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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_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 Size GetStringSize() 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 void SetSelectionModel(const SelectionModel& model) OVERRIDE;
virtual void GetGlyphBounds(size_t index,
ui::Range* xspan,
int* height) OVERRIDE;
virtual std::vector<Rect> GetSubstringBounds(ui::Range range) OVERRIDE;
virtual bool IsCursorablePosition(size_t position) OVERRIDE;
virtual void ResetLayout() OVERRIDE;
virtual void EnsureLayout() OVERRIDE;
virtual void DrawVisualText(Canvas* canvas) OVERRIDE;
private:
// Returns the run that contains the character attached to the caret in the
// given selection model. Return NULL if not found.
GSList* GetRunContainingCaret(const SelectionModel& caret) 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);
SelectionModel LastSelectionModelInsideRun(const PangoItem* run);
// 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);
// Convert between indices into text() and indices into |layout_text_|.
size_t TextIndexToLayoutIndex(size_t index) const;
size_t LayoutIndexToTextIndex(size_t index) const;
// Calculate the visual bounds containing the logical substring within the
// given range.
std::vector<Rect> CalculateSubstringBounds(ui::Range range);
// Get the visual bounds of the logical selection.
std::vector<Rect> GetSelectionBounds();
// 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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