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// Copyright (c) 2011 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_WIN_H_
#define UI_GFX_RENDER_TEXT_WIN_H_
#pragma once
#include <usp10.h>
#include "base/memory/scoped_ptr.h"
#include "ui/gfx/render_text.h"
namespace gfx {
namespace internal {
struct TextRun {
TextRun();
ui::Range range;
Font font;
// TODO(msw): Disambiguate color, strike, etc. from TextRuns.
// Otherwise, this breaks the glyph shaping process.
// See the example at: http://www.catch22.net/tuts/neatpad/12.
SkColor foreground;
bool strike;
int width;
// The cumulative widths of preceding runs.
int preceding_run_widths;
SCRIPT_ANALYSIS script_analysis;
scoped_array<WORD> glyphs;
scoped_array<WORD> logical_clusters;
scoped_array<SCRIPT_VISATTR> visible_attributes;
int glyph_count;
scoped_array<int> advance_widths;
scoped_array<GOFFSET> offsets;
ABC abc_widths;
private:
DISALLOW_COPY_AND_ASSIGN(TextRun);
};
} // namespace internal
// RenderTextWin is the Windows implementation of RenderText using Uniscribe.
class RenderTextWin : public RenderText {
public:
RenderTextWin();
virtual ~RenderTextWin();
// Overridden from RenderText:
virtual void SetText(const string16& text) OVERRIDE;
virtual void SetDisplayRect(const Rect& r) OVERRIDE;
virtual void ApplyStyleRange(StyleRange style_range) OVERRIDE;
virtual void ApplyDefaultStyle() OVERRIDE;
virtual int GetStringWidth() OVERRIDE;
virtual void Draw(Canvas* canvas) OVERRIDE;
virtual SelectionModel FindCursorPosition(const Point& point) OVERRIDE;
virtual Rect GetCursorBounds(const SelectionModel& selection,
bool insert_mode) OVERRIDE;
protected:
// Overridden from RenderText:
virtual SelectionModel GetLeftSelectionModel(const SelectionModel& current,
BreakType break_type) OVERRIDE;
virtual SelectionModel GetRightSelectionModel(const SelectionModel& current,
BreakType break_type) OVERRIDE;
virtual SelectionModel LeftEndSelectionModel() OVERRIDE;
virtual SelectionModel RightEndSelectionModel() OVERRIDE;
virtual size_t GetIndexOfPreviousGrapheme(size_t position) OVERRIDE;
virtual std::vector<Rect> GetSubstringBounds(size_t from, size_t to) OVERRIDE;
private:
void ItemizeLogicalText();
void LayoutVisualText(HDC hdc);
// Return the run index that contains the argument; or the length of the
// |runs_| vector if argument exceeds the text length or width.
size_t GetRunContainingPosition(size_t position) const;
size_t GetRunContainingPoint(const Point& point) const;
// Return an index belonging to the |next| or previous logical grapheme.
// The return value is bounded by 0 and the text length, inclusive.
size_t IndexOfAdjacentGrapheme(size_t index, bool next) const;
// Given a |run|, returns the SelectionModel that contains the logical first
// or last caret position inside (not at a boundary of) the run.
// The returned value represents a cursor/caret position without a selection.
SelectionModel FirstSelectionModelInsideRun(internal::TextRun*) const;
SelectionModel LastSelectionModelInsideRun(internal::TextRun*) const;
// Get the selection model visually left/right of |selection| by one grapheme.
// The returned value represents a cursor/caret position without a selection.
SelectionModel LeftSelectionModel(const SelectionModel& selection);
SelectionModel RightSelectionModel(const SelectionModel& selection);
// Draw the text, cursor, and selection.
void DrawSelection(Canvas* canvas);
void DrawVisualText(Canvas* canvas);
void DrawCursor(Canvas* canvas);
bool text_is_dirty_;
bool style_is_dirty_;
// National Language Support native digit and digit substitution settings.
SCRIPT_DIGITSUBSTITUTE digit_substitute_;
SCRIPT_CONTROL script_control_;
SCRIPT_STATE script_state_;
SCRIPT_CACHE script_cache_;
std::vector<internal::TextRun*> runs_;
int string_width_;
scoped_array<int> visual_to_logical_;
scoped_array<int> logical_to_visual_;
DISALLOW_COPY_AND_ASSIGN(RenderTextWin);
};
} // namespace gfx;
#endif // UI_GFX_RENDER_TEXT_WIN_H_
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