# 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 1.6 1998/06/16 11:39:35 warwick Exp $
    **
    ** Copyright (C) 1992-1998 Troll Tech 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 <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 );
    }