Examples of com.google.gwt.user.client.ui.Widget

com.google.gwt.user.client.ui.Widget
The base class for the majority of user-interface objects. Widget adds support for receiving events from the browser and being added directly to {@link com.google.gwt.user.client.ui.Panel panels}.

   * @return returns whether a widget was cleared
   */
  protected boolean internalClearCell(Element td, boolean clearInnerHTML) {
    Element container = getCellContainer(td);
    Element maybeChild = DOM.getFirstChild(container);
    Widget widget = null;
    if (maybeChild != null) {
      widget = widgetMap.getWidget(maybeChild);
    }
    if (widget != null) {
      // If there is a widget, remove it.

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    }
  }


  @Override
  protected Widget onInitialize() {
    Widget w = super.onInitialize();
    setTextButton.setVisible(false);
    return w;
  }

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        public void remove() {
          if (lastIndex < 0) {
            throw new IllegalStateException();
          }
          Widget w = (Widget) widgetList.get(lastIndex);
          assert (w.getParent() instanceof HTMLTable);
          w.removeFromParent();
          lastIndex = -1;
        }


        private void findNext() {
          while (++nextIndex < widgetList.size()) {

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    private final DropController dropController;
    private Area targetArea;


    Candidate(DropController dropController) {
      this.dropController = dropController;
      Widget target = dropController.getDropTarget();
      if (!target.isAttached()) {
        throw new IllegalStateException(
            "Unattached drop target. You must call DragController#unregisterDropController for all drop targets not attached to the DOM.");
      }
      targetArea = new WidgetArea(target, null);
    }

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          currentDraggableLocation.getTop());


      int draggableAbsoluteLeft = context.draggable.getAbsoluteLeft();
      int draggableAbsoluteTop = context.draggable.getAbsoluteTop();
      for (Iterator iterator = context.selectedWidgets.iterator(); iterator.hasNext();) {
        Widget widget = (Widget) iterator.next();
        if (widget != context.draggable) {
          int relativeX = widget.getAbsoluteLeft() - draggableAbsoluteLeft;
          int relativeY = widget.getAbsoluteTop() - draggableAbsoluteTop;
          container.add(widget, relativeX, relativeY);
        }
      }
      container.add(context.draggable, 0, 0);
      movablePanel = container;

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    AbsolutePanel container = new AbsolutePanel();
    DOM.setStyleAttribute(container.getElement(), "overflow", "visible");


    WidgetArea draggableArea = new WidgetArea(context.draggable, null);
    for (Iterator iterator = context.selectedWidgets.iterator(); iterator.hasNext();) {
      Widget widget = (Widget) iterator.next();
      WidgetArea widgetArea = new WidgetArea(widget, null);
      Widget proxy = new SimplePanel();
      proxy.setPixelSize(widget.getOffsetWidth(), widget.getOffsetHeight());
      proxy.addStyleName(PRIVATE_CSS_PROXY);
      container.add(proxy, widgetArea.getLeft() - draggableArea.getLeft(), widgetArea.getTop()
          - draggableArea.getTop());
    }


    return container;

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   * @see #saveSelectedWidgetsLocationAndStyle()
   * @see #restoreSelectedWidgetsStyle()
   */
  protected void restoreSelectedWidgetsLocation() {
    for (Iterator iterator = context.selectedWidgets.iterator(); iterator.hasNext();) {
      Widget widget = (Widget) iterator.next();
      SavedWidgetInfo info = (SavedWidgetInfo) savedWidgetInfoMap.get(widget);


      // TODO simplify after enhancement for issue 1112 provides InsertPanel interface
      // http://code.google.com/p/google-web-toolkit/issues/detail?id=1112
      if (info.initialDraggableParent instanceof AbsolutePanel) {

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   * @see #saveSelectedWidgetsLocationAndStyle()
   * @see #restoreSelectedWidgetsLocation()
   */
  protected void restoreSelectedWidgetsStyle() {
    for (Iterator iterator = context.selectedWidgets.iterator(); iterator.hasNext();) {
      Widget widget = (Widget) iterator.next();
      SavedWidgetInfo info = (SavedWidgetInfo) savedWidgetInfoMap.get(widget);
      DOM.setStyleAttribute(widget.getElement(), "margin", info.initialDraggableMargin);
    }
  }

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  }


  public void onDrop(DragContext context) {
    assert dropIndex != -1 : "Should not happen after onPreviewDrop did not veto";
    for (Iterator iterator = context.selectedWidgets.iterator(); iterator.hasNext();) {
      Widget widget = (Widget) iterator.next();
      insert(widget, dropIndex++);
    }
    super.onDrop(context);
  }

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   * @see #restoreSelectedWidgetsLocation()
   */
  protected void saveSelectedWidgetsLocationAndStyle() {
    savedWidgetInfoMap = new HashMap();
    for (Iterator iterator = context.selectedWidgets.iterator(); iterator.hasNext();) {
      Widget widget = (Widget) iterator.next();


      SavedWidgetInfo info = new SavedWidgetInfo();
      info.initialDraggableParent = widget.getParent();


      // TODO simplify after enhancement for issue 1112 provides InsertPanel interface
      // http://code.google.com/p/google-web-toolkit/issues/detail?id=1112
      if (info.initialDraggableParent instanceof AbsolutePanel) {
        info.initialDraggableParentLocation = new WidgetLocation(widget,
            info.initialDraggableParent);
      } else if (info.initialDraggableParent instanceof HorizontalPanel) {
        info.initialDraggableIndex = ((HorizontalPanel) info.initialDraggableParent).getWidgetIndex(widget);
      } else if (info.initialDraggableParent instanceof VerticalPanel) {
        info.initialDraggableIndex = ((VerticalPanel) info.initialDraggableParent).getWidgetIndex(widget);
      } else if (info.initialDraggableParent instanceof FlowPanel) {
        info.initialDraggableIndex = ((FlowPanel) info.initialDraggableParent).getWidgetIndex(widget);
      } else if (info.initialDraggableParent instanceof SimplePanel) {
        // save nothing
      } else {
        throw new RuntimeException(
            "Unable to handle 'initialDraggableParent instanceof "
                + GWT.getTypeName(info.initialDraggableParent)
                + "'; Please create your own DragController and override saveDraggableLocationAndStyle() and restoreDraggableLocation()");
      }


      info.initialDraggableMargin = DOM.getStyleAttribute(widget.getElement(), "margin");
      DOM.setStyleAttribute(widget.getElement(), "margin", "0px");
      savedWidgetInfoMap.put(widget, info);
    }
  }

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