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  3. com.google.gwt.user.client.EventListener

Java 类com.google.gwt.user.client.EventListener 实例源码

项目：gwtmvp    文件：EventManager.java    
/**
 * Sets an event handler for an {@code Element}. All previous event handlers of this type of event are removed.
 * @param element The element to bind the event handler for
 * @param eventType The event type (e.g. {@code ClickEvent.getType()})
 * @param handler The handler that handler the event
 */
public static <H extends EventHandler> void setEventHandler(final Element element, DomEvent.Type<H> eventType, H handler) {
  if (element == null) {
    return;
  }
  HandlerManager hm = handlerManagers.get(element);
  if (hm == null) {
    handlerManagers.put(element, hm = new HandlerManager(element));
    DOM.setEventListener(element, new EventListener() {
      @Override
      public void onBrowserEvent(Event event) {
        DomEvent.fireNativeEvent(event, handlerManagers.get(element), element);
      }
    });
  }
  DOM.sinkBitlessEvent(element, eventType.getName());
  while (hm.getHandlerCount(eventType) > 0) {
    hm.removeHandler(eventType, hm.getHandler(eventType, 0));
  }
  hm.addHandler(eventType, handler);
}
项目：Wiab.pro    文件：AnnotationSpreadRenderer.java    
private void updateEventHandler(final ContentElement element, String eventHandlerId) {
  Element implNodelet = element.getImplNodelet();
  final EventHandler handler =
      eventHandlerId == null ? null : AnnotationPaint.eventHandlerRegistry.get(eventHandlerId);
  if (handler != null) {
    DOM.sinkEvents(DomHelper.castToOld(implNodelet), MOUSE_LISTENER_EVENTS);
    DOM.setEventListener(DomHelper.castToOld(implNodelet), new EventListener() {
        @Override
        public void onBrowserEvent(Event event) {
          handler.onEvent(element, event);
        }
      });
  } else {
    removeListener(DomHelper.castToOld(implNodelet));
  }
}
项目：onecmdb    文件：DesktopContoller.java    
protected void addActivityTimer() {
    if (CMDBSession.get().getConfig().getDesktopLockTimeout() < 0) {
        return;
    }
    lastActivityTime = System.currentTimeMillis();

    //add event capture to detect user activity and reset idle timeout
    DOM.setEventListener(RootPanel.get().getElement(), new EventListener() {


        public void onBrowserEvent(Event event) {

            lastActivityTime = System.currentTimeMillis();
        }
    });
    DOM.sinkEvents(RootPanel.get().getElement(), Event.ONMOUSEDOWN);
}
项目：showcase    文件：SideMenu.java    
@Override
protected void onLoad() {
    super.onLoad();

    // Set page title & description
    setLayoutTitle(cons.sideMenuTitle());
    setLayoutDescription(cons.sideMenuDescription());

    // Inject layout stylesheet
    res.sideMenuLayoutCssResource().ensureInjected();

    // Bind click event to menu button
    DOM.setEventListener(menuLink, new EventListener() {

        @Override public void onBrowserEvent(Event event) {
            if (event.getTypeInt() == Event.ONCLICK) {
                toggleClass(layout.getElement(), res.sideMenuLayoutCssResource().active());
                toggleClass(menu, res.sideMenuLayoutCssResource().active());
                toggleClass(menuLink, res.sideMenuLayoutCssResource().active());
                event.preventDefault();
            }
        }
    });
    DOM.sinkEvents(menuLink, Event.ONCLICK);
}
项目：gwt-worker    文件：AbstractWorkerScopeJsoImpl.java    
@Override
public final HandlerRegistration addConnectivityHandler(final ConnectivityEvent.Handler handler) {
    EventListener el = new EventListener() {
        @Override
        public void onBrowserEvent(Event event) {
            handler.onConnectivity((ConnectivityEventJsoImpl) event.cast());
        }
    };

    final HandlerRegistration hr1 = register(this, "online", el);
    final HandlerRegistration hr2 = register(this, "offline", el);

    return new HandlerRegistration() {

        @Override
        public void removeHandler() {
            hr1.removeHandler();
            hr2.removeHandler();
        }
    };
}
项目：blogwt    文件：HeaderPart.java    
private Element convertItemToOpenable (String key, SafeHtml title) {
    activateItem(key, false);
    Element element = getItem(key);
    ensureItems().remove(key);
    element.setClassName("dropdown");
    final AnchorElement a = AnchorElement
            .as(element.getFirstChildElement());
    a.removeAttribute("href");
    Event.sinkEvents(a, Event.ONCLICK);
    Event.setEventListener(a, new EventListener() {

