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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>A Complete Application Window with Actions</h1>
<p>
<p> This example program is just like the application example,
but uses <a href="qaction.html">QAction</a> to build the menu and the toolbar.
<p> The QAction related part of the program is covered in
detail by the <a href="simple-application-action.html">
QAction application walkthrough</a> whilst the
<a href="simple-application.html">Simple application walkthrough</a>
deals with the rest.
<p> <hr>
<p> Header file:
<p> <pre>/****************************************************************************
** $Id: qt/application.h 3.0.2 edited Oct 12 12:18 $
**
** 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 APPLICATION_H
#define APPLICATION_H
#include <<a href="qmainwindow-h.html">qmainwindow.h</a>>
class QTextEdit;
class ApplicationWindow: public <a href="qmainwindow.html">QMainWindow</a>
{
<a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
public:
ApplicationWindow();
~ApplicationWindow();
protected:
void closeEvent( <a href="qcloseevent.html">QCloseEvent</a>* );
private slots:
void newDoc();
void choose();
void load( const <a href="qstring.html">QString</a> &fileName );
void save();
void saveAs();
void print();
void about();
void aboutQt();
private:
<a href="qprinter.html">QPrinter</a> *printer;
<a href="qtextedit.html">QTextEdit</a> *e;
<a href="qstring.html">QString</a> filename;
};
#endif
</pre>
<p> <hr>
<p> Implementation:
<p> <pre>/****************************************************************************
** $Id: qt/application.cpp 3.0.2 edited Oct 12 12:18 $
**
** 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 "application.h"
#include <<a href="qimage-h.html">qimage.h</a>>
#include <<a href="qpixmap-h.html">qpixmap.h</a>>
#include <<a href="qtoolbar-h.html">qtoolbar.h</a>>
#include <<a href="qtoolbutton-h.html">qtoolbutton.h</a>>
#include <<a href="qpopupmenu-h.html">qpopupmenu.h</a>>
#include <<a href="qmenubar-h.html">qmenubar.h</a>>
#include <<a href="qtextedit-h.html">qtextedit.h</a>>
#include <<a href="qfile-h.html">qfile.h</a>>
#include <<a href="qfiledialog-h.html">qfiledialog.h</a>>
#include <<a href="qstatusbar-h.html">qstatusbar.h</a>>
#include <<a href="qmessagebox-h.html">qmessagebox.h</a>>
#include <<a href="qprinter-h.html">qprinter.h</a>>
#include <<a href="qapplication-h.html">qapplication.h</a>>
#include <<a href="qaccel-h.html">qaccel.h</a>>
#include <<a href="qtextstream-h.html">qtextstream.h</a>>
#include <<a href="qpainter-h.html">qpainter.h</a>>
#include <<a href="qpaintdevicemetrics-h.html">qpaintdevicemetrics.h</a>>
#include <<a href="qwhatsthis-h.html">qwhatsthis.h</a>>
#include <<a href="qaction-h.html">qaction.h</a>>
#include "filesave.xpm"
#include "fileopen.xpm"
#include "fileprint.xpm"
<a name="f537"></a>ApplicationWindow::ApplicationWindow()
: <a href="qmainwindow.html">QMainWindow</a>( 0, "example application main window", WDestructiveClose )
{
printer = new <a href="qprinter.html">QPrinter</a>;
<a href="qaction.html">QAction</a> * fileNewAction;
<a href="qaction.html">QAction</a> * fileOpenAction;
<a href="qaction.html">QAction</a> * fileSaveAction, * fileSaveAsAction, * filePrintAction;
<a href="qaction.html">QAction</a> * fileCloseAction, * fileQuitAction;
fileNewAction = new <a href="qaction.html">QAction</a>( "New", "&New", CTRL+Key_N, this, "new" );
<a name="x2011"></a> <a href="qobject.html#connect">connect</a>( fileNewAction, SIGNAL( <a href="qaction.html#activated">activated</a>() ) , this,
SLOT( newDoc() ) );
fileOpenAction = new <a href="qaction.html">QAction</a>( "Open File", QPixmap( fileopen ), "&Open",
CTRL+Key_O, this, "open" );
<a href="qobject.html#connect">connect</a>( fileOpenAction, SIGNAL( <a href="qaction.html#activated">activated</a>() ) , this, SLOT( choose() ) );
const char * fileOpenText = "<p><img source=\"fileopen\"> "
"Click this button to open a <em>new file</em>. <br>"
