| /* |
| * (c) Copyright IBM Corp. 2000, 2001. |
| * All Rights Reserved. |
| */ |
| package org.eclipse.debug.internal.ui; |
| |
| |
| import org.eclipse.swt.SWT; |
| import org.eclipse.swt.dnd.DragSource; |
| import org.eclipse.swt.dnd.DropTarget; |
| import org.eclipse.swt.graphics.Image; |
| import org.eclipse.swt.layout.GridData; |
| import org.eclipse.swt.widgets.Button; |
| import org.eclipse.swt.widgets.Caret; |
| import org.eclipse.swt.widgets.Composite; |
| import org.eclipse.swt.widgets.Control; |
| import org.eclipse.swt.widgets.Display; |
| import org.eclipse.swt.widgets.Menu; |
| import org.eclipse.swt.widgets.ScrollBar; |
| import org.eclipse.swt.widgets.Shell; |
| import org.eclipse.swt.widgets.Widget; |
| |
| import org.eclipse.jface.dialogs.IDialogConstants; |
| import org.eclipse.jface.util.Assert; |
| |
| /** |
| * Utility class to simplify access to some SWT resources. |
| */ |
| public class SWTUtil { |
| |
| /** |
| * Returns the standard display to be used. The method first checks, if |
| * the thread calling this method has an associated disaply. If so, this |
| * display is returned. Otherwise the method returns the default display. |
| */ |
| public static Display getStandardDisplay() { |
| Display display; |
| display= Display.getCurrent(); |
| if (display == null) |
| display= Display.getDefault(); |
| return display; |
| } |
| |
| /** |
| * Returns the shell for the given widget. If the widget doesn't represent |
| * a SWT object that manage a shell, <code>null</code> is returned. |
| * |
| * @return the shell for the given widget |
| */ |
| public static Shell getShell(Widget widget) { |
| if (widget instanceof Control) |
| return ((Control)widget).getShell(); |
| if (widget instanceof Caret) |
| return ((Caret)widget).getParent().getShell(); |
| if (widget instanceof DragSource) |
| return ((DragSource)widget).getControl().getShell(); |
| if (widget instanceof DropTarget) |
| return ((DropTarget)widget).getControl().getShell(); |
| if (widget instanceof Menu) |
| return ((Menu)widget).getParent().getShell(); |
| if (widget instanceof ScrollBar) |
| return ((ScrollBar)widget).getParent().getShell(); |
| |
| return null; |
| } |
| |
| |
| /** |
| * Returns a width hint for a button control. |
| */ |
| public static int getButtonWidthHint(Button button) { |
| PixelConverter converter= new PixelConverter(button); |
| int widthHint= converter.convertHorizontalDLUsToPixels(IDialogConstants.BUTTON_WIDTH); |
| return Math.max(widthHint, button.computeSize(SWT.DEFAULT, SWT.DEFAULT, true).x); |
| } |
| |
| /** |
| * Returns a height hint for a button control. |
| */ |
| public static int getButtonHeigthHint(Button button) { |
| PixelConverter converter= new PixelConverter(button); |
| return converter.convertVerticalDLUsToPixels(IDialogConstants.BUTTON_HEIGHT); |
| } |
| |
| |
| /** |
| * Sets width and height hint for the button control. |
| * <b>Note:</b> This is a NOP if the button's layout data is not |
| * an instance of <code>GridData</code>. |
| * |
| * @param the button for which to set the dimension hint |
| */ |
| public static void setButtonDimensionHint(Button button) { |
| Assert.isNotNull(button); |
| Object gd= button.getLayoutData(); |
| if (gd instanceof GridData) { |
| ((GridData)gd).heightHint= getButtonHeigthHint(button); |
| ((GridData)gd).widthHint= getButtonWidthHint(button); |
| ((GridData)gd).horizontalAlignment = GridData.FILL; |
| } |
| } |
| |
| |
| /** |
| * Creates and returns a new push button with the given |
| * label and/or image. |
| * |
| * @param parent parent control |
| * @param label button label or <code>null</code> |
| * @param image image of <code>null</code> |
| * |
| * @return a new push button |
| */ |
| public static Button createPushButton(Composite parent, String label, Image image) { |
| Button button = new Button(parent, SWT.PUSH); |
| if (image != null) { |
| button.setImage(image); |
| } |
| if (label != null) { |
| button.setText(label); |
| } |
| GridData gd = new GridData(); |
| button.setLayoutData(gd); |
| SWTUtil.setButtonDimensionHint(button); |
| return button; |
| } |
| |
| /** |
| * Creates and returns a new radio button with the given |
| * label. |
| * |
| * @param parent parent control |
| * @param label button label or <code>null</code> |
| * |
| * @return a new radio button |
| */ |
| public static Button createRadioButton(Composite parent, String label) { |
| Button button = new Button(parent, SWT.RADIO); |
| if (label != null) { |
| button.setText(label); |
| } |
| GridData gd = new GridData(); |
| button.setLayoutData(gd); |
| SWTUtil.setButtonDimensionHint(button); |
| return button; |
| } |
| } |