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248 lines
8.2 KiB
248 lines
8.2 KiB
14 years ago
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/examples/tooltip/tooltip.doc:4 -->
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>Advanced use of tool tips</title>
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<style type="text/css"><!--
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fn { margin-left: 1cm; text-indent: -1cm; }
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a:link { color: #004faf; text-decoration: none }
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a:visited { color: #672967; text-decoration: none }
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body { background: #ffffff; color: black; }
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--></style>
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</head>
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<body>
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<table border="0" cellpadding="0" cellspacing="0" width="100%">
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<tr bgcolor="#E5E5E5">
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<td valign=center>
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<a href="index.html">
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<font color="#004faf">Home</font></a>
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| <a href="classes.html">
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<font color="#004faf">All Classes</font></a>
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| <a href="mainclasses.html">
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<font color="#004faf">Main Classes</font></a>
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| <a href="annotated.html">
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<font color="#004faf">Annotated</font></a>
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| <a href="groups.html">
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<font color="#004faf">Grouped Classes</font></a>
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| <a href="functions.html">
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<font color="#004faf">Functions</font></a>
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</td>
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<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>
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<p>
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This example widget demonstrates how to use tool tips for static and
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dynamic regions within a widget.
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<p> It displays two blue and one red rectangle. The blue ones move every
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time you click on them, the red one is static. There are dynamic
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tool tips on the blue rectangles and a static tool tip on the red one.
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<p> <hr>
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<p> Header file:
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<p> <pre>/****************************************************************************
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** $Id: qt/tooltip.h 3.3.8 edited Jan 11 14:37 $
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**
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** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
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**
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** This file is part of an example program for Qt. This example
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** program may be used, distributed and modified without limitation.
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**
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*****************************************************************************/
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#include <<a href="qwidget-h.html">qwidget.h</a>>
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#include <<a href="qtooltip-h.html">qtooltip.h</a>>
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class DynamicTip : public <a href="qtooltip.html">QToolTip</a>
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{
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public:
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DynamicTip( <a href="qwidget.html">QWidget</a> * parent );
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protected:
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void maybeTip( const <a href="qpoint.html">QPoint</a> & );
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};
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class TellMe : public <a href="qwidget.html">QWidget</a>
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{
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<a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
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public:
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TellMe( <a href="qwidget.html">QWidget</a> * parent = 0, const char * name = 0 );
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~TellMe();
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<a href="qrect.html">QRect</a> tip( const <a href="qpoint.html">QPoint</a> & );
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protected:
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void paintEvent( <a href="qpaintevent.html">QPaintEvent</a> * );
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void mousePressEvent( <a href="qmouseevent.html">QMouseEvent</a> * );
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void resizeEvent( <a href="qresizeevent.html">QResizeEvent</a> * );
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private:
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<a href="qrect.html">QRect</a> randomRect();
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<a href="qrect.html">QRect</a> r1, r2, r3;
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DynamicTip * t;
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};
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</pre>
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<p> <hr>
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<p> Implementation:
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<p> <pre>/****************************************************************************
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** $Id: qt/tooltip.cpp 3.3.8 edited Jan 11 14:37 $
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**
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** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
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**
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** This file is part of an example program for Qt. This example
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** program may be used, distributed and modified without limitation.
