OverlayIcon.java :  » IDE-Eclipse » pde » org » eclipse » pde » internal » runtime » Java Open Source

/*******************************************************************************
 *  Copyright (c) 2000, 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.pde.internal.runtime;

import org.eclipse.jface.resource.CompositeImageDescriptor;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.swt.graphics.Point;

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;
  }
}