        @Override
        public void onBrowserEvent (Event event) {
            openableClick(a);
            event.stopPropagation();
        }
    });
    a.addClassName("dropdown-toggle");
    a.setInnerSafeHtml(title);
    Element ul = Document.get().createULElement();
    ul.addClassName("dropdown-menu");
    element.appendChild(ul);
    ensureOpenables().put(key, element);

    return element;
}
项目：appformer    文件：LockManagerImpl.java    
public EventListener acquireLockOnDemand(final Element element) {
    Event.sinkEvents(element,
                     lockDemandDetector.getLockDemandEventTypes());

    EventListener lockDemandListener = new EventListener() {

        @Override
        public void onBrowserEvent(Event event) {
            if (isLockedByCurrentUser()) {
                return;
            }

            if (lockDemandDetector.isLockRequired(event)) {
                acquireLock();
            }
        }
    };

    Event.setEventListener(element,
                           lockDemandListener);

    return lockDemandListener;
}
项目：iambookmaster    文件：Player.java    
private void addButton(String id, final Image image, VerticalPanel iconsPanel) {
    Element element = layout.getElement(id);
    image.setStyleName(STYLE_CLICKABLE);
    if (element==null) {
        image.addClickHandler(mainClickHandler);
        iconsPanel.add(image);
        iconsPanel.setCellHeight(image, "1%");
        iconsPanel.setCellWidth(image, "100%");
    } else {
        com.google.gwt.user.client.Element el = (com.google.gwt.user.client.Element) element;
        DOM.sinkEvents(el,Event.ONCLICK);
        DOM.setEventListener(el, new EventListener(){
            public void onBrowserEvent(Event event) {
                processClick(image);
            }
        });
        layout.addStyle(id, PlayerLayout.BUTTON_ON_STYLE);
    }
}
项目：iambookmaster    文件：WidgetsLine.java    
private void appendInSpan(final Widget widget, boolean wordWrap) {
    Element el = DOM.createSpan();
    Element oldEl = widget.getElement();
    DOM.setInnerHTML(el, DOM.getInnerHTML(oldEl));
    String style = widget.getStyleName();
    if (style != null && style.length()>0) {
        DOM.setElementProperty(el, "className", style);
    }
    if (wordWrap) {
        DOM.setStyleAttribute(el, "whiteSpace", "normal");
    } else {
        DOM.setStyleAttribute(el, "whiteSpace", "nowrap");
    }
    EventListener eventListener = new EventListener() {

        public void onBrowserEvent(Event event) {
            widget.onBrowserEvent(event);
        }

    };
    DOM.setEventListener(el, eventListener);
    DOM.sinkEvents(el, DOM.getEventsSunk(oldEl));
    DOM.appendChild(getElement(), el);
}
项目：OneCMDBwithMaven    文件：DesktopContoller.java    
protected void addActivityTimer() {
    if (CMDBSession.get().getConfig().getDesktopLockTimeout() < 0) {
        return;
    }
    lastActivityTime = System.currentTimeMillis();

    //add event capture to detect user activity and reset idle timeout
    DOM.setEventListener(RootPanel.get().getElement(), new EventListener() {


        public void onBrowserEvent(Event event) {

            lastActivityTime = System.currentTimeMillis();
        }
    });
    DOM.sinkEvents(RootPanel.get().getElement(), Event.ONMOUSEDOWN);
}
项目：gwt-sandbox    文件：SideMenuLayout.java    
@Override
protected void onLoad() {
    super.onLoad();

    // Set page title & description
    setLayoutTitle(cons.sideMenuTitle());
    setLayoutDescription(cons.sideMenuDescription());

    // Inject layout stylesheet
    SandboxResourceBundle.INSTANCE.sideMenuLayoutCssResource().ensureInjected();

    // Bind click event to menu button
    DOM.setEventListener(menuLink, new EventListener() {

