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simple-application-example.html@ 204

Last change on this file since 204 was 190, checked in by rudi, 14 years ago
reference documentation added
File size: 19.6 KB

Line
1	<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
2	<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/examples/application/application.doc:5 -->
3	<html>
4	<head>
5	<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
6	<title>A Complete Application Window</title>
7	<style type="text/css"><!--
8	fn { margin-left: 1cm; text-indent: -1cm; }
9	a:link { color: #004faf; text-decoration: none }
10	a:visited { color: #672967; text-decoration: none }
11	body { background: #ffffff; color: black; }
12	--></style>
13	</head>
14	<body>
15
16	<table border="0" cellpadding="0" cellspacing="0" width="100%">
17	<tr bgcolor="#E5E5E5">
18	<td valign=center>
19	<a href="index.html">
20	<font color="#004faf">Home</font></a>
21	\| <a href="classes.html">
22	<font color="#004faf">All Classes</font></a>
23	\| <a href="mainclasses.html">
24	<font color="#004faf">Main Classes</font></a>
25	\| <a href="annotated.html">
26	<font color="#004faf">Annotated</font></a>
27	\| <a href="groups.html">
28	<font color="#004faf">Grouped Classes</font></a>
29	\| <a href="functions.html">
30	<font color="#004faf">Functions</font></a>
31	</td>
32	<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>
33
34
35	<p>
36	<p> This example program looks like a complete modern application. It
37	has a menu bar, it has a tool bar, it has a status bar and works
38	like a simple text editor.
39	<p> There is a <a href="simple-application.html">walkthrough</a> of
40	this example.
41	<p> <hr>
42	<p> Header file:
43	<p> <pre>/****************************************************************************
44	** $Id: simple-application-example.html 2051 2007-02-21 10:04:20Z chehrlic $
45	**
46	** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
47	**
48	** This file is part of an example program for Qt. This example
49	** program may be used, distributed and modified without limitation.
50	**
51	*****************************************************************************/
52
53	#ifndef APPLICATION_H
54	#define APPLICATION_H
55
56	#include <<a href="qmainwindow-h.html">qmainwindow.h</a>>
57
58	class QTextEdit;
59
60	class ApplicationWindow: public <a href="qmainwindow.html">QMainWindow</a>
61	{
62	<a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
63
64	public:
65	ApplicationWindow();
66	~ApplicationWindow();
67
68	protected:
69	void closeEvent( <a href="qcloseevent.html">QCloseEvent</a>* );
70
71	private slots:
72	void newDoc();
73	void choose();
74	void load( const <a href="qstring.html">QString</a> &fileName );
75	void save();
76	void saveAs();
77	void print();
78
79	void about();
80	void aboutQt();
81
82	private:
83	<a href="qprinter.html">QPrinter</a> *printer;
84	<a href="qtextedit.html">QTextEdit</a> *e;
85	<a href="qstring.html">QString</a> filename;
86	};
87
88
89	#endif
90	</pre>
91
92	<p> <hr>
93	<p> Implementation:
94	<p> <pre>/****************************************************************************
95	** $Id: simple-application-example.html 2051 2007-02-21 10:04:20Z chehrlic $
96	**
97	** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
98	**
99	** This file is part of an example program for Qt. This example
100	** program may be used, distributed and modified without limitation.
