ui/gfx/render_text_mac.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_MAC_H_
   6 #define UI_GFX_RENDER_TEXT_MAC_H_
   7
   8 #include <ApplicationServices/ApplicationServices.h>
   9
  10 #include <string>
  11 #include <vector>
  12
  13 #include "base/mac/scoped_cftyperef.h"
  14 #include "ui/gfx/render_text.h"
  15
  16 namespace gfx {
  17
  18 // RenderTextMac is the Mac implementation of RenderText that uses CoreText for
  19 // layout and Skia for drawing.
  20 //
  21 // Note: The current implementation only supports drawing and sizing the text,
  22 //       but not text selection or cursor movement.
  23 class RenderTextMac : public RenderText {
  24  public:
  25   RenderTextMac();
  26   virtual ~RenderTextMac();
  27
  28   // Overridden from RenderText:
  29   virtual Size GetStringSize() OVERRIDE;
  30   virtual SizeF GetStringSizeF() OVERRIDE;
  31   virtual SelectionModel FindCursorPosition(const Point& point) OVERRIDE;
  32   virtual std::vector<FontSpan> GetFontSpansForTesting() OVERRIDE;
  33
  34  protected:
  35   // Overridden from RenderText:
  36   virtual int GetLayoutTextBaseline() OVERRIDE;
  37   virtual SelectionModel AdjacentCharSelectionModel(
  38       const SelectionModel& selection,
  39       VisualCursorDirection direction) OVERRIDE;
  40   virtual SelectionModel AdjacentWordSelectionModel(
  41       const SelectionModel& selection,
  42       VisualCursorDirection direction) OVERRIDE;
  43   virtual Range GetGlyphBounds(size_t index) OVERRIDE;
  44   virtual std::vector<Rect> GetSubstringBounds(const Range& range) OVERRIDE;
  45   virtual size_t TextIndexToLayoutIndex(size_t index) const OVERRIDE;
  46   virtual size_t LayoutIndexToTextIndex(size_t index) const OVERRIDE;
  47   virtual bool IsValidCursorIndex(size_t index) OVERRIDE;
  48   virtual void ResetLayout() OVERRIDE;
  49   virtual void EnsureLayout() OVERRIDE;
  50   virtual void DrawVisualText(Canvas* canvas) OVERRIDE;
  51
  52  private:
  53   struct TextRun {
  54     CTRunRef ct_run;
  55     SkPoint origin;
  56     std::vector<uint16> glyphs;
  57     std::vector<SkPoint> glyph_positions;
  58     SkScalar width;
  59     std::string font_name;
  60     int font_style;
  61     SkScalar text_size;
  62     SkColor foreground;
  63     bool underline;
  64     bool strike;
  65     bool diagonal_strike;
  66
  67     TextRun();
  68     ~TextRun();
  69   };
  70
  71   // Applies RenderText styles to |attr_string| with the given |ct_font|.
  72   void ApplyStyles(CFMutableAttributedStringRef attr_string, CTFontRef ct_font);
  73
  74   // Updates |runs_| based on |line_| and sets |runs_valid_| to true.
  75   void ComputeRuns();
  76
  77   // The Core Text line of text. Created by |EnsureLayout()|.
  78   base::ScopedCFTypeRef<CTLineRef> line_;
  79
  80   // Array to hold CFAttributedString attributes that allows Core Text to hold
  81   // weak references to them without leaking.
  82   base::ScopedCFTypeRef<CFMutableArrayRef> attributes_;
  83
  84   // Visual dimensions of the text. Computed by |EnsureLayout()|.
  85   SizeF string_size_;
  86
  87   // Common baseline for this line of text. Computed by |EnsureLayout()|.
  88   SkScalar common_baseline_;
  89
  90   // Visual text runs. Only valid if |runs_valid_| is true. Computed by
  91   // |ComputeRuns()|.
  92   std::vector<TextRun> runs_;
  93
  94   // Indicates that |runs_| are valid, set by |ComputeRuns()|.
  95   bool runs_valid_;
  96
  97   DISALLOW_COPY_AND_ASSIGN(RenderTextMac);
  98 };
  99
 100 }  // namespace gfx
 101
 102 #endif  // UI_GFX_RENDER_TEXT_MAC_H_