source: trunk/doc/html/progress-example.html

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2<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/examples/progress/progress.doc:4 -->
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5<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
6<title>Progress Bar and Dialog Example</title>
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32<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>Progress Bar and Dialog Example</h1>
33
34
35<p>
36This example displays either a simple (text-only) or a
37custom-labelled (user-supplied widget) progress dialog. It also
38demonstrates simple use of menus.
39<hr>
40<p> Implementation:
41<p> <pre>/****************************************************************************
42** $Id: progress-example.html 2051 2007-02-21 10:04:20Z chehrlic $
43**
44** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
45**
46** This file is part of an example program for Qt. This example
47** program may be used, distributed and modified without limitation.
48**
49*****************************************************************************/
50
51#include &lt;<a href="qprogressdialog-h.html">qprogressdialog.h</a>&gt;
52#include &lt;<a href="qapplication-h.html">qapplication.h</a>&gt;
53#include &lt;<a href="qmenubar-h.html">qmenubar.h</a>&gt;
54#include &lt;<a href="qpopupmenu-h.html">qpopupmenu.h</a>&gt;
55#include &lt;<a href="qpainter-h.html">qpainter.h</a>&gt;
56#include &lt;stdlib.h&gt;
57
58class AnimatedThingy : public <a href="qlabel.html">QLabel</a> {
59public:
60 AnimatedThingy( <a href="qwidget.html">QWidget</a>* parent, const <a href="qstring.html">QString</a>&amp; s ) :
61 <a href="qlabel.html">QLabel</a>(parent),
62 label(s),
63 step(0)
64 {
65 setBackgroundColor(white);
66 label+="\n... and wasting CPU\nwith this animation!\n";
67
68 for (int i=0; i&lt;nqix; i++)
69 ox[0][i] = oy[0][i] = ox[1][i] = oy[1][i] = 0;
70 x0 = y0 = x1 = y1 = 0;
71 dx0 = rand()%8+2;
72 dy0 = rand()%8+2;
73 dx1 = rand()%8+2;
74 dy1 = rand()%8+2;
75 }
76
77 void show()
78 {
79 if (!isVisible()) startTimer(100);
80 QWidget::<a href="qwidget.html#show">show</a>();
81 }
82
83 void hide()
84 {
85<a name="x89"></a> QWidget::<a href="qwidget.html#hide">hide</a>();
86 killTimers();
87 }
88
89 <a href="qsize.html">QSize</a> sizeHint() const
90 {
91 return QSize(120,100);
92 }
93
94protected:
95 void timerEvent(QTimerEvent*)
96 {
97 <a href="qpainter.html">QPainter</a> p(this);
98<a name="x76"></a> <a href="qpen.html">QPen</a> pn=p.<a href="qpainter.html#pen">pen</a>();
99<a name="x80"></a> pn.<a href="qpen.html#setWidth">setWidth</a>(2);
100<a name="x79"></a> pn.<a href="qpen.html#setColor">setColor</a>(backgroundColor());
101<a name="x78"></a> p.<a href="qpainter.html#setPen">setPen</a>(pn);
102
103 step = (step + 1) % nqix;
104
105<a name="x73"></a> p.<a href="qpainter.html#drawLine">drawLine</a>(ox[0][step], oy[0][step], ox[1][step], oy[1][step]);
106
107 inc(x0, dx0, width());
108 inc(y0, dy0, height());
109 inc(x1, dx1, width());
110 inc(y1, dy1, height());
111 ox[0][step] = x0;
112 oy[0][step] = y0;
113 ox[1][step] = x1;
114 oy[1][step] = y1;
115
116 <a href="qcolor.html">QColor</a> c;
117<a name="x66"></a> c.<a href="qcolor.html#setHsv">setHsv</a>( (step*255)/nqix, 255, 255 ); // rainbow effect
118 pn.<a href="qpen.html#setColor">setColor</a>(c);
119 p.<a href="qpainter.html#setPen">setPen</a>(pn);
