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/*
* Copyright 2008 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.google.gwt.user.client.ui;
import com.google.gwt.dom.client.Element;
import com.google.gwt.event.dom.client.BlurEvent;
import com.google.gwt.event.dom.client.BlurHandler;
import com.google.gwt.event.dom.client.ChangeEvent;
import com.google.gwt.event.dom.client.ChangeHandler;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.dom.client.ErrorEvent;
import com.google.gwt.event.dom.client.ErrorHandler;
import com.google.gwt.event.dom.client.FocusEvent;
import com.google.gwt.event.dom.client.FocusHandler;
import com.google.gwt.event.dom.client.HandlesAllFocusEvents;
import com.google.gwt.event.dom.client.HandlesAllKeyEvents;
import com.google.gwt.event.dom.client.HasAllFocusHandlers;
import com.google.gwt.event.dom.client.HasAllKeyHandlers;
import com.google.gwt.event.dom.client.HasChangeHandlers;
import com.google.gwt.event.dom.client.HasClickHandlers;
import com.google.gwt.event.dom.client.HasErrorHandlers;
import com.google.gwt.event.dom.client.HasLoadHandlers;
import com.google.gwt.event.dom.client.HasMouseDownHandlers;
import com.google.gwt.event.dom.client.HasMouseMoveHandlers;
import com.google.gwt.event.dom.client.HasMouseOutHandlers;
import com.google.gwt.event.dom.client.HasMouseOverHandlers;
import com.google.gwt.event.dom.client.HasMouseUpHandlers;
import com.google.gwt.event.dom.client.HasMouseWheelHandlers;
import com.google.gwt.event.dom.client.HasScrollHandlers;
import com.google.gwt.event.dom.client.KeyDownEvent;
import com.google.gwt.event.dom.client.KeyDownHandler;
import com.google.gwt.event.dom.client.KeyPressEvent;
import com.google.gwt.event.dom.client.KeyPressHandler;
import com.google.gwt.event.dom.client.KeyUpEvent;
import com.google.gwt.event.dom.client.KeyUpHandler;
import com.google.gwt.event.dom.client.LoadEvent;
import com.google.gwt.event.dom.client.LoadHandler;
import com.google.gwt.event.dom.client.MouseDownEvent;
import com.google.gwt.event.dom.client.MouseDownHandler;
import com.google.gwt.event.dom.client.MouseMoveEvent;
import com.google.gwt.event.dom.client.MouseMoveHandler;
import com.google.gwt.event.dom.client.MouseOutEvent;
import com.google.gwt.event.dom.client.MouseOutHandler;
import com.google.gwt.event.dom.client.MouseOverEvent;
import com.google.gwt.event.dom.client.MouseOverHandler;
import com.google.gwt.event.dom.client.MouseUpEvent;
import com.google.gwt.event.dom.client.MouseUpHandler;
import com.google.gwt.event.dom.client.MouseWheelEvent;
import com.google.gwt.event.dom.client.MouseWheelHandler;
import com.google.gwt.event.dom.client.ScrollEvent;
import com.google.gwt.event.dom.client.ScrollHandler;
import com.google.gwt.event.logical.shared.BeforeSelectionEvent;
import com.google.gwt.event.logical.shared.BeforeSelectionHandler;
import com.google.gwt.event.logical.shared.CloseEvent;
import com.google.gwt.event.logical.shared.CloseHandler;
import com.google.gwt.event.logical.shared.HasCloseHandlers;
import com.google.gwt.event.logical.shared.HasValueChangeHandlers;
import com.google.gwt.event.logical.shared.OpenEvent;
import com.google.gwt.event.logical.shared.OpenHandler;
import com.google.gwt.event.logical.shared.SelectionEvent;
import com.google.gwt.event.logical.shared.SelectionHandler;
import com.google.gwt.event.logical.shared.ValueChangeEvent;
import com.google.gwt.event.logical.shared.ValueChangeHandler;
import com.google.gwt.event.shared.EventHandler;
import com.google.gwt.event.shared.GwtEvent;
import com.google.gwt.event.shared.GwtEvent.Type;
import com.google.gwt.event.shared.HandlerManager;
import com.google.gwt.user.client.BaseListenerWrapper;
import com.google.gwt.user.client.Event;
import java.util.EventListener;
/**
* Legacy listener support hierarchy for
* com.google.gwt.user.client.ui. Gathers the bulk of the legacy
* glue code in one place, for easy deletion when Listener methods are deleted.
