Bug - 326307

Initial version with dropdown expressions list.

Also this code contains fixes for 330468. I had these edits in place when I started working with Alain's patch.

Randy
781-354-2226

memory/org.eclipse.cdt.debug.ui.memory.memorybrowser/plugin.properties

@@ -13,7 +13,7 @@
 providerName = Eclipse CDT
 pluginName = Memory Browser
 view.name.0 = Memory Browser
-
+view.clearExpressionList = Clear Expressions
 # Pin & Clone
 PinView.name = Pin to Debug Context
 OpenNewView.name = Open New View

memory/org.eclipse.cdt.debug.ui.memory.memorybrowser/plugin.xml

@@ -10,6 +10,7 @@
 # Contributors:
 # Ted R Williams (Wind River) - initial implementation 
 # Patrick Chuong (Texas Instruments) - Pin and Clone Supports (331781)
+# Randy Rohrbach (Wind River) - Multiple expression support (326307)
 -->
 <plugin>
 
@@ -59,4 +60,19 @@
          </action>
       </viewContribution>
    </extension>
+   <!-- Add the ability to clear the expressions list -->
+   <extension point="org.eclipse.ui.viewActions">
+     <viewContribution
+       id="org.eclipse.cdt.debug.ui.memory.memorybrowser.MemoryBrowser.clearExpressionList"
+       targetID="org.eclipse.cdt.debug.ui.memory.memorybrowser.MemoryBrowser">
+       <action
+          class="org.eclipse.cdt.debug.ui.memory.memorybrowser.ClearExpressionsListAction"
+          id="org.eclipse.cdt.debug.ui.memory.memorybrowser.ClearExpressionListActionID"
+          label="%view.clearExpressionList"
+          menubarPath="additions">
+       </action>
+     </viewContribution>
+   </extension>
+   
+   
 </plugin>

memory/org.eclipse.cdt.debug.ui.memory.memorybrowser/src/org/eclipse/cdt/debug/ui/memory/memorybrowser/ClearExpressionsListAction.java

@@ -0,0 +1,35 @@
+/*******************************************************************************
+ * Copyright (c) 2007-2009 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:
+ *     Ted R Williams (Wind River Systems, Inc.) - initial implementation
+ *******************************************************************************/
+
+package org.eclipse.cdt.debug.ui.memory.memorybrowser;
+
+import org.eclipse.jface.action.IAction;
+import org.eclipse.jface.viewers.ISelection;
+import org.eclipse.ui.IViewActionDelegate;
+import org.eclipse.ui.IViewPart;
+
+public class ClearExpressionsListAction implements IViewActionDelegate {
+
+	private IViewPart fView;
+	
+	public void init(IViewPart view) {
+		fView = view;
+	}
+
+	public void run(IAction action) {
+		if ( fView instanceof MemoryBrowser ) {
+			MemoryBrowser browser = (MemoryBrowser) fView;
+			browser.clearExpressionsFromList(null);
+		}
+	}
+
+	public void selectionChanged(IAction action, ISelection selection) {}
+}

memory/org.eclipse.cdt.debug.ui.memory.memorybrowser/src/org/eclipse/cdt/debug/ui/memory/memorybrowser/GoToAddressBarWidget.java

@@ -11,25 +11,30 @@
 
 package org.eclipse.cdt.debug.ui.memory.memorybrowser;
 
+import java.util.ArrayList;
+import java.util.StringTokenizer;
+
 import org.eclipse.core.runtime.IStatus;
+import org.eclipse.core.runtime.Status;
 import org.eclipse.jface.dialogs.IDialogConstants;
 import org.eclipse.jface.fieldassist.ControlDecoration;
 import org.eclipse.jface.fieldassist.FieldDecoration;
 import org.eclipse.jface.fieldassist.FieldDecorationRegistry;
+import org.eclipse.jface.preference.IPreferenceStore;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.events.ModifyEvent;
 import org.eclipse.swt.events.ModifyListener;
 import org.eclipse.swt.layout.GridData;
 import org.eclipse.swt.layout.GridLayout;
 import org.eclipse.swt.widgets.Button;
+import org.eclipse.swt.widgets.Combo;
 import org.eclipse.swt.widgets.Composite;
 import org.eclipse.swt.widgets.Control;
-import org.eclipse.swt.widgets.Text;
 import org.eclipse.ui.PlatformUI;
 
 public class GoToAddressBarWidget {
 	
-	private Text fExpression;
+	private Combo fExpression;
 	private ControlDecoration fEmptyExpression;
 	private ControlDecoration fWrongExpression;
 	
