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// Copyright 2014 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.
#include "content/browser/frame_host/frame_accessibility.h"
#include "content/browser/frame_host/frame_tree.h"
#include "content/browser/frame_host/frame_tree_node.h"
#include "content/browser/frame_host/render_frame_host_delegate.h"
#include "content/browser/frame_host/render_frame_host_impl.h"
#include "content/public/browser/browser_context.h"
namespace content {
// static
FrameAccessibility* FrameAccessibility::GetInstance() {
return Singleton<FrameAccessibility>::get();
}
FrameAccessibility::ChildFrameMapping::ChildFrameMapping()
: parent_frame_host(nullptr),
accessibility_node_id(0),
child_frame_tree_node_id(0),
browser_plugin_instance_id(0) {}
FrameAccessibility::FrameAccessibility() {}
FrameAccessibility::~FrameAccessibility() {}
void FrameAccessibility::AddChildFrame(
RenderFrameHostImpl* parent_frame_host,
int accessibility_node_id,
int64 child_frame_tree_node_id) {
for (std::vector<ChildFrameMapping>::iterator iter = mappings_.begin();
iter != mappings_.end();
++iter) {
// TODO(dmazzoni): the renderer should keep track of these mappings
// and clear an existing mapping before setting a new one, that would
// be safer than just updating existing mappings. http://crbug.com/413464
if (iter->parent_frame_host == parent_frame_host &&
(iter->accessibility_node_id == accessibility_node_id ||
iter->child_frame_tree_node_id == child_frame_tree_node_id)) {
iter->accessibility_node_id = accessibility_node_id;
iter->child_frame_tree_node_id = child_frame_tree_node_id;
return;
}
}
ChildFrameMapping new_mapping;
new_mapping.parent_frame_host = parent_frame_host;
new_mapping.accessibility_node_id = accessibility_node_id;
new_mapping.child_frame_tree_node_id = child_frame_tree_node_id;
mappings_.push_back(new_mapping);
}
void FrameAccessibility::AddGuestWebContents(
RenderFrameHostImpl* parent_frame_host,
int accessibility_node_id,
int browser_plugin_instance_id) {
for (std::vector<ChildFrameMapping>::iterator iter = mappings_.begin();
iter != mappings_.end();
++iter) {
// TODO(dmazzoni): the renderer should keep track of these mappings
// and clear an existing mapping before setting a new one, that would
// be safer than just updating existing mappings. http://crbug.com/413464
if (iter->parent_frame_host == parent_frame_host &&
(iter->accessibility_node_id == accessibility_node_id ||
iter->browser_plugin_instance_id == browser_plugin_instance_id)) {
iter->accessibility_node_id = accessibility_node_id;
iter->browser_plugin_instance_id = browser_plugin_instance_id;
return;
}
}
ChildFrameMapping new_mapping;
new_mapping.parent_frame_host = parent_frame_host;
new_mapping.accessibility_node_id = accessibility_node_id;
new_mapping.browser_plugin_instance_id = browser_plugin_instance_id;
mappings_.push_back(new_mapping);
}
void FrameAccessibility::OnRenderFrameHostDestroyed(
RenderFrameHostImpl* render_frame_host) {
// Since the order doesn't matter, the fastest way to remove all items
// with this render_frame_host is to iterate over the vector backwards,
// swapping each one with the back element if we need to delete it.
