Examples of com.google.gwt.user.client.Event$NativePreviewHandler

com.google.gwt.user.client.Event
Handler interface for {@link NativePreviewEvent} events.

    if (autoHiders.isEmpty()) {
      return;
    }


    // TODO(danilatos,user,user): Push signal down a layer - clean this up.
    Event event = Event.as(previewEvent.getNativeEvent());
    int lowLevelType = event.getTypeInt();


    // TODO(danilatos): Insert this logic deeply rather than
    // sprinkling it in event handlers. Also the return value
    // of onEventPreview is the reverse of signal handlers.
    SignalEvent signal = SignalEventImpl.create(event, false);
    if (signal == null) {
      return;
    }


    // Key events (excluding escape) and mousewheel events use hideTopmostAutoHiderForKeyEvent
    if (lowLevelType == Event.ONMOUSEWHEEL || signal.isKeyEvent()) {
      if (hideTopmostAutoHiderForKeyEvent(false)) {
        // TODO(user): We don't call previewEvent.cancel() here, since for the floating-buttons
        // menu we want, for example, space-bar to still shift focus to the next blip.
        // The to-do is to audit the previewEvent.cancel call below and see why it's there (and if
        // it's not needed, eliminate it).
        return;
      }
    }


    // Pressing escape at any time causes us to close and discard the event.
    if (signal.getKeySignalType() == KeySignalType.NOEFFECT &&
        event.getKeyCode() == KeyCodes.KEY_ESCAPE) {
      if (hideTopmostAutoHiderForKeyEvent(true)) {
        previewEvent.cancel();
        return;
      }
    }

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   * @return The current event that is being fired. The current event is only
   * available within the lifetime of the onBrowserEvent function. Once the
   * onBrowserEvent method returns, the current event is reset to null.
   */
  public static EventWrapper getCurrentEvent() {
    Event current = DOM.eventGetCurrentEvent();
    return current != null ?
        new EventWrapper(DOM.eventGetCurrentEvent()) : null;
  }

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  protected boolean isExpanded(XElement row) {
    return appearance.isExpanded(row);
  }


  protected void onMouseDown(RowClickEvent event) {
    Event e = event.getEvent();
    XElement target = e.getEventTarget().cast();
    if (appearance.isExpandElement(target)) {
      e.stopPropagation();
      e.preventDefault();
      XElement row = grid.getView().findRow(target).cast();
      toggleRow(row);
    }
  }

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    handlerRegistration = handle.addDomHandler(handler, MouseDownEvent.getType());


    preview = new BaseEventPreview() {
      @Override
      public boolean onPreview(NativePreviewEvent event) {
        Event e = event.getNativeEvent().<Event> cast();
        e.preventDefault();
        switch (event.getTypeInt()) {
          case Event.ONKEYDOWN:
            if (dragging && e.getKeyCode() == KeyCodes.KEY_ESCAPE) {
              cancelDrag();
            }
            break;
          case Event.ONMOUSEMOVE:
            onMouseMove(e);

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    if (event.isCanceled()) {
      return;
    }


    // If the event targets the popup or the partner, consume it
    Event nativeEvent = Event.as(event.getNativeEvent());
    boolean eventTargetsPopupOrPartner = eventTargetsPopup(nativeEvent)
        || eventTargetsPartner(nativeEvent);
    if (eventTargetsPopupOrPartner) {
      event.consume();
    }


    // Cancel the event if it doesn't target the modal popup. Note that the
    // event can be both canceled and consumed.
    if (modal) {
      event.cancel();
    }


    // Switch on the event type
    int type = nativeEvent.getTypeInt();
    switch (type) {
      case Event.ONKEYDOWN: {
        if (!onKeyDownPreview((char) nativeEvent.getKeyCode(),
            KeyboardListenerCollection.getKeyboardModifiers(nativeEvent))) {
          event.cancel();
        }
        return;
      }
      case Event.ONKEYUP: {
        if (!onKeyUpPreview((char) nativeEvent.getKeyCode(),
            KeyboardListenerCollection.getKeyboardModifiers(nativeEvent))) {
          event.cancel();
        }
        return;
      }
      case Event.ONKEYPRESS: {
        if (!onKeyPressPreview((char) nativeEvent.getKeyCode(),
            KeyboardListenerCollection.getKeyboardModifiers(nativeEvent))) {
          event.cancel();
        }
        return;
      }


      case Event.ONMOUSEDOWN:
        // Don't eat events if event capture is enabled, as this can
        // interfere with dialog dragging, for example.
        if (DOM.getCaptureElement() != null) {
          event.consume();
          return;
        }


