1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef UI_GFX_RENDER_TEXT_PANGO_H_ 6 #define UI_GFX_RENDER_TEXT_PANGO_H_ 7 8 #include <pango/pango.h> 9 #include <vector> 10 11 #include "ui/gfx/render_text.h" 12 13 namespace gfx { 14 15 // RenderTextPango is the Linux implementation of RenderText using Pango. 16 class RenderTextPango : public RenderText { 17 public: 18 RenderTextPango(); 19 virtual ~RenderTextPango(); 20 21 // Overridden from RenderText: 22 virtual Size GetStringSize() OVERRIDE; 23 virtual SelectionModel FindCursorPosition(const Point& point) OVERRIDE; 24 virtual std::vector<FontSpan> GetFontSpansForTesting() OVERRIDE; 25 26 protected: 27 // Overridden from RenderText: 28 virtual int GetLayoutTextBaseline() OVERRIDE; 29 virtual SelectionModel AdjacentCharSelectionModel( 30 const SelectionModel& selection, 31 VisualCursorDirection direction) OVERRIDE; 32 virtual SelectionModel AdjacentWordSelectionModel( 33 const SelectionModel& selection, 34 VisualCursorDirection direction) OVERRIDE; 35 virtual Range GetGlyphBounds(size_t index) OVERRIDE; 36 virtual std::vector<Rect> GetSubstringBounds(const Range& range) OVERRIDE; 37 virtual size_t TextIndexToLayoutIndex(size_t index) const OVERRIDE; 38 virtual size_t LayoutIndexToTextIndex(size_t index) const OVERRIDE; 39 virtual bool IsCursorablePosition(size_t position) OVERRIDE; 40 virtual void ResetLayout() OVERRIDE; 41 virtual void EnsureLayout() OVERRIDE; 42 virtual void DrawVisualText(Canvas* canvas) OVERRIDE; 43 44 private: 45 friend class RenderTextTest; 46 FRIEND_TEST_ALL_PREFIXES(RenderTextTest, PangoAttributes); 47 48 // Returns the run that contains the character attached to the caret in the 49 // given selection model. Return NULL if not found. 50 GSList* GetRunContainingCaret(const SelectionModel& caret) const; 51 52 // Given a |run|, returns the SelectionModel that contains the logical first 53 // or last caret position inside (not at a boundary of) the run. 54 // The returned value represents a cursor/caret position without a selection. 55 SelectionModel FirstSelectionModelInsideRun(const PangoItem* run); 56 SelectionModel LastSelectionModelInsideRun(const PangoItem* run); 57 58 // Setup pango attribute: foreground, background, font, strike. 59 void SetupPangoAttributes(PangoLayout* layout); 60 61 // Append one pango attribute |pango_attr| into pango attribute list |attrs|. 62 void AppendPangoAttribute(size_t start, 63 size_t end, 64 PangoAttribute* pango_attr, 65 PangoAttrList* attrs); 66 67 // Get the text index corresponding to the |run|'s |glyph_index|. 68 size_t GetGlyphTextIndex(PangoLayoutRun* run, int glyph_index) const; 69 70 // Pango Layout. 71 PangoLayout* layout_; 72 // A single line layout resulting from laying out via |layout_|. 73 PangoLayoutLine* current_line_; 74 75 // Information about character attributes. 76 PangoLogAttr* log_attrs_; 77 // Number of attributes in |log_attrs_|. 78 int num_log_attrs_; 79 80 // The text in the |layout_|. 81 const char* layout_text_; 82 83 DISALLOW_COPY_AND_ASSIGN(RenderTextPango); 84 }; 85 86 } // namespace gfx 87 88 #endif // UI_GFX_RENDER_TEXT_PANGO_H_ 89