Examples of com.google.gwt.event.shared.HandlerRegistration

com.google.gwt.event.shared.HandlerRegistration
Registration returned from a call to {@link HandlerManager#addHandler(com.google.gwt.event.shared.GwtEvent.Type,EventHandler)}. Use the handler registration to remove handlers when they are no longer needed. Note, this interface is under the control of the {@link HandlerManager} classand may be expanded over time, so extend {@link DefaultHandlerRegistration}if you do not wish to get compiler errors if we extend the handler registry functionality.

   */
  public void testConcurrentRemovalOfNativePreviewHandler() {
    // Add handler0
    final TestNativePreviewHandler handler0 = new TestNativePreviewHandler(
        false, false);
    final HandlerRegistration reg0 = Event.addNativePreviewHandler(handler0);


    // Add handler 1
    final TestNativePreviewHandler handler1 = new TestNativePreviewHandler(
        false, false) {
      @Override
      public void onPreviewNativeEvent(NativePreviewEvent event) {
        super.onPreviewNativeEvent(event);
        handler0.assertIsFired(false);
        reg0.removeHandler();
      }
    };
    HandlerRegistration reg1 = Event.addNativePreviewHandler(handler1);
    assertTrue(Event.fireNativePreviewEvent(null));


    // Verify both handlers fired even though one was removed
    handler0.assertIsFired(true);
    handler1.assertIsFired(true);
    reg1.removeHandler();
  }

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  public void testFireNativePreviewEventCancel() {
    TestNativePreviewHandler handler0 = new TestNativePreviewHandler(true,
        false);
    TestNativePreviewHandler handler1 = new TestNativePreviewHandler(true,
        false);
    HandlerRegistration reg0 = Event.addNativePreviewHandler(handler0);
    HandlerRegistration reg1 = Event.addNativePreviewHandler(handler1);
    assertFalse(Event.fireNativePreviewEvent(null));
    handler0.assertIsFired(true);
    handler1.assertIsFired(true);
    reg0.removeHandler();
    reg1.removeHandler();
  }

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  public void testFireNativePreviewEventPreventCancel() {
    TestNativePreviewHandler handler0 = new TestNativePreviewHandler(false,
        true);
    TestNativePreviewHandler handler1 = new TestNativePreviewHandler(true,
        false);
    HandlerRegistration reg0 = Event.addNativePreviewHandler(handler0);
    HandlerRegistration reg1 = Event.addNativePreviewHandler(handler1);
    assertTrue(Event.fireNativePreviewEvent(null));
    handler0.assertIsFired(true);
    handler1.assertIsFired(true);
    reg0.removeHandler();
    reg1.removeHandler();
  }

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        preview1.assertIsFired(true);
        assertFalse(event.isFirstHandler());
      }
    };
    DOM.addEventPreview(preview0);
    HandlerRegistration reg0 = Event.addNativePreviewHandler(handler0);
    HandlerRegistration reg1 = Event.addNativePreviewHandler(handler1);
    HandlerRegistration reg2 = Event.addNativePreviewHandler(handler2);
    HandlerRegistration reg3 = Event.addNativePreviewHandler(handler3);
    DOM.addEventPreview(preview1);
    assertTrue(DOM.previewEvent(null));
    handler0.assertIsFired(true);
    handler1.assertIsFired(true);
    handler2.assertIsFired(true);
    handler3.assertIsFired(true);
    preview0.assertIsFired(false);
    preview1.assertIsFired(true);
    reg0.removeHandler();
    reg1.removeHandler();
    reg2.removeHandler();
    reg3.removeHandler();
    DOM.removeEventPreview(preview0);
    DOM.removeEventPreview(preview1);
  }

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  public void testFireNativePreviewEventRemoval() {
    TestNativePreviewHandler handler0 = new TestNativePreviewHandler(false,
        false);
    TestNativePreviewHandler handler1 = new TestNativePreviewHandler(false,
        false);
    HandlerRegistration reg0 = Event.addNativePreviewHandler(handler0);
    HandlerRegistration reg1 = Event.addNativePreviewHandler(handler1);
    reg1.removeHandler();
    assertTrue(Event.fireNativePreviewEvent(null));
    handler0.assertIsFired(true);
    handler1.assertIsFired(false);
    reg0.removeHandler();
  }

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          assertTrue(Event.fireNativePreviewEvent(null));
          assertTrue(event.isCanceled());
        }
      }
    };
    HandlerRegistration reg = Event.addNativePreviewHandler(handler);
    assertFalse(Event.fireNativePreviewEvent(null));
    reg.removeHandler();
  }

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  public void testFireNativePreviewEventWithoutCancel() {
    TestNativePreviewHandler handler0 = new TestNativePreviewHandler(false,
        false);
    TestNativePreviewHandler handler1 = new TestNativePreviewHandler(false,
        false);
    HandlerRegistration reg0 = Event.addNativePreviewHandler(handler0);
    HandlerRegistration reg1 = Event.addNativePreviewHandler(handler1);
    assertTrue(Event.fireNativePreviewEvent(null));
    handler0.assertIsFired(true);
    handler1.assertIsFired(true);
    reg0.removeHandler();
    reg1.removeHandler();
  }

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    // Add handlers
    TestNativePreviewHandler handler0 = new TestNativePreviewHandler(false,
        false);
    TestNativePreviewHandler handler1 = new TestNativePreviewHandler(true,
        false);
    HandlerRegistration reg0 = Event.addNativePreviewHandler(handler0);
    HandlerRegistration reg1 = Event.addNativePreviewHandler(handler1);


    // Add legacy EventPreview
    TestEventPreview preview = new TestEventPreview(true);
    DOM.addEventPreview(preview);


    // Fire the event
    assertFalse(DOM.previewEvent(null));
    handler0.assertIsFired(true);
    handler1.assertIsFired(true);
    preview.assertIsFired(true);
    reg0.removeHandler();
    reg1.removeHandler();
    DOM.removeEventPreview(preview);
  }

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    // Add handlers
    TestNativePreviewHandler handler0 = new TestNativePreviewHandler(false,
        false);
    TestNativePreviewHandler handler1 = new TestNativePreviewHandler(false,
        false);
    HandlerRegistration reg0 = Event.addNativePreviewHandler(handler0);
    HandlerRegistration reg1 = Event.addNativePreviewHandler(handler1);


    // Add legacy EventPreview
    TestEventPreview preview = new TestEventPreview(true);
    DOM.addEventPreview(preview);


    // Fire the event
    assertFalse(DOM.previewEvent(null));
    handler0.assertIsFired(true);
    handler1.assertIsFired(true);
    preview.assertIsFired(true);
    reg0.removeHandler();
    reg1.removeHandler();
    DOM.removeEventPreview(preview);
  }

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    // Add handlers
    TestNativePreviewHandler handler0 = new TestNativePreviewHandler(false,
        false);
    TestNativePreviewHandler handler1 = new TestNativePreviewHandler(true,
        false);
    HandlerRegistration reg0 = Event.addNativePreviewHandler(handler0);
    HandlerRegistration reg1 = Event.addNativePreviewHandler(handler1);


    // Add legacy EventPreview
    TestEventPreview preview = new TestEventPreview(false);
    DOM.addEventPreview(preview);


    // Fire the event
    assertFalse(DOM.previewEvent(null));
    handler0.assertIsFired(true);
    handler1.assertIsFired(true);
    preview.assertIsFired(true);
    reg0.removeHandler();
    reg1.removeHandler();
    DOM.removeEventPreview(preview);
  }

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