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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 _SVX_ACCESSIBILITY_IACCESSIBLE_VIEW_FORWARDER_LISTENER_HXX
21 : #define _SVX_ACCESSIBILITY_IACCESSIBLE_VIEW_FORWARDER_LISTENER_HXX
22 :
23 : #include <sal/types.h>
24 : #include <tools/gen.hxx>
25 :
26 :
27 : namespace accessibility {
28 :
29 : class IAccessibleViewForwarder;
30 :
31 : /** <p>The purpose of this interface is to notify a user of an
32 : IAccessibleViewForwarder when that view forwarder changes its
33 : properties. Such a change may be one of the following:
34 : <ul>
35 : <li>Change of the coordinate transformation.</li>
36 : <li>Change of the visible area (which in turn results in a change of the
37 : coordinate transformation.</li>
38 : <li>Change of the validity state of the view forwarder.</li>
39 : */
40 0 : class IAccessibleViewForwarderListener
41 : {
42 : public:
43 : /** Enumeration of the different change types.
44 : */
45 : enum ChangeType {TRANSFORMATION, VISIBLE_AREA, STATE};
46 :
47 : /** This method is called to indicate a change of the specified view
48 : forwarder.
49 : @param aChangeType
50 : The type of the change. TRANSFORMATION indicates a change of
51 : the coordinate transformation with a constant visible area. If
52 : the visible area changes, just use VISIBLE_AREA. This changes
53 : the transformation implicitly. The value STATE indicates a
54 : change of the validity state. Check the IsValid method of the
55 : view forwarder before doing further calls.
56 : @param pViewForwarder
57 : The modified view forwarder. It is specified just in case that
58 : there is more than one view forwarder in use at the same time.
59 : */
60 : virtual void ViewForwarderChanged (ChangeType aChangeType,
61 : const IAccessibleViewForwarder* pViewForwarder) = 0;
62 :
63 : protected:
64 0 : ~IAccessibleViewForwarderListener() {}
65 : };
66 :
67 : } // end of namespace accessibility
68 :
69 : #endif
70 :
71 : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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