<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <!-- /tmp/qt-3.0-reggie-28534/qt-x11-free-3.0.2/examples/mdi/mdi.doc:4 --> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>A MDI Application</title> <style type="text/css"><!-- h3.fn,span.fn { margin-left: 1cm; text-indent: -1cm; } a:link { color: #004faf; text-decoration: none } a:visited { color: #672967; text-decoration: none } body { background: #ffffff; color: black; } --></style> </head> <body> <table border="0" cellpadding="0" cellspacing="0" width="100%"> <tr bgcolor="#E5E5E5"> <td valign=center> <a href="index.html"> <font color="#004faf">Home</font></a> | <a href="classes.html"> <font color="#004faf">All Classes</font></a> | <a href="mainclasses.html"> <font color="#004faf">Main Classes</font></a> | <a href="annotated.html"> <font color="#004faf">Annotated</font></a> | <a href="groups.html"> <font color="#004faf">Grouped Classes</font></a> | <a href="functions.html"> <font color="#004faf">Functions</font></a> </td> <td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>A MDI Application</h1> <p> This example program is just like the application example, but designed as Multiple Document Interface (MDI). <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>> #include <<a href="qptrlist-h.html">qptrlist.h</a>> class QMultiLineEdit; class QToolBar; class QPopupMenu; class QWorkspace; class QPopupMenu; class QMovie; class MDIWindow: public <a href="qmainwindow.html">QMainWindow</a> { <a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a> public: MDIWindow( <a href="qwidget.html">QWidget</a>* parent, const char* name, int wflags ); ~MDIWindow(); void load( const <a href="qstring.html">QString</a>& fn ); void save(); void saveAs(); void print( <a href="qprinter.html">QPrinter</a>* ); signals: void message(const <a href="qstring.html">QString</a>&, 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 <a href="qmainwindow.html">QMainWindow</a> { 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> <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="qworkspace-h.html">qworkspace.h</a>> #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="qmovie-h.html">qmovie.h</a>> #include <<a href="qmultilineedit-h.html">qmultilineedit.h</a>> #include <<a href="qfile-h.html">qfile.h</a>> #include <<a href="qfiledialog-h.html">qfiledialog.h</a>> #include <<a href="qlabel-h.html">qlabel.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="qpushbutton-h.html">qpushbutton.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 <qobjectlist.h> #include <<a href="qvbox-h.html">qvbox.h</a>> #include "filesave.xpm" #include "fileopen.xpm" #include "fileprint.xpm" const char * fileOpenText = "Click this button to open a <em>new file</em>. <br><br>" "You can also select the <b>Open command</b> 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."; <a name="f354"></a>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#addToolBar">addToolBar</a>( fileTools, tr( "File Operations" ), DockTop, TRUE ); 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(load()), 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" ); #ifndef QT_NO_PRINTER printer = new <a href="qprinter.html">QPrinter</a>; <a href="qpixmap.html">QPixmap</a> printIcon; printIcon = QPixmap( fileprint ); QToolButton * filePrint = new <a href="qtoolbutton.html">QToolButton</a>( printIcon, "Print File", QString::null, this, SLOT(print()), fileTools, "print file" ); <a name="x1179"></a> QWhatsThis::<a href="qwhatsthis.html#add">add</a>( filePrint, filePrintText ); #endif (void)QWhatsThis::whatsThisButton( fileTools ); QWhatsThis::<a href="qwhatsthis.html#add">add</a>( fileOpen, fileOpenText ); QWhatsThis::<a href="qwhatsthis.html#add">add</a>( fileSave, fileSaveText ); <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 ); <a name="x1148"></a> file-><a href="qmenudata.html#insertItem">insertItem</a>( "&New", this, SLOT(newDoc()), CTRL+Key_N ); id = file-><a href="qmenudata.html#insertItem">insertItem</a>( openIcon, "&Open...", this, SLOT(load()), CTRL+Key_O ); <a name="x1153"></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 ); #ifndef QT_NO_PRINTER <a name="x1149"></a> 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 ); #endif file-><a href="qmenudata.html#insertSeparator">insertSeparator</a>(); file-><a href="qmenudata.html#insertItem">insertItem</a>( "&Close", this, SLOT(closeWindow()), CTRL+Key_W ); <a name="x1140"></a> file-><a href="qmenudata.html#insertItem">insertItem</a>( "&Quit", qApp, SLOT( <a href="qapplication.html#closeAllWindows">closeAllWindows</a>() ), CTRL+Key_Q ); windowsMenu = new <a href="qpopupmenu.html">QPopupMenu</a>( this ); <a name="x1167"></a> windowsMenu-><a href="qpopupmenu.html#setCheckable">setCheckable</a>( TRUE ); <a name="x1166"></a> <a href="qobject.html#connect">connect</a>( windowsMenu, SIGNAL( <a href="qpopupmenu.html#aboutToShow">aboutToShow</a>() ), this, SLOT( windowsMenuAboutToShow() ) ); <a href="qmainwindow.html#menuBar">menuBar</a>()->insertItem( "&Windows", windowsMenu ); <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); <a href="qvbox.html">QVBox</a>* vb = new <a href="qvbox.html">QVBox</a>( this ); vb-><a href="qframe.html#setFrameStyle">setFrameStyle</a>( QFrame::StyledPanel | QFrame::Sunken ); ws = new <a href="qworkspace.html">QWorkspace</a>( vb ); <a name="x1191"></a> ws-><a href="qworkspace.html#setScrollBarsEnabled">setScrollBarsEnabled</a>( TRUE ); <a href="qmainwindow.html#setCentralWidget">setCentralWidget</a>( vb ); <a href="qmainwindow.html#statusBar">statusBar</a>()->message( "Ready", 2000 ); } ApplicationWindow::~ApplicationWindow() { #ifndef QT_NO_PRINTER delete printer; #endif } MDIWindow* <a name="f355"></a>ApplicationWindow::newDoc() { MDIWindow* w = new MDIWindow( ws, 0, WDestructiveClose ); <a href="qobject.html#connect">connect</a>( w, SIGNAL( message(const <a href="qstring.html">QString</a>&, int) ), statusBar(), SLOT( message(const <a href="qstring.html">QString</a>&, int )) ); w-><a href="qwidget.html#setCaption">setCaption</a>("unnamed document"); <a name="x1185"></a> w-><a href="qwidget.html#setIcon">setIcon</a>( QPixmap("document.xpm") ); // show the very first window in maximized mode <a name="x1193"></a> if ( ws-><a href="qworkspace.html#windowList">windowList</a>().isEmpty() ) <a name="x1187"></a> w-><a href="qwidget.html#showMaximized">showMaximized</a>(); else w-><a href="qwidget.html#show">show</a>(); return w; } void <a name="f356"></a>ApplicationWindow::load() { <a name="x1143"></a> <a href="qstring.html">QString</a> fn = QFileDialog::<a href="qfiledialog.html#getOpenFileName">getOpenFileName</a>( QString::null, QString::null, this ); if ( !fn.<a href="qstring.html#isEmpty">isEmpty</a>() ) { MDIWindow* w = newDoc(); w->load( fn ); } else { <a href="qmainwindow.html#statusBar">statusBar</a>()->message( "Loading aborted", 2000 ); } } void <a name="f357"></a>ApplicationWindow::save() { <a name="x1189"></a> MDIWindow* m = (MDIWindow*)ws-><a href="qworkspace.html#activeWindow">activeWindow</a>(); if ( m ) m->save(); } void <a name="f358"></a>ApplicationWindow::saveAs() { MDIWindow* m = (MDIWindow*)ws-><a href="qworkspace.html#activeWindow">activeWindow</a>(); if ( m ) m->saveAs(); } void <a name="f359"></a>ApplicationWindow::print() { #ifndef