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Side by Side Diff: Source/core/editing/GranularityStrategy.h

Issue 988023005: Implementing directional selection strategy in Blink. (Closed) Base URL: https://chromium.googlesource.com/chromium/blink.git@master
Patch Set: Addressing nits Created 5 years, 8 months ago
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1 // Copyright 2015 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #ifndef GranularityStrategy_h
6 #define GranularityStrategy_h
7
8 #include "core/editing/SelectionStrategy.h"
9 #include "core/editing/VisibleSelection.h"
10
11 namespace blink {
12
13 class GranularityStrategy {
14 public:
15 virtual ~GranularityStrategy();
16 virtual SelectionStrategy GetType() const = 0;
17 virtual void Clear() = 0;
18
19 // Calculates and returns the new selection based on the updated user
20 // selection extent |extentPosition| and the granularity strategy.
21 virtual VisibleSelection updateExtent(const VisiblePosition& extentPosition, const VisibleSelection&) = 0;
22
23 protected:
24 GranularityStrategy();
25 };
26
27 // Always uses character granularity.
28 class CharacterGranularityStrategy final : public GranularityStrategy {
29 public:
30 CharacterGranularityStrategy();
31 ~CharacterGranularityStrategy() final;
32
33 // GranularityStrategy:
34 SelectionStrategy GetType() const final;
35 void Clear() final;
36 VisibleSelection updateExtent(const VisiblePosition& extentPosition, const V isibleSelection&) final;
37 };
38
39 // "Expand by word, shrink by character" selection strategy.
40 // Uses character granularity when selection is shrinking. If the selection is
41 // expanding, granularity doesn't change until a word boundary is passed, after
42 // which the granularity switches to "word".
43 class DirectionGranularityStrategy final : public GranularityStrategy {
44 public:
45 DirectionGranularityStrategy();
46 ~DirectionGranularityStrategy() final;
47
48 // GranularityStrategy:
49 SelectionStrategy GetType() const final;
50 void Clear() final;
51 VisibleSelection updateExtent(const VisiblePosition&, const VisibleSelection &) final;
52
53 private:
54 enum class BoundAdjust {CurrentPosIfOnBound, NextBoundIfOnBound};
55 enum class SearchDirection {SearchBackwards, SearchForward};
56
57 // Returns the next word boundary starting from |pos|. |direction| specifies
58 // the direction in which to search for the next bound. nextIfOnBound
59 // controls whether |pos| or the next boundary is returned when |pos| is
60 // located exactly on word boundary.
61 VisiblePosition nextWordBound(const VisiblePosition& /*pos*/, SearchDirectio n /*direction*/, BoundAdjust /*nextIfOnBound*/);
62
63 // Current selection granularity being used
64 TextGranularity m_granularity;
65 // Set to true if the selection was shrunk (without changing relative
66 // base/extent order) as a result of the most recent updateExtent call.
67 bool m_lastMoveShrunkSelection;
68 };
69
70 } // namespace blink
71
72 #endif // GranularityStrategy_h
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