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102 lines
2.3 KiB
102 lines
2.3 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 "hello.h"
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#include <qpushbutton.h>
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#include <qtimer.h>
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#include <qpainter.h>
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#include <qpixmap.h>
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/*
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Constructs a Hello widget. Starts a 40 ms animation timer.
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*/
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Hello::Hello( const char *text, QWidget *parent, const char *name )
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: QWidget(parent,name), t(text), b(0)
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{
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QTimer *timer = new QTimer(this);
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connect( timer, SIGNAL(timeout()), SLOT(animate()) );
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timer->start( 40 );
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resize( 260, 130 );
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}
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/*
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This private slot is called each time the timer fires.
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*/
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void Hello::animate()
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{
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b = (b + 1) & 15;
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repaint( FALSE );
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}
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/*
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Handles mouse button release events for the Hello widget.
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We emit the clicked() signal when the mouse is released inside
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the widget.
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*/
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void Hello::mouseReleaseEvent( QMouseEvent *e )
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{
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if ( rect().contains( e->pos() ) )
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emit clicked();
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}
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/*
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Handles paint events for the Hello widget.
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Flicker-free update. The text is first drawn in the pixmap and the
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pixmap is then blt'ed to the screen.
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*/
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void Hello::paintEvent( QPaintEvent * )
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{
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static int sin_tbl[16] = {
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0, 38, 71, 92, 100, 92, 71, 38, 0, -38, -71, -92, -100, -92, -71, -38};
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if ( t.isEmpty() )
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return;
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// 1: Compute some sizes, positions etc.
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QFontMetrics fm = fontMetrics();
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int w = fm.width(t) + 20;
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int h = fm.height() * 2;
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int pmx = width()/2 - w/2;
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int pmy = height()/2 - h/2;
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// 2: Create the pixmap and fill it with the widget's background
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QPixmap pm( w, h );
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pm.fill( this, pmx, pmy );
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// 3: Paint the pixmap. Cool wave effect
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QPainter p;
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int x = 10;
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int y = h/2 + fm.descent();
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int i = 0;
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p.begin( &pm );
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p.setFont( font() );
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while ( !t[i].isNull() ) {
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int i16 = (b+i) & 15;
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p.setPen( QColor((15-i16)*16,255,255,QColor::Hsv) );
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p.drawText( x, y-sin_tbl[i16]*h/800, t.mid(i,1), 1 );
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x += fm.width( t[i] );
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i++;
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}
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p.end();
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// 4: Copy the pixmap to the Hello widget
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bitBlt( this, pmx, pmy, &pm );
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}
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