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Qt Toolkit - mdi/main.cpp example file
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<table width="100%">
<tr><td><a href="index.html">
<img width="100" height="100" src="qtlogo.png"
alt="Home" border="0"><img width="100"
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<h1 align=center>A MDI Application</h1><br clear="all">

  This example program is just like the application example, but designed as
  Multiple Document Interface (MDI).

  <hr>

  Header file: <pre>/****************************************************************************
** &#36;Id&#58; qt/examples/mdi/application.h   2.3.2   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;
#include &lt;<a href="qlist-h.html">qlist.h</a>&gt;

class QMultiLineEdit;
class QToolBar;
class QPopupMenu;
class QWorkspace;
class QPopupMenu;
class QMovie;

class MDIWindow: public QMainWindow
{
    Q_OBJECT
public:
    MDIWindow( <a href="qwidget.html">QWidget</a>* parent, const char* name, int wflags );
    ~MDIWindow();

    void load( const QString&amp; fn );
    void save();
    void saveAs();
    void print( <a href="qprinter.html">QPrinter</a>* );

signals:
    void message(const QString&amp;, int );

private:
    <a href="qmultilineedit.html">QMultiLineEdit</a>* medit;
    <a href="qmovie.html">QMovie</a> * mmovie;
    <a href="qstring.html">QString</a> filename;
};

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

private slots:
    MDIWindow* newDoc();
    void load();
    void save();
    void saveAs();
    void print();
    void closeWindow();

    void about();
    void aboutQt();

    void windowsMenuAboutToShow();
    void windowsMenuActivated( int id );

private:
    <a href="qprinter.html">QPrinter</a> *printer;
    <a href="qworkspace.html">QWorkspace</a>* ws;
    <a href="qtoolbar.html">QToolBar</a> *fileTools;
    <a href="qpopupmenu.html">QPopupMenu</a>* windowsMenu;
};

#endif
</pre>


  <hr>

  Implementation: <pre>/****************************************************************************
** &#36;Id&#58; qt/examples/mdi/application.cpp   2.3.2   edited 2001-10-18 $
**
** 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 &lt;<a href="qworkspace-h.html">qworkspace.h</a>&gt;
#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="qmovie-h.html">qmovie.h</a>&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="qlabel-h.html">qlabel.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="qpushbutton-h.html">qpushbutton.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 &lt;qobjectlist.h&gt;
#include &lt;<a href="qvbox-h.html">qvbox.h</a>&gt;

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

const char * fileOpenText = "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;

    <a href="qpixmap.html">QPixmap</a> openIcon, saveIcon;

    fileTools = new <a href="qtoolbar.html">QToolBar</a>( this, "file operations" );
    <a href="qmainwindow.html#cf504f">addToolBar</a>( fileTools, <a href="qobject.html#2418a9">tr</a>( "File Operations" ), Top, TRUE );

    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=#443>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=#444>save</a>()), fileTools, "save file" );

#ifndef QT_NO_PRINTER
    printer = new <a href="qprinter.html">QPrinter</a>;
    <a href="qpixmap.html">QPixmap</a> printIcon;

    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=#446>print</a>()), fileTools, "print file" );
    <a href="qwhatsthis.html#dfcd18">QWhatsThis::add</a>( filePrint, filePrintText );
#endif

    (void)QWhatsThis::whatsThisButton( fileTools );

    <a href="qwhatsthis.html#dfcd18">QWhatsThis::add</a>( fileOpen, fileOpenText );
    <a href="qwhatsthis.html#dfcd18">QWhatsThis::add</a>( fileSave, fileSaveText );

    <a href="qpopupmenu.html">QPopupMenu</a> * file = new <a href="qpopupmenu.html">QPopupMenu</a>( this );
    <a href="qmainwindow.html#0eb7bc">menuBar</a>()-&gt;insertItem( "&amp;File", file );

    file-&gt;<a href="qmenudata.html#0076cb">insertItem</a>( "&amp;New", this, SLOT(<a href=#442>newDoc</a>()), CTRL+Key_N );

    id = file-&gt;<a href="qmenudata.html#0076cb">insertItem</a>( openIcon, "&amp;Open",
                           this, SLOT(<a href=#443>load</a>()), CTRL+Key_O );
    file-&gt;<a href="qmenudata.html#88eb55">setWhatsThis</a>( id, fileOpenText );

