Attachment 151809 Details for Bug 255026 – Experimental expression "inspector"

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[patch] Experimental expression "inspector"

255026.patch (text/plain), 45.09 KB, created by Anton Leherbauer

on 2009-11-10 08:29:13 EST

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Filename:

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Creator: Anton Leherbauer

Created: 2009-11-10 08:29:13 EST

Size: 45.09 KB

patch

obsolete

>### Eclipse Workspace Patch 1.0
>#P org.eclipse.cdt.dsf.gdb.ui
>Index: src/org/eclipse/cdt/dsf/gdb/internal/ui/viewmodel/GdbViewModelAdapter.java
>===================================================================
>RCS file: /cvsroot/tools/org.eclipse.cdt/dsf-gdb/org.eclipse.cdt.dsf.gdb.ui/src/org/eclipse/cdt/dsf/gdb/internal/ui/viewmodel/GdbViewModelAdapter.java,v
>retrieving revision 1.1
>diff -u -r1.1 GdbViewModelAdapter.java
>--- src/org/eclipse/cdt/dsf/gdb/internal/ui/viewmodel/GdbViewModelAdapter.java	8 Jan 2009 21:06:30 -0000	1.1
>+++ src/org/eclipse/cdt/dsf/gdb/internal/ui/viewmodel/GdbViewModelAdapter.java	10 Nov 2009 13:28:27 -0000
>@@ -1,5 +1,5 @@
> /*******************************************************************************
>- * Copyright (c) 2006, 2008 Wind River Systems and others.
>+ * Copyright (c) 2006, 2009 Wind River Systems and others.
>  * All rights reserved. This program and the accompanying materials
>  * are made available under the terms of the Eclipse Public License v1.0
>  * which accompanies this distribution, and is available at
>@@ -11,6 +11,7 @@
> package org.eclipse.cdt.dsf.gdb.internal.ui.viewmodel;
> 
> import org.eclipse.cdt.dsf.concurrent.ThreadSafe;
>+import org.eclipse.cdt.dsf.debug.ui.IDsfDebugUIConstants;
> import org.eclipse.cdt.dsf.debug.ui.viewmodel.AbstractDebugVMAdapter;
> import org.eclipse.cdt.dsf.debug.ui.viewmodel.SteppingController;
> import org.eclipse.cdt.dsf.debug.ui.viewmodel.expression.ExpressionVMProvider;
>@@ -28,7 +29,6 @@
>  * 
>  */
> @ThreadSafe
>-@SuppressWarnings("restriction")
> public class GdbViewModelAdapter extends AbstractDebugVMAdapter
> {
>     public GdbViewModelAdapter(DsfSession session, SteppingController controller) {
>@@ -52,6 +52,8 @@
>             return new RegisterVMProvider(this, context, getSession());
>         } else if (IDebugUIConstants.ID_EXPRESSION_VIEW.equals(context.getId()) ) {
>             return new ExpressionVMProvider(this, context, getSession());
>+        } else if (IDsfDebugUIConstants.ID_EXPRESSION_HOVER.equals(context.getId()) ) {
>+            return new ExpressionVMProvider(this, context, getSession());
>         } else if (IDebugUIConstants.ID_MODULE_VIEW.equals(context.getId()) ) {
>             return new ModulesVMProvider(this, context, getSession());
>         }
>Index: src/org/eclipse/cdt/dsf/gdb/internal/ui/GdbAdapterFactory.java
>===================================================================
>RCS file: /cvsroot/tools/org.eclipse.cdt/dsf-gdb/org.eclipse.cdt.dsf.gdb.ui/src/org/eclipse/cdt/dsf/gdb/internal/ui/GdbAdapterFactory.java,v
>retrieving revision 1.4
>diff -u -r1.4 GdbAdapterFactory.java
>--- src/org/eclipse/cdt/dsf/gdb/internal/ui/GdbAdapterFactory.java	10 Sep 2009 20:41:35 -0000	1.4
>+++ src/org/eclipse/cdt/dsf/gdb/internal/ui/GdbAdapterFactory.java	10 Nov 2009 13:28:27 -0000
>@@ -1,5 +1,5 @@
> /*******************************************************************************
>- * Copyright (c) 2006, 2008 Wind River Systems and others.
>+ * Copyright (c) 2006, 2009 Wind River Systems and others.
>  * All rights reserved. This program and the accompanying materials
>  * are made available under the terms of the Eclipse Public License v1.0
>  * which accompanies this distribution, and is available at
>@@ -67,6 +67,7 @@
> import org.eclipse.debug.internal.ui.viewers.model.provisional.IElementContentProvider;
> import org.eclipse.debug.internal.ui.viewers.model.provisional.IModelProxyFactory;
> import org.eclipse.debug.internal.ui.viewers.model.provisional.IModelSelectionPolicyFactory;
>+import org.eclipse.debug.internal.ui.viewers.model.provisional.IViewerInputProvider;
> import org.eclipse.debug.ui.contexts.ISuspendTrigger;
> import org.eclipse.debug.ui.sourcelookup.ISourceDisplay;
> 
>@@ -115,7 +116,8 @@
>             session.registerModelAdapter(SteppingController.class, fSteppingController);
> 
>             fViewModelAdapter = new GdbViewModelAdapter(session, fSteppingController);
>-
>+			session.registerModelAdapter(IViewerInputProvider.class, fViewModelAdapter);
>+			
>             if (launch.getSourceLocator() instanceof ISourceLookupDirector) {
>                 fSourceDisplayAdapter = new DsfSourceDisplayAdapter(session, (ISourceLookupDirector)launch.getSourceLocator(), fSteppingController);
>             } else {
>Index: src/org/eclipse/cdt/dsf/gdb/internal/ui/GdbDebugTextHover.java
>===================================================================
>RCS file: /cvsroot/tools/org.eclipse.cdt/dsf-gdb/org.eclipse.cdt.dsf.gdb.ui/src/org/eclipse/cdt/dsf/gdb/internal/ui/GdbDebugTextHover.java,v
>retrieving revision 1.1
>diff -u -r1.1 GdbDebugTextHover.java
>--- src/org/eclipse/cdt/dsf/gdb/internal/ui/GdbDebugTextHover.java	10 Nov 2009 00:07:39 -0000	1.1
>+++ src/org/eclipse/cdt/dsf/gdb/internal/ui/GdbDebugTextHover.java	10 Nov 2009 13:28:27 -0000
>@@ -25,4 +25,8 @@
>         return GdbLaunchDelegate.GDB_DEBUG_MODEL_ID;
>     }
> 
>+    @Override
>+    protected boolean useExpressionExplorer() {
>+    	return true;
>+    }
> }
>#P org.eclipse.cdt.dsf.ui
>Index: src/org/eclipse/cdt/dsf/debug/ui/AbstractDsfDebugTextHover.java
