tooltip-example.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><!-- /home/reggie/tmp/qt-3.0-reggie-5401/qt-x11-commercial-3.0.5/examples/tooltip/tooltip.doc:4 --><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Advanced use of tool tips</title><style type="text/css"><!--h3.fn,span.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>Advanced use of tool tips</h1> <p> This example widget demonstrates how to use tool tips for static anddynamic regions within a widget.<p> It displays two blue and one red rectangle. The blue ones move everytime you click on them, the red one is static. There are dynamictool tips on the blue rectangles and a static tool tip on the red one.<p> <hr><p> Header file:<p> <pre>/****************************************************************************** $Id: qt/tooltip.h 3.0.5 edited Oct 12 2001 $**** Copyright (C) 1992-2000 Trolltech AS. 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="qwidget-h.html">qwidget.h</a>>#include <<a href="qtooltip-h.html">qtooltip.h</a>>class DynamicTip : public <a href="qtooltip.html">QToolTip</a>{public: DynamicTip( <a href="qwidget.html">QWidget</a> * parent );protected: void maybeTip( const <a href="qpoint.html">QPoint</a> & );};class TellMe : public <a href="qwidget.html">QWidget</a>{ <a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>public: TellMe( <a href="qwidget.html">QWidget</a> * parent = 0, const char * name = 0 ); ~TellMe(); <a href="qrect.html">QRect</a> tip( const <a href="qpoint.html">QPoint</a> & );protected: void paintEvent( <a href="qpaintevent.html">QPaintEvent</a> * ); void mousePressEvent( <a href="qmouseevent.html">QMouseEvent</a> * ); void resizeEvent( <a href="qresizeevent.html">QResizeEvent</a> * );private: <a href="qrect.html">QRect</a> randomRect(); <a href="qrect.html">QRect</a> r1, r2, r3; DynamicTip * t;};</pre><p> <hr><p> Implementation:<p> <pre>/****************************************************************************** $Id: qt/tooltip.cpp 3.0.5 edited Oct 12 2001 $**** Copyright (C) 1992-2000 Trolltech AS. 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 "tooltip.h"#include <<a href="qapplication-h.html">qapplication.h</a>>#include <<a href="qpainter-h.html">qpainter.h</a>>#include <stdlib.h><a name="f246"></a>DynamicTip::DynamicTip( <a href="qwidget.html">QWidget</a> * parent ) : <a href="qtooltip.html">QToolTip</a>( parent ){ // no explicit initialization needed}<a name="x570"></a>void DynamicTip::<a href="qtooltip.html#maybeTip">maybeTip</a>( const <a href="qpoint.html">QPoint</a> &pos ){ if ( !parentWidget()->inherits( "TellMe" ) ) return; <a href="qrect.html">QRect</a> r( ((TellMe*)<a href="qtooltip.html#parentWidget">parentWidget</a>())->tip(pos) );<a name="x567"></a> if ( !r.<a href="qrect.html#isValid">isValid</a>() ) return; <a href="qstring.html">QString</a> s;<a name="x568"></a><a name="x566"></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() ); tip( r, s );}<a name="f247"></a>TellMe::TellMe( <a href="qwidget.html">QWidget</a> * parent , const char * name ) : <a href="qwidget.html">QWidget</a>( parent, name ){ <a href="qwidget.html#setMinimumSize">setMinimumSize</a>( 30, 30 ); r1 = randomRect(); r2 = randomRect(); r3 = randomRect(); t = new DynamicTip( this );<a name="x569"></a> QToolTip::<a href="qtooltip.html#add">add</a>( this, r3, "this color is called red" ); // <- helpful}TellMe::~TellMe(){ delete t; t = 0;}void TellMe::<a href="qwidget.html#paintEvent">paintEvent</a>( <a href="qpaintevent.html">QPaintEvent</a> * e ){ <a href="qpainter.html">QPainter</a> p( this ); // I try to be efficient here, and repaint only what's needed<a name="x565"></a> if ( e-><a href="qpaintevent.html#rect">rect</a>().intersects( r1 ) ) {<a name="x564"></a> p.<a href="qpainter.html#setBrush">setBrush</a>( blue );<a name="x563"></a> p.<a href="qpainter.html#drawRect">drawRect</a>( r1 ); } if ( e-><a href="qpaintevent.html#rect">rect</a>().intersects( r2 ) ) { p.<a href="qpainter.html#setBrush">setBrush</a>( blue ); p.<a href="qpainter.html#drawRect">drawRect</a>( r2 ); } if ( e-><a href="qpaintevent.html#rect">rect</a>().intersects( r3 ) ) { p.<a href="qpainter.html#setBrush">setBrush</a>( red ); p.<a href="qpainter.html#drawRect">drawRect</a>( r3 ); }}<a name="x571"></a>void TellMe::<a href="qwidget.html#mousePressEvent">mousePressEvent</a>( <a href="qmouseevent.html">QMouseEvent</a> * e ){<a name="x562"></a> if ( r1.contains( e-><a href="qmouseevent.html#pos">pos</a>() ) ) r1 = randomRect(); if ( r2.contains( e-><a href="qmouseevent.html#pos">pos</a>() ) ) r2 = randomRect(); <a href="qwidget.html#repaint">repaint</a>();}<a name="x573"></a>void TellMe::<a href="qwidget.html#resizeEvent">resizeEvent</a>( <a href="qresizeevent.html">QResizeEvent</a> * ){ if ( !rect().contains( r1 ) ) r1 = randomRect(); if ( !rect().contains( r2 ) ) r2 = randomRect();}QRect <a name="f248"></a>TellMe::randomRect(){ return QRect( ::rand() % (<a href="qwidget.html#width">width</a>() - 20), ::rand() % (<a href="qwidget.html#height">height</a>() - 20), 20, 20 );}QRect <a name="f249"></a>TellMe::tip( const <a href="qpoint.html">QPoint</a> & p ){ if ( r1.contains( p ) ) return r1; else if ( r2.contains( p ) ) return r2; else return QRect( 0,0, -1,-1 );}</pre><p> <hr><p> Main:<p> <pre>/****************************************************************************** $Id: qt/main.cpp 3.0.5 edited Oct 12 2001 $**** Copyright (C) 1992-2000 Trolltech AS. 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 "tooltip.h"int main( int argc, char ** argv ){ <a href="qapplication.html">QApplication</a> a( argc, argv ); TellMe mw; mw.<a href="qwidget.html#setCaption">setCaption</a>( "Qt Example - Dynamic Tool Tips" ); a.<a href="qapplication.html#setMainWidget">setMainWidget</a>( &mw ); mw.<a href="qwidget.html#show">show</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 © 2002 <a href="http://www.trolltech.com">Trolltech</a><td><a href="http://www.trolltech.com/trademarks.html">Trademarks</a><td align=right><div align=right>Qt version 3.0.5</div></table></div></address></body></html>⌨️ 快捷键说明
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