@@ -38,8 +43,10 @@ public class GoToAddressBarWidget {
 	private Composite fComposite;
 	
 	protected static int ID_GO_NEW_TAB = 2000;
-
-	/**
+	
+	private IStatus fExpressionStatus = Status.OK_STATUS;
+	
+    /**
 	 * @param parent
 	 * @return
 	 */
@@ -68,20 +75,142 @@ public class GoToAddressBarWidget {
 		
 		return fComposite;
 	}
+	
+	private final static String SAVED_EXPRESSIONS = "saved_expressions";  //$NON-NLS-1$
+	private final static int MAX_SAVED_EXPRESSIONS = 30 ;
+	
+	private void saveExpression( String memorySpace, String expr ) {
+		/*
+		 * Get the saved expressions if any.
+		 * 
+		 * They are in the form
+		 * 
+		 *     expression,expression,.....,expression
+		 */
+		IPreferenceStore store = MemoryBrowserPlugin.getDefault().getPreferenceStore();
+		String currentExpressions = store.getString(SAVED_EXPRESSIONS);
+		if ( currentExpressions != null && currentExpressions.length() != 0 ) {
+			store.setValue(SAVED_EXPRESSIONS, currentExpressions + ","  + expr);
+		}
+		else {
+			store.setValue(SAVED_EXPRESSIONS, expr);
+		}
+	}
+	
+	public void deleteExpressions(String memorySpace) {
+		MemoryBrowserPlugin.getDefault().getPreferenceStore().setValue(SAVED_EXPRESSIONS, "");
+	}
 
-	private Text createExpressionField(Composite parent) {
-		Text expression = new Text(parent, SWT.SINGLE | SWT.BORDER);
-		expression.addModifyListener(new ModifyListener() {
+	private String[] getSavedExpressions(String memorySpace) {
+		/*
+		 * Get the saved expressions if any.
+		 * 
+		 * They are in the form
+		 * 
+		 *     expression,expression,.....,expression
+		 */
+		IPreferenceStore store = MemoryBrowserPlugin.getDefault().getPreferenceStore();
+		String expressions = store.getString(SAVED_EXPRESSIONS);
+		
+		StringTokenizer st = new StringTokenizer(expressions, ","); //$NON-NLS-1$
+		/*
+		 * Parse through the list creating an ordered array for display.
+		 */
+		ArrayList<String> list = new ArrayList<String>();
+		while(st.hasMoreElements())
+		{
+			String expr = (String) st.nextElement();
+			list.add(expr);
+		}
+		return list.toArray(new String[list.size()]);
+	}
+	
+	private String removeOldestExpression( String memorySpace ) {
+		String[] currentSavedExpressions = getSavedExpressions(memorySpace);
+		if ( currentSavedExpressions.length > 0 ) {
+			/*
+			 * Remove all expressions and then repopulate the list.
+			 */
+			deleteExpressions(memorySpace);
+			/*
+			 * The first in the list is the oldest. So we will delete it by not
+			 * putting it back.
+			 */
+			for ( int idx = 1 ; idx < currentSavedExpressions.length; idx ++ ) {
+				saveExpression( memorySpace, currentSavedExpressions[idx]);
+			}
+			return currentSavedExpressions[0];
+		}
+		return null;
+	}
+	
+	public void addExpressionToList( String memorySpace, String expr ) {
+		/*
+		 * Make sure it does not already exist, we do not want to show duplicates.
+		 */
+		if ( fExpression.indexOf(expr) == -1 ) {
+			/*
+			 * Cap the size of the list.
+			 */
+			if ( ( fExpression.getItemCount() + 1 ) > MAX_SAVED_EXPRESSIONS ) {
+				fExpression.remove(removeOldestExpression(memorySpace));
+			}
+			
+			/*
+			 * Add the new expression to the dropdown.
+			 */
+			fExpression.add(expr);
+			
+			/*
+			 * Add it to the persistense database.
+			 */
+			saveExpression(memorySpace, expr);
+		}
+	}
+	
+	public void clearExpressionsFromList(String memorySpace) {
+		/*
+		 * Clean up the combo list.
+		 */
+		fExpression.removeAll();
+		fExpression.computeSize(SWT.DEFAULT, SWT.DEFAULT, true);
+		
+		/*
+		 * Clean out the expression persistense.
+		 */
+		deleteExpressions(memorySpace);
+		
+		/*
+		 * Make sure the status image indicator shows OK.
+		 */
+		handleExpressionStatus(Status.OK_STATUS);
+	}
+	
+	private Combo createExpressionField(Composite parent){
+		/*
+		 * Create the dropdown box for the editable expressions.
+		 */
+		Combo combo = new Combo(parent, SWT.DROP_DOWN | SWT.BORDER);
+		combo.addModifyListener(new ModifyListener() {
 			public void modifyText(ModifyEvent e) {
 				updateButtons();
 			}
 		});
-		fEmptyExpression = new ControlDecoration(expression, SWT.LEFT | SWT.CENTER);
+		
+		/*
+		 * Populate the list with the expressions from the last time the view was brought up.
+		 */
+		String[] expressions = getSavedExpressions("");
+		for ( String expr : expressions ) {
+			combo.add( expr );
+		}
+		
+		fEmptyExpression = new ControlDecoration(combo, SWT.LEFT | SWT.CENTER);
 		fEmptyExpression.setDescriptionText(Messages.getString("GoToAddressBarWidget.EnterExpressionMessage")); //$NON-NLS-1$
 		FieldDecoration fieldDec = FieldDecorationRegistry.getDefault().getFieldDecoration(FieldDecorationRegistry.DEC_REQUIRED);
 		fEmptyExpression.setImage(fieldDec.getImage());
 
