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/****************************************************************************
**
** Copyright (C) 1992-2008 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 <qapplication.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 );
}
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