>===================================================================
>RCS file: /cvsroot/tools/org.eclipse.cdt/dsf/org.eclipse.cdt.dsf.ui/src/org/eclipse/cdt/dsf/debug/ui/AbstractDsfDebugTextHover.java,v
>retrieving revision 1.2
>diff -u -r1.2 AbstractDsfDebugTextHover.java
>--- src/org/eclipse/cdt/dsf/debug/ui/AbstractDsfDebugTextHover.java	10 Nov 2009 12:21:23 -0000	1.2
>+++ src/org/eclipse/cdt/dsf/debug/ui/AbstractDsfDebugTextHover.java	10 Nov 2009 13:28:48 -0000
>@@ -17,6 +17,9 @@
> 
> package org.eclipse.cdt.dsf.debug.ui;
> 
>+import java.util.concurrent.Callable;
>+import java.util.concurrent.ExecutionException;
>+
> import org.eclipse.cdt.debug.ui.editors.AbstractDebugTextHover;
> import org.eclipse.cdt.dsf.concurrent.DataRequestMonitor;
> import org.eclipse.cdt.dsf.concurrent.Query;
>@@ -31,19 +34,37 @@
> import org.eclipse.cdt.dsf.service.DsfSession;
> import org.eclipse.core.runtime.IAdaptable;
> import org.eclipse.debug.core.model.IDebugModelProvider;
>+import org.eclipse.jface.text.BadLocationException;
>+import org.eclipse.jface.text.DefaultInformationControl;
>+import org.eclipse.jface.text.IDocument;
>+import org.eclipse.jface.text.IInformationControl;
>+import org.eclipse.jface.text.IInformationControlCreator;
>+import org.eclipse.jface.text.IRegion;
>+import org.eclipse.jface.text.ITextHoverExtension2;
>+import org.eclipse.jface.text.ITextViewer;
>+import org.eclipse.swt.widgets.Shell;
>+import org.eclipse.ui.editors.text.EditorsUI;
> 
> /**
>- * An implementation of AbstractDebugTextHover using DSF services.
>+ * An implementation of AbstractDebugTextHover using DSF services
>  * 
>  * @since 2.1
>  */
>-abstract public class AbstractDsfDebugTextHover extends AbstractDebugTextHover {
>+abstract public class AbstractDsfDebugTextHover extends AbstractDebugTextHover implements ITextHoverExtension2 {
> 
>     /**
>      * Returns the debug model ID of that this debug text hover is to be used for.
>      */
>     abstract protected String getModelId();
>     
>+    /**
>+     * Returns whether the expression explorer information control should be used.
>+     * The default implementation returns <code>false</code>.
>+     */
>+    protected boolean useExpressionExplorer() {
>+    	return false;
>+    }
>+    
> 	private static class GetExpressionValueQuery extends Query<FormattedValueDMData> {
>     	private final IFrameDMContext frame;
>     	private final String expression;
>@@ -128,4 +149,73 @@
>         return null;
> 	}
> 
>+	@Override
>+	public IInformationControlCreator getHoverControlCreator() {
>+		if (useExpressionExplorer()) {
>+			return new ExpressionInformationControlCreator();
>+		} else {
>+			return new IInformationControlCreator() {
>+				public IInformationControl createInformationControl(Shell parent) {
>+					return new DefaultInformationControl(parent, EditorsUI.getTooltipAffordanceString());
>+				}
>+			};
>+		}
>+	}
>+
>+	/*
>+	 * @see org.eclipse.jface.text.ITextHoverExtension2#getHoverInfo2(org.eclipse.jface.text.ITextViewer, org.eclipse.jface.text.IRegion)
>+	 */
>+	public Object getHoverInfo2(ITextViewer textViewer, IRegion hoverRegion) {
>+    	final String simpleInfo = getHoverInfo(textViewer, hoverRegion);
>+		if (!useExpressionExplorer() || simpleInfo == null) {
>+    		return simpleInfo;
>+    	}
>+		// improved version using ExpressionInformationControlCreator
>+    	// see also getHoverControlCreator()
>+    	final String text = getExpressionText(textViewer, hoverRegion);
>+    	if (text != null && text.length() > 0) {
>+			final IFrameDMContext frameDmc = getFrame();
>+			final DsfSession dsfSession = DsfSession.getSession(frameDmc.getSessionId());
>+			Callable<IExpressionDMContext> callable = new Callable<IExpressionDMContext>() {
>+				public IExpressionDMContext call() throws Exception {
>+					DsfServicesTracker tracker = new DsfServicesTracker(DsfUIPlugin.getBundleContext(), frameDmc.getSessionId());
>+					try {
>+						IExpressions expressions = tracker.getService(IExpressions.class);
>+						if (expressions != null) {
>+							return expressions.createExpression(frameDmc, text);
>+						}
>+						return null;
>+					} finally {
>+						tracker.dispose();
>+					}
>+				}
>+			};
>+			try {
>+				return dsfSession.getExecutor().submit(callable).get();
>+			} catch (InterruptedException e) {
>+			} catch (ExecutionException e) {
>+			}
>+    	}
>+    	return null;
>+	}
>+
>+	private String getExpressionText(ITextViewer textViewer, IRegion hoverRegion) {
>+		IDocument document = textViewer.getDocument();
>+		if (document == null)
>+			return null;
>+		String expression;
>+		try {
>+			expression= document.get(hoverRegion.getOffset(),
>+					hoverRegion.getLength());
>+		} catch (BadLocationException exc) {
>+			return null;
>+		}
>+		if (expression == null)
>+			return null;
>+		expression = expression.trim();
>+		if (expression.length() == 0)
>+			return null;
>+		return expression;
>+	}
>+
> }
>Index: src/org/eclipse/cdt/dsf/debug/ui/IDsfDebugUIConstants.java
>===================================================================
>RCS file: /cvsroot/tools/org.eclipse.cdt/dsf/org.eclipse.cdt.dsf.ui/src/org/eclipse/cdt/dsf/debug/ui/IDsfDebugUIConstants.java,v
>retrieving revision 1.3
>diff -u -r1.3 IDsfDebugUIConstants.java
>--- src/org/eclipse/cdt/dsf/debug/ui/IDsfDebugUIConstants.java	31 Mar 2009 21:25:23 -0000	1.3
>+++ src/org/eclipse/cdt/dsf/debug/ui/IDsfDebugUIConstants.java	10 Nov 2009 13:28:48 -0000
>@@ -1,5 +1,5 @@
> /*******************************************************************************
>- * Copyright (c) 2006, 2008 Wind River Systems and others.