QT_NO_PRINTER MDIWindow* m = (MDIWindow*)ws-><a href="qworkspace.html#activeWindow">activeWindow</a>(); if ( m ) m->print( printer ); #endif } void <a name="f360"></a>ApplicationWindow::closeWindow() { MDIWindow* m = (MDIWindow*)ws-><a href="qworkspace.html#activeWindow">activeWindow</a>(); if ( m ) <a name="x1180"></a> m-><a href="qwidget.html#close">close</a>(); } void <a name="f361"></a>ApplicationWindow::about() { <a name="x1154"></a> QMessageBox::<a href="qmessagebox.html#about">about</a>( this, "Qt Application Example", "This example demonstrates simple use of\n " "Qt's Multiple Document Interface (MDI)."); } void <a name="f362"></a>ApplicationWindow::aboutQt() { <a name="x1155"></a> QMessageBox::<a href="qmessagebox.html#aboutQt">aboutQt</a>( this, "Qt Application Example" ); } void <a name="f363"></a>ApplicationWindow::windowsMenuAboutToShow() { <a name="x1147"></a> windowsMenu-><a href="qmenudata.html#clear">clear</a>(); <a name="x1190"></a> int cascadeId = windowsMenu-><a href="qmenudata.html#insertItem">insertItem</a>("&Cascade", ws, SLOT(<a href="qworkspace.html#cascade">cascade</a>() ) ); <a name="x1192"></a> int tileId = windowsMenu-><a href="qmenudata.html#insertItem">insertItem</a>("&Tile", ws, SLOT(<a href="qworkspace.html#tile">tile</a>() ) ); if ( ws-><a href="qworkspace.html#windowList">windowList</a>().isEmpty() ) { <a name="x1151"></a> windowsMenu-><a href="qmenudata.html#setItemEnabled">setItemEnabled</a>( cascadeId, FALSE ); windowsMenu-><a href="qmenudata.html#setItemEnabled">setItemEnabled</a>( tileId, FALSE ); } windowsMenu-><a href="qmenudata.html#insertSeparator">insertSeparator</a>(); QWidgetList windows = ws-><a href="qworkspace.html#windowList">windowList</a>(); <a name="x1171"></a> for ( int i = 0; i < int(windows.count()); ++i ) { <a name="x1170"></a> int id = windowsMenu-><a href="qmenudata.html#insertItem">insertItem</a>(windows.at(i)->caption(), this, SLOT( windowsMenuActivated( int ) ) ); <a name="x1152"></a> windowsMenu-><a href="qmenudata.html#setItemParameter">setItemParameter</a>( id, i ); <a name="x1150"></a> windowsMenu-><a href="qmenudata.html#setItemChecked">setItemChecked</a>( id, ws-><a href="qworkspace.html#activeWindow">activeWindow</a>() == windows.at(i) ); } } void <a name="f364"></a>ApplicationWindow::windowsMenuActivated( int id ) { <a href="qwidget.html">QWidget</a>* w = ws-><a href="qworkspace.html#windowList">windowList</a>().at( id ); if ( w ) <a name="x1188"></a> w-><a href="qwidget.html#showNormal">showNormal</a>(); w-><a href="qwidget.html#setFocus">setFocus</a>(); } <a name="f365"></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#setFocusProxy">setFocusProxy</a>( medit ); <a href="qmainwindow.html#setCentralWidget">setCentralWidget</a>( medit ); } MDIWindow::~MDIWindow() { delete mmovie; } void <a name="f366"></a>MDIWindow::load( const <a href="qstring.html">QString</a>& fn ) { filename = fn; <a href="qfile.html">QFile</a> f( filename ); <a name="x1142"></a> if ( !f.<a href="qfile.html#open">open</a>( <a href="qfile.html#open">IO_ReadOnly</a> ) ) return; <a name="x1172"></a> if(fn.<a href="qstring.html#contains">contains</a>(".gif")) { <a href="qwidget.html">QWidget</a> * tmp=new <a href="qwidget.html">QWidget</a>(this); <a href="qwidget.html#setFocusProxy">setFocusProxy</a>(tmp); <a href="qmainwindow.html#setCentralWidget">setCentralWidget</a>(tmp); <a name="x1181"></a> medit-><a href="qwidget.html#hide">hide</a>(); delete medit; <a href="qmovie.html">QMovie</a> * qm=new <a href="qmovie.html">QMovie</a>(fn); #ifdef Q_WS_QWS // temporary speed-test hack <a name="x1156"></a> qm->setDisplayWidget(tmp); #endif <a name="x1182"></a> tmp-><a href="qwidget.html#setBackgroundMode">setBackgroundMode</a>(QWidget::NoBackground); tmp-><a href="qwidget.html#show">show</a>(); mmovie=qm; } else { mmovie = 0; <a href="qtextstream.html">QTextStream</a> t(&f); <a name="x1178"></a> <a href="qstring.html">QString</a> s = t.