120 p.<a href="qpainter.html#drawLine">drawLine</a>(ox[0][step], oy[0][step], ox[1][step], oy[1][step]);
121 p.<a href="qpainter.html#setPen">setPen</a>(colorGroup().text());
122<a name="x74"></a> p.<a href="qpainter.html#drawText">drawText</a>(rect(), AlignCenter, label);
123 }
124
125 void paintEvent(QPaintEvent* event)
126 {
127 <a href="qpainter.html">QPainter</a> p(this);
128 <a href="qpen.html">QPen</a> pn=p.<a href="qpainter.html#pen">pen</a>();
129 pn.<a href="qpen.html#setWidth">setWidth</a>(2);
130 p.<a href="qpainter.html#setPen">setPen</a>(pn);
131<a name="x77"></a> p.<a href="qpainter.html#setClipRect">setClipRect</a>(event-&gt;rect());
132 for (int i=0; i&lt;nqix; i++) {
133 <a href="qcolor.html">QColor</a> c;
134 c.<a href="qcolor.html#setHsv">setHsv</a>( (i*255)/nqix, 255, 255 ); // rainbow effect
135 pn.<a href="qpen.html#setColor">setColor</a>(c);
136 p.<a href="qpainter.html#setPen">setPen</a>(pn);
137 p.<a href="qpainter.html#drawLine">drawLine</a>(ox[0][i], oy[0][i], ox[1][i], oy[1][i]);
138 }
139 p.<a href="qpainter.html#setPen">setPen</a>(colorGroup().text());
140 p.<a href="qpainter.html#drawText">drawText</a>(rect(), AlignCenter, label);
141 }
142
143private:
144 void inc(int&amp; x, int&amp; dx, int b)
145 {
146 x+=dx;
147 if (x&lt;0) { x=0; dx=rand()%8+2; }
148 else if (x&gt;=b) { x=b-1; dx=-(rand()%8+2); }
149 }
150
151 enum {nqix=10};
152 int ox[2][nqix];
153 int oy[2][nqix];
154 int x0,y0,x1,y1;
155 int dx0,dy0,dx1,dy1;
156 <a href="qstring.html">QString</a> label;
157 int step;
158};
159
160
161class CPUWaster : public <a href="qwidget.html">QWidget</a>
162{
163 <a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
164
165 enum { first_draw_item = 1000, last_draw_item = 1006 };
166
167 int drawItemRects(int id)
168 {
169 int n = id - first_draw_item;
170 int r = 100;
171 while (n--) r*=(n%3 ? 5 : 4);
172 return r;
173 }
174 <a href="qstring.html">QString</a> drawItemText(int id)
175 {
176 <a href="qstring.html">QString</a> str;
177 str.<a href="qstring.html#sprintf">sprintf</a>("%d Rectangles", drawItemRects(id));
178 return str;
179 }
180
181public:
182 CPUWaster() :
183 pb(0)
184 {
185 menubar = new <a href="qmenubar.html">QMenuBar</a>( this, "menu" );
186 <a href="qapplication.html#Q_CHECK_PTR">Q_CHECK_PTR</a>( menubar );
187
188 <a href="qpopupmenu.html">QPopupMenu</a>* file = new <a href="qpopupmenu.html">QPopupMenu</a>();
189 <a href="qapplication.html#Q_CHECK_PTR">Q_CHECK_PTR</a>( file );
190 menubar-&gt;<a href="qmenudata.html#insertItem">insertItem</a>( "&amp;File", file );
191 for (int i=first_draw_item; i&lt;=last_draw_item; i++)
192 file-&gt;<a href="qmenudata.html#insertItem">insertItem</a>( drawItemText(i), i );
193<a name="x67"></a> connect( menubar, SIGNAL(<a href="qmenubar.html#activated">activated</a>(int)), this, SLOT(doMenuItem(int)) );
194<a name="x69"></a> file-&gt;<a href="qmenudata.html#insertSeparator">insertSeparator</a>();
195 file-&gt;<a href="qmenudata.html#insertItem">insertItem</a>( "Quit", qApp, SLOT(<a href="qapplication.html#quit">quit</a>()) );
196
197 options = new <a href="qpopupmenu.html">QPopupMenu</a>();
198 <a href="qapplication.html#Q_CHECK_PTR">Q_CHECK_PTR</a>( options );
199 menubar-&gt;<a href="qmenudata.html#insertItem">insertItem</a>( "&amp;Options", options );
200 td_id = options-&gt;<a href="qmenudata.html#insertItem">insertItem</a>( "Timer driven", this, SLOT(timerDriven()) );
201 ld_id = options-&gt;<a href="qmenudata.html#insertItem">insertItem</a>( "Loop driven", this, SLOT(loopDriven()) );
