + r = QColorGroup::Text; + break; + case PaletteBrightText: + r = QColorGroup::BrightText; + break; + case PaletteBase: + r = QColorGroup::Base; + break; + case PaletteBackground: + r = QColorGroup::Background; + break; + case PaletteShadow: + r = QColorGroup::Shadow; + break; + case PaletteHighlight: + r = QColorGroup::Highlight; + break; + case PaletteHighlightedText: + r = QColorGroup::HighlightedText; + break; + case PaletteButtonText: + r = QColorGroup::ButtonText; + break; + case X11ParentRelative: +#if defined(Q_WS_X11) + setBackgroundX11Relative(); +#endif + return; + } + } + const QColorGroup &cg = colorGroup(); + QPixmap * p = cg.brush( r ).pixmap(); + if ( p ) + setBackgroundPixmapDirect( *p ); + else + setBackgroundColorDirect( cg.color( r ) ); +#endif +} + +/*! + \enum Qt::BackgroundMode + + This enum describes how the background of a widget changes, as the + widget's palette changes. + + The background is what the widget contains when \link + QWidget::paintEvent() paintEvent()\endlink is called. To minimize + flicker, this should be the most common color or pixmap in the + widget. For \c PaletteBackground, use colorGroup().brush( \c + QColorGroup::Background ), and so on. + + \value PaletteForeground + \value PaletteBackground + \value PaletteButton + \value PaletteLight + \value PaletteMidlight + \value PaletteDark + \value PaletteMid + \value PaletteText + \value PaletteBrightText + \value PaletteButtonText + \value PaletteBase + \value PaletteShadow + \value PaletteHighlight + \value PaletteHighlightedText + \value PaletteLink + \value PaletteLinkVisited + \value X11ParentRelative (internal use only) + + The final three values have special meaning: + + \value NoBackground the widget is not cleared before paintEvent(). + If the widget's paint event always draws on all the pixels, using + this mode can be both fast and flicker-free. + \value FixedColor the widget is cleared to a fixed color, normally + different from all the ones in the palette(). Set using \link + QWidget::setPaletteBackgroundColor() + setPaletteBackgroundColor()\endlink. + \value FixedPixmap the widget is cleared to a fixed pixmap, + normally different from all the ones in the palette(). Set using + \link QWidget::setPaletteBackgroundPixmap() + setPaletteBackgroundPixmap()\endlink. + + Although \c FixedColor and \c FixedPixmap are sometimes just + right, if you use them, make sure that you test your application + when the desktop color scheme has been changed. (On X11, a quick + way to test this is e.g. "./myapp -bg paleblue". On Windows, you + must use the control panel.) + + \sa QWidget::setBackgroundMode() QWidget::backgroundMode() + QWidget::setBackgroundPixmap() QWidget::setPaletteBackgroundColor() +*/ + +/*! + \property QWidget::backgroundMode + \brief the color role used for painting the background of the widget + + setPaletteBackgroundColor() reads this property to determine which + entry of the \link QWidget::palette palette\endlink to set. + + For most widgets the default suffices (\c PaletteBackground, + typically gray), but some need to use \c PaletteBase (the + background color for text output, typically white) or another + role. + + QListBox, which is "sunken" and uses the base color to contrast + with its environment, does this in its constructor: + + \code + setBackgroundMode( PaletteBase ); + \endcode + + You will never need to set the background mode of a built-in + widget in Qt, but you might consider setting it in your custom + widgets, so that setPaletteBackgroundColor() works as expected. + + Note that two of the BackgroundMode values make no sense for + setBackgroundMode(), namely \c FixedPixmap and \c FixedColor. You + must call setBackgroundPixmap() and setPaletteBackgroundColor() + instead. +*/ +Qt::BackgroundMode QWidget::backgroundMode() const +{ + return extra ? (BackgroundMode) extra->bg_mode : PaletteBackground; +} + +void QWidget::setBackgroundMode( BackgroundMode m ) +{ + setBackgroundMode( m, m ); + if ( (widget_state & (WState_Visible|WState_BlockUpdates)) == + WState_Visible ) + update(); +} + + +/*! + \overload + + Sets the widget's own background mode to \a m and the visual + background mode to \a visual. The visual background mode is used + with the designable properties \c backgroundColor, \c + foregroundColor and \c backgroundPixmap. + + For complex controls, the logical background mode sometimes + differs from a widget's own background mode. A spinbox for example + has \c PaletteBackground as background mode (typically dark gray), + while it's embedded lineedit control uses \c PaletteBase + (typically white). Since the lineedit covers most of the visual + area of a spinbox, it defines \c PaletteBase to be its \a visual + background mode. Changing the \c backgroundColor property thus + changes the lineedit control's background, which is exactly what + the user expects in \e{Qt Designer}. +*/ +void QWidget::setBackgroundMode( BackgroundMode m, BackgroundMode visual ) +{ + if ( m == NoBackground ) { + setBackgroundEmpty(); + } else if ( m == FixedColor || m == FixedPixmap ) { +#if defined(QT_DEBUG) + qWarning( "QWidget::setBackgroundMode: FixedColor or FixedPixmap makes" + " no sense" ); +#endif + return; + } + setBackgroundModeDirect(m); + if ( m != visual && !extra ) + createExtra(); + if ( extra ) + extra->bg_mode_visual = visual; +} + + +/*! + \internal +*/ +void QWidget::setBackgroundModeDirect( BackgroundMode m ) +{ + if ( m == PaletteBackground && !extra ) + return; + + createExtra(); + if ( (BackgroundMode)extra->bg_mode != m ) { + extra->bg_mode = m; + extra->bg_mode_visual = m; + setBackgroundFromMode(); + } +} + +/*! + \property QWidget::paletteBackgroundColor + \brief the background color of the widget + + The palette background color is usually set implicitly by + setBackgroundMode(), although it can also be set explicitly by + setPaletteBackgroundColor(). setPaletteBackgroundColor() is a + convenience function that creates and sets a modified QPalette + with setPalette(). The palette is modified according to the + widget's background mode. For example, if the background mode is + \c PaletteButton the color used for the palette's \c + QColorGroup::Button color entry is set. + + If there is a background pixmap (set using + setPaletteBackgroundPixmap()), then the return value of this + function is indeterminate. + + \sa paletteBackgroundPixmap, paletteForegroundColor, palette, colorGroup() +*/ +const QColor & QWidget::paletteBackgroundColor() const +{ +#ifndef QT_NO_PALETTE + BackgroundMode mode = extra ? (BackgroundMode) extra->bg_mode_visual : PaletteBackground; + switch( mode ) { + case FixedColor: + case FixedPixmap : + case NoBackground: + case X11ParentRelative: + return eraseColor(); + default: + QColorGroup::ColorRole role = QPalette::backgroundRoleFromMode( mode ); + return colorGroup().color( role ); + } +#else + return eraseColor(); +#endif +} + +void QWidget::setPaletteBackgroundColor( const QColor &color ) +{ +#ifndef QT_NO_PALETTE + BackgroundMode mode = extra ? (BackgroundMode) extra->bg_mode_visual : PaletteBackground; + switch( mode ) { + case FixedColor: + case FixedPixmap : + case NoBackground: + case X11ParentRelative: + setEraseColor( color ); + break; + default: + QPalette pal = palette(); + QColorGroup::ColorRole role = QPalette::backgroundRoleFromMode( mode ); + pal.setColor( QPalette::Active, role, color ); + pal.setColor( QPalette::Inactive, role, color ); + pal.setColor( QPalette::Disabled, role, color ); + setPalette( pal ); + break; + } +#else + setEraseColor( color ); +#endif +} + + +/*! + \property QWidget::paletteBackgroundPixmap + \brief the background pixmap of the widget + + The palette background pixmap is usually set implicitly by + setBackgroundMode(), although it can also be set explicitly by + setPaletteBackgroundPixmap(). setPaletteBackgroundPixmap() is a + convenience function that creates and sets a modified QPalette + with setPalette(). The palette is modified according to the + widget's background mode. For example, if the background mode is + \c PaletteButton the pixmap used for the palette's + \c QColorGroup::Button color entry is set. + + If there is a plain background color (set using + setPaletteBackgroundColor()), then this function returns 0. + + \sa paletteBackgroundColor, paletteForegroundColor, palette, colorGroup() +*/ +const QPixmap *QWidget::paletteBackgroundPixmap() const +{ +#ifndef QT_NO_PALETTE + BackgroundMode mode = extra ? (BackgroundMode) extra->bg_mode_visual : PaletteBackground; + switch( mode ) { + case FixedColor: + case FixedPixmap : + case NoBackground: + case X11ParentRelative: + return erasePixmap(); + default: + QColorGroup::ColorRole role = QPalette::backgroundRoleFromMode( mode ); + return palette().brush( QPalette::Active, role ).pixmap(); + } +#else + return erasePixmap(); +#endif +} + +void QWidget::setPaletteBackgroundPixmap( const QPixmap &pixmap ) +{ +#ifndef QT_NO_PALETTE + BackgroundMode mode = extra ? (BackgroundMode) extra->bg_mode_visual : PaletteBackground; + switch( mode ) { + case FixedColor: + case FixedPixmap : + case NoBackground: + case X11ParentRelative: + setErasePixmap( pixmap ); + break; + default: + QPalette pal = palette(); + QColorGroup::ColorRole role = QPalette::backgroundRoleFromMode( mode ); + pal.setBrush( QPalette::Active, role, QBrush( pal.color( QPalette::Active, role ), pixmap ) ); + pal.setBrush( QPalette::Inactive, role, QBrush( pal.color( QPalette::Inactive, role ), pixmap ) ); + pal.setBrush( QPalette::Disabled, role, QBrush( pal.color( QPalette::Disabled, role ), pixmap ) ); + setPalette( pal ); + break; + } +#else + setErasePixmap( pixmap ); +#endif +} + + +/*! + \property QWidget::backgroundBrush + \brief the widget's background brush + + The background brush depends on a widget's palette and its + background mode. + + \sa backgroundColor(), backgroundPixmap(), eraseColor(), palette, + QApplication::setPalette() +*/ +const QBrush& QWidget::backgroundBrush() const +{ + static QBrush noBrush; +#ifndef QT_NO_PALETTE + BackgroundMode mode = extra ? (BackgroundMode) extra->bg_mode_visual : PaletteBackground; + switch( mode ) { + case FixedColor: + case FixedPixmap : + case NoBackground: + case X11ParentRelative: + return noBrush; + default: + QColorGroup::ColorRole role = QPalette::backgroundRoleFromMode( mode ); + return colorGroup().brush( role ); + } +#else + return noBrush; +#endif +} + + +/*! + \property QWidget::colorGroup + \brief the current color group of the widget palette + + The color group is determined by the state of the widget. A + disabled widget has the QPalette::disabled() color group, a widget + with keyboard focus has the QPalette::active() color group, and an + inactive widget has the QPalette::inactive() color group. + + \sa palette +*/ +#ifndef QT_NO_PALETTE +const QColorGroup &QWidget::colorGroup() const +{ + if ( !isEnabled() ) + return palette().disabled(); + else if ( !isVisible() || isActiveWindow() ) + return palette().active(); + else + return palette().inactive(); +} +#endif + +/*! + \property QWidget::palette + \brief the widget's palette + + As long as no special palette has been set, or after unsetPalette() + has been called, this is either a special palette for the widget + class, the parent's palette or (if this widget is a top level + widget), the default application palette. + + Instead of defining an entirely new palette, you can also use the + \link QWidget::paletteBackgroundColor paletteBackgroundColor\endlink, + \link QWidget::paletteBackgroundPixmap paletteBackgroundPixmap\endlink and + \link QWidget::paletteForegroundColor paletteForegroundColor\endlink + convenience properties to change a widget's + background and foreground appearance only. + + \sa ownPalette, colorGroup(), QApplication::palette() +*/ + +#ifndef QT_NO_PALETTE +void QWidget::setPalette( const QPalette &palette ) +{ + own_palette = TRUE; + if ( pal == palette ) + return; + QPalette old = pal; + pal = palette; + setBackgroundFromMode(); + QEvent ev( QEvent::PaletteChange ); + QApplication::sendEvent( this, &ev ); + if ( children() ) { + QEvent e( QEvent::ParentPaletteChange ); + QObjectListIt