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Qt Toolkit - application/main.cpp example file
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<h1 align=center>A Complete Application Window</h1><br clear="all">

  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.

  There is a <a href="simple-application.html">walkthrough</a> of
  this example.

  <hr>

  Header file: <pre>/****************************************************************************
** &#36;Id&#58; qt/examples/application/application.h   2.3.1   edited 2001-01-26 $
**
** 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 &lt;<a href="qmainwindow-h.html">qmainwindow.h</a>&gt;

class QMultiLineEdit;
class QToolBar;
class QPopupMenu;

class ApplicationWindow: public QMainWindow
{
    Q_OBJECT
public:
    ApplicationWindow();
    ~ApplicationWindow();

protected:
    void closeEvent( <a href="qcloseevent.html">QCloseEvent</a>* );

private slots:
    void newDoc();
    void load();
    void load( const char *fileName );
    void save();
    void saveAs();
    void print();

    void about();
    void aboutQt();

private:
    <a href="qprinter.html">QPrinter</a> *printer;
    <a href="qmultilineedit.html">QMultiLineEdit</a> *e;
    <a href="qtoolbar.html">QToolBar</a> *fileTools;
    <a href="qstring.html">QString</a> filename;
};

#endif
</pre>


  <hr>

  Implementation: <pre>/****************************************************************************
** &#36;Id&#58; qt/examples/application/application.cpp   2.3.1   edited 2001-01-26 $
**
** 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 &lt;<a href="qimage-h.html">qimage.h</a>&gt;
#include &lt;<a href="qpixmap-h.html">qpixmap.h</a>&gt;
#include &lt;<a href="qtoolbar-h.html">qtoolbar.h</a>&gt;
#include &lt;<a href="qtoolbutton-h.html">qtoolbutton.h</a>&gt;
#include &lt;<a href="qpopupmenu-h.html">qpopupmenu.h</a>&gt;
#include &lt;<a href="qmenubar-h.html">qmenubar.h</a>&gt;
#include &lt;qkeycode.h&gt;
#include &lt;<a href="qmultilineedit-h.html">qmultilineedit.h</a>&gt;
#include &lt;<a href="qfile-h.html">qfile.h</a>&gt;
#include &lt;<a href="qfiledialog-h.html">qfiledialog.h</a>&gt;
#include &lt;<a href="qstatusbar-h.html">qstatusbar.h</a>&gt;
#include &lt;<a href="qmessagebox-h.html">qmessagebox.h</a>&gt;
#include &lt;<a href="qprinter-h.html">qprinter.h</a>&gt;
#include &lt;<a href="qapplication-h.html">qapplication.h</a>&gt;
#include &lt;<a href="qaccel-h.html">qaccel.h</a>&gt;
#include &lt;<a href="qtextstream-h.html">qtextstream.h</a>&gt;
#include &lt;<a href="qpainter-h.html">qpainter.h</a>&gt;
#include &lt;<a href="qpaintdevicemetrics-h.html">qpaintdevicemetrics.h</a>&gt;
#include &lt;<a href="qwhatsthis-h.html">qwhatsthis.h</a>&gt;

#include "filesave.xpm"
#include "fileopen.xpm"
#include "fileprint.xpm"

const char * fileOpenText = "&lt;img source=\"fileopen\"&gt; "
"Click this button to open a &lt;em&gt;new file&lt;/em&gt;. &lt;br&gt;&lt;br&gt;"
"You can also select the &lt;b&gt;Open command&lt;/b&gt; from the File menu.";
const char * fileSaveText = "Click this button to save the file you are "
"editing.  You will be prompted for a file name.\n\n"
"You can also select the Save command from the File menu.\n\n"
"Note that implementing this function is left as an exercise for the reader.";
const char * filePrintText = "Click this button to print the file you "
"are editing.\n\n"
"You can also select the Print command from the File menu.";

ApplicationWindow::ApplicationWindow()
    : <a href="qmainwindow.html">QMainWindow</a>( 0, "example application main window", WDestructiveClose )
{
    int id;

    printer = new <a href="qprinter.html">QPrinter</a>;
    <a href="qpixmap.html">QPixmap</a> openIcon, saveIcon, printIcon;

    fileTools = new <a href="qtoolbar.html">QToolBar</a>( this, "file operations" );
    fileTools-&gt;setLabel( <a href="qobject.html#ba30fb">tr</a>( "File Operations" ) );

