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117 lines
2.2 KiB
117 lines
2.2 KiB
14 years ago
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/****************************************************************************
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**
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** Copyright (C) 1992-2008 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 <qapplication.h>
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#include <qpainter.h>
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#include <stdlib.h>
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DynamicTip::DynamicTip( QWidget * parent )
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: QToolTip( parent )
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{
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// no explicit initialization needed
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}
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void DynamicTip::maybeTip( const QPoint &pos )
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{
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if ( !parentWidget()->inherits( "TellMe" ) )
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return;
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QRect r( ((TellMe*)parentWidget())->tip(pos) );
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if ( !r.isValid() )
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return;
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QString s;
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s.sprintf( "position: %d,%d", r.center().x(), r.center().y() );
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tip( r, s );
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}
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TellMe::TellMe( QWidget * parent , const char * name )
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: QWidget( parent, name )
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{
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setMinimumSize( 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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QToolTip::add( 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::paintEvent( QPaintEvent * e )
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{
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QPainter p( this );
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// I try to be efficient here, and repaint only what's needed
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if ( e->rect().intersects( r1 ) ) {
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p.setBrush( blue );
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p.drawRect( r1 );
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}
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if ( e->rect().intersects( r2 ) ) {
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p.setBrush( blue );
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p.drawRect( r2 );
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}
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if ( e->rect().intersects( r3 ) ) {
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p.setBrush( red );
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p.drawRect( r3 );
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}
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}
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void TellMe::mousePressEvent( QMouseEvent * e )
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{
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if ( r1.contains( e->pos() ) )
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r1 = randomRect();
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if ( r2.contains( e->pos() ) )
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r2 = randomRect();
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repaint();
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}
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void TellMe::resizeEvent( QResizeEvent * )
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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 TellMe::randomRect()
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{
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return QRect( ::rand() % (width() - 20), ::rand() % (height() - 20),
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20, 20 );
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}
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QRect TellMe::tip( const QPoint & 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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