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-'\" t
-.TH QLayoutItem 3qt "2 February 2007" "Trolltech AS" \" -*- nroff -*-
-.\" Copyright 1992-2007 Trolltech ASA. All rights reserved. See the
-.\" license file included in the distribution for a complete license
-.\" statement.
-.\"
-.ad l
-.nh
-.SH NAME
-QLayoutItem \- Abstract item that a QLayout manipulates
-.SH SYNOPSIS
-\fC#include <ntqlayout.h>\fR
-.PP
-Inherited by QLayout, QSpacerItem, and QWidgetItem.
-.PP
-.SS "Public Members"
-.in +1c
-.ti -1c
-.BI "\fBQLayoutItem\fR ( int alignment = 0 )"
-.br
-.ti -1c
-.BI "virtual \fB~QLayoutItem\fR ()"
-.br
-.ti -1c
-.BI "virtual QSize \fBsizeHint\fR () const = 0"
-.br
-.ti -1c
-.BI "virtual QSize \fBminimumSize\fR () const = 0"
-.br
-.ti -1c
-.BI "virtual QSize \fBmaximumSize\fR () const = 0"
-.br
-.ti -1c
-.BI "virtual QSizePolicy::ExpandData \fBexpanding\fR () const = 0"
-.br
-.ti -1c
-.BI "virtual void \fBsetGeometry\fR ( const QRect & r ) = 0"
-.br
-.ti -1c
-.BI "virtual QRect \fBgeometry\fR () const = 0"
-.br
-.ti -1c
-.BI "virtual bool \fBisEmpty\fR () const = 0"
-.br
-.ti -1c
-.BI "virtual bool \fBhasHeightForWidth\fR () const"
-.br
-.ti -1c
-.BI "virtual int \fBheightForWidth\fR ( int w ) const"
-.br
-.ti -1c
-.BI "virtual void \fBinvalidate\fR ()"
-.br
-.ti -1c
-.BI "virtual QWidget * \fBwidget\fR ()"
-.br
-.ti -1c
-.BI "virtual QLayoutIterator \fBiterator\fR ()"
-.br
-.ti -1c
-.BI "virtual QLayout * \fBlayout\fR ()"
-.br
-.ti -1c
-.BI "virtual QSpacerItem * \fBspacerItem\fR ()"
-.br
-.ti -1c
-.BI "int \fBalignment\fR () const"
-.br
-.ti -1c
-.BI "virtual void \fBsetAlignment\fR ( int a )"
-.br
-.in -1c
-.SH DESCRIPTION
-The QLayoutItem class provides an abstract item that a QLayout manipulates.
-.PP
-This is used by custom layouts.
-.PP
-Pure virtual functions are provided to return information about the layout, including, sizeHint(), minimumSize(), maximumSize() and expanding().
-.PP
-The layout's geometry can be set and retrieved with setGeometry() and geometry(), and its alignment with setAlignment() and alignment().
-.PP
-isEmpty() returns whether the layout is empty. iterator() returns an iterator for the layout's children. If the concrete item is a QWidget, it can be retrieved using widget(). Similarly for layout() and spacerItem().
-.PP
-See also QLayout, Widget Appearance and Style, and Layout Management.
-.SH MEMBER FUNCTION DOCUMENTATION
-.SH "QLayoutItem::QLayoutItem ( int alignment = 0 )"
-Constructs a layout item with an \fIalignment\fR that is a bitwise OR of the Qt::AlignmentFlags. Not all subclasses support alignment.
-.SH "QLayoutItem::~QLayoutItem ()\fC [virtual]\fR"
-Destroys the QLayoutItem.
-.SH "int QLayoutItem::alignment () const"
-Returns the alignment of this item.
-.SH "QSizePolicy::ExpandData QLayoutItem::expanding () const\fC [pure virtual]\fR"
-Implemented in subclasses to return the direction(s) this item" wants" to expand in (if any).
-.PP
-Reimplemented in QLayout, QSpacerItem, and QWidgetItem.
-.SH "QRect QLayoutItem::geometry () const\fC [pure virtual]\fR"
-Returns the rectangle covered by this layout item.
-.PP
-Example: customlayout/border.cpp.
-.SH "bool QLayoutItem::hasHeightForWidth () const\fC [virtual]\fR"
-Returns TRUE if this layout's preferred height depends on its width; otherwise returns FALSE. The default implementation returns FALSE.
-.PP
-Reimplement this function in layout managers that support height for width.
-.PP
-See also heightForWidth() and QWidget::heightForWidth().
-.PP
-Examples:
-.)l customlayout/border.cpp and customlayout/flow.cpp.
-.PP
-Reimplemented in QGridLayout and QBoxLayout.
-.SH "int QLayoutItem::heightForWidth ( int w ) const\fC [virtual]\fR"
-Returns the preferred height for this layout item, given the width \fIw\fR.
-.PP
-The default implementation returns -1, indicating that the preferred height is independent of the width of the item. Using the function hasHeightForWidth() will typically be much faster than calling this function and testing for -1.
