content: /*******************************************************************************
   * 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:
   *   Jesper Kamstrup Linnet (eclipse@kamstrup-linnet.dk) - initial API and implementation 
   *          (report 36180: Callers/Callees view)
   *******************************************************************************/
  package org.eclipse.wst.jsdt.internal.ui.callhierarchy;
  
  import org.eclipse.core.runtime.Assert;
  import org.eclipse.jface.resource.CompositeImageDescriptor;
  import org.eclipse.jface.resource.ImageDescriptor;
  import org.eclipse.swt.graphics.ImageData;
  import org.eclipse.swt.graphics.Point;
  import org.eclipse.wst.jsdt.internal.ui.JavaScriptPlugin;
  import org.eclipse.wst.jsdt.internal.ui.JavaPluginImages;
  
  
  public class CallHierarchyImageDescriptor extends CompositeImageDescriptor {
      
      /** Flag to render the recursive adornment */
      public final static int RECURSIVE=       0x001;
      
      /** Flag to render the callee adornment */
      public final static int MAX_LEVEL=       0x002;
  
      private ImageDescriptor fBaseImage;
      private int fFlags;
      private Point fSize;
  
      /**
       * Creates a new CallHierarchyImageDescriptor.
       * 
       * @param baseImage an image descriptor used as the base image
       * @param flags flags indicating which adornments are to be rendered. See <code>setAdornments</code>
       *  for valid values.
       * @param size the size of the resulting image
       * @see #setAdornments(int)
       */
      public CallHierarchyImageDescriptor(ImageDescriptor baseImage, int flags, Point size) {
          fBaseImage= baseImage;
          Assert.isNotNull(fBaseImage);
          fFlags= flags;
          Assert.isTrue(fFlags >= 0);
          fSize= size;
          Assert.isNotNull(fSize);
      }
      
      /**
       * Sets the descriptors adornments. Valid values are: <code>RECURSIVE</code>, <code>CALLER</code>,
       * <code>CALLEE</code>, <code>MAX_LEVEL</code>, or any combination of those.
       * 
       * @param adornments the image descritpors adornments
       */
      public void setAdornments(int adornments) {
          Assert.isTrue(adornments >= 0);
          fFlags= adornments;
      }
  
      /**
       * Returns the current adornments.
       * 
       * @return the current adornments
       */
      public int getAdronments() {
          return fFlags;
      }
  
      /**
       * Sets the size of the image created by calling <code>createImage()</code>.
       * 
       * @param size the size of the image returned from calling <code>createImage()</code>
       * @see ImageDescriptor#createImage()
       */
      public void setImageSize(Point size) {
          Assert.isNotNull(size);
          Assert.isTrue(size.x >= 0 && size.y >= 0);
          fSize= size;
      }
      
      /**
       * Returns the size of the image created by calling <code>createImage()</code>.
       * 
       * @return the size of the image created by calling <code>createImage()</code>
       * @see ImageDescriptor#createImage()
       */
      public Point getImageSize() {
          return new Point(fSize.x, fSize.y);
      }
      
      /* (non-Javadoc)
       * Method declared in CompositeImageDescriptor
       */
      protected Point getSize() {
          return fSize;
      }
      
      /* (non-Javadoc)
       * Method declared on Object.
       */
      public boolean equals(Object object) {
          if (object == null || !CallHierarchyImageDescriptor.class.equals(object.getClass()))
              return false;
              
          CallHierarchyImageDescriptor other= (CallHierarchyImageDescriptor)object;
          return (fBaseImage.equals(other.fBaseImage) && fFlags == other.fFlags && fSize.equals(other.fSize));
      }
      
      /* (non-Javadoc)
       * Method declared on Object.
       */
      public int hashCode() {
          return fBaseImage.hashCode() | fFlags | fSize.hashCode();
      }
      
      /* (non-Javadoc)
       * Method declared in CompositeImageDescriptor
       */
      protected void drawCompositeImage(int width, int height) {
          ImageData bg= getImageData(fBaseImage);
              
          drawImage(bg, 0, 0);
          drawBottomLeft();
      }  
      
  	private ImageData getImageData(ImageDescriptor descriptor) {
  		ImageData data= descriptor.getImageData(); // see bug 51965: getImageData can return null
  		if (data == null) {
  			data= DEFAULT_IMAGE_DATA;
  			JavaScriptPlugin.logErrorMessage("Image data not available: " + descriptor.toString()); //$NON-NLS-1$
  		}
  		return data;
  	}
      
      private void drawBottomLeft() {
          Point size= getSize();
          int x= 0;
          ImageData data= null;
          if ((fFlags & RECURSIVE) != 0) {
              data= getImageData(JavaPluginImages.DESC_OVR_RECURSIVE);
              drawImage(data, x, size.y - data.height);
              x+= data.width;
          }
          if ((fFlags & MAX_LEVEL) != 0) {
              data= getImageData(JavaPluginImages.DESC_OVR_MAX_LEVEL);
              drawImage(data, x, size.y - data.height);
              x+= data.width;
          }
      }       
  }
  