Re-land (2): Reimplement automation API on top of C++-backed AXTree.

chrome/browser/extensions/api/automation_internal/automation_util.cc

-// 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 "chrome/browser/extensions/api/automation_internal/automation_util.h"
-
-#include <string>
-#include <utility>
-
-#include "base/values.h"
-#include "chrome/browser/accessibility/ax_tree_id_registry.h"
-#include "chrome/common/extensions/api/automation_internal.h"
-#include "content/public/browser/browser_context.h"
-#include "content/public/browser/browser_plugin_guest_manager.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 "extensions/browser/event_router.h"
-#include "ui/accessibility/ax_enums.h"
-#include "ui/accessibility/ax_node_data.h"
-
-namespace extensions {
-
-namespace {
-
-void PopulateNodeData(const ui::AXNodeData& node_data,
-    linked_ptr< api::automation_internal::AXNodeData>& out_node_data) {
-  out_node_data->id = node_data.id;
-  out_node_data->role = ToString(node_data.role);
-
-  uint32 state_pos = 0, state_shifter = node_data.state;
-  while (state_shifter) {
-    if (state_shifter & 1) {
-      out_node_data->state.additional_properties.SetBoolean(
-          ToString(static_cast<ui::AXState>(state_pos)), true);
-    }
-    state_shifter = state_shifter >> 1;
-    state_pos++;
-  }
-
-  out_node_data->location.left = node_data.location.x();
-  out_node_data->location.top = node_data.location.y();
-  out_node_data->location.width = node_data.location.width();
-  out_node_data->location.height = node_data.location.height();
-
-  if (!node_data.bool_attributes.empty()) {
-    out_node_data->bool_attributes.reset(
-        new api::automation_internal::AXNodeData::BoolAttributes());
-    for (size_t i = 0; i < node_data.bool_attributes.size(); ++i) {
-      std::pair<ui::AXBoolAttribute, bool> attr =
-          node_data.bool_attributes[i];
-      out_node_data->bool_attributes->additional_properties.SetBoolean(
-          ToString(attr.first), attr.second);
-    }
-  }
-
-  if (!node_data.float_attributes.empty()) {
-    out_node_data->float_attributes.reset(
-        new api::automation_internal::AXNodeData::FloatAttributes());
-    for (size_t i = 0; i < node_data.float_attributes.size(); ++i) {
-      std::pair<ui::AXFloatAttribute, float> attr =
-          node_data.float_attributes[i];
-      out_node_data->float_attributes->additional_properties.SetDouble(
-          ToString(attr.first), attr.second);
-    }
-  }
-
-  if (!node_data.html_attributes.empty()) {
-    out_node_data->html_attributes.reset(
-        new api::automation_internal::AXNodeData::HtmlAttributes());
-    for (size_t i = 0; i < node_data.html_attributes.size(); ++i) {
-      std::pair<std::string, std::string> attr = node_data.html_attributes[i];
-      out_node_data->html_attributes->additional_properties.SetString(
-          attr.first, attr.second);
-    }
-  }
-
-  if (!node_data.int_attributes.empty()) {
-    out_node_data->int_attributes.reset(
-        new api::automation_internal::AXNodeData::IntAttributes());
-    for (size_t i = 0; i < node_data.int_attributes.size(); ++i) {
-      std::pair<ui::AXIntAttribute, int> attr = node_data.int_attributes[i];
-      out_node_data->int_attributes->additional_properties.SetInteger(
-          ToString(attr.first), attr.second);
-    }
-  }
-
-  if (!node_data.intlist_attributes.empty()) {
-    out_node_data->intlist_attributes.reset(
-        new api::automation_internal::AXNodeData::IntlistAttributes());
-    for (size_t i = 0; i < node_data.intlist_attributes.size(); ++i) {
-      std::pair<ui::AXIntListAttribute, std::vector<int32> > attr =
-          node_data.intlist_attributes[i];
-      base::ListValue* intlist = new base::ListValue();
-      for (size_t j = 0; j < attr.second.size(); ++j)
-        intlist->AppendInteger(attr.second[j]);
-      out_node_data->intlist_attributes->additional_properties.Set(
-          ToString(attr.first), intlist);
-    }
-  }
-
-  if (!node_data.string_attributes.empty()) {
-    out_node_data->string_attributes.reset(
-        new api::automation_internal::AXNodeData::StringAttributes());
-    for (size_t i = 0; i < node_data.string_attributes.size(); ++i) {
-      std::pair<ui::AXStringAttribute, std::string> attr =
-          node_data.string_attributes[i];
-      out_node_data->string_attributes->additional_properties.SetString(
