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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 _CPPCANVAS_ACTION_HXX
21 : #define _CPPCANVAS_ACTION_HXX
22 :
23 : #include <sal/types.h>
24 :
25 : #include <boost/shared_ptr.hpp>
26 :
27 : namespace basegfx
28 : {
29 : class B2DHomMatrix;
30 : class B2DRange;
31 : }
32 :
33 :
34 : /* Definition of Action interface */
35 :
36 : namespace cppcanvas
37 : {
38 : namespace internal
39 : {
40 : /** Interface for internal render actions
41 :
42 : This interface is implemented by all objects generated
43 : from the metafile renderer, and corresponds roughly to the
44 : VCL meta action.
45 : */
46 0 : class Action
47 : {
48 : public:
49 : /** Used for rendering action subsets
50 :
51 : There are several cases where an Action might have
52 : subsettable content, e.g. text, or referenced
53 : metafiles, like the transparent action.
54 :
55 : Generally, at the metafile renderer, all actions are
56 : 'flattened' out, i.e. a meta action rendering the
57 : string "Hello" counts five indices, and a transparent
58 : action containing a metafile with 100 actions counts
59 : at least 100 indices (contained transparency or text
60 : actions recursively add to this value). From the
61 : outside, the subset to render is referenced via this
62 : flat index range
63 : */
64 : struct Subset
65 : {
66 : /** Denotes start of the subset.
67 :
68 : The index given here specifies the first subaction
69 : to render.
70 : */
71 : sal_Int32 mnSubsetBegin;
72 :
73 : /** Denotes end of the subset
74 :
75 : The index given here specifies the first subaction
76 : <em>not<em> to render, i.e. one action behind the
77 : subset to be rendered
78 : */
79 : sal_Int32 mnSubsetEnd;
80 : };
81 :
82 0 : virtual ~Action() {}
83 :
84 : /** Render this action to the associated canvas
85 :
86 : @param rTransformation
87 : Transformation matrix to apply before rendering
88 :
89 : @return true, if rendering was successful. If
90 : rendering failed, false is returned.
91 : */
92 : virtual bool render( const ::basegfx::B2DHomMatrix& rTransformation ) const = 0;
93 :
94 : /** Render the given part of the action to the associated
95 : canvas.
96 :
97 : @param rTransformation
98 : Transformation matrix to apply before rendering
99 :
100 : @param rSubset
101 : Subset of the action to render. See Subset description
102 : for index semantics.
103 :
104 : @return true, if rendering was successful. If the
105 : specified subset is invalid for this action, or if
106 : rendering failed for other reasons, false is returned.
107 : */
108 : virtual bool renderSubset( const ::basegfx::B2DHomMatrix& rTransformation,
109 : const Subset& rSubset ) const = 0;
110 :
111 : /** Query bounds of this action on the associated canvas
112 :
113 : @param rTransformation
114 : Transformation matrix to apply
115 :
116 : @return the bounds for this action in device
117 : coordinate space.
118 : */
119 : virtual ::basegfx::B2DRange getBounds( const ::basegfx::B2DHomMatrix& rTransformation ) const = 0;
120 :
121 : /** Query bounds for the given part of the action on the
122 : associated canvas.
123 :
124 : @param rTransformation
125 : Transformation matrix to apply.
126 :
127 : @param rSubset
128 : Subset of the action to query. See Subset description
129 : for index semantics.
130 :
131 : @return the bounds for the given subset in device
132 : coordinate space.
133 : */
134 : virtual ::basegfx::B2DRange getBounds( const ::basegfx::B2DHomMatrix& rTransformation,
135 : const Subset& rSubset ) const = 0;
136 :
137 : /** Query action count.
138 :
139 : This method returns the number of subset actions
140 : contained in this action. The render( Subset ) method
141 : must accept subset ranges up to the value returned
142 : here.
143 :
144 : @return the number of subset actions
145 : */
146 : virtual sal_Int32 getActionCount() const = 0;
147 : };
148 :
149 : typedef ::boost::shared_ptr< Action > ActionSharedPtr;
150 :
151 : }
152 : }
153 :
154 : #endif /* _CPPCANVAS_ACTION_HXX */
155 :
156 : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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