summaryrefslogtreecommitdiffstats
path: root/accessible/xpcom/xpcAccessiblePivot.cpp
blob: 862cb88bddf46210c61e60cd1a7918e4ae2730a5 (plain)
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
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "xpcAccessiblePivot.h"
#include "xpcAccessibleDocument.h"

#include "Pivot.h"

using namespace mozilla::a11y;

using mozilla::DebugOnly;

/**
 * An object that stores a given traversal rule during the pivot movement.
 */
class xpcPivotRule : public PivotRule {
 public:
  explicit xpcPivotRule(nsIAccessibleTraversalRule* aRule) : mRule(aRule) {}
  ~xpcPivotRule() {}

  virtual uint16_t Match(Accessible* aAcc) override;

 private:
  nsCOMPtr<nsIAccessibleTraversalRule> mRule;
};

////////////////////////////////////////////////////////////////////////////////
// xpcAccessiblePivot

xpcAccessiblePivot::xpcAccessiblePivot(nsIAccessible* aRoot) : mRoot(aRoot) {
  NS_ASSERTION(aRoot, "A root accessible is required");
}

xpcAccessiblePivot::~xpcAccessiblePivot() {}

////////////////////////////////////////////////////////////////////////////////
// nsISupports

NS_IMPL_CYCLE_COLLECTION(xpcAccessiblePivot, mRoot)

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(xpcAccessiblePivot)
  NS_INTERFACE_MAP_ENTRY(nsIAccessiblePivot)
  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIAccessiblePivot)
NS_INTERFACE_MAP_END

NS_IMPL_CYCLE_COLLECTING_ADDREF(xpcAccessiblePivot)
NS_IMPL_CYCLE_COLLECTING_RELEASE(xpcAccessiblePivot)

////////////////////////////////////////////////////////////////////////////////
// nsIAccessiblePivot

NS_IMETHODIMP
xpcAccessiblePivot::Next(nsIAccessible* aAnchor,
                         nsIAccessibleTraversalRule* aRule, bool aIncludeStart,
                         uint8_t aArgc, nsIAccessible** aResult) {
  NS_ENSURE_ARG(aResult);
  NS_ENSURE_ARG(aRule);

  Accessible* root = Root();
  Accessible* anchor = aAnchor->ToInternalGeneric();
  NS_ENSURE_TRUE(root && anchor, NS_ERROR_NOT_IN_TREE);

  Pivot pivot(Root());
  xpcPivotRule rule(aRule);
  Accessible* result =
      pivot.Next(anchor, rule, (aArgc > 0) ? aIncludeStart : false);
  NS_IF_ADDREF(*aResult = ToXPC(result));

  return NS_OK;
}

NS_IMETHODIMP
xpcAccessiblePivot::Prev(nsIAccessible* aAnchor,
                         nsIAccessibleTraversalRule* aRule, bool aIncludeStart,
                         uint8_t aArgc, nsIAccessible** aResult) {
  NS_ENSURE_ARG(aResult);
  NS_ENSURE_ARG(aRule);

  Accessible* root = Root();
  Accessible* anchor = aAnchor->ToInternalGeneric();
  NS_ENSURE_TRUE(root && anchor, NS_ERROR_NOT_IN_TREE);

  Pivot pivot(Root());
  xpcPivotRule rule(aRule);
  Accessible* result =
      pivot.Prev(anchor, rule, (aArgc > 0) ? aIncludeStart : false);
  NS_IF_ADDREF(*aResult = ToXPC(result));

  return NS_OK;
}

NS_IMETHODIMP
xpcAccessiblePivot::First(nsIAccessibleTraversalRule* aRule,
                          nsIAccessible** aResult) {
  NS_ENSURE_ARG(aResult);
  NS_ENSURE_ARG(aRule);

  Accessible* root = Root();
  NS_ENSURE_TRUE(root, NS_ERROR_NOT_IN_TREE);

  Pivot pivot(root);
  xpcPivotRule rule(aRule);
  Accessible* result = pivot.First(rule);
  NS_IF_ADDREF(*aResult = ToXPC(result));

  return NS_OK;
}

NS_IMETHODIMP
xpcAccessiblePivot::Last(nsIAccessibleTraversalRule* aRule,
                         nsIAccessible** aResult) {
  NS_ENSURE_ARG(aResult);
  NS_ENSURE_ARG(aRule);

  Accessible* root = Root();
  NS_ENSURE_TRUE(root, NS_ERROR_NOT_IN_TREE);

  Pivot pivot(root);
  xpcPivotRule rule(aRule);
  Accessible* result = pivot.Last(rule);
  NS_IF_ADDREF(*aResult = ToXPC(result));

  return NS_OK;
}

NS_IMETHODIMP
xpcAccessiblePivot::AtPoint(int32_t aX, int32_t aY,
                            nsIAccessibleTraversalRule* aRule,
                            nsIAccessible** aResult) {
  NS_ENSURE_ARG_POINTER(aResult);
  NS_ENSURE_ARG_POINTER(aRule);

  Accessible* root = Root();
  NS_ENSURE_TRUE(root, NS_ERROR_NOT_IN_TREE);

  xpcPivotRule rule(aRule);
  Pivot pivot(root);

  Accessible* result = pivot.AtPoint(aX, aY, rule);
  NS_IF_ADDREF(*aResult = ToXPC(result));

  return NS_OK;
}

uint16_t xpcPivotRule::Match(Accessible* aAcc) {
  uint16_t matchResult = nsIAccessibleTraversalRule::FILTER_IGNORE;

  DebugOnly<nsresult> rv = mRule->Match(ToXPC(aAcc), &matchResult);
  MOZ_ASSERT(NS_SUCCEEDED(rv));

  return matchResult;
}