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

com.google.gwt.user.client.Event
An opaque handle to a native DOM Event. An Event cannot be created directly. Instead, use the Event type when returning a native DOM event from JSNI methods. An Event passed back into JSNI becomes the original DOM event the Event was created from, and can be accessed in JavaScript code as expected. This is typically done by calling methods in the {@link com.google.gwt.user.client.DOM} class.

    /**
     * Show the popup at the current mouse position.  Assumes a mouse event
     * is currently being processed.
     */
    protected void showPopup(AsyncCallback<Void> callback) {
        Event event = Event.getCurrentEvent();
        showPopup(callback, event.getClientX()+Window.getScrollLeft(), event.getClientY()+Window.getScrollTop());
    }

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      protected void onPreviewNativeEvent( final NativePreviewEvent event ) {
        // Switch on the event type
        int type = event.getTypeInt();
        switch ( type ) {
          case Event.ONKEYDOWN: {
            Event nativeEvent = Event.as( event.getNativeEvent() );
            if ( (char) nativeEvent.getKeyCode() == KeyCodes.KEY_ESCAPE ) {
              event.cancel();
              hide();
            }
            return;
          }

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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:
      case Event.ONTOUCHSTART:
        // 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:
      case Event.ONTOUCHEND: {
        // 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 (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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    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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  public void testOnBrowserEvent() {
    CustomCell cell = new CustomCell();
    CellWidget<String> cw = new CellWidget<String>(cell, "test");
    assertEquals("test", cw.getValue());


    Event event = Document.get().createChangeEvent().cast();
    cw.onBrowserEvent(event);
    cell.assertLastEventKey("test");
    cell.assertLastEventValue("test");
    assertEquals("newValue", cw.getValue());
  }

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    CustomCell cell = new CustomCell();
    final CellWidget<String> cw = new CellWidget<String>(cell, "test", keyProvider);
    assertEquals("test", cw.getValue());
    assertEquals(keyProvider, cw.getKeyProvider());


    Event event = Document.get().createChangeEvent().cast();
    cw.onBrowserEvent(event);
    cell.assertLastEventKey("t");
    cell.assertLastEventValue("test");
    assertEquals("newValue", cw.getValue());
  }

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    // Add a ValueChangeHandler.
    MockValueChangeHandler<String> handler = new MockValueChangeHandler<String>();
    cw.addValueChangeHandler(handler);


    // Fire an native event that will trigger a value change event.
    Event event = Document.get().createChangeEvent().cast();
    cw.onBrowserEvent(event);
    cell.assertLastEventKey("test");
    cell.assertLastEventValue("test");
    handler.assertLastValue("newValue");
    assertEquals("newValue", cw.getValue());

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      // Fire a change event on the input element if the value changed.
      maybeFireChangeEvent(widget);
      focusedInput = null;


      // The blur event has already fired, so we need to synthesize one.
      Event blurEvent = Document.get().createFocusEvent().cast();
      dispatchCellEvent(widget, target, Event.ONBLUR, null);
    } else if (BrowserEvents.LOAD.equals(type) || BrowserEvents.ERROR.equals(type)) {
      DOM.dispatchEvent(event, widget.getElement(), listener);
    }
  }

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      // Save the new value in case it changes again.
      focusedInputValue = newValue;


      // Fire a synthetic event to the input element.
      Element target = focusedInput;
      Event changeEvent = Document.get().createChangeEvent().cast();
      dispatchCellEvent(widget, target, Event.ONCHANGE, changeEvent);
    }
  }

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