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Diffstat (limited to 'qtruby/rubylib/examples/qtscribble/scribble.rb')
| -rw-r--r-- | qtruby/rubylib/examples/qtscribble/scribble.rb | 274 |
1 files changed, 274 insertions, 0 deletions
diff --git a/qtruby/rubylib/examples/qtscribble/scribble.rb b/qtruby/rubylib/examples/qtscribble/scribble.rb new file mode 100644 index 00000000..7c6e1ca5 --- /dev/null +++ b/qtruby/rubylib/examples/qtscribble/scribble.rb @@ -0,0 +1,274 @@ +#!/usr/bin/env ruby -w + + # + # A class that lets the user draw with the mouse. The + # window knows how to redraw itself. + # + +require 'Qt' + + class ScribbleArea < Qt::Widget + + slots "setColor(QColor)", "slotLoad(const QString&)", "slotSave(const QString&)", "slotClearArea()" + + # + # The constructor. Initializes the member variables. + # + def initialize() + super + # initialize member variables + @_buffer = Qt::Pixmap.new() + @_last = Qt::Point.new() + @_currentcolor = black + + # don't blank the window before repainting + setBackgroundMode( NoBackground ) + + # create a pop-up menu + @_popupmenu = Qt::PopupMenu.new() + @_popupmenu.insertItem( "&Clear", self, SLOT( "slotClearArea()" ) ) + end + + # + # This slot sets the curren color for the scribble area. It will be + # connected with the colorChanged( Qt::Color ) signal from the + # ScribbleWindow. + # + def setColor( new_color ) + @_currentcolor = new_color + end + + # + # This slot clears the drawing area by filling the off-screen buffer with + # white and copying it over to the window. + # + def slotClearArea() + # fill the off screen buffer with plain white + @_buffer.fill( white ) + + # and copy it over to the window + bitBlt( self, 0, 0, @_buffer ) + end + + + # + # This method does the actual loading. It relies on Qt::Pixmap (and the + # underlying I/O machinery) to determine the filetype. + # + def slotLoad( filename ) + if !@_buffer.load( filename ) + Qt::MessageBox.warning( nil, "Load error", "Could not load file" ) + end + + repaint() # refresh the window + end + + + # + # This method does the actual saving. We hard-code the file type as + # BMP. Unix users might want to replace this with something like XPM. + # + def slotSave( filename ) + if !@_buffer.save( filename, "BMP" ) + Qt::MessageBox.warning( nil, "Save error", "Could not save file" ) + end + end + + + # + # This method is called whenever the user presses the + # mouse over the window. It just records the position of the mouse + # at the time of the click. + # + def mousePressEvent(event) + if event.button() == RightButton + @_popupmenu.exec( Qt::Cursor.pos() ) + else + @_last = event.pos() # retrieve the coordinates from the event + end + end + + + # + # The method is called whenever the usr moves the mouse + # while the mouse button is pressed. If we had called + # setMouseTracking(true) before, the method would also be called + # when the mouse was moved with any button pressed. We know that + # we haven't, and thus don't have to check whether any buttons are + # pressed. + # + def mouseMoveEvent(event) + # create a Qt::Painter object for drawing onto the window + windowpainter = Qt::Painter.new() + # and another Qt::Painter object for drawing int an off-screen pixmap + bufferpainter = Qt::Painter.new() + + # start painting + windowpainter.begin( self ) # This painter paints onto the window + bufferpainter.begin( @_buffer ) # and this one paints in the buffer + + # set a standard pen with the currently selected color + windowpainter.setPen( @_currentcolor ) + bufferpainter.setPen( @_currentcolor ) + + # draw a line in both the window and the buffer + windowpainter.drawLine( @_last, event.pos() ) + bufferpainter.drawLine( @_last, event.pos() ) + + # done with painting + windowpainter.end() + bufferpainter.end() + + # remember the current mouse position + @_last = event.pos() + end + + # + # This method is called whenever the widget needs + # painting, for example when it has been obscured and then revealed again. + # + def paintEvent(event) + bitBlt(self, 0, 0, @_buffer) + end + + # + # This method get called whenever the widget needs + # painting, for example, when it has been obscured and then revealed again. + # + def resizeEvent(event) + save = Qt::Pixmap.new( @_buffer ) + @_buffer.resize( event.size() ) + @_buffer.fill( white ) + bitBlt( @_buffer, 0, 0, save ) + end + end + +class ScribbleWindow < Qt::Widget + + slots "slotAbout()", "slotAboutQt()", "slotColorMenu(int)", "slotLoad()", "slotSave()" + signals "colorChanged(QColor)", "load(const QString&)", "save(const QString&)" + + COLOR_MENU_ID_BLACK = 0 + COLOR_MENU_ID_RED = 1 + COLOR_MENU_ID_BLUE = 2 + COLOR_MENU_ID_GREEN = 3 + COLOR_MENU_ID_YELLOW = 4 + + def initialize() + super + # The next lines build the menu bar. We first create the menus + # one by one, then add them to the menu bar. # + @_filemenu = Qt::PopupMenu.new() # create a file menu + @_filemenu.insertItem( "&Load", self, SLOT( "slotLoad()" ) ) + @_filemenu.insertItem( "&Save", self, SLOT( "slotSave()" ) ) + @_filemenu.insertSeparator() + @_filemenu.insertItem( "&Quit", $qApp, SLOT( "quit()" ) ) + + @_colormenu = Qt::PopupMenu.new() # create a color menu + @_colormenu.insertItem( "B&lack", COLOR_MENU_ID_BLACK) + @_colormenu.insertItem( "&Red", COLOR_MENU_ID_RED) + @_colormenu.insertItem( "&Blue", COLOR_MENU_ID_BLUE) + @_colormenu.insertItem( "&Green", COLOR_MENU_ID_GREEN) + @_colormenu.insertItem( "&Yellow", COLOR_MENU_ID_YELLOW) + Qt::Object.connect( @_colormenu, SIGNAL( "activated( int )" ), + self, SLOT( "slotColorMenu( int )" ) ) + + @_helpmenu = Qt::PopupMenu.new() # create a help menu + @_helpmenu.insertItem( "&About QtScribble", self, SLOT( "slotAbout()" ) ) + @_helpmenu.insertItem( "&About Qt", self, SLOT( "slotAboutQt()" ) ) + + @_menubar = Qt::MenuBar.new( self, "" ) # create a menu bar + @_menubar.insertItem( "&File", @_filemenu ) + @_menubar.insertItem( "&Color", @_colormenu ) + @_menubar.insertItem( "&Help", @_helpmenu ) + + # We create a Qt::ScrollView and a ScribbleArea. The ScribbleArea will + # be managed by the scroll view.# + @_scrollview = Qt::ScrollView.new( self ) + @_scrollview.setGeometry( 0, @_menubar.height(), + width(), height() - @_menubar.height() ) + @_scribblearea = ScribbleArea.new() + @_scribblearea.setGeometry( 0, 0, 1000, 1000 ) + @_scrollview.addChild( @_scribblearea ) + Qt::Object.connect( self, SIGNAL( "colorChanged(QColor)" ), + @_scribblearea, SLOT( "setColor(QColor)" ) ) + Qt::Object.connect( self, SIGNAL( "save(const QString&)" ), + @_scribblearea, SLOT( "slotSave(const QString&)" ) ) + Qt::Object.connect( self, SIGNAL( "load(const QString&)" ), + @_scribblearea, SLOT( "slotLoad(const QString&)" ) ) + end + + def resizeEvent( event ) + # When the whole window is resized, we have to rearrange the geometry + # in the ScribbleWindow as well. Note that the ScribbleArea does not need + # to be changed. + @_scrollview.setGeometry( 0, @_menubar.height(), + width(), height() - @_menubar.height() ) + end + + + + def slotAbout() + Qt::MessageBox.information( self, "About QtScribble 5", + "This is the Scribble 5 application\n" + + "Copyright 1998 by Mathias Kalle Dalheimer\n") + end + + def slotAboutQt() + Qt::MessageBox.aboutQt( self, "About Qt" ) + end + + def slotColorMenu( item ) + case item + when COLOR_MENU_ID_BLACK + emit colorChanged( black ) + when COLOR_MENU_ID_RED + emit colorChanged( darkRed ) + when COLOR_MENU_ID_BLUE + emit colorChanged( darkBlue ) + when COLOR_MENU_ID_GREEN + emit colorChanged( darkGreen ) + when COLOR_MENU_ID_YELLOW + emit colorChanged( yellow ) + end + end + + + # + # This is the slot for the menu item File/Load. It opens a + # Qt::FileDialog to ask the user for a filename, then emits a save() + # signal with the filename as parameter. + # + def slotLoad() + # Open a file dialog for loading. The default directory is the + # current directory, the filter *.bmp. + # + filename = Qt::FileDialog.getOpenFileName( ".", "*.bmp", self ) + if !filename.nil? + emit load( filename ) + end + end + + # + # This is the slot for the menu item File/Load. It opens a + # Qt::FileDialog to ask the user for a filename, then emits a save() + # signal with the filename as parameter. + # + def slotSave() + # Open a file dialog for saving. The default directory is the + # current directory, the filter *.bmp. + # + filename = Qt::FileDialog.getSaveFileName( ".", "*.bmp", self ) + if !filename.nil? + emit save( filename ) + end + end +end + +myapp = Qt::Application.new(ARGV) +mywidget = ScribbleWindow.new() +mywidget.setGeometry(50, 500, 400, 400) + +myapp.setMainWidget(mywidget) +mywidget.show() +myapp.exec() |