/*******************************************************************************
* 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
*******************************************************************************/
package org.eclipse.ui.forms.widgets;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Rectangle;
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 box with a '+' or '-' sign, depending on the
* expansion state. Focus indication is rendered around the box when the
* control has keyboard focus.
* <p>
* <dl>
* <dt><b>Styles:</b></dt>
* <dd>None</dd>
* </dl>
*
* @see Twistie
* @since 3.0
*/
public class TreeNode extends ToggleHyperlink {
/**
* Creates a control in a provided composite.
*
* @param parent
* the parent
* @param style
* the style
*/
public TreeNode(Composite parent, int style) {
super(parent, style);
innerWidth = 10;
innerHeight = 10;
}
@Override
protected void paint(PaintEvent e) {
paintHyperlink(e.gc);
}
@Override
protected void paintHyperlink(GC gc) {
Rectangle box = getBoxBounds(gc);
gc.setForeground(getDisplay().getSystemColor(
SWT.COLOR_WIDGET_NORMAL_SHADOW));
gc.drawRectangle(box);
gc.setForeground(getForeground());
gc.drawLine(box.x + 2, box.y + 4, box.x + 6, box.y + 4);
if (!isExpanded()) {
gc.drawLine(box.x + 4, box.y + 2, box.x + 4, box.y + 6);
}
if (paintFocus && getSelection()) {
gc.setForeground(getForeground());
gc.drawFocus(box.x - 1, box.y - 1, box.width + 3, box.height + 3);
}
}
private Rectangle getBoxBounds(GC gc) {
int x = 1;
int y = 0;
gc.setFont(getFont());
//int height = gc.getFontMetrics().getHeight();
//y = height / 2 - 4;
//y = Math.max(y, 0);
y = 2;
return new Rectangle(x, y, 8, 8);
}
}