Implementation of the Touch Exploration Mode - Part II (ash)

ash/root_window_controller.cc

 // Copyright (c) 2012 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 "ash/root_window_controller.h"
 
 #include <queue>
 #include <vector>
 
 #include "ash/ash_constants.h"
@@ skipping 10 matching lines @@
 #include "ash/shelf/shelf_layout_manager.h"
 #include "ash/shelf/shelf_types.h"
 #include "ash/shelf/shelf_widget.h"
 #include "ash/shell.h"
 #include "ash/shell_delegate.h"
 #include "ash/shell_factory.h"
 #include "ash/shell_window_ids.h"
 #include "ash/switchable_windows.h"
 #include "ash/system/status_area_widget.h"
 #include "ash/system/tray/system_tray_delegate.h"
+#include "ash/system/tray/system_tray_notifier.h"
 #include "ash/touch/touch_hud_debug.h"
 #include "ash/touch/touch_hud_projection.h"
 #include "ash/touch/touch_observer_hud.h"
 #include "ash/wm/always_on_top_controller.h"
 #include "ash/wm/dock/docked_window_layout_manager.h"
 #include "ash/wm/panels/attached_panel_window_targeter.h"
 #include "ash/wm/panels/panel_layout_manager.h"
 #include "ash/wm/panels/panel_window_event_handler.h"
 #include "ash/wm/root_window_layout_manager.h"
 #include "ash/wm/screen_dimmer.h"
@@ skipping 26 matching lines @@
 #include "ui/views/view_model_utils.h"
 #include "ui/wm/core/capture_controller.h"
 #include "ui/wm/core/easy_resize_window_targeter.h"
 #include "ui/wm/core/visibility_controller.h"
 #include "ui/wm/core/window_util.h"
 #include "ui/wm/public/drag_drop_client.h"
 #include "ui/wm/public/tooltip_client.h"
 #include "ui/wm/public/window_types.h"
 
 #if defined(OS_CHROMEOS)
+#include "ash/system/tray_accessibility.h"
 #include "ash/wm/boot_splash_screen_chromeos.h"
+#include "ui/chromeos/touch_exploration_controller.h"
 #endif
 
 namespace ash {
 namespace {
 
 #if defined(OS_CHROMEOS)
 // Duration for the animation that hides the boot splash screen, in
 // milliseconds.  This should be short enough in relation to
 // wm/window_animation.cc's brightness/grayscale fade animation that the login
 // background image animation isn't hidden by the splash screen animation.
@@ skipping 162 matching lines @@
   }
   virtual bool HasHitTestMask() const OVERRIDE {
     return false;
   }
   virtual void GetHitTestMask(gfx::Path* mask) const OVERRIDE {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(EmptyWindowDelegate);
 };
 
+#if defined(OS_CHROMEOS)
+// Responsible for initializing TouchExplorationController when spoken
+// feedback is on.
+class CrosAccessibilityObserver : public AccessibilityObserver {
+ public:
+  explicit CrosAccessibilityObserver(
+      RootWindowController* root_window_controller)
+      : root_window_controller_(root_window_controller) {
+    Shell::GetInstance()->system_tray_notifier()->
+        AddAccessibilityObserver(this);
+    UpdateTouchExplorationState();
+  }
+
+  virtual ~CrosAccessibilityObserver() {
+    SystemTrayNotifier* system_tray_notifier =
+        Shell::GetInstance()->system_tray_notifier();
+    if (system_tray_notifier)
+      system_tray_notifier->RemoveAccessibilityObserver(this);
+  }
+
+ private:
+  void UpdateTouchExplorationState() {
+    AccessibilityDelegate* delegate =
+        Shell::GetInstance()->accessibility_delegate();
+    bool enabled = delegate->IsSpokenFeedbackEnabled();
+
+    if (enabled && !touch_exploration_controller_.get()) {
+      touch_exploration_controller_.reset(
+          new ui::TouchExplorationController(
+              root_window_controller_->GetRootWindow()));
+    } else if (!enabled) {
+      touch_exploration_controller_.reset();
+    }
+  }
+
+  // Overridden from AccessibilityObserver.
+  virtual void OnAccessibilityModeChanged(
+      AccessibilityNotificationVisibility notify) OVERRIDE {
+    UpdateTouchExplorationState();
+  }
+
+  scoped_ptr<ui::TouchExplorationController> touch_exploration_controller_;
+  RootWindowController* root_window_controller_;
+
+  DISALLOW_COPY_AND_ASSIGN(CrosAccessibilityObserver);
+};
+#endif // OS_CHROMEOS
+
 }  // namespace
 