        if (!eventTargetsPopupOrPartner && autoHide) {
          hide(true);
          return;
        }
        break;
      case Event.ONMOUSEUP:
      case Event.ONMOUSEMOVE:
      case Event.ONCLICK:
      case Event.ONDBLCLICK: {
        // Don't eat events if event capture is enabled, as this can
        // interfere with dialog dragging, for example.
        if (DOM.getCaptureElement() != null) {
          event.consume();
          return;
        }
        break;
      }


      case Event.ONFOCUS: {
        Element target = nativeEvent.getTarget();
        if (modal && !eventTargetsPopupOrPartner && (target != null)) {
          blur(target);
          event.cancel();
          return;
        }

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        // mouseMove events and we'll
        // be weird relative x & y's from senders anyway.
        // BUT it turns out that FF clientX & Y are rogered for
        // ScrollWheel events, -> replace-with
        // MozillaImpl
        Event curEvent = DOM.eventGetCurrentEvent();


        int lastx = clientMouseImpl.getClientX(curEvent);
        int lasty = clientMouseImpl.getClientY(curEvent);


        int dx = lastx - getAbsoluteLeft() - halfWidth;

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    if (event.isCanceled()) {
      return;
    }


    // If the event targets the popup or the partner, consume it
    Event nativeEvent = Event.as(event.getNativeEvent());
    boolean eventTargetsPopupOrPartner = eventTargetsPopup(nativeEvent)
        || eventTargetsPartner(nativeEvent);
    if (eventTargetsPopupOrPartner) {
      event.consume();
    }


    // Cancel the event if it doesn't target the modal popup. Note that the
    // event can be both canceled and consumed.
    if (modal) {
      event.cancel();
    }


    // Switch on the event type
    int type = nativeEvent.getTypeInt();
    switch (type) {
      case Event.ONKEYDOWN: {
        if (!onKeyDownPreview((char) nativeEvent.getKeyCode(),
            KeyboardListenerCollection.getKeyboardModifiers(nativeEvent))) {
          event.cancel();
        }
        return;
      }
      case Event.ONKEYUP: {
        if (!onKeyUpPreview((char) nativeEvent.getKeyCode(),
            KeyboardListenerCollection.getKeyboardModifiers(nativeEvent))) {
          event.cancel();
        }
        return;
      }
      case Event.ONKEYPRESS: {
        if (!onKeyPressPreview((char) nativeEvent.getKeyCode(),
            KeyboardListenerCollection.getKeyboardModifiers(nativeEvent))) {
          event.cancel();
        }
        return;
      }


      case Event.ONMOUSEDOWN:
        // Don't eat events if event capture is enabled, as this can
        // interfere with dialog dragging, for example.
        if (DOM.getCaptureElement() != null) {
          event.consume();
          return;
        }


        if (!eventTargetsPopupOrPartner && autoHide) {
          hide(true);
          return;
        }
        break;
      case Event.ONMOUSEUP:
      case Event.ONMOUSEMOVE:
      case Event.ONCLICK:
      case Event.ONDBLCLICK: {
        // Don't eat events if event capture is enabled, as this can
        // interfere with dialog dragging, for example.
        if (DOM.getCaptureElement() != null) {
          event.consume();
          return;
        }
        break;
      }


      case Event.ONFOCUS: {
        Element target = nativeEvent.getTarget();
        if (modal && !eventTargetsPopupOrPartner && (target != null)) {
          blur(target);
          event.cancel();
          return;
        }

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        if (!cm.isHidden(i)) {
          before = i;
          break;
        }
      }
      Event event = ce.getEvent();
      int x = event.getClientX();
      Region r = header.el().getRegion();
      int hw = splitterWidth;


      el().setY(container.el().getY());
      el().setHeight(container.getHeight());

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            }


            if (features.length() > 0) {
                // if 'special features' are set, use window.open(), unless
                // a modifier key is held (ctrl to open in new tab etc)
                Event e = DOM.eventGetCurrentEvent();
                if (!e.getCtrlKey() && !e.getAltKey() && !e.getShiftKey()
                        && !e.getMetaKey()) {
                    Window.open(src, target, features);
                    e.preventDefault();
                }
            }
        }
    }

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    }
    }
  
  protected void onContextMenu(int row) {
      if(contextMenu != null) {
          Event event = Event.getCurrentEvent();
            event.cancelBubble(true);
            event.preventDefault();
            contextMenuTarget = items.get(row);
            contextMenu.load(AsyncCallbackFactory.<Void>defaultNewInstance());
            contextMenu.showPopup(null);
      }
    }

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