Examples of org.eclipse.jface.resource.ResourceManager

org.eclipse.jface.resource.ResourceManager
This class manages SWT resources. It manages reference-counted instances of resources such as Fonts, Images, and Colors, and allows them to be accessed using descriptors. Everything allocated through the registry should also be disposed through the registry. Since the resources are shared and reference counted, they should never be disposed directly.
ResourceManager handles correct allocation and disposal of resources. It differs from the various JFace *Registry classes, which also map symbolic IDs onto resources. In general, you should use a *Registry class to map IDs onto descriptors, and use a ResourceManager to convert the descriptors into real Images/Fonts/etc.
@since 3.1

   * @return <code>true</code> if there are images for this action,
   *         <code>false</code> if not
   */
  private boolean updateImages(boolean forceImage) {


    ResourceManager parentResourceManager = JFaceResources.getResources();


    if (widget instanceof ToolItem) {
      if (USE_COLOR_ICONS) {
        ImageDescriptor image = action.getHoverImageDescriptor();
        if (image == null) {

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        public void invoke(Widget toCall, DeviceResourceDescriptor newDescriptor) {
            if (newDescriptor == oldDescriptor) {
                return;
            }
            
            ResourceManager mgr = JFaceResources.getResources(toCall.getDisplay());
            
            Object newResource;
            try {
                newResource = newDescriptor == null? null : mgr.create(newDescriptor);
            } catch (DeviceResourceException e1) {
                WorkbenchPlugin.log(e1);
                return;
            }
            
            try {
                method.invoke(toCall, new Object[] {newResource});
            } catch (IllegalArgumentException e) {
                throw e;
            } catch (IllegalAccessException e) {
                WorkbenchPlugin.log(e);
                return;
            } catch (InvocationTargetException e) {
                if (e.getTargetException() instanceof RuntimeException) {
                    throw (RuntimeException)e.getTargetException();
                }
                WorkbenchPlugin.log(e);
                return;
            }
            
            // Deallocate the old image 
            if (oldDescriptor != null) {
                // Dispose the image
                mgr.destroy(oldDescriptor);
            }
            
            // Remember the new image for next time
            
            oldDescriptor = newDescriptor;

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        }


        public void dispose() {
            // Deallocate the old image 
            if (oldDescriptor != null) {
                ResourceManager mgr = JFaceResources.getResources();
                // Dispose the image
                mgr.destroy(oldDescriptor);
                oldDescriptor = null;
            }                


        }

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  @Override
  protected Control createDialogArea(Composite parent) {
    Composite main = new Composite(parent, SWT.NONE);
    main.setLayout(new GridLayout(1, false));
    GridDataFactory.fillDefaults().grab(true, true).applyTo(main);
    final ResourceManager resources = new LocalResourceManager(
        JFaceResources.getResources());
    UIUtils.hookDisposal(main, resources);
    table = new CommitGraphTable(main, null, resources);
    table.setRelativeDate(GitHistoryPage.isShowingRelativeDates());
    table.getTableView().addSelectionChangedListener(

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   * @return <code>true</code> if there are images for this action,
   *         <code>false</code> if not
   */
  private boolean updateImages(boolean forceImage) {


    ResourceManager parentResourceManager = JFaceResources.getResources();


    if (widget instanceof ToolItem) {
      if (USE_COLOR_ICONS) {
        ImageDescriptor image = action.getHoverImageDescriptor();
        if (image == null) {

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