chrome/browser/ui/aura/accessibility/automation_manager_aura.cc

   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 "chrome/browser/ui/aura/accessibility/automation_manager_aura.h"
   6
   7 #include <vector>
   8
   9 #include "base/memory/singleton.h"
  10 #include "chrome/browser/browser_process.h"
  11 #include "chrome/browser/extensions/api/automation_internal/automation_util.h"
  12 #include "chrome/browser/profiles/profile_manager.h"
  13 #include "content/public/browser/ax_event_notification_details.h"
  14 #include "content/public/browser/browser_context.h"
  15 #include "ui/aura/window.h"
  16 #include "ui/views/accessibility/ax_aura_obj_cache.h"
  17 #include "ui/views/accessibility/ax_aura_obj_wrapper.h"
  18 #include "ui/views/view.h"
  19 #include "ui/views/widget/widget.h"
  20
  21 using content::BrowserContext;
  22
  23 // static
  24 AutomationManagerAura* AutomationManagerAura::GetInstance() {
  25   return Singleton<AutomationManagerAura>::get();
  26 }
  27
  28 void AutomationManagerAura::Enable(BrowserContext* context) {
  29   enabled_ = true;
  30   if (!current_tree_.get())
  31     current_tree_.reset(new AXTreeSourceAura());
  32   ResetSerializer();
  33
  34   SendEvent(context, current_tree_->GetRoot(), ui::AX_EVENT_LOAD_COMPLETE);
  35   if (focused_window_) {
  36     views::AXAuraObjWrapper* focus =
  37         views::AXAuraObjCache::GetInstance()->GetOrCreate(focused_window_);
  38     SendEvent(context, focus, ui::AX_EVENT_CHILDREN_CHANGED);
  39   }
  40 }
  41
  42 void AutomationManagerAura::Disable() {
  43   enabled_ = false;
  44
  45   // Reset the serializer to save memory.
  46   current_tree_serializer_->Reset();
  47 }
  48
  49 void AutomationManagerAura::HandleEvent(BrowserContext* context,
  50                                         views::View* view,
  51                                         ui::AXEvent event_type) {
  52   if (view->GetWidget())
  53     focused_window_ = view->GetWidget()->GetNativeView();
  54   if (!enabled_)
  55     return;
  56
  57   if (!context && g_browser_process->profile_manager())
  58     context = g_browser_process->profile_manager()->GetLastUsedProfile();
  59
  60   if (!context) {
  61     LOG(WARNING) << "Accessibility notification but no browser context";
  62     return;
  63   }
  64
  65   views::AXAuraObjWrapper* aura_obj =
  66       views::AXAuraObjCache::GetInstance()->GetOrCreate(view);
  67
  68   if (processing_events_) {
  69     pending_events_.push_back(std::make_pair(aura_obj, event_type));
  70     return;
  71   }
  72
  73   processing_events_ = true;
  74   SendEvent(context, aura_obj, event_type);
  75
  76   for (size_t i = 0; i < pending_events_.size(); ++i)
  77     SendEvent(context, pending_events_[i].first, pending_events_[i].second);
  78
  79   processing_events_ = false;
  80   pending_events_.clear();
  81 }
  82
  83 void AutomationManagerAura::HandleAlert(content::BrowserContext* context,
  84                                         const std::string& text) {
  85   if (!enabled_)
  86     return;
  87
  88   views::AXAuraObjWrapper* obj =
  89       static_cast<AXRootObjWrapper*>(current_tree_->GetRoot())
  90           ->GetAlertForText(text);
  91   SendEvent(context, obj, ui::AX_EVENT_ALERT);
  92 }
  93
  94 void AutomationManagerAura::DoDefault(int32 id) {
  95   CHECK(enabled_);
  96   current_tree_->DoDefault(id);
  97 }
  98
  99 void AutomationManagerAura::Focus(int32 id) {
 100   CHECK(enabled_);
 101   current_tree_->Focus(id);
 102 }
 103
 104 void AutomationManagerAura::MakeVisible(int32 id) {
 105   CHECK(enabled_);
 106   current_tree_->MakeVisible(id);
 107 }
 108
 109 void AutomationManagerAura::SetSelection(int32 id, int32 start, int32 end) {
 110   CHECK(enabled_);
 111   current_tree_->SetSelection(id, start, end);
 112 }
 113
 114 void AutomationManagerAura::ShowContextMenu(int32 id) {
 115   CHECK(enabled_);
 116   current_tree_->ShowContextMenu(id);
 117 }
 118
 119 AutomationManagerAura::AutomationManagerAura()
 120     : enabled_(false), processing_events_(false), focused_window_(nullptr) {
 121   views::WidgetFocusManager::GetInstance()->AddFocusChangeListener(this);
 122 }
 123
 124 AutomationManagerAura::~AutomationManagerAura() {
 125 }
 126
 127 void AutomationManagerAura::ResetSerializer() {
 128   current_tree_serializer_.reset(
 129       new ui::AXTreeSerializer<views::AXAuraObjWrapper*>(current_tree_.get()));
 130 }
 131
 132 void AutomationManagerAura::SendEvent(BrowserContext* context,
 133                                       views::AXAuraObjWrapper* aura_obj,
 134                                       ui::AXEvent event_type) {
 135   ui::AXTreeUpdate update;
 136   current_tree_serializer_->SerializeChanges(aura_obj, &update);
 137
 138   // Route this event to special process/routing ids recognized by the
 139   // Automation API as the desktop tree.
 140   // TODO(dtseng): Would idealy define these special desktop constants in idl.
 141   content::AXEventNotificationDetails detail(
 142       update.node_id_to_clear, update.nodes, event_type, aura_obj->GetID(),
 143       0, /* process_id */
 144       0 /* routing_id */);
 145   std::vector<content::AXEventNotificationDetails> details;
 146   details.push_back(detail);
 147   extensions::automation_util::DispatchAccessibilityEventsToAutomation(
 148       details, context, gfx::Vector2d());
 149 }
 150
 151 void AutomationManagerAura::OnNativeFocusChanged(aura::Window* focused_now) {
 152   focused_window_ = focused_now;
 153 }