1 /*******************************************************************************
2 * Copyright (c) 2000, 2004 IBM Corporation and others.
3 * All rights reserved. This program and the accompanying materials
4 * are made available under the terms of the Common Public License v1.0
5 * which accompanies this distribution, and is available at
6 * http://www.eclipse.org/legal/cpl-v10.html
9 * IBM Corporation - initial API and implementation
10 *******************************************************************************/
11 package net.sourceforge.phpdt.internal.ui.util;
13 import org.eclipse.jface.dialogs.IDialogConstants;
14 import org.eclipse.jface.resource.JFaceResources;
16 //import org.eclipse.jface.text.Assert;
17 import org.eclipse.core.runtime.Assert;
18 import org.eclipse.swt.SWT;
19 import org.eclipse.swt.dnd.DragSource;
20 import org.eclipse.swt.dnd.DropTarget;
21 import org.eclipse.swt.layout.GridData;
22 import org.eclipse.swt.widgets.Button;
23 import org.eclipse.swt.widgets.Caret;
24 import org.eclipse.swt.widgets.Control;
25 import org.eclipse.swt.widgets.Display;
26 import org.eclipse.swt.widgets.Menu;
27 import org.eclipse.swt.widgets.ScrollBar;
28 import org.eclipse.swt.widgets.Shell;
29 import org.eclipse.swt.widgets.Table;
30 import org.eclipse.swt.widgets.Widget;
33 * Utility class to simplify access to some SWT resources.
35 public class SWTUtil {
38 * Returns the standard display to be used. The method first checks, if the
39 * thread calling this method has an associated disaply. If so, this display
40 * is returned. Otherwise the method returns the default display.
42 public static Display getStandardDisplay() {
44 display = Display.getCurrent();
46 display = Display.getDefault();
51 * Returns the shell for the given widget. If the widget doesn't represent a
52 * SWT object that manage a shell, <code>null</code> is returned.
54 * @return the shell for the given widget
56 public static Shell getShell(Widget widget) {
57 if (widget instanceof Control)
58 return ((Control) widget).getShell();
59 if (widget instanceof Caret)
60 return ((Caret) widget).getParent().getShell();
61 if (widget instanceof DragSource)
62 return ((DragSource) widget).getControl().getShell();
63 if (widget instanceof DropTarget)
64 return ((DropTarget) widget).getControl().getShell();
65 if (widget instanceof Menu)
66 return ((Menu) widget).getParent().getShell();
67 if (widget instanceof ScrollBar)
68 return ((ScrollBar) widget).getParent().getShell();
74 * Returns a width hint for a button control.
76 public static int getButtonWidthHint(Button button) {
77 button.setFont(JFaceResources.getDialogFont());
78 PixelConverter converter = new PixelConverter(button);
79 int widthHint = converter
80 .convertHorizontalDLUsToPixels(IDialogConstants.BUTTON_WIDTH);
81 return Math.max(widthHint, button.computeSize(SWT.DEFAULT, SWT.DEFAULT,
86 * Returns a height hint for a button control.
88 public static int getButtonHeightHint(Button button) {
89 button.setFont(JFaceResources.getDialogFont());
90 PixelConverter converter = new PixelConverter(button);
92 .convertVerticalDLUsToPixels(IDialogConstants.BUTTON_HEIGHT);
96 * Sets width and height hint for the button control. <b>Note:</b> This is
97 * a NOP if the button's layout data is not an instance of
98 * <code>GridData</code>.
101 * the button for which to set the dimension hint
103 public static void setButtonDimensionHint(Button button) {
104 Assert.isNotNull(button);
105 Object gd = button.getLayoutData();
106 if (gd instanceof GridData) {
107 ((GridData) gd).heightHint = getButtonHeightHint(button);
108 ((GridData) gd).widthHint = getButtonWidthHint(button);
109 ((GridData) gd).horizontalAlignment = GridData.FILL;
113 public static int getTableHeightHint(Table table, int rows) {
114 if (table.getFont().equals(JFaceResources.getDefaultFont()))
115 table.setFont(JFaceResources.getDialogFont());
116 int result = table.getItemHeight() * rows + table.getHeaderHeight();
117 if (table.getLinesVisible())
118 result += table.getGridLineWidth() * (rows - 1);