Refactored gamepad polling to support dynamic sources

device/gamepad/gamepad_platform_data_fetcher_win.h

 // 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.
 
 #ifndef DEVICE_GAMEPAD_GAMEPAD_PLATFORM_DATA_FETCHER_WIN_H_
 #define DEVICE_GAMEPAD_GAMEPAD_PLATFORM_DATA_FETCHER_WIN_H_
 
 #include <memory>
 
 #include "build/build_config.h"
 
 #ifndef WIN32_LEAN_AND_MEAN
 #define WIN32_LEAN_AND_MEAN
 #endif
 #include <Unknwn.h>
 #include <WinDef.h>
 #include <XInput.h>
 #include <stdlib.h>
 #include <windows.h>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/scoped_native_library.h"
 #include "device/gamepad/gamepad_data_fetcher.h"
 #include "device/gamepad/gamepad_standard_mappings.h"
-#include "device/gamepad/raw_input_data_fetcher_win.h"
 #include "third_party/WebKit/public/platform/WebGamepads.h"
 
 namespace device {
 
 class GamepadPlatformDataFetcherWin : public GamepadDataFetcher {
  public:
+  typedef GamepadDataFetcherFactoryImpl<GamepadPlatformDataFetcherWin,
+                                        GAMEPAD_SOURCE_WIN_XINPUT>
+      Factory;
+
   GamepadPlatformDataFetcherWin();
   ~GamepadPlatformDataFetcherWin() override;
-  void GetGamepadData(blink::WebGamepads* pads,
-                      bool devices_changed_hint) override;
-  void PauseHint(bool paused) override;
+
+  GamepadSource source() override;
+
+  void GetGamepadData(bool devices_changed_hint) override;
 
  private:
-  // XInput-specific implementation for GetGamepadData.
-  bool GetXInputGamepadData(blink::WebGamepads* pads,
-                            bool devices_changed_hint);
+  void OnAddedToProvider() override;
 
   // The three function types we use from xinput1_3.dll.
   typedef void(WINAPI* XInputEnableFunc)(BOOL enable);
   typedef DWORD(WINAPI* XInputGetCapabilitiesFunc)(
       DWORD dwUserIndex,
       DWORD dwFlags,
       XINPUT_CAPABILITIES* pCapabilities);
   typedef DWORD(WINAPI* XInputGetStateFunc)(DWORD dwUserIndex,
                                             XINPUT_STATE* pState);
 
   // Get functions from dynamically loading the xinput dll.
   // Returns true if loading was successful.
   bool GetXInputDllFunctions();
 
   // Scan for connected XInput and DirectInput gamepads.
   void EnumerateDevices();
-  bool GetXInputPadConnectivity(int i, blink::WebGamepad* pad) const;
-
-  void GetXInputPadData(int i, blink::WebGamepad* pad);
-  void GetRawInputPadData(int i, blink::WebGamepad* pad);
-
-  int FirstAvailableGamepadId() const;
-  bool HasXInputGamepad(int index) const;
-  bool HasRawInputGamepad(const HANDLE handle) const;
+  void GetXInputPadData(int i);
 
   base::ScopedNativeLibrary xinput_dll_;
   bool xinput_available_;
 
   // Function pointers to XInput functionality, retrieved in
   // |GetXinputDllFunctions|.
   XInputGetCapabilitiesFunc xinput_get_capabilities_;
   XInputGetStateFunc xinput_get_state_;
 
-  enum PadConnectionStatus {
-    DISCONNECTED,
-    XINPUT_CONNECTED,
-    RAWINPUT_CONNECTED
-  };
-
-  struct PlatformPadState {
-    PadConnectionStatus status;
-
-    int xinput_index;         // XInput-only
-    HANDLE raw_input_handle;  // RawInput-only fields.
-  };
-  PlatformPadState platform_pad_state_[blink::WebGamepads::itemsLengthCap];
-
-  std::unique_ptr<RawInputDataFetcher> raw_input_fetcher_;
+  bool xinuput_connected_[XUSER_MAX_COUNT];
 
   DISALLOW_COPY_AND_ASSIGN(GamepadPlatformDataFetcherWin);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_GAMEPAD_GAMEPAD_PLATFORM_DATA_FETCHER_WIN_H_