<a href="qtextstream.html#read">read</a>(); medit-><a href="qtextedit.html#setText">setText</a>( s ); <a name="x1141"></a> f.<a href="qfile.html#close">close</a>(); } <a href="qwidget.html#setCaption">setCaption</a>( filename ); emit message( QString("Loaded document %1").arg(filename), 2000 ); } void <a name="f367"></a>MDIWindow::save() { if ( filename.isEmpty() ) { saveAs(); return; } <a name="x1177"></a> <a href="qstring.html">QString</a> text = medit-><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> ) ) { emit message( QString("Could not write to %1").arg(filename), 2000 ); return; } <a href="qtextstream.html">QTextStream</a> t( &f ); t << text; f.<a href="qfile.html#close">close</a>(); <a href="qwidget.html#setCaption">setCaption</a>( filename ); emit message( QString( "File %1 saved" ).arg( filename ), 2000 ); } void <a name="f368"></a>MDIWindow::saveAs() { <a name="x1144"></a> <a href="qstring.html">QString</a> fn = QFileDialog::<a href="qfiledialog.html#getSaveFileName">getSaveFileName</a>( filename, QString::null, this ); if ( !fn.<a href="qstring.html#isEmpty">isEmpty</a>() ) { filename = fn; save(); } else { emit message( "Saving aborted", 2000 ); } } void <a name="f369"></a>MDIWindow::print( <a href="qprinter.html">QPrinter</a>* printer) { #ifndef QT_NO_PRINTER const int Margin = 10; int pageNo = 1; <a name="x1169"></a> if ( printer-><a href="qprinter.html#setup">setup</a>(this) ) { // printer dialog emit message( "Printing...", 0 ); <a href="qpainter.html">QPainter</a> p; if ( !p.<a href="qpainter.html#begin">begin</a>( printer ) ) return; // paint on printer <a name="x1175"></a> p.<a href="qpainter.html#setFont">setFont</a>( medit-><a href="qtextedit.html#font">font</a>() ); int yPos = 0; // y position for each line <a name="x1164"></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="x1157"></a> for( int i = 0 ; i < medit-><a href="qmultilineedit.html#numLines">numLines</a>() ; i++ ) { <a name="x1159"></a> if ( Margin + yPos > metrics.<a href="qpaintdevicemetrics.html#height">height</a>() - Margin ) { <a href="qstring.html">QString</a> msg( "Printing (page " ); <a name="x1174"></a> msg += QString::<a href="qstring.html#number">number</a>( ++pageNo ); msg += ")..."; emit message( msg, 0 ); <a name="x1168"></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="x1160"></a><a name="x1145"></a> metrics.<a href="qpaintdevicemetrics.html#width">width</a>(), fm.<a href="qfontmetrics.html#lineSpacing">lineSpacing</a>(), ExpandTabs | DontClip, <a name="x1158"></a> medit-><a href="qmultilineedit.html#textLine">textLine</a>( i ) ); yPos = yPos + fm.<a href="qfontmetrics.html#lineSpacing">lineSpacing</a>(); } p.<a href="qpainter.html#end">end</a>(); // send job to printer emit message( "Printing completed", 2000 ); } else { emit message( "Printing aborted", 2000 ); } #endif } </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 - Multiple Documents Interface (MDI)" ); mw-><a href="qwidget.html#show">show</a>(); <a name="x1197"></a><a name="x1195"></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>()) ); int res = a.<a href="qapplication.html#exec">exec</a>(); return res; } </pre> <p>See also <a href="examples.html">Examples</a>. <!-- eof --> <p><address><hr><div align=center> <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> </table></div></address></body> </html>