        @Override public void onBrowserEvent(Event event) {
            if (event.getTypeInt() == Event.ONCLICK) {
                toggleClass(layout.getElement(), res.sideMenuLayoutCssResource().active());
                toggleClass(menu, res.sideMenuLayoutCssResource().active());
                toggleClass(menuLink, res.sideMenuLayoutCssResource().active());
                event.preventDefault();
            }
        }
    });
    DOM.sinkEvents(menuLink, Event.ONCLICK);
}
项目：opennmszh    文件：LoadTracker.java    
public ImageTracker(String imageUrl) {
    m_image = new Image(imageUrl);
    Event.setEventListener(m_image.getElement(), new EventListener() {

        @Override
        public void onBrowserEvent(Event event) {
            if(Event.ONLOAD == event.getTypeInt()) {
                callHandlers();
                m_loadComplete = true;
            }

        }

    });

    Element div = Document.get().getElementById(m_trackerDivId);
    div.appendChild(m_image.getElement());
    //Document.get().getBody().appendChild(m_image.getElement());
}
项目：jmini3d    文件：GpuUploader.java    
public void upload(final Renderer3d renderer3d, final Texture texture, final int activeTexture) {
    if ((texture.status & GpuObjectStatus.TEXTURE_UPLOADING) == 0) {
        texture.status |= GpuObjectStatus.TEXTURE_UPLOADING;

        Integer Integer = gl.createTexture();
        textures.put(texture, Integer);

        ImageElement textureImage = resourceLoader.getImage(texture.image);
        if (textureImage == null) {
            Window.alert("Texture image not found in resources: " + texture.image);
        } else {
            textureImages.put(texture, textureImage);

            Event.setEventListener(textureImage, new EventListener() {
                @Override
                public void onBrowserEvent(Event event) {
                    textureLoaded(renderer3d, texture, activeTexture);
                }
            });
            Event.sinkEvents(textureImage, Event.ONLOAD);
        }
    }
}
项目：jmini3d    文件：GpuUploader.java    
public void upload(final Renderer3d renderer3d, final CubeMapTexture cubeMapTexture, final int activeTexture) {
    if ((cubeMapTexture.status & GpuObjectStatus.TEXTURE_UPLOADING) == 0) {
        cubeMapTexture.status |= GpuObjectStatus.TEXTURE_UPLOADING;

        Integer texture = gl.createTexture();
        cubeMapTextures.put(cubeMapTexture, texture);

        ImageElement[] textureImages = new ImageElement[6];
        cubeMapImages.put(cubeMapTexture, textureImages);

        for (int i = 0; i < 6; i++) {
            textureImages[i] = resourceLoader.getImage(cubeMapTexture.images[i]);

            Event.setEventListener(textureImages[i], new EventListener() {
                @Override
                public void onBrowserEvent(Event event) {
                    cubeTextureLoaded(renderer3d, cubeMapTexture, activeTexture);
                }
            });
            Event.sinkEvents(textureImages[i], Event.ONLOAD);
        }
    }
}
项目：incubator-wave    文件：AnnotationSpreadRenderer.java    
private void updateEventHandler(final ContentElement element, String eventHandlerId) {
  Element implNodelet = element.getImplNodelet();
  final EventHandler handler =
      eventHandlerId == null ? null : AnnotationPaint.eventHandlerRegistry.get(eventHandlerId);
  if (handler != null) {
    DOM.sinkEvents(DomHelper.castToOld(implNodelet), MOUSE_LISTENER_EVENTS);
    DOM.setEventListener(DomHelper.castToOld(implNodelet), new EventListener() {
      @Override
      public void onBrowserEvent(Event event) {
        handler.onEvent(element, event);
      }
    });
  } else {
    removeListener(DomHelper.castToOld(implNodelet));
  }
}
项目：xapi    文件：ModuleSelectorView.java    
public void addModule(final String entered) {
  if (modules.add(entered)) {
    final Element clone = Element.as(moduleTemplate.getElement().cloneNode(true));
    clone.removeClassName(res.css().hidden());
    Element el = clone.getFirstChildElement().getNextSiblingElement();
    el.setInnerText(entered);
    com.google.gwt.user.client.Element image = el.getNextSiblingElement().cast();
    DOM.setEventListener(image, new EventListener() {
      @Override
      public void onBrowserEvent(Event event) {
        modules.remove(entered);
        clone.removeFromParent();
      }
    });
    DOM.sinkEvents(image, Event.ONCLICK | Event.ONKEYDOWN);
    selectedModules.appendChild(clone);
  }
}
项目：webcam    文件：WebcamConnector.java    
public WebcamConnector() {
    getWidget().setClickListener(new EventListener() {