>+ * Copyright (c) 2006, 2009 Wind River Systems and others.
>  * All rights reserved. This program and the accompanying materials
>  * are made available under the terms of the Eclipse Public License v1.0
>  * which accompanies this distribution, and is available at
>@@ -79,4 +79,11 @@
>      * @since 2.0 
>      */
>     public static final String PREF_COLOR_STALE_DATA_BACKGROUND= PLUGIN_ID + ".staledata.background"; //$NON-NLS-1$
>+
>+    /**
>+     * Presentation context id for the expression hover.
>+     * 
>+     * @since 2.1
>+     */
>+	public static final String ID_EXPRESSION_HOVER= PLUGIN_ID + ".expression_hover"; //$NON-NLS-1$
> }
>Index: src/org/eclipse/cdt/dsf/debug/ui/viewmodel/expression/ExpressionVMProvider.java
>===================================================================
>RCS file: /cvsroot/tools/org.eclipse.cdt/dsf/org.eclipse.cdt.dsf.ui/src/org/eclipse/cdt/dsf/debug/ui/viewmodel/expression/ExpressionVMProvider.java,v
>retrieving revision 1.2
>diff -u -r1.2 ExpressionVMProvider.java
>--- src/org/eclipse/cdt/dsf/debug/ui/viewmodel/expression/ExpressionVMProvider.java	10 Mar 2009 23:47:13 -0000	1.2
>+++ src/org/eclipse/cdt/dsf/debug/ui/viewmodel/expression/ExpressionVMProvider.java	10 Nov 2009 13:28:48 -0000
>@@ -1,5 +1,5 @@
> /*******************************************************************************
>- * Copyright (c) 2006, 2008 Wind River Systems and others.
>+ * Copyright (c) 2006, 2009 Wind River Systems and others.
>  * All rights reserved. This program and the accompanying materials
>  * are made available under the terms of the Eclipse Public License v1.0
>  * which accompanies this distribution, and is available at
>@@ -19,6 +19,7 @@
> import org.eclipse.cdt.dsf.debug.service.ICachingService;
> import org.eclipse.cdt.dsf.debug.service.IExpressions;
> import org.eclipse.cdt.dsf.debug.service.IRegisters;
>+import org.eclipse.cdt.dsf.debug.service.IExpressions.IExpressionDMContext;
> import org.eclipse.cdt.dsf.debug.service.IRunControl.ISuspendedDMEvent;
> import org.eclipse.cdt.dsf.debug.ui.DsfDebugUITools;
> import org.eclipse.cdt.dsf.debug.ui.IDsfDebugUIConstants;
>@@ -46,6 +47,7 @@
> import org.eclipse.debug.internal.core.IExpressionsListener2;
> import org.eclipse.debug.internal.ui.viewers.model.provisional.IColumnPresentation;
> import org.eclipse.debug.internal.ui.viewers.model.provisional.IPresentationContext;
>+import org.eclipse.debug.internal.ui.viewers.model.provisional.IViewerInputUpdate;
> import org.eclipse.debug.internal.ui.viewers.model.provisional.ModelDelta;
> import org.eclipse.jface.preference.IPreferenceStore;
> import org.eclipse.jface.util.IPropertyChangeListener;
>@@ -210,8 +212,13 @@
>         /*
>          * Now the Over-arching management node.
>          */
>-        ExpressionManagerVMNode expressionManagerNode = new ExpressionManagerVMNode(this);
>-        addChildNodes(rootNode, new IVMNode[] {expressionManagerNode});
>+        if (IDsfDebugUIConstants.ID_EXPRESSION_HOVER.equals(getPresentationContext().getId())) {
>+        	SingleExpressionVMNode expressionManagerNode = new SingleExpressionVMNode(this);
>+        	addChildNodes(rootNode, new IVMNode[] { expressionManagerNode });
>+        } else {
>+            ExpressionManagerVMNode expressionManagerNode = new ExpressionManagerVMNode(this);
>+            addChildNodes(rootNode, new IVMNode[] {expressionManagerNode});
>+        }
>         
>         /*
>          *  The expression view wants to support fully all of the components of the register view.
>@@ -372,4 +379,20 @@
>             // Session disposed, ignore.
>         }
>     }
>+
>+    @Override
>+    public void update(IViewerInputUpdate update) {
>+        if (IDsfDebugUIConstants.ID_EXPRESSION_HOVER.equals(getPresentationContext().getId())) {
>+        	Object input = update.getElement();
>+        	if (input instanceof IExpressionDMContext) {
>+        		IExpressionDMContext dmc= (IExpressionDMContext) input;
>+        		SingleExpressionVMNode vmNode = (SingleExpressionVMNode) getChildVMNodes(getRootVMNode())[0];
>+        		vmNode.setExpression(dmc);
>+				update.setInputElement(vmNode.createVMContext(dmc));
>+        		update.done();
>+        		return;
>+        	}
>+        }
>+        super.update(update);
>+    }
> }
>Index: src/org/eclipse/cdt/dsf/debug/ui/viewmodel/expression/SingleExpressionVMNode.java
>===================================================================
>RCS file: src/org/eclipse/cdt/dsf/debug/ui/viewmodel/expression/SingleExpressionVMNode.java
>diff -N src/org/eclipse/cdt/dsf/debug/ui/viewmodel/expression/SingleExpressionVMNode.java
>--- /dev/null	1 Jan 1970 00:00:00 -0000
>+++ src/org/eclipse/cdt/dsf/debug/ui/viewmodel/expression/SingleExpressionVMNode.java	1 Jan 1970 00:00:00 -0000
>@@ -0,0 +1,327 @@
>+/*******************************************************************************
>+ * Copyright (c) 2009 Wind River Systems, Inc. and others.