-.PP
-Reimplement this function in layout managers that support height for width. A typical implementation will look like this:
-.PP
-.nf
-.br
- int MyLayout::heightForWidth( int w ) const
-.br
- {
-.br
- if ( cache_dirty || cached_width != w ) {
-.br
- // not all C++ compilers support "mutable"
-.br
- MyLayout *that = (MyLayout*)this;
-.br
- int h = calculateHeightForWidth( w );
-.br
- that->cached_hfw = h;
-.br
- return h;
-.br
- }
-.br
- return cached_hfw;
-.br
- }
-.br
-.fi
-.PP
-Caching is strongly recommended; without it layout will take exponential time.
-.PP
-See also hasHeightForWidth().
-.PP
-Example: customlayout/flow.cpp.
-.PP
-Reimplemented in QGridLayout and QBoxLayout.
-.SH "void QLayoutItem::invalidate ()\fC [virtual]\fR"
-Invalidates any cached information in this layout item.
-.PP
-Reimplemented in QLayout.
-.SH "bool QLayoutItem::isEmpty () const\fC [pure virtual]\fR"
-Implemented in subclasses to return whether this item is empty, i.e. whether it contains any widgets.
-.PP
-Reimplemented in QLayout, QSpacerItem, and QWidgetItem.
-.SH "QLayoutIterator QLayoutItem::iterator ()\fC [virtual]\fR"
-Returns an iterator over this item's QLayoutItem children. The default implementation returns an empty iterator.
-.PP
-Reimplement this function in subclasses that can have children.
-.PP
-Reimplemented in QLayout.
-.SH "QLayout * QLayoutItem::layout ()\fC [virtual]\fR"
-If this item is a QLayout, it is returned as a QLayout; otherwise 0 is returned. This function provides type-safe casting.
-.SH "QSize QLayoutItem::maximumSize () const\fC [pure virtual]\fR"
-Implemented in subclasses to return the maximum size of this item.
-.PP
-Reimplemented in QLayout, QSpacerItem, and QWidgetItem.
-.SH "QSize QLayoutItem::minimumSize () const\fC [pure virtual]\fR"
-Implemented in subclasses to return the minimum size of this item.
-.PP
-Examples:
-.)l customlayout/border.cpp, customlayout/card.cpp, and customlayout/flow.cpp.
-.PP
-Reimplemented in QLayout, QSpacerItem, and QWidgetItem.
-.SH "void QLayoutItem::setAlignment ( int a )\fC [virtual]\fR"
-Sets the alignment of this item to \fIa\fR, which is a bitwise OR of the Qt::AlignmentFlags. Not all subclasses support alignment.
-.PP
-Example: chart/optionsform.cpp.
-.SH "void QLayoutItem::setGeometry ( const QRect & r )\fC [pure virtual]\fR"
-Implemented in subclasses to set this item's geometry to \fIr\fR.
-.PP
-Examples:
-.)l customlayout/border.cpp, customlayout/card.cpp, and customlayout/flow.cpp.
-.PP
-Reimplemented in QLayout, QSpacerItem, and QWidgetItem.
-.SH "QSize QLayoutItem::sizeHint () const\fC [pure virtual]\fR"
-Implemented in subclasses to return the preferred size of this item.
-.PP
-Examples:
-.)l customlayout/border.cpp, customlayout/card.cpp, and customlayout/flow.cpp.
-.PP
-Reimplemented in QSpacerItem, QWidgetItem, QGridLayout, and QBoxLayout.
-.SH "QSpacerItem * QLayoutItem::spacerItem ()\fC [virtual]\fR"
-If this item is a QSpacerItem, it is returned as a QSpacerItem; otherwise 0 is returned. This function provides type-safe casting.
-.SH "QWidget * QLayoutItem::widget ()\fC [virtual]\fR"
-If this item is a QWidget, it is returned as a QWidget; otherwise 0 is returned. This function provides type-safe casting.
-.PP
-Reimplemented in QWidgetItem.
-
-.SH "SEE ALSO"
-.BR http://doc.trolltech.com/qlayoutitem.html
-.BR http://www.trolltech.com/faq/tech.html
-.SH COPYRIGHT
-Copyright 1992-2007 Trolltech ASA, http://www.trolltech.com. See the
-license file included in the distribution for a complete license
-statement.
-.SH AUTHOR
-Generated automatically from the source code.
-.SH BUGS
-If you find a bug in Qt, please report it as described in
-.BR http://doc.trolltech.com/bughowto.html .
-Good bug reports help us to help you. Thank you.
-.P
-The definitive Qt documentation is provided in HTML format; it is
-located at $QTDIR/doc/html and can be read using Qt Assistant or with
-a web browser. This man page is provided as a convenience for those
-users who prefer man pages, although this format is not officially
-supported by Trolltech.
-.P
-If you find errors in this manual page, please report them to
-.BR qt-bugs@trolltech.com .
-Please include the name of the manual page (qlayoutitem.3qt) and the Qt
-version (3.3.8).