wip: Second crack at implementing the touch exploration mode.

ash/root_window_controller.cc

Index: ash/root_window_controller.cc
diff --git a/ash/root_window_controller.cc b/ash/root_window_controller.cc
index ba38e14a8db5b5697712a03377f0032dde2cc1ca..9b807e005476ca998e999171d0b199e13392b556 100644
--- a/ash/root_window_controller.cc
+++ b/ash/root_window_controller.cc
@@ -28,6 +28,7 @@
 #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"
@@ -75,6 +76,7 @@
 
 #if defined(OS_CHROMEOS)
 #include "ash/wm/boot_splash_screen_chromeos.h"
+#include "ui/chromeos/touch_exploration_controller.h"
 #endif
 
 namespace ash {
@@ -339,7 +341,17 @@ void RootWindowController::SetAnimatingWallpaperController(
 }
 
 void RootWindowController::Shutdown() {
-  Shell::GetInstance()->RemoveShellObserver(this);
+  Shell* shell = Shell::GetInstance();
+  shell->RemoveShellObserver(this);
+
+#if defined(OS_CHROMEOS)
+  if (!CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kAshDisableTouchExplorationMode)) {
+    if (shell->system_tray_notifier())
+      shell->system_tray_notifier()->RemoveAccessibilityObserver(this);
+    touch_exploration_controller_.reset();
+  }
+#endif
 
   if (animating_wallpaper_controller_.get())
     animating_wallpaper_controller_->StopAnimating();
@@ -351,7 +363,7 @@ void RootWindowController::Shutdown() {
   // 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());
@@ -736,6 +748,15 @@ void RootWindowController::Init(RootWindowType root_window_type,
     // Notify shell observers about new root window.
     shell->OnRootWindowAdded(root_window);
   }
+
+#if defined(OS_CHROMEOS)
+  if (!CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kAshDisableTouchExplorationMode)) {
+    Shell::GetInstance()->system_tray_notifier()->
+        AddAccessibilityObserver(this);
+    UpdateTouchExplorationState();
+  }
+#endif
 }
 
 void RootWindowController::InitLayoutManagers() {
@@ -1008,6 +1029,21 @@ void RootWindowController::CreateContainersInRootWindow(
                   "PowerButtonAnimationContainer", root_window);
 }
 
+#if defined(OS_CHROMEOS)
+void RootWindowController::UpdateTouchExplorationState() {
+  AccessibilityDelegate* delegate =
+      Shell::GetInstance()->accessibility_delegate();
+  bool enabled = delegate->IsSpokenFeedbackEnabled();
+
+  if (enabled && !touch_exploration_controller_.get()) {
+    touch_exploration_controller_.reset(
+        new ui::TouchExplorationController(GetRootWindow()));
+  } else if (!enabled && touch_exploration_controller_.get()) {
+    touch_exploration_controller_.reset();
+  }
+}
+#endif
+
 void RootWindowController::EnableTouchHudProjection() {
   if (touch_hud_projection_)
     return;
@@ -1031,6 +1067,16 @@ void RootWindowController::OnTouchHudProjectionToggled(bool enabled) {
     DisableTouchHudProjection();
 }
 
+#if defined(OS_CHROMEOS)
+void RootWindowController::OnAccessibilityModeChanged(
+      AccessibilityNotificationVisibility notify) {
+  if (!CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kAshDisableTouchExplorationMode)) {
+    UpdateTouchExplorationState();
+  }
+}
+#endif
+
 RootWindowController* GetRootWindowController(
     const aura::Window* root_window) {
   return root_window ? GetRootWindowSettings(root_window)->controller : NULL;