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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_PANGO_H_
#define UI_GFX_RENDER_TEXT_PANGO_H_
#include <pango/pango.h>
#include <vector>
#include "ui/gfx/render_text.h"
namespace gfx {
// RenderTextPango is the Linux implementation of RenderText using Pango.
class RenderTextPango : public RenderText {
public:
RenderTextPango();
~RenderTextPango() override;
// Overridden from RenderText:
scoped_ptr<RenderText> CreateInstanceOfSameType() const override;
Size GetStringSize() override;
SelectionModel FindCursorPosition(const Point& point) override;
std::vector<FontSpan> GetFontSpansForTesting() override;
protected:
// Overridden from RenderText:
int GetLayoutTextBaseline() override;
SelectionModel AdjacentCharSelectionModel(
const SelectionModel& selection,
VisualCursorDirection direction) override;
SelectionModel AdjacentWordSelectionModel(
const SelectionModel& selection,
VisualCursorDirection direction) override;
Range GetGlyphBounds(size_t index) override;
std::vector<Rect> GetSubstringBounds(const Range& range) override;
size_t TextIndexToLayoutIndex(size_t index) const override;
size_t LayoutIndexToTextIndex(size_t index) const override;
bool IsValidCursorIndex(size_t index) override;
void ResetLayout() override;
void EnsureLayout() override;
void DrawVisualText(Canvas* canvas) override;
private:
friend class RenderTextTest;
FRIEND_TEST_ALL_PREFIXES(RenderTextTest, PangoAttributes);
// 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);
// Get the text index corresponding to the |run|'s |glyph_index|.
size_t GetGlyphTextIndex(PangoLayoutRun* run, int glyph_index) const;
// 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_;
// The text in the |layout_|.
const char* layout_text_;
DISALLOW_COPY_AND_ASSIGN(RenderTextPango);
};
} // namespace gfx
#endif // UI_GFX_RENDER_TEXT_PANGO_H_
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