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| Source at commit 1322 created 12 years 8 months ago. By meklort, Add doxygen to utils folder | |
|---|---|
| 1 | /****************************************************************************␊ |
| 2 | ** ␊ |
| 3 | **␊ |
| 4 | ** Copyright (C) 1992-1998 Troll Tech AS. All rights reserved.␊ |
| 5 | **␊ |
| 6 | ** This file is part of an example program for Qt. This example␊ |
| 7 | ** program may be used, distributed and modified without limitation.␊ |
| 8 | **␊ |
| 9 | *****************************************************************************/␊ |
| 10 | ␊ |
| 11 | #include "hello.h"␊ |
| 12 | #include <qpushbutton.h>␊ |
| 13 | #include <qtimer.h>␊ |
| 14 | #include <qpainter.h>␊ |
| 15 | #include <qpixmap.h>␊ |
| 16 | ␊ |
| 17 | ␊ |
| 18 | /*␊ |
| 19 | Constructs a Hello widget. Starts a 40 ms animation timer.␊ |
| 20 | */␊ |
| 21 | ␊ |
| 22 | Hello::Hello( const char *text, QWidget *parent, const char *name )␊ |
| 23 | : QWidget(parent,name), t(text), b(0)␊ |
| 24 | {␊ |
| 25 | QTimer *timer = new QTimer(this);␊ |
| 26 | connect( timer, SIGNAL(timeout()), SLOT(animate()) );␊ |
| 27 | timer->start( 40 );␊ |
| 28 | ␊ |
| 29 | resize( 200, 100 );␊ |
| 30 | }␊ |
| 31 | ␊ |
| 32 | ␊ |
| 33 | /*␊ |
| 34 | This private slot is called each time the timer fires.␊ |
| 35 | */␊ |
| 36 | ␊ |
| 37 | void Hello::animate()␊ |
| 38 | {␊ |
| 39 | b = (b + 1) & 15;␊ |
| 40 | repaint( FALSE );␊ |
| 41 | }␊ |
| 42 | ␊ |
| 43 | ␊ |
| 44 | /*␊ |
| 45 | Handles mouse button release events for the Hello widget.␊ |
| 46 | ␊ |
| 47 | We emit the clicked() signal when the mouse is released inside␊ |
| 48 | the widget.␊ |
| 49 | */␊ |
| 50 | ␊ |
| 51 | void Hello::mouseReleaseEvent( QMouseEvent *e )␊ |
| 52 | {␊ |
| 53 | if ( rect().contains( e->pos() ) )␊ |
| 54 | ␉emit clicked();␊ |
| 55 | }␊ |
| 56 | ␊ |
| 57 | ␊ |
| 58 | /*␊ |
| 59 | Handles paint events for the Hello widget.␊ |
| 60 | ␊ |
| 61 | Flicker-free update. The text is first drawn in the pixmap and the␊ |
| 62 | pixmap is then blt'ed to the screen.␊ |
| 63 | */␊ |
| 64 | ␊ |
| 65 | void Hello::paintEvent( QPaintEvent * )␊ |
| 66 | {␊ |
| 67 | static int sin_tbl[16] = {␊ |
| 68 | ␉0, 38, 71, 92, 100, 92, 71, 38,␉0, -38, -71, -92, -100, -92, -71, -38};␊ |
| 69 | ␊ |
| 70 | if ( t.isEmpty() )␊ |
| 71 | ␉return;␊ |
| 72 | ␊ |
| 73 | // 1: Compute some sizes, positions etc.␊ |
| 74 | QFontMetrics fm = fontMetrics();␊ |
| 75 | int w = fm.width(t) + 20;␊ |
| 76 | int h = fm.height() * 2;␊ |
| 77 | int pmx = width()/2 - w/2;␊ |
| 78 | int pmy = height()/2 - h/2;␊ |
| 79 | ␊ |
| 80 | // 2: Create the pixmap and fill it with the widget's background␊ |
| 81 | QPixmap pm( w, h );␊ |
| 82 | pm.fill( this, pmx, pmy );␊ |
| 83 | ␊ |
| 84 | // 3: Paint the pixmap. Cool wave effect␊ |
| 85 | QPainter p;␊ |
| 86 | int x = 10;␊ |
| 87 | int y = h/2 + fm.descent();␊ |
| 88 | int i = 0;␊ |
| 89 | p.begin( &pm );␊ |
| 90 | p.setFont( font() );␊ |
| 91 | while ( t[i] ) {␊ |
| 92 | ␉int i16 = (b+i) & 15;␊ |
| 93 | p.setPen( QColor((15-i16)*16,255,255,QColor::Hsv) );␊ |
| 94 | ␉p.drawText( x, y-sin_tbl[i16]*h/800, &t[i], 1 );␊ |
| 95 | ␉x += fm.width( t[i] );␊ |
| 96 | ␉i++;␊ |
| 97 | }␊ |
| 98 | p.end();␊ |
| 99 | ␊ |
| 100 | // 4: Copy the pixmap to the Hello widget␊ |
| 101 | bitBlt( this, pmx, pmy, &pm );␊ |
| 102 | }␊ |
| 103 | |
