1 files changed, 61 insertions, 1 deletions

diff --git a/org.eclipse.debug.ui/ui/org/eclipse/debug/internal/ui/actions/breakpoints/BreakpointsExpandAllAction.java b/org.eclipse.debug.ui/ui/org/eclipse/debug/internal/ui/actions/breakpoints/BreakpointsExpandAllAction.java
index 85620b3b6..4940ae95b 100644
--- a/org.eclipse.debug.ui/ui/org/eclipse/debug/internal/ui/actions/breakpoints/BreakpointsExpandAllAction.java
+++ b/org.eclipse.debug.ui/ui/org/eclipse/debug/internal/ui/actions/breakpoints/BreakpointsExpandAllAction.java
@@ -11,26 +11,50 @@
  *******************************************************************************/
 package org.eclipse.debug.internal.ui.actions.breakpoints;
 
+import org.eclipse.debug.internal.ui.viewers.model.IInternalTreeModelViewer;
+import org.eclipse.debug.internal.ui.viewers.model.provisional.IModelChangedListener;
+import org.eclipse.debug.internal.ui.viewers.model.provisional.IModelDelta;
+import org.eclipse.debug.internal.ui.viewers.model.provisional.IModelProxy;
+import org.eclipse.debug.internal.ui.viewers.model.provisional.ITreeModelViewer;
+import org.eclipse.debug.internal.ui.viewers.model.provisional.IViewerUpdate;
+import org.eclipse.debug.internal.ui.viewers.model.provisional.IViewerUpdateListener;
 import org.eclipse.debug.internal.ui.views.breakpoints.BreakpointsView;
 import org.eclipse.jface.action.IAction;
 import org.eclipse.jface.viewers.ISelection;
+import org.eclipse.jface.viewers.TreePath;
+import org.eclipse.swt.widgets.Event;
+import org.eclipse.ui.IActionDelegate2;
 import org.eclipse.ui.IViewActionDelegate;
 import org.eclipse.ui.IViewPart;
 
 /**
  * Action which fully expands the tree in the breakpoints view.
  */
-public class BreakpointsExpandAllAction implements IViewActionDelegate {	
+public class BreakpointsExpandAllAction implements IViewActionDelegate, IActionDelegate2, IViewerUpdateListener, IModelChangedListener {	
 	
+    private IAction fAction;
 	private BreakpointsView fView;
 
+    public void init(IAction action) {
+        fAction = action;
+    }
+
 	/* (non-Javadoc)
 	 * @see org.eclipse.ui.IViewActionDelegate#init(org.eclipse.ui.IViewPart)
 	 */
 	public void init(IViewPart view) {
 		fView = (BreakpointsView) view;
+		IInternalTreeModelViewer viewer = (IInternalTreeModelViewer)fView.getViewer();
+		if (viewer != null) {
+		    viewer.addViewerUpdateListener(this);
+		    viewer.addModelChangedListener(this);
+		}
 	}
 
+    public void runWithEvent(IAction action, Event event) {
+        run(action);   
+    }
+
 	/* (non-Javadoc)
 	 * @see org.eclipse.ui.IActionDelegate#run(org.eclipse.jface.action.IAction)
 	 */
@@ -44,4 +68,40 @@ public class BreakpointsExpandAllAction implements IViewActionDelegate {
 	public void selectionChanged(IAction action, ISelection selection) {
 	}
 
+
+    public void dispose() {
+        ITreeModelViewer viewer = (ITreeModelViewer)fView.getViewer();
+        if (viewer != null) {
+            viewer.removeViewerUpdateListener(this);
+            viewer.removeModelChangedListener(this);
+        }
+    }
+
+    public void viewerUpdatesBegin() {
+    }
+
+    public void viewerUpdatesComplete() {
+    }
+
+    public void updateStarted(IViewerUpdate update) {
+    }
+    
+    public void updateComplete(IViewerUpdate update) {
+          if (!update.isCanceled()) {
+              if (TreePath.EMPTY.equals(update.getElementPath())) {
+                  update();
+              }
+          }        
+    }
+    
+    private void update() {
+        IInternalTreeModelViewer viewer = (IInternalTreeModelViewer)fView.getViewer();
+        if (viewer != null && fAction != null) {
+            fAction.setEnabled(viewer.getInput() != null && viewer.getChildCount(TreePath.EMPTY) > 0);
+        }
+    }
+    
+    public void modelChanged(IModelDelta delta, IModelProxy proxy) {
+        update();
+    }
 }