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// Copyright 2019 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.
#include "ui/views/win/scoped_enable_unadjusted_mouse_events_win.h"
#include "ui/views/win/hwnd_message_handler.h"
namespace views {
namespace {
// From the HID Usage Tables specification.
constexpr USHORT kGenericDesktopPage = 1;
constexpr USHORT kMouseUsage = 2;
std::unique_ptr<RAWINPUTDEVICE> GetRawInputDevices(HWND hwnd, DWORD flags) {
std::unique_ptr<RAWINPUTDEVICE> device = std::make_unique<RAWINPUTDEVICE>();
device->dwFlags = flags;
device->usUsagePage = kGenericDesktopPage;
device->usUsage = kMouseUsage;
device->hwndTarget = hwnd;
return device;
}
} // namespace
ScopedEnableUnadjustedMouseEventsWin::ScopedEnableUnadjustedMouseEventsWin(
HWNDMessageHandler* owner)
: owner_(owner) {}
ScopedEnableUnadjustedMouseEventsWin::~ScopedEnableUnadjustedMouseEventsWin() {
// Stop receiving raw input.
std::unique_ptr<RAWINPUTDEVICE> device(
GetRawInputDevices(nullptr, RIDEV_REMOVE));
if (!RegisterRawInputDevices(device.get(), 1, sizeof(*device)))
PLOG(INFO) << "RegisterRawInputDevices() failed for RIDEV_REMOVE ";
DCHECK(owner_->using_wm_input());
owner_->set_using_wm_input(false);
}
// static
std::unique_ptr<ScopedEnableUnadjustedMouseEventsWin>
ScopedEnableUnadjustedMouseEventsWin::StartMonitor(HWNDMessageHandler* owner) {
std::unique_ptr<RAWINPUTDEVICE> device(
GetRawInputDevices(owner->hwnd(), RIDEV_INPUTSINK));
if (!RegisterRawInputDevices(device.get(), 1, sizeof(*device))) {
PLOG(INFO) << "RegisterRawInputDevices() failed for RIDEV_INPUTSINK ";
return nullptr;
}
DCHECK(!owner->using_wm_input());
owner->set_using_wm_input(true);
return std::make_unique<ScopedEnableUnadjustedMouseEventsWin>(owner);
}
} // namespace views
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