<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/examples/action/application.doc:5 --> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>A Complete Application Window with Actions</title> <style type="text/css"><!-- 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 Complete Application Window with Actions</h1> <p> <p> The <a href="qaction.html">QAction</a> class provides a way of associating user input from different user interface elements with abstract high level actions. This approach makes it easy to customize applications for different types of users. <p> This example program is just like the <a href="simple-application-example.html">application example</a>, but uses QAction to build the menu and the toolbar. <p> <hr> <p> Header file: <p> <pre>/**************************************************************************** ** $Id: qt/application.h 3.3.8 edited Jan 11 14:36 $ ** ** Copyright (C) 1992-2007 Trolltech ASA. 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>> class QTextEdit; class ApplicationWindow: public <a href="qmainwindow.html">QMainWindow</a> { <a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a> public: ApplicationWindow(); ~ApplicationWindow(); protected: void closeEvent( <a href="qcloseevent.html">QCloseEvent</a>* ); private slots: void newDoc(); void choose(); void load( const <a href="qstring.html">QString</a> &fileName ); void save(); void saveAs(); void print(); void about(); void aboutQt(); private: <a href="qprinter.html">QPrinter</a> *printer; <a href="qtextedit.html">QTextEdit</a> *e; <a href="qstring.html">QString</a> filename; }; #endif </pre> <p> <hr> <p> Implementation: <p> <pre>/**************************************************************************** ** $Id: qt/application.cpp 3.3.8 edited Jan 11 14:36 $ ** ** Copyright (C) 1992-2007 Trolltech ASA. 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="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="qtextedit-h.html">qtextedit.h</a>> #include <<a href="qfile-h.html">qfile.h</a>> #include <<a href="qfiledialog-h.html">qfiledialog.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="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 <<a href="qaction-h.html">qaction.h</a>> #include <<a href="qsimplerichtext-h.html">qsimplerichtext.h</a>> #include "filesave.xpm" #include "fileopen.xpm" #include "fileprint.xpm" <a name="f375"></a>ApplicationWindow::ApplicationWindow() : <a href="qmainwindow.html">QMainWindow</a>( 0, "example application main window", WDestructiveClose ) { printer = new <a href="qprinter.html">QPrinter</a>( QPrinter::HighResolution ); <a href="qaction.html">QAction</a> * fileNewAction; <a href="qaction.html">QAction</a> * fileOpenAction; <a href="qaction.html">QAction</a> * fileSaveAction, * fileSaveAsAction, * filePrintAction; <a href="qaction.html">QAction</a> * fileCloseAction, * fileQuitAction; fileNewAction = new <a href="qaction.html">QAction</a>( "&New", CTRL+Key_N, this, "new" ); <a name="x1123"></a> <a href="qobject.html#connect">connect</a>( fileNewAction, SIGNAL( <a href="qaction.html#activated">activated</a>() ) , this, SLOT( newDoc() ) ); fileOpenAction = new <a href="qaction.html">QAction</a>( QPixmap( fileopen ), "&Open...", CTRL+Key_O, this, "open" ); <a href="qobject.html#connect">connect</a>( fileOpenAction, SIGNAL( <a href="qaction.html#activated">activated</a>() ) , this, SLOT( choose() ) ); const char * fileOpenText = "<p><img source=\"fileopen\"> " "Click this button to open a <em>new file</em>. <br>" "You can also select the <b>Open</b> command " "from the <b>File</b> menu.</p>"; <a name="x1140"></a> QMimeSourceFactory::<a href="qmimesourcefactory.html#defaultFactory">defaultFactory</a>()->setPixmap( "fileopen", <a name="x1125"></a> fileOpenAction-><a href="qaction.html#iconSet">iconSet</a>().pixmap() ); <a name="x1126"></a> fileOpenAction-><a href="qaction.html#setWhatsThis">setWhatsThis</a>( fileOpenText ); fileSaveAction = new <a href="qaction.html">QAction</a>( QPixmap( filesave ), "&Save", CTRL+Key_S, this, "save" ); <a href="qobject.html#connect">connect</a>( fileSaveAction, SIGNAL( <a href="qaction.html#activated">activated</a>() ) , this, SLOT( save() ) ); const char * fileSaveText = "<p>Click this button to save the file you " "are editing. You will be prompted for a file name.\n" "You can also select the <b>Save</b> command " "from the <b>File</b> menu.