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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Using menus</title>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>Using menus</h1>
<p>
This example demonstrates a menu bar with pull-down menus,
sub-menus and custom menu items. It also demonstrates a pop-up
context menu.
<p> <hr>
<p> Header file:
<p> <pre>/****************************************************************************
** $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 <<a href="qwidget-h.html">qwidget.h</a>>
#include <<a href="qmenubar-h.html">qmenubar.h</a>>
#include <<a href="qlabel-h.html">qlabel.h</a>>
class MenuExample : public <a href="qwidget.html">QWidget</a>
{
<a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
public:
MenuExample( <a href="qwidget.html">QWidget</a> *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( <a href="qresizeevent.html">QResizeEvent</a> * );
signals:
void explain( const <a href="qstring.html">QString</a>& );
private:
void contextMenuEvent ( <a href="qcontextmenuevent.html">QContextMenuEvent</a> * );
<a href="qmenubar.html">QMenuBar</a> *menu;
<a href="qlabel.html">QLabel</a> *label;
bool isBold;
bool isUnderline;
int boldID, underlineID;
};
#endif // MENU_H
</pre>
<p> <hr>
<p> Implementation:
<p> <pre>/****************************************************************************
** $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 <<a href="qcursor-h.html">qcursor.h</a>>
#include <<a href="qpopupmenu-h.html">qpopupmenu.h</a>>
#include <<a href="qapplication-h.html">qapplication.h</a>>
#include <<a href="qmessagebox-h.html">qmessagebox.h</a>>
#include <<a href="qpixmap-h.html">qpixmap.h</a>>
#include <<a href="qpainter-h.html">qpainter.h</a>>
/* 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 <a href="qcustommenuitem.html">QCustomMenuItem</a>
{
public:
MyMenuItem( const <a href="qstring.html">QString</a>& s, const <a href="qfont.html">QFont</a>& f )
: string( s ), font( f ){};
~MyMenuItem(){}
void paint( <a href="qpainter.html">QPainter</a>* p, const QColorGroup& /*cg*/, bool /*act*/, bool /*enabled*/, int x, int y, int w, int h )
{
p-><a href="qpainter.html#setFont">setFont</a> ( font );
p-><a href="qpainter.html#drawText">drawText</a>( x, y, w, h, AlignLeft | AlignVCenter | DontClip | ShowPrefix, string );
}
<a href="qsize.html">QSize</a> sizeHint()
{
return QFontMetrics( font ).size( AlignLeft | AlignVCenter | ShowPrefix | DontClip, string );
}
private:
<a href="qstring.html">QString</a> string;
<a href="qfont.html">QFont</a> font;
};
<a name="f501"></a>MenuExample::MenuExample( <a href="qwidget.html">QWidget</a> *parent, const char *name )
: <a href="qwidget.html">QWidget</a>( parent, name )
{
<a href="qpixmap.html">QPixmap</a> p1( p1_xpm );
<a href="qpixmap.html">QPixmap</a> p2( p2_xpm );
<a href="qpixmap.html">QPixmap</a> p3( p3_xpm );
<a href="qpopupmenu.html">QPopupMenu</a> *print = new <a href="qpopupmenu.html">QPopupMenu</a>( this );
<a href="qapplication.html#Q_CHECK_PTR">Q_CHECK_PTR</a>( print );
<a name="x1879"></a> print-><a href="qpopupmenu.html#insertTearOffHandle">insertTearOffHandle</a>();
<a name="x1869"></a> print-><a href="qmenudata.html#insertItem">insertItem</a>( "&Print to printer", this, SLOT(printer()) );
print-><a href="qmenudata.html#insertItem">insertItem</a>( "Print to &file", this, SLOT(file()) );
print-><a href="qmenudata.html#insertItem">insertItem</a>( "Print to fa&x", this, SLOT(fax()) );
<a name="x1870"></a> print-><a href="qmenudata.html#insertSeparator">insertSeparator</a>();
print-><a href="qmenudata.html#insertItem">insertItem</a>( "Printer &Setup", this, SLOT(printerSetup()) );