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**
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*****************************************************************************/
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#include "tooltip.h"
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#include <<a href="qapplication-h.html">qapplication.h</a>>
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#include <<a href="qpainter-h.html">qpainter.h</a>>
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#include <stdlib.h>
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<a name="f251"></a>DynamicTip::DynamicTip( <a href="qwidget.html">QWidget</a> * parent )
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: <a href="qtooltip.html">QToolTip</a>( parent )
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{
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// no explicit initialization needed
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}
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<a name="x451"></a>void DynamicTip::<a href="qtooltip.html#maybeTip">maybeTip</a>( const <a href="qpoint.html">QPoint</a> &pos )
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{
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if ( !parentWidget()->inherits( "TellMe" ) )
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return;
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<a href="qrect.html">QRect</a> r( ((TellMe*)<a href="qtooltip.html#parentWidget">parentWidget</a>())->tip(pos) );
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<a name="x448"></a> if ( !r.<a href="qrect.html#isValid">isValid</a>() )
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return;
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<a href="qstring.html">QString</a> s;
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<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() );
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tip( r, s );
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}
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<a name="f252"></a>TellMe::TellMe( <a href="qwidget.html">QWidget</a> * parent , const char * name )
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: <a href="qwidget.html">QWidget</a>( parent, name )
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{
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<a href="qwidget.html#setMinimumSize">setMinimumSize</a>( 30, 30 );
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r1 = randomRect();
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r2 = randomRect();
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r3 = randomRect();
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t = new DynamicTip( this );
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<a name="x450"></a> QToolTip::<a href="qtooltip.html#add">add</a>( this, r3, "this color is called red" ); // <- helpful
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}
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TellMe::~TellMe()
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{
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delete t;
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t = 0;
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}
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void TellMe::<a href="qwidget.html#paintEvent">paintEvent</a>( <a href="qpaintevent.html">QPaintEvent</a> * e )
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{
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<a href="qpainter.html">QPainter</a> p( this );
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// I try to be efficient here, and repaint only what's needed
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<a name="x446"></a> if ( e-><a href="qpaintevent.html#rect">rect</a>().intersects( r1 ) ) {
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<a name="x445"></a> p.<a href="qpainter.html#setBrush">setBrush</a>( blue );
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<a name="x444"></a> p.<a href="qpainter.html#drawRect">drawRect</a>( r1 );
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}
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if ( e-><a href="qpaintevent.html#rect">rect</a>().intersects( r2 ) ) {
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p.<a href="qpainter.html#setBrush">setBrush</a>( blue );
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p.<a href="qpainter.html#drawRect">drawRect</a>( r2 );
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}
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if ( e-><a href="qpaintevent.html#rect">rect</a>().intersects( r3 ) ) {
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p.<a href="qpainter.html#setBrush">setBrush</a>( red );
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p.<a href="qpainter.html#drawRect">drawRect</a>( r3 );
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}
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}
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<a name="x452"></a>void TellMe::<a href="qwidget.html#mousePressEvent">mousePressEvent</a>( <a href="qmouseevent.html">QMouseEvent</a> * e )
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{
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<a name="x443"></a> if ( r1.contains( e-><a href="qmouseevent.html#pos">pos</a>() ) )
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r1 = randomRect();
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if ( r2.contains( e-><a href="qmouseevent.html#pos">pos</a>() ) )
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r2 = randomRect();
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<a href="qwidget.html#repaint">repaint</a>();
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}
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<a name="x454"></a>void TellMe::<a href="qwidget.html#resizeEvent">resizeEvent</a>( <a href="qresizeevent.html">QResizeEvent</a> * )
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{
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if ( !rect().contains( r1 ) )
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r1 = randomRect();
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if ( !rect().contains( r2 ) )
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r2 = randomRect();
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}
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QRect <a name="f253"></a>TellMe::randomRect()
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{
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return QRect( ::rand() % (<a href="qwidget.html#width">width</a>() - 20), ::rand() % (<a href="qwidget.html#height">height</a>() - 20),
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20, 20 );
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}
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QRect <a name="f254"></a>TellMe::tip( const <a href="qpoint.html">QPoint</a> & p )
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{
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if ( r1.contains( p ) )
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return r1;
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else if ( r2.contains( p ) )
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return r2;
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else
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return QRect( 0,0, -1,-1 );
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}
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</pre>
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<p> <hr>
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<p> Main:
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<p> <pre>/****************************************************************************
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** $Id: qt/main.cpp 3.3.8 edited Jan 11 14:37 $
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**
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** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
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**
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** This file is part of an example program for Qt. This example
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** program may be used, distributed and modified without limitation.
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**
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*****************************************************************************/
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#include <<a href="qapplication-h.html">qapplication.h</a>>
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#include "tooltip.h"
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int main( int argc, char ** argv )
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{
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<a href="qapplication.html">QApplication</a> a( argc, argv );
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TellMe mw;
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mw.<a href="qwidget.html#setCaption">setCaption</a>( "Qt Example - Dynamic Tool Tips" );
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a.<a href="qapplication.html#setMainWidget">setMainWidget</a>( &mw );
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mw.<a href="qwidget.html#show">show</a>();
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return a.<a href="qapplication.html#exec">exec</a>();
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}
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</pre>
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<p>See also <a href="examples.html">Examples</a>.
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<!-- eof -->
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<p><address><hr><div align=center>
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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||
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>Qt 3.3.8</div>
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</table></div></address></body>
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</html>
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