Warp to source editor on widget double click

Update mouse handler such that a double click will look up the
corresponding XML element, front the XML source editor and select the
text range (scrolling if necessary) to reveal the corresponding tag.

Change-Id: Iaa3d6f845c3fea190c304a07fab07314baa3f638

3 files changed, 66 insertions, 1 deletions

diff --git a/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/eclipse/adt/internal/editors/AndroidXmlEditor.java b/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/eclipse/adt/internal/editors/AndroidXmlEditor.java
index 18f1e28..a1b9d13 100644
--- a/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/eclipse/adt/internal/editors/AndroidXmlEditor.java
+++ b/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/eclipse/adt/internal/editors/AndroidXmlEditor.java
@@ -62,10 +62,12 @@ import org.eclipse.wst.sse.core.StructuredModelManager;
 import org.eclipse.wst.sse.core.internal.provisional.IModelManager;
 import org.eclipse.wst.sse.core.internal.provisional.IModelStateListener;
 import org.eclipse.wst.sse.core.internal.provisional.IStructuredModel;
+import org.eclipse.wst.sse.core.internal.provisional.IndexedRegion;
 import org.eclipse.wst.sse.core.internal.provisional.text.IStructuredDocument;
 import org.eclipse.wst.sse.ui.StructuredTextEditor;
 import org.eclipse.wst.xml.core.internal.provisional.document.IDOMModel;
 import org.w3c.dom.Document;
+import org.w3c.dom.Node;
 
 import java.net.MalformedURLException;
 import java.net.URL;
@@ -870,6 +872,38 @@ public abstract class AndroidXmlEditor extends FormEditor implements IResourceCh
         return null;
     }
 
+    /**
+     * Shows the editor range corresponding to the given XML node. This will
+     * front the editor and select the text range.
+     *
+     * @param xmlNode The DOM node to be shown. The DOM node should be an XML
+     *            node from the existing XML model used by the structured XML
+     *            editor; it will not do attribute matching to find a
+     *            "corresponding" element in the document from some foreign DOM
+     *            tree.
+     * @return True if the node was shown.
+     */
+    @SuppressWarnings("restriction") // Yes, this method relies a lot on restricted APIs
+    public boolean show(Node xmlNode) {
+        if (xmlNode instanceof IndexedRegion) {
+            IndexedRegion region = (IndexedRegion)xmlNode;
+
+            IEditorPart textPage = getEditor(mTextPageIndex);
+            if (textPage instanceof StructuredTextEditor) {
+                StructuredTextEditor editor = (StructuredTextEditor) textPage;
+
+                setActivePage(AndroidXmlEditor.TEXT_EDITOR_ID);
+
+                // Note - we cannot use region.getLength() because that seems to
+                // always return 0.
+                int regionLength = region.getEndOffset() - region.getStartOffset();
+                editor.selectAndReveal(region.getStartOffset(), regionLength);
+                return true;
+            }
+        }
+
+        return false;
+    }
 
     /**
      * Listen to changes in the underlying XML model in the structured editor.
diff --git a/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/eclipse/adt/internal/editors/layout/gle2/CanvasViewInfo.java b/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/eclipse/adt/internal/editors/layout/gle2/CanvasViewInfo.java
index 2781d1a..f4dce0f 100755
--- a/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/eclipse/adt/internal/editors/layout/gle2/CanvasViewInfo.java
+++ b/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/eclipse/adt/internal/editors/layout/gle2/CanvasViewInfo.java
@@ -24,6 +24,7 @@ import org.eclipse.swt.graphics.Rectangle;
 import org.eclipse.ui.views.properties.IPropertyDescriptor;
 import org.eclipse.ui.views.properties.IPropertySheetPage;
 import org.eclipse.ui.views.properties.IPropertySource;
+import org.w3c.dom.Node;
 
 import java.util.ArrayList;
 
@@ -242,4 +243,19 @@ public class CanvasViewInfo implements IPropertySource {
             ((IPropertySource) uiView).setPropertyValue(id, value);
         }
     }
+
+    /**
+     * Returns the XML node corresponding to this info, or null if there is no
+     * such XML node.
+     *
+     * @return The XML node corresponding to this info object, or null
+     */
+    public Node getXmlNode() {
+        UiViewElementNode uiView = getUiViewKey();
+        if (uiView != null) {
+            return uiView.getXmlNode();
+        }
+
+        return null;
+    }
 }
diff --git a/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/eclipse/adt/internal/editors/layout/gle2/LayoutCanvas.java b/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/eclipse/adt/internal/editors/layout/gle2/LayoutCanvas.java
index 44a2e74..29094b7 100755
--- a/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/eclipse/adt/internal/editors/layout/gle2/LayoutCanvas.java
+++ b/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/eclipse/adt/internal/editors/layout/gle2/LayoutCanvas.java
@@ -1328,7 +1328,22 @@ class LayoutCanvas extends Canvas implements ISelectionProvider {
     }
 
     private void onDoubleClick(MouseEvent e) {
-        // pass, not used yet.
+        // Warp to the text editor and show the corresponding XML for the
+        // double-clicked widget
+        int x = mHScale.inverseTranslate(e.x);
+        int y = mVScale.inverseTranslate(e.y);
+        CanvasViewInfo vi = findViewInfoAt(x, y);
+        if (vi == null) {
+            return;
+        }
+
+        Node xmlNode = vi.getXmlNode();
+        if (xmlNode != null) {
+            boolean found = mLayoutEditor.show(xmlNode);
+            if (!found) {
+                getDisplay().beep();
+            }
+        }
     }
 
     /**