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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_LINUX_H_
#define UI_GFX_RENDER_TEXT_LINUX_H_
#pragma once
#include <pango/pango.h>
#include <vector>
#include "ui/gfx/render_text.h"
namespace gfx {
// RenderTextLinux is the Linux implementation of RenderText using Pango.
class RenderTextLinux : public RenderText {
public:
RenderTextLinux();
virtual ~RenderTextLinux();
// Overridden from RenderText:
virtual base::i18n::TextDirection GetTextDirection() OVERRIDE;
virtual int GetStringWidth() OVERRIDE;
virtual SelectionModel FindCursorPosition(const Point& point) OVERRIDE;
virtual Rect GetCursorBounds(const SelectionModel& position,
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 void GetSubstringBounds(size_t from,
size_t to,
std::vector<Rect>* bounds) OVERRIDE;
virtual void SetSelectionModel(const SelectionModel& model) OVERRIDE;
virtual bool IsCursorablePosition(size_t position) OVERRIDE;
virtual void UpdateLayout() OVERRIDE;
virtual void EnsureLayout() OVERRIDE;
virtual void DrawVisualText(Canvas* canvas) OVERRIDE;
private:
virtual size_t IndexOfAdjacentGrapheme(size_t index, bool next) OVERRIDE;
// Returns the run that contains |position|. Return NULL if not found.
GSList* GetRunContainingPosition(size_t position) const;
// Given |utf8_index_of_current_grapheme|, returns the UTF8 or UTF16 index of
// next grapheme in the text if |next| is true, otherwise, returns the index
// of previous grapheme. Returns 0 if there is no previous grapheme, and
// returns the |text_| length if there is no next grapheme.
size_t Utf8IndexOfAdjacentGrapheme(size_t utf8_index_of_current_grapheme,
bool next) const;
size_t Utf16IndexOfAdjacentGrapheme(size_t utf8_index_of_current_grapheme,
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(const PangoItem* run) const;
SelectionModel LastSelectionModelInsideRun(const PangoItem* run) const;
// Get the selection model visually left or right of |current| by one
// grapheme.
// The returned value represents a cursor/caret position without a selection.
SelectionModel LeftSelectionModel(const SelectionModel& current);
SelectionModel RightSelectionModel(const SelectionModel& current);
// Get the selection model visually left or right of |current| by one word.
// The returned value represents a cursor/caret position without a selection.
SelectionModel LeftSelectionModelByWord(const SelectionModel& current);
SelectionModel RightSelectionModelByWord(const SelectionModel& current);
// Unref |layout_| and |pango_line_|. Set them to NULL.
void ResetLayout();
// Setup pango attribute: foreground, background, font, strike.
void SetupPangoAttributes(PangoLayout* layout);
// Append one pango attribute |pango_attr| into pango attribute list |attrs|.
void AppendPangoAttribute(size_t start,
size_t end,
PangoAttribute* pango_attr,
PangoAttrList* attrs);
// Returns |run|'s visually previous run.
// The complexity is O(n) since it is a single-linked list.
PangoLayoutRun* GetPreviousRun(PangoLayoutRun* run) const;
// Returns the last run in |current_line_|.
// The complexity is O(n) since it is a single-linked list.
PangoLayoutRun* GetLastRun() const;
size_t Utf16IndexToUtf8Index(size_t index) const;
size_t Utf8IndexToUtf16Index(size_t index) const;
// Calculate the visual bounds containing the logical substring within |from|
// to |to| into |bounds|.
void CalculateSubstringBounds(size_t from,
size_t to,
std::vector<Rect>* bounds);
// Save the visual bounds of logical selection into |bounds|.
void GetSelectionBounds(std::vector<Rect>* bounds);
// Pango Layout.
PangoLayout* layout_;
// A single line layout resulting from laying out via |layout_|.
PangoLayoutLine* current_line_;
// Information about character attributes.
PangoLogAttr* log_attrs_;
// Number of attributes in |log_attrs_|.
int num_log_attrs_;
// Vector of the visual bounds containing the logical substring of selection.
std::vector<Rect> selection_visual_bounds_;
// The text in the |layout_|.
const char* layout_text_;
// The text length.
size_t layout_text_len_;
DISALLOW_COPY_AND_ASSIGN(RenderTextLinux);
};
} // namespace gfx
#endif // UI_GFX_RENDER_TEXT_LINUX_H_
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