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1 : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
2 : /*
3 : * This file is part of the LibreOffice project.
4 : *
5 : * This Source Code Form is subject to the terms of the Mozilla Public
6 : * License, v. 2.0. If a copy of the MPL was not distributed with this
7 : * file, You can obtain one at http://mozilla.org/MPL/2.0/.
8 : *
9 : * This file incorporates work covered by the following license notice:
10 : *
11 : * Licensed to the Apache Software Foundation (ASF) under one or more
12 : * contributor license agreements. See the NOTICE file distributed
13 : * with this work for additional information regarding copyright
14 : * ownership. The ASF licenses this file to you under the Apache
15 : * License, Version 2.0 (the "License"); you may not use this file
16 : * except in compliance with the License. You may obtain a copy of
17 : * the License at http://www.apache.org/licenses/LICENSE-2.0 .
18 : */
19 :
20 : #ifndef INCLUDED_SVX_IACCESSIBLEVIEWFORWARDERLISTENER_HXX
21 : #define INCLUDED_SVX_IACCESSIBLEVIEWFORWARDERLISTENER_HXX
22 :
23 : #include <sal/types.h>
24 :
25 :
26 : namespace accessibility {
27 :
28 : class IAccessibleViewForwarder;
29 :
30 : /** <p>The purpose of this interface is to notify a user of an
31 : IAccessibleViewForwarder when that view forwarder changes its
32 : properties. Such a change may be one of the following:
33 : <ul>
34 : <li>Change of the coordinate transformation.</li>
35 : <li>Change of the visible area (which in turn results in a change of the
36 : coordinate transformation.</li>
37 : <li>Change of the validity state of the view forwarder.</li>
38 : */
39 20 : class IAccessibleViewForwarderListener
40 : {
41 : public:
42 : /** Enumeration of the different change types.
43 : */
44 : enum ChangeType {TRANSFORMATION, VISIBLE_AREA, STATE};
45 :
46 : /** This method is called to indicate a change of the specified view
47 : forwarder.
48 : @param aChangeType
49 : The type of the change. TRANSFORMATION indicates a change of
50 : the coordinate transformation with a constant visible area. If
51 : the visible area changes, just use VISIBLE_AREA. This changes
52 : the transformation implicitly. The value STATE indicates a
53 : change of the validity state. Check the IsValid method of the
54 : view forwarder before doing further calls.
55 : @param pViewForwarder
56 : The modified view forwarder. It is specified just in case that
57 : there is more than one view forwarder in use at the same time.
58 : */
59 : virtual void ViewForwarderChanged (ChangeType aChangeType,
60 : const IAccessibleViewForwarder* pViewForwarder) = 0;
61 :
62 : protected:
63 20 : ~IAccessibleViewForwarderListener() {}
64 : };
65 :
66 : } // end of namespace accessibility
67 :
68 : #endif
69 :
70 : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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