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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_GFX_RENDER_TEXT_MAC_H_
#define UI_GFX_RENDER_TEXT_MAC_H_
#include <ApplicationServices/ApplicationServices.h>
#include <string>
#include <vector>
#include "base/mac/scoped_cftyperef.h"
#include "ui/gfx/render_text.h"
namespace gfx {
// RenderTextMac is the Mac implementation of RenderText that uses CoreText for
// layout and Skia for drawing.
//
// Note: The current implementation only supports drawing and sizing the text,
// but not text selection or cursor movement.
class RenderTextMac : public RenderText {
public:
RenderTextMac();
virtual ~RenderTextMac();
// Overridden from RenderText:
virtual Size GetStringSize() OVERRIDE;
virtual int GetBaseline() OVERRIDE;
virtual SelectionModel FindCursorPosition(const Point& point) OVERRIDE;
virtual std::vector<FontSpan> GetFontSpansForTesting() OVERRIDE;
protected:
// Overridden from RenderText:
virtual SelectionModel AdjacentCharSelectionModel(
const SelectionModel& selection,
VisualCursorDirection direction) OVERRIDE;
virtual SelectionModel AdjacentWordSelectionModel(
const SelectionModel& selection,
VisualCursorDirection direction) OVERRIDE;
virtual ui::Range GetGlyphBounds(size_t index) OVERRIDE;
virtual std::vector<Rect> GetSubstringBounds(const ui::Range& range) OVERRIDE;
virtual size_t TextIndexToLayoutIndex(size_t index) const OVERRIDE;
virtual size_t LayoutIndexToTextIndex(size_t index) const OVERRIDE;
virtual bool IsCursorablePosition(size_t position) OVERRIDE;
virtual void ResetLayout() OVERRIDE;
virtual void EnsureLayout() OVERRIDE;
virtual void DrawVisualText(Canvas* canvas) OVERRIDE;
private:
struct TextRun {
CTRunRef ct_run;
SkPoint origin;
std::vector<uint16> glyphs;
std::vector<SkPoint> glyph_positions;
SkScalar width;
std::string font_name;
int font_style;
SkScalar text_size;
SkColor foreground;
bool underline;
bool strike;
bool diagonal_strike;
TextRun();
~TextRun();
};
// Applies RenderText styles to |attr_string| with the given |ct_font|.
void ApplyStyles(CFMutableAttributedStringRef attr_string, CTFontRef ct_font);
// Updates |runs_| based on |line_| and sets |runs_valid_| to true.
void ComputeRuns();
// The Core Text line of text. Created by |EnsureLayout()|.
base::mac::ScopedCFTypeRef<CTLineRef> line_;
// Array to hold CFAttributedString attributes that allows Core Text to hold
// weak references to them without leaking.
base::mac::ScopedCFTypeRef<CFMutableArrayRef> attributes_;
// Visual dimensions of the text. Computed by |EnsureLayout()|.
Size string_size_;
// Common baseline for this line of text. Computed by |EnsureLayout()|.
SkScalar common_baseline_;
// Visual text runs. Only valid if |runs_valid_| is true. Computed by
// |ComputeRuns()|.
std::vector<TextRun> runs_;
// Indicates that |runs_| are valid, set by |ComputeRuns()|.
bool runs_valid_;
DISALLOW_COPY_AND_ASSIGN(RenderTextMac);
};
} // namespace gfx
#endif // UI_GFX_RENDER_TEXT_MAC_H_
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