        @Override
        public void onBrowserEvent(Event event) {
            // Commanded by the user clicking the client-side widget.
            captureNow();
        }
    });

    registerRpc(WebcamClientRpc.class, new WebcamClientRpc() {

        @Override
        public void capture() {
            // Commanded by the server-side component.
            captureNow();
        }
    });
}
项目：swarm    文件：DomUtils.java    
/**
 * private implementation of adding an {@link EventListener} as the recipient
 * of event dispatches for a specific event type on a specific element.
 * 
 * @param type
 * @param sourceElem
 * @param listener
 * @return
 */
private static native EventRemover addEventListenerImpl(String type,
    JavaScriptObject sourceElem, EventListener listener) /*-{
  var f = function(event) {
    listener.
    @com.google.gwt.user.client.EventListener::onBrowserEvent(Lcom/google/gwt/user/client/Event;)
    (event);
  }

  // Hang an expando that allows us to unhook this event
  f.remove = function() {
    sourceElem.removeEventListener(type,f,false);
  }

  // Register the event listener
  sourceElem.addEventListener(type,f,false);    
  return f;
}-*/;
项目：gwt-android-emu    文件：ListView.java    
private void draw() {
    while (element.getFirstChild() != null) {
        element.removeChild(element.getFirstChild());
    }

    for (int i = 0; i < mAdapter.getCount(); i++) {
        final View v = mAdapter.getView(i, null, null);
        final int index = i;
        final long id = mAdapter.getItemId(i);

        Event.setEventListener(v.getElement(), new EventListener() {
            @Override
            public void onBrowserEvent(Event event) {
                if (listener != null) {
                    listener.onItemClick(null, v, index, id);
                }
            }
        });
        Event.sinkEvents(v.getElement(), Event.ONCLICK);

        element.appendChild(v.getElement());
    }
}
项目：Cubee    文件：Image.java    
public Image(String url) {
    this(url, null, false);
    if (url == null) {
        throw new NullPointerException("The url parameter can not be null.");
    }
    final Element e = DOM.createImg();
    DOM.setEventListener((com.google.gwt.user.client.Element) e, new EventListener() {
        @Override
        public void onBrowserEvent(Event event) {
            if (event.getTypeInt() == Event.ONLOAD) {
                width = Integer.parseInt(e.getPropertyString("width"));
                height = Integer.parseInt(e.getPropertyString("height"));
                loaded = true;
                onLoad.fireEvent(new EventArgs(this));
            }
        }
    });
    DOM.sinkEvents((com.google.gwt.user.client.Element) e, Event.ONLOAD);
    DOM.setImgSrc((com.google.gwt.user.client.Element) e, url);
}
项目：VaadinGraphvizComponent    文件：VizComponentWidget.java    
private void addClickHandler(Set<String> ids, final VizClickHandler handler) {
    for (String nodeId : ids) {
        Element svgNode = DOM.getElementById(nodeId);
        Event.sinkEvents(svgNode, Event.ONCLICK);
        Event.setEventListener(svgNode, new EventListener() {

