/*******************************************************************************
* Copyright (c) 2000, 2016 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.help.ui.internal.views;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.ui.forms.widgets.ToggleHyperlink;
public final class Chevron extends ToggleHyperlink {
private static final int[][] offLines = { { 0, 0, 2, 2, 0, 4 },
{ 1, 0, 3, 2, 1, 4 }, { 4, 0, 6, 2, 4, 4 }, { 5, 0, 7, 2, 5, 4 } };
private static final int[][] onLines = { { 2, 0, 0, 2, 2, 4 },
{ 3, 0, 1, 2, 3, 4 }, { 6, 0, 4, 2, 6, 4 }, { 7, 0, 5, 2, 7, 4 } };
/**
* Creates a control in a provided composite.
*
* @param parent
* the parent
* @param style
* the style
*/
public Chevron(Composite parent, int style) {
super(parent, style);
innerWidth = 8;
innerHeight = 5;
marginWidth = 3;
marginHeight = 4;
}
/*
* @see SelectableControl#paint(GC)
*/
@Override
protected void paintHyperlink(GC gc) {
if (hover && getHoverDecorationColor() != null)
gc.setForeground(getHoverDecorationColor());
else if (getDecorationColor() != null)
gc.setForeground(getDecorationColor());
int[][] data;
Rectangle carea = getClientArea();
int x = (carea.width - innerWidth) /2;
int y = (carea.height - innerHeight) / 2;
if (isExpanded())
data = translate(onLines, x, y);
else
data = translate(offLines, x, y);
for (int i=0; i<data.length; i++) {
gc.drawPolyline(data[i]);
}
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++) {
int [] line = data[i];
target[i] = new int[line.length];
for (int j = 0; j < line.length; j += 2) {
target[i][j] = line[j] + x;
}
for (int j = 1; j < line.length; j += 2) {
target[i][j] = line[j] + y;
}
}
return target;
}
}