    openIcon = QPixmap( fileopen );
    <a href="qtoolbutton.html">QToolButton</a> * fileOpen
        = new <a href="qtoolbutton.html">QToolButton</a>( openIcon, "Open File", QString::null,
                           this, SLOT(<a href=#158>load</a>()), fileTools, "open file" );

    saveIcon = QPixmap( filesave );
    <a href="qtoolbutton.html">QToolButton</a> * fileSave
        = new <a href="qtoolbutton.html">QToolButton</a>( saveIcon, "Save File", QString::null,
                           this, SLOT(<a href=#159>save</a>()), fileTools, "save file" );

    printIcon = QPixmap( fileprint );
    <a href="qtoolbutton.html">QToolButton</a> * filePrint
        = new <a href="qtoolbutton.html">QToolButton</a>( printIcon, "Print File", QString::null,
                           this, SLOT(<a href=#161>print</a>()), fileTools, "print file" );

    (void)QWhatsThis::whatsThisButton( fileTools );

    <a href="qwhatsthis.html#5265e7">QWhatsThis::add</a>( fileOpen, fileOpenText );
    <a href="qmimesourcefactory.html#28c4d9">QMimeSourceFactory::defaultFactory</a>()-&gt;setPixmap( "fileopen", openIcon );
    <a href="qwhatsthis.html#5265e7">QWhatsThis::add</a>( fileSave, fileSaveText );
    <a href="qwhatsthis.html#5265e7">QWhatsThis::add</a>( filePrint, filePrintText );

    <a href="qpopupmenu.html">QPopupMenu</a> * file = new <a href="qpopupmenu.html">QPopupMenu</a>( this );
    <a href="qmainwindow.html#2fcbc3">menuBar</a>()-&gt;insertItem( "&amp;File", file );

    file-&gt;<a href="qmenudata.html#43c652">insertItem</a>( "&amp;New", this, SLOT(<a href=#156>newDoc</a>()), CTRL+Key_N );

    id = file-&gt;<a href="qmenudata.html#43c652">insertItem</a>( openIcon, "&amp;Open",
                           this, SLOT(<a href=#158>load</a>()), CTRL+Key_O );
    file-&gt;<a href="qmenudata.html#a678e4">setWhatsThis</a>( id, fileOpenText );

    id = file-&gt;<a href="qmenudata.html#43c652">insertItem</a>( saveIcon, "&amp;Save",
                           this, SLOT(<a href=#159>save</a>()), CTRL+Key_S );
    file-&gt;<a href="qmenudata.html#a678e4">setWhatsThis</a>( id, fileSaveText );
    id = file-&gt;<a href="qmenudata.html#43c652">insertItem</a>( "Save &amp;as...", this, SLOT(<a href=#160>saveAs</a>()) );
    file-&gt;<a href="qmenudata.html#a678e4">setWhatsThis</a>( id, fileSaveText );
    file-&gt;<a href="qmenudata.html#5f2cea">insertSeparator</a>();
    id = file-&gt;<a href="qmenudata.html#43c652">insertItem</a>( printIcon, "&amp;Print",
                           this, SLOT(<a href=#161>print</a>()), CTRL+Key_P );
    file-&gt;<a href="qmenudata.html#a678e4">setWhatsThis</a>( id, filePrintText );
    file-&gt;<a href="qmenudata.html#5f2cea">insertSeparator</a>();
    file-&gt;<a href="qmenudata.html#43c652">insertItem</a>( "&amp;Close", this, SLOT(<a href="qwidget.html#930c34">close</a>()), CTRL+Key_W );
    file-&gt;<a href="qmenudata.html#43c652">insertItem</a>( "&amp;Quit", qApp, SLOT( closeAllWindows() ), CTRL+Key_Q );

    <a href="qpopupmenu.html">QPopupMenu</a> * help = new <a href="qpopupmenu.html">QPopupMenu</a>( this );
    <a href="qmainwindow.html#2fcbc3">menuBar</a>()-&gt;insertSeparator();
    <a href="qmainwindow.html#2fcbc3">menuBar</a>()-&gt;insertItem( "&amp;Help", help );

    help-&gt;<a href="qmenudata.html#43c652">insertItem</a>( "&amp;About", this, SLOT(<a href=#163>about</a>()), Key_F1 );
    help-&gt;<a href="qmenudata.html#43c652">insertItem</a>( "About &amp;<a href="qt.html">Qt</a>", this, SLOT(<a href=#164>aboutQt</a>()) );
    help-&gt;<a href="qmenudata.html#5f2cea">insertSeparator</a>();
    help-&gt;<a href="qmenudata.html#43c652">insertItem</a>( "What's &amp;This", this, SLOT(<a href="qmainwindow.html#db02bc">whatsThis</a>()), SHIFT+Key_F1 );

    e = new <a href="qmultilineedit.html">QMultiLineEdit</a>( this, "editor" );
    e-&gt;setFocus();
    <a href="qmainwindow.html#0983b6">setCentralWidget</a>( e );
    <a href="qmainwindow.html#14153d">statusBar</a>()-&gt;message( "Ready", 2000 );
    <a href="qwidget.html#9ff9d8">resize</a>( 450, 600 );
}

