src/pixmapviewer.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2006 by Peter Penz <peter.penz@gmx.at>                  *
   3  *                                                                         *
   4  *   This program is free software; you can redistribute it and/or modify  *
   5  *   it under the terms of the GNU General Public License as published by  *
   6  *   the Free Software Foundation; either version 2 of the License, or     *
   7  *   (at your option) any later version.                                   *
   8  *                                                                         *
   9  *   This program is distributed in the hope that it will be useful,       *
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  12  *   GNU General Public License for more details.                          *
  13  *                                                                         *
  14  *   You should have received a copy of the GNU General Public License     *
  15  *   along with this program; if not, write to the                         *
  16  *   Free Software Foundation, Inc.,                                       *
  17  *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA          *
  18  ***************************************************************************/
  19
  20 #include "pixmapviewer.h"
  21
  22 #include <kiconloader.h>
  23 #include <QtGui/QPainter>
  24 #include <QtGui/QPixmap>
  25 #include <QtGui/QKeyEvent>
  26
  27 PixmapViewer::PixmapViewer(QWidget* parent, Transition transition) :
  28     QWidget(parent),
  29     m_transition(transition),
  30     m_animationStep(0)
  31 {
  32     setMinimumWidth(K3Icon::SizeEnormous);
  33     setMinimumWidth(K3Icon::SizeEnormous);
  34
  35     m_animation.setDuration(300);
  36     connect(&m_animation, SIGNAL(valueChanged(qreal)), this, SLOT(update()));
  37 }
  38
  39 PixmapViewer::~PixmapViewer()
  40 {
  41 }
  42
  43 void PixmapViewer::setPixmap(const QPixmap& pixmap)
  44 {
  45     if (pixmap.isNull()) {
  46         return;
  47     }
  48
  49     m_oldPixmap = m_pixmap.isNull() ? pixmap : m_pixmap;
  50     m_pixmap = pixmap;
  51     update();
  52
  53     const bool animate = (m_transition != NoTransition) &&
  54                          (m_pixmap.size() != m_oldPixmap.size());
  55     if (animate) {
  56         m_animation.start();
  57     }
  58 }
  59
  60 void PixmapViewer::paintEvent(QPaintEvent* event)
  61 {
  62     QWidget::paintEvent(event);
  63
  64     QPainter painter(this);
  65
  66     const float value = m_animation.currentValue();
  67
  68     const int scaledWidth  = static_cast<int>((m_oldPixmap.width()  * (1.0 - value)) + (m_pixmap.width()  * value));
  69     const int scaledHeight = static_cast<int>((m_oldPixmap.height() * (1.0 - value)) + (m_pixmap.height() * value));
  70     const int x = (width()  - scaledWidth ) / 2;
  71     const int y = (height() - scaledHeight) / 2;
  72
  73     const bool useOldPixmap = (m_transition == SizeTransition) &&
  74                               (m_oldPixmap.width() > m_pixmap.width());
  75     const QPixmap& largePixmap = useOldPixmap ? m_oldPixmap : m_pixmap;
  76     const QPixmap scaledPixmap = largePixmap.scaled(scaledWidth,
  77                                                     scaledHeight,
  78                                                     Qt::IgnoreAspectRatio,
  79                                                     Qt::SmoothTransformation);
  80     painter.drawPixmap(x, y, scaledPixmap);
  81 }
  82
  83 #include "pixmapviewer.moc"