            @Override
            public void onBrowserEvent(Event event) {
                handler.onClick(event);
            }
        });
    }
}
项目：gerrit    文件：UnifiedChunkManager.java    
private static void focus(NativeEvent event) {
  Element e = Element.as(event.getEventTarget());
  for (e = DOM.getParent(e); e != null; e = DOM.getParent(e)) {
    EventListener l = DOM.getEventListener(e);
    if (l instanceof Unified) {
      ((Unified) l).getCmFromSide(DisplaySide.A).focus();
      event.stopPropagation();
    }
  }
}
项目：gerrit    文件：SideBySideChunkManager.java    
private static void focus(NativeEvent event, DisplaySide side) {
  Element e = Element.as(event.getEventTarget());
  for (e = DOM.getParent(e); e != null; e = DOM.getParent(e)) {
    EventListener l = DOM.getEventListener(e);
    if (l instanceof SideBySide) {
      ((SideBySide) l).getCmFromSide(side).focus();
      event.stopPropagation();
    }
  }
}
项目：gerrit    文件：Assignee.java    
private Reviewers getReviewers() {
  Element e = DOM.getParent(getElement());
  for (e = DOM.getParent(e); e != null; e = DOM.getParent(e)) {
    EventListener l = DOM.getEventListener(e);
    if (l instanceof ChangeScreen) {
      ChangeScreen screen = (ChangeScreen) l;
      return screen.reviewers;
    }
  }
  return null;
}
项目：gerrit    文件：ChangeScreen.java    
static ChangeScreen get(NativeEvent in) {
  Element e = in.getEventTarget().cast();
  for (e = DOM.getParent(e); e != null; e = DOM.getParent(e)) {
    EventListener l = DOM.getEventListener(e);
    if (l instanceof ChangeScreen) {
      return (ChangeScreen) l;
    }
  }
  return null;
}
项目：gerrit    文件：PatchSetsBox.java    
private static PatchSetsBox getRevisionBox(NativeEvent event) {
  Element e = event.getEventTarget().cast();
  for (e = DOM.getParent(e); e != null; e = DOM.getParent(e)) {
    EventListener l = DOM.getEventListener(e);
    if (l instanceof PatchSetsBox) {
      return (PatchSetsBox) l;
    }
  }
  return null;
}
项目：gerrit    文件：FileTable.java    
private static MyTable getMyTable(NativeEvent event) {
  Element e = event.getEventTarget().cast();
  for (e = DOM.getParent(e); e != null; e = DOM.getParent(e)) {
    EventListener l = DOM.getEventListener(e);
    if (l instanceof MyTable) {
      return (MyTable) l;
    }
  }
  return null;
}
项目：djvu-html5    文件：DjVuPage.java    
private GPixmap decodeJPEG(CachedInputStream iff) throws IOException {
    final GPixmap result = new GPixmap();

    final Image image = new Image();
    final ImageElement imageElement = image.getElement().cast();
    imageElement.getStyle().setProperty("visibility", "hidden");
    Event.setEventListener(imageElement, new EventListener() {
        @Override
        public void onBrowserEvent(Event event) {
            if (Event.ONLOAD == event.getTypeInt()) {
                final int w = imageElement.getWidth(), h = imageElement.getHeight();
                final Canvas canvas = Canvas.createIfSupported();
                canvas.setWidth(w + "px");
                canvas.setCoordinateSpaceWidth(w);
                canvas.setHeight(h + "px");
                canvas.setCoordinateSpaceHeight(h);
                canvas.getContext2d().drawImage(imageElement, 0, 0);

                result.init(h, w, null);
                //TODO result.setImageData(canvas.getContext2d().getImageData(0, 0, w, h));
            }
        }
    });

    StringBuilder data = new StringBuilder();
    int b;
    while ((b = iff.read()) != -1) {
        data.append((char) b);
    }
    String dataURL = "data:image/jpeg;base64," + btoa(data.toString());
    image.setUrl(dataURL);

    return result;
}
项目：gwt-worker    文件：AbstractWorkerJsoImpl.java    
@Override
public final HandlerRegistration addErrorHandler(final ErrorEvent.Handler handler) {
    return register(this, "error", new EventListener() {
        @Override
        public void onBrowserEvent(Event event) {
            handler.onError((ErrorEventJsoImpl) event.cast());
        }
    });
}
项目：gwt-worker    文件：AbstractWorkerScopeJsoImpl.java    
@Override
public final HandlerRegistration addErrorHandler(final ErrorEvent.Handler handler) {
    return register(this, "error", new EventListener() {
        @Override
        public void onBrowserEvent(Event event) {
            handler.onError((ErrorEventJsoImpl) event.cast());
        }
    });
}
项目：gwt-worker    文件：AbstractWorkerScopeJsoImpl.java    
@Override
public final HandlerRegistration addLanguageChangeHandler(final LanguageChangeEvent.Handler handler) {
    return register(this, "languagechange", new EventListener() {
        @Override
        public void onBrowserEvent(Event event) {
            handler.onLanguageChange((LanguageChangeEventJsoImpl) event.cast());
        }
    });
}
项目：gwt-worker    文件：MessagePortRefJsoImpl.java    
@Override
public final HandlerRegistration addMessageHandler(final MessageHandler handler) {
    return register(this, "message", new EventListener() {
        @Override
        public void onBrowserEvent(Event event) {
            handler.onMessage((MessageEventJsoImpl) event.cast());
        }
    });
}
项目：gwt-worker    文件：SharedWorkerScopeJsoImpl.java    
@Override
public final HandlerRegistration addConnectHandler(final ConnectHandler handler) {
    return register(this, "connect", new EventListener() {
        @Override
        public void onBrowserEvent(Event event) {
            handler.onConnect((MessageEventJsoImpl) event.cast());
        }
    });
}
项目：blogwt    文件：HeaderPart.java    
private Element addOpenable (Element parent, SafeHtml title, SafeUri href) {
    String key = href.asString().replaceFirst("#", "");
    final Element got;
    final Element element = (got = getOpenable(key)) == null
            ? Document.get().createLIElement()
            : got;

