关于插件中图标对象的获取

默认情况下，插件只能取得gif格式的图片，有时候我们需要获取其他格式的图片，这里就需要自己来写了，最近从另外一个插件aptana下发现它在获取非gif格式图片的一些做法，值得参考
在需要使用图标的地方，需要这样写：

java 代码

private static Image fIconFirefox = JSPlugin.getImage("icons/firefox_icon.png");

JSPlugin中取得照片的相关代码要这样写：

java 代码

/**
 * Returns an image descriptor for the image file at the given
 * plug-in relative path.
 *
 * @param path the path
 * @return the image descriptor
 */
public static ImageDescriptor getImageDescriptor(String path) {
    return AbstractUIPlugin.imageDescriptorFromPlugin("com.bstek.ide.js.editor", path); //$NON-NLS-1$
}

private static Hashtable images = new Hashtable();

/**
 * getImage
 *
 * @param path
 * @return Image
 */
public static Image getImage(String path)
{
    if (images.get(path) == null)
    {
        ImageDescriptor id = getImageDescriptor(path);
        if (id == null)
        {
            return null;
        }

        Image i = id.createImage();
        images.put(path, i);
        return i;
    }
    else
    {
        return (Image) images.get(path);
    }
}

 

最终读取图标对象在AbstractUIPlugin.imageDescriptorFromPlugin()方法中实现

java 代码

  /**
   * Creates and returns a new image descriptor for an image file located
   * within the specified plug-in.
   * <p>
   * This is a convenience method that simply locates the image file in
   * within the plug-in (no image registries are involved). The path is
   * relative to the root of the plug-in, and takes into account files
   * coming from plug-in fragments. The path may include $arg$ elements.
   * However, the path must not have a leading "." or path separator.
   * Clients should use a path like "icons/mysample.gif" rather than
   * "./icons/mysample.gif" or "/icons/mysample.gif".
   * </p>
   *
   * @param pluginId the id of the plug-in containing the image file;
   * <code>null</code> is returned if the plug-in does not exist
   * @param imageFilePath the relative path of the image file, relative to the
   * root of the plug-in; the path must be legal
   * @return an image descriptor, or <code>null</code> if no image
   * could be found
   * @since 3.0
   */
  public static ImageDescriptor imageDescriptorFromPlugin(String pluginId,
          String imageFilePath) {
      if (pluginId == null || imageFilePath == null) {
          throw new IllegalArgumentException();
      }

      // if the bundle is not ready then there is no image
      Bundle bundle = Platform.getBundle(pluginId);
      if (!BundleUtility.isReady(bundle)) {
    return null;
}

      // look for the image (this will check both the plugin and fragment folders
      URL fullPathString = BundleUtility.find(bundle, imageFilePath);
      if (fullPathString == null) {
          try {
              fullPathString = new URL(imageFilePath);
          } catch (MalformedURLException e) {
              return null;
          }
      }

      if (fullPathString == null) {
    return null;
}
      return ImageDescriptor.createFromURL(fullPathString);
  }