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   ~RenderTextMac() override;
  27
  28   // RenderText:
  29   scoped_ptr<RenderText> CreateInstanceOfSameType() const override;
  30   const base::string16& GetDisplayText() override;
  31   Size GetStringSize() override;
  32   SizeF GetStringSizeF() override;
  33   SelectionModel FindCursorPosition(const Point& point) override;
  34   std::vector<FontSpan> GetFontSpansForTesting() override;
  35
  36  protected:
  37   // RenderText:
  38   int GetDisplayTextBaseline() override;
  39   SelectionModel AdjacentCharSelectionModel(
  40       const SelectionModel& selection,
  41       VisualCursorDirection direction) override;
  42   SelectionModel AdjacentWordSelectionModel(
  43       const SelectionModel& selection,
  44       VisualCursorDirection direction) override;
  45   Range GetGlyphBounds(size_t index) override;
  46   std::vector<Rect> GetSubstringBounds(const Range& range) override;
  47   size_t TextIndexToDisplayIndex(size_t index) override;
  48   size_t DisplayIndexToTextIndex(size_t index) override;
  49   bool IsValidCursorIndex(size_t index) override;
  50   void OnLayoutTextAttributeChanged(bool text_changed) override;
  51   void OnDisplayTextAttributeChanged() override;
  52   void EnsureLayout() override;
  53   void DrawVisualText(Canvas* canvas) override;
  54
  55  private:
  56   struct TextRun {
  57     CTRunRef ct_run;
  58     SkPoint origin;
  59     std::vector<uint16> glyphs;
  60     std::vector<SkPoint> glyph_positions;
  61     SkScalar width;
  62     std::string font_name;
  63     int font_style;
  64     SkScalar text_size;
  65     SkColor foreground;
  66     bool underline;
  67     bool strike;
  68     bool diagonal_strike;
  69
  70     TextRun();
  71     ~TextRun();
  72   };
  73
  74   // Applies RenderText styles to |attr_string| with the given |ct_font|.
  75   void ApplyStyles(CFMutableAttributedStringRef attr_string, CTFontRef ct_font);
  76
  77   // Updates |runs_| based on |line_| and sets |runs_valid_| to true.
  78   void ComputeRuns();
  79
  80   // The Core Text line of text. Created by |EnsureLayout()|.
  81   base::ScopedCFTypeRef<CTLineRef> line_;
  82
  83   // Array to hold CFAttributedString attributes that allows Core Text to hold
  84   // weak references to them without leaking.
  85   base::ScopedCFTypeRef<CFMutableArrayRef> attributes_;
  86
  87   // Visual dimensions of the text. Computed by |EnsureLayout()|.
  88   SizeF string_size_;
  89
  90   // Common baseline for this line of text. Computed by |EnsureLayout()|.
  91   SkScalar common_baseline_;
  92
  93   // Visual text runs. Only valid if |runs_valid_| is true. Computed by
  94   // |ComputeRuns()|.
  95   std::vector<TextRun> runs_;
  96
  97   // Indicates that |runs_| are valid, set by |ComputeRuns()|.
  98   bool runs_valid_;
  99
 100   DISALLOW_COPY_AND_ASSIGN(RenderTextMac);
 101 };
 102
 103 }  // namespace gfx
 104
 105 #endif  // UI_GFX_RENDER_TEXT_MAC_H_