202 options-&gt;<a href="qmenudata.html#insertSeparator">insertSeparator</a>();
203 dl_id = options-&gt;<a href="qmenudata.html#insertItem">insertItem</a>( "Default label", this, SLOT(defaultLabel()) );
204 cl_id = options-&gt;<a href="qmenudata.html#insertItem">insertItem</a>( "Custom label", this, SLOT(customLabel()) );
205 options-&gt;<a href="qmenudata.html#insertSeparator">insertSeparator</a>();
206 md_id = options-&gt;<a href="qmenudata.html#insertItem">insertItem</a>( "No minimum duration", this, SLOT(toggleMinimumDuration()) );
207<a name="x81"></a> options-&gt;<a href="qpopupmenu.html#setCheckable">setCheckable</a>( TRUE );
208 loopDriven();
209 defaultLabel();
210
211 setFixedSize( 400, 300 );
212
213 setBackgroundColor( black );
214 }
215
216public slots:
217 void doMenuItem(int id)
218 {
219 if (id &gt;= first_draw_item &amp;&amp; id &lt;= last_draw_item)
220 draw(drawItemRects(id));
221 }
222
223 void stopDrawing() { got_stop = TRUE; }
224
225 void timerDriven()
226 {
227 timer_driven = TRUE;
228<a name="x71"></a> options-&gt;<a href="qmenudata.html#setItemChecked">setItemChecked</a>( td_id, TRUE );
229 options-&gt;<a href="qmenudata.html#setItemChecked">setItemChecked</a>( ld_id, FALSE );
230 }
231
232 void loopDriven()
233 {
234 timer_driven = FALSE;
235 options-&gt;<a href="qmenudata.html#setItemChecked">setItemChecked</a>( ld_id, TRUE );
236 options-&gt;<a href="qmenudata.html#setItemChecked">setItemChecked</a>( td_id, FALSE );
237 }
238
239 void defaultLabel()
240 {
241 default_label = TRUE;
242 options-&gt;<a href="qmenudata.html#setItemChecked">setItemChecked</a>( dl_id, TRUE );
243 options-&gt;<a href="qmenudata.html#setItemChecked">setItemChecked</a>( cl_id, FALSE );
244 }
245
246 void customLabel()
247 {
248 default_label = FALSE;
249 options-&gt;<a href="qmenudata.html#setItemChecked">setItemChecked</a>( dl_id, FALSE );
250 options-&gt;<a href="qmenudata.html#setItemChecked">setItemChecked</a>( cl_id, TRUE );
251 }
252
253 void toggleMinimumDuration()
254 {
255 options-&gt;<a href="qmenudata.html#setItemChecked">setItemChecked</a>( md_id,
256<a name="x70"></a> !options-&gt;<a href="qmenudata.html#isItemChecked">isItemChecked</a>( md_id ) );
257 }
258
259private:
260 void timerEvent( <a href="qtimerevent.html">QTimerEvent</a>* )
261 {
262 if (!got_stop)
263<a name="x86"></a><a name="x85"></a> pb-&gt;<a href="qprogressdialog.html#setProgress">setProgress</a>( pb-&gt;<a href="qprogressdialog.html#totalSteps">totalSteps</a>() - rects );
264 rects--;
265
266 {
267 <a href="qpainter.html">QPainter</a> p(this);
268
269 int ww = width();
270 int wh = height();
271
272 if ( ww &gt; 8 &amp;&amp; wh &gt; 8 ) {
273 <a href="qcolor.html">QColor</a> c(rand()%255, rand()%255, rand()%255);
274 int x = rand() % (ww-8);
275 int y = rand() % (wh-8);
276 int w = rand() % (ww-x);
277 int h = rand() % (wh-y);
278<a name="x75"></a> p.<a href="qpainter.html#fillRect">fillRect</a>( x, y, w, h, c );
279 }
280 }
281
282 if (!rects || got_stop) {
283 if (!got_stop)
284 pb-&gt;<a href="qprogressdialog.html#setProgress">setProgress</a>( pb-&gt;<a href="qprogressdialog.html#totalSteps">totalSteps</a>() );
285 <a href="qpainter.html">QPainter</a> p(this);
286 p.<a href="qpainter.html#fillRect">fillRect</a>(0, 0, width(), height(), backgroundColor());
287 enableDrawingItems(TRUE);
288 killTimers();
289 delete pb;
290 pb = 0;
291 }
292 }
293
294 <a href="qprogressdialog.html">QProgressDialog</a>* newProgressDialog( const char* label, int steps, bool modal )