"You can also select the <b>Open</b> command "
"from the <b>File</b> menu.</p>";
<a name="x2028"></a> QMimeSourceFactory::<a href="qmimesourcefactory.html#defaultFactory">defaultFactory</a>()->setPixmap( "fileopen",
<a name="x2013"></a> fileOpenAction-><a href="qaction.html#iconSet">iconSet</a>().pixmap() );
<a name="x2014"></a> fileOpenAction-><a href="qaction.html#setWhatsThis">setWhatsThis</a>( fileOpenText );
fileSaveAction = new <a href="qaction.html">QAction</a>( "Save File", QPixmap( filesave ),
"&Save", CTRL+Key_S, this, "save" );
<a href="qobject.html#connect">connect</a>( fileSaveAction, SIGNAL( <a href="qaction.html#activated">activated</a>() ) , this, SLOT( save() ) );
const char * fileSaveText = "<p>Click this button to save the file you "
"are editing. You will be prompted for a file name.\n"
"You can also select the <b>Save</b> command "
"from the <b>File</b> menu.</p>";
fileSaveAction-><a href="qaction.html#setWhatsThis">setWhatsThis</a>( fileSaveText );
fileSaveAsAction = new <a href="qaction.html">QAction</a>( "Save File As", "Save &as", 0, this,
"save as" );
<a href="qobject.html#connect">connect</a>( fileSaveAsAction, SIGNAL( <a href="qaction.html#activated">activated</a>() ) , this,
SLOT( saveAs() ) );
fileSaveAsAction-><a href="qaction.html#setWhatsThis">setWhatsThis</a>( fileSaveText );
filePrintAction = new <a href="qaction.html">QAction</a>( "Print File", QPixmap( fileprint ),
"&Print", CTRL+Key_P, this, "print" );
<a href="qobject.html#connect">connect</a>( filePrintAction, SIGNAL( <a href="qaction.html#activated">activated</a>() ) , this,
SLOT( print() ) );
const char * filePrintText = "Click this button to print the file you "
"are editing.\n You can also select the Print "
"command from the File menu.";
filePrintAction-><a href="qaction.html#setWhatsThis">setWhatsThis</a>( filePrintText );
fileCloseAction = new <a href="qaction.html">QAction</a>( "Close", "&Close", CTRL+Key_W, this,
"close" );
<a href="qobject.html#connect">connect</a>( fileCloseAction, SIGNAL( <a href="qaction.html#activated">activated</a>() ) , this,
SLOT( <a href="qwidget.html#close">close</a>() ) );
fileQuitAction = new <a href="qaction.html">QAction</a>( "Quit", "&Quit", CTRL+Key_Q, this,
"quit" );
<a name="x2015"></a> <a href="qobject.html#connect">connect</a>( fileQuitAction, SIGNAL( <a href="qaction.html#activated">activated</a>() ) , qApp,
SLOT( <a href="qapplication.html#closeAllWindows">closeAllWindows</a>() ) );
// populate a tool bar with some actions
<a href="qtoolbar.html">QToolBar</a> * fileTools = new <a href="qtoolbar.html">QToolBar</a>( this, "file operations" );
<a name="x2047"></a> fileTools-><a href="qtoolbar.html#setLabel">setLabel</a>( "File Operations" );
<a name="x2012"></a> fileOpenAction-><a href="qaction.html#addTo">addTo</a>( fileTools );
fileSaveAction-><a href="qaction.html#addTo">addTo</a>( fileTools );
filePrintAction-><a href="qaction.html#addTo">addTo</a>( fileTools );
(void)QWhatsThis::whatsThisButton( fileTools );
// populate a menu with all actions
<a href="qpopupmenu.html">QPopupMenu</a> * file = new <a href="qpopupmenu.html">QPopupMenu</a>( this );
<a href="qmainwindow.html#menuBar">menuBar</a>()->insertItem( "&File", file );
fileNewAction-><a href="qaction.html#addTo">addTo</a>( file );
fileOpenAction-><a href="qaction.html#addTo">addTo</a>( file );
fileSaveAction-><a href="qaction.html#addTo">addTo</a>( file );
fileSaveAsAction-><a href="qaction.html#addTo">addTo</a>( file );
file-><a href="qmenudata.html#insertSeparator">insertSeparator</a>();
filePrintAction-><a href="qaction.html#addTo">addTo</a>( file );
file-><a href="qmenudata.html#insertSeparator">insertSeparator</a>();
fileCloseAction-><a href="qaction.html#addTo">addTo</a>( file );
fileQuitAction-><a href="qaction.html#addTo">addTo</a>( file );
<a href="qmainwindow.html#menuBar">menuBar</a>()->insertSeparator();
// add a help menu
<a href="qpopupmenu.html">QPopupMenu</a> * help = new <a href="qpopupmenu.html">QPopupMenu</a>( this );