101	**
102	*****************************************************************************/
103
104	#include "application.h"
105
106	#include <<a href="qimage-h.html">qimage.h</a>>
107	#include <<a href="qpixmap-h.html">qpixmap.h</a>>
108	#include <<a href="qtoolbar-h.html">qtoolbar.h</a>>
109	#include <<a href="qtoolbutton-h.html">qtoolbutton.h</a>>
110	#include <<a href="qpopupmenu-h.html">qpopupmenu.h</a>>
111	#include <<a href="qmenubar-h.html">qmenubar.h</a>>
112	#include <<a href="qtextedit-h.html">qtextedit.h</a>>
113	#include <<a href="qfile-h.html">qfile.h</a>>
114	#include <<a href="qfiledialog-h.html">qfiledialog.h</a>>
115	#include <<a href="qstatusbar-h.html">qstatusbar.h</a>>
116	#include <<a href="qmessagebox-h.html">qmessagebox.h</a>>
117	#include <<a href="qprinter-h.html">qprinter.h</a>>
118	#include <<a href="qapplication-h.html">qapplication.h</a>>
119	#include <<a href="qaccel-h.html">qaccel.h</a>>
120	#include <<a href="qtextstream-h.html">qtextstream.h</a>>
121	#include <<a href="qpainter-h.html">qpainter.h</a>>
122	#include <<a href="qpaintdevicemetrics-h.html">qpaintdevicemetrics.h</a>>
123	#include <<a href="qwhatsthis-h.html">qwhatsthis.h</a>>
124	#include <<a href="qsimplerichtext-h.html">qsimplerichtext.h</a>>
125
126	#include "filesave.xpm"
127	#include "fileopen.xpm"
128	#include "fileprint.xpm"
129
130	<a name="f459"></a>ApplicationWindow::ApplicationWindow()
131	: <a href="qmainwindow.html">QMainWindow</a>( 0, "example application main window", WDestructiveClose \| WGroupLeader )
132	{
133	printer = new <a href="qprinter.html">QPrinter</a>( QPrinter::HighResolution );
134	<a href="qpixmap.html">QPixmap</a> openIcon, saveIcon, printIcon;
135
136	<a href="qtoolbar.html">QToolBar</a> * fileTools = new <a href="qtoolbar.html">QToolBar</a>( this, "file operations" );
137	<a name="x1590"></a> fileTools-><a href="qtoolbar.html#setLabel">setLabel</a>( "File Operations" );
138
139	openIcon = QPixmap( fileopen );
140	QToolButton * fileOpen
141	= new <a href="qtoolbutton.html">QToolButton</a>( openIcon, "Open File", <a href="qstring.html#QString-null">QString::null</a>,
142	this, SLOT(choose()), fileTools, "open file" );
143
144	saveIcon = QPixmap( filesave );
145	QToolButton * fileSave
146	= new <a href="qtoolbutton.html">QToolButton</a>( saveIcon, "Save File", QString::null,
147	this, SLOT(save()), fileTools, "save file" );
148
149	printIcon = QPixmap( fileprint );
150	QToolButton * filePrint
151	= new <a href="qtoolbutton.html">QToolButton</a>( printIcon, "Print File", QString::null,
152	this, SLOT(print()), fileTools, "print file" );
153
154
155	(void)QWhatsThis::whatsThisButton( fileTools );
156
157	const char * fileOpenText = "<p><img source=\"fileopen\"> "
158	"Click this button to open a <em>new file</em>.<br>"
159	"You can also select the <b>Open</b> command "
160	"from the <b>File</b> menu.</p>";
161
162	<a name="x1591"></a> QWhatsThis::<a href="qwhatsthis.html#add">add</a>( fileOpen, fileOpenText );
163
164	<a name="x1558"></a> QMimeSourceFactory::<a href="qmimesourcefactory.html#defaultFactory">defaultFactory</a>()->setPixmap( "fileopen", openIcon );
165
166	const char * fileSaveText = "<p>Click this button to save the file you "
167	"are editing. You will be prompted for a file name.\n"
168	"You can also select the <b>Save</b> command "
169	"from the <b>File</b> menu.</p>";
170
171	QWhatsThis::<a href="qwhatsthis.html#add">add</a>( fileSave, fileSaveText );
172
173	const char * filePrintText = "Click this button to print the file you "
174	"are editing.\n"
175	"You can also select the Print command "
176	"from the File menu.";
177
178	QWhatsThis::<a href="qwhatsthis.html#add">add</a>( filePrint, filePrintText );
