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authormueller <mueller@afe2bf4a-e733-0410-8a33-86f594647bc7>1999-12-15 19:25:10 (GMT)
committermueller <mueller@afe2bf4a-e733-0410-8a33-86f594647bc7>1999-12-15 19:25:10 (GMT)
commit719f0a35063be88eddcc4ed8fe7a940de47ef20c (patch)
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diff --git a/tmake/example/hello.cpp b/tmake/example/hello.cpp
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+/****************************************************************************
+** $Id$
+**
+** 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 "hello.h"
+#include <qpushbutton.h>
+#include <qtimer.h>
+#include <qpainter.h>
+#include <qpixmap.h>
+
+
+/*
+ Constructs a Hello widget. Starts a 40 ms animation timer.
+*/
+
+Hello::Hello( const char *text, QWidget *parent, const char *name )
+ : QWidget(parent,name), t(text), b(0)
+{
+ QTimer *timer = new QTimer(this);
+ connect( timer, SIGNAL(timeout()), SLOT(animate()) );
+ timer->start( 40 );
+
+ resize( 200, 100 );
+}
+
+
+/*
+ This private slot is called each time the timer fires.
+*/
+
+void Hello::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.
+*/
+
+void Hello::mouseReleaseEvent( QMouseEvent *e )
+{
+ if ( rect().contains( e->pos() ) )
+ emit clicked();
+}
+
+
+/*
+ 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.
+*/
+
+void Hello::paintEvent( QPaintEvent * )
+{
+ static int sin_tbl[16] = {
+ 0, 38, 71, 92, 100, 92, 71, 38, 0, -38, -71, -92, -100, -92, -71, -38};
+
+ if ( t.isEmpty() )
+ 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( w, h );
+ pm.fill( this, pmx, pmy );
+
+ // 3: Paint the pixmap. Cool wave effect
+ QPainter p;
+ int x = 10;
+ int y = h/2 + fm.descent();
+ int i = 0;
+ p.begin( &pm );
+ p.setFont( font() );
+ while ( t[i] ) {
+ int i16 = (b+i) & 15;
+ p.setPen( QColor((15-i16)*16,255,255,QColor::Hsv) );
+ p.drawText( x, y-sin_tbl[i16]*h/800, &t[i], 1 );
+ x += fm.width( t[i] );
+ i++;
+ }
+ p.end();
+
+ // 4: Copy the pixmap to the Hello widget
+ bitBlt( this, pmx, pmy, &pm );
+}