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| author | Timothy Pearson <kb9vqf@pearsoncomputing.net> | 2011-07-10 15:24:15 -0500 |
|---|---|---|
| committer | Timothy Pearson <kb9vqf@pearsoncomputing.net> | 2011-07-10 15:24:15 -0500 |
| commit | bd0f3345a938b35ce6a12f6150373b0955b8dd12 (patch) | |
| tree | 7a520322212d48ebcb9fbe1087e7fca28b76185c /doc/html/simple-application-example.html | |
| download | qt3-bd0f3345a938b35ce6a12f6150373b0955b8dd12.tar.gz qt3-bd0f3345a938b35ce6a12f6150373b0955b8dd12.zip | |
Add Qt3 development HEAD version
Diffstat (limited to 'doc/html/simple-application-example.html')
| -rw-r--r-- | doc/html/simple-application-example.html | 425 |
1 files changed, 425 insertions, 0 deletions
diff --git a/doc/html/simple-application-example.html b/doc/html/simple-application-example.html new file mode 100644 index 0000000..b8a5ef7 --- /dev/null +++ b/doc/html/simple-application-example.html @@ -0,0 +1,425 @@ +<!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/application/application.doc:5 --> +<html> +<head> +<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> +<title>A Complete Application Window</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</h1> + + +<p> +<p> This example program looks like a complete modern application. It +has a menu bar, it has a tool bar, it has a status bar and works +like a simple text editor. +<p> There is a <a href="simple-application.html">walkthrough</a> of +this example. +<p> <hr> +<p> Header file: +<p> <pre>/**************************************************************************** +** $Id: qt/application.h 3.3.8 edited Jan 11 14:37 $ +** +** 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 14:37 $ +** +** 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="qsimplerichtext-h.html">qsimplerichtext.h</a>> + +#include "filesave.xpm" +#include "fileopen.xpm" +#include "fileprint.xpm" + +<a name="f459"></a>ApplicationWindow::ApplicationWindow() + : <a href="qmainwindow.html">QMainWindow</a>( 0, "example application main window", WDestructiveClose | WGroupLeader ) +{ + printer = new <a href="qprinter.html">QPrinter</a>( QPrinter::HighResolution ); + <a href="qpixmap.html">QPixmap</a> openIcon, saveIcon, printIcon; + + <a href="qtoolbar.html">QToolBar</a> * fileTools = new <a href="qtoolbar.html">QToolBar</a>( this, "file operations" ); +<a name="x1590"></a> fileTools-><a href="qtoolbar.html#setLabel">setLabel</a>( "File Operations" ); + + 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(choose()), 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" ); + + printIcon = QPixmap( fileprint ); + QToolButton * filePrint + = new <a href="qtoolbutton.html">QToolButton</a>( printIcon, "Print File", QString::null, + this, SLOT(print()), fileTools, "print file" ); + + + (void)QWhatsThis::whatsThisButton( fileTools ); + + 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="x1591"></a> QWhatsThis::<a href="qwhatsthis.html#add">add</a>( fileOpen, fileOpenText ); + +<a name="x1558"></a> QMimeSourceFactory::<a href="qmimesourcefactory.html#defaultFactory">defaultFactory</a>()->setPixmap( "fileopen", openIcon ); + + 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>"; + + QWhatsThis::<a href="qwhatsthis.html#add">add</a>( fileSave, fileSaveText ); + + 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."; + + QWhatsThis::<a href="qwhatsthis.html#add">add</a>( filePrint, filePrintText ); + + + <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 ); + + + file-><a href="qmenudata.html#insertItem">insertItem</a>( "&New", this, SLOT(newDoc()), CTRL+Key_N ); + + int id; + id = file-><a href="qmenudata.html#insertItem">insertItem</a>( openIcon, "&Open...", + this, SLOT(choose()), CTRL+Key_O ); +<a name="x1554"></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 ); + + 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 ); + + file-><a href="qmenudata.html#insertSeparator">insertSeparator</a>(); + + file-><a href="qmenudata.html#insertItem">insertItem</a>( "&Close", this, SLOT(<a href="qwidget.html#close">close</a>()), CTRL+Key_W ); + +<a name="x1544"></a> file-><a href="qmenudata.html#insertItem">insertItem</a>( "&Quit", qApp, SLOT( <a href="qapplication.html#closeAllWindows">closeAllWindows</a>() ), CTRL+Key_Q ); + + <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 ); + + 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="f460"></a>ApplicationWindow::newDoc() +{ + ApplicationWindow *ed = new