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1 | /******************************************************************************* |
2 | * Copyright (c) 2000, 2011 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.jdt.internal.ui.util; | |
12 | ||
13 | import org.eclipse.swt.SWT; | |
14 | import org.eclipse.swt.accessibility.ACC; | |
15 | import org.eclipse.swt.accessibility.AccessibleAdapter; | |
16 | import org.eclipse.swt.accessibility.AccessibleEvent; | |
17 | import org.eclipse.swt.dnd.DragSource; | |
18 | import org.eclipse.swt.dnd.DropTarget; | |
19 | import org.eclipse.swt.layout.GridData; | |
20 | import org.eclipse.swt.layout.GridLayout; | |
21 | import org.eclipse.swt.widgets.Button; | |
22 | import org.eclipse.swt.widgets.Caret; | |
23 | import org.eclipse.swt.widgets.Combo; | |
24 | import org.eclipse.swt.widgets.Control; | |
25 | import org.eclipse.swt.widgets.Menu; | |
26 | import org.eclipse.swt.widgets.ScrollBar; | |
27 | import org.eclipse.swt.widgets.Shell; | |
28 | import org.eclipse.swt.widgets.Table; | |
29 | import org.eclipse.swt.widgets.Widget; | |
30 | ||
31 | import org.eclipse.core.runtime.Assert; | |
32 | ||
33 | import org.eclipse.jface.dialogs.IDialogConstants; | |
34 | import org.eclipse.jface.layout.PixelConverter; | |
35 | import org.eclipse.jface.resource.JFaceResources; | |
36 | ||
37 | ||
38 | /** | |
39 | * Utility class to simplify access to some SWT resources. | |
40 | */ | |
41 | public class SWTUtil { | |
42 | ||
43 | /** | |
44 | * The default visible item count for {@link Combo}s. | |
45 | * Workaround for https://bugs.eclipse.org/bugs/show_bug.cgi?id=245569 . | |
46 | * | |
47 | * @see Combo#setVisibleItemCount(int) | |
48 | * | |
49 | * @since 3.5 | |
50 | */ | |
51 | public static final int COMBO_VISIBLE_ITEM_COUNT= 30; | |
52 | ||
53 | /** | |
54 | * Returns the shell for the given widget. If the widget doesn't represent | |
55 | * a SWT object that manage a shell, <code>null</code> is returned. | |
56 | * @param widget the widget | |
57 | * | |
58 | * @return the shell for the given widget | |
59 | */ | |
60 | public static Shell getShell(Widget widget) { | |
61 | if (widget instanceof Control) | |
62 | return ((Control)widget).getShell(); | |
63 | if (widget instanceof Caret) | |
64 | return ((Caret)widget).getParent().getShell(); | |
65 | if (widget instanceof DragSource) | |
66 | return ((DragSource)widget).getControl().getShell(); | |
67 | if (widget instanceof DropTarget) | |
68 | return ((DropTarget)widget).getControl().getShell(); | |
69 | if (widget instanceof Menu) | |
70 | return ((Menu)widget).getParent().getShell(); | |
71 | if (widget instanceof ScrollBar) | |
72 | return ((ScrollBar)widget).getParent().getShell(); | |
73 | ||
74 | return null; | |
75 | } | |
76 | ||
77 | ||
78 | /** | |
79 | * Returns a width hint for a button control. | |
80 | * @param button the button | |
81 | * @return the width hint | |
82 | */ | |
83 | public static int getButtonWidthHint(Button button) { | |
84 | button.setFont(JFaceResources.getDialogFont()); | |
85 | PixelConverter converter= new PixelConverter(button); | |
86 | int widthHint= converter.convertHorizontalDLUsToPixels(IDialogConstants.BUTTON_WIDTH); | |
87 | return Math.max(widthHint, button.computeSize(SWT.DEFAULT, SWT.DEFAULT, true).x); | |
88 | } | |
89 | ||
90 | /** | |
91 | * Sets width and height hint for the button control. | |
92 | * <b>Note:</b> This is a NOP if the button's layout data is not | |
93 | * an instance of <code>GridData</code>. | |
94 | * | |
95 | * @param button the button for which to set the dimension hint | |
96 | */ | |
97 | public static void setButtonDimensionHint(Button button) { | |
98 | Assert.isNotNull(button); | |
99 | Object gd= button.getLayoutData(); | |
100 | if (gd instanceof GridData) { | |
101 | ((GridData)gd).widthHint= getButtonWidthHint(button); | |
102 | ((GridData)gd).horizontalAlignment = GridData.FILL; | |
103 | } | |
104 | } | |
105 | ||
106 | public static int getTableHeightHint(Table table, int rows) { | |
107 | if (table.getFont().equals(JFaceResources.getDefaultFont())) | |
108 | table.setFont(JFaceResources.getDialogFont()); | |
109 | int result= table.getItemHeight() * rows + table.getHeaderHeight(); | |
110 | if (table.getLinesVisible()) | |
111 | result+= table.getGridLineWidth() * (rows - 1); | |
112 | return result; | |
113 | } | |
114 | ||
115 | /** | |
116 | * Adds an accessibility listener returning the given fixed name. | |
117 | * | |
118 | * @param control the control to add the accessibility support to | |
119 | * @param text the name | |
120 | */ | |
121 | public static void setAccessibilityText(Control control, final String text) { | |
122 | control.getAccessible().addAccessibleListener(new AccessibleAdapter() { | |
123 | @Override | |
124 | public void getName(AccessibleEvent e) { | |
125 | if (e.childID == ACC.CHILDID_SELF) { | |
126 | e.result= text; | |
127 | } | |
128 | } | |
129 | }); | |
130 | } | |
131 | ||
132 | /** | |
133 | * Sets the default visible item count for {@link Combo}s. | |
134 | * Workaround for https://bugs.eclipse.org/bugs/show_bug.cgi?id=7845 . | |
135 | * | |
136 | * @param combo the combo | |
137 | * | |
138 | * @see Combo#setVisibleItemCount(int) | |
139 | * @see #COMBO_VISIBLE_ITEM_COUNT | |
140 | * | |
141 | * @since 3.5 | |
142 | */ | |
143 | public static void setDefaultVisibleItemCount(Combo combo) { | |
144 | combo.setVisibleItemCount(COMBO_VISIBLE_ITEM_COUNT); | |
145 | } | |
146 | ||
147 | public static GridLayout newLayoutNoMargins(int columns) { | |
148 | GridLayout layout= new GridLayout(columns, false); | |
149 | layout.marginWidth= 0; | |
150 | layout.marginHeight= 0; | |
151 | return layout; | |
152 | } | |
153 | ||
154 | ||
155 | } |