Bug 176627 - [Registers view] Switching stack frames: Unnecessary scrolling to top and group closing

1 files changed, 128 insertions, 0 deletions

diff --git a/org.eclipse.debug.ui/ui/org/eclipse/debug/internal/ui/viewers/model/ViewerInputUpdate.java b/org.eclipse.debug.ui/ui/org/eclipse/debug/internal/ui/viewers/model/ViewerInputUpdate.java
new file mode 100644
index 000000000..9c69c018c
--- /dev/null
+++ b/org.eclipse.debug.ui/ui/org/eclipse/debug/internal/ui/viewers/model/ViewerInputUpdate.java
@@ -0,0 +1,128 @@
+package org.eclipse.debug.internal.ui.viewers.model;
+
+import org.eclipse.core.runtime.IProgressMonitor;
+import org.eclipse.core.runtime.IStatus;
+import org.eclipse.core.runtime.Status;
+import org.eclipse.debug.internal.core.commands.Request;
+import org.eclipse.debug.internal.ui.viewers.model.provisional.IPresentationContext;
+import org.eclipse.debug.internal.ui.viewers.model.provisional.IViewerInputRequestor;
+import org.eclipse.debug.internal.ui.viewers.model.provisional.IViewerInputUpdate;
+import org.eclipse.jface.viewers.TreePath;
+import org.eclipse.ui.progress.WorkbenchJob;
+
+/**
+ * Internal implementation of the {@link IViewerInputUpdate} interface.  Allows
+ * implementors to translate the active debug context into an appropriate viewer
+ * input.
+ * 
+ * @since 3.4
+ * @see IViewerInputUpdate
+ */
+public class ViewerInputUpdate extends Request implements IViewerInputUpdate {
+
+    /**
+     * Presentation context
+     */
+    private IPresentationContext fContext;
+    
+    /**
+     * New viewer input
+     */
+    private Object fSource;
+    
+    /**
+     * Whether this update is done
+     */
+    private boolean fDone;
+    
+    /**
+     * Viewer input to use
+     */
+    private Object fInput;
+    
+    /**
+     * Client making request
+     */
+    private IViewerInputRequestor fRequestor;
+    
+    /**
+     * When <code>done()</code> is called, the viewer must be informed that the update is complete in the UI thread.
+     */
+    protected WorkbenchJob fViewerInputUpdateJob = new WorkbenchJob("Asynchronous viewer input update") { //$NON-NLS-1$
+        public IStatus runInUIThread(IProgressMonitor monitor) {
+            fRequestor.viewerInputComplete(ViewerInputUpdate.this);
+            return Status.OK_STATUS;
+        }
+    };
+    
+    /**
+     * Constructs a viewer input update request.
+     * 
+     * @param context presentation context
+     * @param requestor client making the request
+     * @param source source from which to derive a viewer input
+     */
+    public ViewerInputUpdate(IPresentationContext context, IViewerInputRequestor requestor, Object source){
+    	fContext = context;
+    	fSource = source;
+    	fRequestor = requestor;
+    }
+
+	/* (non-Javadoc)
+	 * @see org.eclipse.debug.internal.ui.viewers.model.provisional.IViewerInputUpdate#getPresentationContext()
+	 */
+	public IPresentationContext getPresentationContext() {
+		return fContext;
+	}
+	
+	/* (non-Javadoc)
+     * @see org.eclipse.core.runtime.IProgressMonitor#done()
+     */
+    public final void done() {
+    	synchronized (this) {
+    		if (isDone()) {
+    			return;
+    		}
+    		fDone = true;
+		}
+        fViewerInputUpdateJob.schedule();
+	}
+    
+    /**
+     * Returns whether this request is done yet.
+     * 
+     * @return whether this request is done yet
+     */
+    protected synchronized boolean isDone() {
+    	return fDone;
+    }
+
+	/* (non-Javadoc)
+	 * @see org.eclipse.debug.internal.ui.viewers.model.provisional.IViewerInputUpdate#getElement()
+	 */
+	public Object getElement() {
+		return fSource;
+	}
+
+	/* (non-Javadoc)
+	 * @see org.eclipse.debug.internal.ui.viewers.model.provisional.IViewerUpdate#getElementPath()
+	 */
+	public TreePath getElementPath() {
+		return TreePath.EMPTY;
+	}
+
+	/* (non-Javadoc)
+	 * @see org.eclipse.debug.internal.ui.viewers.model.provisional.IViewerInputUpdate#setViewerInput(java.lang.Object)
+	 */
+	public void setViewerInput(Object element) {
+		fInput = element;
+	}
+	
+	/* (non-Javadoc)
+	 * @see org.eclipse.debug.internal.ui.viewers.model.provisional.IViewerInputUpdate#getViewerInput()
+	 */
+	public Object getViewerInput() {
+		return fInput;
+	}
+
+}