>+ * All rights reserved. This program and the accompanying materials
>+ * are made available under the terms of the Eclipse Public License v1.0
>+ * which accompanies this distribution, and is available at
>+ * http://www.eclipse.org/legal/epl-v10.html
>+ *
>+ * Contributors:
>+ *     Wind River Systems - initial API and implementation
>+ *******************************************************************************/
>+
>+package org.eclipse.cdt.dsf.debug.ui.viewmodel.expression;
>+
>+import java.util.LinkedList;
>+import java.util.List;
>+
>+import org.eclipse.cdt.dsf.concurrent.CountingRequestMonitor;
>+import org.eclipse.cdt.dsf.concurrent.DataRequestMonitor;
>+import org.eclipse.cdt.dsf.concurrent.RequestMonitor;
>+import org.eclipse.cdt.dsf.datamodel.IDMContext;
>+import org.eclipse.cdt.dsf.debug.service.IExpressions.IExpressionDMContext;
>+import org.eclipse.cdt.dsf.debug.ui.viewmodel.expression.ExpressionVMProvider;
>+import org.eclipse.cdt.dsf.debug.ui.viewmodel.expression.ExpressionsChangedEvent;
>+import org.eclipse.cdt.dsf.debug.ui.viewmodel.expression.InvalidExpressionVMContext;
>+import org.eclipse.cdt.dsf.ui.concurrent.ViewerCountingRequestMonitor;
>+import org.eclipse.cdt.dsf.ui.viewmodel.AbstractVMContext;
>+import org.eclipse.cdt.dsf.ui.viewmodel.IVMNode;
>+import org.eclipse.cdt.dsf.ui.viewmodel.VMDelta;
>+import org.eclipse.cdt.dsf.ui.viewmodel.datamodel.AbstractDMVMNode;
>+import org.eclipse.cdt.dsf.ui.viewmodel.datamodel.IDMVMContext;
>+import org.eclipse.debug.core.ILaunch;
>+import org.eclipse.debug.core.model.IDebugTarget;
>+import org.eclipse.debug.core.model.IExpression;
>+import org.eclipse.debug.core.model.IValue;
>+import org.eclipse.debug.internal.ui.viewers.model.provisional.IChildrenCountUpdate;
>+import org.eclipse.debug.internal.ui.viewers.model.provisional.IChildrenUpdate;
>+import org.eclipse.debug.internal.ui.viewers.model.provisional.IElementLabelProvider;
>+import org.eclipse.debug.internal.ui.viewers.model.provisional.IHasChildrenUpdate;
>+import org.eclipse.debug.internal.ui.viewers.model.provisional.ILabelUpdate;
>+import org.eclipse.debug.internal.ui.viewers.model.provisional.IModelDelta;
>+import org.eclipse.jface.viewers.TreePath;
>+
>+/**
>+ * A VM node for displaying a single expression in the expression hover.
>+ */
>+public class SingleExpressionVMNode extends AbstractDMVMNode implements IElementLabelProvider {
>+
>+	private static class RootDMVMContext extends AbstractVMContext implements IDMVMContext {
>+		private final IDMContext fDmc;
>+		public RootDMVMContext(IVMNode node, IDMContext dmc) {
>+			super(node);
>+			fDmc = dmc;
>+		}
>+		public IDMContext getDMContext() {
>+			return fDmc;
>+		}
>+		@SuppressWarnings("unchecked")
>+		@Override
>+		public Object getAdapter(Class adapter) {
>+            Object superAdapter = super.getAdapter(adapter);
>+            if (superAdapter != null) {
>+                return superAdapter;
>+            } else {
>+                // Delegate to the Data Model to find the context.
>+                if (adapter.isInstance(fDmc)) {
>+                    return fDmc;
>+                } else {
>+                    return fDmc.getAdapter(adapter);
>+                }
>+            }
>+		}
>+
>+		@Override
>+		public boolean equals(Object other) {
>+            if (!(other instanceof RootDMVMContext)) return false;
>+            RootDMVMContext otherVmc = (RootDMVMContext)other;
>+            return getVMNode().equals(otherVmc.getVMNode()) &&
>+                   fDmc.equals(otherVmc.fDmc);
>+		}
>+
>+		@Override
>+		public int hashCode() {
>+            return getVMNode().hashCode() + fDmc.hashCode(); 
>+		}
>+
>+	}
>+
>+	private static class SimpleExpression implements IExpression {
>+		private String fExpressionText;
>+		SimpleExpression(String text) {
>+			fExpressionText = text;
>+		}
>+		public void dispose() {
>+		}
>+		public IDebugTarget getDebugTarget() {
>+			return null;
>+		}
>+		public String getExpressionText() {
>+			return fExpressionText;
>+		}
>+		public IValue getValue() {
>+			return null;
>+		}
>+		public ILaunch getLaunch() {
>+			return null;
>+		}
>+		public String getModelIdentifier() {
>+			return null;
>+		}
>+		@SuppressWarnings("unchecked")
>+		public Object getAdapter(Class adapter) {
>+			return null;
>+		}
>+
>+	}
>+
>+	private static class SingleExpressionManager {
>+		private static final IExpression[] NO_EXPRESSIONS = {};
>+		IExpression fExpression;
>+		public IExpression[] getExpressions() {
>+			if (fExpression != null) {
>+				return new IExpression[] { fExpression };
>+			}
>+			return NO_EXPRESSIONS;
>+		}
>+		public void setExpression(IExpression expression) {
>+			fExpression = expression;
>+		}
>+
>+	}
>+
>+	/** Local reference to the expression manager */ 
>+    private final SingleExpressionManager fManager;
>+    
>+    public SingleExpressionVMNode(ExpressionVMProvider provider) {
>+        super(provider, provider.getSession(), IExpressionDMContext.class);
>+        fManager = new SingleExpressionManager();
>+    }
>+
>+	@Override
>+    public String toString() {
>+        return "SingleExpressionVMNode";  //$NON-NLS-1$ 
>+    }
>+    
>+    private ExpressionVMProvider getExpressionVMProvider() {
>+        return (ExpressionVMProvider)getVMProvider();
>+    }
>+
>+    @Override
>+	public void update(IHasChildrenUpdate[] updates) {
>+        // Test availability of children based on whether there are any expressions 
>+        // in the manager.  We assume that the getExpressions() will just read 
>+        // local state data, so we don't bother using a job to perform this 
>+        // operation.
>+        for (int i = 0; i < updates.length; i++) {
>+            updates[i].setHasChilren(fManager.getExpressions().length != 0);
>+            updates[i].done();
>+        }
>+    }
>+    
>+    @Override
>+	public void update(IChildrenCountUpdate[] updates) {
>+        for (IChildrenCountUpdate update : updates) {
>+            if (!checkUpdate(update)) continue;
>+
>+            // We assume that the getExpressions() will just read local state data,
>+            // so we don't bother using a job to perform this operation.
