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.
5 #ifndef UI_GFX_RENDER_TEXT_PANGO_H_
6 #define UI_GFX_RENDER_TEXT_PANGO_H_
8 #include <pango/pango.h>
11 #include "ui/gfx/render_text.h"
15 // RenderTextPango is the Linux implementation of RenderText using Pango.
16 class RenderTextPango : public RenderText {
19 virtual ~RenderTextPango();
21 // Overridden from RenderText:
22 virtual Size GetStringSize() OVERRIDE;
23 virtual SelectionModel FindCursorPosition(const Point& point) OVERRIDE;
24 virtual std::vector<FontSpan> GetFontSpansForTesting() OVERRIDE;
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 IsValidCursorIndex(size_t index) OVERRIDE;
40 virtual void ResetLayout() OVERRIDE;
41 virtual void EnsureLayout() OVERRIDE;
42 virtual void DrawVisualText(Canvas* canvas) OVERRIDE;
45 friend class RenderTextTest;
46 FRIEND_TEST_ALL_PREFIXES(RenderTextTest, PangoAttributes);
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;
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);
58 // Setup pango attribute: foreground, background, font, strike.
59 void SetupPangoAttributes(PangoLayout* layout);
61 // Append one pango attribute |pango_attr| into pango attribute list |attrs|.
62 void AppendPangoAttribute(size_t start,
64 PangoAttribute* pango_attr,
65 PangoAttrList* attrs);
67 // Get the text index corresponding to the |run|'s |glyph_index|.
68 size_t GetGlyphTextIndex(PangoLayoutRun* run, int glyph_index) const;
72 // A single line layout resulting from laying out via |layout_|.
73 PangoLayoutLine* current_line_;
75 // Information about character attributes.
76 PangoLogAttr* log_attrs_;
77 // Number of attributes in |log_attrs_|.
80 // The text in the |layout_|.
81 const char* layout_text_;
83 DISALLOW_COPY_AND_ASSIGN(RenderTextPango);
88 #endif // UI_GFX_RENDER_TEXT_PANGO_H_