Automatic deployment of the virtual keyboard.

ash/virtual_keyboard_controller.h

 // 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.
 
 #ifndef ASH_VIRTUAL_KEYBOARD_CONTROLLER_H_
 #define ASH_VIRTUAL_KEYBOARD_CONTROLLER_H_
 
 #include "ash/ash_export.h"
 #include "ash/shell_observer.h"
+#include "ui/events/input_device_event_observer.h"
 
 namespace ash {
 
-// This class observes enter/leaving maximized mode for virtual keyboard.
-class ASH_EXPORT VirtualKeyboardController : public ShellObserver {
+// This class observes input device changes for the virtual keyboard.
+class ASH_EXPORT VirtualKeyboardController
+    : public ShellObserver,
+      public ui::InputDeviceEventObserver {
  public:
   VirtualKeyboardController();
   ~VirtualKeyboardController() override;
 
   // ShellObserver:
-  void OnMaximizeModeStarted() override;
-  void OnMaximizeModeEnded() override;
+  virtual void OnMaximizeModeStarted() override;
+  virtual void OnMaximizeModeEnded() override;
+
+  // ui::InputDeviceObserver:
+  // TODO(rsadam@): Remove when autovirtual keyboard flag is on by default.
+  virtual void OnTouchscreenDeviceConfigurationChanged() override;
+  virtual void OnKeyboardDeviceConfigurationChanged() override;
 
  private:
+  // Updates the list of active input devices.
+  void UpdateDevices();
+
+  // Updates the keyboard state.
+  void UpdateKeyboardEnabled();
+
+  // Creates the keyboard if |enabled|, else destroys it.
+  void SetKeyboardEnabled(bool enabled);
+
+  // True if an external keyboard is connected.
+  bool has_external_keyboard_;
+  // True if an internal keyboard is connected.
+  bool has_internal_keyboard_;
+  // True if a touchscreen is connected.
+  bool has_touchscreen_;
+
   DISALLOW_COPY_AND_ASSIGN(VirtualKeyboardController);
 };
 
 }  // namespace ash
 
 #endif  // ASH_VIRTUAL_KEYBOARD_CONTROLLER_H_