>+            update.setChildCount(fManager.getExpressions().length);
>+            update.done();
>+        }
>+    }
>+    
>+    @Override
>+	public void update(final IChildrenUpdate[] updates) {
>+        for (IChildrenUpdate update : updates) {
>+            doUpdateChildren(update);
>+        }        
>+    }
>+    
>+    public void doUpdateChildren(final IChildrenUpdate update) {
>+        final IExpression[] expressions = fManager.getExpressions();
>+        
>+        // For each (expression) element in update, find the layout node that can 
>+        // parse it.  And for each expression that has a corresponding layout node, 
>+        // call IExpressionLayoutNode#getElementForExpression to generate a VMC.
>+        // Since the last is an async call, we need to create a multi-RM to wait
>+        // for all the calls to complete.
>+        final CountingRequestMonitor multiRm = new ViewerCountingRequestMonitor(getVMProvider().getExecutor(), update);
>+        int multiRmCount = 0;
>+        
>+        int lowOffset= update.getOffset();
>+        if (lowOffset < 0) {
>+        	lowOffset = 0;
>+        }
>+		int length= update.getLength();
>+		if (length <= 0) {
>+			length = expressions.length;
>+		}
>+		final int highOffset= lowOffset + length;
>+		for (int i = lowOffset; i < highOffset && i < expressions.length + 1; i++) {
>+            if (i < expressions.length) {
>+                multiRmCount++;
>+                final int childIndex = i;
>+                final IExpression expression = expressions[i];
>+                // getElementForExpression() accepts a IElementsUpdate as an argument.
>+                // Construct an instance of VMElementsUpdate which will call a 
>+                // the request monitor when it is finished.  The request monitor
>+                // will in turn set the element in the update argument in this method. 
>+                ((ExpressionVMProvider)getVMProvider()).update(
>+                    new VMExpressionUpdate(
>+                        update, expression,
>+                        new DataRequestMonitor<Object>(getVMProvider().getExecutor(), multiRm) {
>+                            @Override
>+                            protected void handleSuccess() {
>+                                update.setChild(getData(), childIndex);
>+                                multiRm.done();
>+                            } 
>+                            
>+                            @Override
>+                            protected void handleError() {
>+                                update.setChild(new InvalidExpressionVMContext(SingleExpressionVMNode.this, expression), childIndex);                                
>+                                multiRm.done();
>+                            }
>+                        })
>+                    );
>+            }
>+        }
>+
>+        // If no expressions were parsed, we're finished.
>+        // Set the count to the counting RM.
>+        multiRm.setDoneCount(multiRmCount);
>+    }
>+
>+    public void update(ILabelUpdate[] updates) {
>+        // The label update handler only handles labels for the invalid expression VMCs.
>+        // The expression layout nodes are responsible for supplying label providers 
>+        // for their VMCs.
>+        for (ILabelUpdate update : updates) {
>+        	update.done();
>+        }
>+    }
>+
>+    public int getDeltaFlags(Object event) {
>+        int retVal = 0;
>+
>+        // Add a flag if the list of expressions in the global expression manager has changed.
>+        if (event instanceof ExpressionsChangedEvent) {
>+            retVal |= IModelDelta.ADDED | IModelDelta.REMOVED | IModelDelta.INSERTED | IModelDelta.CONTENT ;
>+        }
>+
>+        for (IExpression expression : fManager.getExpressions()) {
>+            retVal |= getExpressionVMProvider().getDeltaFlagsForExpression(expression, event);
>+        }
>+        
>+        return retVal;
>+    }
>+
>+    public void buildDelta(final Object event, final VMDelta parentDelta, final int nodeOffset, final RequestMonitor requestMonitor) {
>+        if (event instanceof ExpressionsChangedEvent) {
>+            buildDeltaForExpressionsChangedEvent((ExpressionsChangedEvent)event, parentDelta, nodeOffset, requestMonitor);
>+        } else {
>+        
>+            // For each expression, find its corresponding node and ask that
>+            // layout node for its delta flags for given event.  If there are delta flags to be 
>+            // generated, call the asynchronous method to do so.
>+            CountingRequestMonitor multiRm = new CountingRequestMonitor(getExecutor(), requestMonitor);
>+            
>+            int buildDeltaForExpressionCallCount = 0;
>+            
>+            IExpression[] expressions = fManager.getExpressions();
>+            for (int i = 0; i < expressions.length; i++ ) {
>+                int flags = getExpressionVMProvider().getDeltaFlagsForExpression(expressions[i], event);
>+                // If the given expression has no delta flags, skip it.
>+                if (flags == IModelDelta.NO_CHANGE) continue;
>+    
>+                int elementOffset = nodeOffset >= 0 ? nodeOffset + i : -1;
>+                getExpressionVMProvider().buildDeltaForExpression(
>+                    expressions[i], elementOffset, event, parentDelta, getTreePathFromDelta(parentDelta), 
>+                    new RequestMonitor(getExecutor(), multiRm));
>+                buildDeltaForExpressionCallCount++;
>+            }
>+            
>+            multiRm.setDoneCount(buildDeltaForExpressionCallCount);
>+        }
>+    }
>+    
>+    private void buildDeltaForExpressionsChangedEvent(ExpressionsChangedEvent event, VMDelta parentDelta, 
>+        int nodeOffset, RequestMonitor requestMonitor) 
>+    {
>+        CountingRequestMonitor multiRm = new CountingRequestMonitor(getExecutor(), requestMonitor);
>+        for (int i = 0; i < event.getExpressions().length; i++) {
>+            int expIndex = event.getIndex() != -1 
>+                ? nodeOffset + event.getIndex() + i 
>+                : -1; 
>+            getExpressionVMProvider().buildDeltaForExpression(
>+                event.getExpressions()[i], expIndex, event, parentDelta, getTreePathFromDelta(parentDelta), 
>+                new RequestMonitor(getExecutor(), multiRm));                
>+        }
>+        multiRm.setDoneCount(event.getExpressions().length);
>+    }
>+        
>+    private TreePath getTreePathFromDelta(IModelDelta delta) {
>+        List<Object> elementList = new LinkedList<Object>();
>+        IModelDelta listDelta = delta;
>+        elementList.add(0, listDelta.getElement());
>+        while (listDelta.getParentDelta() != null) {
>+            elementList.add(0, listDelta.getElement());
>+            listDelta = listDelta.getParentDelta();
>+        }
>+        return new TreePath(elementList.toArray());
>+    }
>+
>+	@Override
>+	protected void updateElementsInSessionThread(IChildrenUpdate update) {
>+        doUpdateChildren(update);
>+	}
>+
>+    @Override
>+	public IDMVMContext createVMContext(IDMContext dmc) {
>+        return new RootDMVMContext(getVMProvider().getRootVMNode(), dmc);
>+    }
>+
>+    void setExpression(IExpressionDMContext dmc) {
>+		String text = dmc.getExpression();
>+		fManager.setExpression(new SimpleExpression(text));
>+    }
>+}
>Index: src/org/eclipse/cdt/dsf/debug/ui/ExpressionInformationControlCreator.java
>===================================================================
>RCS file: src/org/eclipse/cdt/dsf/debug/ui/ExpressionInformationControlCreator.java
>diff -N src/org/eclipse/cdt/dsf/debug/ui/ExpressionInformationControlCreator.java
>--- /dev/null	1 Jan 1970 00:00:00 -0000
>+++ src/org/eclipse/cdt/dsf/debug/ui/ExpressionInformationControlCreator.java	1 Jan 1970 00:00:00 -0000
>@@ -0,0 +1,447 @@
>+/*******************************************************************************
>+ * Copyright (c) 2008, 2009 IBM Corporation and others.
