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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sts=2 sw=2 et cin: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
#include "InputDeviceUtils.h"
#define INITGUID
#include <dbt.h>
#include <hidclass.h>
#include <ntddmou.h>
#include <setupapi.h>
namespace mozilla {
namespace widget {
HDEVNOTIFY
InputDeviceUtils::RegisterNotification(HWND aHwnd) {
DEV_BROADCAST_DEVICEINTERFACE filter = {};
filter.dbcc_size = sizeof(DEV_BROADCAST_DEVICEINTERFACE);
filter.dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE;
// Some touchsreen devices are not GUID_DEVINTERFACE_MOUSE, so here we use
// GUID_DEVINTERFACE_HID instead.
filter.dbcc_classguid = GUID_DEVINTERFACE_HID;
return RegisterDeviceNotification(aHwnd, &filter,
DEVICE_NOTIFY_WINDOW_HANDLE);
}
void InputDeviceUtils::UnregisterNotification(HDEVNOTIFY aHandle) {
if (!aHandle) {
return;
}
UnregisterDeviceNotification(aHandle);
}
DWORD
InputDeviceUtils::CountMouseDevices() {
HDEVINFO hdev =
SetupDiGetClassDevs(&GUID_DEVINTERFACE_MOUSE, nullptr, nullptr,
DIGCF_DEVICEINTERFACE | DIGCF_PRESENT);
if (hdev == INVALID_HANDLE_VALUE) {
return 0;
}
DWORD count = 0;
SP_INTERFACE_DEVICE_DATA info = {};
info.cbSize = sizeof(SP_INTERFACE_DEVICE_DATA);
while (SetupDiEnumDeviceInterfaces(hdev, nullptr, &GUID_DEVINTERFACE_MOUSE,
count, &info)) {
if (info.Flags & SPINT_ACTIVE) {
count++;
}
}
SetupDiDestroyDeviceInfoList(hdev);
return count;
}
} // namespace widget
} // namespace mozilla