it( *children() ); + QWidget *w; + while( (w=(QWidget *)it.current()) != 0 ) { + ++it; + if ( w->isWidgetType() ) + QApplication::sendEvent( w, &e ); + } + } + paletteChange( old ); + update(); +} + +void QWidget::unsetPalette() +{ + // reset the palette + setPalette( qt_naturalWidgetPalette( this ) ); + own_palette = FALSE; +} + +/*! + \fn void QWidget::setPalette( const QPalette&, bool ) + \obsolete + + Use setPalette( const QPalette& p ) instead. +*/ + +/*! + \fn void QWidget::paletteChange( const QPalette &oldPalette ) + + This virtual function is called from setPalette(). \a oldPalette + is the previous palette; you can get the new palette from + palette(). + + Reimplement this function if your widget needs to know when its + palette changes. + + \sa setPalette(), palette() +*/ + +void QWidget::paletteChange( const QPalette & ) +{ +} +#endif // QT_NO_PALETTE + +/*! + \property QWidget::font + \brief the font currently set for the widget + + The fontInfo() function reports the actual font that is being used + by the widget. + + As long as no special font has been set, or after unsetFont() is + called, this is either a special font for the widget class, the + parent's font or (if this widget is a top level widget), the + default application font. + + This code fragment sets a 12 point helvetica bold font: + \code + QFont f( "Helvetica", 12, QFont::Bold ); + setFont( f ); + \endcode + + In addition to setting the font, setFont() informs all children + about the change. + + \sa fontChange() fontInfo() fontMetrics() ownFont() +*/ +void QWidget::setFont( const QFont &font ) +{ + own_font = TRUE; + if ( fnt == font && fnt.d->mask == font.d->mask ) + return; + QFont old = fnt; + fnt = font.resolve( qt_naturalWidgetFont( this ) ); +#if defined(Q_WS_X11) + // make sure the font set on this widget is associated with the correct screen + fnt.x11SetScreen( x11Screen() ); +#endif + if ( children() ) { + QEvent e( QEvent::ParentFontChange ); + QObjectListIt it( *children() ); + QWidget *w; + while( (w=(QWidget *)it.current()) != 0 ) { + ++it; + if ( w->isWidgetType() ) + QApplication::sendEvent( w, &e ); + } + } + if ( hasFocus() ) + setFontSys(); + fontChange( old ); +} + +void QWidget::unsetFont() +{ + // reset the font + setFont( qt_naturalWidgetFont( this ) ); + own_font = FALSE; +} + +/*! + \fn void QWidget::setFont( const QFont&, bool ) + \obsolete + + Use setFont(const QFont& font) instead. +*/ + +/*! + \fn void QWidget::fontChange( const QFont &oldFont ) + + This virtual function is called from setFont(). \a oldFont is the + previous font; you can get the new font from font(). + + Reimplement this function if your widget needs to know when its + font changes. You will almost certainly need to update the widget + using update(). + + The default implementation updates the widget including its + geometry. + + \sa setFont(), font(), update(), updateGeometry() +*/ + +void QWidget::fontChange( const QFont & ) +{ + update(); + updateGeometry(); +} + + +/*! + \fn QFontMetrics QWidget::fontMetrics() const + + Returns the font metrics for the widget's current font. + Equivalent to QFontMetrics(widget->font()). + + \sa font(), fontInfo(), setFont() +*/ + +/*! + \fn QFontInfo QWidget::fontInfo() const + + Returns the font info for the widget's current font. + Equivalent to QFontInto(widget->font()). + + \sa font(), fontMetrics(), setFont() +*/ + + +/*! + \property QWidget::cursor + \brief the cursor shape for this widget + + The mouse cursor will assume this shape when it's over this + widget. See the \link Qt::CursorShape list of predefined cursor + objects\endlink for a range of useful shapes. + + An editor widget might use an I-beam cursor: + \code + setCursor( IbeamCursor ); + \endcode + + If no cursor has been set, or after a call to unsetCursor(), the + parent's cursor is used. The function unsetCursor() has no effect + on top-level widgets. + + \sa QApplication::setOverrideCursor() +*/ + +#ifndef QT_NO_CURSOR +const QCursor &QWidget::cursor() const +{ + if ( testWState(WState_OwnCursor) ) + return (extra && extra->curs) + ? *extra->curs + : arrowCursor; + else + return (isTopLevel() || !parentWidget()) ? arrowCursor : parentWidget()->cursor(); +} +#endif +#ifndef QT_NO_WIDGET_TOPEXTRA +/*! + \property QWidget::caption + \brief the window caption (title) + + This property only makes sense for top-level widgets. If no + caption has been set, the caption is QString::null. + + \sa icon() iconText() +*/ +QString QWidget::caption() const +{ + return extra && extra->topextra + ? extra->topextra->caption + : QString::null; +} + +/*! + \property QWidget::icon + \brief the widget's icon + + This property only makes sense for top-level widgets. If no icon + has been set, icon() returns 0. + + \sa iconText, caption, + \link appicon.html Setting the Application Icon\endlink +*/ +const QPixmap *QWidget::icon() const +{ + return ( extra && extra->topextra ) ? extra->topextra->icon : 0; +} + +/*! + \property QWidget::iconText + \brief the widget's icon text + + This property only makes sense for top-level widgets. If no icon + text has been set, this functions returns QString::null. + + \sa icon, caption +*/ + +QString QWidget::iconText() const +{ + return ( extra && extra->topextra ) ? extra->topextra->iconText + : QString::null; +} +#endif //QT_NO_WIDGET_TOPEXTRA + +/*! + \property QWidget::mouseTracking + \brief whether mouse tracking is enabled for the widget + + If mouse tracking is disabled (the default), the widget only + receives mouse move events when at least one mouse button is + pressed while the mouse is being moved. + + If mouse tracking is enabled, the widget receives mouse move + events even if no buttons are pressed. + + \sa mouseMoveEvent(), QApplication::setGlobalMouseTracking() +*/ + + +/*! + Sets the widget's focus proxy to widget \a w. If \a w is 0, the + function resets this widget to have no focus proxy. + + Some widgets, such as QComboBox, can "have focus", but create a + child widget to actually handle the focus. QComboBox, for example, + creates a QLineEdit which handles the focus. + + setFocusProxy() sets the widget which will actually get focus when + "this widget" gets it. If there is a focus proxy, focusPolicy(), + setFocusPolicy(), setFocus() and hasFocus() all operate on the + focus proxy. + + \sa focusProxy() +*/ + +void QWidget::setFocusProxy( QWidget * w ) +{ + if ( !w && !extra ) + return; + + for ( QWidget* fp = w; fp; fp = fp->focusProxy() ) { + if ( fp == this ) { +#if defined (QT_CHECK_STATE) + qWarning( "%s (%s): already in focus proxy chain", className(), name() ); +#endif + return; + } + } + + createExtra(); + + if ( extra->focus_proxy ) { + disconnect( extra->focus_proxy, SIGNAL(destroyed()), + this, SLOT(focusProxyDestroyed()) ); + extra->focus_proxy = 0; + } + + if ( w ) { + setFocusPolicy( w->focusPolicy() ); + connect( w, SIGNAL(destroyed()), + this, SLOT(focusProxyDestroyed()) ); + } + extra->focus_proxy = w; +} + + +/*! + Returns the focus proxy, or 0 if there is no focus proxy. + + \sa setFocusProxy() +*/ + +QWidget * QWidget::focusProxy() const +{ + return extra ? extra->focus_proxy : 0; +} + + +/*! + \internal + + Internal slot used to clean up if the focus proxy is destroyed. + + \sa setFocusProxy() +*/ + +void QWidget::focusProxyDestroyed() +{ + if ( extra ) + extra->focus_proxy = 0; + setFocusPolicy( NoFocus ); +} + +/*! + \property QWidget::focus + \brief whether this widget (or its focus proxy) has the keyboard + input focus + + Effectively equivalent to \c {qApp->focusWidget() == this}. + + \sa setFocus(), clearFocus(), setFocusPolicy(), QApplication::focusWidget() +*/ +bool QWidget::hasFocus() const +{ + const QWidget* w = this; + while ( w->focusProxy() ) + w = w->focusProxy(); + return qApp->focusWidget() == w; +} + +/*! + Gives the keyboard input focus to this widget (or its focus + proxy) if this widget or one of its parents is the \link + isActiveWindow() active window\endlink. + + First, a focus out event is sent to the focus widget (if any) to + tell it that it is about to lose the focus. Then a focus in event + is sent to this widget to tell it that it just received the focus. + (Nothing happens if the focus in and focus out widgets are the + same.) + + setFocus() gives focus to a widget regardless of its focus policy, + but does not clear any keyboard grab (see grabKeyboard()). + + Be aware that if the widget is hidden, it will not accept focus. + + \warning If you call setFocus() in a function which may itself be + called from focusOutEvent() or focusInEvent(), you may get an + infinite recursion. + + \sa hasFocus() clearFocus() focusInEvent() focusOutEvent() + setFocusPolicy() QApplication::focusWidget() grabKeyboard() + grabMouse() +*/ + +void QWidget::setFocus() +{ + if ( !isEnabled() ) + return; + + if ( focusProxy() ) { + focusProxy()->setFocus(); + return; + } + + QFocusData * f = focusData( TRUE ); + if ( f->it.current() == this && qApp->focusWidget() == this +#if defined(Q_WS_WIN) + && GetFocus() == winId() +#endif + ) + return; + + f->it.toFirst(); + while ( f->it.current() != this && !f->it.atLast() ) + ++f->it; + // at this point, the iterator should point to 'this'. if it + // does not, 'this' must not be in the list - an error, but + // perhaps possible. fix it. + if ( f->it.current() != this ) { + f->focusWidgets.append( this ); + f->it.toLast(); + } + + if ( isActiveWindow() ) { + QWidget * prev = qApp->focus_widget; + if ( prev ) { + // This part is never executed when Q_WS_X11? Preceding XFocusOut + // had already reset focus_widget when received XFocusIn + + // Don't reset input context explicitly here. Whether reset or not + // when focusing out is a responsibility of input methods. For + // example, Japanese input context should not be reset here. The + // context sometimes contains a whole paragraph and has minutes of + // lifetime different to ephemeral one in other languages. The + // input context should be survived until focused again. So we + // delegate the responsibility to input context via + // unfocusInputContext(). + if ( prev != this && prev->isInputMethodEnabled() ) { +#if 0 + prev->resetInputContext(); +#else + prev->unfocusInputContext(); +#endif + } + } +#if defined(Q_WS_WIN) + else { + QInputContext::endComposition(); + } +#endif + qApp->focus_widget = this; + if( isInputMethodEnabled() ) + focusInputContext(); + +#if defined(Q_WS_WIN) + if ( !topLevelWidget()->isPopup() ) + SetFocus( winId() ); + else { +#endif +#if defined(QT_ACCESSIBILITY_SUPPORT) + QAccessible::updateAccessibility( this, 0, QAccessible::Focus ); +#endif +#if defined(Q_WS_WIN) + } +#endif + + if ( prev != this ) { + if ( prev ) { + QFocusEvent out( QEvent::FocusOut ); + QApplication::sendEvent( prev, &out ); + } + + if ( qApp->focus_widget == this ) { + QFocusEvent in( QEvent::FocusIn ); + QApplication::sendEvent( this, &in ); + } + } + } +} + +/*! + Takes keyboard input focus from the widget. + + If the widget has active focus, a \link focusOutEvent() focus out + event\endlink is sent to this widget to tell it that it is about + to lose the focus. + + This widget must enable focus setting in order to get the keyboard + input focus, i.e. it must call setFocusPolicy(). + + \sa hasFocus(), setFocus(), focusInEvent(), focusOutEvent(), + setFocusPolicy(), QApplication::focusWidget() +*/ + +void QWidget::clearFocus() +{ + if ( focusProxy() ) { + focusProxy()->clearFocus(); + return; + } else if ( hasFocus() ) { +#if !defined(Q_WS_X11) + resetInputContext(); +#else + unfocusInputContext(); +#endif + QWidget* w = qApp->focusWidget(); + // clear active focus + qApp->focus_widget = 0; + QFocusEvent out( QEvent::FocusOut ); + QApplication::sendEvent( w, &out ); +#if defined(Q_WS_WIN) + if ( !isPopup() && GetFocus() == winId() ) + SetFocus( 0 ); + else { +#endif +#if defined(QT_ACCESSIBILITY_SUPPORT) + QAccessible::updateAccessibility( this, 0, QAccessible::Focus ); +#endif +#if defined(Q_WS_WIN) + } +#endif + } +} + + +/*! + Finds a new widget to give the keyboard focus to, as appropriate + for Tab and Shift+Tab, and returns TRUE if is can find a new + widget and FALSE if it can't, + + If \a next is TRUE, this function searches "forwards", if \a next + is FALSE, it searches "backwards". + + Sometimes, you will want to reimplement this function. For + example, a web browser might reimplement it to move its "current + active link" forwards or backwards, and call + QWidget::focusNextPrevChild() only when it reaches the last or + first link on the "page". + + Child widgets call focusNextPrevChild() on their parent widgets, + but only the top-level widget decides where to redirect focus. By + overriding this method for an object, you thus gain control of + focus traversal for all child widgets. + + \warning QScrollView uses it own logic for this function, which + does the right thing in most cases. But if you are using a + QScrollView and want complete control of the focus chain you'll + need to override QScrollView::focusNextPrevChild() and your + top-level widgets' focusNextPrevChild() functions. + + \sa focusData() +*/ + +bool QWidget::focusNextPrevChild( bool next ) +{ + QWidget* p = parentWidget(); + if ( !isTopLevel() && p ) + return p->focusNextPrevChild(next); + + QFocusData *f = focusData( TRUE ); + + QWidget *startingPoint = f->it.current(); + QWidget *candidate = 0; + QWidget *w = next ? f->focusWidgets.last() : f->focusWidgets.first(); + extern bool qt_tab_all_widgets; + uint focus_flag = qt_tab_all_widgets ? TabFocus : StrongFocus; + do { + if ( w && w != startingPoint && + ( ( w->focusPolicy() & focus_flag ) == focus_flag ) + && !w->focusProxy() && w->isVisibleTo(this) && w->isEnabled()) + candidate = w; + w = next ? f->focusWidgets.prev() : f->focusWidgets.next(); + } while( w && !