-          ToString(attr.first), attr.second);
-    }
-  }
-
-  for (size_t i = 0; i < node_data.child_ids.size(); ++i) {
-    out_node_data->child_ids.push_back(node_data.child_ids[i]);
-  }
-}
-
-void DispatchEventInternal(content::BrowserContext* context,
-                           events::HistogramValue histogram_value,
-                           const std::string& event_name,
-                           scoped_ptr<base::ListValue> args) {
-  if (context && EventRouter::Get(context)) {
-    scoped_ptr<Event> event(
-        new Event(histogram_value, event_name, args.Pass()));
-    event->restrict_to_browser_context = context;
-    EventRouter::Get(context)->BroadcastEvent(event.Pass());
-  }
-}
-
-}  // namespace
-
-namespace automation_util {
-
-void DispatchAccessibilityEventsToAutomation(
-    const std::vector<content::AXEventNotificationDetails>& details,
-    content::BrowserContext* browser_context,
-    const gfx::Vector2d& location_offset) {
-  using api::automation_internal::AXEventParams;
-  using api::automation_internal::AXTreeUpdate;
-
-  std::vector<content::AXEventNotificationDetails>::const_iterator iter =
-      details.begin();
-  for (; iter != details.end(); ++iter) {
-    const content::AXEventNotificationDetails& event = *iter;
-
-    AXEventParams ax_event_params;
-    ax_event_params.tree_id =
-        AXTreeIDRegistry::GetInstance()->GetOrCreateAXTreeID(event.process_id,
-                                                             event.routing_id);
-    ax_event_params.event_type = ToString(iter->event_type);
-    ax_event_params.target_id = event.id;
-
-    AXTreeUpdate& ax_tree_update = ax_event_params.update;
-    ax_tree_update.node_id_to_clear = event.node_id_to_clear;
-    for (size_t i = 0; i < event.nodes.size(); ++i) {
-      ui::AXNodeData src = event.nodes[i];
-      src.location.Offset(location_offset);
-      linked_ptr<api::automation_internal::AXNodeData> out_node(
-          new api::automation_internal::AXNodeData());
-      PopulateNodeData(src, out_node);
-      if (src.HasBoolAttribute(ui::AX_ATTR_IS_AX_TREE_HOST)) {
-        const auto& iter = event.node_to_browser_plugin_instance_id_map.find(
-            src.id);
-        if (iter != event.node_to_browser_plugin_instance_id_map.end()) {
-          int instance_id = iter->second;
-          content::BrowserPluginGuestManager* guest_manager =
-              browser_context->GetGuestManager();
-          content::WebContents* guest_web_contents =
-              guest_manager->GetGuestByInstanceID(event.process_id,
-                                                  instance_id);
-          if (guest_web_contents) {
-            content::RenderFrameHost* guest_rfh =
-                guest_web_contents->GetMainFrame();
-            int guest_tree_id =
-                AXTreeIDRegistry::GetInstance()->GetOrCreateAXTreeID(
-                    guest_rfh->GetProcess()->GetID(),
-                    guest_rfh->GetRoutingID());
-            out_node->int_attributes->additional_properties.SetInteger(
-                ToString(ui::AX_ATTR_CHILD_TREE_ID),
-                guest_tree_id);
-          }
-        }
-      }
-      ax_tree_update.nodes.push_back(out_node);
-    }
-
-    // TODO(dtseng/aboxhall): Why are we sending only one update at a time? We
-    // should match the behavior from renderer -> browser and send a
-    // collection of tree updates over (to the extension); see
-    // |AccessibilityHostMsg_EventParams| and |AccessibilityHostMsg_Events|.
-    DispatchEventInternal(
-        browser_context, events::AUTOMATION_INTERNAL_ON_ACCESSIBILITY_EVENT,
-        api::automation_internal::OnAccessibilityEvent::kEventName,
-        api::automation_internal::OnAccessibilityEvent::Create(
-            ax_event_params));
-  }
-}
-
-void DispatchTreeDestroyedEventToAutomation(
-    int process_id,
-    int routing_id,
-    content::BrowserContext* browser_context) {
-  int tree_id = AXTreeIDRegistry::GetInstance()->GetOrCreateAXTreeID(
-      process_id, routing_id);
-  DispatchEventInternal(
-      browser_context,
-      events::AUTOMATION_INTERNAL_ON_ACCESSIBILITY_TREE_DESTROYED,
-      api::automation_internal::OnAccessibilityTreeDestroyed::kEventName,
-      api::automation_internal::OnAccessibilityTreeDestroyed::Create(tree_id));
-  AXTreeIDRegistry::GetInstance()->RemoveAXTreeID(tree_id);
-}
-
-}  // namespace automation_util
-
-}  // namespace extensions