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Java > Open Source Codes > org > eclipse > ui > internal > actions > PinEditorContributionItem


1 /*******************************************************************************
2  * Copyright (c) 2003, 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 package org.eclipse.ui.internal.actions;
12
13 import org.eclipse.jface.action.ActionContributionItem;
14 import org.eclipse.jface.preference.IPreferenceStore;
15 import org.eclipse.jface.util.IPropertyChangeListener;
16 import org.eclipse.jface.util.PropertyChangeEvent;
17 import org.eclipse.ui.IWorkbenchWindow;
18 import org.eclipse.ui.internal.IPreferenceConstants;
19 import org.eclipse.ui.internal.PinEditorAction;
20 import org.eclipse.ui.internal.WorkbenchPlugin;
21 import org.eclipse.ui.internal.tweaklets.TabBehaviour;
22 import org.eclipse.ui.internal.tweaklets.Tweaklets;
23
24 /**
25  * This contribution item controls the visibility of the pin editor
26  * action based on the current preference value for reusing editors.
27  *
28  * @since 3.0
29  */
30 public class PinEditorContributionItem extends ActionContributionItem {
31     private IWorkbenchWindow window = null;
32
33     private boolean reuseEditors = false;
34
35     private IPropertyChangeListener prefListener = new IPropertyChangeListener() {
36         public void propertyChange(PropertyChangeEvent event) {
37             if (event.getProperty().equals(
38                     IPreferenceConstants.REUSE_EDITORS_BOOLEAN)) {
39                 if (getParent() != null) {
40                     IPreferenceStore store = WorkbenchPlugin.getDefault()
41                             .getPreferenceStore();
42                     reuseEditors = store
43                             .getBoolean(IPreferenceConstants.REUSE_EDITORS_BOOLEAN)
44                             || ((TabBehaviour)Tweaklets.get(TabBehaviour.KEY)).alwaysShowPinAction();
45                     setVisible(reuseEditors);
46                     getParent().markDirty();
47                     if (window.getShell() != null
48                             && !window.getShell().isDisposed()) {
49                         // this property change notification could be from a non-ui thread
50 window.getShell().getDisplay().syncExec(new Runnable JavaDoc() {
51                             public void run() {
52                                 getParent().update(false);
53                             }
54                         });
55                     }
56                 }
57             }
58         }
59     };
60
61     /**
62      * @param action
63      */
64     public PinEditorContributionItem(PinEditorAction action,
65             IWorkbenchWindow window) {
66         super(action);
67
68         if (window == null) {
69             throw new IllegalArgumentException JavaDoc();
70         }
71         this.window = window;
72
73         IPreferenceStore store = WorkbenchPlugin.getDefault().getPreferenceStore();
74         reuseEditors = store
75                 .getBoolean(IPreferenceConstants.REUSE_EDITORS_BOOLEAN)
76                 || ((TabBehaviour)Tweaklets.get(TabBehaviour.KEY)).alwaysShowPinAction();
77         setVisible(reuseEditors);
78         WorkbenchPlugin.getDefault().getPreferenceStore()
79                 .addPropertyChangeListener(prefListener);
80     }
81
82     /* (non-Javadoc)
83      * @see org.eclipse.jface.action.IContributionItem#isVisible()
84      */
85     public boolean isVisible() {
86         // @issue the ActionContributionItem implementation of this method ignores the "visible" value set
87 return super.isVisible() && reuseEditors;
88     }
89
90     /* (non-Javadoc)
91      * @see org.eclipse.jface.action.IContributionItem#dispose()
92      */
93     public void dispose() {
94         super.dispose();
95         WorkbenchPlugin.getDefault().getPreferenceStore()
96                 .removePropertyChangeListener(prefListener);
97     }
98 }
99
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