Examples of com.google.gwt.user.client.Command

com.google.gwt.user.client.Command
Encapsulates an action for later execution, often from a different context.
The Command interface provides a layer of separation between the code specifying some behavior and the code invoking that behavior. This separation aids in creating reusable code. For example, a {@link com.google.gwt.user.client.ui.MenuItem} can have a Commandassociated with it that it executes when the menu item is chosen by the user. Importantly, the code that constructed the Command to be executed when the menu item is invoked knows nothing about the internals of the MenuItem class and vice-versa.

The Command interface is often implemented with an anonymous inner class. For example,
```
 Command sayHello = new Command() { public void execute() { Window.alert("Hello"); } }; sayHello.execute(); 
```

    public String getText() {
        return suggestBox.getText();
    }


    public void setFocus(final boolean b) {
        DeferredCommand.addCommand(new Command() {
            public void execute() {
                suggestBox.setFocus(b);
            }
        });

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        ConstHolder.resources = (Resources) GWT.create(Resources.class);
        StyleInjector.injectStylesheet(ConstHolder.resources.gwtstyles()
                .getText(), ConstHolder.resources);


        DeferredCommand.addCommand(new Command() {
            public void execute() {
                onModuleLoad2();
            }
        });
    }

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    if (!toggleKey(event) && !context.selectedWidgets.contains(mouseDownWidget)) {
      context.dragController.clearSelection();
      context.dragController.toggleSelection(context.draggable);
    }
    DeferredCommand.addCommand(new Command() {
      public void execute() {
        DOMUtil.cancelAllDocumentSelections();
      }
    });

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      suggestionMenu.clearItems();


      for (Suggestion curSuggestion : suggestions) {
        final SuggestionMenuItem menuItem = new SuggestionMenuItem(
            curSuggestion, oracle.isDisplayStringHTML());
        menuItem.setCommand(new Command() {
          public void execute() {
            SuggestBox.this.setNewSelection(menuItem);
          }
        });

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  public DraggableOptionsPanel(Element draggable) {
    this.draggable = draggable;
    initWidget(uiBinder.createAndBindUi(this));
    // use a deferred command to ensure to init the object when the element is
    // draggabel
    DeferredCommand.addCommand(new Command() {
      public void execute() {
        init();
      }
    });

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   *
   * @return
   */
  private MenuBar createMenuBar() {
    // Create a command that will execute on menu item selection
    Command menuCommand = new Command() {
      private int curPhrase = 0;
      private final String[] phrases = new String[]{
          "Thank you for selecting a menu item", "A fine selection indeed",
          "Don't you have anything better to do than select menu items?",
          "Try something else", "this is just a menu!", "Another wasted click"};

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                }
            } else {
                // Set minimum size and adjust after all components have
                // (supposedly) been drawn completely.
                base.getStyle().setPropertyPx(styleAttribute, MIN_SIZE);
                Scheduler.get().scheduleDeferred(new Command() {


                    @Override
                    public void execute() {
                        final Element p = getElement().getParentElement();
                        if (p.getPropertyInt(domProperty) > (MIN_SIZE + 5)) {
                            if (isVertical()) {
                                setHeight();
                            } else {
                                base.getStyle().clearProperty(styleAttribute);
                            }
                            // Ensure correct position
                            setValue(value, false);
                        }
                    }
                });
            }
        }


        if (!isVertical()) {
            // Draw handle with a delay to allow base to gain maximum width
            Scheduler.get().scheduleDeferred(new Command() {
                @Override
                public void execute() {
                    buildHandle();
                    setValue(value, false);
                }

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     * @param drag
     */
    abstract protected void dragAccepted(VDragEvent drag);


    protected void validate(final VAcceptCallback cb, final VDragEvent event) {
        Command checkCriteria = new Command() {
            @Override
            public void execute() {
                acceptCriteria.accept(event, criterioUIDL, cb);
            }
        };

