widget/windows/InputDeviceUtils.cpp

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim:set ts=2 sts=2 sw=2 et cin: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "InputDeviceUtils.h"
   8
   9 #define INITGUID
  10 #include <dbt.h>
  11 #include <hidclass.h>
  12 #include <ntddmou.h>
  13 #include <setupapi.h>
  14
  15 namespace mozilla {
  16 namespace widget {
  17
  18 HDEVNOTIFY
  19 InputDeviceUtils::RegisterNotification(HWND aHwnd) {
  20   DEV_BROADCAST_DEVICEINTERFACE filter = {};
  21
  22   filter.dbcc_size = sizeof(DEV_BROADCAST_DEVICEINTERFACE);
  23   filter.dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE;
  24   // Some touchsreen devices are not GUID_DEVINTERFACE_MOUSE, so here we use
  25   // GUID_DEVINTERFACE_HID instead.
  26   filter.dbcc_classguid = GUID_DEVINTERFACE_HID;
  27   return RegisterDeviceNotification(aHwnd, &filter,
  28                                     DEVICE_NOTIFY_WINDOW_HANDLE);
  29 }
  30
  31 void InputDeviceUtils::UnregisterNotification(HDEVNOTIFY aHandle) {
  32   if (!aHandle) {
  33     return;
  34   }
  35   UnregisterDeviceNotification(aHandle);
  36 }
  37
  38 DWORD
  39 InputDeviceUtils::CountMouseDevices() {
  40   HDEVINFO hdev =
  41       SetupDiGetClassDevs(&GUID_DEVINTERFACE_MOUSE, nullptr, nullptr,
  42                           DIGCF_DEVICEINTERFACE | DIGCF_PRESENT);
  43   if (hdev == INVALID_HANDLE_VALUE) {
  44     return 0;
  45   }
  46
  47   DWORD count = 0;
  48   SP_INTERFACE_DEVICE_DATA info = {};
  49   info.cbSize = sizeof(SP_INTERFACE_DEVICE_DATA);
  50   while (SetupDiEnumDeviceInterfaces(hdev, nullptr, &GUID_DEVINTERFACE_MOUSE,
  51                                      count, &info)) {
  52     if (info.Flags & SPINT_ACTIVE) {
  53       count++;
  54     }
  55   }
  56   SetupDiDestroyDeviceInfoList(hdev);
  57   return count;
  58 }
  59
  60 }  // namespace widget
  61 }  // namespace mozilla