    id = file-&gt;<a href="qmenudata.html#0076cb">insertItem</a>( saveIcon, "&amp;Save",
                           this, SLOT(<a href=#444>save</a>()), CTRL+Key_S );
    file-&gt;<a href="qmenudata.html#88eb55">setWhatsThis</a>( id, fileSaveText );
    id = file-&gt;<a href="qmenudata.html#0076cb">insertItem</a>( "Save &amp;as...", this, SLOT(<a href=#445>saveAs</a>()) );
    file-&gt;<a href="qmenudata.html#88eb55">setWhatsThis</a>( id, fileSaveText );
#ifndef QT_NO_PRINTER
    file-&gt;<a href="qmenudata.html#e34b79">insertSeparator</a>();
    id = file-&gt;<a href="qmenudata.html#0076cb">insertItem</a>( printIcon, "&amp;Print",
                           this, SLOT(<a href=#446>print</a>()), CTRL+Key_P );
    file-&gt;<a href="qmenudata.html#88eb55">setWhatsThis</a>( id, filePrintText );
#endif
    file-&gt;<a href="qmenudata.html#e34b79">insertSeparator</a>();
    file-&gt;<a href="qmenudata.html#0076cb">insertItem</a>( "&amp;Close", this, SLOT(<a href=#447>closeWindow</a>()), CTRL+Key_W );
    file-&gt;<a href="qmenudata.html#0076cb">insertItem</a>( "&amp;Quit", qApp, SLOT( closeAllWindows() ), CTRL+Key_Q );

    windowsMenu = new <a href="qpopupmenu.html">QPopupMenu</a>( this );
    windowsMenu-&gt;setCheckable( TRUE );
    <a href="qobject.html#7f8e37">connect</a>( windowsMenu, SIGNAL( aboutToShow() ),
             this, SLOT( <a href=#450>windowsMenuAboutToShow</a>() ) );
    <a href="qmainwindow.html#0eb7bc">menuBar</a>()-&gt;insertItem( "&amp;Windows", windowsMenu );

    <a href="qmainwindow.html#0eb7bc">menuBar</a>()-&gt;insertSeparator();
    <a href="qpopupmenu.html">QPopupMenu</a> * help = new <a href="qpopupmenu.html">QPopupMenu</a>( this );
    <a href="qmainwindow.html#0eb7bc">menuBar</a>()-&gt;insertItem( "&amp;Help", help );

    help-&gt;<a href="qmenudata.html#0076cb">insertItem</a>( "&amp;About", this, SLOT(<a href=#448>about</a>()), Key_F1);
    help-&gt;<a href="qmenudata.html#0076cb">insertItem</a>( "About &amp;<a href="qt.html">Qt</a>", this, SLOT(<a href=#449>aboutQt</a>()));
    help-&gt;<a href="qmenudata.html#e34b79">insertSeparator</a>();
    help-&gt;<a href="qmenudata.html#0076cb">insertItem</a>( "What's &amp;This", this, SLOT(<a href="qmainwindow.html#f50ce2">whatsThis</a>()), SHIFT+Key_F1);

    <a href="qvbox.html">QVBox</a>* vb = new <a href="qvbox.html">QVBox</a>( this );
    vb-&gt;<a href="qframe.html#558f79">setFrameStyle</a>( QFrame::StyledPanel | QFrame::Sunken );
    ws = new <a href="qworkspace.html">QWorkspace</a>( vb );
    <a href="qmainwindow.html#fce9ba">setCentralWidget</a>( vb );
    <a href="qmainwindow.html#530937">statusBar</a>()-&gt;message( "Ready", 2000 );
}

ApplicationWindow::~ApplicationWindow()
{
#ifndef QT_NO_PRINTER
    delete printer;
#endif
}

