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