<a href="qpopupmenu.html">QPopupMenu</a> *file = new <a href="qpopupmenu.html">QPopupMenu</a>( this );
<a href="qapplication.html#Q_CHECK_PTR">Q_CHECK_PTR</a>( file );
file-><a href="qmenudata.html#insertItem">insertItem</a>( p1, "&Open", this, SLOT(open()), CTRL+Key_O );
file-><a href="qmenudata.html#insertItem">insertItem</a>( p2, "&New", this, SLOT(news()), CTRL+Key_N );
file-><a href="qmenudata.html#insertItem">insertItem</a>( p3, "&Save", this, SLOT(save()), CTRL+Key_S );
file-><a href="qmenudata.html#insertItem">insertItem</a>( "&Close", this, SLOT(closeDoc()), CTRL+Key_W );
file-><a href="qmenudata.html#insertSeparator">insertSeparator</a>();
file-><a href="qmenudata.html#insertItem">insertItem</a>( "&Print", print, CTRL+Key_P );
file-><a href="qmenudata.html#insertSeparator">insertSeparator</a>();
file-><a href="qmenudata.html#insertItem">insertItem</a>( "E&xit", qApp, SLOT(<a href="qapplication.html#quit">quit</a>()), CTRL+Key_Q );
<a href="qpopupmenu.html">QPopupMenu</a> *edit = new <a href="qpopupmenu.html">QPopupMenu</a>( this );
<a href="qapplication.html#Q_CHECK_PTR">Q_CHECK_PTR</a>( edit );
int undoID = edit-><a href="qmenudata.html#insertItem">insertItem</a>( "&Undo", this, SLOT(undo()) );
int redoID = edit-><a href="qmenudata.html#insertItem">insertItem</a>( "&Redo", this, SLOT(redo()) );
<a name="x1873"></a> edit-><a href="qmenudata.html#setItemEnabled">setItemEnabled</a>( undoID, FALSE );
edit-><a href="qmenudata.html#setItemEnabled">setItemEnabled</a>( redoID, FALSE );
<a href="qpopupmenu.html">QPopupMenu</a>* options = new <a href="qpopupmenu.html">QPopupMenu</a>( this );
<a href="qapplication.html#Q_CHECK_PTR">Q_CHECK_PTR</a>( options );
options-><a href="qpopupmenu.html#insertTearOffHandle">insertTearOffHandle</a>();
options-><a href="qwidget.html#setCaption">setCaption</a>("Options");
options-><a href="qmenudata.html#insertItem">insertItem</a>( "&Normal Font", this, SLOT(normal()) );
options-><a href="qmenudata.html#insertSeparator">insertSeparator</a>();
<a name="x1883"></a> options-><a href="qwidget.html#polish">polish</a>(); // adjust system settings
<a name="x1882"></a> <a href="qfont.html">QFont</a> f = options-><a href="qwidget.html#font">font</a>();
<a name="x1860"></a> f.<a href="qfont.html#setBold">setBold</a>( TRUE );
boldID = options-><a href="qmenudata.html#insertItem">insertItem</a>( new MyMenuItem( "Bold", f ) );
<a name="x1871"></a> options-><a href="qmenudata.html#setAccel">setAccel</a>( CTRL+Key_B, boldID );
<a name="x1868"></a> options-><a href="qmenudata.html#connectItem">connectItem</a>( boldID, this, SLOT(bold()) );
f = <a href="qwidget.html#font">font</a>();
<a name="x1861"></a> f.<a href="qfont.html#setUnderline">setUnderline</a>( TRUE );
underlineID = options-><a href="qmenudata.html#insertItem">insertItem</a>( new MyMenuItem( "Underline", f ) );
options-><a href="qmenudata.html#setAccel">setAccel</a>( CTRL+Key_U, underlineID );
options-><a href="qmenudata.html#connectItem">connectItem</a>( underlineID, this, SLOT(underline()) );
isBold = FALSE;
isUnderline = FALSE;
<a name="x1880"></a> options-><a href="qpopupmenu.html#setCheckable">setCheckable</a>( TRUE );
<a href="qpopupmenu.html">QPopupMenu</a> *help = new <a href="qpopupmenu.html">QPopupMenu</a>( this );
<a href="qapplication.html#Q_CHECK_PTR">Q_CHECK_PTR</a>( help );
help-><a href="qmenudata.html#insertItem">insertItem</a>( "&About", this, SLOT(about()), CTRL+Key_H );
help-><a href="qmenudata.html#insertItem">insertItem</a>( "About &Qt", this, SLOT(aboutQt()) );
// If we used a QMainWindow we could use its built-in menuBar().
