src/pixmapviewer.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2006 by Peter Penz                                      *
   3  *   peter.penz@gmx.at                                                     *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program 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         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA          *
  19  ***************************************************************************/
  20
  21 #include "pixmapviewer.h"
  22
  23 #include <kiconloader.h>
  24 #include <QtGui/QPainter>
  25 #include <QtGui/QPixmap>
  26 #include <QtGui/QPaintEvent>
  27 #include <QtDebug>
  28
  29 PixmapViewer::PixmapViewer(QWidget* parent) :
  30     QWidget(parent),
  31     m_animationStep(0)
  32 {
  33     setMinimumWidth(K3Icon::SizeEnormous);
  34     setMinimumWidth(K3Icon::SizeEnormous);
  35
  36     m_animation.setDuration(750);
  37
  38     connect(&m_animation, SIGNAL(valueChanged(qreal)), this, SLOT(update()));
  39     connect(&m_animation, SIGNAL(finished()), this, SLOT(finishTransition()));
  40 }
  41
  42 PixmapViewer::~PixmapViewer()
  43 {
  44 }
  45
  46 void PixmapViewer::setPixmap(const QPixmap& pixmap)
  47 {
  48     if (pixmap.isNull()) {
  49         return;
  50     }
  51
  52     m_pendingPixmap = pixmap;
  53
  54     if (m_animation.state() == QTimeLine::NotRunning) {
  55         beginTransition();
  56     }
  57 }
  58
  59 void PixmapViewer::beginTransition()
  60 {
  61     Q_ASSERT(!m_pendingPixmap.isNull());
  62     Q_ASSERT(m_nextPixmap.isNull());
  63
  64     m_nextPixmap = m_pendingPixmap;
  65     m_pendingPixmap = QPixmap();
  66     m_animation.start();
  67 }
  68
  69 void PixmapViewer::finishTransition()
  70 {
  71     m_pixmap = m_nextPixmap;
  72     m_nextPixmap = QPixmap();
  73
  74     if (!m_pendingPixmap.isNull()) {
  75         beginTransition();
  76     }
  77 }
  78
  79 void PixmapViewer::paintEvent(QPaintEvent* event)
  80 {
  81     QWidget::paintEvent(event);
  82
  83     QPainter painter;
  84     painter.begin(this);
  85     const int x = (width() - m_pixmap.width()) / 2;
  86     const int y = (height() - m_pixmap.height()) / 2;
  87
  88     if (!m_nextPixmap.isNull()) {
  89         const int nextPixmapX = (width() - m_nextPixmap.width()) / 2;
  90         const int nextPixmapY = (height() - m_nextPixmap.height()) / 2;
  91
  92         painter.setOpacity( 1 - m_animation.currentValue() );
  93         painter.drawPixmap(x, y, m_pixmap);
  94         painter.setOpacity( m_animation.currentValue() );
  95         painter.drawPixmap(nextPixmapX,nextPixmapY,m_nextPixmap);
  96     } else {
  97         painter.drawPixmap(x, y, m_pixmap);
  98     }
  99
 100     painter.end();
 101 }
 102
 103 #include "pixmapviewer.moc"