1 #ifndef DALI_PLATFORM_TEXT_ABSTRACTION_BIDIRECTIONAL_SUPPORT_H
2 #define DALI_PLATFORM_TEXT_ABSTRACTION_BIDIRECTIONAL_SUPPORT_H
5 * Copyright (c) 2021 Samsung Electronics Co., Ltd.
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
22 #include <dali/devel-api/text-abstraction/text-abstraction-definitions.h>
25 #include <dali/public-api/actors/actor-enumerations.h>
26 #include <dali/public-api/object/base-handle.h>
29 #include <dali/public-api/dali-adaptor-common.h>
33 namespace TextAbstraction
35 namespace Internal DALI_INTERNAL
37 class BidirectionalSupport;
39 } // namespace DALI_INTERNAL
42 * BidirectionalSupport API
45 class DALI_ADAPTOR_API BidirectionalSupport : public BaseHandle
49 * @brief Create an uninitialized TextAbstraction handle.
52 BidirectionalSupport();
57 * This is non-virtual since derived Handle types must not contain data or virtual methods.
59 ~BidirectionalSupport();
62 * @brief This constructor is used by BidirectionalSupport::Get().
64 * @param[in] implementation a pointer to the internal bidirectional support object.
66 explicit DALI_INTERNAL BidirectionalSupport(Internal::BidirectionalSupport* implementation);
69 * @brief Retrieve a handle to the BidirectionalSupport instance.
71 * @return A handle to the BidirectionalSupport
73 static BidirectionalSupport Get();
76 * @brief Creates bidirectional data for the whole paragraph.
78 * @param[in] paragraph Pointer to the first character of the paragraph coded in UTF32.
79 * @param[in] numberOfCharacters The number of characters of the paragraph.
80 * @param[in] matchLayoutDirection Whether match for layout direction or not.
81 * @param[in] layoutDirection The direction of the layout direction.
82 * @return An index of an object inside a table storing the bidirectional data.
84 BidiInfoIndex CreateInfo(const Character* const paragraph,
85 Length numberOfCharacters,
86 bool matchLayoutDirection,
87 LayoutDirection::Type layoutDirection);
90 * @brief Destroys the bidirectional data.
92 * @param[in] bidiInfoIndex The index to the of the object inside the table storing the bidirectional data for the current paragraph.
94 void DestroyInfo(BidiInfoIndex bidiInfoIndex);
97 * @brief Reorders a line of a paragraph.
99 * @pre visualToLogicalMap must have enough space allocated for @p numberOfCharacters.
101 * @param[in] bidiInfoIndex The index to the of the object inside the table storing the bidirectional data for the current paragraph.
102 * @param[in] firstCharacterIndex The first character of the line within the whole paragraph.
103 * @param[in] numberOfCharacters The number of characters of the line.
104 * @param[out] visualToLogicalMap The visual to logical conversion map.
106 void Reorder(BidiInfoIndex bidiInfoIndex,
107 CharacterIndex firstCharacterIndex,
108 Length numberOfCharacters,
109 CharacterIndex* visualToLogicalMap);
112 * @brief Replaces any character which could be mirrored.
114 * @param[in,out] text The text.
115 * @param[in] directions The direction of each paragraph.
116 * @param[in] numberOfCharacters The number of characters.
118 * @return @e true if a character has been replaced.
120 bool GetMirroredText(Character* text,
121 CharacterDirection* directions,
122 Length numberOfCharacters);
125 * @brief Retrieves the paragrpah's direction.
127 * @param[in] bidiInfoIndex The index to the of the object inside the table storing the bidirectional data for the current paragraph.
129 * @return @e true if the paragraph is right to left, otherwise @e false.
131 bool GetParagraphDirection(BidiInfoIndex bidiInfoIndex) const;
134 * @brief Retrieves the character's directions.
136 * @param[in] bidiInfoIndex The index to the of the object inside the table storing the bidirectional data for the current paragraph.
137 * @param[out] directions The direction, @e false is left to right and @e true is right to left, of each character of the paragraph.
138 * @param[in] numberOfCharacters The number of characters.
140 void GetCharactersDirection(BidiInfoIndex bidiInfoIndex,
141 CharacterDirection* directions,
142 Length numberOfCharacters);
145 } // namespace TextAbstraction
149 #endif // DALI_PLATFORM_TEXT_ABSTRACTION_BIDIRECTIONAL_SUPPORT_H