(candidate && w==startingPoint) ); + + if ( !candidate ) + return FALSE; + + candidate->setFocus(); + return TRUE; +} + +/*! + Returns the focus widget in this widget's window. This is not the + same as QApplication::focusWidget(), which returns the focus + widget in the currently active window. +*/ + +QWidget *QWidget::focusWidget() const +{ + QWidget *that = (QWidget *)this; // mutable + QFocusData *f = that->focusData( FALSE ); + if ( f && f->focusWidgets.count() && f->it.current() == 0 ) + f->it.toFirst(); + return ( f && f->it.current() ) ? f->it.current() : 0; +} + + +/*! + Returns the focus data for this widget's top-level widget. + + Focus data always belongs to the top-level widget. The focus data + list contains all the widgets in this top-level widget that can + accept focus, in tab order. An iterator points to the current + focus widget (focusWidget() returns a pointer to this widget). + + This information is useful for implementing advanced versions of + focusNextPrevChild(). +*/ +QFocusData * QWidget::focusData() +{ + return focusData( TRUE ); +} + +/*! + \internal + + Internal function which lets us ask for the focus data, creating + it if it doesn't exist and \a create is TRUE. +*/ +QFocusData * QWidget::focusData( bool create ) +{ + QWidget * tlw = topLevelWidget(); + QWExtra * ed = tlw->extraData(); + if ( !ed || !ed->topextra ) { + if ( !create ) + return 0; + tlw->createTLExtra(); + ed = tlw->extraData(); + } + if ( create && !ed->topextra->focusData ) + ed->topextra->focusData = new QFocusData; + + return ed->topextra->focusData; +} + +/*! + \property QWidget::inputMethodEnabled + \brief enables or disables the use of input methods for this widget. + + Most Widgets (as eg. buttons) that do not handle text input should have + the input method disabled if they have focus. This is the default. + + If a widget handles text input it should set this property to TRUE. +*/ + +void QWidget::setInputMethodEnabled( bool b ) +{ + im_enabled = b; +#ifdef Q_WS_WIN + QInputContext::enable( this, im_enabled & !((bool)testWState(WState_Disabled)) ); +#endif +} + + +/*! + Enables key event compression, if \a compress is TRUE, and + disables it if \a compress is FALSE. + + Key compression is off by default (except for QLineEdit and + QTextEdit), so widgets receive one key press event for each key + press (or more, since autorepeat is usually on). If you turn it on + and your program doesn't keep up with key input, Qt may try to + compress key events so that more than one character can be + processed in each event. + + For example, a word processor widget might receive 2, 3 or more + characters in each QKeyEvent::text(), if the layout recalculation + takes too long for the CPU. + + If a widget supports multiple character unicode input, it is + always safe to turn the compression on. + + Qt performs key event compression only for printable characters. + Modifier keys, cursor movement keys, function keys and + miscellaneous action keys (e.g. Escape, Enter, Backspace, + PrintScreen) will stop key event compression, even if there are + more compressible key events available. + + Not all platforms support this compression, in which case turning + it on will have no effect. + + \sa QKeyEvent::text(); +*/ + +void QWidget::setKeyCompression(bool compress) +{ + if ( compress ) + setWState( WState_CompressKeys ); + else + clearWState( WState_CompressKeys ); +} + +/*! + \property QWidget::isActiveWindow + \brief whether this widget is the active window + + The active window is the window that contains the widget + that has keyboard focus. + + When popup windows are visible, this property is TRUE for both the + active window \e and for the popup. + + \sa setActiveWindow(), QApplication::activeWindow() +*/ +bool QWidget::isActiveWindow() const +{ + QWidget *tlw = topLevelWidget(); + if(testWFlags(WSubWindow) && parentWidget()) + tlw = parentWidget()->topLevelWidget(); + if(tlw == qApp->activeWindow() || ( isVisible() && tlw->isPopup() )) + return TRUE; +#ifndef QT_NO_STYLE + if(style().styleHint(QStyle::SH_Widget_ShareActivation, this )) { + if((tlw->isDialog() || (tlw->testWFlags(Qt::WStyle_Tool) && !tlw->isPopup())) && + !tlw->testWFlags(Qt::WShowModal) && + (!tlw->parentWidget() || tlw->parentWidget()->isActiveWindow())) + return TRUE; + QWidget *w = qApp->activeWindow(); + if( !testWFlags(WSubWindow) && w && w->testWFlags(WSubWindow) && + w->parentWidget()->topLevelWidget() == tlw) + return TRUE; + while(w && (tlw->isDialog() || tlw->testWFlags(Qt::WStyle_Tool)) && + !w->testWFlags(Qt::WShowModal) && w->parentWidget()) { + w = w->parentWidget()->topLevelWidget(); + if( w == tlw ) + return TRUE; + } + } +#endif +#if defined(Q_WS_WIN32) + HWND parent = tlw->winId(); + HWND topparent = GetActiveWindow(); + while ( parent ) { + parent = ::GetParent( parent ); + if ( parent && parent == topparent ) + return TRUE; + } +#endif + + return FALSE; +} + +/*! + Moves the \a second widget around the ring of focus widgets so + that keyboard focus moves from the \a first widget to the \a + second widget when the Tab key is pressed. + + Note that since the tab order of the \a second widget is changed, + you should order a chain like this: + + \code + setTabOrder( a, b ); // a to b + setTabOrder( b, c ); // a to b to c + setTabOrder( c, d ); // a to b to c to d + \endcode + + \e not like this: + + \code + setTabOrder( c, d ); // c to d WRONG + setTabOrder( a, b ); // a to b AND c to d + setTabOrder( b, c ); // a to b to c, but not c to d + \endcode + + If \a first or \a second has a focus proxy, setTabOrder() + correctly substitutes the proxy. + + \sa setFocusPolicy(), setFocusProxy() +*/ +void QWidget::setTabOrder( QWidget* first, QWidget *second ) +{ + if ( !first || !second || + first->focusPolicy() == NoFocus || second->focusPolicy() == NoFocus ) + return; + + // If first is redirected, set first to the last child of first + // that can take keyboard focus so that second is inserted after + // that last child, and the focus order within first is (more + // likely to be) preserved. + if ( first->focusProxy() ) { + QObjectList *l = first->queryList( "QWidget" ); + if ( l && l->count() ) { + QObjectListIt it(*l); + it.toLast(); + while (it.current()) { + if (((QWidget*)it.current())->topLevelWidget() == first->topLevelWidget()) { + first = (QWidget*)it.current(); + if (first->focusPolicy() != NoFocus) + break; + } + --it; + } + } + delete l; + } + while ( first->focusProxy() ) + first = first->focusProxy(); + while ( second->focusProxy() ) + second = second->focusProxy(); + + QFocusData *f = first->focusData( TRUE ); + bool focusThere = (f->it.current() == second ); + f->focusWidgets.removeRef( second ); + if ( f->focusWidgets.findRef( first ) >= 0 ) + f->focusWidgets.insert( f->focusWidgets.at() + 1, second ); + else + f->focusWidgets.append( second ); + if ( focusThere ) { // reset iterator so tab will work appropriately + f->it.toFirst(); + while( f->it.current() && f->it.current() != second ) + ++f->it; + } +} + +/*!\internal + + Moves the relevant subwidgets of this widget from the \a oldtlw's + tab chain to that of the new parent, if there's anything to move and + we're really moving + + This function is called from QWidget::reparent() *after* the widget + has been reparented. + + \sa reparent() +*/ + +void QWidget::reparentFocusWidgets( QWidget * oldtlw ) +{ + if ( oldtlw == topLevelWidget() ) + return; // nothing to do + + QFocusData * from = oldtlw ? oldtlw->topData()->focusData : 0; + QFocusData * to; + to = focusData(); + + if ( from ) { + from->focusWidgets.first(); + do { + QWidget * pw = from->focusWidgets.current(); + while( pw && pw != this ) + pw = pw->parentWidget(); + if ( pw == this ) { + QWidget * w = from->focusWidgets.take(); + if ( w == from->it.current() ) + // probably best to clear keyboard focus, or + // the user might become rather confused + w->clearFocus(); + if ( !isTopLevel() ) + to->focusWidgets.append( w ); + } else { + from->focusWidgets.next(); + } + } while( from->focusWidgets.current() ); + } + + if ( to->focusWidgets.findRef(this) < 0 ) + to->focusWidgets.append( this ); + + if ( !isTopLevel() && extra && extra->topextra && extra->topextra->focusData ) { + // this widget is no longer a top-level widget, so get rid + // of old focus data + delete extra->topextra->focusData; + extra->topextra->focusData = 0; + } +} + +/*! + \fn void QWidget::recreate( QWidget *parent, WFlags f, const QPoint & p, bool showIt ) + + \obsolete + + This method is provided to aid porting from Qt 1.0 to 2.0. It has + been renamed reparent() in Qt 2.0. +*/ + +/*! + \property QWidget::frameSize + \brief the size of the widget including any window frame +*/ +QSize QWidget::frameSize() const +{ + if ( isTopLevel() && !isPopup() ) { + if ( fstrut_dirty ) + updateFrameStrut(); + QWidget *that = (QWidget *) this; + QTLWExtra *top = that->topData(); + return QSize( crect.width() + top->fleft + top->fright, + crect.height() + top->ftop + top->fbottom ); + } + return crect.size(); +} + +/*! + \internal + + Recursive function that updates \a widget and all its children, + if they have some parent background origin. +*/ +static void qt_update_bg_recursive( QWidget *widget ) +{ + if ( !widget || widget->isHidden() || widget->backgroundOrigin() == QWidget::WidgetOrigin || !widget->backgroundPixmap() ) + return; + + const QObjectList *lst = widget->children(); + + if ( lst ) { + QObjectListIterator it( *lst ); + QWidget *widget; + while ( (widget = (QWidget*)it.current()) ) { + ++it; + if ( widget->isWidgetType() && !widget->isHidden() && !widget->isTopLevel() && !widget->testWFlags(Qt::WSubWindow) ) + qt_update_bg_recursive( widget ); + } + } + QApplication::postEvent( widget, new QPaintEvent( widget->clipRegion(), !widget->testWFlags(Qt::WRepaintNoErase) ) ); +} + +/*! + \overload + + This corresponds to move( QPoint(\a x, \a y) ). +*/ + +void QWidget::move( int x, int y ) +{ + QPoint oldp(pos()); + internalSetGeometry( x + geometry().x() - QWidget::x(), + y + geometry().y() - QWidget::y(), + width(), height(), TRUE ); + if ( isVisible() && oldp != pos() ) + qt_update_bg_recursive( this ); +} + +/*! + \overload + + This corresponds to resize( QSize(\a w, \a h) ). +*/ +void QWidget::resize( int w, int h ) +{ + internalSetGeometry( geometry().x(), geometry().y(), w, h, FALSE ); + setWState( WState_Resized ); +} + +/*! + \overload + + This corresponds to setGeometry( QRect(\a x, \a y, \a w, \a h) ). +*/ +void QWidget::setGeometry( int x, int y, int w, int h ) +{ + QPoint oldp( pos( )); + internalSetGeometry( x, y, w, h, TRUE ); + setWState( WState_Resized ); + if ( isVisible() && oldp != pos() ) + qt_update_bg_recursive( this ); +} + +/*! + \property QWidget::focusEnabled + \brief whether the widget accepts keyboard focus + + Keyboard focus is initially disabled (i.e. focusPolicy() == + \c QWidget::NoFocus). + + You must enable keyboard focus for a widget if it processes + keyboard events. This is normally done from the widget's + constructor. For instance, the QLineEdit constructor calls + setFocusPolicy(QWidget::StrongFocus). + + \sa setFocusPolicy(), focusInEvent(), focusOutEvent(), keyPressEvent(), + keyReleaseEvent(), isEnabled() +*/ + +/*! + \enum QWidget::FocusPolicy + + This enum type defines the various policies a widget can have with + respect to acquiring keyboard focus. + + \value TabFocus the widget accepts focus by tabbing. + \value ClickFocus the widget accepts focus by clicking. + \value StrongFocus the widget accepts focus by both tabbing + and clicking. On Mac OS X this will also + be indicate that the widget accepts tab focus + when in 'Text/List focus mode'. + \value WheelFocus like StrongFocus plus the widget accepts + focus by using the mouse wheel. + \value NoFocus the widget does not accept focus. + +*/ + +/*! + \property QWidget::focusPolicy + \brief the way the widget accepts keyboard focus + + The policy is \c QWidget::TabFocus if the widget accepts keyboard + focus by tabbing, \c QWidget::ClickFocus if the widget accepts + focus by clicking, \c QWidget::StrongFocus if it accepts both, and + \c QWidget::NoFocus (the default) if it does not accept focus at + all. + + You must enable keyboard focus for a widget if it processes + keyboard events. This is normally done from the widget's + constructor. For instance, the QLineEdit constructor calls + setFocusPolicy(QWidget::StrongFocus). + + \sa focusEnabled, focusInEvent(), focusOutEvent(), keyPressEvent(), + keyReleaseEvent(), enabled +*/ + +void QWidget::setFocusPolicy( FocusPolicy policy ) +{ + if ( focusProxy() ) + focusProxy()->setFocusPolicy( policy ); + if ( policy != NoFocus ) { + QFocusData * f = focusData( TRUE ); + if ( f->focusWidgets.findRef( this ) < 0 ) + f->focusWidgets.append( this ); + } + focus_policy = (uint) policy; +} + +/*! + \property QWidget::updatesEnabled + \brief whether updates are enabled + + Calling update() and repaint() has no effect if updates are + disabled. Paint events from the window system are processed + normally even if updates are disabled. + + setUpdatesEnabled() is normally used to disable updates for a + short period of time, for instance to avoid screen flicker during + large changes. + + Example: + \code + setUpdatesEnabled( FALSE ); + bigVisualChanges(); + setUpdatesEnabled( TRUE ); + repaint(); + \endcode + + \sa update(), repaint(), paintEvent() +*/ +void QWidget::setUpdatesEnabled( bool enable ) +{ + if ( enable ) + clearWState( WState_BlockUpdates ); + else + setWState( WState_BlockUpdates ); +} + +/*! + Shows the widget and its child widgets. + + If its size or position has changed, Qt guarantees that a widget + gets move and resize events just before it is shown. + + You almost never have to reimplement this function. If you need to + change some settings before a widget is shown, use showEvent() + instead. If you need to do some delayed initialization use + polish(). + + \sa showEvent(), hide(), showMinimized(), showMaximized(), + showNormal(), isVisible(), polish() +*/ + +void QWidget::show() +{ + if ( testWState(WState_Visible) ) + return; + + bool wasHidden = isHidden(); + bool postLayoutHint = !isTopLevel() && wasHidden; + clearWState( WState_ForceHide | WState_CreatedHidden ); + + if ( !isTopLevel() && !parentWidget()->isVisible() ) { + // we should become visible, but one of our ancestors is + // explicitly hidden. Since we cleared the ForceHide flag, our + // immediate parent will call show() on us again during its + // own processing of show(). + if ( wasHidden ) { + QEvent showToParentEvent( QEvent::ShowToParent ); + QApplication::sendEvent( this, &showToParentEvent ); + } + if ( postLayoutHint ) + QApplication::postEvent( parentWidget(), + new QEvent(QEvent::LayoutHint) ); + return; + } + + in_show = TRUE; // set qws recursion watch + + QApplication::sendPostedEvents( this, QEvent::ChildInserted ); + + uint state = isTopLevel() ? windowState() : 0; +#ifndef Q_OS_TEMP + if ( isTopLevel() && !testWState( WState_Resized ) ) { + // do this before sending the posted resize events. Otherwise + // the layout would catch the resize event and may expand the + // minimum size. + QSize s = qt_naturalWidgetSize( this ); + if ( !s.isEmpty() ) + resize( s ); + } +#endif // Q_OS_TEMP + + QApplication::sendPostedEvents( this, QEvent::Move ); + QApplication::sendPostedEvents( this, QEvent::Resize ); + + // the resizing and layouting might have changed the window state + if (isTopLevel() && windowState() != state) + setWindowState(state); + + setWState( WState_Visible ); + + if ( parentWidget() ) + QApplication::sendPostedEvents( parentWidget(), + QEvent::ChildInserted ); + + if ( extra ) { + int w = crect.width(); + int h = crect.height(); + if ( w < extra->minw || h < extra->minh || + w > extra->maxw || h > extra->maxh ) { + w = QMAX( extra->minw, QMIN( w, extra->maxw )); + h = QMAX( extra->minh, QMIN( h, extra->maxh )); + resize( w, h ); // deferred resize + } + } + + if ( testWFlags(WStyle_Tool) || isPopup() ) { + raise(); + } else if ( testWFlags(WType_TopLevel) ) { + while ( QApplication::activePopupWidget() ) { + if ( !QApplication::activePopupWidget()->close() ) + break; + } + } + + if ( !testWState(WState_Polished) ) + polish(); + + showChildren( FALSE ); + + if ( postLayoutHint ) + QApplication::postEvent( parentWidget(), + new QEvent(QEvent::LayoutHint) ); + + // Required for Mac, not sure whether we should always do that + if( isTopLevel() ) + QApplication::sendPostedEvents(0, QEvent::LayoutHint); + + // On Windows, show the popup now so that our own focus handling + // stores the correct old focus widget even if it's stolen in the showevent +#if defined(Q_WS_WIN) + if ( testWFlags(WType_Popup) ) + qApp->openPopup( this ); +#endif + + QShowEvent showEvent; + QApplication::sendEvent( this, &showEvent ); + + if ( testWFlags(WShowModal) ) { + // qt_enter_modal *before* show, otherwise the initial + // stacking might be wrong + qt_enter_modal( this ); + } + + // do not show the window directly, but post a show-window request + // to reduce flicker with widgets in layouts + if ( postLayoutHint ) + QApplication::postEvent( this, new QEvent( QEvent::ShowWindowRequest ) ); + else + showWindow(); + +#if !defined(Q_WS_WIN) + if ( testWFlags(WType_Popup) ) + qApp->openPopup( this ); +#endif + +#if defined(QT_ACCESSIBILITY_SUPPORT) + QAccessible::updateAccessibility( this, 0, QAccessible::ObjectShow ); +#endif + + in_show = FALSE; // reset qws recursion watch +} + +/*! \fn void QWidget::iconify() + \obsolete +*/ + +/*! + Hides the widget. + + You almost never have to reimplement this function. If you need to + do something after a widget is hidden, use hideEvent() instead. + + \sa hideEvent(), isHidden(), show(), showMinimized(), isVisible(), close() +*/ + +void QWidget::hide() +{ + clearWState( WState_CreatedHidden ); + if ( testWState(WState_ForceHide) ) + return; + + setWState( WState_ForceHide ); + + if ( testWFlags(WType_Popup) ) + qApp->closePopup( this ); + + // Move test modal here. Otherwise, a modal dialog could get + // destroyed and we lose all access to its parent because we haven't + // left modality. (Eg. modal Progress Dialog) + if ( testWFlags(WShowModal) ) + qt_leave_modal( this ); + +#if defined(Q_WS_WIN) + if ( isTopLevel() && !isPopup() && parentWidget() && isActiveWindow() ) + parentWidget()->setActiveWindow(); // Activate parent +#endif + + hideWindow(); + + if ( testWState(WState_Visible) ) { + clearWState( WState_Visible ); + + // next bit tries to move the focus if the focus widget is now + // hidden. + if ( qApp && qApp->focusWidget() == this ) + focusNextPrevChild( TRUE ); + QHideEvent hideEvent; + QApplication::sendEvent( this, &hideEvent ); + hideChildren( FALSE ); + +#if defined(QT_ACCESSIBILITY_SUPPORT) + QAccessible::updateAccessibility( this, 0, QAccessible::ObjectHide ); +#endif + } else { + QEvent hideToParentEvent( QEvent::HideToParent ); + QApplication::sendEvent( this, &hideToParentEvent ); + } + + // post layout hint for non toplevels. The parent widget check is + // necessary since the function is called in the destructor + if ( !isTopLevel() && parentWidget() ) + QApplication::postEvent( parentWidget(), + new QEvent( QEvent::LayoutHint) ); +} + +void QWidget::setShown( bool show ) +{ + if ( show ) + this->show(); + else + hide(); +} + +void QWidget::setHidden( bool hide ) +{ + if ( hide ) + this->hide(); + else + show(); +} + +void QWidget::showChildren( bool spontaneous ) +{ + if ( children() ) { + QObjectListIt it(*children()); + register QObject *object; + QWidget *widget; + while ( it ) { + object = it.current(); + ++it; + if ( object->isWidgetType() ) { + widget = (QWidget*)object; + if ( !widget->isTopLevel() && widget->isShown() ) { + if ( spontaneous ) { + widget->showChildren( spontaneous ); + QShowEvent e; + QApplication::sendSpontaneousEvent( widget, &e ); + } else { + widget->show(); + } + } + } + } + } +} + +void QWidget::hideChildren( bool spontaneous ) +{ + if ( children() ) { + QObjectListIt it(*children()); + register QObject *object; + QWidget *widget; + while ( it ) { + object = it.current(); + ++it; + if ( object->isWidgetType() ) { + widget = (QWidget*)object; + if ( !widget->isTopLevel() && widget->isShown() ) { + if ( !spontaneous ) + widget->clearWState( WState_Visible ); + widget->hideChildren( spontaneous ); + QHideEvent e; + if ( spontaneous ) + QApplication::sendSpontaneousEvent( widget, &e ); + else + QApplication::sendEvent( widget, &e ); + } + } + } + } +} + + +/*! + Delayed initialization of a widget. + + This function will be called \e after a widget has been fully + created and \e before it is shown the very first time. + + Polishing is useful for final initialization which depends on + having an instantiated widget. This is something a constructor + cannot guarantee since the initialization of the subclasses might + not be finished. + + After this function, the widget has a proper font and palette and + QApplication::polish() has been called. + + Remember to call QWidget's implementation first when reimplementing this + function to ensure that your program does not end up in infinite recursion. + + \sa constPolish(), QApplication::polish() +*/ + +void QWidget::polish() +{ +#ifndef QT_NO_WIDGET_TOPEXTRA + if ( isTopLevel() ) { + const QPixmap *pm = icon(); + if ( !pm || pm->isNull() ) { + QWidget *mw = (QWidget *)parent(); + pm = mw ? mw->icon() : 0; + if ( pm && !pm->isNull() ) + setIcon( *pm ); + else { + mw = mw ? mw->topLevelWidget() : 0; + pm = mw ? mw->icon() : 0; + if ( pm && !pm->isNull() ) + setIcon( *pm ); + else { + mw = qApp ? qApp->mainWidget() : 0; + pm = mw ? mw->icon() : 0; + if ( pm && !pm->isNull() ) + setIcon( *pm ); + } + } + } + } +#endif + if ( !testWState(WState_Polished) ) { + if ( ! own_font && + ! QApplication::font( this ).isCopyOf( QApplication::font() ) ) + unsetFont(); +#ifndef QT_NO_PALETTE + if ( ! own_palette && + ! QApplication::palette( this ).isCopyOf( QApplication::palette() ) ) + unsetPalette(); +#endif + setWState(WState_Polished); + qApp->polish( this ); + QApplication::sendPostedEvents( this, QEvent::ChildInserted ); + } +} + + +/*! + \fn void QWidget::constPolish() const + + Ensures that the widget is properly initialized by calling + polish(). + + Call constPolish() from functions like sizeHint() that depends on + the widget being initialized, and that may be called before + show(). + + \warning Do not call constPolish() on a widget from inside that + widget's constructor. + + \sa polish() +*/ + +/*! + \overload + + Closes this widget. Returns TRUE if the widget was closed; + otherwise returns FALSE. + + If \a alsoDelete is TRUE or the widget has the \c + WDestructiveClose widget flag, the widget is also deleted. The + widget