menu = new <a href="qmenubar.html">QMenuBar</a>( this );
<a href="qapplication.html#Q_CHECK_PTR">Q_CHECK_PTR</a>( menu );
menu-><a href="qmenudata.html#insertItem">insertItem</a>( "&File", file );
menu-><a href="qmenudata.html#insertItem">insertItem</a>( "&Edit", edit );
menu-><a href="qmenudata.html#insertItem">insertItem</a>( "&Options", options );
menu-><a href="qmenudata.html#insertSeparator">insertSeparator</a>();
menu-><a href="qmenudata.html#insertItem">insertItem</a>( "&Help", help );
<a name="x1867"></a> menu-><a href="qmenubar.html#setSeparator">setSeparator</a>( QMenuBar::InWindowsStyle );
<a href="qlabel.html">QLabel</a> *msg = new <a href="qlabel.html">QLabel</a>( this );
<a href="qapplication.html#Q_CHECK_PTR">Q_CHECK_PTR</a>( msg );
msg-><a href="qlabel.html#setText">setText</a>( "A context menu is available.\n"
"Invoke it by right-clicking or by"
" pressing the 'context' button." );
<a name="x1886"></a> msg-><a href="qwidget.html#setGeometry">setGeometry</a>( 0, height() - 60, width(), 60 );
<a name="x1864"></a> msg-><a href="qlabel.html#setAlignment">setAlignment</a>( AlignCenter );
label = new <a href="qlabel.html">QLabel</a>( this );
<a href="qapplication.html#Q_CHECK_PTR">Q_CHECK_PTR</a>( label );
label-><a href="qwidget.html#setGeometry">setGeometry</a>( 20, rect().center().y()-20, width()-40, 40 );
label-><a href="qframe.html#setFrameStyle">setFrameStyle</a>( QFrame::Box | QFrame::Raised );
<a name="x1863"></a> label-><a href="qframe.html#setLineWidth">setLineWidth</a>( 1 );
label-><a href="qlabel.html#setAlignment">setAlignment</a>( AlignCenter );
<a href="qobject.html#connect">connect</a>( this, SIGNAL(explain(const <a href="qstring.html">QString</a>&)),
label, SLOT(<a href="qlabel.html#setText">setText</a>(const <a href="qstring.html">QString</a>&)) );
<a href="qwidget.html#setMinimumSize">setMinimumSize</a>( 100, 80 );
<a href="qwidget.html#setFocusPolicy">setFocusPolicy</a>( QWidget::ClickFocus );
}
<a name="x1881"></a>void MenuExample::<a href="qwidget.html#contextMenuEvent">contextMenuEvent</a>( <a href="qcontextmenuevent.html">QContextMenuEvent</a> * )
{
<a href="qpopupmenu.html">QPopupMenu</a>* contextMenu = new <a href="qpopupmenu.html">QPopupMenu</a>( this );
<a href="qapplication.html#Q_CHECK_PTR">Q_CHECK_PTR</a>( contextMenu );
<a href="qlabel.html">QLabel</a> *caption = new <a href="qlabel.html">QLabel</a>( "<font color=darkblue><u><b>"
"Context Menu</b></u></font>", this );
caption-><a href="qlabel.html#setAlignment">setAlignment</a>( Qt::AlignCenter );
contextMenu-><a href="qmenudata.html#insertItem">insertItem</a>( caption );
contextMenu-><a href="qmenudata.html#insertItem">insertItem</a>( "&New", this, SLOT(news()), CTRL+Key_N );
contextMenu-><a href="qmenudata.html#insertItem">insertItem</a>( "&Open...", this, SLOT(open()), CTRL+Key_O );
contextMenu-><a href="qmenudata.html#insertItem">insertItem</a>( "&Save", this, SLOT(save()), CTRL+Key_S );
<a href="qpopupmenu.html">QPopupMenu</a> *submenu = new <a href="qpopupmenu.html">QPopupMenu</a>( this );
<a href="qapplication.html#Q_CHECK_PTR">Q_CHECK_PTR</a>( submenu );
submenu-><a href="qmenudata.html#insertItem">insertItem</a>( "&Print to printer", this, SLOT(printer()) );
submenu-><a href="qmenudata.html#insertItem">insertItem</a>( "Print to &file", this, SLOT(file()) );
submenu-><a href="qmenudata.html#insertItem">insertItem</a>( "Print to fa&x", this, SLOT(fax()) );
contextMenu-><a href="qmenudata.html#insertItem">insertItem</a>( "&Print", submenu );
