workspace/kscreensaver/libkscreensaver/kscreensaver.cpp

   1 /* This file is part of the KDE libraries
   2
   3     Copyright (c) 2001  Martin R. Jones <mjones@kde.org>
   4
   5     This library is free software; you can redistribute it and/or
   6     modify it under the terms of the GNU Library General Public
   7     License as published by the Free Software Foundation; either
   8     version 2 of the License, or (at your option) any later version.
   9
  10     This library is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13     Library General Public License for more details.
  14
  15     You should have received a copy of the GNU Library General Public License
  16     along with this library; see the file COPYING.LIB.  If not, write to
  17     the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  18     Boston, MA 02110-1301, USA.
  19 */
  20
  21 #include "kscreensaver.h"
  22
  23 #include <QPainter>
  24 #include <QTimer>
  25 #include <QtGui/QX11Info>
  26 #include <QApplication>
  27 #include <krandom.h>
  28
  29 #ifdef Q_WS_X11
  30 #include <X11/Xlib.h>
  31 #endif
  32
  33 //-----------------------------------------------------------------------------
  34
  35 KScreenSaver::KScreenSaver( WId id ) : QWidget()
  36 {
  37     if ( id )
  38     {
  39         create( id, false, true );
  40     }
  41 }
  42
  43 KScreenSaver::~KScreenSaver()
  44 {
  45     destroy( false, false );
  46 }
  47
  48 void KScreenSaver::embed( QWidget *w )
  49 {
  50     QApplication::sendPostedEvents();
  51 #ifdef Q_WS_X11 //FIXME
  52     XReparentWindow(QX11Info::display(), w->winId(), winId(), 0, 0);
  53 #endif
  54     w->setGeometry( 0, 0, width(), height() );
  55     QApplication::sendPostedEvents();
  56 }
  57
  58 KScreenSaverInterface::~KScreenSaverInterface()
  59 {
  60 }
  61
  62 QDialog* KScreenSaverInterface::setup()
  63 {
  64     return 0;
  65 }
  66
  67 //============================================================================
  68
  69 class KBlankEffectPrivate
  70 {
  71 public:
  72     KBlankEffect::BlankEffect currentEffect;
  73     int effectProgress;
  74     QTimer *timer;
  75     QWidget *widget;
  76 };
  77
  78 KBlankEffect::BlankEffect KBlankEffect::effects[] = {
  79     &KBlankEffect::blankNormal,
  80     &KBlankEffect::blankSweepRight,
  81     &KBlankEffect::blankSweepDown,
  82     &KBlankEffect::blankBlocks
  83 };
  84
  85 KBlankEffect::KBlankEffect( QObject *parent ) : QObject( parent )
  86 {
  87     d = new KBlankEffectPrivate;
  88     d->currentEffect = &KBlankEffect::blankNormal;
  89     d->effectProgress = 0;
  90     d->timer = new QTimer( this );
  91     connect( d->timer, SIGNAL(timeout()), this, SLOT(timeout()) );
  92 }
  93
  94
  95 KBlankEffect::~KBlankEffect()
  96 {
  97     delete d;
  98 }
  99
 100 void KBlankEffect::finished()
 101 {
 102     d->timer->stop();
 103     d->effectProgress = 0;
 104     emit doneBlank();
 105 }
 106
 107
 108 void KBlankEffect::blank( QWidget *w, Effect effect )
 109 {
 110     if ( !w ) {
 111         emit doneBlank();
 112         return;
 113     }
 114
 115     if ( effect == Random )
 116         effect = (Effect)(KRandom::random() % MaximumEffects);
 117
 118     d->effectProgress = 0;
 119     d->widget = w;
 120     d->currentEffect = effects[ (int)effect ];
 121     d->timer->start( 10 );
 122 }
 123
 124 void KBlankEffect::timeout()
 125 {
 126     (this->*d->currentEffect)();
 127 }
 128
 129 void KBlankEffect::blankNormal()
 130 {
 131     QPainter p( d->widget );
 132     p.fillRect( 0, 0, d->widget->width(), d->widget->height(), Qt::black );
 133     finished();
 134 }
 135
 136
 137 void KBlankEffect::blankSweepRight()
 138 {
 139     QPainter p( d->widget );
 140     p.fillRect( d->effectProgress, 0, 50, d->widget->height(), Qt::black );
 141     qApp->flush();
 142     d->effectProgress += 50;
 143     if ( d->effectProgress >= d->widget->width() )
 144         finished();
 145 }
 146
 147
 148 void KBlankEffect::blankSweepDown()
 149 {
 150     QPainter p( d->widget );
 151     p.fillRect( 0, d->effectProgress, d->widget->width(), 50, Qt::black );
 152     qApp->flush();
 153     d->effectProgress += 50;
 154     if ( d->effectProgress >= d->widget->height() )
 155         finished();
 156 }
 157
 158
 159 void KBlankEffect::blankBlocks()
 160 {
 161     static int *block = 0;
 162
 163     int bx = (d->widget->width()+63)/64;
 164     int by = (d->widget->height()+63)/64;
 165
 166     if ( !d->effectProgress ) {
 167         block = new int [ bx*by ];
 168
 169         for ( int i = 0; i < bx*by; i++ )
 170             block[i] = i;
 171         for ( int i = 0; i < bx*by; i++ ) {
 172             int swap = KRandom::random()%(bx*by);
 173             int tmp = block[i];
 174             block[i] = block[swap];
 175             block[swap] = tmp;
 176         }
 177     }
 178
 179     QPainter p( d->widget );
 180
 181     // erase a couple of blocks at a time, otherwise it looks too slow
 182     for ( int i = 0; i < 2 && d->effectProgress < bx*by; i++ ) {
 183         int x = block[d->effectProgress]%bx;
 184         int y = block[d->effectProgress]/bx;
 185         p.fillRect( x*64, y*64, 64, 64, Qt::black );
 186         d->effectProgress++;
 187     }
 188
 189     qApp->flush();
 190
 191     if ( d->effectProgress >= bx*by ) {
 192         delete[] block;
 193         finished();
 194     }
 195 }
 196
 197 #include "kscreensaver.moc"