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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef DEVICE_BASE_EVENT_UTILS_WINRT_H_
#define DEVICE_BASE_EVENT_UTILS_WINRT_H_
#include <windows.foundation.h>
#include <wrl/client.h>
#include <wrl/event.h>
#include <ios>
#include <optional>
#include <utility>
#include "base/functional/bind.h"
#include "base/functional/callback.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/memory/scoped_refptr.h"
#include "base/task/sequenced_task_runner.h"
#include "base/win/windows_types.h"
namespace device {
namespace internal {
template <typename Interface, typename... Args>
using IMemberFunction = HRESULT (__stdcall Interface::*)(Args...);
} // namespace internal
// Convenience template function to construct an IEventHandler from a
// RepeatingCallback of a matching signature. In case of success, the
// EventRegistrationToken is returned to the caller. A return value of
// nullopt indicates a failure. Events will be posted to the same sequence
// the event handler was created on.
template <typename Interface,
typename Args,
typename SenderAbi,
typename ArgsAbi>
std::optional<EventRegistrationToken> AddEventHandler(
Interface* interface_called,
internal::IMemberFunction<Interface,
ABI::Windows::Foundation::IEventHandler<Args*>*,
EventRegistrationToken*> function,
base::RepeatingCallback<void(SenderAbi*, ArgsAbi*)> callback) {
EventRegistrationToken token;
HRESULT hr = ((*interface_called).*function)(
Microsoft::WRL::Callback<ABI::Windows::Foundation::IEventHandler<Args*>>(
[task_runner = base::SequencedTaskRunner::GetCurrentDefault(),
callback = std::move(callback)](SenderAbi* sender, ArgsAbi* args) {
task_runner->PostTask(
FROM_HERE,
BindOnce(callback, Microsoft::WRL::ComPtr<SenderAbi>(sender),
Microsoft::WRL::ComPtr<ArgsAbi>(args)));
return S_OK;
})
.Get(),
&token);
if (FAILED(hr)) {
DVLOG(2) << "Adding EventHandler failed: "
<< "0x" << std::hex << hr;
return std::nullopt;
}
return token;
}
} // namespace device
#endif // DEVICE_BASE_EVENT_UTILS_WINRT_H_
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