OverlayIcon.java :  » IDE-Eclipse » update » org » eclipse » update » internal » ui » parts » Java Open Source

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/*******************************************************************************
 * Copyright (c) 2000, 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.update.internal.ui.parts;

import org.eclipse.jface.resource.*;
import org.eclipse.swt.graphics.*;

/**
 * An OverlayIcon consists of a main icon and several adornments.
 */
public class OverlayIcon extends CompositeImageDescriptor {
  
  static final int DEFAULT_WIDTH= 16;
  static final int DEFAULT_HEIGHT= 16;
  
  private Point fSize= null;
    
  private ImageDescriptor fBase;
  private ImageDescriptor fOverlays[][];

  public OverlayIcon(ImageDescriptor base, ImageDescriptor[][] overlays) {
    fBase= base;
    if (fBase == null)
      fBase= ImageDescriptor.getMissingImageDescriptor();
    fOverlays= overlays;
    fSize= new Point(DEFAULT_WIDTH, DEFAULT_HEIGHT);
  }
  public OverlayIcon(ImageDescriptor base, ImageDescriptor[][] overlays, Point size) {
    fBase= base;
    if (fBase == null)
      fBase= ImageDescriptor.getMissingImageDescriptor();
    fOverlays= overlays;
    fSize= size;
  }
  protected void drawBottomLeft(ImageDescriptor[] overlays) {
    if (overlays == null)
      return;
    int length= overlays.length;
    int x= 0;
    for (int i= 0; i < 3; i++) {
      if (i < length && overlays[i] != null) {
        ImageData id= overlays[i].getImageData();
        drawImage(id, x, getSize().y-id.height);
        x+= id.width;
      }
    }
  }
  protected void drawBottomRight(ImageDescriptor[] overlays) {
    if (overlays == null)
      return;
    int length= overlays.length;
    int x= getSize().x;
    for (int i= 2; i >= 0; i--) {
      if (i < length && overlays[i] != null) {
        ImageData id= overlays[i].getImageData();
        x-= id.width;
        drawImage(id, x, getSize().y-id.height);
      }
    }
  }
  protected void drawCompositeImage(int width, int height) {
    ImageData bg= fBase.getImageData();
    drawImage(bg, 0, 0);
    
    if (fOverlays != null) {
      if (fOverlays.length > 0)
        drawTopRight( fOverlays[0]);
        
      if (fOverlays.length > 1)
        drawBottomRight(fOverlays[1]);
        
      if (fOverlays.length > 2)
        drawBottomLeft(fOverlays[2]);
        
      if (fOverlays.length > 3)
        drawTopLeft(fOverlays[3]);
    }  
  }
  protected void drawTopLeft(ImageDescriptor[] overlays) {
    if (overlays == null)
      return;
    int length= overlays.length;
    int x= 0;
    for (int i= 0; i < 3; i++) {
      if (i < length && overlays[i] != null) {
        ImageData id= overlays[i].getImageData();
        drawImage(id, x, 0);
        x+= id.width;
      }
    }
  }
  protected void drawTopRight(ImageDescriptor[] overlays) {
    if (overlays == null)
      return;
    int length= overlays.length;
    int x= getSize().x;
    for (int i= 2; i >= 0; i--) {
      if (i < length && overlays[i] != null) {
        ImageData id= overlays[i].getImageData();
        x-= id.width;
        drawImage(id, x, 0);
      }
    }
  }

  protected Point getSize() {
    return fSize;
  }
}
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