Examples of org.eclipse.core.commands.IHandler

org.eclipse.core.commands.IHandler
A handler is the pluggable piece of a command that handles execution. Each command can have zero or more handlers associated with it (in general), of which only one will be active at any given moment in time. When the command is asked to execute, it will simply pass that request on to its active handler, if any. @see AbstractHandler @since 3.1

        contextService.activateContext(EDITOR_CONTEXT_ID);
  }
  
  private void activateHandlers() {
      IHandlerService handlerService = (IHandlerService)getSite().getService(IHandlerService.class);
      IHandler rebuildCAD = new RebuildCADHandler();
      handlerService.activateHandler("com.gstaykov.pscoder.rebuildcad", rebuildCAD);


        IHandler commentHandler = new CommentHandler();
        handlerService.activateHandler("com.gstaykov.pscoder.addcomment", commentHandler);


        IHandler goToDefinitionHandler = new GoToDefinitionHandler();
        handlerService.activateHandler("com.gstaykov.pscoder.gotodefinition", goToDefinitionHandler);


        IHandler quickOutlineHandler = new QuickOutlineHandler();
        handlerService.activateHandler("com.gstaykov.pscoder.quickoutline", quickOutlineHandler);        
  }

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    //add handlers to handler service
    IHandlerService handlerService = (IHandlerService) getSite().getService(IHandlerService.class);
    if (handlerService != null) {
      
      IHandler gotoHandler = new GotoMatchingBracketHandler();
      handlerService.activateHandler(ActionDefinitionIds.GOTO_MATCHING_BRACKET, gotoHandler);
      
      fOutlineHandler = new QuickOutlineHandler();
        handlerService.activateHandler(ActionDefinitionIds.SHOW_OUTLINE, fOutlineHandler);
      
      IHandler toggleCommentHandler = new ToggleLineCommentHandler();
      handlerService.activateHandler(ActionDefinitionIds.TOGGLE_COMMENT, toggleCommentHandler);
      
      IHandler addCommentBlockHandler = new AddBlockCommentHandler();
      handlerService.activateHandler(ActionDefinitionIds.ADD_BLOCK_COMMENT, addCommentBlockHandler);
      
      IHandler removeCommentBlockHandler = new RemoveBlockCommentHandler();
      handlerService.activateHandler(ActionDefinitionIds.REMOVE_BLOCK_COMMENT, removeCommentBlockHandler);
    }


    fShowPropertiesAction = new ShowPropertiesAction(getEditorPart(), getSelectionProvider());
    fFoldingGroup = new FoldingActionGroup(this, getSourceViewer());

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    //add handlers to handler service
    IHandlerService handlerService = (IHandlerService) getSite().getService(IHandlerService.class);
    if (handlerService != null) {
      
      IHandler gotoHandler = new GotoMatchingBracketHandler();
      handlerService.activateHandler(ActionDefinitionIds.GOTO_MATCHING_BRACKET, gotoHandler);
      
      fOutlineHandler = new QuickOutlineHandler();
        handlerService.activateHandler(ActionDefinitionIds.SHOW_OUTLINE, fOutlineHandler);
      
      IHandler toggleCommentHandler = new ToggleLineCommentHandler();
      handlerService.activateHandler(ActionDefinitionIds.TOGGLE_COMMENT, toggleCommentHandler);
      
      IHandler addCommentBlockHandler = new AddBlockCommentHandler();
      handlerService.activateHandler(ActionDefinitionIds.ADD_BLOCK_COMMENT, addCommentBlockHandler);
      
      IHandler removeCommentBlockHandler = new RemoveBlockCommentHandler();
      handlerService.activateHandler(ActionDefinitionIds.REMOVE_BLOCK_COMMENT, removeCommentBlockHandler);
    }


    fShowPropertiesAction = new ShowPropertiesAction(getEditorPart(), getSelectionProvider());
    fFoldingGroup = new FoldingActionGroup(this, getSourceViewer());

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    {
        IHandlerService handlerService = ( IHandlerService ) PlatformUI.getWorkbench().getAdapter(
            IHandlerService.class );
        if ( handlerService != null )
        {
            IHandler handler = new org.eclipse.core.commands.AbstractHandler()
            {
                public Object execute( ExecutionEvent event ) throws org.eclipse.core.commands.ExecutionException
                {
                    showPossibleCompletions();
                    return null;

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    {
        IHandlerService handlerService = ( IHandlerService ) PlatformUI.getWorkbench().getAdapter(
            IHandlerService.class );
        if ( handlerService != null )
        {
            IHandler handler = new org.eclipse.core.commands.AbstractHandler()
            {
                public Object execute( ExecutionEvent event ) throws org.eclipse.core.commands.ExecutionException
                {
                    showPossibleCompletions();
                    return null;

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   */
  public final IHandler getHandler(String commandId) {
    if (fHandlers == null)
      throw new IllegalStateException();


    IHandler handler= (IHandler)fHandlers.get(commandId);
    if (handler != null)
      return handler;
    
    Assert.isLegal(false);
    return null;

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   * 
   * @param action
   *            the action to register.
   */
  private void registerKeybindings(IAction action) {
    final IHandler handler = new ActionHandler(action);
    final IHandlerService handlerService = (IHandlerService) PlatformUI.getWorkbench().getService(IHandlerService.class);
    final IHandlerActivation activation = handlerService.activateHandler(
        action.getActionDefinitionId(), handler,
        new ActiveShellExpression(dialog.getShell()));
    activations.add(activation);

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   * 
   * @since 3.1
   */
    public final void activateHandler() {
    if (handlerActivation == null) {
      final IHandler handler = new ShowViewHandler(getId());
      final IHandlerService handlerService = (IHandlerService) PlatformUI.getWorkbench().getService(IHandlerService.class);
      handlerActivation = handlerService
          .activateHandler(getId(), handler);
    }
    }

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   * should be created.
   */
  void checkCreatePinEditorShortcutKeyHandler() {
    if (pinEditorHandlerActivation == null) {
      final Shell shell = window.getShell();
      final IHandler pinEditorHandler = new AbstractHandler() {
        public final Object execute(final ExecutionEvent event) {
          // check if the "Close editors automatically" preference is
          // set
          IPreferenceStore store = WorkbenchPlugin.getDefault().getPreferenceStore();
          if (store

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     * active workbench window is instantiated Eclipse RCP causes this
     * function to fail quietly, so we just don't set the already installed
     * flag true until after it is successful
     */
    ISelectionService selectionService = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getSelectionService();
    final IHandler handler = this;
    selectionService.addSelectionListener(new ISelectionListener() {
      @Override
      public void selectionChanged(IWorkbenchPart part, ISelection selection) {
        fireHandlerChanged(new HandlerEvent(handler, true, false));
      }

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