>+ * All rights reserved. This program and the accompanying materials
>+ * are made available under the terms of the Eclipse Public License v1.0
>+ * which accompanies this distribution, and is available at
>+ * http://www.eclipse.org/legal/epl-v10.html
>+ *
>+ * Contributors:
>+ *     IBM Corporation - initial API and implementation
>+ *     Wind River Systems - adapted for DSF
>+ *******************************************************************************/
>+package org.eclipse.cdt.dsf.debug.ui;
>+
>+import org.eclipse.cdt.dsf.debug.service.IExpressions.IExpressionDMContext;
>+import org.eclipse.cdt.dsf.internal.ui.DsfUIPlugin;
>+import org.eclipse.core.runtime.CoreException;
>+import org.eclipse.debug.core.model.IVariable;
>+import org.eclipse.debug.internal.ui.SWTFactory;
>+import org.eclipse.debug.internal.ui.model.elements.ElementContentProvider;
>+import org.eclipse.debug.internal.ui.viewers.model.provisional.IChildrenUpdate;
>+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.debug.internal.ui.viewers.model.provisional.IViewerUpdate;
>+import org.eclipse.debug.internal.ui.viewers.model.provisional.IViewerUpdateListener;
>+import org.eclipse.debug.internal.ui.viewers.model.provisional.PresentationContext;
>+import org.eclipse.debug.internal.ui.viewers.model.provisional.TreeModelViewer;
>+import org.eclipse.debug.internal.ui.viewers.model.provisional.ViewerInputService;
>+import org.eclipse.debug.internal.ui.views.variables.details.DefaultDetailPane;
>+import org.eclipse.debug.internal.ui.views.variables.details.DetailPaneProxy;
>+import org.eclipse.debug.internal.ui.views.variables.details.IDetailPaneContainer;
>+import org.eclipse.debug.ui.AbstractDebugView;
>+import org.eclipse.debug.ui.IDebugUIConstants;
>+import org.eclipse.jface.dialogs.IDialogSettings;
>+import org.eclipse.jface.text.AbstractInformationControl;
>+import org.eclipse.jface.text.IInformationControl;
>+import org.eclipse.jface.text.IInformationControlCreator;
>+import org.eclipse.jface.text.IInformationControlExtension2;
>+import org.eclipse.jface.viewers.IStructuredSelection;
>+import org.eclipse.jface.viewers.StructuredViewer;
>+import org.eclipse.jface.viewers.TreeSelection;
>+import org.eclipse.jface.viewers.ViewerFilter;
>+import org.eclipse.swt.SWT;
>+import org.eclipse.swt.custom.SashForm;
>+import org.eclipse.swt.events.SelectionEvent;
>+import org.eclipse.swt.events.SelectionListener;
>+import org.eclipse.swt.graphics.Color;
>+import org.eclipse.swt.graphics.Point;
>+import org.eclipse.swt.layout.GridData;
>+import org.eclipse.swt.layout.GridLayout;
>+import org.eclipse.swt.widgets.Composite;
>+import org.eclipse.swt.widgets.Layout;
>+import org.eclipse.swt.widgets.Shell;
>+import org.eclipse.swt.widgets.Tree;
>+import org.eclipse.ui.IWorkbenchPage;
>+import org.eclipse.ui.IWorkbenchPartSite;
>+
>+/**
>+ * Creates an information control to display an expression in a hover control.
>+ * 
>+ * @noextend This class is not intended to be subclassed by clients.
>+ * 
>+ * @since 2.1
>+ */
>+public class ExpressionInformationControlCreator implements IInformationControlCreator {
>+
>+	class ExpressionInformationControl extends AbstractInformationControl implements IInformationControlExtension2, IViewerInputRequestor {
>+
>+		/**
>+		 * Dialog setting key for height
>+		 */
>+		private static final String HEIGHT = "HEIGHT"; //$NON-NLS-1$
>+
>+		/**
>+		 * Dialog setting key for width. 
>+		 */
>+		private static final String WIDTH = "WIDTH"; //$NON-NLS-1$
>+
>+		/**
>+		 * Dialog setting key for tree sash weight
>+		 */
>+		private static final String SASH_WEIGHT_TREE = "SashWeightTree"; //$NON-NLS-1$
>+		
>+		/**
>+		 * Dialog setting key for details sash weight
>+		 */
>+		private static final String SASH_WEIGHT_DETAILS = "SashWeightDetails"; //$NON-NLS-1$		
>+		
>+		/**
>+		 * Variable to display.
>+		 */
>+		private Object fVariable;
>+		
>+	    private TreeModelViewer fViewer;
>+	    private SashForm fSashForm;
>+	    private Composite fDetailPaneComposite;
>+	    private DetailPaneProxy fDetailPane;
>+	    private Tree fTree;
>+
>+		private ViewerInputService fInputService;
>+		    
>+		/**
>+	     * Creates the content for the root element of the tree viewer in the hover
>+	     */
>+	    private class TreeRoot extends ElementContentProvider {
>+			@Override
>+			protected int getChildCount(Object element, IPresentationContext context, IViewerUpdate monitor) throws CoreException {
>+				return 1;
>+			}
>+			@Override
>+			protected Object[] getChildren(Object parent, int index, int length, IPresentationContext context, IViewerUpdate monitor) throws CoreException {
>+				return new Object[] { fVariable };
>+			}
>+			@Override
>+			protected boolean supportsContextId(String id) {
>+				return true;
>+			}
>+	    }
>+	    
>+		/**
>+		 * Inner class implementing IDetailPaneContainer methods.  Handles changes to detail
>+		 * pane and provides limited access to the detail pane proxy.
