1 /************************************************************** 2 * 3 * Licensed to the Apache Software Foundation (ASF) under one 4 * or more contributor license agreements. See the NOTICE file 5 * distributed with this work for additional information 6 * regarding copyright ownership. The ASF licenses this file 7 * to you under the Apache License, Version 2.0 (the 8 * "License"); you may not use this file except in compliance 9 * with the License. You may obtain a copy of the License at 10 * 11 * http://www.apache.org/licenses/LICENSE-2.0 12 * 13 * Unless required by applicable law or agreed to in writing, 14 * software distributed under the License is distributed on an 15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 16 * KIND, either express or implied. See the License for the 17 * specific language governing permissions and limitations 18 * under the License. 19 * 20 *************************************************************/ 21 22 23 24 #ifndef INCLUDED_SLIDESHOW_EVENTHANDLER_HXX 25 #define INCLUDED_SLIDESHOW_EVENTHANDLER_HXX 26 27 #include <boost/shared_ptr.hpp> 28 29 30 /* Definition of EventHandler interface */ 31 32 namespace slideshow 33 { 34 namespace internal 35 { 36 37 /** Interface for event handling objects. 38 39 Classes implementing this interface can be added to an 40 EventMultiplexer object, and are called from there to 41 handle events. 42 */ 43 class EventHandler 44 { 45 public: ~EventHandler()46 virtual ~EventHandler() {} 47 48 /** Handle the event. 49 50 @return true, if this handler has successfully 51 processed the event. When this method returns false, 52 possibly other, less prioritized handlers are called, 53 too. 54 */ 55 virtual bool handleEvent() = 0; 56 }; 57 58 typedef ::boost::shared_ptr< EventHandler > EventHandlerSharedPtr; 59 60 } 61 } 62 63 #endif /* INCLUDED_SLIDESHOW_EVENTHANDLER_HXX */ 64