1 files changed, 81 insertions, 0 deletions
diff --git a/src-qt5/desktop-utils/lumina-photo/PhotoView.cpp b/src-qt5/desktop-utils/lumina-photo/PhotoView.cpp
new file mode 100644
index 00000000..718edf99
--- /dev/null
+++ b/src-qt5/desktop-utils/lumina-photo/PhotoView.cpp
@@ -0,0 +1,81 @@
+
+#include "PhotoView.h"
+#include <QDebug>
+#include <QWheelEvent>
+
+PhotoView::PhotoView (QWidget *parent) : QGraphicsView (parent)
+{
+    setCacheMode (CacheBackground);
+    setViewportUpdateMode (BoundingRectViewportUpdate);
+    setRenderHint (QPainter::HighQualityAntialiasing);
+    setTransformationAnchor (AnchorUnderMouse);
+}
+
+void PhotoView::zoomIn ()
+{
+    scale (scaleFactor, scaleFactor);
+    isFit = false;
+}
+
+void PhotoView::zoomOut ()
+{
+    scale (invScaleFactor, invScaleFactor);
+    isFit = false;
+}
+
+void PhotoView::zoomNormal ()
+{
+    resetMatrix ();
+    isFit = false;
+}
+
+void PhotoView::zoomFit ()
+{
+    fitInView (sceneRect (), Qt::KeepAspectRatio);
+    isFit = true;
+}
+
+bool PhotoView::eventFilter (QObject *, QEvent *event)
+{
+    if (event->type () == QEvent::Wheel)
+    {
+        QWheelEvent *wheel_event = static_cast<QWheelEvent *> (event);
+        if (wheel_event->delta () > 0)
+        {
+            if (wheel_event->modifiers () == Qt::ControlModifier)
+            {
+                emit nextImage ();
+            }
+            else
+            {
+                scale (scaleFactor, scaleFactor);
+                return true;
+            }
+        }
+        else if (wheel_event->delta () < 0)
+        {
+            if (wheel_event->modifiers () == Qt::ControlModifier)
+            {
+                emit prevImage ();
+            }
+            else
+            {
+                scale (invScaleFactor, invScaleFactor);
+                return true;
+            }
+        }
+    }
+
+    return false;
+}
+
+void PhotoView::mouseDoubleClickEvent (QMouseEvent *event)
+{
+    if (event->button () == Qt::LeftButton)
+    {
+        if (isFit)
+            zoomNormal ();
+        else
+            zoomFit ();
+    }
+}