event_watcher.cc

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// Copyright 2013 The Flutter 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 "flutter/shell/platform/windows/event_watcher.h"
 
namespace flutter {
 
EventWatcher::EventWatcher(std::function<void()> callback)
    : callback_(callback) {
  handle_ = CreateEvent(NULL, TRUE, FALSE, NULL);
 
  RegisterWaitForSingleObject(&handle_for_wait_, handle_, &CallbackForWait,
                              reinterpret_cast<void*>(this), INFINITE,
                              WT_EXECUTEONLYONCE | WT_EXECUTEINWAITTHREAD);
}
 
EventWatcher::~EventWatcher() {
  UnregisterWait(handle_for_wait_);
  CloseHandle(handle_);
}
 
HANDLE EventWatcher::GetHandle() {
  return handle_;
}
 
// static
VOID CALLBACK EventWatcher::CallbackForWait(PVOID context, BOOLEAN) {
  EventWatcher* self = reinterpret_cast<EventWatcher*>(context);
  ResetEvent(self->handle_);
  self->callback_();
}
 
}  // namespace flutter