<a name="x1878"></a><a name="x1859"></a> contextMenu-><a href="qpopupmenu.html#exec">exec</a>( QCursor::<a href="qcursor.html#pos">pos</a>() );
delete contextMenu;
}
void <a name="f502"></a>MenuExample::open()
{
emit explain( "File/Open selected" );
}
void <a name="f503"></a>MenuExample::news()
{
emit explain( "File/New selected" );
}
void <a name="f504"></a>MenuExample::save()
{
emit explain( "File/Save selected" );
}
void <a name="f505"></a>MenuExample::closeDoc()
{
emit explain( "File/Close selected" );
}
void <a name="f506"></a>MenuExample::undo()
{
emit explain( "Edit/Undo selected" );
}
void <a name="f507"></a>MenuExample::redo()
{
emit explain( "Edit/Redo selected" );
}
void <a name="f508"></a>MenuExample::normal()
{
isBold = FALSE;
isUnderline = FALSE;
<a href="qfont.html">QFont</a> font;
<a name="x1865"></a> label-><a href="qlabel.html#setFont">setFont</a>( font );
<a name="x1872"></a> menu-><a href="qmenudata.html#setItemChecked">setItemChecked</a>( boldID, isBold );
menu-><a href="qmenudata.html#setItemChecked">setItemChecked</a>( underlineID, isUnderline );
emit explain( "Options/Normal selected" );
}
void <a name="f509"></a>MenuExample::bold()
{
isBold = !isBold;
<a href="qfont.html">QFont</a> font;
font.<a href="qfont.html#setBold">setBold</a>( isBold );
font.<a href="qfont.html#setUnderline">setUnderline</a>( isUnderline );
label-><a href="qlabel.html#setFont">setFont</a>( font );
menu-><a href="qmenudata.html#setItemChecked">setItemChecked</a>( boldID, isBold );
emit explain( "Options/Bold selected" );
}
void <a name="f510"></a>MenuExample::underline()
{
isUnderline = !isUnderline;
<a href="qfont.html">QFont</a> font;
font.<a href="qfont.html#setBold">setBold</a>( isBold );
font.<a href="qfont.html#setUnderline">setUnderline</a>( isUnderline );
label-><a href="qlabel.html#setFont">setFont</a>( font );
menu-><a href="qmenudata.html#setItemChecked">setItemChecked</a>( underlineID, isUnderline );
emit explain( "Options/Underline selected" );
}
void <a name="f511"></a>MenuExample::about()
{
<a name="x1874"></a> QMessageBox::<a href="qmessagebox.html#about">about</a>( 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 <a name="f512"></a>MenuExample::aboutQt()
{
<a name="x1875"></a> QMessageBox::<a href="qmessagebox.html#aboutQt">aboutQt</a>( this, "Qt Menu Example" );
}
void <a name="f513"></a>MenuExample::printer()
{
emit explain( "File/Printer/Print selected" );
}
void <a name="f514"></a>MenuExample::file()
{
emit explain( "File/Printer/Print To File selected" );
}
void <a name="f515"></a>MenuExample::fax()
{
emit explain( "File/Printer/Print To Fax selected" );
}
void <a name="f516"></a>MenuExample::printerSetup()
{
emit explain( "File/Printer/Printer Setup selected" );
}
<a name="x1884"></a>void MenuExample::<a href="qwidget.html#resizeEvent">resizeEvent</a>( <a href="qresizeevent.html">QResizeEvent</a> * )
{
label-><a href="qwidget.html#setGeometry">setGeometry</a>( 20, rect().center().y()-20, width()-40, 40 );
}
int main( int argc, char ** argv )
{
<a href="qapplication.html">QApplication</a> a( argc, argv );
MenuExample m;
m.<a href="qwidget.html#setCaption">setCaption</a>("Qt Examples - Menus");
a.<a href="qapplication.html#setMainWidget">setMainWidget</a>( &m );
m.<a href="qwidget.html#show">show</a>();
return a.<a href="qapplication.html#exec">exec</a>();
}
</pre>
<p>See also <a href="examples.html">Examples</a>.
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
<td align=right><div align=right>Qt 3.3.8</div>
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