179
180
181	<a href="qpopupmenu.html">QPopupMenu</a> * file = new <a href="qpopupmenu.html">QPopupMenu</a>( this );
182	<a href="qmainwindow.html#menuBar">menuBar</a>()->insertItem( "&File", file );
183
184
185	file-><a href="qmenudata.html#insertItem">insertItem</a>( "&New", this, SLOT(newDoc()), CTRL+Key_N );
186
187	int id;
188	id = file-><a href="qmenudata.html#insertItem">insertItem</a>( openIcon, "&Open...",
189	this, SLOT(choose()), CTRL+Key_O );
190	<a name="x1554"></a> file-><a href="qmenudata.html#setWhatsThis">setWhatsThis</a>( id, fileOpenText );
191
192	id = file-><a href="qmenudata.html#insertItem">insertItem</a>( saveIcon, "&Save",
193	this, SLOT(save()), CTRL+Key_S );
194	file-><a href="qmenudata.html#setWhatsThis">setWhatsThis</a>( id, fileSaveText );
195
196	id = file-><a href="qmenudata.html#insertItem">insertItem</a>( "Save &As...", this, SLOT(saveAs()) );
197	file-><a href="qmenudata.html#setWhatsThis">setWhatsThis</a>( id, fileSaveText );
198
199	file-><a href="qmenudata.html#insertSeparator">insertSeparator</a>();
200
201	id = file-><a href="qmenudata.html#insertItem">insertItem</a>( printIcon, "&Print...",
202	this, SLOT(print()), CTRL+Key_P );
203	file-><a href="qmenudata.html#setWhatsThis">setWhatsThis</a>( id, filePrintText );
204
205	file-><a href="qmenudata.html#insertSeparator">insertSeparator</a>();
206
207	file-><a href="qmenudata.html#insertItem">insertItem</a>( "&Close", this, SLOT(<a href="qwidget.html#close">close</a>()), CTRL+Key_W );
208
209	<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 );
210
211	<a href="qmainwindow.html#menuBar">menuBar</a>()->insertSeparator();
212
213	<a href="qpopupmenu.html">QPopupMenu</a> * help = new <a href="qpopupmenu.html">QPopupMenu</a>( this );
214	<a href="qmainwindow.html#menuBar">menuBar</a>()->insertItem( "&Help", help );
215
216	help-><a href="qmenudata.html#insertItem">insertItem</a>( "&About", this, SLOT(about()), Key_F1 );
217	help-><a href="qmenudata.html#insertItem">insertItem</a>( "About &Qt", this, SLOT(aboutQt()) );
218	help-><a href="qmenudata.html#insertSeparator">insertSeparator</a>();
219	help-><a href="qmenudata.html#insertItem">insertItem</a>( "What's &This", this, SLOT(<a href="qmainwindow.html#whatsThis">whatsThis</a>()), SHIFT+Key_F1 );
220
221	e = new <a href="qtextedit.html">QTextEdit</a>( this, "editor" );
222	e-><a href="qwidget.html#setFocus">setFocus</a>();
223	<a href="qmainwindow.html#setCentralWidget">setCentralWidget</a>( e );
224	<a href="qmainwindow.html#statusBar">statusBar</a>()->message( "Ready", 2000 );
225
226	<a href="qwidget.html#resize">resize</a>( 450, 600 );
227	}
228
229
230	ApplicationWindow::~ApplicationWindow()
231	{
232	delete printer;
233	}
234
235
236
237	void <a name="f460"></a>ApplicationWindow::newDoc()
238	{
239	ApplicationWindow *ed = new ApplicationWindow;
240	ed-><a href="qwidget.html#setCaption">setCaption</a>("Qt Example - Application");
241	ed-><a href="qwidget.html#show">show</a>();
242	}
243
244	void <a name="f461"></a>ApplicationWindow::choose()
245	{
246	<a name="x1549"></a> <a href="qstring.html">QString</a> fn = QFileDialog::<a href="qfiledialog.html#getOpenFileName">getOpenFileName</a>( QString::null, QString::null,
247	this);
248	if ( !fn.<a href="qstring.html#isEmpty">isEmpty</a>() )
249	load( fn );
250	else
251	<a href="qmainwindow.html#statusBar">statusBar</a>()->message( "Loading aborted", 2000 );
252	}
253
254
255	void <a name="f462"></a>ApplicationWindow::load( const <a href="qstring.html">QString</a> &fileName )
256	{
257	<a href="qfile.html">QFile</a> f( fileName );
258	<a name="x1548"></a> if ( !f.<a href="qfile.html#open">open</a>( <a href="qfile.html#open">IO_ReadOnly</a> ) )