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        isStarted = false;


        currentDrag = new VDragEvent(transferable, startEvent);
        currentDrag.setCurrentGwtEvent(startEvent);


        final Command startDrag = new Command() {


            @Override
            public void execute() {
                isStarted = true;
                addActiveDragSourceStyleName();
                VDropHandler dh = null;
                if (startEvent != null) {
                    dh = findDragTarget(Element.as(currentDrag
                            .getCurrentGwtEvent().getEventTarget()));
                }
                if (dh != null) {
                    // drag has started on a DropHandler, kind of drag over
                    // happens
                    currentDropHandler = dh;
                    dh.dragEnter(currentDrag);
                }


                if (handleDragEvents) {
                    handlerRegistration = Event
                            .addNativePreviewHandler(defaultDragAndDropEventHandler);
                    if (dragElement != null
                            && dragElement.getParentElement() == null) {
                        attachDragElement();
                    }
                }
                // just capture something to prevent text selection in IE
                Event.setCapture(RootPanel.getBodyElement());
            }


            private void addActiveDragSourceStyleName() {
                ComponentConnector dragSource = currentDrag.getTransferable()
                        .getDragSource();
                dragSource.getWidget().addStyleName(
                        ACTIVE_DRAG_SOURCE_STYLENAME);
            }
        };


        final int eventType = Event.as(startEvent).getTypeInt();
        if (handleDragEvents
                && (eventType == Event.ONMOUSEDOWN || eventType == Event.ONTOUCHSTART)) {
            // only really start drag event on mousemove
            deferredStartRegistration = Event
                    .addNativePreviewHandler(new NativePreviewHandler() {


                        private int startX = Util
                                .getTouchOrMouseClientX(currentDrag
                                        .getCurrentGwtEvent());
                        private int startY = Util
                                .getTouchOrMouseClientY(currentDrag
                                        .getCurrentGwtEvent());


                        @Override
                        public void onPreviewNativeEvent(
                                NativePreviewEvent event) {
                            int typeInt = event.getTypeInt();
                            if (typeInt == -1
                                    && event.getNativeEvent().getType()
                                            .toLowerCase().contains("pointer")) {
                                /*
                                 * Ignore PointerEvents since IE10 and IE11 send
                                 * also MouseEvents for backwards compatibility.
                                 */
                                return;
                            }


                            switch (typeInt) {
                            case Event.ONMOUSEOVER:
                                if (dragElement == null) {
                                    break;
                                }
                                EventTarget currentEventTarget = event
                                        .getNativeEvent()
                                        .getCurrentEventTarget();
                                if (Node.is(currentEventTarget)
                                        && !dragElement.isOrHasChild(Node
                                                .as(currentEventTarget))) {
                                    // drag image appeared below, ignore
                                    break;
                                }
                            case Event.ONKEYDOWN:
                            case Event.ONKEYPRESS:
                            case Event.ONKEYUP:
                            case Event.ONBLUR:
                            case Event.ONFOCUS:
                                // don't cancel possible drag start
                                break;
                            case Event.ONMOUSEOUT:


                                if (dragElement == null) {
                                    break;
                                }
                                EventTarget relatedEventTarget = event
                                        .getNativeEvent()
                                        .getRelatedEventTarget();
                                if (Node.is(relatedEventTarget)
                                        && !dragElement.isOrHasChild(Node
                                                .as(relatedEventTarget))) {
                                    // drag image appeared below, ignore
                                    break;
                                }
                            case Event.ONMOUSEMOVE:
                            case Event.ONTOUCHMOVE:
                                int currentX = Util
                                        .getTouchOrMouseClientX(event
                                                .getNativeEvent());
                                int currentY = Util
                                        .getTouchOrMouseClientY(event
                                                .getNativeEvent());
                                if (Math.abs(startX - currentX) > 3
                                        || Math.abs(startY - currentY) > 3) {
                                    if (deferredStartRegistration != null) {
                                        deferredStartRegistration
                                                .removeHandler();
                                        deferredStartRegistration = null;
                                    }
                                    currentDrag.setCurrentGwtEvent(event
                                            .getNativeEvent());
                                    startDrag.execute();
                                }
                                break;
                            default:
                                // on any other events, clean up the
                                // deferred drag start
                                if (deferredStartRegistration != null) {
                                    deferredStartRegistration.removeHandler();
                                    deferredStartRegistration = null;
                                }
                                currentDrag = null;
                                clearDragElement();
                                break;
                            }
                        }


                    });


        } else {
            startDrag.execute();
        }


        return currentDrag;
    }

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        Profiler.leave("VDragAndDropManager.handleServerResponse");
    }


    private void runDeferredCommands() {
        if (deferredCommand != null) {
            Command command = deferredCommand;
            deferredCommand = null;
            command.execute();
            if (!isBusy()) {
                runDeferredCommands();
            }
        }
    }

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