| /******************************************************************************* |
| * Copyright (c) 2000, 2003 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Common Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/cpl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.ui.forms.widgets; |
| import org.eclipse.swt.SWT; |
| import org.eclipse.swt.graphics.*; |
| import org.eclipse.swt.widgets.Composite; |
| /** |
| * A custom selectable control that can be used to control areas that can be |
| * expanded or collapsed. The control control can be toggled between selected |
| * and deselected state with a mouse or by pressing 'Enter' while the control |
| * has focus. |
| * <p> |
| * The control is rendered as a triangle that points to the right in the |
| * collapsed and down in the expanded state. Triangle color can be changed. |
| * |
| * @see TreeNode |
| * @since 3.0 |
| */ |
| public final class Twistie extends ToggleHyperlink { |
| private static final int[] onPoints = {0, 2, 8, 2, 4, 6}; |
| private static final int[] offPoints = {2, -1, 2, 8, 6, 4}; |
| /** |
| * Creates a control in a provided composite. |
| * |
| * @param parent |
| * the parent |
| * @param style |
| * the style |
| */ |
| public Twistie(Composite parent, int style) { |
| super(parent, SWT.NO_BACKGROUND | style); |
| innerWidth = 9; |
| innerHeight = 9; |
| } |
| /* |
| * @see SelectableControl#paint(GC) |
| */ |
| protected void paintHyperlink(GC gc) { |
| if (hover && geHoverDecorationColor() != null) |
| gc.setBackground(geHoverDecorationColor()); |
| else if (getDecorationColor() != null) |
| gc.setBackground(getDecorationColor()); |
| else |
| gc.setBackground(getForeground()); |
| int[] data; |
| Point size = getSize(); |
| int x = (size.x - 9) / 2; |
| int y = (size.y - 9) / 2; |
| if (isExpanded()) |
| data = translate(onPoints, x, y); |
| else |
| data = translate(offPoints, x, y); |
| gc.fillPolygon(data); |
| gc.setBackground(getBackground()); |
| } |
| private int[] translate(int[] data, int x, int y) { |
| int[] target = new int[data.length]; |
| for (int i = 0; i < data.length; i += 2) { |
| target[i] = data[i] + x; |
| } |
| for (int i = 1; i < data.length; i += 2) { |
| target[i] = data[i] + y; |
| } |
| return target; |
| } |
| } |