295 {
296 <a href="qprogressdialog.html">QProgressDialog</a> *d = new <a href="qprogressdialog.html">QProgressDialog</a>(label, "Cancel", steps, this,
297 "progress", modal);
298 if ( options-&gt;<a href="qmenudata.html#isItemChecked">isItemChecked</a>( md_id ) )
299<a name="x84"></a> d-&gt;<a href="qprogressdialog.html#setMinimumDuration">setMinimumDuration</a>(0);
300 if ( !default_label )
301<a name="x83"></a> d-&gt;<a href="qprogressdialog.html#setLabel">setLabel</a>( new AnimatedThingy(d,label) );
302 return d;
303 }
304
305 void enableDrawingItems(bool yes)
306 {
307 for (int i=first_draw_item; i&lt;=last_draw_item; i++) {
308<a name="x72"></a> menubar-&gt;<a href="qmenudata.html#setItemEnabled">setItemEnabled</a>(i, yes);
309 }
310 }
311
312 void draw(int n)
313 {
314 if ( timer_driven ) {
315 if ( pb ) {
316 <a href="qapplication.html#qWarning">qWarning</a>("This cannot happen!");
317 return;
318 }
319 rects = n;
320 pb = newProgressDialog("Drawing rectangles.\n"
321 "Using timer event.", n, FALSE);
322 pb-&gt;<a href="qwidget.html#setCaption">setCaption</a>("Please Wait");
323<a name="x82"></a> connect(pb, SIGNAL(<a href="qprogressdialog.html#cancelled">cancelled</a>()), this, SLOT(stopDrawing()));
324 enableDrawingItems(FALSE);
325 startTimer(0);
326 got_stop = FALSE;
327 } else {
328 <a href="qprogressdialog.html">QProgressDialog</a>* lpb = newProgressDialog(
329 "Drawing rectangles.\nUsing loop.", n, TRUE);
330 lpb-&gt;<a href="qwidget.html#setCaption">setCaption</a>("Please Wait");
331
332 <a href="qpainter.html">QPainter</a> p(this);
333 for (int i=0; i&lt;n; i++) {
334 lpb-&gt;<a href="qprogressdialog.html#setProgress">setProgress</a>(i);
335<a name="x87"></a> if ( lpb-&gt;<a href="qprogressdialog.html#wasCancelled">wasCancelled</a>() )
336 break;
337
338 <a href="qcolor.html">QColor</a> c(rand()%255, rand()%255, rand()%255);
339 int x = rand()%(width()-8);
340 int y = rand()%(height()-8);
341 int w = rand()%(width()-x);
342 int h = rand()%(height()-y);
343 p.<a href="qpainter.html#fillRect">fillRect</a>(x,y,w,h,c);
344 }
345
346 p.<a href="qpainter.html#fillRect">fillRect</a>(0, 0, width(), height(), backgroundColor());
347
348 delete lpb;
349 }
350 }
351
352 <a href="qmenubar.html">QMenuBar</a>* menubar;
353 <a href="qprogressdialog.html">QProgressDialog</a>* pb;
354 <a href="qpopupmenu.html">QPopupMenu</a>* options;
355 int td_id, ld_id;
356 int dl_id, cl_id;
357 int md_id;
358 int rects;
359 bool timer_driven;
360 bool default_label;
361 bool got_stop;
362};
363
364int main( int argc, char **argv )
365{
366 <a href="qapplication.html">QApplication</a> a( argc, argv );
367
368 int wincount = argc &gt; 1 ? atoi(argv[1]) : 1;
369
370 for ( int i=0; i&lt;wincount; i++ ) {
371 CPUWaster* cpuw = new CPUWaster;
372 if ( i == 0 ) a.<a href="qapplication.html#setMainWidget">setMainWidget</a>(cpuw);
373 cpuw-&gt;<a href="qwidget.html#show">show</a>();
374 }
375 return a.<a href="qapplication.html#exec">exec</a>();
376}
377
378#include "progress.moc"
379</pre>
380
381<p>See also <a href="examples.html">Examples</a>.
382
383<!-- eof -->
384<p><address><hr><div align=center>
385<table width=100% cellspacing=0 border=0><tr>
386<td>Copyright &copy; 2007
387<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
388<td align=right><div align=right>Qt 3.3.8</div>
389</table></div></address></body>
390</html>
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