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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef UI_GFX_RENDER_TEXT_H_ | 5 #ifndef UI_GFX_RENDER_TEXT_H_ |
6 #define UI_GFX_RENDER_TEXT_H_ | 6 #define UI_GFX_RENDER_TEXT_H_ |
7 #pragma once | 7 #pragma once |
8 | 8 |
9 #include <algorithm> | 9 #include <algorithm> |
10 #include <vector> | 10 #include <vector> |
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227 // render the text and its attributes. | 227 // render the text and its attributes. |
228 virtual void UpdateLayout() = 0; | 228 virtual void UpdateLayout() = 0; |
229 | 229 |
230 // Ensure the text is laid out. | 230 // Ensure the text is laid out. |
231 virtual void EnsureLayout() = 0; | 231 virtual void EnsureLayout() = 0; |
232 | 232 |
233 // Draw the text. | 233 // Draw the text. |
234 virtual void DrawVisualText(Canvas* canvas) = 0; | 234 virtual void DrawVisualText(Canvas* canvas) = 0; |
235 | 235 |
236 // Get the logical index of the grapheme preceding the argument |position|. | 236 // Get the logical index of the grapheme preceding the argument |position|. |
237 // If |IsCursorablePosition(position)| is true, the result will be the start | |
238 // of the previous grapheme, if any. Otherwise, the result will be the start | |
239 // of the grapheme containing |position|. | |
240 size_t GetIndexOfPreviousGrapheme(size_t position); | 237 size_t GetIndexOfPreviousGrapheme(size_t position); |
241 | 238 |
242 // Apply composition style (underline) to composition range and selection | 239 // Apply composition style (underline) to composition range and selection |
243 // style (foreground) to selection range. | 240 // style (foreground) to selection range. |
244 void ApplyCompositionAndSelectionStyles(StyleRanges* style_ranges) const; | 241 void ApplyCompositionAndSelectionStyles(StyleRanges* style_ranges) const; |
245 | 242 |
246 // Convert points from the text space to the view space and back. | 243 // Convert points from the text space to the view space and back. |
247 // Handles the display area, display offset, and the application LTR/RTL mode. | 244 // Handles the display area, display offset, and the application LTR/RTL mode. |
248 Point ToTextPoint(const Point& point); | 245 Point ToTextPoint(const Point& point); |
249 Point ToViewPoint(const Point& point); | 246 Point ToViewPoint(const Point& point); |
250 | 247 |
251 private: | 248 private: |
252 friend class RenderTextTest; | 249 friend class RenderTextTest; |
253 | 250 |
254 FRIEND_TEST_ALL_PREFIXES(RenderTextTest, DefaultStyle); | 251 FRIEND_TEST_ALL_PREFIXES(RenderTextTest, DefaultStyle); |
255 FRIEND_TEST_ALL_PREFIXES(RenderTextTest, CustomDefaultStyle); | 252 FRIEND_TEST_ALL_PREFIXES(RenderTextTest, CustomDefaultStyle); |
256 FRIEND_TEST_ALL_PREFIXES(RenderTextTest, ApplyStyleRange); | 253 FRIEND_TEST_ALL_PREFIXES(RenderTextTest, ApplyStyleRange); |
257 FRIEND_TEST_ALL_PREFIXES(RenderTextTest, StyleRangesAdjust); | 254 FRIEND_TEST_ALL_PREFIXES(RenderTextTest, StyleRangesAdjust); |
258 FRIEND_TEST_ALL_PREFIXES(RenderTextTest, GraphemePositions); | |
259 FRIEND_TEST_ALL_PREFIXES(RenderTextTest, SelectionModels); | |
260 | 255 |
261 // Return an index belonging to the |next| or previous logical grapheme. | 256 // Return an index belonging to the |next| or previous logical grapheme. |
262 // If |next| is false and |IsCursorablePosition(index)| is true, the result | |
263 // will be the start of the previous grapheme, if any. Otherwise, the result | |
264 // will be the start of the grapheme containing |index|. | |
265 // The return value is bounded by 0 and the text length, inclusive. | 257 // The return value is bounded by 0 and the text length, inclusive. |
266 virtual size_t IndexOfAdjacentGrapheme(size_t index, bool next) = 0; | 258 virtual size_t IndexOfAdjacentGrapheme(size_t index, bool next) = 0; |
267 | 259 |
268 // Set the cursor to |position|, with the caret trailing the previous | 260 // Set the cursor to |position|, with the caret trailing the previous |
269 // grapheme, or if there is no previous grapheme, leading the cursor position. | 261 // grapheme, or if there is no previous grapheme, leading the cursor position. |
270 // If |select| is false, the selection start is moved to the same position. | 262 // If |select| is false, the selection start is moved to the same position. |
271 // If the |position| is not a cursorable position (not on grapheme boundary), | 263 // If the |position| is not a cursorable position (not on grapheme boundary), |
272 // it is a NO-OP. | 264 // it is a NO-OP. |
273 void MoveCursorTo(size_t position, bool select); | 265 void MoveCursorTo(size_t position, bool select); |
274 | 266 |
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313 // The cached bounds and offset are invalidated by changes to the cursor, | 305 // The cached bounds and offset are invalidated by changes to the cursor, |
314 // selection, font, and other operations that adjust the visible text bounds. | 306 // selection, font, and other operations that adjust the visible text bounds. |
315 bool cached_bounds_and_offset_valid_; | 307 bool cached_bounds_and_offset_valid_; |
316 | 308 |
317 DISALLOW_COPY_AND_ASSIGN(RenderText); | 309 DISALLOW_COPY_AND_ASSIGN(RenderText); |
318 }; | 310 }; |
319 | 311 |
320 } // namespace gfx | 312 } // namespace gfx |
321 | 313 |
322 #endif // UI_GFX_RENDER_TEXT_H_ | 314 #endif // UI_GFX_RENDER_TEXT_H_ |
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