blob: a1901681538944c574c96837e471f2bd4089cb0f [file] [log] [blame]
// 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 "chromecast/browser/ui/aura/accessibility/ax_tree_source_aura.h"
#include <stddef.h>
#include <vector>
#include "chromecast/browser/ui/aura/accessibility/automation_manager_aura.h"
#include "content/public/browser/render_frame_host.h"
#include "content/public/browser/render_process_host.h"
#include "content/public/browser/web_contents.h"
#include "ui/accessibility/ax_action_data.h"
#include "ui/views/accessibility/ax_aura_obj_cache.h"
#include "ui/views/accessibility/ax_aura_obj_wrapper.h"
#include "ui/views/accessibility/ax_view_obj_wrapper.h"
#if defined(TOOLKIT_VIEWS)
#include "ui/views/controls/webview/webview.h" // nogncheck
using views::AXAuraObjCache;
using views::AXAuraObjWrapper;
AXTreeSourceAura::AXTreeSourceAura() {
root_.reset(new AXRootObjWrapper());
AXTreeSourceAura::~AXTreeSourceAura() {
bool AXTreeSourceAura::HandleAccessibleAction(const ui::AXActionData& action) {
int id = action.target_node_id;
// In Views, we only support setting the selection within a single node,
// not across multiple nodes like on the web.
if (action.action == ax::mojom::Action::kSetSelection) {
if (action.anchor_node_id != action.focus_node_id) {
return false;
id = action.anchor_node_id;
AXAuraObjWrapper* obj = AXAuraObjCache::GetInstance()->Get(id);
if (obj)
return obj->HandleAccessibleAction(action);
return false;
bool AXTreeSourceAura::GetTreeData(ui::AXTreeData* tree_data) const {
tree_data->tree_id = 0;
tree_data->loaded = true;
tree_data->loading_progress = 1.0;
AXAuraObjWrapper* focus = AXAuraObjCache::GetInstance()->GetFocus();
// TODO(b/111911092): AXTreeData::focus_id represents the node within the
// tree with 'keyboard focus'. We have no keyboard focus on chromecast so
// this is being left as -1. This prevents getFocus calls from the chromevox
// background page from finding any window in focus and interferes with
// gesture event processing. Since we only ever have one top level window
// and one ax tree, temporarily returning 1 here to indicate the root node is
// always the focused window. A better solution would be to fix the focus
// issues on chromecast which relies on a) the root window to be focused via
// Focus() and 2) a native widget being registered with the root window so
// the above GetFocus call will work. When this code is re-unified with
// chrome, this will need to be a special case for chromecast unless the
// better solution described above is implemented.
if (focus)
tree_data->focus_id = focus->GetUniqueId().Get();
tree_data->focus_id = 1; // root node
return true;
AXAuraObjWrapper* AXTreeSourceAura::GetRoot() const {
return root_.get();
AXAuraObjWrapper* AXTreeSourceAura::GetFromId(int32_t id) const {
if (id == root_->GetUniqueId().Get())
return root_.get();
return AXAuraObjCache::GetInstance()->Get(id);
int32_t AXTreeSourceAura::GetId(AXAuraObjWrapper* node) const {
return node->GetUniqueId().Get();
void AXTreeSourceAura::GetChildren(
AXAuraObjWrapper* node,
std::vector<AXAuraObjWrapper*>* out_children) const {
AXAuraObjWrapper* AXTreeSourceAura::GetParent(AXAuraObjWrapper* node) const {
AXAuraObjWrapper* parent = node->GetParent();
if (!parent && node->GetUniqueId() != root_->GetUniqueId())
parent = root_.get();
return parent;
bool AXTreeSourceAura::IsValid(AXAuraObjWrapper* node) const {
return node != nullptr;
bool AXTreeSourceAura::IsEqual(AXAuraObjWrapper* node1,
AXAuraObjWrapper* node2) const {
if (!node1 || !node2)
return false;
return node1->GetUniqueId() == node2->GetUniqueId();
AXAuraObjWrapper* AXTreeSourceAura::GetNull() const {
return NULL;
void AXTreeSourceAura::SerializeNode(AXAuraObjWrapper* node,
ui::AXNodeData* out_data) const {
// Convert the global coordinates reported by each AXAuraObjWrapper
// into parent-relative coordinates to be used in the accessibility
// tree. That way when any Window, Widget, or View moves (and fires
// a location changed event), its descendants all move relative to
// it by default.
AXAuraObjWrapper* parent = node->GetParent();
if (parent) {
ui::AXNodeData parent_data;
out_data->offset_container_id = parent->GetUniqueId().Get();
if (out_data->role == ax::mojom::Role::kWebView) {
// TODO(rmrossi) : Figure out whether this will ever be required
// for chromecast.
LOG(FATAL) << "Unhandled role";
} else if (out_data->role == ax::mojom::Role::kWindow ||
out_data->role == ax::mojom::Role::kDialog) {
// Add clips children flag by default to these roles.
out_data->AddBoolAttribute(ax::mojom::BoolAttribute::kClipsChildren, true);
std::string AXTreeSourceAura::ToString(AXAuraObjWrapper* root,
std::string prefix) {
ui::AXNodeData data;
std::string output = prefix + data.ToString() + '\n';
std::vector<AXAuraObjWrapper*> children;
prefix += prefix[0];
for (size_t i = 0; i < children.size(); ++i)
output += ToString(children[i], prefix);
return output;