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This example demonstrates a menu bar with pull-down menus, sub-menus and custom menu items. It also demonstrates a pop-up context menu.
Header file:
/**************************************************************************** ** $Id: qt/menu.h 3.3.8 edited Jan 11 14:37 $ ** ** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved. ** ** This file is part of an example program for Qt. This example ** program may be used, distributed and modified without limitation. ** *****************************************************************************/ #ifndef MENU_H #define MENU_H #include <qwidget.h> #include <qmenubar.h> #include <qlabel.h> class MenuExample : public QWidget { Q_OBJECT public: MenuExample( QWidget *parent=0, const char *name=0 ); public slots: void open(); void news(); void save(); void closeDoc(); void undo(); void redo(); void normal(); void bold(); void underline(); void about(); void aboutQt(); void printer(); void file(); void fax(); void printerSetup(); protected: void resizeEvent( QResizeEvent * ); signals: void explain( const QString& ); private: void contextMenuEvent ( QContextMenuEvent * ); QMenuBar *menu; QLabel *label; bool isBold; bool isUnderline; int boldID, underlineID; }; #endif // MENU_H
Implementation:
/**************************************************************************** ** $Id: qt/menu.cpp 3.3.8 edited Jan 11 14:37 $ ** ** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved. ** ** This file is part of an example program for Qt. This example ** program may be used, distributed and modified without limitation. ** *****************************************************************************/ #include "menu.h" #include <qcursor.h> #include <qpopupmenu.h> #include <qapplication.h> #include <qmessagebox.h> #include <qpixmap.h> #include <qpainter.h> /* XPM */ static const char * p1_xpm[] = { "16 16 3 1", " c None", ". c #000000000000", "X c #FFFFFFFF0000", " ", " ", " .... ", " .XXXX. ", " .............. ", " .XXXXXXXXXXXX. ", " .XXXXXXXXXXXX. ", " .XXXXXXXXXXXX. ", " .XXXXXXXXXXXX. ", " .XXXXXXXXXXXX. ", " .XXXXXXXXXXXX. ", " .XXXXXXXXXXXX. ", " .XXXXXXXXXXXX. ", " .XXXXXXXXXXXX. ", " .............. ", " "}; /* XPM */ static const char * p2_xpm[] = { "16 16 3 1", " c None", ". c #000000000000", "X c #FFFFFFFFFFFF", " ", " ...... ", " .XXX.X. ", " .XXX.XX. ", " .XXX.XXX. ", " .XXX..... ", " .XXXXXXX. ", " .XXXXXXX. ", " .XXXXXXX. ", " .XXXXXXX. ", " .XXXXXXX. ", " .XXXXXXX. ", " .XXXXXXX. ", " ......... ", " ", " "}; /* XPM */ static const char * p3_xpm[] = { "16 16 3 1", " c None", ". c #000000000000", "X c #FFFFFFFFFFFF", " ", " ", " ......... ", " ........... ", " ........ .. ", " ........... ", " ........... ", " ........... ", " ........... ", " ...XXXXX... ", " ...XXXXX... ", " ...XXXXX... ", " ...XXXXX... ", " ......... ", " ", " "}; /* Auxiliary class to provide fancy menu items with different fonts. Used for the "bold" and "underline" menu items in the options menu. */ class MyMenuItem : public QCustomMenuItem { public: MyMenuItem( const QString& s, const QFont& f ) : string( s ), font( f ){}; ~MyMenuItem(){} void paint( QPainter* p, const QColorGroup& /*cg*/, bool /*act*/, bool /*enabled*/, int x, int y, int w, int h ) { p->setFont ( font ); p->drawText( x, y, w, h, AlignLeft | AlignVCenter | DontClip | ShowPrefix, string ); } QSize sizeHint() { return QFontMetrics( font ).size( AlignLeft | AlignVCenter | ShowPrefix | DontClip, string ); } private: QString string; QFont font; }; MenuExample::MenuExample( QWidget *parent, const char *name ) : QWidget( parent, name ) { QPixmap p1( p1_xpm ); QPixmap p2( p2_xpm ); QPixmap p3( p3_xpm ); QPopupMenu *print = new QPopupMenu( this ); Q_CHECK_PTR( print ); print->insertTearOffHandle(); print->insertItem( "&Print to printer", this, SLOT(printer()) ); print->insertItem( "Print to &file", this, SLOT(file()) ); print->insertItem( "Print to fa&x", this, SLOT(fax()) ); print->insertSeparator(); print->insertItem( "Printer &Setup", this, SLOT(printerSetup()) ); QPopupMenu *file = new QPopupMenu( this ); Q_CHECK_PTR( file ); file->insertItem( p1, "&Open", this, SLOT(open()), CTRL+Key_O ); file->insertItem( p2, "&New", this, SLOT(news()), CTRL+Key_N ); file->insertItem( p3, "&Save", this, SLOT(save()), CTRL+Key_S ); file->insertItem( "&Close", this, SLOT(closeDoc()), CTRL+Key_W ); file->insertSeparator(); file->insertItem( "&Print", print, CTRL+Key_P ); file->insertSeparator(); file->insertItem( "E&xit", qApp, SLOT(quit()), CTRL+Key_Q ); QPopupMenu *edit = new QPopupMenu( this ); Q_CHECK_PTR( edit ); int undoID = edit->insertItem( "&Undo", this, SLOT(undo()) ); int redoID = edit->insertItem( "&Redo", this, SLOT(redo()) ); edit->setItemEnabled( undoID, FALSE ); edit->setItemEnabled( redoID, FALSE ); QPopupMenu* options = new QPopupMenu( this ); Q_CHECK_PTR( options ); options->insertTearOffHandle(); options->setCaption("Options"); options->insertItem( "&Normal Font", this, SLOT(normal()) ); options->insertSeparator(); options->polish(); // adjust system settings QFont f = options->font(); f.setBold( TRUE ); boldID = options->insertItem( new MyMenuItem( "Bold", f ) ); options->setAccel( CTRL+Key_B, boldID ); options->connectItem( boldID, this, SLOT(bold()) ); f = font(); f.setUnderline( TRUE ); underlineID = options->insertItem( new MyMenuItem( "Underline", f ) ); options->setAccel( CTRL+Key_U, underlineID ); options->connectItem( underlineID, this, SLOT(underline()) ); isBold = FALSE; isUnderline = FALSE; options->setCheckable( TRUE ); QPopupMenu *help = new QPopupMenu( this ); Q_CHECK_PTR( help ); help->insertItem( "&About", this, SLOT(about()), CTRL+Key_H ); help->insertItem( "About &Qt", this, SLOT(aboutQt()) ); // If we used a QMainWindow we could use its built-in menuBar(). menu = new QMenuBar( this ); Q_CHECK_PTR( menu ); menu->insertItem( "&File", file ); menu->insertItem( "&Edit", edit ); menu->insertItem( "&Options", options ); menu->insertSeparator(); menu->insertItem( "&Help", help ); menu->setSeparator( QMenuBar::InWindowsStyle ); QLabel *msg = new QLabel( this ); Q_CHECK_PTR( msg ); msg->setText( "A context menu is available.\n" "Invoke it by right-clicking or by" " pressing the 'context' button." ); msg->setGeometry( 0, height() - 60, width(), 60 ); msg->setAlignment( AlignCenter ); label = new QLabel( this ); Q_CHECK_PTR( label ); label->setGeometry( 20, rect().center().y()-20, width()-40, 40 ); label->setFrameStyle( QFrame::Box | QFrame::Raised ); label->setLineWidth( 1 ); label->setAlignment( AlignCenter ); connect( this, SIGNAL(explain(const QString&)), label, SLOT(setText(const QString&)) ); setMinimumSize( 100, 80 ); setFocusPolicy( QWidget::ClickFocus ); } void MenuExample::contextMenuEvent( QContextMenuEvent * ) { QPopupMenu* contextMenu = new QPopupMenu( this ); Q_CHECK_PTR( contextMenu ); QLabel *caption = new QLabel( "<font color=darkblue><u><b>" "Context Menu</b></u></font>", this ); caption->setAlignment( Qt::AlignCenter ); contextMenu->insertItem( caption ); contextMenu->insertItem( "&New", this, SLOT(news()), CTRL+Key_N ); contextMenu->insertItem( "&Open...", this, SLOT(open()), CTRL+Key_O ); contextMenu->insertItem( "&Save", this, SLOT(save()), CTRL+Key_S ); QPopupMenu *submenu = new QPopupMenu( this ); Q_CHECK_PTR( submenu ); submenu->insertItem( "&Print to printer", this, SLOT(printer()) ); submenu->insertItem( "Print to &file", this, SLOT(file()) ); submenu->insertItem( "Print to fa&x", this, SLOT(fax()) ); contextMenu->insertItem( "&Print", submenu ); contextMenu->exec( QCursor::pos() ); delete contextMenu; } void MenuExample::open() { emit explain( "File/Open selected" ); } void MenuExample::news() { emit explain( "File/New selected" ); } void MenuExample::save() { emit explain( "File/Save selected" ); } void MenuExample::closeDoc() { emit explain( "File/Close selected" ); } void MenuExample::undo() { emit explain( "Edit/Undo selected" ); } void MenuExample::redo() { emit explain( "Edit/Redo selected" ); } void MenuExample::normal() { isBold = FALSE; isUnderline = FALSE; QFont font; label->setFont( font ); menu->setItemChecked( boldID, isBold ); menu->setItemChecked( underlineID, isUnderline ); emit explain( "Options/Normal selected" ); } void MenuExample::bold() { isBold = !isBold; QFont font; font.setBold( isBold ); font.setUnderline( isUnderline ); label->setFont( font ); menu->setItemChecked( boldID, isBold ); emit explain( "Options/Bold selected" ); } void MenuExample::underline() { isUnderline = !isUnderline; QFont font; font.setBold( isBold ); font.setUnderline( isUnderline ); label->setFont( font ); menu->setItemChecked( underlineID, isUnderline ); emit explain( "Options/Underline selected" ); } void MenuExample::about() { QMessageBox::about( this, "Qt Menu Example", "This example demonstrates simple use of Qt menus.\n" "You can cut and paste lines from it to your own\n" "programs." ); } void MenuExample::aboutQt() { QMessageBox::aboutQt( this, "Qt Menu Example" ); } void MenuExample::printer() { emit explain( "File/Printer/Print selected" ); } void MenuExample::file() { emit explain( "File/Printer/Print To File selected" ); } void MenuExample::fax() { emit explain( "File/Printer/Print To Fax selected" ); } void MenuExample::printerSetup() { emit explain( "File/Printer/Printer Setup selected" ); } void MenuExample::resizeEvent( QResizeEvent * ) { label->setGeometry( 20, rect().center().y()-20, width()-40, 40 ); } int main( int argc, char ** argv ) { QApplication a( argc, argv ); MenuExample m; m.setCaption("Qt Examples - Menus"); a.setMainWidget( &m ); m.show(); return a.exec(); }
See also Examples.
Copyright © 2007 Trolltech | Trademarks | Qt 3.3.8
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