can prevent itself from being closed by rejecting the + \l QCloseEvent it gets. A close events is delivered to the widget + no matter if the widget is visible or not. + + The QApplication::lastWindowClosed() signal is emitted when the + last visible top level widget is closed. + + Note that closing the \l QApplication::mainWidget() terminates the + application. + + \sa closeEvent(), QCloseEvent, hide(), QApplication::quit(), + QApplication::setMainWidget(), QApplication::lastWindowClosed() +*/ + +bool QWidget::close( bool alsoDelete ) +{ + if ( is_closing ) + return TRUE; + is_closing = 1; + WId id = winId(); + bool isMain = qApp->mainWidget() == this; + bool checkLastWindowClosed = isTopLevel() && !isPopup(); + bool deleted = FALSE; + QCloseEvent e; + QApplication::sendEvent( this, &e ); + deleted = !QWidget::find(id); + if ( !deleted && !e.isAccepted() ) { + is_closing = 0; + return FALSE; + } + if ( !deleted && !isHidden() ) + hide(); + if ( checkLastWindowClosed + && qApp->receivers(SIGNAL(lastWindowClosed())) ) { + /* if there is no non-withdrawn top level window left (except + the desktop, popups, or dialogs with parents), we emit the + lastWindowClosed signal */ + QWidgetList *list = qApp->topLevelWidgets(); + QWidget *widget = list->first(); + while ( widget ) { + if ( !widget->isHidden() + && !widget->isDesktop() + && !widget->isPopup() + && (!widget->isDialog() || !widget->parentWidget())) + break; + widget = list->next(); + } + delete list; + if ( widget == 0 ) + emit qApp->lastWindowClosed(); + } + if ( isMain ) + qApp->quit(); + if ( deleted ) + return TRUE; + is_closing = 0; + if ( alsoDelete ) + delete this; + else if ( testWFlags(WDestructiveClose) ) { + clearWFlags(WDestructiveClose); + deleteLater(); + } + return TRUE; +} + + +/*! + \fn bool QWidget::close() + + Closes this widget. Returns TRUE if the widget was closed; + otherwise returns FALSE. + + First it sends the widget a QCloseEvent. The widget is \link + hide() hidden\endlink if it \link QCloseEvent::accept() + accepts\endlink the close event. The default implementation of + QWidget::closeEvent() accepts the close event. + + The \l QApplication::lastWindowClosed() signal is emitted when the + last visible top level widget is closed. + +*/ + +/*! + \property QWidget::visible + \brief whether the widget is visible + + Calling show() sets the widget to visible status if all its parent + widgets up to the top-level widget are visible. If an ancestor is + not visible, the widget won't become visible until all its + ancestors are shown. + + Calling hide() hides a widget explicitly. An explicitly hidden + widget will never become visible, even if all its ancestors become + visible, unless you show it. + + A widget receives show and hide events when its visibility status + changes. Between a hide and a show event, there is no need to + waste CPU cycles preparing or displaying information to the user. + A video application, for example, might simply stop generating new + frames. + + A widget that happens to be obscured by other windows on the + screen is considered to be visible. The same applies to iconified + top-level widgets and windows that exist on another virtual + desktop (on platforms that support this concept). A widget + receives spontaneous show and hide events when its mapping status + is changed by the window system, e.g. a spontaneous hide event + when the user minimizes the window, and a spontaneous show event + when the window is restored again. + + \sa show(), hide(), isHidden(), isVisibleTo(), isMinimized(), + showEvent(), hideEvent() +*/ + + +/*! + Returns TRUE if this widget would become visible if \a ancestor is + shown; otherwise returns FALSE. + + The TRUE case occurs if neither the widget itself nor any parent + up to but excluding \a ancestor has been explicitly hidden. + + This function will still return TRUE if the widget is obscured by + other windows on the screen, but could be physically visible if it + or they were to be moved. + + isVisibleTo(0) is identical to isVisible(). + + \sa show() hide() isVisible() +*/ + +bool QWidget::isVisibleTo(QWidget* ancestor) const +{ + if ( !ancestor ) + return isVisible(); + const QWidget * w = this; + while ( w + && w->isShown() + && !w->isTopLevel() + && w->parentWidget() + && w->parentWidget() != ancestor ) + w = w->parentWidget(); + return w->isShown(); +} + + +/*! + \fn bool QWidget::isVisibleToTLW() const + \obsolete + + This function is deprecated. It is equivalent to isVisible() +*/ + +/*! + \property QWidget::hidden + \brief whether the widget is explicitly hidden + + If FALSE, the widget is visible or would become visible if all its + ancestors became visible. + + \sa hide(), show(), isVisible(), isVisibleTo(), shown +*/ + +/*! + \property QWidget::shown + \brief whether the widget is shown + + If TRUE, the widget is visible or would become visible if all its + ancestors became visible. + + \sa hide(), show(), isVisible(), isVisibleTo(), hidden +*/ + +/*! + \property QWidget::visibleRect + \brief the visible rectangle + + \obsolete + + No longer necessary, you can simply call repaint(). If you do not + need the rectangle for repaint(), use clipRegion() instead. +*/ +QRect QWidget::visibleRect() const +{ + QRect r = rect(); + const QWidget * w = this; + int ox = 0; + int oy = 0; + while ( w + && w->isVisible() + && !w->isTopLevel() + && w->parentWidget() ) { + ox -= w->x(); + oy -= w->y(); + w = w->parentWidget(); + r = r.intersect( QRect( ox, oy, w->width(), w->height() ) ); + } + if ( !w->isVisible() ) + return QRect(); + return r; +} + +/*! + Returns the unobscured region where paint events can occur. + + For visible widgets, this is an approximation of the area not + covered by other widgets; otherwise, this is an empty region. + + The repaint() function calls this function if necessary, so in + general you do not need to call it. + +*/ +QRegion QWidget::clipRegion() const +{ + return visibleRect(); +} + + +/*! + Adjusts the size of the widget to fit the contents. + + Uses sizeHint() if valid (i.e if the size hint's width and height + are \>= 0), otherwise sets the size to the children rectangle (the + union of all child widget geometries). + + \sa sizeHint(), childrenRect() +*/ + +void QWidget::adjustSize() +{ + QApplication::sendPostedEvents( 0, QEvent::ChildInserted ); + QApplication::sendPostedEvents( 0, QEvent::LayoutHint ); + if ( !testWState(WState_Polished) ) + polish(); + QSize s = sizeHint(); + + if ( isTopLevel() ) { + +#if defined(Q_WS_X11) + QRect screen = QApplication::desktop()->screenGeometry( x11Screen() ); +#else // all others + QRect screen = QApplication::desktop()->screenGeometry( pos() ); +#endif + +#ifndef QT_NO_LAYOUT + if ( layout() ) { + if ( layout()->hasHeightForWidth() ) { + s = s.boundedTo( screen.size() ); + s.setHeight( layout()->totalHeightForWidth( s.width() ) ); + } + } else +#endif + { + if ( sizePolicy().hasHeightForWidth() ) { + s = s.boundedTo( screen.size() ); + s.setHeight( heightForWidth( s.width() ) ); + } + } + } + if ( s.isValid() ) { + resize( s ); + return; + } + QRect r = childrenRect(); // get children rectangle + if ( r.isNull() ) // probably no widgets + return; + resize( r.width() + 2 * r.x(), r.height() + 2 * r.y() ); +} + + +/*! + \property QWidget::sizeHint + \brief the recommended size for the widget + + If the value of this property is an invalid size, no size is + recommended. + + The default implementation of sizeHint() returns an invalid size + if there is no layout for this widget, and returns the layout's + preferred size otherwise. + + \sa QSize::isValid(), minimumSizeHint(), sizePolicy(), + setMinimumSize(), updateGeometry() +*/ + +QSize QWidget::sizeHint() const +{ +#ifndef QT_NO_LAYOUT + if ( layout() ) + return layout()->totalSizeHint(); +#endif + return QSize( -1, -1 ); +} + +/*! + \property QWidget::minimumSizeHint + \brief the recommended minimum size for the widget + + If the value of this property is an invalid size, no minimum size + is recommended. + + The default implementation of minimumSizeHint() returns an invalid + size if there is no layout for this widget, and returns the + layout's minimum size otherwise. Most built-in widgets reimplement + minimumSizeHint(). + + \l QLayout will never resize a widget to a size smaller than + minimumSizeHint. + + \sa QSize::isValid(), resize(), setMinimumSize(), sizePolicy() +*/ +QSize QWidget::minimumSizeHint() const +{ +#ifndef QT_NO_LAYOUT + if ( layout() ) + return layout()->totalMinimumSize(); +#endif + return QSize( -1, -1 ); +} + + +/*! + \fn QWidget *QWidget::parentWidget( bool sameWindow ) const + + Returns the parent of this widget, or 0 if it does not have any + parent widget. If \a sameWindow is TRUE and the widget is top + level returns 0; otherwise returns the widget's parent. +*/ + +/*! + \fn WFlags QWidget::testWFlags( WFlags f ) const + + Returns the bitwise AND of the widget flags and \a f. + + Widget flags are a combination of \l{Qt::WidgetFlags}. + + If you want to test for the presence of multiple flags (or + composite flags such as \c WStyle_Splash), test the + return value for equality against the argument. For example: + + \code + int flags = WStyle_Tool | WStyle_NoBorder; + if ( testWFlags(flags) ) + ... // WStyle_Tool or WStyle_NoBorder or both are set + if ( testWFlags(flags) == flags ) + ... // both WStyle_Tool and WStyle_NoBorder are set + \endcode + + \sa getWFlags(), setWFlags(), clearWFlags() +*/ + +/*! + \fn WState QWidget::testWState( WState s ) const + \internal + + Returns the bitwise AND of the widget states and \a s. +*/ + +/*! + \fn uint QWidget::getWState() const + + \internal + + Returns the current widget state. +*/ +/*! + \fn void QWidget::clearWState( uint n ) + + \internal + + Clears the widgets states \a n. +*/ +/*! + \fn void QWidget::setWState( uint n ) + + \internal + + Sets the widgets states \a n. +*/ + + + +/***************************************************************************** + QWidget event handling + *****************************************************************************/ + +/*! + This is the main event handler; it handles event \a e. You can + reimplement this function in a subclass, but we recommend using + one of the specialized event handlers instead. + + The main event handler first passes an event through all \link + QObject::installEventFilter() event filters\endlink that have been + installed. If none of the filters intercept the event, it calls + one of the specialized event handlers. + + Key press and release events are treated differently from other + events. event() checks for Tab and Shift+Tab and tries to move the + focus appropriately. If there is no widget to move the focus to + (or the key press is not Tab or Shift+Tab), event() calls + keyPressEvent(). + + This function returns TRUE if it is able to pass the event over to + someone (i.e. someone wanted the event); otherwise returns FALSE. + + \sa closeEvent(), focusInEvent(), focusOutEvent(), enterEvent(), + keyPressEvent(), keyReleaseEvent(), leaveEvent(), + mouseDoubleClickEvent(), mouseMoveEvent(), mousePressEvent(), + mouseReleaseEvent(), moveEvent(), paintEvent(), resizeEvent(), + QObject::event(), QObject::timerEvent() +*/ + +bool QWidget::event( QEvent *e ) +{ + if ( QObject::event( e ) ) + return TRUE; + + switch ( e->type() ) { + case QEvent::MouseMove: + mouseMoveEvent( (QMouseEvent*)e ); + if ( ! ((QMouseEvent*)e)->isAccepted() ) + return FALSE; + break; + + case QEvent::MouseButtonPress: + // Don't reset input context here. Whether reset or not is + // a responsibility of input method. reset() will be + // called by mouseHandler() of input method if necessary + // via mousePressEvent() of text widgets. +#if 0 + resetInputContext(); +#endif + mousePressEvent( (QMouseEvent*)e ); + if ( ! ((QMouseEvent*)e)->isAccepted() ) + return FALSE; + break; + + case QEvent::MouseButtonRelease: + mouseReleaseEvent( (QMouseEvent*)e ); + if ( ! ((QMouseEvent*)e)->isAccepted() ) + return FALSE; + break; + + case QEvent::MouseButtonDblClick: + mouseDoubleClickEvent( (QMouseEvent*)e ); + if ( ! ((QMouseEvent*)e)->isAccepted() ) + return FALSE; + break; +#ifndef QT_NO_WHEELEVENT + case QEvent::Wheel: + wheelEvent( (QWheelEvent*)e ); + if ( ! ((QWheelEvent*)e)->isAccepted() ) + return FALSE; + break; +#endif + case QEvent::TabletMove: + case QEvent::TabletPress: + case QEvent::TabletRelease: + tabletEvent( (QTabletEvent*)e ); + if ( ! ((QTabletEvent*)e)->isAccepted() ) + return FALSE; + break; + case QEvent::Accel: + ((QKeyEvent*)e)->ignore(); + return FALSE; + case QEvent::KeyPress: { + QKeyEvent *k = (QKeyEvent *)e; + bool res = FALSE; + if ( !