*
*
* @param listener type
* @deprecated will be removed in GWT 2.7 with the handler listeners themselves
*/
@Deprecated
public abstract class ListenerWrapper extends BaseListenerWrapper {
/**
* Wrapper for a {@link LoadListener}.
*/
public static class WrappedLoadListener extends ListenerWrapper
implements LoadHandler, ErrorHandler {
/**
* Adds the wrapped listener.
*
* @param the source of the events
*
* @param source the event source
* @param listener the listener
* @return the wrapped listener
*
* @deprecated will be removed in GWT 2.0 along with the listener classes
*/
@Deprecated
public static WrappedLoadListener add(
S source, LoadListener listener) {
WrappedLoadListener l = new WrappedLoadListener(listener);
source.addLoadHandler(l);
source.addErrorHandler(l);
return l;
}
/**
* Removes the wrapped listener.
*
* @param eventSource the event source from which to remove the wrapped
* listener
* @param listener the listener to remove
* @deprecated will be removed in GWT 2.0 along with the listener classes
*/
@Deprecated
public static void remove(Widget eventSource, LoadListener listener) {
baseRemove(eventSource, listener, LoadEvent.getType(),
ErrorEvent.getType());
}
private WrappedLoadListener(LoadListener listener) {
super(listener);
}
public void onError(ErrorEvent event) {
getListener().onError(getSource(event));
}
public void onLoad(LoadEvent event) {
getListener().onLoad(getSource(event));
}
}
/**
* Wrapper for a {@link ChangeListener}.
*
* @deprecated will be removed in GWT 2.0 along with the listeners being
* wrapped
*/
@Deprecated
public static class WrappedChangeListener extends
ListenerWrapper implements ChangeHandler {
/**
* Adds the wrapped listener.
*
* @param source the event source
* @param listener the listener
* @return the wrapped listener
*
* @deprecated will be removed in GWT 2.0 along with the listener classes
*/
@Deprecated
public static WrappedChangeListener add(HasChangeHandlers source,
ChangeListener listener) {
WrappedChangeListener rtn = new WrappedChangeListener(listener);
source.addChangeHandler(rtn);
return rtn;
}
/**
* Removes the wrapped listener.
*
* @param eventSource the event source from which to remove the wrapped
* listener
* @param listener the listener to remove
* @deprecated will be removed in GWT 2.0 along with the listener classes
*/
@Deprecated
public static void remove(Widget eventSource, ChangeListener listener) {
baseRemove(eventSource, listener, ChangeEvent.getType());
}
WrappedChangeListener(ChangeListener listener) {
super(listener);
}
public void onChange(ChangeEvent event) {
getListener().onChange(getSource(event));
}
}
/**
* Wrapper for a {@link ClickListener}.
*
* @deprecated will be removed in GWT 2.0 along with the listeners being
* wrapped
*/
@Deprecated
public static class WrappedClickListener extends
ListenerWrapper implements ClickHandler {
/**
* Adds the wrapped listener.
*
* @param source the event source
* @param listener the listener
* @return the wrapped listener
*
* @deprecated will be removed in GWT 2.0 along with the listener classes
*/
@Deprecated
public static WrappedClickListener add(HasClickHandlers source,
ClickListener listener) {
WrappedClickListener rtn = new WrappedClickListener(listener);
source.addClickHandler(rtn);
return rtn;
}
/**
* Removes the wrapped listener.
*
* @param eventSource the event source from which to remove the wrapped
* listener
* @param listener the listener to remove
* @deprecated will be removed in GWT 2.0 along with the listener classes
*/
@Deprecated
public static void remove(Widget eventSource, ClickListener listener) {
baseRemove(eventSource, listener, ClickEvent.getType());
}
private WrappedClickListener(ClickListener listener) {
super(listener);
}
public void onClick(ClickEvent event) {
getListener().onClick(getSource(event));
}
}
/**
* Wrapper for a {@link FocusListener}.