259	return;
260
261	<a href="qtextstream.html">QTextStream</a> ts( &f );
262	<a name="x1589"></a><a name="x1586"></a> e-><a href="qtextedit.html#setText">setText</a>( ts.<a href="qtextstream.html#read">read</a>() );
263	<a name="x1585"></a> e-><a href="qtextedit.html#setModified">setModified</a>( FALSE );
264	<a href="qwidget.html#setCaption">setCaption</a>( fileName );
265	<a href="qmainwindow.html#statusBar">statusBar</a>()->message( "Loaded document " + fileName, 2000 );
266	}
267
268
269	void <a name="f463"></a>ApplicationWindow::save()
270	{
271	if ( filename.isEmpty() ) {
272	saveAs();
273	return;
274	}
275
276	<a name="x1588"></a> <a href="qstring.html">QString</a> text = e-><a href="qtextedit.html#text">text</a>();
277	<a href="qfile.html">QFile</a> f( filename );
278	if ( !f.<a href="qfile.html#open">open</a>( <a href="qfile.html#open">IO_WriteOnly</a> ) ) {
279	<a href="qmainwindow.html#statusBar">statusBar</a>()->message( QString("Could not write to %1").arg(filename),
280	2000 );
281	return;
282	}
283
284	<a href="qtextstream.html">QTextStream</a> t( &f );
285	t << text;
286	f.<a href="qfile.html#close">close</a>();
287
288	e-><a href="qtextedit.html#setModified">setModified</a>( FALSE );
289
290	<a href="qwidget.html#setCaption">setCaption</a>( filename );
291
292	<a href="qmainwindow.html#statusBar">statusBar</a>()->message( QString( "File %1 saved" ).arg( filename ), 2000 );
293	}
294
295
296	void <a name="f464"></a>ApplicationWindow::saveAs()
297	{
298	<a name="x1550"></a> <a href="qstring.html">QString</a> fn = QFileDialog::<a href="qfiledialog.html#getSaveFileName">getSaveFileName</a>( QString::null, QString::null,
299	this );
300	if ( !fn.<a href="qstring.html#isEmpty">isEmpty</a>() ) {
301	filename = fn;
302	save();
303	} else {
304	<a href="qmainwindow.html#statusBar">statusBar</a>()->message( "Saving aborted", 2000 );
305	}
306	}
307
308
309	void <a name="f465"></a>ApplicationWindow::print()
310	{
311	<a name="x1568"></a> printer-><a href="qprinter.html#setFullPage">setFullPage</a>( TRUE );
312	<a name="x1569"></a> if ( printer-><a href="qprinter.html#setup">setup</a>(this) ) { // printer dialog
313	<a href="qmainwindow.html#statusBar">statusBar</a>()->message( "Printing..." );
314	<a href="qpainter.html">QPainter</a> p;
315	if( !p.<a href="qpainter.html#begin">begin</a>( printer ) ) { // paint on printer
316	<a href="qmainwindow.html#statusBar">statusBar</a>()->message( "Printing aborted", 2000 );
317	return;
318	}
319
320	<a name="x1563"></a> <a href="qpaintdevicemetrics.html">QPaintDeviceMetrics</a> metrics( p.<a href="qpainter.html#device">device</a>() );
321	<a name="x1560"></a> int dpiy = metrics.<a href="qpaintdevicemetrics.html#logicalDpiY">logicalDpiY</a>();
322	int margin = (int) ( (2/2.54)*dpiy ); // 2 cm margins
323	<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>() - 2margin, metrics.<a href="qpaintdevicemetrics.html#height">height</a>() - 2margin );
324	<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>()),
325	QFont(),
326	<a name="x1582"></a> e-><a href="qtextedit.html#context">context</a>(),
327	<a name="x1587"></a> e-><a href="qtextedit.html#styleSheet">styleSheet</a>(),
328	<a name="x1584"></a> e-><a href="qtextedit.html#mimeSourceFactory">mimeSourceFactory</a>(),
329	view.<a href="qrect.html#height">height</a>() );
330	<a name="x1578"></a> richText.<a href="qsimplerichtext.html#setWidth">setWidth</a>( &p, view.<a href="qrect.html#width">width</a>() );
331	int page = 1;
332	do {
333	<a name="x1576"></a> richText.<a href="qsimplerichtext.html#draw">draw</a>( &p, margin, margin, view, colorGroup() );
