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Java > Open Source Codes > org > eclipse > ui > internal > ShowPartPaneMenuHandler


1 /*******************************************************************************
2  * Copyright (c) 2007 IBM Corporation and others.
3  * All rights reserved. This program and the accompanying materials
4  * are made available under the terms of the Eclipse Public License v1.0
5  * which accompanies this distribution, and is available at
6  * http://www.eclipse.org/legal/epl-v10.html
7  *
8  * Contributors:
9  * IBM Corporation - initial API and implementation
10  ******************************************************************************/
11
12 package org.eclipse.ui.internal;
13
14 import org.eclipse.core.commands.ExecutionEvent;
15 import org.eclipse.core.commands.ExecutionException;
16 import org.eclipse.core.expressions.EvaluationResult;
17 import org.eclipse.core.expressions.Expression;
18 import org.eclipse.core.expressions.ExpressionInfo;
19 import org.eclipse.core.expressions.IEvaluationContext;
20 import org.eclipse.core.runtime.CoreException;
21 import org.eclipse.ui.ISources;
22 import org.eclipse.ui.IWorkbenchPart;
23 import org.eclipse.ui.IWorkbenchPartSite;
24 import org.eclipse.ui.handlers.HandlerUtil;
25
26 /**
27  * Show the menu on top of the icon in the view or editor label.
28  * <p>
29  * Replacement for ShowPartPaneMenuAction
30  * </p>
31  *
32  * @since 3.3
33  */
34 public class ShowPartPaneMenuHandler extends AbstractEvaluationHandler {
35
36     private Expression enabledWhen;
37
38     public ShowPartPaneMenuHandler() {
39         registerEnablement();
40     }
41
42     public Object JavaDoc execute(ExecutionEvent event) throws ExecutionException {
43
44         IWorkbenchPart part = HandlerUtil.getActivePart(event);
45         if (part != null) {
46             IWorkbenchPartSite site = part.getSite();
47             if (site instanceof PartSite) {
48                 PartPane pane = ((PartSite) site).getPane();
49                 pane.showSystemMenu();
50             }
51         }
52         return null;
53     }
54
55     /*
56      * (non-Javadoc)
57      *
58      * @see org.eclipse.ui.internal.AbstractEvaluationHandler#getEnabledWhenExpression()
59      */
60     protected Expression getEnabledWhenExpression() {
61         if (enabledWhen == null) {
62             enabledWhen = new Expression() {
63                 public EvaluationResult evaluate(IEvaluationContext context)
64                         throws CoreException {
65                     IWorkbenchPart part = InternalHandlerUtil
66                             .getActivePart(context);
67
68                     if (part != null) {
69                         return EvaluationResult.TRUE;
70                     }
71                     return EvaluationResult.FALSE;
72                 }
73
74                 /*
75                  * (non-Javadoc)
76                  *
77                  * @see org.eclipse.core.expressions.Expression#collectExpressionInfo(org.eclipse.core.expressions.ExpressionInfo)
78                  */
79                 public void collectExpressionInfo(ExpressionInfo info) {
80                     info.addVariableNameAccess(ISources.ACTIVE_PART_NAME);
81                 }
82             };
83         }
84         return enabledWhen;
85     }
86 }
87
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