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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 <stddef.h>
#include <stdint.h>
#include <string>
#include <vector>
#include "base/mac/scoped_cftyperef.h"
#include "base/macros.h"
#include "ui/gfx/gfx_export.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 GFX_EXPORT RenderTextMac : public RenderText {
public:
RenderTextMac();
~RenderTextMac() override;
// RenderText:
std::unique_ptr<RenderText> CreateInstanceOfSameType() const override;
void SetFontList(const FontList& font_list) override;
bool MultilineSupported() const override;
const base::string16& GetDisplayText() override;
Size GetStringSize() override;
SizeF GetStringSizeF() override;
SelectionModel FindCursorPosition(const Point& point) override;
bool IsSelectionSupported() const override;
std::vector<FontSpan> GetFontSpansForTesting() override;
protected:
// RenderText:
int GetDisplayTextBaseline() override;
SelectionModel AdjacentCharSelectionModel(
const SelectionModel& selection,
VisualCursorDirection direction) override;
SelectionModel AdjacentWordSelectionModel(
const SelectionModel& selection,
VisualCursorDirection direction) override;
Range GetCursorSpan(const Range& text_range) override;
std::vector<Rect> GetSubstringBounds(const Range& range) override;
size_t TextIndexToDisplayIndex(size_t index) override;
size_t DisplayIndexToTextIndex(size_t index) override;
bool IsValidCursorIndex(size_t index) override;
void OnLayoutTextAttributeChanged(bool text_changed) override;
void OnDisplayTextAttributeChanged() override;
void OnTextColorChanged() override;
void EnsureLayout() override;
void DrawVisualText(internal::SkiaTextRenderer* renderer) override;
private:
friend class RenderTextMacTest;
struct TextRun {
CTRunRef ct_run;
SkPoint origin;
std::vector<uint16_t> glyphs;
std::vector<SkPoint> glyph_positions;
SkScalar width;
base::ScopedCFTypeRef<CTFontRef> ct_font;
sk_sp<SkTypeface> typeface;
SkColor foreground;
bool underline;
bool strike;
TextRun();
TextRun(const TextRun& other) = delete;
TextRun(TextRun&& other);
~TextRun();
};
// Returns the width used to draw |layout_text_|.
float GetLayoutTextWidth();
// Computes the size used to draw |line|. Stores the baseline position into
// |baseline|.
gfx::SizeF GetCTLineSize(CTLineRef line, SkScalar* baseline);
// Creates Core Text line object and its attributes for the given text and
// returns the line. |attributes| keeps the ownership of the text attributes.
// See the comments of ArrayStyles() implementation for the ownership details.
base::ScopedCFTypeRef<CTLineRef> EnsureLayoutInternal(
const base::string16& text,
base::ScopedCFTypeRef<CFMutableArrayRef>* attributes);
// Applies RenderText styles to |attr_string| with the given |ct_font|.
// Returns the array of attributes to keep the ownership of the attributes.
// See the comments in .cc file for the details.
base::ScopedCFTypeRef<CFMutableArrayRef> ApplyStyles(
const base::string16& text,
CFMutableAttributedStringRef attr_string,
CTFontRef ct_font);
// Updates |runs_| based on |line_| and sets |runs_valid_| to true.
void ComputeRuns();
// Clears cached style. Doesn't update display text (e.g. eliding).
void InvalidateStyle();
// RenderText:
bool GetDecoratedTextForRange(const Range& range,
DecoratedText* decorated_text) override;
// The Core Text line of text. Created by |EnsureLayout()|.
base::ScopedCFTypeRef<CTLineRef> line_;
// Array to hold CFAttributedString attributes that allows Core Text to hold
// weak references to them without leaking.
base::ScopedCFTypeRef<CFMutableArrayRef> attributes_;
// Visual dimensions of the text. Computed by |EnsureLayout()|.
SizeF 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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