summaryrefslogtreecommitdiff
path: root/accessible/generic/OuterDocAccessible.cpp
blob: a63069355d3332476980549bb3442452063bf0b8 (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
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 "OuterDocAccessible.h"

#include "Accessible-inl.h"
#include "nsAccUtils.h"
#include "DocAccessible-inl.h"
#include "mozilla/a11y/DocAccessibleParent.h"
#include "mozilla/dom/TabParent.h"
#include "Role.h"
#include "States.h"

#ifdef A11Y_LOG
#include "Logging.h"
#endif

using namespace mozilla;
using namespace mozilla::a11y;

////////////////////////////////////////////////////////////////////////////////
// OuterDocAccessible
////////////////////////////////////////////////////////////////////////////////

OuterDocAccessible::
  OuterDocAccessible(nsIContent* aContent, DocAccessible* aDoc) :
  AccessibleWrap(aContent, aDoc)
{
  mType = eOuterDocType;

  // Request document accessible for the content document to make sure it's
  // created. It will appended to outerdoc accessible children asynchronously.
  nsIDocument* outerDoc = mContent->GetUncomposedDoc();
  if (outerDoc) {
    nsIDocument* innerDoc = outerDoc->GetSubDocumentFor(mContent);
    if (innerDoc)
      GetAccService()->GetDocAccessible(innerDoc);
  }
}

OuterDocAccessible::~OuterDocAccessible()
{
}

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

NS_IMPL_ISUPPORTS_INHERITED0(OuterDocAccessible,
                             Accessible)

////////////////////////////////////////////////////////////////////////////////
// Accessible public (DON'T add methods here)

role
OuterDocAccessible::NativeRole()
{
  return roles::INTERNAL_FRAME;
}

Accessible*
OuterDocAccessible::ChildAtPoint(int32_t aX, int32_t aY,
                                 EWhichChildAtPoint aWhichChild)
{
  nsIntRect docRect = Bounds();
  if (aX < docRect.x || aX >= docRect.x + docRect.width ||
      aY < docRect.y || aY >= docRect.y + docRect.height)
    return nullptr;

  // Always return the inner doc as direct child accessible unless bounds
  // outside of it.
  Accessible* child = GetChildAt(0);
  NS_ENSURE_TRUE(child, nullptr);

  if (aWhichChild == eDeepestChild)
    return child->ChildAtPoint(aX, aY, eDeepestChild);
  return child;
}

////////////////////////////////////////////////////////////////////////////////
// Accessible public

void
OuterDocAccessible::Shutdown()
{
#ifdef A11Y_LOG
  if (logging::IsEnabled(logging::eDocDestroy))
    logging::OuterDocDestroy(this);
#endif

  Accessible* child = mChildren.SafeElementAt(0, nullptr);
  if (child) {
#ifdef A11Y_LOG
    if (logging::IsEnabled(logging::eDocDestroy)) {
      logging::DocDestroy("outerdoc's child document rebind is scheduled",
                          child->AsDoc()->DocumentNode());
    }
#endif
    RemoveChild(child);

    // XXX: sometimes outerdoc accessible is shutdown because of layout style
    // change however the presshell of underlying document isn't destroyed and
    // the document doesn't get pagehide events. Schedule a document rebind
    // to its parent document. Otherwise a document accessible may be lost if
    // its outerdoc has being recreated (see bug 862863 for details).
    if (!mDoc->IsDefunct()) {
      mDoc->BindChildDocument(child->AsDoc());
    }
  }

  AccessibleWrap::Shutdown();
}

bool
OuterDocAccessible::InsertChildAt(uint32_t aIdx, Accessible* aAccessible)
{
  MOZ_RELEASE_ASSERT(aAccessible->IsDoc(),
                     "OuterDocAccessible can have a document child only!");

  // We keep showing the old document for a bit after creating the new one,
  // and while building the new DOM and frame tree. That's done on purpose
  // to avoid weird flashes of default background color.
  // The old viewer will be destroyed after the new one is created.
  // For a11y, it should be safe to shut down the old document now.
  if (mChildren.Length())
    mChildren[0]->Shutdown();

  if (!AccessibleWrap::InsertChildAt(0, aAccessible))
    return false;

#ifdef A11Y_LOG
  if (logging::IsEnabled(logging::eDocCreate)) {
    logging::DocCreate("append document to outerdoc",
                       aAccessible->AsDoc()->DocumentNode());
    logging::Address("outerdoc", this);
  }
#endif

  return true;
}

bool
OuterDocAccessible::RemoveChild(Accessible* aAccessible)
{
  Accessible* child = mChildren.SafeElementAt(0, nullptr);
  if (child != aAccessible) {
    NS_ERROR("Wrong child to remove!");
    return false;
  }

#ifdef A11Y_LOG
  if (logging::IsEnabled(logging::eDocDestroy)) {
    logging::DocDestroy("remove document from outerdoc",
                        child->AsDoc()->DocumentNode(), child->AsDoc());
    logging::Address("outerdoc", this);
  }
#endif

  bool wasRemoved = AccessibleWrap::RemoveChild(child);

  NS_ASSERTION(!mChildren.Length(),
               "This child document of outerdoc accessible wasn't removed!");

  return wasRemoved;
}

bool
OuterDocAccessible::IsAcceptableChild(nsIContent* aEl) const
{
  // outer document accessible doesn't not participate in ordinal tree
  // mutations.
  return false;
}

#if defined(XP_WIN)

// On Windows e10s, since we don't cache in the chrome process, these next two
// functions must be implemented so that we properly cross the chrome-to-content
// boundary when traversing.

uint32_t
OuterDocAccessible::ChildCount() const
{
  uint32_t result = mChildren.Length();
  if (!result && RemoteChildDoc()) {
    result = 1;
  }
  return result;
}

Accessible*
OuterDocAccessible::GetChildAt(uint32_t aIndex) const
{
  Accessible* result = AccessibleWrap::GetChildAt(aIndex);
  if (result || aIndex) {
    return result;
  }
  // If we are asking for child 0 and GetChildAt doesn't return anything, try
  // to get the remote child doc and return that instead.
  ProxyAccessible* remoteChild = RemoteChildDoc();
  if (!remoteChild) {
    return nullptr;
  }
  return WrapperFor(remoteChild);
}

#endif // defined(XP_WIN)

ProxyAccessible*
OuterDocAccessible::RemoteChildDoc() const
{
  dom::TabParent* tab = dom::TabParent::GetFrom(GetContent());
  if (!tab)
    return nullptr;

  return tab->GetTopLevelDocAccessible();
}