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108 lines
2.4 KiB
108 lines
2.4 KiB
/***************************************************************************
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* $Id$
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**
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* Copyright (C) 1992-2000 Trolltech AS. 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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import org.trinitydesktop.qt.*;
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class Hello extends TQWidget
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{
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private String t;
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private int b = 0;
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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( String text )
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{
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this(text, null, null);
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}
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Hello( String text, TQWidget parent, String name )
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{
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super(parent,name);
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t = text;
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TQTimer timer = new TQTimer(this);
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connect( timer, TQ_SIGNAL("timeout()"), TQ_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 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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protected void mouseReleaseEvent( TQMouseEvent 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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static int sin_tbl[] = {
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0, 38, 71, 92, 100, 92, 71, 38, 0, -38, -71, -92, -100, -92, -71, -38};
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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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protected void paintEvent( TQPaintEvent e )
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{
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if ( t.equals("") )
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return;
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// 1: Compute some sizes, positions etc.
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TQFontMetrics 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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TQPixmap pm = new TQPixmap( 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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TQPainter p = new TQPainter();
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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 ( i < t.length() ) {
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int i16 = (b+i) & 15;
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p.setPen( new TQColor((15-i16)*16,255,255,TQColor.Hsv) );
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p.drawText( x, y-sin_tbl[i16]*h/800, t.substring(i,i+1), 1 );
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x += fm.width( t.substring(i,i+1) );
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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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}
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