</p>"; fileSaveAction-><a href="qaction.html#setWhatsThis">setWhatsThis</a>( fileSaveText ); fileSaveAsAction = new <a href="qaction.html">QAction</a>( "Save File As", "Save &As...", 0, this, "save as" ); <a href="qobject.html#connect">connect</a>( fileSaveAsAction, SIGNAL( <a href="qaction.html#activated">activated</a>() ) , this, SLOT( saveAs() ) ); fileSaveAsAction-><a href="qaction.html#setWhatsThis">setWhatsThis</a>( fileSaveText ); filePrintAction = new <a href="qaction.html">QAction</a>( "Print File", QPixmap( fileprint ), "&Print...", CTRL+Key_P, this, "print" ); <a href="qobject.html#connect">connect</a>( filePrintAction, SIGNAL( <a href="qaction.html#activated">activated</a>() ) , this, SLOT( print() ) ); const char * filePrintText = "Click this button to print the file you " "are editing.\n You can also select the Print " "command from the File menu."; filePrintAction-><a href="qaction.html#setWhatsThis">setWhatsThis</a>( filePrintText ); fileCloseAction = new <a href="qaction.html">QAction</a>( "Close", "&Close", CTRL+Key_W, this, "close" ); <a href="qobject.html#connect">connect</a>( fileCloseAction, SIGNAL( <a href="qaction.html#activated">activated</a>() ) , this, SLOT( <a href="qwidget.html#close">close</a>() ) ); fileQuitAction = new <a href="qaction.html">QAction</a>( "Quit", "&Quit", CTRL+Key_Q, this, "quit" ); <a name="x1127"></a> <a href="qobject.html#connect">connect</a>( fileQuitAction, SIGNAL( <a href="qaction.html#activated">activated</a>() ) , qApp, SLOT( <a href="qapplication.html#closeAllWindows">closeAllWindows</a>() ) ); // populate a tool bar with some actions <a href="qtoolbar.html">QToolBar</a> * fileTools = new <a href="qtoolbar.html">QToolBar</a>( this, "file operations" ); <a name="x1172"></a> fileTools-><a href="qtoolbar.html#setLabel">setLabel</a>( "File Operations" ); <a name="x1124"></a> fileOpenAction-><a href="qaction.html#addTo">addTo</a>( fileTools ); fileSaveAction-><a href="qaction.html#addTo">addTo</a>( fileTools ); filePrintAction-><a href="qaction.html#addTo">addTo</a>( fileTools ); (void)QWhatsThis::whatsThisButton( fileTools ); // populate a menu with all actions <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 ); fileNewAction-><a href="qaction.html#addTo">addTo</a>( file ); fileOpenAction-><a href="qaction.html#addTo">addTo</a>( file ); fileSaveAction-><a href="qaction.html#addTo">addTo</a>( file ); fileSaveAsAction-><a href="qaction.html#addTo">addTo</a>( file ); file-><a href="qmenudata.html#insertSeparator">insertSeparator</a>(); filePrintAction-><a href="qaction.html#addTo">addTo</a>( file ); file-><a href="qmenudata.html#insertSeparator">insertSeparator</a>(); fileCloseAction-><a href="qaction.html#addTo">addTo</a>( file ); fileQuitAction-><a href="qaction.html#addTo">addTo</a>( file ); <a href="qmainwindow.html#menuBar">menuBar</a>()->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>()->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 ); // create and define the central widget e = new <a href="qtextedit.html">QTextEdit</a>( this, "editor" ); e-><a href="qwidget.html#setFocus">setFocus</a>(); <a href="qmainwindow.html#setCentralWidget">setCentralWidget</a>( e ); <a href="qmainwindow.html#statusBar">statusBar</a>()->message( "Ready", 2000 ); <a href="qwidget.html#resize">resize</a>( 450, 600 ); } ApplicationWindow::~ApplicationWindow() { delete printer; } void <a name="f376"></a>ApplicationWindow::newDoc() { ApplicationWindow *ed = new ApplicationWindow; ed-><a href="qwidget.html#show">show</a>(); } void <a name="f377"></a>ApplicationWindow::choose() { <a name="x1132"></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>()->message( "Loading aborted", 2000 ); } void <a name="f378"></a>ApplicationWindow::load( const <a href="qstring.html">QString</a> &fileName ) { <a href="qfile.html">QFile</a> f( fileName ); 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( &f ); <a name="x1171"></a><a name="x1168"></a> e-><a href="qtextedit.html#setText">setText</a>( ts.<a href="qtextstream.html#read">read</a>() ); <a name="x1167"></a> e-><a href="qtextedit.html#setModified">setModified</a>( FALSE ); <a href="qwidget.html#setCaption">setCaption</a>( fileName ); <a href="qmainwindow.html#statusBar">statusBar</a>()->message( "Loaded document " + fileName, 2000 ); } void <a name="f379"></a>ApplicationWindow::save() { if ( filename.isEmpty() ) { saveAs(); return; } <a name="x1170"></a> <a href="qstring.html">QString</a> text = e-><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>()->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>(); e-><a href="qtextedit.html#setModified">setModified</a>( FALSE ); <a href="qwidget.html#setCaption">setCaption</a>( filename ); <a href="qmainwindow.html#statusBar">statusBar</a>()->message( QString( "File %1 saved" ).arg( filename ), 2000 ); } void <a name="f380"></a>ApplicationWindow::saveAs() { <a name="x1133"></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>()->message( "Saving aborted", 2000 ); } } void <a name="f381"></a>ApplicationWindow::print() { <a name="x1150"></a> printer-><a href="qprinter.html#setFullPage">setFullPage</a>( TRUE ); <a name="x1151"></a> if ( printer-><a href="qprinter.html#setup">setup</a>(this) ) { // printer dialog <a href="qmainwindow.html#statusBar">statusBar</a>()->message( "Printing..." ); <a href="qpainter.html">QPainter</a> p; if( !p.