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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_HXX
21 : : #define _SVX_ACCESSIBILITY_IACCESSIBLE_VIEW_FORWARDER_HXX
22 : :
23 : : #include <sal/types.h>
24 : : #include <tools/gen.hxx>
25 : :
26 : :
27 : : namespace accessibility {
28 : :
29 : :
30 : :
31 : : /** <p>This interface provides the means to transform between internal
32 : : coordinates in 100th of mm and screen coordinates without giving direct
33 : : access to the underlying view. Each view forwarder represents a
34 : : specific real or virtual window. A call to
35 : : <method>GetVisibleArea</method> returns the visible rectangle that
36 : : corresponds to this window.</p>
37 : :
38 : : <p>This interface is similar to the <type>SvxViewForwarder</type> but
39 : : differs in two important points: Firstly the <member>GetVisArea</member>
40 : : method returns a rectangle in internal coordinates and secondly the
41 : : transformation methods do not require explicit mapmodes. These have to
42 : : be provided implicitely by the classes that implement this
43 : : interface. A third, less important, difference are the additional
44 : : transfomation methods for sizes. The reasons for their existince are
45 : : convenience and improved performance.</p>
46 : :
47 : : @attention
48 : : Note, that modifications of the underlying view that lead to
49 : : different transformations between internal and screen coordinates or
50 : : change the validity of the forwarder have to be signaled seperately.
51 : : */
52 : 243 : class IAccessibleViewForwarder
53 : : {
54 : : public:
55 [ - + ]: 243 : virtual ~IAccessibleViewForwarder (void){};
56 : :
57 : : /** This method informs you about the state of the forwarder. Do not
58 : : use it when the returned value is <false/>.
59 : :
60 : : @return
61 : : Return <true/> if the view forwarder is valid and <false/> else.
62 : : */
63 : : virtual sal_Bool IsValid (void) const = 0;
64 : :
65 : : /** Returns the area of the underlying document that is visible in the
66 : : * corresponding window.
67 : :
68 : : @return
69 : : The rectangle of the visible part of the document. The values
70 : : are, contrary to the base class, in internal coordinates of
71 : : 100th of mm.
72 : : */
73 : : virtual Rectangle GetVisibleArea() const = 0;
74 : :
75 : : /** Transform the specified point from internal coordinates in 100th of
76 : : mm to an absolute screen position.
77 : :
78 : : @param rPoint
79 : : Point in internal coordinates (100th of mm).
80 : :
81 : : @return
82 : : The same point but in screen coordinates relative to the upper
83 : : left corner of the (current) screen.
84 : : */
85 : : virtual Point LogicToPixel (const Point& rPoint) const = 0;
86 : :
87 : : /** Transform the specified size from internal coordinates in 100th of
88 : : mm to a screen oriented pixel size.
89 : :
90 : : @param rSize
91 : : Size in internal coordinates (100th of mm).
92 : :
93 : : @return
94 : : The same size but in screen coordinates.
95 : : */
96 : : virtual Size LogicToPixel (const Size& rSize) const = 0;
97 : :
98 : : /** Transform the specified point from absolute screen coordinates to
99 : : internal coordinates (100th of mm).
100 : :
101 : : @param rPoint
102 : : Point in screen coordinates relative to the upper left corner of
103 : : the (current) screen.
104 : :
105 : : @return
106 : : The same point but in internal coordinates (100th of mm).
107 : : */
108 : : virtual Point PixelToLogic (const Point& rPoint) const = 0;
109 : :
110 : : /** Transform the specified size from screen coordinates to internal
111 : : coordinates (100th of mm).
112 : :
113 : : @param rSize
114 : : Size in screen coordinates.
115 : :
116 : : @return
117 : : The same size but in internal coordinates (100th of mm).
118 : : */
119 : : virtual Size PixelToLogic (const Size& rSize) const = 0;
120 : : };
121 : :
122 : : } // end of namespace accessibility
123 : :
124 : : #endif
125 : :
126 : : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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