Examples of org.eclipse.jface.resource.ImageDescriptor

org.eclipse.jface.resource.ImageDescriptor
An image descriptor is an object that knows how to create an SWT image. It does not hold onto images or cache them, but rather just creates them on demand. An image descriptor is intended to be a lightweight representation of an image that can be manipulated even when no SWT display exists.
This package defines a concrete image descriptor implementation which reads an image from a file (FileImageDescriptor). It also provides abstract framework classes (this one and CompositeImageDescriptor) which may be subclassed to define news kinds of image descriptors.

Using this abstract class involves defining a concrete subclass and providing an implementation for the getImageData method.

There are two ways to get an Image from an ImageDescriptor. The method createImage will always return a new Image which must be disposed by the caller. Alternatively, createResource() returns a shared Image. When the caller is done with an image obtained from createResource, they must call destroyResource() rather than disposing the Image directly. The result of createResource() can be safely cast to an Image.
@see org.eclipse.swt.graphics.Image


      /* Reset Foreground */
      cell.setForeground(null);


      /* Load the FavIcon */
      ImageDescriptor favicon = OwlUI.getFavicon(bookmark);


      /* Indicate Error */
      if (bookmark.isErrorLoading()) {


        /* Overlay with Error Icon if required */

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  /**
   * @param path
   * @return ImageDescriptor
   */
  public static ImageDescriptor getImageDescriptor(String path) {
    ImageDescriptor desc = DESCRIPTOR_CACHE.get(path);
    if (desc == null) {
      desc = Activator.getImageDescriptor(path);
      DESCRIPTOR_CACHE.put(path, desc);
    }

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   */
  public static ImageDescriptor getFavicon(IBookMark bookmark) {
    Assert.isNotNull(bookmark.getId());


    /* 1.) Check if ImageDescriptor exists in Memory */
    ImageDescriptor descriptor = FAVICO_CACHE.get(bookmark.getId());
    if (descriptor != null)
      return descriptor;


    /* 2.) Check if ImageDescriptor exists in File System */
    File favicon = getImageFile(bookmark.getId());

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  /* Layout */
  private void createLayoutBar() {


    /* Toggle Layout */
    final ImageDescriptor horizontalImg = OwlUI.getImageDescriptor("icons/etool16/horizontal.gif");
    final ImageDescriptor verticalImg = OwlUI.getImageDescriptor("icons/etool16/vertical.gif");


    /* Toggle Layout */
    IAction toggleLayout = new Action("Toggle Layout", IAction.AS_PUSH_BUTTON) {


      @Override
      public void run() {
        fFeedView.toggleLayout();
        fLayoutVertical = !fLayoutVertical;
        fSecondToolBarManager.find(TOGGLE_LAYOUT_ACTION).update(IAction.IMAGE);
      }


      @Override
      public ImageDescriptor getImageDescriptor() {
        if (fLayoutVertical)
          return horizontalImg;
        return verticalImg;
      }
    };
    toggleLayout.setImageDescriptor(OwlUI.getImageDescriptor("icons/etool16/vertical.gif"));
    toggleLayout.setId(TOGGLE_LAYOUT_ACTION);
    fSecondToolBarManager.add(toggleLayout);


    /* Maximize / Minimize Browser */
    final ImageDescriptor img = OwlUI.getImageDescriptor("icons/etool16/browsermaximized.gif");


    IAction toggleMaximized = new Action("", IAction.AS_CHECK_BOX) {


      @Override
      public void run() {

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  /* Layout */
  private void createLayoutBar() {


    /* Toggle Layout */
    final ImageDescriptor horizontalImg = OwlUI.getImageDescriptor("icons/etool16/horizontal.gif");
    final ImageDescriptor verticalImg = OwlUI.getImageDescriptor("icons/etool16/vertical.gif");


    /* Toggle Layout */
    IAction toggleLayout = new Action("Toggle Layout", IAction.AS_PUSH_BUTTON) {


      @Override
      public void run() {
        fFeedView.toggleLayout();
        fLayoutVertical = !fLayoutVertical;
        fSecondToolBarManager.find(TOGGLE_LAYOUT_ACTION).update(IAction.IMAGE);
      }


      @Override
      public ImageDescriptor getImageDescriptor() {
        if (fLayoutVertical)
          return horizontalImg;
        return verticalImg;
      }
    };
    toggleLayout.setImageDescriptor(OwlUI.getImageDescriptor("icons/etool16/vertical.gif"));
    toggleLayout.setId(TOGGLE_LAYOUT_ACTION);
    fSecondToolBarManager.add(toggleLayout);


    /* Maximize / Minimize Browser */
    final ImageDescriptor img = OwlUI.getImageDescriptor("icons/etool16/browsermaximized.gif");


    IAction toggleMaximized = new Action("", IAction.AS_CHECK_BOX) {


      @Override
      public void run() {

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  }


  private static ImageDescriptor makeImage(INews news) {
    IBookMark bookMark = CoreUtils.getBookMark(news.getFeedReference());
    if (bookMark != null) {
      ImageDescriptor favicon = OwlUI.getFavicon(bookMark);
      if (favicon != null)
        return favicon;
    }


    return OwlUI.BOOKMARK;

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  private static ImageDescriptor getImageDescriptor(IFolderChild child) {
    boolean hasNewNews = hasNewsWithState(child, EnumSet.of(INews.State.NEW));


    /* Bookmark */
    if (child instanceof IBookMark) {
      ImageDescriptor favicon = OwlUI.getFavicon((IBookMark) child);
      if (!hasNewNews)
        return (favicon != null) ? favicon : OwlUI.BOOKMARK;


      /* Overlay if News are *new* */
      Image base = (favicon != null) ? OwlUI.getImage(fgResources, favicon) : OwlUI.getImage(fgResources, OwlUI.BOOKMARK);

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      }


      /* Feed Column */
      else if (newsColumn == NewsColumn.FEED) {
        String feedRef = news.getFeedLinkAsText();
        ImageDescriptor feedIcon = fMapFeedLinkToFeedIcon.get(feedRef);
        if (feedIcon == null) {
          IBookMark bookMark = CoreUtils.getBookMark(feedRef);
          if (bookMark != null)
            feedIcon = OwlUI.getFavicon(bookMark);

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        /* Check if Feed-Event affecting us */
        for (FeedEvent event : events) {
          FeedLinkReference feedRef = ((IBookMark) fInput.getMark()).getFeedLinkReference();
          if (feedRef.references(event.getEntity())) {
            ImageDescriptor imageDesc = fInput.getImageDescriptor();


            /* Title Image Change - Update! */
            if (!fTitleImageDescriptor.equals(imageDesc)) {
              fTitleImageDescriptor = imageDesc;

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     * @param path Relative path to image file
     * @return New image descriptor
     */
    public ImageDescriptor createImageDescriptor(String path) {
        URL url = getBundle().getEntry("/");
        ImageDescriptor descriptor = null;
        try {
            descriptor = ImageDescriptor.createFromURL(new URL(url, path));
        } catch (MalformedURLException e) {
            descriptor = ImageDescriptor.getMissingImageDescriptor();
        }

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