resize the pixmap in a smooth way instead of using a blending effect

svn path=/trunk/KDE/kdebase/apps/; revision=654753

diff --git a/src/pixmapviewer.cpp b/src/pixmapviewer.cpp
index 351f6463fafa7824d69557d293662a9f4096c03c..36d583c1d059ddd2241e573a7c1ba4f06d1a615b 100644 (file)
--- a/src/pixmapviewer.cpp
+++ b/src/pixmapviewer.cpp
@@ -24,7 +24,6 @@
 #include <QtGui/QPainter>
 #include <QtGui/QPixmap>
 #include <QtGui/QPaintEvent>
-#include <QtDebug>
 
 PixmapViewer::PixmapViewer(QWidget* parent) :
     QWidget(parent),
@@ -33,10 +32,8 @@ PixmapViewer::PixmapViewer(QWidget* parent) :
     setMinimumWidth(K3Icon::SizeEnormous);
     setMinimumWidth(K3Icon::SizeEnormous);
 
-    m_animation.setDuration(750);
-
+    m_animation.setDuration(300);
     connect(&m_animation, SIGNAL(valueChanged(qreal)), this, SLOT(update()));
-    connect(&m_animation, SIGNAL(finished()), this, SLOT(finishTransition()));
 }
 
 PixmapViewer::~PixmapViewer()
@@ -49,55 +46,30 @@ void PixmapViewer::setPixmap(const QPixmap& pixmap)
         return;
     }
 
-    m_pendingPixmap = pixmap;
-
-    if (m_animation.state() == QTimeLine::NotRunning) {
-        beginTransition();
-    }
-}
+    m_oldPixmap = m_pixmap.isNull() ? pixmap : m_pixmap;
+    m_pixmap = pixmap;
 
-void PixmapViewer::beginTransition()
-{
-    Q_ASSERT(!m_pendingPixmap.isNull());
-    Q_ASSERT(m_nextPixmap.isNull());
-
-    m_nextPixmap = m_pendingPixmap;
-    m_pendingPixmap = QPixmap();
     m_animation.start();
 }
 
-void PixmapViewer::finishTransition()
-{
-    m_pixmap = m_nextPixmap;
-    m_nextPixmap = QPixmap();
-
-    if (!m_pendingPixmap.isNull()) {
-        beginTransition();
-    }
-}
-
 void PixmapViewer::paintEvent(QPaintEvent* event)
 {
     QWidget::paintEvent(event);
 
-    QPainter painter;
-    painter.begin(this);
-    const int x = (width() - m_pixmap.width()) / 2;
-    const int y = (height() - m_pixmap.height()) / 2;
+    QPainter painter(this);
+
+    const float value = m_animation.currentValue();
 
-    if (!m_nextPixmap.isNull()) {
-        const int nextPixmapX = (width() - m_nextPixmap.width()) / 2;
-        const int nextPixmapY = (height() - m_nextPixmap.height()) / 2;
+    const int scaledWidth  = static_cast<int>((m_oldPixmap.width()  * (1.0 - value)) + (m_pixmap.width()  * value));
+    const int scaledHeight = static_cast<int>((m_oldPixmap.height() * (1.0 - value)) + (m_pixmap.height() * value));
+    const int x = (width()  - scaledWidth ) / 2;
+    const int y = (height() - scaledHeight) / 2;
 
-        painter.setOpacity( 1 - m_animation.currentValue() );
-        painter.drawPixmap(x, y, m_pixmap);
-        painter.setOpacity( m_animation.currentValue() );
-        painter.drawPixmap(nextPixmapX,nextPixmapY,m_nextPixmap);
+    if (m_oldPixmap.width() > m_pixmap.width()) {
+        painter.drawPixmap(x, y, m_oldPixmap.scaled(scaledWidth, scaledHeight));
     } else {
-        painter.drawPixmap(x, y, m_pixmap);
+        painter.drawPixmap(x, y, m_pixmap.scaled(scaledWidth, scaledHeight));
     }
-
-    painter.end();
 }
 
 #include "pixmapviewer.moc"

diff --git a/src/pixmapviewer.h b/src/pixmapviewer.h
index a5293c88d6909f7004e9e080078b39d3b474eb72..54ed5232c8e56933ef0fe1452f8c71772d4084dc 100644 (file)
--- a/src/pixmapviewer.h
+++ b/src/pixmapviewer.h
@@ -48,14 +48,9 @@ public:
 protected:
     virtual void paintEvent(QPaintEvent* event);
 
-private slots:
-    void beginTransition();
-    void finishTransition();
-
 private:
     QPixmap m_pixmap;
-    QPixmap m_nextPixmap;
-    QPixmap m_pendingPixmap;
+    QPixmap m_oldPixmap;
     QTimeLine m_animation;
     int m_animationStep;
 };