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Java > Open Source Codes > org > eclipse > pde > internal > ui > view > HistoryDropDownAction


1 /*******************************************************************************
2  * Copyright (c) 2000, 2006 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.pde.internal.ui.view;
12
13 import org.eclipse.jface.action.Action;
14 import org.eclipse.jface.action.ActionContributionItem;
15 import org.eclipse.jface.action.IMenuCreator;
16 import org.eclipse.pde.internal.ui.PDEPluginImages;
17 import org.eclipse.pde.internal.ui.PDEUIMessages;
18 import org.eclipse.swt.SWT;
19 import org.eclipse.swt.widgets.Control;
20 import org.eclipse.swt.widgets.Menu;
21 import org.eclipse.swt.widgets.MenuItem;
22
23 public class HistoryDropDownAction extends Action implements IMenuCreator {
24
25     public static final int RESULTS_IN_DROP_DOWN = 10;
26
27     private Menu fMenu;
28
29     private DependenciesView fView;
30
31     public HistoryDropDownAction(DependenciesView view) {
32         fView = view;
33         fMenu = null;
34         setToolTipText(PDEUIMessages.HistoryDropDownAction_tooltip);
35         setImageDescriptor(PDEPluginImages.DESC_HISTORY_LIST);
36         setDisabledImageDescriptor(PDEPluginImages.DESC_HISTORY_LIST_DISABLED);
37         setMenuCreator(this);
38     }
39
40     protected void addActionToMenu(Menu parent, Action action) {
41         ActionContributionItem item = new ActionContributionItem(action);
42         item.fill(parent, -1);
43     }
44
45     private boolean addEntries(Menu menu, String JavaDoc[] elements) {
46         boolean checked = false;
47
48         int min = Math.min(elements.length, RESULTS_IN_DROP_DOWN);
49         for (int i = 0; i < min; i++) {
50             HistoryAction action = new HistoryAction(fView, elements[i]);
51             action.setChecked(elements[i].equals(fView.getInput()));
52             checked = checked || action.isChecked();
53             addActionToMenu(menu, action);
54         }
55         return checked;
56     }
57
58     public void dispose() {
59         // action is reused, can be called several times.
60 if (fMenu != null) {
61             fMenu.dispose();
62             fMenu = null;
63         }
64     }
65
66     public Menu getMenu(Control parent) {
67         if (fMenu != null) {
68             fMenu.dispose();
69         }
70         fMenu = new Menu(parent);
71         String JavaDoc[] elements = fView.getHistoryEntries();
72         boolean checked = addEntries(fMenu, elements);
73         if (elements.length > RESULTS_IN_DROP_DOWN) {
74             new MenuItem(fMenu, SWT.SEPARATOR);
75             Action others = new HistoryListAction(fView);
76             others.setChecked(checked);
77             addActionToMenu(fMenu, others);
78         }
79         return fMenu;
80     }
81
82     public Menu getMenu(Menu parent) {
83         return null;
84     }
85
86     public void run() {
87         (new HistoryListAction(fView)).run();
88     }
89 }
90
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