>+		 */
>+		private class DetailPaneContainer implements IDetailPaneContainer {
>+		
>+			/*
>+			 * @see org.eclipse.debug.internal.ui.views.variables.details.IDetailPaneContainer#getCurrentPaneID()
>+			 */
>+			public String getCurrentPaneID() {
>+				return fDetailPane.getCurrentPaneID();
>+			}
>+		
>+			/*
>+			 * @see org.eclipse.debug.internal.ui.views.variables.details.IDetailPaneContainer#getCurrentSelection()
>+			 */
>+			public IStructuredSelection getCurrentSelection() {
>+				return (IStructuredSelection)fViewer.getSelection();
>+			}
>+		
>+			/*
>+			 * @see org.eclipse.debug.internal.ui.views.variables.details.IDetailPaneContainer#refreshDetailPaneContents()
>+			 */
>+			public void refreshDetailPaneContents() {		
>+				fDetailPane.display(getCurrentSelection());
>+			}
>+		
>+			/*
>+			 * @see org.eclipse.debug.internal.ui.views.variables.details.IDetailPaneContainer#getParentComposite()
>+			 */
>+			public Composite getParentComposite() {
>+				return fDetailPaneComposite;
>+			}
>+		
>+			/*
>+			 * @see org.eclipse.debug.internal.ui.views.variables.details.IDetailPaneContainer#getWorkbenchPartSite()
>+			 */
>+			public IWorkbenchPartSite getWorkbenchPartSite() {
>+				return null;
>+			}
>+		
>+			/*
>+			 * @see org.eclipse.debug.internal.ui.views.variables.details.IDetailPaneContainer#paneChanged(java.lang.String)
>+			 */
>+			public void paneChanged(String newPaneID) {
>+				if (DefaultDetailPane.ID.equals(newPaneID)){
>+					fDetailPane.getCurrentControl().setBackground(getShell().getDisplay().getSystemColor(SWT.COLOR_INFO_BACKGROUND));
>+				}
>+			}
>+		
>+		}	    
>+
>+		/**
>+		 * Constructs a new control in the given shell.
>+		 * 
>+		 * @param parentShell shell
>+		 * @param resize whether resize is supported
>+		 */
>+		ExpressionInformationControl(Shell parentShell, boolean resize) {
>+			super(parentShell, resize);
>+			create();
>+		}
>+		
>+		@Override
>+		public Point computeSizeHint() {
>+			IDialogSettings settings = getDialogSettings(false);
>+			if (settings != null) {
>+				int x = getIntSetting(settings, WIDTH);
>+				if (x > 0) {
>+					int y = getIntSetting(settings, HEIGHT);
>+					if (y > 0) {
>+						final Point size= new Point(x,y);
>+						return size;
>+					}
>+				}
>+			}
>+			return super.computeSizeHint();
>+		}
>+
>+		/**
>+		 * Returns the dialog settings for this hover or <code>null</code> if none
>+		 * 
>+		 * @param create whether to create the settings
>+		 */
>+		private IDialogSettings getDialogSettings(boolean create) {
>+			IDialogSettings settings = DsfUIPlugin.getDefault().getDialogSettings();
>+			IDialogSettings section = settings.getSection(this.getClass().getName());
>+			if (section == null & create) {
>+				section = settings.addNewSection(this.getClass().getName());
>+			}
>+			return section;
>+		}
>+		
>+		/**
>+		 * Returns an integer value in the given dialog settings or -1 if none.
>+		 * 
>+		 * @param settings dialog settings
>+		 * @param key key
>+		 * @return value or -1 if not present
>+		 */
>+		private int getIntSetting(IDialogSettings settings, String key) {
>+			try {
>+				return settings.getInt(key);
>+			} catch (NumberFormatException e) {
>+				return -1;
>+			}
>+		}
>+		
>+		@Override
>+		public void dispose() {
>+			persistSettings(getShell());
>+			super.dispose();
>+		}
>+
>+		/**
>+		 * Persists dialog settings.
>+		 * 
>+		 * @param shell
>+		 */
>+		private void persistSettings(Shell shell) {
>+			if (shell != null && !shell.isDisposed()) {
>+				if (isResizable()) {
>+					IDialogSettings settings = getDialogSettings(true);
>+					Point size = shell.getSize();
>+					System.out.println("ExpressionInformationControlCreator.ExpressionInformationControl.persistSettings() " + size);
>+					settings.put(WIDTH, size.x);
>+					settings.put(HEIGHT, size.y);
>+					int[] weights = fSashForm.getWeights();
>+					settings.put(SASH_WEIGHT_TREE, weights[0]);
>+					settings.put(SASH_WEIGHT_DETAILS, weights[1]);
>+				}
>+			}
>+		}
>+		
>+		@Override
>+		public void setVisible(boolean visible) {
>+			if (!visible) {		
>+				persistSettings(getShell());
>+			}
>+			super.setVisible(visible);
>+		}
>+
>+		@Override
>+		protected void createContent(Composite parent) {
>+
>+	        fSashForm = new SashForm(parent, parent.getStyle());
>+	        fSashForm.setOrientation(SWT.VERTICAL);
>+
>+		    // update presentation context
>+	        AbstractDebugView view = getViewToEmulate();
>+	        IPresentationContext context = new PresentationContext(IDsfDebugUIConstants.ID_EXPRESSION_HOVER);
>+	        if (view != null) {
>+	        	// copy over properties
>+	        	IPresentationContext copy = ((TreeModelViewer)view.getViewer()).getPresentationContext();
>+	        	try {
>+		        	String[] properties = copy.getProperties();
>+		        	for (int i = 0; i < properties.length; i++) {
>+						String key = properties[i];
>+						context.setProperty(key, copy.getProperty(key));
>+					}
>+	        	} catch (NoSuchMethodError e) {
>+	        		// ignore
>+	        	}
>+	        }
>+	       
>+	        fViewer = new TreeModelViewer(fSashForm, SWT.NO_TRIM | SWT.MULTI | SWT.VIRTUAL, context);
>+	        fViewer.setAutoExpandLevel(1);
>+	        
>+	        if (view != null) {
>+	        	// copy over filters
>+	        	StructuredViewer structuredViewer = (StructuredViewer) view.getViewer();
>+	            if (structuredViewer != null) {
>+	                ViewerFilter[] filters = structuredViewer.getFilters();
>+	                for (int i = 0; i < filters.length; i++) {
