/*******************************************************************************
* Copyright (c) 2006, 2008 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.egit.ui.internal;
import java.util.Arrays;
import org.eclipse.egit.ui.UIUtils;
import org.eclipse.jface.resource.CompositeImageDescriptor;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.viewers.DecorationOverlayIcon;
import org.eclipse.jface.viewers.IDecoration;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.swt.graphics.Point;
/**
* A <code>DecorationOverlayIcon</code> is an image descriptor that can be used
* to overlay decoration images on to the 4 corner quadrants of a base image
* descriptor. The four quadrants are {@link IDecoration#TOP_LEFT},
* {@link IDecoration#TOP_RIGHT}, {@link IDecoration#BOTTOM_LEFT} and
* {@link IDecoration#BOTTOM_RIGHT}. Additionally, the overlay can be used to
* provide an underlay corresponding to {@link IDecoration#UNDERLAY}.
*
* This class is modeled after {@link DecorationOverlayIcon} but supports using
* a base image descriptor instead of a base image.
*/
public class DecorationOverlayDescriptor extends CompositeImageDescriptor {
// the base image
private ImageDescriptor base;
// the overlay images
private ImageDescriptor[] overlays;
// the size
private Point size;
/**
* Create the decoration overlay for the base image descriptor using the
* array of provided overlays. The indices of the array correspond to the
* values of the 5 overlay constants defined on {@link IDecoration} (
* {@link IDecoration#TOP_LEFT}, {@link IDecoration#TOP_RIGHT},
* {@link IDecoration#BOTTOM_LEFT}, {@link IDecoration#BOTTOM_RIGHT} and
* {@link IDecoration#UNDERLAY}).
*
* @param baseImage
* the base image
* @param overlaysArray
* the overlay images
* @param sizeValue
* the size of the resulting image
*/
public DecorationOverlayDescriptor(ImageDescriptor baseImage,
ImageDescriptor[] overlaysArray, Point sizeValue) {
this.base = baseImage;
this.overlays = overlaysArray;
this.size = sizeValue;
}
/**
* Create the decoration overlay for the base image descriptor using the
* array of provided overlays. The indices of the array correspond to the
* values of the 5 overlay constants defined on {@link IDecoration} (
* {@link IDecoration#TOP_LEFT}, {@link IDecoration#TOP_RIGHT},
* {@link IDecoration#BOTTOM_LEFT}, {@link IDecoration#BOTTOM_RIGHT} and
* {@link IDecoration#UNDERLAY}).
*
* @param baseImage
* the base image
* @param overlaysArray
* the overlay images
*/
public DecorationOverlayDescriptor(ImageDescriptor baseImage,
ImageDescriptor[] overlaysArray) {
this(baseImage, overlaysArray, UIUtils.getSize(baseImage));
}
/**
* Create a decoration overlay icon that will place the given overlay icon
* in the given quadrant of the base image descriptor.
*
* @param baseImage
* the base image
* @param overlayImage
* the overlay image
* @param quadrant
* the quadrant (one of {@link IDecoration} (
* {@link IDecoration#TOP_LEFT}, {@link IDecoration#TOP_RIGHT},
* {@link IDecoration#BOTTOM_LEFT},
* {@link IDecoration#BOTTOM_RIGHT} or
* {@link IDecoration#UNDERLAY})
*/
public DecorationOverlayDescriptor(ImageDescriptor baseImage,
ImageDescriptor overlayImage, int quadrant) {
this(baseImage, createArrayFrom(overlayImage, quadrant));
}
/**
* Convert the given image and quadrant into the proper input array.
*
* @param overlayImage
* the overlay image
* @param quadrant
* the quadrant
* @return an array with the given image in the proper quadrant
*/
private static ImageDescriptor[] createArrayFrom(
ImageDescriptor overlayImage, int quadrant) {
ImageDescriptor[] descs = new ImageDescriptor[] { null, null, null,
null, null };
descs[quadrant] = overlayImage;
return descs;
}
/**
* Draw the overlays for the receiver.
*
* @param overlaysArray
*/
private void drawOverlays(ImageDescriptor[] overlaysArray) {
for (int i = 0; i < overlays.length; i++) {
ImageDescriptor overlay = overlaysArray[i];
if (overlay == null)
continue;
ImageData overlayData = overlay.getImageData();
// Use the missing descriptor if it is not there.
if (overlayData == null)
overlayData = ImageDescriptor.getMissingImageDescriptor()
.getImageData();
switch (i) {
case IDecoration.TOP_LEFT:
drawImage(overlayData, 0, 0);
break;
case IDecoration.TOP_RIGHT:
drawImage(overlayData, size.x - overlayData.width, 0);
break;
case IDecoration.BOTTOM_LEFT:
drawImage(overlayData, 0, size.y - overlayData.height);
break;
case IDecoration.BOTTOM_RIGHT:
drawImage(overlayData, size.x - overlayData.width, size.y
- overlayData.height);
break;
default:
break;
}
}
}
@Override
public boolean equals(Object o) {
if (!(o instanceof DecorationOverlayDescriptor))
return false;
DecorationOverlayDescriptor other = (DecorationOverlayDescriptor) o;
return base.equals(other.base)
&& Arrays.equals(overlays, other.overlays);
}
@Override
public int hashCode() {
int code = base.hashCode();
for (int i = 0; i < overlays.length; i++)
if (overlays[i] != null)
code ^= overlays[i].hashCode();
return code;
}
@Override
protected void drawCompositeImage(int width, int height) {
if (overlays.length > IDecoration.UNDERLAY) {
ImageDescriptor underlay = overlays[IDecoration.UNDERLAY];
if (underlay != null)
drawImage(underlay.getImageData(), 0, 0);
}
if (overlays.length > IDecoration.REPLACE
&& overlays[IDecoration.REPLACE] != null)
drawImage(overlays[IDecoration.REPLACE].getImageData(), 0, 0);
else
drawImage(getBaseImageData(), 0, 0);
drawOverlays(overlays);
}
private ImageData getBaseImageData() {
final ImageData data = base.getImageData();
return data != null ? data : DEFAULT_IMAGE_DATA;
}
@Override
protected Point getSize() {
return size;
}
@Override
protected int getTransparentPixel() {
return getBaseImageData().transparentPixel;
}
}