int initial_len = static_cast<int>(mappings_.size());
for (int i = initial_len - 1; i >= 0; i--) {
if (mappings_[i].parent_frame_host == render_frame_host) {
mappings_[i] = mappings_.back();
mappings_.pop_back();
}
}
}
RenderFrameHostImpl* FrameAccessibility::GetChild(
RenderFrameHostImpl* parent_frame_host,
int accessibility_node_id) {
for (std::vector<ChildFrameMapping>::iterator iter = mappings_.begin();
iter != mappings_.end();
++iter) {
if (iter->parent_frame_host != parent_frame_host ||
iter->accessibility_node_id != accessibility_node_id) {
continue;
}
if (iter->child_frame_tree_node_id) {
return GetRFHIFromFrameTreeNodeId(
parent_frame_host, iter->child_frame_tree_node_id);
}
if (iter->browser_plugin_instance_id) {
RenderFrameHost* guest =
parent_frame_host->delegate()->GetGuestByInstanceID(
iter->browser_plugin_instance_id);
if (guest)
return static_cast<RenderFrameHostImpl*>(guest);
}
}
return nullptr;
}
void FrameAccessibility::GetAllChildFrames(
RenderFrameHostImpl* parent_frame_host,
std::vector<RenderFrameHostImpl*>* child_frame_hosts) {
CHECK(child_frame_hosts);
for (std::vector<ChildFrameMapping>::iterator iter = mappings_.begin();
iter != mappings_.end();
++iter) {
if (iter->parent_frame_host != parent_frame_host)
continue;
if (iter->child_frame_tree_node_id) {
RenderFrameHostImpl* child_frame_host = GetRFHIFromFrameTreeNodeId(
parent_frame_host, iter->child_frame_tree_node_id);
if (child_frame_host)
child_frame_hosts->push_back(child_frame_host);
}
if (iter->browser_plugin_instance_id) {
RenderFrameHost* guest =
parent_frame_host->delegate()->GetGuestByInstanceID(
iter->browser_plugin_instance_id);
if (guest)
child_frame_hosts->push_back(static_cast<RenderFrameHostImpl*>(guest));
}
}
}
bool FrameAccessibility::GetParent(
RenderFrameHostImpl* child_frame_host,
RenderFrameHostImpl** out_parent_frame_host,
int* out_accessibility_node_id) {
for (std::vector<ChildFrameMapping>::iterator iter = mappings_.begin();
iter != mappings_.end();
++iter) {
if (iter->child_frame_tree_node_id) {
FrameTreeNode* child_node =
FrameTree::GloballyFindByID(iter->child_frame_tree_node_id);
if (child_node &&
child_node->current_frame_host() == child_frame_host) {
// Assert that the child node is a descendant of the parent frame in
// the frame tree. It may not be a direct descendant because the
// parent frame's accessibility tree may span multiple frames from the
// same origin.
FrameTreeNode* parent_node = iter->parent_frame_host->frame_tree_node();
FrameTreeNode* child_node_ancestor = child_node->parent();
while (child_node_ancestor && child_node_ancestor != parent_node)
child_node_ancestor = child_node_ancestor->parent();
if (child_node_ancestor != parent_node) {
NOTREACHED();
return false;
}
if (out_parent_frame_host)
*out_parent_frame_host = iter->parent_frame_host;
if (out_accessibility_node_id)
*out_accessibility_node_id = iter->accessibility_node_id;
return true;
}
}
if (iter->browser_plugin_instance_id) {
RenderFrameHost* guest =
iter->parent_frame_host->delegate()->GetGuestByInstanceID(
iter->browser_plugin_instance_id);
if (guest == child_frame_host) {
if (out_parent_frame_host)
*out_parent_frame_host = iter->parent_frame_host;
if (out_accessibility_node_id)
*out_accessibility_node_id = iter->accessibility_node_id;
return true;
}
}
}
return false;
}
RenderFrameHostImpl* FrameAccessibility::GetRFHIFromFrameTreeNodeId(
RenderFrameHostImpl* parent_frame_host,
int64 child_frame_tree_node_id) {
FrameTreeNode* child_node =
FrameTree::GloballyFindByID(child_frame_tree_node_id);
if (!child_node)
return nullptr;
// Assert that the child node is a descendant of the parent frame in
// the frame tree. It may not be a direct descendant because the
// parent frame's accessibility tree may span multiple frames from the
// same origin.
FrameTreeNode* parent_node = parent_frame_host->frame_tree_node();
FrameTreeNode* child_node_ancestor = child_node->parent();
while (child_node_ancestor && child_node_ancestor != parent_node)
child_node_ancestor = child_node_ancestor->parent();
if (child_node_ancestor != parent_node) {
NOTREACHED();
return nullptr;
}
return child_node->current_frame_host();
}
} // namespace content
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