*/
public static class WrappedFocusListener extends
ListenerWrapper implements FocusHandler, BlurHandler {
/**
* Adds the wrapped listener.
*
* @param eventSource the event source
* @param listener the listener
*
* @return the wrapped listener
*
* @deprecated will be removed in GWT 2.0 along with the listener classes
*/
@Deprecated
public static WrappedFocusListener add(HasAllFocusHandlers eventSource,
FocusListener listener) {
WrappedFocusListener rtn = new WrappedFocusListener(listener);
HandlesAllFocusEvents.handle(eventSource, rtn);
return rtn;
}
/**
* Removes the wrapped listener.
*
* @param eventSource the event source from which to remove the wrapped
* listener
* @param listener the listener to remove
* @deprecated will be removed in GWT 2.0 along with the listener classes
*/
@Deprecated
public static void remove(Widget eventSource, FocusListener listener) {
baseRemove(eventSource, listener, LoadEvent.getType(),
ErrorEvent.getType());
}
private WrappedFocusListener(FocusListener listener) {
super(listener);
}
public void onBlur(BlurEvent event) {
getListener().onLostFocus(getSource(event));
}
public void onFocus(FocusEvent event) {
getListener().onFocus(getSource(event));
}
}
/**
* Wrapper for a {@link KeyboardListener}.
*/
public static class WrappedKeyboardListener extends
ListenerWrapper implements KeyDownHandler,
KeyUpHandler, KeyPressHandler {
/**
* Adds the wrapped listener.
*
* @param source the event source
* @param listener the listener
* @return the wrapped listener
*
* @deprecated will be removed in GWT 2.0 along with the listener classes
*/
@Deprecated
public static WrappedKeyboardListener add(HasAllKeyHandlers source,
KeyboardListener listener) {
WrappedKeyboardListener b = new WrappedKeyboardListener(listener);
HandlesAllKeyEvents.addHandlers(source, b);
return b;
}
/**
* Removes the wrapped listener.
*
* @param eventSource the event source from which to remove the wrapped
* listener
* @param listener the listener to remove
* @deprecated will be removed in GWT 2.0 along with the listener classes
*/
@Deprecated
public static void remove(Widget eventSource, KeyboardListener listener) {
ListenerWrapper.baseRemove(eventSource, listener, KeyDownEvent.getType(),
KeyUpEvent.getType(), KeyPressEvent.getType());
}
private WrappedKeyboardListener(KeyboardListener listener) {
super(listener);
}
public void onKeyDown(KeyDownEvent event) {
getListener().onKeyDown(
getSource(event),
(char) event.getNativeKeyCode(),
KeyboardListenerCollection.getKeyboardModifiers(Event.as(event.getNativeEvent())));
}
public void onKeyPress(KeyPressEvent event) {
getListener().onKeyPress(
getSource(event),
(char) event.getNativeEvent().getKeyCode(),
KeyboardListenerCollection.getKeyboardModifiers(Event.as(event.getNativeEvent())));
}
public void onKeyUp(KeyUpEvent event) {
getSource(event);
getListener().onKeyUp(
getSource(event),
(char) event.getNativeKeyCode(),
KeyboardListenerCollection.getKeyboardModifiers(Event.as(event.getNativeEvent())));
}
}
/**
* Wrapper for a {@link ChangeListener} being converted to a logical
* {@link ValueChangeHandler}.
*
* @param the type of the value changed
*
* @deprecated will be removed in GWT 2.0 along with the listeners being
* wrapped
*/
@Deprecated
public static class WrappedLogicalChangeListener extends
ListenerWrapper implements ValueChangeHandler {
/**
* Adds the wrapped listener.
*
* @param the type of value changed
*
* @param source the event source
* @param listener the listener
* @return the wrapped listener
*
* @deprecated will be removed in GWT 2.0 along with the listener classes
*/
@Deprecated
public static WrappedLogicalChangeListener add(
HasValueChangeHandlers source, ChangeListener listener) {
WrappedLogicalChangeListener rtn = new WrappedLogicalChangeListener(
listener);
source.addValueChangeHandler(rtn);
return rtn;
}
/**
* Removes the wrapped listener.