<a href="qmainwindow.html#menuBar">menuBar</a>()->insertItem( "&Help", help );
help-><a href="qmenudata.html#insertItem">insertItem</a>( "&About", this, SLOT(about()), Key_F1 );
help-><a href="qmenudata.html#insertItem">insertItem</a>( "About &Qt", this, SLOT(aboutQt()) );
help-><a href="qmenudata.html#insertSeparator">insertSeparator</a>();
help-><a href="qmenudata.html#insertItem">insertItem</a>( "What's &This", this, SLOT(<a href="qmainwindow.html#whatsThis">whatsThis</a>()),
SHIFT+Key_F1 );
// create and define the central widget
e = new <a href="qtextedit.html">QTextEdit</a>( this, "editor" );
e-><a href="qwidget.html#setFocus">setFocus</a>();
<a href="qmainwindow.html#setCentralWidget">setCentralWidget</a>( e );
<a href="qmainwindow.html#statusBar">statusBar</a>()->message( "Ready", 2000 );
<a href="qwidget.html#resize">resize</a>( 450, 600 );
}
ApplicationWindow::~ApplicationWindow()
{
delete printer;
}
void <a name="f538"></a>ApplicationWindow::newDoc()
{
ApplicationWindow *ed = new ApplicationWindow;
ed-><a href="qwidget.html#show">show</a>();
}
void <a name="f539"></a>ApplicationWindow::choose()
{
<a name="x2020"></a> <a href="qstring.html">QString</a> fn = QFileDialog::<a href="qfiledialog.html#getOpenFileName">getOpenFileName</a>( <a href="qstring.html#QString-null">QString::null</a>, QString::null,
this);
if ( !fn.<a href="qstring.html#isEmpty">isEmpty</a>() )
load( fn );
else
<a href="qmainwindow.html#statusBar">statusBar</a>()->message( "Loading aborted", 2000 );
}
void <a name="f540"></a>ApplicationWindow::load( const <a href="qstring.html">QString</a> &fileName )
{
<a href="qfile.html">QFile</a> f( fileName );
<a name="x2019"></a> if ( !f.<a href="qfile.html#open">open</a>( <a href="qfile.html#open">IO_ReadOnly</a> ) )
return;
<a href="qtextstream.html">QTextStream</a> ts( &f );
<a name="x2046"></a> e-><a href="qtextedit.html#setText">setText</a>( ts.<a href="qtextstream.html#read">read</a>() );
<a name="x2043"></a> e-><a href="qtextedit.html#setModified">setModified</a>( FALSE );
<a href="qwidget.html#setCaption">setCaption</a>( fileName );
<a href="qmainwindow.html#statusBar">statusBar</a>()->message( "Loaded document " + fileName, 2000 );
}
void <a name="f541"></a>ApplicationWindow::save()
{
if ( filename.isEmpty() ) {
saveAs();
return;
}
<a name="x2045"></a> <a href="qstring.html">QString</a> text = e-><a href="qtextedit.html#text">text</a>();
<a href="qfile.html">QFile</a> f( filename );
if ( !f.<a href="qfile.html#open">open</a>( <a href="qfile.html#open">IO_WriteOnly</a> ) ) {
<a href="qmainwindow.html#statusBar">statusBar</a>()->message( QString("Could not write to %1").arg(filename),
2000 );
return;
}
<a href="qtextstream.html">QTextStream</a> t( &f );
t << text;
f.<a href="qfile.html#close">close</a>();
e-><a href="qtextedit.html#setModified">setModified</a>( FALSE );
<a href="qwidget.html#setCaption">setCaption</a>( filename );
<a href="qmainwindow.html#statusBar">statusBar</a>()->message( QString( "File %1 saved" ).arg( filename ), 2000 );
}
void <a name="f542"></a>ApplicationWindow::saveAs()
{
<a name="x2021"></a> <a href="qstring.html">QString</a> fn = QFileDialog::<a href="qfiledialog.html#getSaveFileName">getSaveFileName</a>( QString::null, QString::null,
this );
if ( !fn.<a href="qstring.html#isEmpty">isEmpty</a>() ) {
filename = fn;
save();
} else {
<a href="qmainwindow.html#statusBar">statusBar</a>()->message( "Saving aborted", 2000 );
}
}
void <a name="f543"></a>ApplicationWindow::print()
{
const int Margin = 10;
int pageNo = 1;
<a name="x2037"></a> if ( printer-><a href="qprinter.html#setup">setup</a>(this) ) { // printer dialog
<a href="qmainwindow.html#statusBar">statusBar</a>()->message( "Printing..." );
<a href="qpainter.html">QPainter</a> p;
if( !p.<a href="qpainter.html#begin">begin</a>( printer ) ) // paint on printer
return;
<a name="x2040"></a> p.<a href="qpainter.html#setFont">setFont</a>( e-><a href="qtextedit.html#font">font</a>() );
int yPos = 0; // y-position for each line