ApplicationWindow::~ApplicationWindow()
{
    delete printer;
}

void <a name="156"></a>ApplicationWindow::newDoc()
{
    ApplicationWindow *ed = new ApplicationWindow;
    ed-&gt;<a href="qmainwindow.html#e71bb3">show</a>();
}

void <a name="158"></a>ApplicationWindow::load()
{
    <a href="qstring.html">QString</a> fn = QFileDialog::getOpenFileName( QString::null, QString::null,
                                               this);
    if ( !fn.<a href="qstring.html#9a6d7e">isEmpty</a>() )
        <a href=#158>load</a>( fn );
    else
        <a href="qmainwindow.html#14153d">statusBar</a>()-&gt;message( "Loading aborted", 2000 );
}

void <a name="158"></a>ApplicationWindow::load( const char *fileName )
{
    <a href="qfile.html">QFile</a> f( fileName );
    if ( !f.<a href="qfile.html#44ae9b">open</a>( IO_ReadOnly ) )
        return;

    e-&gt;setAutoUpdate( FALSE );
    e-&gt;clear();

    <a href="qtextstream.html">QTextStream</a> t(&amp;f);
    while ( !t.<a href="qtextstream.html#29d3b3">eof</a>() ) {
        <a href="qstring.html">QString</a> s = t.<a href="qtextstream.html#6a73a4">readLine</a>();
        e-&gt;append( s );
    }
    f.<a href="qfile.html#e37a87">close</a>();

    e-&gt;setAutoUpdate( TRUE );
    e-&gt;repaint();
    e-&gt;setEdited( FALSE );
    <a href="qwidget.html#d4f007">setCaption</a>( fileName );
    <a href="qstring.html">QString</a> s;
    s.<a href="qstring.html#2eb9bc">sprintf</a>( "Loaded document %s", fileName );
    <a href="qmainwindow.html#14153d">statusBar</a>()-&gt;message( s, 2000 );
}

void <a name="159"></a>ApplicationWindow::save()
{
    if ( filename.isEmpty() ) {
        <a href=#160>saveAs</a>();
        return;
    }

    <a href="qstring.html">QString</a> text = e-&gt;text();
    <a href="qfile.html">QFile</a> f( filename );
    if ( !f.<a href="qfile.html#44ae9b">open</a>( IO_WriteOnly ) ) {
        <a href="qmainwindow.html#14153d">statusBar</a>()-&gt;message( <a href="qstring.html">QString</a>("Could not write to %1").arg(filename),
                              2000 );
        return;
    }

    <a href="qtextstream.html">QTextStream</a> t( &amp;f );
    t &lt;&lt; text;
    f.<a href="qfile.html#e37a87">close</a>();

    e-&gt;setEdited( FALSE );

    <a href="qwidget.html#d4f007">setCaption</a>( filename );

    <a href="qmainwindow.html#14153d">statusBar</a>()-&gt;message( <a href="qstring.html">QString</a>( "File %1 saved" ).arg( filename ), 2000 );
}

void <a name="160"></a>ApplicationWindow::saveAs()
{
    <a href="qstring.html">QString</a> fn = QFileDialog::getSaveFileName( QString::null, QString::null,
                                               this );
    if ( !fn.<a href="qstring.html#9a6d7e">isEmpty</a>() ) {
        filename = fn;
        <a href=#159>save</a>();
    } else {
        <a href="qmainwindow.html#14153d">statusBar</a>()-&gt;message( "Saving aborted", 2000 );
    }
}

void <a name="161"></a>ApplicationWindow::print()
{
    const int Margin = 10;
    int pageNo = 1;

    if ( printer-&gt;setup(this) ) {               // printer dialog
        <a href="qmainwindow.html#14153d">statusBar</a>()-&gt;message( "Printing..." );
        <a href="qpainter.html">QPainter</a> p;
        if( !p.<a href="qpainter.html#59f1bb">begin</a>( printer ) )
            return;                             // paint on printer

