source: trunk/doc/html/tooltip-example.html@ 203

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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/tooltip/tooltip.doc:4 -->
3<html>
4<head>
5<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
6<title>Advanced use of tool tips</title>
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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>Advanced use of tool tips</h1>
33
34
35<p>
36This example widget demonstrates how to use tool tips for static and
37dynamic regions within a widget.
38<p> It displays two blue and one red rectangle. The blue ones move every
39time you click on them, the red one is static. There are dynamic
40tool tips on the blue rectangles and a static tool tip on the red one.
41<p> <hr>
42<p> Header file:
43<p> <pre>/****************************************************************************
44** $Id: tooltip-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#include &lt;<a href="qwidget-h.html">qwidget.h</a>&gt;
54#include &lt;<a href="qtooltip-h.html">qtooltip.h</a>&gt;
55
56
57class DynamicTip : public <a href="qtooltip.html">QToolTip</a>
58{
59public:
60 DynamicTip( <a href="qwidget.html">QWidget</a> * parent );
61
62protected:
63 void maybeTip( const <a href="qpoint.html">QPoint</a> &amp; );
64};
65
66
67class TellMe : public <a href="qwidget.html">QWidget</a>
68{
69 <a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
70public:
71 TellMe( <a href="qwidget.html">QWidget</a> * parent = 0, const char * name = 0 );
72 ~TellMe();
73
74 <a href="qrect.html">QRect</a> tip( const <a href="qpoint.html">QPoint</a> &amp; );
75
76protected:
77 void paintEvent( <a href="qpaintevent.html">QPaintEvent</a> * );
78 void mousePressEvent( <a href="qmouseevent.html">QMouseEvent</a> * );
79 void resizeEvent( <a href="qresizeevent.html">QResizeEvent</a> * );
80
81private:
82 <a href="qrect.html">QRect</a> randomRect();
83
84 <a href="qrect.html">QRect</a> r1, r2, r3;
85 DynamicTip * t;
86};
87</pre>
88
89<p> <hr>
90<p> Implementation:
91<p> <pre>/****************************************************************************
92** $Id: tooltip-example.html 2051 2007-02-21 10:04:20Z chehrlic $
93**
94** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
95**
96** This file is part of an example program for Qt. This example
97** program may be used, distributed and modified without limitation.
98**
99*****************************************************************************/
100
101#include "tooltip.h"
102#include &lt;<a href="qapplication-h.html">qapplication.h</a>&gt;
103#include &lt;<a href="qpainter-h.html">qpainter.h</a>&gt;
104#include &lt;stdlib.h&gt;
105
106
107<a name="f251"></a>DynamicTip::DynamicTip( <a href="qwidget.html">QWidget</a> * parent )
108 : <a href="qtooltip.html">QToolTip</a>( parent )
109{
110 // no explicit initialization needed
111}
112
113
114<a name="x451"></a>void DynamicTip::<a href="qtooltip.html#maybeTip">maybeTip</a>( const <a href="qpoint.html">QPoint</a> &amp;pos )
115{
116 if ( !parentWidget()-&gt;inherits( "TellMe" ) )
117 return;
118
119 <a href="qrect.html">QRect</a> r( ((TellMe*)<a href="qtooltip.html#parentWidget">parentWidget</a>())-&gt;tip(pos) );
120<a name="x448"></a> if ( !r.<a href="qrect.html#isValid">isValid</a>() )
121 return;
122
123 <a href="qstring.html">QString</a> s;
124<a name="x449"></a><a name="x447"></a> s.<a href="qstring.html#sprintf">sprintf</a>( "position: %d,%d", r.<a href="qrect.html#center">center</a>().x(), r.<a href="qrect.html#center">center</a>().y() );
125 tip( r, s );
126}
127
128
129<a name="f252"></a>TellMe::TellMe( <a href="qwidget.html">QWidget</a> * parent , const char * name )
130 : <a href="qwidget.html">QWidget</a>( parent, name )
131{
132 <a href="qwidget.html#setMinimumSize">setMinimumSize</a>( 30, 30 );
