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/***************************************************************************
* $Id$
**
* Copyright (C) 1992-2000 Trolltech 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.
**
****************************************************************************/
import org.kde.qt.*;
class Hello extends QWidget
{
private String t;
private int b = 0;
/*
Constructs a Hello widget. Starts a 40 ms animation timer.
*/
Hello( String text )
{
this(text, null, null);
}
Hello( String text, QWidget parent, String name )
{
super(parent,name);
t = text;
QTimer timer = new QTimer(this);
connect( timer, SIGNAL("timeout()"), SLOT("animate()") );
timer.start( 40 );
resize( 260, 130 );
}
/*
This private slot is called each time the timer fires.
*/
void animate()
{
b = (b + 1) & 15;
repaint( false );
}
/*
Handles mouse button release events for the Hello widget.
We emit the clicked() signal when the mouse is released inside
the widget.
*/
protected void mouseReleaseEvent( QMouseEvent e )
{
if ( rect().contains( e.pos() ) )
emit("clicked");
}
static int sin_tbl[] = {
0, 38, 71, 92, 100, 92, 71, 38, 0, -38, -71, -92, -100, -92, -71, -38};
/*
Handles paint events for the Hello widget.
Flicker-free update. The text is first drawn in the pixmap and the
pixmap is then blt'ed to the screen.
*/
protected void paintEvent( QPaintEvent e )
{
if ( t.equals("") )
return;
// 1: Compute some sizes, positions etc.
QFontMetrics fm = fontMetrics();
int w = fm.width(t) + 20;
int h = fm.height() * 2;
int pmx = width()/2 - w/2;
int pmy = height()/2 - h/2;
// 2: Create the pixmap and fill it with the widget's background
QPixmap pm = new QPixmap( w, h );
pm.fill( this, pmx, pmy );
// 3: Paint the pixmap. Cool wave effect
QPainter p = new QPainter();
int x = 10;
int y = h/2 + fm.descent();
int i = 0;
p.begin( pm );
p.setFont( font() );
while ( i < t.length() ) {
int i16 = (b+i) & 15;
p.setPen( new QColor((15-i16)*16,255,255,QColor.Hsv) );
p.drawText( x, y-sin_tbl[i16]*h/800, t.substring(i,i+1), 1 );
x += fm.width( t.substring(i,i+1) );
i++;
}
p.end();
// 4: Copy the pixmap to the Hello widget
bitBlt( this, pmx, pmy, pm );
}
}
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