*
* @param eventSource the event source from which to remove the wrapped
* listener
* @param listener the listener to remove
* @deprecated will be removed in GWT 2.0 along with the listener classes
*/
@Deprecated
public static void remove(Widget eventSource, ChangeListener listener) {
baseRemove(eventSource, listener, ValueChangeEvent.getType());
}
private WrappedLogicalChangeListener(ChangeListener listener) {
super(listener);
}
public void onValueChange(ValueChangeEvent event) {
getListener().onChange(getSource(event));
}
}
/**
* Wrapper for a {@link MouseListener}.
*/
public static class WrappedMouseListener extends
ListenerWrapper implements MouseDownHandler,
MouseUpHandler, MouseOutHandler, MouseOverHandler, MouseMoveHandler {
/**
* Adds the wrapped listener.
*
* @param source the event source
* @param listener the listener
* @return the wrapped listener
* @param source of the handlers
* @deprecated will be removed in GWT 2.0 along with the listener classes
*/
@Deprecated
public static WrappedMouseListener add(
E source, MouseListener listener) {
WrappedMouseListener handlers = new WrappedMouseListener(listener);
source.addMouseDownHandler(handlers);
source.addMouseUpHandler(handlers);
source.addMouseOutHandler(handlers);
source.addMouseOverHandler(handlers);
source.addMouseMoveHandler(handlers);
return handlers;
}
/**
* Removes the wrapped listener.
*
* @param eventSource the event source from which to remove the wrapped
* listener
* @param listener the listener to remove
* @deprecated will be removed in GWT 2.0 along with the listener classes
*/
@Deprecated
public static void remove(Widget eventSource, MouseListener listener) {
baseRemove(eventSource, listener, MouseDownEvent.getType(),
MouseUpEvent.getType(), MouseOverEvent.getType(),
MouseOutEvent.getType());
}
private WrappedMouseListener(MouseListener listener) {
super(listener);
}
public void onMouseDown(MouseDownEvent event) {
Widget source = getSource(event);
getListener().onMouseDown(source, event.getX(), event.getY());
}
public void onMouseMove(MouseMoveEvent event) {
Widget source = getSource(event);
getListener().onMouseMove(source, event.getX(), event.getY());
}
public void onMouseOut(MouseOutEvent event) {
getListener().onMouseLeave(getSource(event));
}
public void onMouseOver(MouseOverEvent event) {
getListener().onMouseEnter(getSource(event));
}
public void onMouseUp(MouseUpEvent event) {
Widget source = getSource(event);
getListener().onMouseUp(source, event.getX(), event.getY());
}
}
/**
* Wrapper for a {@link MouseWheelListener}.
*/
public static class WrappedMouseWheelListener extends
ListenerWrapper implements MouseWheelHandler {
/**
* Adds the wrapped listener.
*
* @param source the event source
* @param listener the listener
* @return the wrapped listener
*
* @deprecated will be removed in GWT 2.0 along with the listener classes
*/
@Deprecated
public static WrappedMouseWheelListener add(HasMouseWheelHandlers source,
MouseWheelListener listener) {
WrappedMouseWheelListener wrap = new WrappedMouseWheelListener(listener);
source.addMouseWheelHandler(new WrappedMouseWheelListener(listener));
return wrap;
}
/**
* Removes the wrapped listener.
*
* @param eventSource the event source from which to remove the wrapped
* listener
* @param listener the listener to remove
* @deprecated will be removed in GWT 2.0 along with the listener classes
*/
@Deprecated
public static void remove(Widget eventSource, MouseWheelListener listener) {
baseRemove(eventSource, listener, MouseWheelEvent.getType());
}
private WrappedMouseWheelListener(MouseWheelListener listener) {
super(listener);
}
public void onMouseWheel(MouseWheelEvent event) {
getListener().onMouseWheel(getSource(event),
new MouseWheelVelocity(Event.as(event.getNativeEvent())));
}
}
/**
* Wrapper for a {@link ScrollListener}.
*/
public static class WrappedScrollListener extends
ListenerWrapper implements ScrollHandler {
/**
* Adds the wrapped listener.
*
* @param source the event source
* @param listener the listener
* @return the wrapped listener
*
* @deprecated will be removed in GWT 2.0 along with the listener classes
*/
@Deprecated
public static WrappedScrollListener add(HasScrollHandlers source,
ScrollListener listener) {
WrappedScrollListener s = new WrappedScrollListener(listener);
source.addScrollHandler(s);
return s;
}
/**
* Removes the wrapped listener.
