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 _SVX_ACCESSIBILITY_IACCESSIBLE_VIEW_FORWARDER_LISTENER_HXX 25 #define _SVX_ACCESSIBILITY_IACCESSIBLE_VIEW_FORWARDER_LISTENER_HXX 26 27 #include <sal/types.h> 28 #include <tools/gen.hxx> 29 30 31 namespace accessibility { 32 33 class IAccessibleViewForwarder; 34 35 /** <p>The purpose of this interface is to notify a user of an 36 IAccessibleViewForwarder when that view forwarder changes its 37 properties. Such a change may be one of the following: 38 <ul> 39 <li>Change of the coordinate transformation.</li> 40 <li>Change of the visible area (which in turn results in a change of the 41 coordinate transformation.</li> 42 <li>Change of the validity state of the view forwarder.</li> 43 */ 44 class IAccessibleViewForwarderListener 45 { 46 public: 47 /** Enumeration of the different change types. 48 */ 49 enum ChangeType {TRANSFORMATION, VISIBLE_AREA, STATE}; 50 51 /** This method is called to indicate a change of the specified view 52 forwarder. 53 @param aChangeType 54 The type of the change. TRANSFORMATION indicates a change of 55 the coordinate transformation with a constant visible area. If 56 the visible area changes, just use VISIBLE_AREA. This changes 57 the transformation implicitly. The value STATE indicates a 58 change of the validity state. Check the IsValid method of the 59 view forwarder before doing further calls. 60 @param pViewForwarder 61 The modified view forwarder. It is specified just in case that 62 there is more than one view forwarder in use at the same time. 63 */ 64 virtual void ViewForwarderChanged (ChangeType aChangeType, 65 const IAccessibleViewForwarder* pViewForwarder) = 0; 66 }; 67 68 } // end of namespace accessibility 69 70 #endif 71