1 // Copyright 2014 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 #include "content/browser/frame_host/frame_accessibility.h"
6
7 #include "content/browser/frame_host/frame_tree.h"
8 #include "content/browser/frame_host/frame_tree_node.h"
9 #include "content/browser/frame_host/render_frame_host_delegate.h"
10 #include "content/browser/frame_host/render_frame_host_impl.h"
11 #include "content/public/browser/browser_context.h"
12
13 namespace content {
14
15 // static
GetInstance()16 FrameAccessibility* FrameAccessibility::GetInstance() {
17 return Singleton<FrameAccessibility>::get();
18 }
19
ChildFrameMapping()20 FrameAccessibility::ChildFrameMapping::ChildFrameMapping()
21 : parent_frame_host(NULL),
22 accessibility_node_id(0),
23 child_frame_tree_node_id(0),
24 browser_plugin_instance_id(0) {}
25
FrameAccessibility()26 FrameAccessibility::FrameAccessibility() {}
27
~FrameAccessibility()28 FrameAccessibility::~FrameAccessibility() {}
29
AddChildFrame(RenderFrameHostImpl * parent_frame_host,int accessibility_node_id,int64 child_frame_tree_node_id)30 void FrameAccessibility::AddChildFrame(
31 RenderFrameHostImpl* parent_frame_host,
32 int accessibility_node_id,
33 int64 child_frame_tree_node_id) {
34 for (std::vector<ChildFrameMapping>::iterator iter = mappings_.begin();
35 iter != mappings_.end();
36 ++iter) {
37 // TODO(dmazzoni): the renderer should keep track of these mappings
38 // and clear an existing mapping before setting a new one, that would
39 // be safer than just updating existing mappings. http://crbug.com/413464
40 if (iter->parent_frame_host == parent_frame_host &&
41 (iter->accessibility_node_id == accessibility_node_id ||
42 iter->child_frame_tree_node_id == child_frame_tree_node_id)) {
43 iter->accessibility_node_id = accessibility_node_id;
44 iter->child_frame_tree_node_id = child_frame_tree_node_id;
45 return;
46 }
47 }
48
49 ChildFrameMapping new_mapping;
50 new_mapping.parent_frame_host = parent_frame_host;
51 new_mapping.accessibility_node_id = accessibility_node_id;
52 new_mapping.child_frame_tree_node_id = child_frame_tree_node_id;
53 mappings_.push_back(new_mapping);
54 }
55
AddGuestWebContents(RenderFrameHostImpl * parent_frame_host,int accessibility_node_id,int browser_plugin_instance_id)56 void FrameAccessibility::AddGuestWebContents(
57 RenderFrameHostImpl* parent_frame_host,
58 int accessibility_node_id,
59 int browser_plugin_instance_id) {
60 for (std::vector<ChildFrameMapping>::iterator iter = mappings_.begin();
61 iter != mappings_.end();
62 ++iter) {
63 // TODO(dmazzoni): the renderer should keep track of these mappings
64 // and clear an existing mapping before setting a new one, that would
65 // be safer than just updating existing mappings. http://crbug.com/413464
66 if (iter->parent_frame_host == parent_frame_host &&
67 (iter->accessibility_node_id == accessibility_node_id ||
68 iter->browser_plugin_instance_id == browser_plugin_instance_id)) {
69 iter->accessibility_node_id = accessibility_node_id;
70 iter->browser_plugin_instance_id = browser_plugin_instance_id;
71 return;
72 }
73 }
74
75 ChildFrameMapping new_mapping;
76 new_mapping.parent_frame_host = parent_frame_host;
77 new_mapping.accessibility_node_id = accessibility_node_id;
78 new_mapping.browser_plugin_instance_id = browser_plugin_instance_id;
79 mappings_.push_back(new_mapping);
80 }
81
OnRenderFrameHostDestroyed(RenderFrameHostImpl * render_frame_host)82 void FrameAccessibility::OnRenderFrameHostDestroyed(
83 RenderFrameHostImpl* render_frame_host) {
84 // Since the order doesn't matter, the fastest way to remove all items
85 // with this render_frame_host is to iterate over the vector backwards,
86 // swapping each one with the back element if we need to delete it.
87 int initial_len = static_cast<int>(mappings_.size());
88 for (int i = initial_len - 1; i >= 0; i--) {
89 if (mappings_[i].parent_frame_host == render_frame_host) {
90 mappings_[i] = mappings_.back();
91 mappings_.pop_back();
92 }
93 }
94 }
95
GetChild(RenderFrameHostImpl * parent_frame_host,int accessibility_node_id)96 RenderFrameHostImpl* FrameAccessibility::GetChild(
97 RenderFrameHostImpl* parent_frame_host,
98 int accessibility_node_id) {
99 for (std::vector<ChildFrameMapping>::iterator iter = mappings_.begin();
100 iter != mappings_.end();
101 ++iter) {
102 if (iter->parent_frame_host != parent_frame_host ||
103 iter->accessibility_node_id != accessibility_node_id) {
104 continue;
105 }
106
107 if (iter->child_frame_tree_node_id) {
108 FrameTreeNode* child_node =
109 FrameTree::GloballyFindByID(iter->child_frame_tree_node_id);
110 if (!child_node)
111 return NULL;
112
113 // We should have gotten a node in the same frame tree.
114 if (child_node->frame_tree() !=
115 parent_frame_host->frame_tree_node()->frame_tree()) {
116 NOTREACHED();
117 return NULL;
118 }
119
120 return child_node->current_frame_host();
121 }
122
123 if (iter->browser_plugin_instance_id) {
124 RenderFrameHost* guest =
125 parent_frame_host->delegate()->GetGuestByInstanceID(
126 iter->browser_plugin_instance_id);
127 if (guest)
128 return static_cast<RenderFrameHostImpl*>(guest);
129 }
130 }
131
132 return NULL;
133 }
134
GetParent(RenderFrameHostImpl * child_frame_host,RenderFrameHostImpl ** out_parent_frame_host,int * out_accessibility_node_id)135 bool FrameAccessibility::GetParent(
136 RenderFrameHostImpl* child_frame_host,
137 RenderFrameHostImpl** out_parent_frame_host,
138 int* out_accessibility_node_id) {
139 for (std::vector<ChildFrameMapping>::iterator iter = mappings_.begin();
140 iter != mappings_.end();
141 ++iter) {
142 if (iter->child_frame_tree_node_id) {
143 FrameTreeNode* child_node =
144 FrameTree::GloballyFindByID(iter->child_frame_tree_node_id);
145 if (child_node &&
146 child_node->current_frame_host() == child_frame_host) {
147 // We should have gotten a node in the same frame tree.
148 if (child_node->frame_tree() !=
149 iter->parent_frame_host->frame_tree_node()->frame_tree()) {
150 NOTREACHED();
151 return false;
152 }
153
154 if (out_parent_frame_host)
155 *out_parent_frame_host = iter->parent_frame_host;
156 if (out_accessibility_node_id)
157 *out_accessibility_node_id = iter->accessibility_node_id;
158 return true;
159 }
160 }
161
162 if (iter->browser_plugin_instance_id) {
163 RenderFrameHost* guest =
164 iter->parent_frame_host->delegate()->GetGuestByInstanceID(
165 iter->browser_plugin_instance_id);
166 if (guest == child_frame_host) {
167 if (out_parent_frame_host)
168 *out_parent_frame_host = iter->parent_frame_host;
169 if (out_accessibility_node_id)
170 *out_accessibility_node_id = iter->accessibility_node_id;
171 return true;
172 }
173 }
174 }
175
176 return false;
177 }
178
179 } // namespace content
180