application-main-cpp.html

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    help-&gt;<a href="qmenudata.html#deddb9">insertItem</a>( "What's &amp;This", this, SLOT(<a href="qmainwindow.html#f50ce2">whatsThis</a>()), SHIFT+Key_F1 );

    e = new <a href="qmultilineedit.html">QMultiLineEdit</a>( this, "editor" );
    e-&gt;setFocus();
    <a href="qmainwindow.html#fce9ba">setCentralWidget</a>( e );
    <a href="qmainwindow.html#530937">statusBar</a>()-&gt;message( "Ready", 2000 );
    <a href="qwidget.html#ff9d07">resize</a>( 450, 600 );
}

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

void <a name="431"></a>ApplicationWindow::newDoc()
{
    ApplicationWindow *ed = new ApplicationWindow;
    ed-&gt;<a href="qwidget.html#d6a291">setCaption</a>("Qt Example - Application");
    ed-&gt;<a href="qmainwindow.html#eb53e3">show</a>();
}

void <a name="433"></a>ApplicationWindow::load()
{
    <a href="qstring.html">QString</a> fn = QFileDialog::getOpenFileName( QString::null, QString::null,
                                               this);
    if ( !fn.<a href="qstring.html#c62623">isEmpty</a>() )
        <a href=#433>load</a>( fn );
    else
        <a href="qmainwindow.html#530937">statusBar</a>()-&gt;message( "Loading aborted", 2000 );
}

void <a name="433"></a>ApplicationWindow::load( const char *fileName )
{
    <a href="qfile.html">QFile</a> f( fileName );
    if ( !f.<a href="qfile.html#255995">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#bb145b">eof</a>() ) {
        <a href="qstring.html">QString</a> s = t.<a href="qtextstream.html#ae4af4">readLine</a>();
        e-&gt;append( s );
    }
    f.<a href="qfile.html#64e640">close</a>();

    e-&gt;setAutoUpdate( TRUE );
    e-&gt;repaint();
    e-&gt;setEdited( FALSE );
    <a href="qwidget.html#d6a291">setCaption</a>( fileName );
    <a href="qstring.html">QString</a> s;
    s.<a href="qstring.html#926f67">sprintf</a>( "Loaded document %s", fileName );
    <a href="qmainwindow.html#530937">statusBar</a>()-&gt;message( s, 2000 );
}

void <a name="434"></a>ApplicationWindow::save()
{
    if ( filename.isEmpty() ) {
        <a href=#435>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#255995">open</a>( IO_WriteOnly ) ) {
        <a href="qmainwindow.html#530937">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#64e640">close</a>();

    e-&gt;setEdited( FALSE );

    <a href="qwidget.html#d6a291">setCaption</a>( filename );

    <a href="qmainwindow.html#530937">statusBar</a>()-&gt;message( <a href="qstring.html">QString</a>( "File %1 saved" ).arg( filename ), 2000 );
}

void <a name="435"></a>ApplicationWindow::saveAs()
{
    <a href="qstring.html">QString</a> fn = QFileDialog::getSaveFileName( QString::null, QString::null,
                                               this );
    if ( !fn.<a href="qstring.html#c62623">isEmpty</a>() ) {
        filename = fn;
        <a href=#434>save</a>();
    } else {
        <a href="qmainwindow.html#530937">statusBar</a>()-&gt;message( "Saving aborted", 2000 );
    }
}

void <a name="436"></a>ApplicationWindow::print()
{
    const int Margin = 10;
    int pageNo = 1;

    if ( printer-&gt;setup(this) ) {               // printer dialog
        <a href="qmainwindow.html#530937">statusBar</a>()-&gt;message( "Printing..." );
        <a href="qpainter.html">QPainter</a> p;
        if( !p.<a href="qpainter.html#02ed5d">begin</a>( printer ) )
            return;                             // paint on printer

        p.<a href="qpainter.html#998df2">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#73b2e5">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#d4fedb">height</a>() - Margin ) {
                <a href="qstring.html">QString</a> msg( "Printing (page " );
                msg += QString::number( ++pageNo );
                msg += ")...";
                <a href="qmainwindow.html#530937">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#0f088f">drawText</a>( Margin, Margin + yPos,
                        metrics.<a href="qpaintdevicemetrics.html#95eb7b">width</a>(), fm.<a href="qfontmetrics.html#e6e380">lineSpacing</a>(),
                        ExpandTabs | DontClip,
                        e-&gt;textLine( i ) );
            yPos = yPos + fm.<a href="qfontmetrics.html#e6e380">lineSpacing</a>();
        }
        p.<a href="qpainter.html#365784">end</a>();                                // send job to printer
        <a href="qmainwindow.html#530937">statusBar</a>()-&gt;message( "Printing completed", 2000 );
    } else {
        <a href="qmainwindow.html#530937">statusBar</a>()-&gt;message( "Printing aborted", 2000 );
    }
}

void <a name="437"></a>ApplicationWindow::closeEvent( <a href="qcloseevent.html">QCloseEvent</a>* ce )
{
    if ( !e-&gt;edited() ) {
        ce-&gt;<a href="qcloseevent.html#7cf66f">accept</a>();
        return;
    }

    switch( <a href="qmessagebox.html#66b7c8">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=#434>save</a>();
        ce-&gt;<a href="qcloseevent.html#7cf66f">accept</a>();
        break;
    case 1:
    default: // just for sanity
        ce-&gt;<a href="qcloseevent.html#ee1736">ignore</a>();
        break;
    case 2:
        ce-&gt;<a href="qcloseevent.html#7cf66f">accept</a>();
        break;
    }
}

void <a name="438"></a>ApplicationWindow::about()
{
    <a href="qmessagebox.html#f6c3cd">QMessageBox::about</a>( this, "Qt Application Example",
                        "This example demonstrates simple use of "
                        "QMainWindow,\nQMenuBar and QToolBar.");
}

void <a name="439"></a>ApplicationWindow::aboutQt()
{
    <a href="qmessagebox.html#b72270">QMessageBox::aboutQt</a>( this, "Qt Application Example" );
}
</pre>


  <hr>

  Main:
<pre>/****************************************************************************
** &#36;Id&#58; qt/examples/application/main.cpp   2.3.8   edited 2004-05-12 $
**
** 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#d6a291">setCaption</a>( "Qt Example - Application" );
    mw-&gt;<a name="show"></a><a href="qmainwindow.html#eb53e3">show</a>();
    a.<a name="connect"></a><a href="qobject.html#fbde73">connect</a>( &amp;a, SIGNAL(lastWindowClosed()), &amp;a, SLOT(quit()) );
    return a.<a name="exec"></a><a href="qapplication.html#84c7bf">exec</a>();
}
</pre>
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