ApplicationWindow; + ed-><a href="qwidget.html#setCaption">setCaption</a>("Qt Example - Application"); + ed-><a href="qwidget.html#show">show</a>(); +} + +void <a name="f461"></a>ApplicationWindow::choose() +{ +<a name="x1549"></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>() ) + load( fn ); + else + <a href="qmainwindow.html#statusBar">statusBar</a>()->message( "Loading aborted", 2000 ); +} + + +void <a name="f462"></a>ApplicationWindow::load( const <a href="qstring.html">QString</a> &fileName ) +{ + <a href="qfile.html">QFile</a> f( fileName ); +<a name="x1548"></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( &f ); +<a name="x1589"></a><a name="x1586"></a> e-><a href="qtextedit.html#setText">setText</a>( ts.<a href="qtextstream.html#read">read</a>() ); +<a name="x1585"></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="f463"></a>ApplicationWindow::save() +{ + if ( filename.isEmpty() ) { + saveAs(); + return; + } + +<a name="x1588"></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="f464"></a>ApplicationWindow::saveAs() +{ +<a name="x1550"></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="f465"></a>ApplicationWindow::print() +{ +<a name="x1568"></a> printer-><a href="qprinter.html#setFullPage">setFullPage</a>( TRUE ); +<a name="x1569"></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="x1563"></a> <a href="qpaintdevicemetrics.html">QPaintDeviceMetrics</a> metrics( p.<a href="qpainter.html#device">device</a>() ); +<a name="x1560"></a> int dpiy = metrics.<a href="qpaintdevicemetrics.html#logicalDpiY">logicalDpiY</a>(); + int margin = (int) ( (2/2.54)*dpiy ); // 2 cm margins +<a name="x1561"></a><a name="x1559"></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="x1581"></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="x1582"></a> e-><a href="qtextedit.html#context">context</a>(), +<a name="x1587"></a> e-><a href="qtextedit.html#styleSheet">styleSheet</a>(), +<a name="x1584"></a> e-><a href="qtextedit.html#mimeSourceFactory">mimeSourceFactory</a>(), + view.<a href="qrect.html#height">height</a>() ); +<a name="x1578"></a> richText.<a href="qsimplerichtext.html#setWidth">setWidth</a>( &p, view.<a href="qrect.html#width">width</a>() ); + int page = 1; + do { +<a name="x1576"></a> richText.<a href="qsimplerichtext.html#draw">draw</a>( &p, margin, margin, view, colorGroup() ); +<a name="x1572"></a> view.<a href="qrect.html#moveBy">moveBy</a>( 0, view.<a href="qrect.html#height">height</a>() ); +<a name="x1566"></a> p.<a href="qpainter.html#translate">translate</a>( 0 , -view.<a href="qrect.html#height">height</a>() ); +<a name="x1580"></a><a name="x1573"></a><a name="x1565"></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="x1570"></a> view.<a href="qrect.html#bottom">bottom</a>() + p.<a href="qpainter.html#fontMetrics">fontMetrics</a>().ascent() + 5, QString::number( page ) ); +<a name="x1577"></a> if ( view.<a href="qrect.html#top">top</a>() - margin >= richText.<a href="qsimplerichtext.html#height">height</a>() ) + break; +<a name="x1567"></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="x1592"></a>void ApplicationWindow::<a href="qwidget.html#closeEvent">closeEvent</a>( <a href="qcloseevent.html">QCloseEvent</a>* ce ) +{ +<a name="x1583"></a> if ( !e-><a href="qtextedit.html#isModified">isModified</a>() ) { +<a name="x1545"></a> ce-><a href="qcloseevent.html#accept">accept</a>(); + return; + } + +<a name="x1557"></a> switch( QMessageBox::<a href="qmessagebox.html#information">information</a>( this, "Qt Application Example", + "Do you want to save the changes" + " to the document?", + "Yes", "No", "Cancel", + 0, 1 ) ) { + case 0: + save(); + ce-><a href="qcloseevent.html#accept">accept</a>(); + break; + case 1: + ce-><a href="qcloseevent.html#accept">accept</a>(); + break; + case 2: + default: // just for sanity +<a name="x1546"></a> ce-><a href="qcloseevent.html#ignore">ignore</a>(); + break; + } +} + + +void <a name="f466"></a>ApplicationWindow::about() +{ +<a name="x1555"></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="f467"></a>ApplicationWindow::aboutQt() +{ +<a name="x1556"></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 14:37 $ +** +** 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>( "Qt Example - Application" ); +<a name="x1598"></a> mw-><a href="qwidget.html#show">show</a>(); +<a name="x1599"></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="examples.html">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> |