/*******************************************************************************
* Copyright (c) 2005, 2006 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.internal;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;
import org.eclipse.swt.graphics.Cursor;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.ui.plugin.AbstractUIPlugin;
public class DragHandle extends Composite implements PaintListener {
Cursor dragCursor;
Image handleImage;
ImageDescriptor descriptor;
private boolean isHorizontal;
private static int margin = 2;
public DragHandle(Composite parent) {
super(parent, SWT.NONE);
dragCursor = new Cursor(parent.getDisplay(),
SWT.CURSOR_SIZEALL);
addPaintListener(this);
descriptor = AbstractUIPlugin.imageDescriptorFromPlugin(WorkbenchPlugin.PI_WORKBENCH, "icons/misc/handle.gif"); //$NON-NLS-1$
handleImage = new Image(parent.getDisplay(), 4, 4);
GC context = new GC(handleImage);
context.setForeground(parent.getDisplay().getSystemColor(SWT.COLOR_WIDGET_BACKGROUND));
context.drawPoint(0,0);
context.drawPoint(2,0);
context.drawPoint(3,0);
context.drawPoint(3,1);
context.drawPoint(0,2);
context.drawPoint(3,2);
context.drawPoint(0,3);
context.drawPoint(1,3);
context.drawPoint(2,3);
context.drawPoint(3,3);
context.setForeground(parent.getDisplay().getSystemColor(SWT.COLOR_WIDGET_NORMAL_SHADOW));
context.drawPoint(1,0);
context.drawPoint(0,1);
context.setForeground(parent.getDisplay().getSystemColor(SWT.COLOR_WIDGET_DARK_SHADOW));
context.drawPoint(1,1);
context.setForeground(parent.getDisplay().getSystemColor(SWT.COLOR_WIDGET_HIGHLIGHT_SHADOW));
context.drawPoint(1,2);
context.drawPoint(2,1);
context.drawPoint(2,2);
context.dispose();
setCursor(dragCursor);
}
public void paintControl(PaintEvent e) {
Point size = getSize();
if (handleImage != null) {
Rectangle ibounds = handleImage.getBounds();
int x = ((size.x - 2 * margin) % ibounds.width) / 2 + margin;
int y = ((size.y - 2 * margin) % ibounds.height) / 2 + margin;
for (;;) {
e.gc.drawImage(handleImage, x, y);
if (isHorizontal) {
x += ibounds.width;
if (x + ibounds.width > size.x - margin) {
break;
}
} else {
y += ibounds.height;
if (y + ibounds.height > size.y - margin) {
break;
}
}
}
}
}
public Point computeSize(int wHint, int hHint, boolean changed) {
Point result = new Point(wHint, hHint);
Rectangle ibounds = handleImage.getBounds();
if (wHint == SWT.DEFAULT) {
result.x = ibounds.width + 2 * margin;
}
if (hHint == SWT.DEFAULT) {
result.y = ibounds.height + 2 * margin;
}
return result;
}
public void setHorizontal(boolean isHorizontal) {
this.isHorizontal = isHorizontal;
}
public void dispose() {
if (isDisposed()) {
return;
}
super.dispose();
dragCursor.dispose();
handleImage.dispose();
JFaceResources.getResources().destroyImage(descriptor);
}
}