<a href="qpainter.html#begin">begin</a>( printer ) ) { // paint on printer <a href="qmainwindow.html#statusBar">statusBar</a>()->message( "Printing aborted", 2000 ); return; } <a name="x1145"></a> <a href="qpaintdevicemetrics.html">QPaintDeviceMetrics</a> metrics( p.<a href="qpainter.html#device">device</a>() ); <a name="x1142"></a> int dpiy = metrics.<a href="qpaintdevicemetrics.html#logicalDpiY">logicalDpiY</a>(); int margin = (int) ( (2/2.54)*dpiy ); // 2 cm margins <a name="x1143"></a><a name="x1141"></a> <a href="qrect.html">QRect</a> view( margin, margin, metrics.<a href="qpaintdevicemetrics.html#width">width</a>() - 2*margin, metrics.<a href="qpaintdevicemetrics.html#height">height</a>() - 2*margin ); <a name="x1163"></a> <a href="qsimplerichtext.html">QSimpleRichText</a> richText( QStyleSheet::<a href="qstylesheet.html#convertFromPlainText">convertFromPlainText</a>(e-><a href="qtextedit.html#text">text</a>()), QFont(), <a name="x1164"></a> e-><a href="qtextedit.html#context">context</a>(), <a name="x1169"></a> e-><a href="qtextedit.html#styleSheet">styleSheet</a>(), <a name="x1166"></a> e-><a href="qtextedit.html#mimeSourceFactory">mimeSourceFactory</a>(), view.<a href="qrect.html#height">height</a>() ); <a name="x1160"></a> richText.<a href="qsimplerichtext.html#setWidth">setWidth</a>( &p, view.<a href="qrect.html#width">width</a>() ); int page = 1; do { <a name="x1158"></a> richText.<a href="qsimplerichtext.html#draw">draw</a>( &p, margin, margin, view, colorGroup() ); <a name="x1154"></a> view.<a href="qrect.html#moveBy">moveBy</a>( 0, view.<a href="qrect.html#height">height</a>() ); <a name="x1148"></a> p.<a href="qpainter.html#translate">translate</a>( 0 , -view.<a href="qrect.html#height">height</a>() ); <a name="x1155"></a><a name="x1147"></a> p.<a href="qpainter.html#drawText">drawText</a>( view.<a href="qrect.html#right">right</a>() - p.<a href="qpainter.html#fontMetrics">fontMetrics</a>().width( QString::<a href="qstring.html#number">number</a>( page ) ), <a name="x1152"></a> view.<a href="qrect.html#bottom">bottom</a>() + p.<a href="qpainter.html#fontMetrics">fontMetrics</a>().ascent() + 5, QString::number( page ) ); <a name="x1159"></a> if ( view.<a href="qrect.html#top">top</a>() - margin >= richText.<a href="qsimplerichtext.html#height">height</a>() ) break; <a name="x1149"></a> printer-><a href="qprinter.html#newPage">newPage</a>(); page++; } while (TRUE); <a href="qmainwindow.html#statusBar">statusBar</a>()->message( "Printing completed", 2000 ); } else { <a href="qmainwindow.html#statusBar">statusBar</a>()->message( "Printing aborted", 2000 ); } } <a name="x1173"></a>void ApplicationWindow::<a href="qwidget.html#closeEvent">closeEvent</a>( <a href="qcloseevent.html">QCloseEvent</a>* ce ) { <a name="x1165"></a> if ( !e-><a href="qtextedit.html#isModified">isModified</a>() ) { <a name="x1128"></a> ce-><a href="qcloseevent.html#accept">accept</a>(); return; } <a name="x1139"></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-><a href="qcloseevent.html#accept">accept</a>(); break; case 1: default: // just for sanity <a name="x1129"></a> ce-><a href="qcloseevent.html#ignore">ignore</a>(); break; case 2: ce-><a href="qcloseevent.html#accept">accept</a>(); break; } } void <a name="f382"></a>ApplicationWindow::about() { <a name="x1137"></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="f383"></a>ApplicationWindow::aboutQt() { <a name="x1138"></a> QMessageBox::<a href="qmessagebox.html#aboutQt">aboutQt</a>( this, "Qt Application Example" ); } </pre> <p> <hr> <p> Main: <p> <pre>/**************************************************************************** ** $Id: qt/main.cpp 3.3.8 edited Jan 11 14:36 $ ** ** Copyright (C) 1992-2007 Trolltech ASA. 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>( "Document 1" ); <a name="x1178"></a> mw-><a href="qwidget.html#show">show</a>(); <a name="x1179"></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>()) ); return a.<a href="qapplication.html#exec">exec</a>(); } </pre> <p>See also <a href="qaction-examples.html">QAction Examples</a>. <!-- eof --> <p><address><hr><div align=center> <table width=100% cellspacing=0 border=0><tr> <td>Copyright © 2007 <a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a> <td align=right><div align=right>Qt 3.3.8</div> </table></div></address></body> </html>