MDIWindow* <a name="442"></a>ApplicationWindow::newDoc()
{
    MDIWindow* w = new MDIWindow( ws, 0, WDestructiveClose );
    <a href="qobject.html#7f8e37">connect</a>( w, SIGNAL( message(const QString&amp;, int) ), <a href="qmainwindow.html#530937">statusBar</a>(), SLOT( message(const QString&amp;, int )) );
    w-&gt;<a href="qwidget.html#d6a291">setCaption</a>("unnamed document");
    w-&gt;<a href="qwidget.html#504fc4">setIcon</a>( <a href="qpixmap.html">QPixmap</a>("document.xpm") );
    // show the very first window in maximized mode
    if ( ws-&gt;windowList().isEmpty() )
        w-&gt;<a href="qwidget.html#b6e000">showMaximized</a>();
    else
        w-&gt;<a href="qwidget.html#200ee5">show</a>();
    return w;
}

void <a name="443"></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>() ) {
        MDIWindow* w = newDoc();
        w-&gt;load( fn );
    }  else {
        <a href="qmainwindow.html#530937">statusBar</a>()-&gt;message( "Loading aborted", 2000 );
    }
}

void <a name="444"></a>ApplicationWindow::save()
{
    MDIWindow* m = (MDIWindow*)ws-&gt;activeWindow();
    if ( m )
        m-&gt;save();
}

void <a name="445"></a>ApplicationWindow::saveAs()
{
    MDIWindow* m = (MDIWindow*)ws-&gt;activeWindow();
    if ( m )
        m-&gt;saveAs();
}

void <a name="446"></a>ApplicationWindow::print()
{
#ifndef QT_NO_PRINTER
    MDIWindow* m = (MDIWindow*)ws-&gt;activeWindow();
    if ( m )
        m-&gt;print( printer );
#endif
}

void <a name="447"></a>ApplicationWindow::closeWindow()
{
    MDIWindow* m = (MDIWindow*)ws-&gt;activeWindow();
    if ( m )
        m-&gt;<a href="qwidget.html#3d9c87">close</a>();
}

void <a name="448"></a>ApplicationWindow::about()
{
    <a href="qmessagebox.html#f6c3cd">QMessageBox::about</a>( this, "Qt Application Example",
                        "This example demonstrates simple use of\n "
                        "Qt's Multiple Document Interface (MDI).");
}

void <a name="449"></a>ApplicationWindow::aboutQt()
{
    <a href="qmessagebox.html#b72270">QMessageBox::aboutQt</a>( this, "Qt Application Example" );
}

void <a name="450"></a>ApplicationWindow::windowsMenuAboutToShow()
{
    windowsMenu-&gt;clear();
    int cascadeId = windowsMenu-&gt;insertItem("&amp;Cascade", ws, SLOT(cascade() ) );
    int tileId = windowsMenu-&gt;insertItem("&amp;Tile", ws, SLOT(tile() ) );
    if ( ws-&gt;windowList().isEmpty() ) {
        windowsMenu-&gt;setItemEnabled( cascadeId, FALSE );
        windowsMenu-&gt;setItemEnabled( tileId, FALSE );
    }
    windowsMenu-&gt;insertSeparator();
    QWidgetList windows = ws-&gt;windowList();
    for ( int i = 0; i &lt; int(windows.count()); ++i ) {
        int id = windowsMenu-&gt;insertItem(windows.at(i)-&gt;caption(),
                                         this, SLOT( <a href=#451>windowsMenuActivated</a>( int ) ) );
        windowsMenu-&gt;setItemParameter( id, i );
        windowsMenu-&gt;setItemChecked( id, ws-&gt;activeWindow() == windows.at(i) );
    }
}

void <a name="451"></a>ApplicationWindow::windowsMenuActivated( int id )
{
    <a href="qwidget.html">QWidget</a>* w = ws-&gt;windowList().at( id );
    if ( w ) {
        w-&gt;<a href="qwidget.html#8a8f06">showNormal</a>();
        w-&gt;<a href="qwidget.html#25775a">setFocus</a>();
    }
}

MDIWindow::MDIWindow( <a href="qwidget.html">QWidget</a>* parent, const char* name, int wflags )
    : <a href="qmainwindow.html">QMainWindow</a>( parent, name, wflags )
{
    mmovie = 0;
    medit = new <a href="qmultilineedit.html">QMultiLineEdit</a>( this );
    <a href="qwidget.html#cddadb">setFocusProxy</a>( medit );
    <a href="qmainwindow.html#fce9ba">setCentralWidget</a>( medit );
}

