1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
|
// 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 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 AdjacentCharSelectionModel(
const SelectionModel& selection,
VisualCursorDirection direction) OVERRIDE;
virtual SelectionModel AdjacentWordSelectionModel(
const SelectionModel& selection,
VisualCursorDirection direction) OVERRIDE;
virtual SelectionModel EdgeSelectionModel(
VisualCursorDirection direction) OVERRIDE;
virtual std::vector<Rect> GetSubstringBounds(size_t from, size_t to) 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,
LogicalCursorDirection direction) 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 UTF-8 index of the
// |next| or previous grapheme in logical order. Returns 0 if there is no
// previous grapheme, or the |text_| length if there is no next grapheme.
size_t Utf8IndexOfAdjacentGrapheme(size_t utf8_index_of_current_grapheme,
LogicalCursorDirection direction) 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;
// 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);
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|.
std::vector<Rect> CalculateSubstringBounds(size_t from, size_t to);
// 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_
|