*
* @param eventSource the event source from which to remove the wrapped
* listener
* @param listener the listener to remove
* @deprecated will be removed in GWT 2.0 along with the listener classes
*/
@Deprecated
public static void remove(Widget eventSource, ScrollListener listener) {
baseRemove(eventSource, listener, ScrollEvent.getType(),
ErrorEvent.getType());
}
private WrappedScrollListener(ScrollListener listener) {
super(listener);
}
public void onScroll(ScrollEvent event) {
Widget source = getSource(event);
Element elem = source.getElement();
getListener().onScroll(getSource(event), elem.getScrollLeft(),
elem.getScrollTop());
}
}
static class WrappedOldDisclosureHandler extends
ListenerWrapper implements
CloseHandler, OpenHandler {
public static void add(DisclosurePanel source, DisclosureHandler listener) {
WrappedOldDisclosureHandler handlers = new WrappedOldDisclosureHandler(
listener);
source.addOpenHandler(handlers);
source.addCloseHandler(handlers);
}
public static void remove(Widget eventSource, DisclosureHandler listener) {
baseRemove(eventSource, listener, CloseEvent.getType(),
OpenEvent.getType());
}
private WrappedOldDisclosureHandler(DisclosureHandler listener) {
super(listener);
}
public void onClose(CloseEvent event) {
getListener().onClose(
new DisclosureEvent((DisclosurePanel) event.getSource()));
}
public void onOpen(OpenEvent event) {
getListener().onOpen(
new DisclosureEvent((DisclosurePanel) event.getSource()));
}
}
static class WrappedOldFormHandler extends ListenerWrapper
implements FormPanel.SubmitHandler, FormPanel.SubmitCompleteHandler {
public static void add(FormPanel source, FormHandler listener) {
WrappedOldFormHandler handlers = new WrappedOldFormHandler(listener);
source.addSubmitHandler(handlers);
source.addSubmitCompleteHandler(handlers);
}
public static void remove(Widget eventSource, FormHandler listener) {
baseRemove(eventSource, listener, FormPanel.SubmitEvent.getType(),
FormPanel.SubmitCompleteEvent.getType());
}
private WrappedOldFormHandler(FormHandler listener) {
super(listener);
}
public void onSubmit(FormPanel.SubmitEvent event) {
FormSubmitEvent fse = new FormSubmitEvent((FormPanel) event.getSource());
getListener().onSubmit(fse);
if (fse.isSetCancelledCalled()) {
event.setCanceled(fse.isCancelled());
}
}
public void onSubmitComplete(FormPanel.SubmitCompleteEvent event) {
getListener().onSubmitComplete(
new FormSubmitCompleteEvent((FormPanel) event.getSource(),
event.getResults()));
}
}
static class WrappedOldSuggestionHandler extends
ListenerWrapper implements
SelectionHandler {
/**
* @deprecated will be removed in GWT 2.0 along with the listener classes
*/
@Deprecated
public static void add(SuggestBox source, SuggestionHandler listener) {
source.addSelectionHandler(new WrappedOldSuggestionHandler(listener));
}
public static void remove(Widget eventSource, SuggestionHandler listener) {
baseRemove(eventSource, listener, SelectionEvent.getType());
}
private WrappedOldSuggestionHandler(SuggestionHandler listener) {
super(listener);
}
public void onSelection(SelectionEvent event) {
getListener().onSuggestionSelected(
new SuggestionEvent((SuggestBox) event.getSource(),
event.getSelectedItem()));
}
}
static class WrappedPopupListener extends ListenerWrapper
implements CloseHandler {
public static void add(HasCloseHandlers source,
PopupListener listener) {
source.addCloseHandler(new WrappedPopupListener(listener));
}
public static void remove(Widget eventSource, PopupListener listener) {
baseRemove(eventSource, listener, CloseEvent.getType());
}
private WrappedPopupListener(PopupListener listener) {
super(listener);
}
public void onClose(CloseEvent event) {
getListener().onPopupClosed((PopupPanel) event.getSource(),
event.isAutoClosed());
}
}
static class WrappedTableListener extends ListenerWrapper
implements ClickHandler {
/**
* @deprecated will be removed in GWT 2.0 along with the listener classes
*/
@Deprecated
