| /******************************************************************************* |
| * Copyright (c) 2000, 2011 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.jdt.internal.ui.util; |
| |
| import org.eclipse.swt.SWT; |
| import org.eclipse.swt.accessibility.ACC; |
| import org.eclipse.swt.accessibility.AccessibleAdapter; |
| import org.eclipse.swt.accessibility.AccessibleEvent; |
| import org.eclipse.swt.dnd.DragSource; |
| import org.eclipse.swt.dnd.DropTarget; |
| import org.eclipse.swt.layout.GridData; |
| import org.eclipse.swt.layout.GridLayout; |
| import org.eclipse.swt.widgets.Button; |
| import org.eclipse.swt.widgets.Caret; |
| import org.eclipse.swt.widgets.Combo; |
| import org.eclipse.swt.widgets.Control; |
| import org.eclipse.swt.widgets.Menu; |
| import org.eclipse.swt.widgets.ScrollBar; |
| import org.eclipse.swt.widgets.Shell; |
| import org.eclipse.swt.widgets.Table; |
| import org.eclipse.swt.widgets.Widget; |
| |
| import org.eclipse.core.runtime.Assert; |
| |
| import org.eclipse.jface.dialogs.IDialogConstants; |
| import org.eclipse.jface.layout.PixelConverter; |
| import org.eclipse.jface.resource.JFaceResources; |
| |
| |
| /** |
| * Utility class to simplify access to some SWT resources. |
| */ |
| public class SWTUtil { |
| |
| /** |
| * The default visible item count for {@link Combo}s. |
| * Workaround for https://bugs.eclipse.org/bugs/show_bug.cgi?id=245569 . |
| * |
| * @see Combo#setVisibleItemCount(int) |
| * |
| * @since 3.5 |
| */ |
| public static final int COMBO_VISIBLE_ITEM_COUNT= 30; |
| |
| /** |
| * 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. |
| * @param widget the widget |
| * |
| * @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. |
| * @param button the button |
| * @return the width hint |
| */ |
| public static int getButtonWidthHint(Button button) { |
| button.setFont(JFaceResources.getDialogFont()); |
| PixelConverter converter= new PixelConverter(button); |
| int widthHint= converter.convertHorizontalDLUsToPixels(IDialogConstants.BUTTON_WIDTH); |
| return Math.max(widthHint, button.computeSize(SWT.DEFAULT, SWT.DEFAULT, true).x); |
| } |
| |
| /** |
| * 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 button 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).widthHint= getButtonWidthHint(button); |
| ((GridData)gd).horizontalAlignment = GridData.FILL; |
| } |
| } |
| |
| public static int getTableHeightHint(Table table, int rows) { |
| if (table.getFont().equals(JFaceResources.getDefaultFont())) |
| table.setFont(JFaceResources.getDialogFont()); |
| int result= table.getItemHeight() * rows + table.getHeaderHeight(); |
| if (table.getLinesVisible()) |
| result+= table.getGridLineWidth() * (rows - 1); |
| return result; |
| } |
| |
| /** |
| * Adds an accessibility listener returning the given fixed name. |
| * |
| * @param control the control to add the accessibility support to |
| * @param text the name |
| */ |
| public static void setAccessibilityText(Control control, final String text) { |
| control.getAccessible().addAccessibleListener(new AccessibleAdapter() { |
| @Override |
| public void getName(AccessibleEvent e) { |
| if (e.childID == ACC.CHILDID_SELF) { |
| e.result= text; |
| } |
| } |
| }); |
| } |
| |
| /** |
| * Sets the default visible item count for {@link Combo}s. |
| * Workaround for https://bugs.eclipse.org/bugs/show_bug.cgi?id=7845 . |
| * |
| * @param combo the combo |
| * |
| * @see Combo#setVisibleItemCount(int) |
| * @see #COMBO_VISIBLE_ITEM_COUNT |
| * |
| * @since 3.5 |
| */ |
| public static void setDefaultVisibleItemCount(Combo combo) { |
| combo.setVisibleItemCount(COMBO_VISIBLE_ITEM_COUNT); |
| } |
| |
| public static GridLayout newLayoutNoMargins(int columns) { |
| GridLayout layout= new GridLayout(columns, false); |
| layout.marginWidth= 0; |
| layout.marginHeight= 0; |
| return layout; |
| } |
| |
| |
| } |