ui/gfx/render_text_linux.h

   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_LINUX_H_
   6 #define UI_GFX_RENDER_TEXT_LINUX_H_
   7
   8 #include <pango/pango.h>
   9 #include <vector>
  10
  11 #include "ui/gfx/render_text.h"
  12
  13 namespace gfx {
  14
  15 // RenderTextLinux is the Linux implementation of RenderText using Pango.
  16 class RenderTextLinux : public RenderText {
  17  public:
  18   RenderTextLinux();
  19   virtual ~RenderTextLinux();
  20
  21   // Overridden from RenderText:
  22   virtual Size GetStringSize() OVERRIDE;
  23   virtual int GetBaseline() OVERRIDE;
  24   virtual SelectionModel FindCursorPosition(const Point& point) OVERRIDE;
  25   virtual std::vector<FontSpan> GetFontSpansForTesting() OVERRIDE;
  26
  27  protected:
  28   // Overridden from RenderText:
  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 void GetGlyphBounds(size_t index,
  36                               ui::Range* xspan,
  37                               int* height) OVERRIDE;
  38   virtual std::vector<Rect> GetSubstringBounds(const ui::Range& range) OVERRIDE;
  39   virtual size_t TextIndexToLayoutIndex(size_t index) const OVERRIDE;
  40   virtual size_t LayoutIndexToTextIndex(size_t index) const OVERRIDE;
  41   virtual bool IsCursorablePosition(size_t position) OVERRIDE;
  42   virtual void ResetLayout() OVERRIDE;
  43   virtual void EnsureLayout() OVERRIDE;
  44   virtual void DrawVisualText(Canvas* canvas) OVERRIDE;
  45
  46  private:
  47   friend class RenderTextTest;
  48   FRIEND_TEST_ALL_PREFIXES(RenderTextTest, PangoAttributes);
  49
  50   // Returns the run that contains the character attached to the caret in the
  51   // given selection model. Return NULL if not found.
  52   GSList* GetRunContainingCaret(const SelectionModel& caret) const;
  53
  54   // Given a |run|, returns the SelectionModel that contains the logical first
  55   // or last caret position inside (not at a boundary of) the run.
  56   // The returned value represents a cursor/caret position without a selection.
  57   SelectionModel FirstSelectionModelInsideRun(const PangoItem* run);
  58   SelectionModel LastSelectionModelInsideRun(const PangoItem* run);
  59
  60   // Setup pango attribute: foreground, background, font, strike.
  61   void SetupPangoAttributes(PangoLayout* layout);
  62
  63   // Append one pango attribute |pango_attr| into pango attribute list |attrs|.
  64   void AppendPangoAttribute(size_t start,
  65                             size_t end,
  66                             PangoAttribute* pango_attr,
  67                             PangoAttrList* attrs);
  68
  69   // Get the text index corresponding to the |run|'s |glyph_index|.
  70   size_t GetGlyphTextIndex(PangoLayoutRun* run, int glyph_index) const;
  71
  72   // Pango Layout.
  73   PangoLayout* layout_;
  74   // A single line layout resulting from laying out via |layout_|.
  75   PangoLayoutLine* current_line_;
  76
  77   // Information about character attributes.
  78   PangoLogAttr* log_attrs_;
  79   // Number of attributes in |log_attrs_|.
  80   int num_log_attrs_;
  81
  82   // The text in the |layout_|.
  83   const char* layout_text_;
  84   // The text length.
  85   size_t layout_text_len_;
  86
  87   DISALLOW_COPY_AND_ASSIGN(RenderTextLinux);
  88 };
  89
  90 }  // namespace gfx
  91
  92 #endif  // UI_GFX_RENDER_TEXT_LINUX_H_