public static void add(HasClickHandlers source, TableListener listener) {
source.addClickHandler(new WrappedTableListener(listener));
}
public static void remove(Widget eventSource, TableListener listener) {
baseRemove(eventSource, listener, ClickEvent.getType());
}
private WrappedTableListener(TableListener listener) {
super(listener);
}
public void onClick(ClickEvent event) {
HTMLTable table = (HTMLTable) event.getSource();
HTMLTable.Cell cell = table.getCellForEvent(event);
if (cell != null) {
getListener().onCellClicked(table, cell.getRowIndex(),
cell.getCellIndex());
}
}
}
static class WrappedTabListener extends ListenerWrapper
implements SelectionHandler, BeforeSelectionHandler {
/**
* @deprecated will be removed in GWT 2.0 along with the listener classes
*/
@Deprecated
public static void add(TabBar source, TabListener listener) {
WrappedTabListener t = new WrappedTabListener(listener);
source.addBeforeSelectionHandler(t);
source.addSelectionHandler(t);
}
public static void add(TabPanel source, TabListener listener) {
WrappedTabListener t = new WrappedTabListener(listener);
source.addBeforeSelectionHandler(t);
source.addSelectionHandler(t);
}
public static void remove(Widget eventSource, TabListener listener) {
baseRemove(eventSource, listener, SelectionEvent.getType(),
BeforeSelectionEvent.getType());
}
private WrappedTabListener(TabListener listener) {
super(listener);
}
public void onBeforeSelection(BeforeSelectionEvent event) {
if (!getListener().onBeforeTabSelected(
(SourcesTabEvents) event.getSource(), event.getItem().intValue())) {
event.cancel();
}
}
public void onSelection(SelectionEvent event) {
getListener().onTabSelected((SourcesTabEvents) event.getSource(),
event.getSelectedItem().intValue());
}
}
static class WrappedTreeListener extends ListenerWrapper
implements SelectionHandler, CloseHandler,
OpenHandler {
/**
* @deprecated will be removed in GWT 2.0 along with the listener classes
*/
@Deprecated
public static void add(com.google.gwt.user.client.ui.Tree tree,
TreeListener listener) {
WrappedTreeListener t = new WrappedTreeListener(listener);
tree.addSelectionHandler(t);
tree.addCloseHandler(t);
tree.addOpenHandler(t);
}
public static void remove(Widget eventSource, TreeListener listener) {
baseRemove(eventSource, listener, ValueChangeEvent.getType());
}
private WrappedTreeListener(TreeListener listener) {
super(listener);
}
public void onClose(CloseEvent event) {
getListener().onTreeItemStateChanged(event.getTarget());
}
public void onOpen(OpenEvent event) {
getListener().onTreeItemStateChanged(event.getTarget());
}
public void onSelection(SelectionEvent event) {
getListener().onTreeItemSelected(event.getSelectedItem());
}
}
/**
* Convenience method to remove wrapped handlers from a widget.
*
* @param event handler type
* @param eventSource the event source
* @param listener the listener to remove
* @param types the event types to remove it from
*/
// This is an internal helper method with the current formulation, we have
// lost the info needed to make it safe by this point.
@SuppressWarnings("rawtypes")
protected static void baseRemove(Widget eventSource,
EventListener listener, Type... types) {
HandlerManager manager = eventSource.getHandlerManager();
if (manager != null) {
baseRemove(manager, listener, types);
}
}
private Widget source;
protected ListenerWrapper(T listener) {
super(listener);
}
/**
* Sets the widget source to pass to the listeners. Source defaults to
* event.getSource() if this method is not used.
*
* @param source the source to provide as the listener's source
*/
public void setSource(Widget source) {
this.source = source;
}
/**
* Gets the widget source to pass to the listeners. Source defaults to
* event.getSource() if not specified by {@link #setSource(Widget)}.
*
* @param event the event
* @return source the source to provide as the listener's source
*/
protected Widget getSource(GwtEvent event) {
if (source == null) {
return (Widget) event.getSource();
} else {
return source;
}
}
}