MDIWindow::~MDIWindow()
{
    delete mmovie;
}

void <a name="438"></a>MDIWindow::load( const QString&amp; fn )
{
    filename  = fn;
    <a href="qfile.html">QFile</a> f( filename );
    if ( !f.<a href="qfile.html#255995">open</a>( IO_ReadOnly ) )
        return;

    if(fn.<a href="qstring.html#3c8233">contains</a>(".gif")) {
        <a href="qwidget.html">QWidget</a> * tmp=new <a href="qwidget.html">QWidget</a>(this);
        <a href="qwidget.html#cddadb">setFocusProxy</a>(tmp);
        <a href="qmainwindow.html#fce9ba">setCentralWidget</a>(tmp);
        medit-&gt;hide();
        delete medit;
        <a href="qmovie.html">QMovie</a> * qm=new <a href="qmovie.html">QMovie</a>(fn);
#ifdef _WS_QWS_ // temporary speed-test hack
        qm-&gt;setDisplayWidget(tmp);
#endif
        tmp-&gt;<a href="qwidget.html#e84bbe">setBackgroundMode</a>(QWidget::NoBackground);
        tmp-&gt;<a href="qwidget.html#200ee5">show</a>();
        mmovie=qm;
    } else {
        mmovie = 0;
        medit-&gt;setAutoUpdate( FALSE );
        medit-&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>();
            medit-&gt;append( s );
        }
        f.<a href="qfile.html#64e640">close</a>();

        medit-&gt;setAutoUpdate( TRUE );
        medit-&gt;repaint();

    }
    <a href="qwidget.html#d6a291">setCaption</a>( filename );
    emit message( <a href="qstring.html">QString</a>("Loaded document %1").arg(filename), 2000 );
}

void <a name="439"></a>MDIWindow::save()
{
    if ( filename.isEmpty() ) {
        <a href=#440>saveAs</a>();
        return;
    }

    <a href="qstring.html">QString</a> text = medit-&gt;text();
    <a href="qfile.html">QFile</a> f( filename );
    if ( !f.<a href="qfile.html#255995">open</a>( IO_WriteOnly ) ) {
        emit 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>();

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

    emit message( <a href="qstring.html">QString</a>( "File %1 saved" ).arg( filename ), 2000 );
}

void <a name="440"></a>MDIWindow::saveAs()
{
    <a href="qstring.html">QString</a> fn = QFileDialog::getSaveFileName( filename, QString::null, this );
    if ( !fn.<a href="qstring.html#c62623">isEmpty</a>() ) {
        filename = fn;
        <a href=#439>save</a>();
    } else {
        emit message( "Saving aborted", 2000 );
    }
}

void <a name="441"></a>MDIWindow::print( <a href="qprinter.html">QPrinter</a>* printer)
{
#ifndef QT_NO_PRINTER
    const int Margin = 10;
    int pageNo = 1;

    if ( printer-&gt;<a href="qprinter.html#c3cd23">setup</a>(this) ) {               // printer dialog
        emit message( "Printing...", 0 );
        <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>( medit-&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; medit-&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 += ")...";
                emit message( msg, 0 );
                printer-&gt;<a href="qprinter.html#d4f693">newPage</a>();             // 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,
                        medit-&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
        emit message( "Printing completed", 2000 );
    } else {
        emit message( "Printing aborted", 2000 );
    }
#endif
}
</pre>


  <hr>

  Main:
<pre>/****************************************************************************
** &#36;Id&#58; qt/examples/mdi/main.cpp   2.3.2   edited 2001-06-12 $
**
** 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 - Multiple Documents Interface (MDI)" );
    mw-&gt;<a name="show"></a><a href="qmainwindow.html#eb53e3">show</a>();
    a.<a name="connect"></a><a href="qobject.html#7f8e37">connect</a>( &amp;a, SIGNAL(lastWindowClosed()), &amp;a, SLOT(quit()) );
    int res = a.<a name="exec"></a><a href="qapplication.html#84c7bf">exec</a>();
    return res;
}
</pre>
<p><address><hr><div align="center">
<table width="100%" cellspacing="0" border="0"><tr>
<td>Copyright  2001 Trolltech<td><a href="http://www.trolltech.com/trademarks.html">Trademarks</a>
<td align="right"><div align="right">Qt version 2.3.2</div>
</table></div></address></body></html>