>+	                    fViewer.addFilter(filters[i]);
>+	                }
>+	            }
>+	        }
>+	        fInputService = new ViewerInputService(fViewer, this);
>+	        
>+	        fDetailPaneComposite = SWTFactory.createComposite(fSashForm, 1, 1, GridData.FILL_BOTH);
>+	        Layout layout = fDetailPaneComposite.getLayout();
>+	        if (layout instanceof GridLayout) {
>+				GridLayout gl = (GridLayout) layout;
>+				gl.marginHeight = 0;
>+				gl.marginWidth = 0;
>+			}
>+	        
>+	        fDetailPane = new DetailPaneProxy(new DetailPaneContainer());
>+	        fDetailPane.display(null); // Bring up the default pane so the user doesn't see an empty composite
>+	      
>+	        fTree = fViewer.getTree();
>+	        fTree.addSelectionListener(new SelectionListener() {
>+	            public void widgetSelected(SelectionEvent e) {
>+	            	fDetailPane.display((IStructuredSelection)fViewer.getSelection());
>+	            }
>+	            public void widgetDefaultSelected(SelectionEvent e) {}
>+	        });
>+
>+	        initSashWeights();
>+	        
>+	        // add update listener to auto-select and display details of root expression
>+	        fViewer.addViewerUpdateListener(new IViewerUpdateListener() {
>+				public void viewerUpdatesComplete() {
>+				}
>+				public void viewerUpdatesBegin() {
>+				}
>+				public void updateStarted(IViewerUpdate update) {
>+				}
>+				public void updateComplete(IViewerUpdate update) {
>+					if (update instanceof IChildrenUpdate) {
>+						fViewer.removeViewerUpdateListener(this);
>+						fViewer.getDisplay().timerExec(100, new Runnable() {
>+							public void run() {
>+								TreeSelection selection = new TreeSelection(fViewer.getTopElementPath());
>+								fViewer.setSelection(selection);
>+								fDetailPane.display(selection);
>+							}});
>+					}
>+				}
>+			});        
>+	        
>+	        setBackgroundColor(getShell().getDisplay().getSystemColor(SWT.COLOR_INFO_BACKGROUND));
>+		}
>+		
>+
>+		/**
>+	     * Attempts to find an appropriate view to emulate, this will either be the
>+	     * variables view or the expressions view.
>+	     * @return a view to emulate or <code>null</code>
>+	     */
>+	    private AbstractDebugView getViewToEmulate() {
>+	        IWorkbenchPage page = DsfUIPlugin.getDefault().getWorkbench().getActiveWorkbenchWindow().getActivePage();
>+	        AbstractDebugView expressionsView = (AbstractDebugView) page.findView(IDebugUIConstants.ID_EXPRESSION_VIEW);
>+	        if (expressionsView != null && expressionsView.isVisible()) {
>+	            return expressionsView;
>+	        }
>+	        AbstractDebugView variablesView = (AbstractDebugView) page.findView(IDebugUIConstants.ID_VARIABLE_VIEW);
>+	        if (variablesView != null && variablesView.isVisible()) {
>+	            return variablesView;
>+	        }
>+	        if (expressionsView != null) {
>+	            return expressionsView;
>+	        }
>+	        return variablesView;
>+	    }	
>+
>+		/**
>+	     * Initializes the sash form weights from the preference store (using default values if 
>+	     * no sash weights were stored previously).
>+	     */
>+	    protected void initSashWeights(){
>+	    	IDialogSettings settings = getDialogSettings(false);
>+	    	if (settings != null) {
>+		    	int tree = getIntSetting(settings, SASH_WEIGHT_TREE);
>+		    	if (tree > 0) {
>+		    		int details = getIntSetting(settings, SASH_WEIGHT_DETAILS);
>+		    		if (details > 0) {
>+		    			fSashForm.setWeights(new int[]{tree, details});
>+		    		}
>+		    	}
>+	    	}
>+	    }
>+	    		
>+		/* (non-Javadoc)
>+		 * @see org.eclipse.jface.text.AbstractInformationControl#setBackgroundColor(org.eclipse.swt.graphics.Color)
>+		 */
>+		@Override
>+		public void setBackgroundColor(Color background) {
>+			super.setBackgroundColor(background);
>+			fDetailPaneComposite.setBackground(background);
>+			fTree.setBackground(background);
>+		}
>+	
>+		/* (non-Javadoc)
>+		 * @see org.eclipse.jface.text.AbstractInformationControl#setFocus()
>+		 */
>+		@Override
>+		public void setFocus() {
>+			super.setFocus();
>+			fTree.setFocus();
>+		}
>+		
>+		/* (non-Javadoc)
>+		 * @see org.eclipse.jface.text.IInformationControlExtension#hasContents()
>+		 */
>+		public boolean hasContents() {
>+			return fVariable != null;
>+		}
>+
>+		/* (non-Javadoc)
>+		 * @see org.eclipse.jface.text.IInformationControlExtension2#setInput(java.lang.Object)
>+		 */
>+		public void setInput(Object input) {
>+			if (input instanceof IExpressionDMContext) {
>+				fVariable = input;
>+				fInputService.resolveViewerInput(input);
>+			} else if (input instanceof IVariable) {
>+				fVariable = input;
>+		        fViewer.setInput(new TreeRoot());
>+			}
>+		}
>+
>+		@Override
>+		public IInformationControlCreator getInformationPresenterControlCreator() {
>+			return new ExpressionInformationControlCreator() {
>+				@Override
>+				public IInformationControl createInformationControl(Shell shell) {
>+					return new ExpressionInformationControl(shell, true);
>+				}
>+			};
>+		}
>+
>+		public void viewerInputComplete(IViewerInputUpdate update) {
>+			fViewer.setInput(fVariable = update.getInputElement());
>+		}
>+
>+	}
>+
>+	/*
>+	 * @see org.eclipse.jface.text.IInformationControlCreator#createInformationControl(org.eclipse.swt.widgets.Shell)
>+	 */
>+	public IInformationControl createInformationControl(Shell parent) {
>+		return new ExpressionInformationControl(parent, false);
>+	}
>+
>+
>+}

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Attachments on bug 255026: 151809 | 154482 | 159709