qt3-doc 3:3.3.8-b-8ubuntu3 / usr / share / qt3 / doc / html / tooltip-example.html

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/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"><!--
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&nbsp;Classes</font></a>
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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>

   
<p> 
This example widget demonstrates how to use tool tips for static and
dynamic regions within a widget.
<p> It displays two blue and one red rectangle.  The blue ones move every
time you click on them, the red one is static.  There are dynamic
tool 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   3.3.8   edited Jan 11 14:37 $
**
** Copyright (C) 1992-2007 Trolltech ASA.  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 &lt;<a href="qwidget-h.html">qwidget.h</a>&gt;
#include &lt;<a href="qtooltip-h.html">qtooltip.h</a>&gt;


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> &amp; );
};


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> &amp; );

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   3.3.8   edited Jan 11 14:37 $
**
** Copyright (C) 1992-2007 Trolltech ASA.  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 &lt;<a href="qapplication-h.html">qapplication.h</a>&gt;
#include &lt;<a href="qpainter-h.html">qpainter.h</a>&gt;
#include &lt;stdlib.h&gt;


<a name="f251"></a>DynamicTip::DynamicTip( <a href="qwidget.html">QWidget</a> * parent )
    : <a href="qtooltip.html">QToolTip</a>( parent )
{
    // no explicit initialization needed
}


<a name="x451"></a>void DynamicTip::<a href="qtooltip.html#maybeTip">maybeTip</a>( const <a href="qpoint.html">QPoint</a> &amp;pos )
{
    if ( !parentWidget()-&gt;inherits( "TellMe" ) )
        return;

    <a href="qrect.html">QRect</a> r( ((TellMe*)<a href="qtooltip.html#parentWidget">parentWidget</a>())-&gt;tip(pos) );
<a name="x448"></a>    if ( !r.<a href="qrect.html#isValid">isValid</a>() )
        return;

    <a href="qstring.html">QString</a> s;
<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() );
    tip( r, s );
}


<a name="f252"></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="x450"></a>    QToolTip::<a href="qtooltip.html#add">add</a>( this, r3, "this color is called red" ); // &lt;- 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="x446"></a>    if ( e-&gt;<a href="qpaintevent.html#rect">rect</a>().intersects( r1 ) ) {
<a name="x445"></a>        p.<a href="qpainter.html#setBrush">setBrush</a>( blue );
<a name="x444"></a>        p.<a href="qpainter.html#drawRect">drawRect</a>( r1 );
    }

    if ( e-&gt;<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-&gt;<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="x452"></a>void TellMe::<a href="qwidget.html#mousePressEvent">mousePressEvent</a>( <a href="qmouseevent.html">QMouseEvent</a> * e )
{
<a name="x443"></a>    if ( r1.contains( e-&gt;<a href="qmouseevent.html#pos">pos</a>() ) )
        r1 = randomRect();
    if ( r2.contains( e-&gt;<a href="qmouseevent.html#pos">pos</a>() ) )
        r2 = randomRect();
    <a href="qwidget.html#repaint">repaint</a>();
}


<a name="x454"></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="f253"></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="f254"></a>TellMe::tip( const <a href="qpoint.html">QPoint</a> &amp; 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   3.3.8   edited Jan 11 14:37 $
**
** Copyright (C) 1992-2007 Trolltech ASA.  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 &lt;<a href="qapplication-h.html">qapplication.h</a>&gt;
#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>( &amp;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>.

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