<a name="x2034"></a> <a href="qfontmetrics.html">QFontMetrics</a> fm = p.<a href="qpainter.html#fontMetrics">fontMetrics</a>();
<a href="qpaintdevicemetrics.html">QPaintDeviceMetrics</a> metrics( printer ); // need width/height
// of printer surface
<a name="x2042"></a> for( int i = 0 ; i < e-><a href="qtextedit.html#lines">lines</a>() ; i++ ) {
<a name="x2029"></a> if ( Margin + yPos > metrics.<a href="qpaintdevicemetrics.html#height">height</a>() - Margin ) {
<a href="qstring.html">QString</a> msg( "Printing (page " );
<a name="x2039"></a> msg += QString::<a href="qstring.html#number">number</a>( ++pageNo );
msg += ")...";
<a href="qmainwindow.html#statusBar">statusBar</a>()->message( msg );
<a name="x2036"></a> printer-><a href="qprinter.html#newPage">newPage</a>(); // no more room on this page
yPos = 0; // back to top of page
}
p.<a href="qpainter.html#drawText">drawText</a>( Margin, Margin + yPos,
<a name="x2030"></a><a name="x2022"></a> metrics.<a href="qpaintdevicemetrics.html#width">width</a>(), fm.<a href="qfontmetrics.html#lineSpacing">lineSpacing</a>(),
ExpandTabs | DontClip,
e-><a href="qtextedit.html#text">text</a>( i ) );
yPos = yPos + fm.<a href="qfontmetrics.html#lineSpacing">lineSpacing</a>();
}
p.<a href="qpainter.html#end">end</a>(); // send job to printer
<a href="qmainwindow.html#statusBar">statusBar</a>()->message( "Printing completed", 2000 );
} else {
<a href="qmainwindow.html#statusBar">statusBar</a>()->message( "Printing aborted", 2000 );
}
}
<a name="x2048"></a>void ApplicationWindow::<a href="qwidget.html#closeEvent">closeEvent</a>( <a href="qcloseevent.html">QCloseEvent</a>* ce )
{
<a name="x2041"></a> if ( !e-><a href="qtextedit.html#isModified">isModified</a>() ) {
<a name="x2016"></a> ce-><a href="qcloseevent.html#accept">accept</a>();
return;
}
<a name="x2027"></a> switch( QMessageBox::<a href="qmessagebox.html#information">information</a>( this, "Qt Application Example",
"The document has been changed since "
"the last save.",
"Save Now", "Cancel", "Leave Anyway",
0, 1 ) ) {
case 0:
save();
ce-><a href="qcloseevent.html#accept">accept</a>();
break;
case 1:
default: // just for sanity
<a name="x2017"></a> ce-><a href="qcloseevent.html#ignore">ignore</a>();
break;
case 2:
ce-><a href="qcloseevent.html#accept">accept</a>();
break;
}
}
void <a name="f544"></a>ApplicationWindow::about()
{
<a name="x2025"></a> QMessageBox::<a href="qmessagebox.html#about">about</a>( this, "Qt Application Example",
"This example demonstrates simple use of "
"QMainWindow,\nQMenuBar and QToolBar.");
}
void <a name="f545"></a>ApplicationWindow::aboutQt()
{
<a name="x2026"></a> QMessageBox::<a href="qmessagebox.html#aboutQt">aboutQt</a>( this, "Qt Application Example" );
}
</pre>
<p> <hr>
<p> Main:
<p> <pre>/****************************************************************************
** $Id: qt/main.cpp 3.0.2 edited Oct 12 12:18 $
**
** 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 <<a href="qapplication-h.html">qapplication.h</a>>
#include "application.h"
int main( int argc, char ** argv ) {
<a href="qapplication.html">QApplication</a> a( argc, argv );
ApplicationWindow * mw = new ApplicationWindow();
mw-><a href="qwidget.html#setCaption">setCaption</a>( "Document 1" );
mw-><a href="qwidget.html#show">show</a>();
<a name="x2054"></a><a name="x2052"></a> a.<a href="qobject.html#connect">connect</a>( &a, SIGNAL(<a href="qapplication.html#lastWindowClosed">lastWindowClosed</a>()), &a, SLOT(<a href="qapplication.html#quit">quit</a>()) );
return a.<a href="qapplication.html#exec">exec</a>();
}
</pre>
<p>See also <a href="qaction-examples.html">QAction Examples</a>.
<!-- eof -->
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<table width=100% cellspacing=0 border=0><tr>
<td>Copyright © 2001
<a href="http://www.trolltech.com">Trolltech</a><td><a href="http://www.trolltech.com/trademarks.html">Trademarks</a>
<td align=right><div align=right>Qt version 3.0.2</div>
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