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<title>A Complete Application Window</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>A Complete Application Window</h1>
<p>
<p> This example program looks like a complete modern application. It
has a menu bar, it has a tool bar, it has a status bar and works
like a simple text editor.
<p> There is a <a href="simple-application.html">walkthrough</a> of
this example.
<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 "filesave.xpm"
#include "fileopen.xpm"
#include "fileprint.xpm"
<a name="f501"></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="qpixmap.html">QPixmap</a> openIcon, saveIcon, printIcon;
<a href="qtoolbar.html">QToolBar</a> * fileTools = new <a href="qtoolbar.html">QToolBar</a>( this, "file operations" );
<a name="x1945"></a> fileTools-><a href="qtoolbar.html#setLabel">setLabel</a>( "File Operations" );
openIcon = QPixmap( fileopen );
QToolButton * fileOpen
= new <a href="qtoolbutton.html">QToolButton</a>( openIcon, "Open File", <a href="qstring.html#QString-null">QString::null</a>,
this, SLOT(choose()), fileTools, "open file" );
saveIcon = QPixmap( filesave );
QToolButton * fileSave
= new <a href="qtoolbutton.html">QToolButton</a>( saveIcon, "Save File", QString::null,
this, SLOT(save()), fileTools, "save file" );
printIcon = QPixmap( fileprint );
QToolButton * filePrint
= new <a href="qtoolbutton.html">QToolButton</a>( printIcon, "Print File", QString::null,
this, SLOT(print()), fileTools, "print file" );
(void)QWhatsThis::whatsThisButton( fileTools );
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="x1946"></a> QWhatsThis::<a href="qwhatsthis.html#add">add</a>( fileOpen, fileOpenText );
<a name="x1926"></a> QMimeSourceFactory::<a href="qmimesourcefactory.html#defaultFactory">defaultFactory</a>()->setPixmap( "fileopen", openIcon );
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>";
QWhatsThis::<a href="qwhatsthis.html#add">add</a>( fileSave, fileSaveText );
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.";
QWhatsThis::<a href="qwhatsthis.html#add">add</a>( filePrint, filePrintText );
<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 );
file-><a href="qmenudata.html#insertItem">insertItem</a>( "&New", this, SLOT(newDoc()), CTRL+Key_N );
int id;
id = file-><a href="qmenudata.html#insertItem">insertItem</a>( openIcon, "&Open...",
this, SLOT(choose()), CTRL+Key_O );
<a name="x1922"></a> file-><a href="qmenudata.html#setWhatsThis">setWhatsThis</a>( id, fileOpenText );
id = file-><a href="qmenudata.html#insertItem">insertItem</a>( saveIcon, "&Save",
this, SLOT(save()), CTRL+Key_S );
file-><a href="qmenudata.html#setWhatsThis">setWhatsThis</a>( id, fileSaveText );
id = file-><a href="qmenudata.html#insertItem">insertItem</a>( "Save &As...", this, SLOT(saveAs()) );
file-><a href="qmenudata.html#setWhatsThis">setWhatsThis</a>( id, fileSaveText );
file-><a href="qmenudata.html#insertSeparator">insertSeparator</a>();
id = file-><a href="qmenudata.html#insertItem">insertItem</a>( printIcon, "&Print...",
this, SLOT(print()), CTRL+Key_P );
file-><a href="qmenudata.html#setWhatsThis">setWhatsThis</a>( id, filePrintText );
file-><a href="qmenudata.html#insertSeparator">insertSeparator</a>();
file-><a href="qmenudata.html#insertItem">insertItem</a>( "&Close", this, SLOT(<a href="qwidget.html#close">close</a>()), CTRL+Key_W );
<a name="x1912"></a> file-><a href="qmenudata.html#insertItem">insertItem</a>( "&Quit", qApp, SLOT( <a href="qapplication.html#closeAllWindows">closeAllWindows</a>() ), CTRL+Key_Q );
<a href="qmainwindow.html#menuBar">menuBar</a>()->insertSeparator();
<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 );
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="f502"></a>ApplicationWindow::newDoc()
{
ApplicationWindow *ed = new ApplicationWindow;
ed-><a href="qwidget.html#setCaption">setCaption</a>("Qt Example - Application");
ed-><a href="qwidget.html#show">show</a>();
}
void <a name="f503"></a>ApplicationWindow::choose()
{
<a name="x1917"></a> <a href="qstring.html">QString</a> fn = QFileDialog::<a href="qfiledialog.html#getOpenFileName">getOpenFileName</a>( QString::null, QString::null,
this);
<a name="x1936"></a> 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="f504"></a>ApplicationWindow::load( const <a href="qstring.html">QString</a> &fileName )
{
<a href="qfile.html">QFile</a> f( fileName );
<a name="x1916"></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="x1944"></a> e-><a href="qtextedit.html#setText">setText</a>( ts.<a href="qtextstream.html#read">read</a>() );
<a name="x1941"></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="f505"></a>ApplicationWindow::save()
{
if ( filename.isEmpty() ) {
saveAs();
return;
}
<a name="x1943"></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;
<a name="x1915"></a> 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="f506"></a>ApplicationWindow::saveAs()
{
<a name="x1918"></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="f507"></a>ApplicationWindow::print()
{
// ###### Rewrite to use QSimpleRichText to print here as well
const int Margin = 10;
int pageNo = 1;
<a name="x1935"></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;
<a name="x1929"></a> if( !p.<a href="qpainter.html#begin">begin</a>( printer ) ) // paint on printer
return;
<a name="x1938"></a><a name="x1933"></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="x1932"></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="x1940"></a> for( int i = 0 ; i < e-><a href="qtextedit.html#lines">lines</a>() ; i++ ) {
<a name="x1927"></a> if ( Margin + yPos > metrics.<a href="qpaintdevicemetrics.html#height">height</a>() - Margin ) {
<a href="qstring.html">QString</a> msg( "Printing (page " );
<a name="x1937"></a> msg += QString::<a href="qstring.html#number">number</a>( ++pageNo );
msg += ")...";
<a href="qmainwindow.html#statusBar">statusBar</a>()->message( msg );
<a name="x1934"></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="x1928"></a><a name="x1919"></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>();
}
<a name="x1931"></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="x1947"></a>void ApplicationWindow::<a href="qwidget.html#closeEvent">closeEvent</a>( <a href="qcloseevent.html">QCloseEvent</a>* ce )
{
<a name="x1939"></a> if ( !e-><a href="qtextedit.html#isModified">isModified</a>() ) {
<a name="x1913"></a> ce-><a href="qcloseevent.html#accept">accept</a>();
return;
}
<a name="x1925"></a> switch( QMessageBox::<a href="qmessagebox.html#information">information</a>( this, "Qt Application Example",
"Do you want to save the changes"
" to the document?",
"Yes", "No", "Cancel",
0, 1 ) ) {
case 0:
save();
ce-><a href="qcloseevent.html#accept">accept</a>();
break;
case 1:
ce-><a href="qcloseevent.html#accept">accept</a>();
break;
case 2:
default: // just for sanity
<a name="x1914"></a> ce-><a href="qcloseevent.html#ignore">ignore</a>();
break;
}
}
void <a name="f508"></a>ApplicationWindow::about()
{
<a name="x1923"></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="f509"></a>ApplicationWindow::aboutQt()
{
<a name="x1924"></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>( "Qt Example - Application" );
mw-><a href="qwidget.html#show">show</a>();
<a name="x1954"></a><a name="x1952"></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="examples.html">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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