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

[dolphin.git] / src / pixmapviewer.cpp

diff --git a/src/pixmapviewer.cpp b/src/pixmapviewer.cpp
index 4fe451a8c6416a869d4dff7c3314edc491f24fa9..36d583c1d059ddd2241e573a7c1ba4f06d1a615b 100644 (file)
--- a/src/pixmapviewer.cpp
+++ b/src/pixmapviewer.cpp
@@ -26,10 +26,14 @@
 #include <QtGui/QPaintEvent>
 
 PixmapViewer::PixmapViewer(QWidget* parent) :
-    QWidget(parent)
+    QWidget(parent),
+    m_animationStep(0)
 {
     setMinimumWidth(K3Icon::SizeEnormous);
     setMinimumWidth(K3Icon::SizeEnormous);
+
+    m_animation.setDuration(300);
+    connect(&m_animation, SIGNAL(valueChanged(qreal)), this, SLOT(update()));
 }
 
 PixmapViewer::~PixmapViewer()
@@ -38,20 +42,34 @@ PixmapViewer::~PixmapViewer()
 
 void PixmapViewer::setPixmap(const QPixmap& pixmap)
 {
+    if (pixmap.isNull()) {
+        return;
+    }
+
+    m_oldPixmap = m_pixmap.isNull() ? pixmap : m_pixmap;
     m_pixmap = pixmap;
-    update();
+
+    m_animation.start();
 }
 
 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;
-    painter.drawPixmap(x, y, m_pixmap);
-    painter.end();
+    QPainter painter(this);
+
+    const float value = m_animation.currentValue();
+
+    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;
+
+    if (m_oldPixmap.width() > m_pixmap.width()) {
+        painter.drawPixmap(x, y, m_oldPixmap.scaled(scaledWidth, scaledHeight));
+    } else {
+        painter.drawPixmap(x, y, m_pixmap.scaled(scaledWidth, scaledHeight));
+    }
 }
 
 #include "pixmapviewer.moc"