image viewer: pinch to zoom

anveshkolluri93 · Jun 21, 2014 · bb07a8e · bb07a8e
1 parent fa6bc35
commit bb07a8e
Showing 1 changed file with 15 additions and 2 deletions.
diff --git a/images/src/org/intellij/images/editor/impl/ImageEditorUI.java b/images/src/org/intellij/images/editor/impl/ImageEditorUI.java
@@ -27,6 +27,7 @@
 import com.intellij.ui.PopupHandler;
 import com.intellij.ui.ScrollPaneFactory;
 import com.intellij.ui.components.JBLayeredPane;
+import com.intellij.ui.components.Magnificator;
 import com.intellij.util.ui.UIUtil;
 import org.intellij.images.ImagesBundle;
 import org.intellij.images.editor.ImageDocument;
@@ -191,12 +192,24 @@ ImageZoomModel getZoomModel() {
     return zoomModel;
   }
 
-  private static final class ImageContainerPane extends JBLayeredPane {
+  private final class ImageContainerPane extends JBLayeredPane {
     private final ImageComponent imageComponent;
 
-    public ImageContainerPane(ImageComponent imageComponent) {
+    public ImageContainerPane(final ImageComponent imageComponent) {
       this.imageComponent = imageComponent;
       add(imageComponent);
+
+      putClientProperty(Magnificator.CLIENT_PROPERTY_KEY, new Magnificator() {
+        @Override
+        public Point magnify(double scale, Point at) {
+          Point locationBefore = imageComponent.getLocation();
+          ImageZoomModel model = editor.getZoomModel();
+          double factor = model.getZoomFactor();
+          model.setZoomFactor(scale * factor);
+          return new Point(((int)((at.x - Math.max(scale > 1.0 ? locationBefore.x : 0, 0)) * scale)), 
+                           ((int)((at.y - Math.max(scale > 1.0 ? locationBefore.y : 0, 0)) * scale)));
+        }
+      });
     }
 
     private void centerComponents() {