-		fWrongExpression = new ControlDecoration(expression, SWT.LEFT | SWT.TOP);
+		fWrongExpression = new ControlDecoration(combo, SWT.LEFT | SWT.TOP);
 		fieldDec = FieldDecorationRegistry.getDefault().getFieldDecoration(FieldDecorationRegistry.DEC_ERROR);
 		fWrongExpression.setImage(fieldDec.getImage());
 		fWrongExpression.hide();
@@ -89,8 +218,8 @@ public class GoToAddressBarWidget {
 		// leave enough room for decorators
 		GridData data = new GridData(GridData.FILL_HORIZONTAL);
 		data.horizontalIndent = Math.max(fEmptyExpression.getImage().getBounds().width, fWrongExpression.getImage().getBounds().width);
-		expression.setLayoutData(data);
-		return expression;
+		combo.setLayoutData(data);
+		return combo;
 	}
 		
 	protected void updateButtons() {
@@ -103,8 +232,11 @@ public class GoToAddressBarWidget {
 			fEmptyExpression.show();
 		else 
 			fEmptyExpression.hide();
-
-		fWrongExpression.hide();
+		
+		if (fExpressionStatus.isOK())
+		    fWrongExpression.hide();
+		else
+		    fWrongExpression.show();
 	}
 
 	public int getHeight()
@@ -140,7 +272,7 @@ public class GoToAddressBarWidget {
 		fExpression.setText(text);
 	}
 
-	public Text getExpressionWidget()
+	public Combo getExpressionWidget()
 	{
 		return fExpression;
 	}
@@ -156,5 +288,16 @@ public class GoToAddressBarWidget {
 			fWrongExpression.setDescriptionText(message.getMessage());
 			fWrongExpression.show();
 		}
+		
+		fExpressionStatus = message;
 	}
-}
+	
+	/**
+	 * Return the expression status
+	 * @return expression status
+	 */
+	public IStatus getExpressionStatus()
+    {
+        return fExpressionStatus;
+    }
+}

memory/org.eclipse.cdt.debug.ui.memory.memorybrowser/src/org/eclipse/cdt/debug/ui/memory/memorybrowser/MemoryBrowser.java

@@ -320,6 +320,10 @@ public class MemoryBrowser extends ViewPart implements IDebugContextListener, IM
         return false;
     }
 	
+    public void clearExpressionsFromList(String memorySpace) {
+    	fGotoAddressBar.clearExpressionsFromList(memorySpace);
+    }
+    
 	/**
      * Returns the presentation context id for this view.  Used to support the 
      * pin and clone feature patch from bug 145635. 
@@ -393,7 +397,8 @@ public class MemoryBrowser extends ViewPart implements IDebugContextListener, IM
 		
 		String expression = fGotoAddressBar.getExpressionText();
 		if (expression.length() > 0) {
-			performGo(inNewTab, fGotoAddressBar.getExpressionText(), memorySpace);	
+			fGotoAddressBar.addExpressionToList(memorySpace, expression);
+			performGo(inNewTab, expression, memorySpace);	
 		}
 	}