(k->state() & ControlButton || k->state() & AltButton) ) { + if ( k->key() == Key_Backtab || + (k->key() == Key_Tab && + (k->state() & ShiftButton)) ) { + QFocusEvent::setReason( QFocusEvent::Backtab ); + res = focusNextPrevChild( FALSE ); + QFocusEvent::resetReason(); + + } else if ( k->key() == Key_Tab ) { + QFocusEvent::setReason( QFocusEvent::Tab ); + res = focusNextPrevChild( TRUE ); + QFocusEvent::resetReason(); + } + if ( res ) + break; + } + keyPressEvent( k ); + if ( !k->isAccepted() ) + return FALSE; + } + break; + + case QEvent::KeyRelease: + keyReleaseEvent( (QKeyEvent*)e ); + if ( ! ((QKeyEvent*)e)->isAccepted() ) + return FALSE; + break; + + case QEvent::IMStart: { + QIMEvent *i = (QIMEvent *) e; + imStartEvent(i); + if (! i->isAccepted()) + return FALSE; + } + break; + + case QEvent::IMCompose: { + QIMEvent *i = (QIMEvent *) e; + imComposeEvent(i); + if (! i->isAccepted()) + return FALSE; + } + break; + + case QEvent::IMEnd: { + QIMEvent *i = (QIMEvent *) e; + imEndEvent(i); + if (! i->isAccepted()) + return FALSE; + } + break; + + case QEvent::FocusIn: + focusInEvent( (QFocusEvent*)e ); + setFontSys(); + break; + + case QEvent::FocusOut: + focusOutEvent( (QFocusEvent*)e ); + break; + + case QEvent::Enter: + enterEvent( e ); + break; + + case QEvent::Leave: + leaveEvent( e ); + break; + + case QEvent::Paint: + // At this point the event has to be delivered, regardless + // whether the widget isVisible() or not because it + // already went through the filters + paintEvent( (QPaintEvent*)e ); + break; + + case QEvent::Move: + moveEvent( (QMoveEvent*)e ); + break; + + case QEvent::Resize: + resizeEvent( (QResizeEvent*)e ); + break; + + case QEvent::Close: { + QCloseEvent *c = (QCloseEvent *)e; + closeEvent( c ); + if ( !c->isAccepted() ) + return FALSE; + } + break; + + case QEvent::ContextMenu: { + QContextMenuEvent *c = (QContextMenuEvent *)e; + contextMenuEvent( c ); + if ( !c->isAccepted() ) + return FALSE; + } + break; + +#ifndef QT_NO_DRAGANDDROP + case QEvent::Drop: + dropEvent( (QDropEvent*) e); + break; + + case QEvent::DragEnter: + dragEnterEvent( (QDragEnterEvent*) e); + break; + + case QEvent::DragMove: + dragMoveEvent( (QDragMoveEvent*) e); + break; + + case QEvent::DragLeave: + dragLeaveEvent( (QDragLeaveEvent*) e); + break; +#endif + + case QEvent::Show: + showEvent( (QShowEvent*) e); + break; + + case QEvent::Hide: + hideEvent( (QHideEvent*) e); + break; + + case QEvent::ShowWindowRequest: + if ( isShown() ) + showWindow(); + break; + + case QEvent::ParentFontChange: + if ( isTopLevel() ) + break; + // fall through + case QEvent::ApplicationFontChange: + if ( own_font ) + setFont( fnt.resolve( qt_naturalWidgetFont( this ) ) ); + else + unsetFont(); + break; + +#ifndef QT_NO_PALETTE + case QEvent::ParentPaletteChange: + if ( isTopLevel() ) + break; + // fall through + case QEvent::ApplicationPaletteChange: + if ( !own_palette && !isDesktop() ) + unsetPalette(); +# if defined(Q_WS_QWS) && !defined (QT_NO_QWS_MANAGER) + if ( isTopLevel() && topData()->qwsManager ) { + QRegion r( topData()->qwsManager->region() ); + QApplication::postEvent(topData()->qwsManager, new QPaintEvent(r, FALSE) ); + } +# endif + break; +#endif + + case QEvent::WindowActivate: + case QEvent::WindowDeactivate: + windowActivationChange( e->type() != QEvent::WindowActivate ); + if ( children() ) { + QObjectListIt it( *children() ); + QObject *o; + while( ( o = it.current() ) != 0 ) { + ++it; + if ( o->isWidgetType() && + ((QWidget*)o)->isVisible() && + !((QWidget*)o)->isTopLevel() ) + QApplication::sendEvent( o, e ); + } + } + break; + + case QEvent::LanguageChange: + case QEvent::LocaleChange: + if ( children() ) { + QObjectListIt it( *children() ); + QObject *o; + while( ( o = it.current() ) != 0 ) { + ++it; + QApplication::sendEvent( o, e ); + } + } + if ( e->type() == QEvent::LanguageChange ) { + int index = metaObject()->findSlot( "languageChange()", TRUE ); + if ( index >= 0 ) + qt_invoke( index, 0 ); + } + update(); + break; +#ifndef QT_NO_LAYOUT + case QEvent::LayoutDirectionChange: + if ( layout() ) { + layout()->activate(); + } else { + QObjectList* llist = queryList( "QLayout", 0, TRUE, TRUE ); + QObjectListIt lit( *llist ); + QLayout *lay; + while ( ( lay = (QLayout*)lit.current() ) != 0 ) { + ++lit; + lay->activate(); + } + delete llist; + } + update(); + break; +#endif + + case QEvent::WindowStateChange: + { + QEvent::Type type; + if (isMinimized()) + type = QEvent::ShowMinimized; + else if (isFullScreen()) + type = QEvent::ShowFullScreen; + else if (isMaximized()) + type = QEvent::ShowMaximized; + else + type = QEvent::ShowNormal; + + QApplication::postEvent(this, new QEvent(type)); + break; + } + + case QEvent::WindowBlocked: + case QEvent::WindowUnblocked: + if ( children() ) { + QObjectListIt it( *children() ); + QObject *o; + while( ( o = it.current() ) != 0 ) { + ++it; + QWidget *w = ::qt_cast<QWidget*>(o); + if (w && !w->testWFlags(Qt::WShowModal)) + QApplication::sendEvent( o, e ); + } + } + break; + + default: + return FALSE; + } + return TRUE; +} + +/*! + This event handler, for event \a e, can be reimplemented in a + subclass to receive mouse move events for the widget. + + If mouse tracking is switched off, mouse move events only occur if + a mouse button is pressed while the mouse is being moved. If mouse + tracking is switched on, mouse move events occur even if no mouse + button is pressed. + + QMouseEvent::pos() reports the position of the mouse cursor, + relative to this widget. For press and release events, the + position is usually the same as the position of the last mouse + move event, but it might be different if the user's hand shakes. + This is a feature of the underlying window system, not Qt. + + \sa setMouseTracking(), mousePressEvent(), mouseReleaseEvent(), + mouseDoubleClickEvent(), event(), QMouseEvent +*/ + +void QWidget::mouseMoveEvent( QMouseEvent * e) +{ + e->ignore(); +} + +/*! + This event handler, for event \a e, can be reimplemented in a + subclass to receive mouse press events for the widget. + + If you create new widgets in the mousePressEvent() the + mouseReleaseEvent() may not end up where you expect, depending on + the underlying window system (or X11 window manager), the widgets' + location and maybe more. + + The default implementation implements the closing of popup widgets + when you click outside the window. For other widget types it does + nothing. + + \sa mouseReleaseEvent(), mouseDoubleClickEvent(), + mouseMoveEvent(), event(), QMouseEvent +*/ + +void QWidget::mousePressEvent( QMouseEvent *e ) +{ + e->ignore(); + if ( isPopup() ) { + e->accept(); + QWidget* w; + while ( (w = qApp->activePopupWidget() ) && w != this ){ + w->close(); + if (qApp->activePopupWidget() == w) // widget does not want to dissappear + w->hide(); // hide at least + } + if (!rect().contains(e->pos()) ){ + close(); + } + } +} + +/*! + This event handler, for event \a e, can be reimplemented in a + subclass to receive mouse release events for the widget. + + \sa mouseReleaseEvent(), mouseDoubleClickEvent(), + mouseMoveEvent(), event(), QMouseEvent +*/ + +void QWidget::mouseReleaseEvent( QMouseEvent * e ) +{ + e->ignore(); +} + +/*! + This event handler, for event \a e, can be reimplemented in a + subclass to receive mouse double click events for the widget. + + The default implementation generates a normal mouse press event. + + Note that the widgets gets a mousePressEvent() and a + mouseReleaseEvent() before the mouseDoubleClickEvent(). + + \sa mousePressEvent(), mouseReleaseEvent() mouseMoveEvent(), + event(), QMouseEvent +*/ + +void QWidget::mouseDoubleClickEvent( QMouseEvent *e ) +{ + mousePressEvent( e ); // try mouse press event +} + +#ifndef QT_NO_WHEELEVENT +/*! + This event handler, for event \a e, can be reimplemented in a + subclass to receive wheel events for the widget. + + If you reimplement this handler, it is very important that you + \link QWheelEvent ignore()\endlink the event if you do not handle + it, so that the widget's parent can interpret it. + + The default implementation ignores the event. + + \sa QWheelEvent::ignore(), QWheelEvent::accept(), event(), + QWheelEvent +*/ + +void QWidget::wheelEvent( QWheelEvent *e ) +{ + e->ignore(); +} +#endif + +/*! + This event handler, for event \a e, can be reimplemented in a + subclass to receive tablet events for the widget. + + If you reimplement this handler, it is very important that you + \link QTabletEvent ignore()\endlink the event if you do not handle + it, so that the widget's parent can interpret it. + + The default implementation ignores the event. + + \sa QTabletEvent::ignore(), QTabletEvent::accept(), event(), + QTabletEvent +*/ + +void QWidget::tabletEvent( QTabletEvent *e ) +{ + e->ignore(); +} + +/*! + This event handler, for event \a e, can be reimplemented in a + subclass to receive key press events for the widget. + + A widget must call setFocusPolicy() to accept focus initially and + have focus in order to receive a key press event. + + If you reimplement this handler, it is very important that you + explicitly \link QKeyEvent::ignore() ignore\endlink the event + if you do not understand it, so that the widget's parent can + interpret it; otherwise, the event will be implicitly accepted. + Although top-level widgets are able to choose whether to accept + or ignore unknown events because they have no parent widgets that + could otherwise handle them, it is good practice to explicitly + ignore events to make widgets as reusable as possible. + + The default implementation closes popup widgets if the user + presses <b>Esc</b>. Otherwise the event is ignored. + + \sa keyReleaseEvent(), QKeyEvent::ignore(), setFocusPolicy(), + focusInEvent(), focusOutEvent(), event(), QKeyEvent +*/ + +void QWidget::keyPressEvent( QKeyEvent *e ) +{ + if ( isPopup() && e->key() == Key_Escape ) { + e->accept(); + close(); + } else { + e->ignore(); + } +} + +/*! + This event handler, for event \a e, can be reimplemented in a + subclass to receive key release events for the widget. + + A widget must \link setFocusPolicy() accept focus\endlink + initially and \link hasFocus() have focus\endlink in order to + receive a key release event. + + If you reimplement this handler, it is very important that you + \link QKeyEvent ignore()\endlink the release if you do not + understand it, so that the widget's parent can interpret it. + + The default implementation ignores the event. + + \sa keyPressEvent(), QKeyEvent::ignore(), setFocusPolicy(), + focusInEvent(), focusOutEvent(), event(), QKeyEvent +*/ + +void QWidget::keyReleaseEvent( QKeyEvent *e ) +{ + e->ignore(); +} + +/*! + This event handler can be reimplemented in a subclass to receive + keyboard focus events (focus received) for the widget. + + A widget normally must setFocusPolicy() to something other than + \c NoFocus in order to receive focus events. (Note that the + application programmer can call setFocus() on any widget, even + those that do not normally accept focus.) + + The default implementation updates the widget (except for toplevel + widgets that do not specify a focusPolicy() ). It also calls + setMicroFocusHint(), hinting any system-specific input tools about + the focus of the user's attention. + + \sa focusOutEvent(), setFocusPolicy(), keyPressEvent(), + keyReleaseEvent(), event(), QFocusEvent +*/ + +void QWidget::focusInEvent( QFocusEvent * ) +{ + if ( focusPolicy() != NoFocus || !isTopLevel() ) { + update(); + if ( testWState(WState_AutoMask) ) + updateMask(); + setMicroFocusHint(width()/2, 0, 1, height(), FALSE); + } +} + +/*! + This event handler can be reimplemented in a subclass to receive + keyboard focus events (focus