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