        p.<a href="qpainter.html#e4d6b7">setFont</a>( e-&gt;font() );
        int yPos        = 0;                    // y position for each line
        <a href="qfontmetrics.html">QFontMetrics</a> fm = p.<a href="qpainter.html#f572a5">fontMetrics</a>();
        <a href="qpaintdevicemetrics.html">QPaintDeviceMetrics</a> metrics( printer ); // need width/height
                                                // of printer surface
        for( int i = 0 ; i &lt; e-&gt;numLines() ; i++ ) {
            if ( Margin + yPos &gt; metrics.<a href="qpaintdevicemetrics.html#3792df">height</a>() - Margin ) {
                <a href="qstring.html">QString</a> msg( "Printing (page " );
                msg += QString::number( ++pageNo );
                msg += ")...";
                <a href="qmainwindow.html#14153d">statusBar</a>()-&gt;message( msg );
                printer-&gt;newPage();             // no more room on this page
                yPos = 0;                       // back to top of page
            }
            p.<a href="qpainter.html#8a59ed">drawText</a>( Margin, Margin + yPos,
                        metrics.<a href="qpaintdevicemetrics.html#a53b11">width</a>(), fm.<a href="qfontmetrics.html#ebe056">lineSpacing</a>(),
                        ExpandTabs | DontClip,
                        e-&gt;textLine( i ) );
            yPos = yPos + fm.<a href="qfontmetrics.html#ebe056">lineSpacing</a>();
        }
        p.<a href="qpainter.html#c7f9ac">end</a>();                                // send job to printer
        <a href="qmainwindow.html#14153d">statusBar</a>()-&gt;message( "Printing completed", 2000 );
    } else {
        <a href="qmainwindow.html#14153d">statusBar</a>()-&gt;message( "Printing aborted", 2000 );
    }
}

void <a name="162"></a>ApplicationWindow::closeEvent( <a href="qcloseevent.html">QCloseEvent</a>* ce )
{
    if ( !e-&gt;edited() ) {
        ce-&gt;<a href="qcloseevent.html#47cc57">accept</a>();
        return;
    }

    switch( <a href="qmessagebox.html#2e454b">QMessageBox::information</a>( this, "Qt Application Example",
                                      "The document has been changed since "
                                      "the last save.",
                                      "Save Now", "Cancel", "Leave Anyway",
                                      0, 1 ) ) {
    case 0:
        <a href=#159>save</a>();
        ce-&gt;<a href="qcloseevent.html#47cc57">accept</a>();
        break;
    case 1:
    default: // just for sanity
        ce-&gt;<a href="qcloseevent.html#e2007a">ignore</a>();
        break;
    case 2:
        ce-&gt;<a href="qcloseevent.html#47cc57">accept</a>();
        break;
    }
}

void <a name="163"></a>ApplicationWindow::about()
{
    <a href="qmessagebox.html#e67950">QMessageBox::about</a>( this, "Qt Application Example",
                        "This example demonstrates simple use of "
                        "QMainWindow,\nQMenuBar and QToolBar.");
}

void <a name="164"></a>ApplicationWindow::aboutQt()
{
    <a href="qmessagebox.html#976755">QMessageBox::aboutQt</a>( this, "Qt Application Example" );
}
</pre>


  <hr>

  Main:
<pre>/****************************************************************************
** &#36;Id&#58; qt/examples/application/main.cpp   2.3.1   edited 2001-01-26 $
**
** 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 &lt;<a name="qapplication.h"></a><a href="qapplication-h.html">qapplication.h</a>&gt;
#include "application.h"

int main( int argc, char ** argv ) {
    <a name="QApplication"></a><a href="qapplication.html">QApplication</a> a( argc, argv );
    ApplicationWindow * mw = new ApplicationWindow();
    mw-&gt;<a name="setCaption"></a><a href="qwidget.html#d4f007">setCaption</a>( "Document 1" );
    mw-&gt;<a name="show"></a><a href="qmainwindow.html#e71bb3">show</a>();
    a.<a name="connect"></a><a href="qobject.html#c2d209">connect</a>( &amp;a, SIGNAL(lastWindowClosed()), &amp;a, SLOT(quit()) );
    return a.<a name="exec"></a><a href="qapplication.html#7076af">exec</a>();
}
</pre>
<p><address><hr><div align="center">
<table width="100%" cellspacing="0" border="0"><tr>
<td>Copyright  2000 Trolltech<td><a href="http://www.trolltech.com/trademarks.html">Trademarks</a>
<td align="right"><div align="right">Qt version 2.3.1</div>
</table></div></address></body></html>