334	<a name="x1572"></a> view.<a href="qrect.html#moveBy">moveBy</a>( 0, view.<a href="qrect.html#height">height</a>() );
335	<a name="x1566"></a> p.<a href="qpainter.html#translate">translate</a>( 0 , -view.<a href="qrect.html#height">height</a>() );
336	<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 ) ),
337	<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 ) );
338	<a name="x1577"></a> if ( view.<a href="qrect.html#top">top</a>() - margin >= richText.<a href="qsimplerichtext.html#height">height</a>() )
339	break;
340	<a name="x1567"></a> printer-><a href="qprinter.html#newPage">newPage</a>();
341	page++;
342	} while (TRUE);
343
344	<a href="qmainwindow.html#statusBar">statusBar</a>()->message( "Printing completed", 2000 );
345	} else {
346	<a href="qmainwindow.html#statusBar">statusBar</a>()->message( "Printing aborted", 2000 );
347	}
348	}
349
350	<a name="x1592"></a>void ApplicationWindow::<a href="qwidget.html#closeEvent">closeEvent</a>( <a href="qcloseevent.html">QCloseEvent</a>* ce )
351	{
352	<a name="x1583"></a> if ( !e-><a href="qtextedit.html#isModified">isModified</a>() ) {
353	<a name="x1545"></a> ce-><a href="qcloseevent.html#accept">accept</a>();
354	return;
355	}
356
357	<a name="x1557"></a> switch( QMessageBox::<a href="qmessagebox.html#information">information</a>( this, "Qt Application Example",
358	"Do you want to save the changes"
359	" to the document?",
360	"Yes", "No", "Cancel",
361	0, 1 ) ) {
362	case 0:
363	save();
364	ce-><a href="qcloseevent.html#accept">accept</a>();
365	break;
366	case 1:
367	ce-><a href="qcloseevent.html#accept">accept</a>();
368	break;
369	case 2:
370	default: // just for sanity
371	<a name="x1546"></a> ce-><a href="qcloseevent.html#ignore">ignore</a>();
372	break;
373	}
374	}
375
376
377	void <a name="f466"></a>ApplicationWindow::about()
378	{
379	<a name="x1555"></a> QMessageBox::<a href="qmessagebox.html#about">about</a>( this, "Qt Application Example",
380	"This example demonstrates simple use of "
381	"QMainWindow,\nQMenuBar and QToolBar.");
382	}
383
384
385	void <a name="f467"></a>ApplicationWindow::aboutQt()
386	{
387	<a name="x1556"></a> QMessageBox::<a href="qmessagebox.html#aboutQt">aboutQt</a>( this, "Qt Application Example" );
388	}
389	</pre>
390
391	<p> <hr>
392	<p> Main:
393	<p> <pre>/****************************************************************************
394	** $Id: simple-application-example.html 2051 2007-02-21 10:04:20Z chehrlic $
395	**
396	** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
397	**
398	** This file is part of an example program for Qt. This example
399	** program may be used, distributed and modified without limitation.
400	**
401	*****************************************************************************/
402
403	#include <<a href="qapplication-h.html">qapplication.h</a>>
404	#include "application.h"
405
406	int main( int argc, char ** argv ) {
407	<a href="qapplication.html">QApplication</a> a( argc, argv );
408	ApplicationWindow *mw = new ApplicationWindow();
409	mw-><a href="qwidget.html#setCaption">setCaption</a>( "Qt Example - Application" );
410	<a name="x1598"></a> mw-><a href="qwidget.html#show">show</a>();
411	<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>()) );
412	return a.<a href="qapplication.html#exec">exec</a>();
413	}
414	</pre>
415
416	<p>See also <a href="examples.html">Examples</a>.
417
418	<!-- eof -->
419	<p><address><hr><div align=center>
420	<table width=100% cellspacing=0 border=0><tr>
421	<td>Copyright © 2007
422	<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
423	<td align=right><div align=right>Qt 3.3.8</div>
424	</table></div></address></body>
425	</html>

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