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Java > Open Source Codes > org > eclipse > pde > internal > ui > parts > SharedPartWithButtons


1 /*******************************************************************************
2  * Copyright (c) 2000, 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.pde.internal.ui.parts;
12 import org.eclipse.swt.SWT;
13 import org.eclipse.swt.events.SelectionEvent;
14 import org.eclipse.swt.events.SelectionListener;
15 import org.eclipse.swt.layout.GridData;
16 import org.eclipse.swt.layout.GridLayout;
17 import org.eclipse.swt.widgets.Button;
18 import org.eclipse.swt.widgets.Composite;
19 import org.eclipse.ui.forms.widgets.FormToolkit;
20
21
22 public abstract class SharedPartWithButtons extends SharedPart {
23     private String JavaDoc[] fButtonLabels;
24     private Button[] fButtons;
25     protected Composite fButtonContainer;
26     private class SelectionHandler implements SelectionListener {
27         public void widgetSelected(SelectionEvent e) {
28             buttonSelected(e);
29         }
30         public void widgetDefaultSelected(SelectionEvent e) {
31             buttonSelected(e);
32         }
33         private void buttonSelected(SelectionEvent e) {
34             Integer JavaDoc index = (Integer JavaDoc) e.widget.getData();
35             SharedPartWithButtons.this.buttonSelected((Button) e.widget, index
36                     .intValue());
37         }
38     }
39     public SharedPartWithButtons(String JavaDoc[] buttonLabels) {
40         fButtonLabels = buttonLabels;
41     }
42     public void setButtonEnabled(int index, boolean enabled) {
43         if (fButtons != null && index >= 0 && fButtons.length > index) {
44             fButtons[index].setEnabled(enabled);
45         }
46     }
47     protected abstract void createMainControl(Composite parent, int style,
48             int span, FormToolkit toolkit);
49     protected abstract void buttonSelected(Button button, int index);
50     /*
51      * @see SharedPart#createControl(Composite, FormWidgetFactory)
52      */
53     public void createControl(Composite parent, int style, int span,
54             FormToolkit toolkit) {
55         createMainLabel(parent, span, toolkit);
56         createMainControl(parent, style, span - 1, toolkit);
57         createButtons(parent, toolkit);
58     }
59     protected void createButtons(Composite parent, FormToolkit toolkit) {
60         if (fButtonLabels != null && fButtonLabels.length > 0) {
61             fButtonContainer = createComposite(parent, toolkit);
62             GridData gd = new GridData(GridData.FILL_VERTICAL);
63             fButtonContainer.setLayoutData(gd);
64             fButtonContainer.setLayout(createButtonsLayout());
65             fButtons = new Button[fButtonLabels.length];
66             SelectionHandler listener = new SelectionHandler();
67             for (int i = 0; i < fButtonLabels.length; i++) {
68                 String JavaDoc label = fButtonLabels[i];
69                 if (label != null) {
70                     Button button = createButton(fButtonContainer, label, i,
71                             toolkit);
72                     button.addSelectionListener(listener);
73                     fButtons[i] = button;
74                 } else {
75                     createEmptySpace(fButtonContainer, 1, toolkit);
76                 }
77             }
78         }
79     }
80     protected GridLayout createButtonsLayout() {
81         GridLayout layout = new GridLayout();
82         layout.marginWidth = layout.marginHeight = 0;
83         return layout;
84     }
85     protected Button createButton(Composite parent, String JavaDoc label, int index,
86             FormToolkit toolkit) {
87         Button button;
88         if (toolkit != null)
89             button = toolkit.createButton(parent, label, SWT.PUSH);
90         else {
91             button = new Button(parent, SWT.PUSH);
92             button.setText(label);
93         }
94         GridData gd = new GridData(GridData.FILL_HORIZONTAL
95                 | GridData.VERTICAL_ALIGN_BEGINNING);
96         button.setLayoutData(gd);
97         button.setData(new Integer JavaDoc(index));
98         return button;
99     }
100     protected void updateEnabledState() {
101         for (int i = 0; i < fButtons.length; i++) {
102             fButtons[i].setEnabled(isEnabled());
103         }
104     }
105     protected void createMainLabel(Composite parent, int span,
106             FormToolkit toolkit) {
107     }
108     
109     /**
110      * @param index
111      * @return
112      */
113     public Button getButton(int index) {
114         //
115 if ((fButtons == null) ||
116                 (index < 0) ||
117                 (index >= fButtons.length)) {
118             return null;
119         }
120         //
121 return fButtons[index];
122     }
123 }
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