The example program on this page may be used, distributed and modified
without limitation.
Advanced use of tool tips
This example widget demonstrates how to use tool tips for static and
dynamic regions within a widget.
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.
//
// $Id: tooltip.cpp,v 1.3 1997/03/26 18:25:57 hanord Exp $
//
// A widget to demonstrate tool tips
//
#include "tooltip.h"
#include <qapp.h>
#include <qpainter.h>
#include <stdlib.h>
DynamicTip::DynamicTip( QWidget * parent )
: QToolTip( parent )
{
// no explicit initialization needed
}
void DynamicTip::maybeTip( const QPoint &pos )
{
if ( !parentWidget()->inherits( "TellMe" ) )
return;
QRect r( ((TellMe*)parentWidget())->tip(pos) );
if ( !r.isValid() )
return;
QString s;
s.sprintf( "position: %d,%d", r.center().x(), r.center().y() );
tip( r, s );
}
TellMe::TellMe( QWidget * parent , const char * name )
: QWidget( parent, name )
{
setMinimumSize( 30, 30 );
r1 = randomRect();
r2 = randomRect();
r3 = randomRect();
t = new DynamicTip( this );
QToolTip::add( this, r3, "this color is called red" ); // <- helpful
}
TellMe::~TellMe()
{
delete t;
t = 0;
}
void TellMe::paintEvent( QPaintEvent * e )
{
QPainter p( this );
// I try to be efficient here, and repaint only what's needed
if ( e->rect().intersects( r1 ) ) {
p.setBrush( blue );
p.drawRect( r1 );
}
if ( e->rect().intersects( r2 ) ) {
p.setBrush( blue );
p.drawRect( r2 );
}
if ( e->rect().intersects( r3 ) ) {
p.setBrush( red );
p.drawRect( r3 );
}
}
void TellMe::mousePressEvent( QMouseEvent * e )
{
if ( r1.contains( e->pos() ) )
r1 = randomRect();
if ( r2.contains( e->pos() ) )
r2 = randomRect();
repaint();
}
void TellMe::resizeEvent( QResizeEvent * )
{
if ( !rect().contains( r1 ) )
r1 = randomRect();
if ( !rect().contains( r2 ) )
r2 = randomRect();
}
QRect TellMe::randomRect()
{
return QRect( ::rand() % (width() - 20), ::rand() % (height() - 20),
20, 20 );
}
QRect TellMe::tip( const QPoint & p )
{
if ( r1.contains( p ) )
return r1;
else if ( r2.contains( p ) )
return r2;
else
return QRect( 0,0, -1,-1 );
}
Generated at 23:50, 1998/03/16 for Qt version 1.33 by the webmaster at Troll Tech