/*******************************************************************************
* Copyright (c) 2000, 2015 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
* Ralf M Petter<ralf.petter@gmail.com> - Bug 510902
*******************************************************************************/
package org.eclipse.ui.forms.widgets;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Point;
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.
* <p>
* <dl>
* <dt><b>Styles:</b></dt>
* <dd>None</dd>
* </dl>
*
* @see TreeNode
* @since 3.0
*/
public 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, style);
innerWidth = 9;
innerHeight = 9;
}
/*
* @see SelectableControl#paint(GC)
*/
@Override
protected void paintHyperlink(GC gc) {
int as = gc.getAntialias();
gc.setAntialias(SWT.ON);
Color bg;
if (!isEnabled())
bg = getDisplay().getSystemColor(SWT.COLOR_WIDGET_NORMAL_SHADOW);
else if (hover && getHoverDecorationColor() != null)
bg = getHoverDecorationColor();
else if (getDecorationColor() != null)
bg = getDecorationColor();
else
bg = getForeground();
gc.setBackground(bg);
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());
gc.setAntialias(as);
}
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;
}
@Override
public void setEnabled(boolean enabled) {
super.setEnabled(enabled);
redraw();
}
}