litesoft
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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.gen2.event.shared; import com.google.gwt.core.client.*; import com.google.gwt.gen2.event.shared.AbstractEvent.*; /** * Manager responsible for adding handlers to event sources and firing those * handlers on passed in events. * * @deprecated use the com.google.gwt.event.shared classes instead */ @Deprecated public class HandlerManager { // Used to optimize the JavaScript handler container structure. static int EXPECTED_HANDLERS = 5; private static final boolean useJs = GWT.isScript(); private static int index = -EXPECTED_HANDLERS; static int createKeyIndex() { // Need to leave space for the size and the unflattened list if we end up // needing it. index += EXPECTED_HANDLERS + 2; return index; } // Only one of JsHandlerRegistry and JavaHandlerRegistry are live at once. private final JsHandlerRegistry javaScriptRegistry; private final JavaHandlerRegistry javaRegistry; // private final Object source; /** * Creates a handler manager with the given source. * * @param source the event source */ public HandlerManager( Object source ) { if ( useJs ) { javaScriptRegistry = JsHandlerRegistry.create(); javaRegistry = null; } else { javaRegistry = new JavaHandlerRegistry(); javaScriptRegistry = null; } this.source = source; } /** * Adds a handle. * * @param <HandlerType> The type of handler. * @param type the event type associated with this handler * @param handler the handler * * @return the handler registration, can be stored in order to remove the * handler later */ public <HandlerType extends EventHandler> HandlerRegistration addHandler( AbstractEvent.Type<?, HandlerType> type, final HandlerType handler ) { if ( useJs ) { javaScriptRegistry.addHandler( type, handler ); } else { javaRegistry.addHandler( type, handler ); } return new HandlerRegistration( this, type, handler ); } /** * Clears all the handlers associated with the given type. * * @param type the type */ public void clearHandlers( Type<?, ?> type ) { if ( useJs ) { javaScriptRegistry.clearHandlers( type ); } else { javaRegistry.clearHandlers( type ); } } /** * Fires the given event to the handlers listening to the event's type. * * @param event the event */ public void fireEvent( AbstractEvent event ) { Object oldSource = event.getSource(); event.setSource( source ); if ( useJs ) { javaScriptRegistry.fireEvent( event ); } else { javaRegistry.fireEvent( event ); } if ( oldSource == null ) { // This was my event, so I should kill it now that I'm done. event.kill(); } else { // Restoring the source for the next handler to use. event.setSource( oldSource ); } } /** * Gets the handler at the given index. * * @param <HandlerType> the event handler type * @param index the index * @param type the handler's event type * * @return the given handler */ public <HandlerType extends EventHandler> HandlerType getHandler( AbstractEvent.Type<?, HandlerType> type, int index ) { if ( useJs ) { return (HandlerType) javaScriptRegistry.getHandler( type, index ); } else { return (HandlerType) javaRegistry.getHandler( type, index ); } } /** * Gets the number of handlers listening to the event type. * * @param type the event type * * @return the number of registered handlers */ public int getHandlerCount( Type type ) { if ( useJs ) { return javaScriptRegistry.getHandlerCount( type ); } else { return javaRegistry.getHandlerCount( type ); } } /** * Gets the source for events fired from this manager. * * @return the source */ public Object getSource() { return source; } /** * Are there handlers in this manager listening to the given event type? * * @param type the event type * * @return are handlers listening on the given event type */ public boolean isEventHandled( Type type ) { return getHandlerCount( type ) > 0; } /** * Removes the given handler from the specified event type. Normally, * applications should call {@link HandlerRegistration#removeHandler()} * instead. This method is provided primary to support deprecated APIS. * * @param <HandlerType> handler type * @param type the event type * @param handler the handler */ public <HandlerType extends EventHandler> void removeHandler( AbstractEvent.Type<?, HandlerType> type, final HandlerType handler ) { if ( useJs ) { javaScriptRegistry.removeHandler( type, handler ); } else { javaRegistry.removeHandler( type, handler ); } } } |