lost) for the widget. + + A widget normally must setFocusPolicy() to something other than + \c NoFocus in order to receive focus events. (Note that the + application programmer can call setFocus() on any widget, even + those that do not normally accept focus.) + + The default implementation updates the widget (except for toplevel + widgets that do not specify a focusPolicy() ). It also calls + setMicroFocusHint(), hinting any system-specific input tools about + the focus of the user's attention. + + \sa focusInEvent(), setFocusPolicy(), keyPressEvent(), + keyReleaseEvent(), event(), QFocusEvent +*/ + +void QWidget::focusOutEvent( QFocusEvent * ) +{ + if ( focusPolicy() != NoFocus || !isTopLevel() ){ + update(); + if ( testWState(WState_AutoMask) ) + updateMask(); + } +} + +/*! + \property QWidget::microFocusHint + \brief the currently set micro focus hint for this widget. + + See the documentation of setMicroFocusHint() for more information. +*/ +QRect QWidget::microFocusHint() const +{ + if ( !extra || extra->micro_focus_hint.isEmpty() ) + return QRect(width()/2, 0, 1, height() ); + else + return extra->micro_focus_hint; +} + +/*! + This event handler can be reimplemented in a subclass to receive + widget enter events. + + An event is sent to the widget when the mouse cursor enters the + widget. + + \sa leaveEvent(), mouseMoveEvent(), event() +*/ + +void QWidget::enterEvent( QEvent * ) +{ +} + +/*! + This event handler can be reimplemented in a subclass to receive + widget leave events. + + A leave event is sent to the widget when the mouse cursor leaves + the widget. + + \sa enterEvent(), mouseMoveEvent(), event() +*/ + +void QWidget::leaveEvent( QEvent * ) +{ +} + +/*! + This event handler can be reimplemented in a subclass to receive + paint events. + + A paint event is a request to repaint all or part of the widget. + It can happen as a result of repaint() or update(), or because the + widget was obscured and has now been uncovered, or for many other + reasons. + + Many widgets can simply repaint their entire surface when asked + to, but some slow widgets need to optimize by painting only the + requested region: QPaintEvent::region(). This speed optimization + does not change the result, as painting is clipped to that region + during event processing. QListView and QCanvas do this, for + example. + + Qt also tries to speed up painting by merging multiple paint + events into one. When update() is called several times or the + window system sends several paint events, Qt merges these events + into one event with a larger region (see QRegion::unite()). + repaint() does not permit this optimization, so we suggest using + update() when possible. + + When the paint event occurs, the update region has normally been + erased, so that you're painting on the widget's background. There + are a couple of exceptions and QPaintEvent::erased() tells you + whether the widget has been erased or not. + + The background can be set using setBackgroundMode(), + setPaletteBackgroundColor() or setBackgroundPixmap(). The + documentation for setBackgroundMode() elaborates on the + background; we recommend reading it. + + \sa event(), repaint(), update(), QPainter, QPixmap, QPaintEvent +*/ + +void QWidget::paintEvent( QPaintEvent * ) +{ +} + + +/*! + This event handler can be reimplemented in a subclass to receive + widget move events. When the widget receives this event, it is + already at the new position. + + The old position is accessible through QMoveEvent::oldPos(). + + \sa resizeEvent(), event(), move(), QMoveEvent +*/ + +void QWidget::moveEvent( QMoveEvent * ) +{ +} + + +/*! + This event handler can be reimplemented in a subclass to receive + widget resize events. When resizeEvent() is called, the widget + already has its new geometry. The old size is accessible through + QResizeEvent::oldSize(). + + The widget will be erased and receive a paint event immediately + after processing the resize event. No drawing need be (or should + be) done inside this handler. + + Widgets that have been created with the \c WNoAutoErase flag + will not be erased. Nevertheless, they will receive a paint event + for their entire area afterwards. Again, no drawing needs to be + done inside this handler. + + The default implementation calls updateMask() if the widget has + \link QWidget::setAutoMask() automatic masking\endlink enabled. + + \sa moveEvent(), event(), resize(), QResizeEvent, paintEvent() +*/ + +void QWidget::resizeEvent( QResizeEvent * ) +{ + if ( testWState(WState_AutoMask) ) + updateMask(); +} + +/*! + This event handler, for event \a e, can be reimplemented in a + subclass to receive widget close events. + + The default implementation calls e->accept(), which hides this + widget. See the \l QCloseEvent documentation for more details. + + \sa event(), hide(), close(), QCloseEvent +*/ + +void QWidget::closeEvent( QCloseEvent *e ) +{ + e->accept(); +} + + +/*! + This event handler, for event \a e, can be reimplemented in a + subclass to receive widget context menu events. + + The default implementation calls e->ignore(), which rejects the + context event. See the \l QContextMenuEvent documentation for + more details. + + \sa event(), QContextMenuEvent +*/ + +void QWidget::contextMenuEvent( QContextMenuEvent *e ) +{ + e->ignore(); +} + + +/*! + This event handler, for event \a e, can be reimplemented in a + subclass to receive Input Method composition events. This handler + is called when the user begins entering text using an Input Method. + + The default implementation calls e->ignore(), which rejects the + Input Method event. See the \l QIMEvent documentation for more + details. + + \sa event(), QIMEvent +*/ +void QWidget::imStartEvent( QIMEvent *e ) +{ + e->ignore(); +} + +/*! + This event handler, for event \a e, can be reimplemented in a + subclass to receive Input Method composition events. This handler + is called when the user has entered some text using an Input Method. + + The default implementation calls e->ignore(), which rejects the + Input Method event. See the \l QIMEvent documentation for more + details. + + \sa event(), QIMEvent +*/ +void QWidget::imComposeEvent( QIMEvent *e ) +{ + e->ignore(); +} + + +/*! + This event handler, for event \a e, can be reimplemented in a + subclass to receive Input Method composition events. This handler + is called when the user has finished inputting text via an Input + Method. + + The default implementation calls e->ignore(), which rejects the + Input Method event. See the \l QIMEvent documentation for more + details. + + \sa event(), QIMEvent +*/ +void QWidget::imEndEvent( QIMEvent *e ) +{ + e->ignore(); +} + + +#ifndef QT_NO_DRAGANDDROP + +/*! + This event handler is called when a drag is in progress and the + mouse enters this widget. + + See the \link dnd.html Drag-and-drop documentation\endlink for an + overview of how to provide drag-and-drop in your application. + + \sa QTextDrag, QImageDrag, QDragEnterEvent +*/ +void QWidget::dragEnterEvent( QDragEnterEvent * ) +{ +} + +/*! + This event handler is called when a drag is in progress and the + mouse enters this widget, and whenever it moves within the widget. + + See the \link dnd.html Drag-and-drop documentation\endlink for an + overview of how to provide drag-and-drop in your application. + + \sa QTextDrag, QImageDrag, QDragMoveEvent +*/ +void QWidget::dragMoveEvent( QDragMoveEvent * ) +{ +} + +/*! + This event handler is called when a drag is in progress and the + mouse leaves this widget. + + See the \link dnd.html Drag-and-drop documentation\endlink for an + overview of how to provide drag-and-drop in your application. + + \sa QTextDrag, QImageDrag, QDragLeaveEvent +*/ +void QWidget::dragLeaveEvent( QDragLeaveEvent * ) +{ +} + +/*! + This event handler is called when the drag is dropped on this + widget. + + See the \link dnd.html Drag-and-drop documentation\endlink for an + overview of how to provide drag-and-drop in your application. + + \sa QTextDrag, QImageDrag, QDropEvent +*/ +void QWidget::dropEvent( QDropEvent * ) +{ +} + +#endif // QT_NO_DRAGANDDROP + +/*! + This event handler can be reimplemented in a subclass to receive + widget show events. + + Non-spontaneous show events are sent to widgets immediately before + they are shown. The spontaneous show events of top-level widgets + are delivered afterwards. + + \sa event(), QShowEvent +*/ +void QWidget::showEvent( QShowEvent * ) +{ +} + +/*! + This event handler can be reimplemented in a subclass to receive + widget hide events. + + Hide events are sent to widgets immediately after they have been + hidden. + + \sa event(), QHideEvent +*/ +void QWidget::hideEvent( QHideEvent * ) +{ +} + +/* + \fn QWidget::x11Event( MSG * ) + + This special event handler can be reimplemented in a subclass to + receive native X11 events. + + In your reimplementation of this function, if you want to stop the + event being handled by Qt, return TRUE. If you return FALSE, this + native event is passed back to Qt, which translates the event into + a Qt event and sends it to the widget. + + \warning This function is not portable. + + \sa QApplication::x11EventFilter() +*/ + + +#if defined(Q_WS_MAC) + +/*! + This special event handler can be reimplemented in a subclass to + receive native Macintosh events. + + In your reimplementation of this function, if you want to stop the + event being handled by Qt, return TRUE. If you return FALSE, this + native event is passed back to Qt, which translates the event into + a Qt event and sends it to the widget. + + \warning This function is not portable. + + \sa QApplication::macEventFilter() +*/ + +bool QWidget::macEvent( MSG * ) +{ + return FALSE; +} + +#endif +#if defined(Q_WS_WIN) + +/*! + This special event handler can be reimplemented in a subclass to + receive native Windows events. + + In your reimplementation of this function, if you want to stop the + event being handled by Qt, return TRUE. If you return FALSE, this + native event is passed back to Qt, which translates the event into + a Qt event and sends it to the widget. + + \warning This function is not portable. + + \sa QApplication::winEventFilter() +*/ +bool QWidget::winEvent( MSG * ) +{ + return FALSE; +} + +#endif +#if defined(Q_WS_X11) + +/*! + This special event handler can be reimplemented in a subclass to + receive native X11 events. + + In your reimplementation of this function, if you want to stop the + event being handled by Qt, return TRUE. If you return FALSE, this + native event is passed back to Qt, which translates the event into + a Qt event and sends it to the widget. + + \warning This function is not portable. + + \sa QApplication::x11EventFilter() +*/ +bool QWidget::x11Event( XEvent * ) +{ + return FALSE; +} + +#endif +#if defined(Q_WS_QWS) + +/*! + This special event handler can be reimplemented in a subclass to + receive native Qt/Embedded events. + + In your reimplementation of this function, if you want to stop the + event being handled by Qt, return TRUE. If you return FALSE, this + native event is passed back to Qt, which translates the event into + a Qt event and sends it to the widget. + + \warning This function is not portable. + + \sa QApplication::qwsEventFilter() +*/ +bool QWidget::qwsEvent( QWSEvent * ) +{ + return FALSE; +} + +#endif + +/*! + \property QWidget::autoMask + \brief whether the auto mask feature is enabled for the widget + + Transparent widgets use a mask to define their visible region. + QWidget has some built-in support to make the task of + recalculating the mask easier. When setting auto mask to TRUE, + updateMask() will be called whenever the widget is resized or + changes its focus state. Note that you must reimplement + updateMask() (which should include a call to setMask()) or nothing + will happen. + + Note: when you re-implement resizeEvent(), focusInEvent() or + focusOutEvent() in your custom widgets and still want to ensure + that the auto mask calculation works, you should add: + + \code + if ( autoMask() ) + updateMask(); + \endcode + + at the end of your event handlers. This is true for all member + functions that change the appearance of the widget in a way that + requires a recalculation of the mask. + + While being a technically appealing concept, masks have a big + drawback: when using complex masks that cannot be expressed easily + with relatively simple regions, they can be very slow on some + window systems. The classic example is a transparent label. The + complex shape of its contents makes it necessary to represent its + mask by a bitmap, which consumes both memory and time. If all you + want is to blend the background of several neighboring widgets + together seamlessly, you will probably want to use + setBackgroundOrigin() rather than a mask. + + \sa autoMask() updateMask() setMask() clearMask() setBackgroundOrigin() +*/ + +bool QWidget::autoMask() const +{ + return testWState(WState_AutoMask); +} + +void QWidget::setAutoMask( bool enable ) +{ + if ( enable == autoMask() ) + return; + + if ( enable ) { + setWState(WState_AutoMask); + updateMask(); + } else { + clearWState(WState_AutoMask); + clearMask(); + } +} + +/*! + \enum QWidget::BackgroundOrigin + + This enum defines the origin used to draw a widget's background + pixmap. + + The pixmap is drawn using the: + \value WidgetOrigin widget's coordinate system. + \value ParentOrigin parent's coordinate system. + \value WindowOrigin top-level window's coordinate system. + \value AncestorOrigin same origin as the parent uses. +*/ + +/*! + \property QWidget::backgroundOrigin + \brief the origin of the widget's background + + The origin is either WidgetOrigin (the default), ParentOrigin, + WindowOrigin or AncestorOrigin. + + This only makes a difference if the widget has a background + pixmap, in which case positioning matters. Using \c WindowOrigin + for several neighboring widgets makes the background blend + together seamlessly. \c AncestorOrigin allows blending backgrounds + seamlessly when an ancestor of the widget has an origin other than + \c WindowOrigin. + + \sa backgroundPixmap(), setBackgroundMode() +*/ +QWidget::BackgroundOrigin QWidget::backgroundOrigin() const +{ + return extra ? (BackgroundOrigin)extra->bg_origin : WidgetOrigin; +} + +void QWidget::setBackgroundOrigin( BackgroundOrigin origin ) +{ + if ( origin == backgroundOrigin() ) + return; + createExtra(); + extra->bg_origin = origin; + update(); +} + +/*! + This function can be reimplemented in a subclass to support + transparent widgets. It should be called whenever a widget changes + state in a way that means that the shape mask must be recalculated. + + \sa setAutoMask(), updateMask(), setMask(), clearMask() +*/ +void QWidget::updateMask() +{ +} + +/*! + \internal + Returns the offset of the widget from the backgroundOrigin. + + \sa setBackgroundMode(), backgroundMode(), +*/ +QPoint QWidget::backgroundOffset() const +{ + if (!isTopLevel()) { + switch(backgroundOrigin()) { + case WidgetOrigin: + break; + case ParentOrigin: + return pos(); + case WindowOrigin: + { + const QWidget *topl = this; + while(topl && !topl->isTopLevel() && !topl->testWFlags(Qt::WSubWindow)) + topl = topl->parentWidget(TRUE); + return mapTo((QWidget *)topl, QPoint(0, 0) ); + } + case AncestorOrigin: + { + const QWidget *topl = this; + bool ancestorIsWindowOrigin = FALSE; + while(topl && !topl->isTopLevel() && !topl->testWFlags(Qt::WSubWindow)) + { + if (!ancestorIsWindowOrigin) { + if (topl->backgroundOrigin() == QWidget::WidgetOrigin) + break; + if (topl->backgroundOrigin() == QWidget::ParentOrigin) + { + topl = topl->parentWidget(TRUE); + break; + } + if (topl->backgroundOrigin() == QWidget::WindowOrigin) + ancestorIsWindowOrigin = TRUE; + } + topl = topl->parentWidget(TRUE); + } + + return mapTo((QWidget *) topl, QPoint(0,0) ); + } + } + } + // fall back + return QPoint(0,0); +} + +/*! + \fn QLayout* QWidget::layout () const + + Returns the layout engine that manages the geometry of this + widget's children. + + If the widget does not have a layout, layout() returns 0. + + \sa sizePolicy() +*/ + + +/* Sets this widget to use layout \a l to manage the geometry of its + children. + + If the widget already had a layout, the old layout is + forgotten. (Note that it is not deleted.) + + \sa layout() QLayout sizePolicy() +*/ +#ifndef QT_NO_LAYOUT +void QWidget::setLayout( QLayout *l ) +{ + lay_out = l; +} +#endif + +/*! + \property QWidget::sizePolicy + \brief the default layout behavior of the widget + + If there is a QLayout that manages this widget's children, the + size policy specified by that layout is used. If there is no such + QLayout, the result of this function is used. + + The default policy is Preferred/Preferred, which means that the + widget can be freely resized, but prefers to be the size + sizeHint() returns. Button-like widgets set the size policy to + specify that they may stretch horizontally, but are fixed + vertically. The same applies to lineedit controls (such as + QLineEdit, QSpinBox or an editable QComboBox) and other + horizontally orientated widgets (such as QProgressBar). + QToolButton's are normally square, so they allow growth in both + directions. Widgets that support different directions (such as + QSlider, QScrollBar or QHeader) specify stretching in the + respective direction only. Widgets that can provide scrollbars + (usually subclasses of QScrollView) tend to specify that they can + use additional space, and that they can make do with less than + sizeHint(). + + \sa sizeHint() QLayout QSizePolicy updateGeometry() +*/ +QSizePolicy QWidget::sizePolicy() const +{ + return extra ? extra->size_policy + : QSizePolicy( QSizePolicy::Preferred, QSizePolicy::Preferred ); +} + +void QWidget::setSizePolicy( QSizePolicy policy ) +{ + setWState( WState_OwnSizePolicy ); + if ( policy == sizePolicy() ) + return; + createExtra(); + extra->size_policy = policy; + updateGeometry(); +} + +/*! + \overload void QWidget::setSizePolicy( QSizePolicy::SizeType hor, QSizePolicy::SizeType ver, bool hfw ) + + Sets the size policy of the widget to \a hor, \a ver and \a hfw + (height for width). + + \sa QSizePolicy::QSizePolicy() +*/ + +/*! + Returns the preferred height for this widget, given the width \a + w. The default implementation returns 0, indicating that the + preferred height does not depend on the width. + + \warning Does not look at the widget's layout. +*/ + +int QWidget::heightForWidth( int w ) const +{ + (void)w; + return 0; +} + +/*! + \property QWidget::customWhatsThis + \brief whether the widget wants to handle What's This help manually + + The default implementation of customWhatsThis() returns FALSE, + which means the widget will not receive any events in Whats This + mode. + + The widget may leave What's This mode by calling + QWhatsThis::leaveWhatsThisMode(), with or without actually + displaying any help text. + + You can also reimplement customWhatsThis() if your widget is a + "passive interactor" supposed to work under all circumstances. + Simply don't call QWhatsThis::leaveWhatsThisMode() in that case. + + \sa QWhatsThis::inWhatsThisMode() QWhatsThis::leaveWhatsThisMode() +*/ +bool QWidget::customWhatsThis() const +{ + return FALSE; +} + +/*! + Returns the visible child widget at pixel position \a (x, y) in + the widget's own coordinate system. + + If \a includeThis is TRUE, and there is no child visible at \a (x, + y), the widget itself is returned. +*/ +QWidget *QWidget::childAt( int x, int y, bool includeThis ) const +{ + if ( !rect().contains( x, y ) ) + return 0; + if ( children() ) { + QObjectListIt it( *children() ); + it.toLast(); + QWidget *w, *t; + while( (w=(QWidget *)it.current()) != 0 ) { + --it; + if ( w->isWidgetType() && !w->isTopLevel() && !w->isHidden() ) { + if ( ( t = w->childAt( x - w->x(), y - w->y(), TRUE ) ) ) + return t; + } + } + } + if ( includeThis ) + return (QWidget*)this; + return 0; +} + +/*! + \overload + + Returns the visible child widget at point \a p in the widget's own + coordinate system. + + If \a includeThis is TRUE, and there is no child visible at \a p, + the widget itself is returned. + +*/ +QWidget *QWidget::childAt( const QPoint & p, bool includeThis ) const +{ + return childAt( p.x(), p.y(), includeThis ); +} + + +/*! + Notifies the layout system that this widget has changed and may + need to change geometry. + + Call this function if the sizeHint() or sizePolicy() have changed. + + For explicitly hidden widgets, updateGeometry() is a no-op. The + layout system will be notified as soon as the widget is shown. +*/ + +void QWidget::updateGeometry() +{ + if ( !isTopLevel() && isShown() ) + QApplication::postEvent( parentWidget(), + new QEvent( QEvent::LayoutHint ) ); +} + + +/*! + Reparents the widget. The widget gets a new \a parent, new widget + flags (\a f, but as usual, use 0) at a new position in its new + parent (\a p). + + If \a showIt is TRUE, show() is called once the widget has been + reparented. + + If the new parent widget is in a different top-level widget, the + reparented widget and its children are appended to the end of the + \link setFocusPolicy() tab chain \endlink of the new parent + widget, in the same internal order as before. If one of the moved + widgets had keyboard focus, reparent() calls clearFocus() for that + widget. + + If the new parent widget is in the same top-level widget as the + old parent, reparent doesn't change the tab order or keyboard + focus. + + \warning It is extremely unlikely that you will ever need this + function. If you have a widget that changes its content + dynamically, it is far easier to use \l QWidgetStack or \l + QWizard. + + \sa getWFlags() +*/ + +void QWidget::reparent( QWidget *parent, WFlags f, const QPoint &p, + bool showIt ) +{ + reparentSys( parent, f, p, showIt ); + QEvent e( QEvent::Reparent ); + QApplication::sendEvent( this, &e ); + if (!own_font) + unsetFont(); + else + setFont( fnt.resolve( qt_naturalWidgetFont( this ) ) ); +#ifndef QT_NO_PALETTE + if (!own_palette) + unsetPalette(); +#endif +} + +/*! + \overload + + A convenience version of reparent that does not take widget flags + as argument. + + Calls reparent(\a parent, getWFlags() \& ~\l WType_Mask, \a p, \a + showIt). +*/ +void QWidget::reparent( QWidget *parent, const QPoint & p, + bool showIt ) +{ + reparent( parent, getWFlags() & ~WType_Mask, p, showIt ); +} + +/*! + \property QWidget::ownCursor + \brief whether the widget uses its own cursor + + If FALSE, the widget uses its parent widget's cursor. + + \sa cursor +*/ + +/*! + \property QWidget::ownFont + \brief whether the widget uses its own font + + If FALSE, the widget uses its parent widget's font. + + \sa font +*/ + +/*! + \property QWidget::ownPalette + \brief whether the widget uses its own palette + + If FALSE, the widget uses its parent widget's palette. + + \sa palette +*/ + + +void QWidget::repaint( bool erase ) +{ + repaint( visibleRect(), erase ); +} + + + + +/*!\obsolete Use paletteBackgroundColor() or eraseColor() instead. */ +const QColor & QWidget::backgroundColor() const { return eraseColor(); } +/*!\obsolete Use setPaletteBackgroundColor() or setEraseColor() instead. */ +void QWidget::setBackgroundColor( const QColor &c ) { setEraseColor( c ); } +/*!\obsolete Use paletteBackgroundPixmap() or erasePixmap() instead. */ +const QPixmap *QWidget::backgroundPixmap() const { return erasePixmap(); } +/*!\obsolete Use setPaletteBackgroundPixmap() or setErasePixmap() instead. */ +void QWidget::setBackgroundPixmap( const QPixmap &pm ) { setErasePixmap( pm ); } + + +// documentation in qdesktopwidget_win.cpp +void QDesktopWidget::insertChild( QObject *obj ) +{ + if ( obj->isWidgetType() ) + return; + QWidget::insertChild( obj ); +} + +/*! + \property QWidget::windowOpacity + + \brief The level of opacity for the window. + + The valid range of opacity is from 1.0 (completely opaque) to + 0.0 (completely transparent). + + By default the value of this property is 1.0. + + This feature is only present on Mac OS X and Windows 2000 and up. + + \warning Changing this property from opaque to transparent might issue a + paint event that needs to be processed before the window is displayed + correctly. This affects mainly the use of QPixmap::grabWindow(). Also note + that semi-transparent windows update and resize significantely slower than + opaque windows. +*/ |