133 r1 = randomRect();
134 r2 = randomRect();
135 r3 = randomRect();
136
137 t = new DynamicTip( this );
138
139<a name="x450"></a> QToolTip::<a href="qtooltip.html#add">add</a>( this, r3, "this color is called red" ); // &lt;- helpful
140}
141
142
143TellMe::~TellMe()
144{
145 delete t;
146 t = 0;
147}
148
149
150void TellMe::<a href="qwidget.html#paintEvent">paintEvent</a>( <a href="qpaintevent.html">QPaintEvent</a> * e )
151{
152 <a href="qpainter.html">QPainter</a> p( this );
153
154 // I try to be efficient here, and repaint only what's needed
155
156<a name="x446"></a> if ( e-&gt;<a href="qpaintevent.html#rect">rect</a>().intersects( r1 ) ) {
157<a name="x445"></a> p.<a href="qpainter.html#setBrush">setBrush</a>( blue );
158<a name="x444"></a> p.<a href="qpainter.html#drawRect">drawRect</a>( r1 );
159 }
160
161 if ( e-&gt;<a href="qpaintevent.html#rect">rect</a>().intersects( r2 ) ) {
162 p.<a href="qpainter.html#setBrush">setBrush</a>( blue );
163 p.<a href="qpainter.html#drawRect">drawRect</a>( r2 );
164 }
165
166 if ( e-&gt;<a href="qpaintevent.html#rect">rect</a>().intersects( r3 ) ) {
167 p.<a href="qpainter.html#setBrush">setBrush</a>( red );
168 p.<a href="qpainter.html#drawRect">drawRect</a>( r3 );
169 }
170}
171
172
173<a name="x452"></a>void TellMe::<a href="qwidget.html#mousePressEvent">mousePressEvent</a>( <a href="qmouseevent.html">QMouseEvent</a> * e )
174{
175<a name="x443"></a> if ( r1.contains( e-&gt;<a href="qmouseevent.html#pos">pos</a>() ) )
176 r1 = randomRect();
177 if ( r2.contains( e-&gt;<a href="qmouseevent.html#pos">pos</a>() ) )
178 r2 = randomRect();
179 <a href="qwidget.html#repaint">repaint</a>();
180}
181
182
183<a name="x454"></a>void TellMe::<a href="qwidget.html#resizeEvent">resizeEvent</a>( <a href="qresizeevent.html">QResizeEvent</a> * )
184{
185 if ( !rect().contains( r1 ) )
186 r1 = randomRect();
187 if ( !rect().contains( r2 ) )
188 r2 = randomRect();
189}
190
191
192QRect <a name="f253"></a>TellMe::randomRect()
193{
194 return QRect( ::rand() % (<a href="qwidget.html#width">width</a>() - 20), ::rand() % (<a href="qwidget.html#height">height</a>() - 20),
195 20, 20 );
196}
197
198
199QRect <a name="f254"></a>TellMe::tip( const <a href="qpoint.html">QPoint</a> &amp; p )
200{
201 if ( r1.contains( p ) )
202 return r1;
203 else if ( r2.contains( p ) )
204 return r2;
205 else
206 return QRect( 0,0, -1,-1 );
207}
208</pre>
209
210<p> <hr>
211<p> Main:
212<p> <pre>/****************************************************************************
213** $Id: tooltip-example.html 2051 2007-02-21 10:04:20Z chehrlic $
214**
215** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
216**
217** This file is part of an example program for Qt. This example
218** program may be used, distributed and modified without limitation.
219**
220*****************************************************************************/
221
222#include &lt;<a href="qapplication-h.html">qapplication.h</a>&gt;
223#include "tooltip.h"
224
225int main( int argc, char ** argv )
226{
227 <a href="qapplication.html">QApplication</a> a( argc, argv );
228
229 TellMe mw;
230 mw.<a href="qwidget.html#setCaption">setCaption</a>( "Qt Example - Dynamic Tool Tips" );
231 a.<a href="qapplication.html#setMainWidget">setMainWidget</a>( &amp;mw );
232 mw.<a href="qwidget.html#show">show</a>();
233
234 return a.<a href="qapplication.html#exec">exec</a>();
235}
236</pre>
237
238<p>See also <a href="examples.html">Examples</a>.
239
240<!-- eof -->
241<p><address><hr><div align=center>
242<table width=100% cellspacing=0 border=0><tr>
243<td>Copyright &copy; 2007
244<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
245<td align=right><div align=right>Qt 3.3.8</div>
246</table></div></address></body>
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