    element.setClassName("dropdown");
    parent.appendChild(element);

    final Element a = Document.get().createAnchorElement();
    element.appendChild(a);
    Event.sinkEvents(a, Event.ONCLICK);
    Event.setEventListener(a, new EventListener() {

        @Override
        public void onBrowserEvent (Event event) {
            openableClick(a);
            event.stopPropagation();
        }
    });

    a.addClassName("dropdown-toggle");
    a.setInnerSafeHtml(title);
    Element ul = Document.get().createULElement();
    ul.addClassName("dropdown-menu");
    element.appendChild(ul);
    ensureOpenables().put(key, element);

    return element;
}
项目：iambookmaster    文件：TrueStackPanel.java    
public void setStackHeader(int row, String name, String icon_url, String title,EventListener sortListener) {
    StringBuffer buffer = new StringBuffer();
    buffer.append("<div class=\"notes_panel_header_left\">");
    buffer.append("<div class=\"notes_panel_header_right\" >");
    buffer.append("<div class=\"notes_panel_header_inside\">");
    buffer.append("<img src=\"");
    buffer.append(icon_url);
    buffer.append("\"/>");
    buffer.append(name);
    if (sortListener != null) {
        buffer.append("<img src=\"");
        buffer.append(Images.SORT);
        buffer.append("\" title=\"");
        buffer.append(AppLocale.getAppConstants().sort());
        buffer.append("\"/>");
    }
    buffer.append("</div></div></div>");

    setStackText(row, buffer.toString(), true);
    Element wrapper = getHeaderWrapper(row);
    if (sortListener != null) {
        Element tdWrapper = DOM.getChild(wrapper, 0);
        tdWrapper = DOM.getChild(tdWrapper,0);
        tdWrapper = DOM.getChild(tdWrapper,0);
        tdWrapper = DOM.getChild(tdWrapper,0);
        tdWrapper = DOM.getChild(tdWrapper,1);
        DOM.sinkEvents(tdWrapper,Event.ONCLICK);
        DOM.setEventListener(tdWrapper, sortListener);
    }
    DOM.setStyleAttribute(wrapper, "height", "20px");
    setTitle(row, title);

    selectHeader(row, false);
}
项目：swarm    文件：ControlBar.java    
/**
 * Creates a control styled by a specified CSS class selector name. Performs
 * the inputed action on click.
 *
 * @param cssClassName
 * @param action
 */
public void addControl(String cssClassName, EventListener action) {
  DivElement control = Document.get().createDivElement();
  control.setClassName(resources.controlBarCss().control() + " "
      + cssClassName);
  DomUtils.addEventListener("click", control, action);
  controls.add(control);
}
项目：swarm    文件：PageTransitionPanel.java    
/**
 * Attaches an EventListener to the resize event on the Window.
 */
private void hookResizeListener() {
  DomUtils.getWindow().addResizeListener(new EventListener() {
    public void onBrowserEvent(Event event) {
      doResize();
    }
  });
}
项目：swarm    文件：TaskDetails.java    
/**
 * Creates the controls to be added to a TaskDetails.
 */
public static Controls createControls(final Controller controller,
    TaskDetails.Resources resources) {
  TaskDetails.Css css = resources.taskDetailsCss();

  Controls controls = new Controls(resources);
  controls.addControl(css.back(), new EventListener() {
    public void onBrowserEvent(Event event) {
      controller.goToTaskList();
    }
  });

  return controls;
}
项目：consulo    文件：GwtUIUtil.java    
public static Widget getWidget(Element element) {
  EventListener listener = DOM.getEventListener(element);

  if (listener == null) {
    return null;
  }
  if (listener instanceof Widget) {
    return (Widget)listener;
  }
  return null;
}