qaction-application-example.html

来自「QT 下载资料仅供参考」· HTML 代码 · 共 436 行 · 第 1/2 页

    <a href="qmainwindow.html#menuBar">menuBar</a>()-&gt;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>()-&gt;insertItem( "&amp;Help", help );
    help-&gt;<a href="qmenudata.html#insertItem">insertItem</a>( "&amp;About", this, SLOT(about()), Key_F1 );
    help-&gt;<a href="qmenudata.html#insertItem">insertItem</a>( "About &amp;Qt", this, SLOT(aboutQt()) );
    help-&gt;<a href="qmenudata.html#insertSeparator">insertSeparator</a>();
    help-&gt;<a href="qmenudata.html#insertItem">insertItem</a>( "What's &amp;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-&gt;<a href="qwidget.html#setFocus">setFocus</a>();
    <a href="qmainwindow.html#setCentralWidget">setCentralWidget</a>( e );
    <a href="qmainwindow.html#statusBar">statusBar</a>()-&gt;message( "Ready", 2000 );

    <a href="qwidget.html#resize">resize</a>( 450, 600 );
}


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



void <a name="f361"></a>ApplicationWindow::newDoc()
{
    ApplicationWindow *ed = new ApplicationWindow;
    ed-&gt;<a href="qwidget.html#show">show</a>();
}

void <a name="f362"></a>ApplicationWindow::choose()
{
<a name="x1068"></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>()-&gt;message( "Loading aborted", 2000 );
}


void <a name="f363"></a>ApplicationWindow::load( const <a href="qstring.html">QString</a> &amp;fileName )
{
    <a href="qfile.html">QFile</a> f( fileName );
<a name="x1067"></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( &amp;f );
<a name="x1095"></a>    e-&gt;<a href="qtextedit.html#setText">setText</a>( ts.<a href="qtextstream.html#read">read</a>() );
<a name="x1092"></a>    e-&gt;<a href="qtextedit.html#setModified">setModified</a>( FALSE );
    <a href="qwidget.html#setCaption">setCaption</a>( fileName );
    <a href="qmainwindow.html#statusBar">statusBar</a>()-&gt;message( "Loaded document " + fileName, 2000 );
}


void <a name="f364"></a>ApplicationWindow::save()
{
    if ( filename.isEmpty() ) {
        saveAs();
        return;
    }

<a name="x1094"></a>    <a href="qstring.html">QString</a> text = e-&gt;<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>()-&gt;message( QString("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#close">close</a>();

    e-&gt;<a href="qtextedit.html#setModified">setModified</a>( FALSE );

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

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


void <a name="f365"></a>ApplicationWindow::saveAs()
{
<a name="x1069"></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>()-&gt;message( "Saving aborted", 2000 );
    }
}


void <a name="f366"></a>ApplicationWindow::print()
{
    const int Margin = 10;
    int pageNo = 1;

<a name="x1086"></a>    if ( printer-&gt;<a href="qprinter.html#setup">setup</a>(this) ) {               // printer dialog
        <a href="qmainwindow.html#statusBar">statusBar</a>()-&gt;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="x1089"></a>        p.<a href="qpainter.html#setFont">setFont</a>( e-&gt;<a href="qtextedit.html#font">font</a>() );
        int yPos        = 0;                    // y-position for each line
<a name="x1083"></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="x1091"></a>        for( int i = 0 ; i &lt; e-&gt;<a href="qtextedit.html#lines">lines</a>() ; i++ ) {
<a name="x1078"></a>            if ( Margin + yPos &gt; metrics.<a href="qpaintdevicemetrics.html#height">height</a>() - Margin ) {
                <a href="qstring.html">QString</a> msg( "Printing (page " );
<a name="x1088"></a>                msg += QString::<a href="qstring.html#number">number</a>( ++pageNo );
                msg += ")...";
                <a href="qmainwindow.html#statusBar">statusBar</a>()-&gt;message( msg );
<a name="x1085"></a>                printer-&gt;<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="x1079"></a><a name="x1070"></a>                        metrics.<a href="qpaintdevicemetrics.html#width">width</a>(), fm.<a href="qfontmetrics.html#lineSpacing">lineSpacing</a>(),
                        ExpandTabs | DontClip,
                        e-&gt;<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>()-&gt;message( "Printing completed", 2000 );
    } else {
        <a href="qmainwindow.html#statusBar">statusBar</a>()-&gt;message( "Printing aborted", 2000 );
    }
}

<a name="x1097"></a>void ApplicationWindow::<a href="qwidget.html#closeEvent">closeEvent</a>( <a href="qcloseevent.html">QCloseEvent</a>* ce )
{
<a name="x1090"></a>    if ( !e-&gt;<a href="qtextedit.html#isModified">isModified</a>() ) {
<a name="x1064"></a>        ce-&gt;<a href="qcloseevent.html#accept">accept</a>();
        return;
    }

<a name="x1076"></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-&gt;<a href="qcloseevent.html#accept">accept</a>();
        break;
    case 1:
    default: // just for sanity
<a name="x1065"></a>        ce-&gt;<a href="qcloseevent.html#ignore">ignore</a>();
        break;
    case 2:
        ce-&gt;<a href="qcloseevent.html#accept">accept</a>();
        break;
    }
}


void <a name="f367"></a>ApplicationWindow::about()
{
<a name="x1074"></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="f368"></a>ApplicationWindow::aboutQt()
{
<a name="x1075"></a>    QMessageBox::<a href="qmessagebox.html#aboutQt">aboutQt</a>( this, "Qt Application Example" );
}
</pre>

<p> <hr>
<p> Main:
<p> <pre>/****************************************************************************
** $Id:  qt/main.cpp   3.0.5   edited Oct 12 2001 $
**
** 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 href="qapplication-h.html">qapplication.h</a>&gt;
#include "application.h"

int main( int argc, char ** argv ) {
    <a href="qapplication.html">QApplication</a> a( argc, argv );
    ApplicationWindow * mw = new ApplicationWindow();
    mw-&gt;<a href="qwidget.html#setCaption">setCaption</a>( "Document 1" );
<a name="x1102"></a>    mw-&gt;<a href="qwidget.html#show">show</a>();
<a name="x1103"></a><a name="x1100"></a>    a.<a href="qobject.html#connect">connect</a>( &amp;a, SIGNAL(<a href="qapplication.html#lastWindowClosed">lastWindowClosed</a>()), &amp;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>.

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<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 3.0.5</div>
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