 void RootWindowController::CreateForPrimaryDisplay(AshWindowTreeHost* host) {
   RootWindowController* controller = new RootWindowController(host);
   controller->Init(RootWindowController::PRIMARY,
                    Shell::GetInstance()->delegate()->IsFirstRunAfterBoot());
 }
 
 void RootWindowController::CreateForSecondaryDisplay(AshWindowTreeHost* host) {
   RootWindowController* controller = new RootWindowController(host);
@@ skipping 62 matching lines @@
 }
 
 void RootWindowController::SetAnimatingWallpaperController(
     AnimatingDesktopController* controller) {
   if (animating_wallpaper_controller_.get())
     animating_wallpaper_controller_->StopAnimating();
   animating_wallpaper_controller_.reset(controller);
 }
 
 void RootWindowController::Shutdown() {
-  Shell::GetInstance()->RemoveShellObserver(this);
+  Shell* shell = Shell::GetInstance();
+  shell->RemoveShellObserver(this);
+
+#if defined(OS_CHROMEOS)
+  if (cros_accessibility_observer_) {
+    cros_accessibility_observer_.reset();
+  }
+#endif
 
   if (animating_wallpaper_controller_.get())
     animating_wallpaper_controller_->StopAnimating();
   wallpaper_controller_.reset();
   animating_wallpaper_controller_.reset();
   aura::Window* root_window = GetRootWindow();
   // Change the target root window before closing child windows. If any child
   // being removed triggers a relayout of the shelf it will try to build a
   // window list adding windows from the target root window's containers which
   // may have already gone away.
   if (Shell::GetTargetRootWindow() == root_window) {
-    Shell::GetInstance()->set_target_root_window(
+    shell->set_target_root_window(
         Shell::GetPrimaryRootWindow() == root_window
             ? NULL
             : Shell::GetPrimaryRootWindow());
   }
 
   CloseChildWindows();
   GetRootWindowSettings(root_window)->controller = NULL;
   screen_dimmer_.reset();
   workspace_controller_.reset();
   // Forget with the display ID so that display lookup
@@ skipping 364 matching lines @@
     root_window_layout()->OnWindowResized();
     ash_host_->AsWindowTreeHost()->Show();
 
     // Create a shelf if a user is already logged in.
     if (shell->session_state_delegate()->NumberOfLoggedInUsers())
       shelf()->CreateShelf();
 
     // Notify shell observers about new root window.
     shell->OnRootWindowAdded(root_window);
   }
+
+#if defined(OS_CHROMEOS)
+  if (CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kAshEnableTouchExplorationMode)) {
+    cros_accessibility_observer_.reset(new CrosAccessibilityObserver(this));
+  }
+#endif
 }
 
 void RootWindowController::InitLayoutManagers() {
   aura::Window* root_window = GetRootWindow();
   root_window_layout_ = new RootWindowLayoutManager(root_window);
   root_window->SetLayoutManager(root_window_layout_);
 
   aura::Window* default_container =
       GetContainer(kShellWindowId_DefaultContainer);
   // Workspace manager has its own layout managers.
@@ skipping 281 matching lines @@
   else
     DisableTouchHudProjection();
 }
 
 RootWindowController* GetRootWindowController(
     const aura::Window* root_window) {
   return root_window ? GetRootWindowSettings(root_window)->controller : NULL;
 }
 
 }  // namespace ash