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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 3.2.0b2 edited May 13 09:08 $
**
** Copyright (C) 1992-2000 Trolltech AS. 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 3.2.0b2 edited May 13 09:08 $
**
** Copyright (C) 1992-2000 Trolltech AS. 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 © 2003 Trolltech | Trademarks | Qt version 3.2.0b2
|