blob: 8bf857f98867069eee31b69fa3a7740ac903e8a5 [file] [log] [blame]
// Copyright 2020 The Fuchsia 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 <lib/fit/function.h>
#include <lib/zx/channel.h>
namespace ui_input {
// This interface wraps a facility that can produce the zx::channels that represent
// the input-devices that are registered.
class DeviceWatcher {
// Callback function which is invoked whenever a device is found, producing
// a zx::channel to connect to the device.
using ExistsCallback = fit::function<void(zx::channel)>;
virtual ~DeviceWatcher() = default;
// Begins watching for devices. This method may be called at most once.
virtual void Watch(ExistsCallback callback) = 0;
} // namespace ui_input