sdk/lib/ui/scenic/cpp/testing/fake_mouse_source.h

// Copyright 2022 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.

#ifndef LIB_UI_SCENIC_CPP_TESTING_FAKE_MOUSE_SOURCE_H_
#define LIB_UI_SCENIC_CPP_TESTING_FAKE_MOUSE_SOURCE_H_

#include <fuchsia/ui/pointer/cpp/fidl.h>
#include <zircon/assert.h>

namespace scenic {

// A test stub to act as the protocol server. A test can control what is sent
// back by this server implementation, via the ScheduleCallback call.
class FakeMouseSource : public fuchsia::ui::pointer::MouseSource {
 public:
  // |fuchsia.ui.pointer.MouseSource|
  void Watch(MouseSource::WatchCallback callback) override { callback_ = std::move(callback); }

  // Have the server issue events to the client's hanging-get Watch call.
  void ScheduleCallback(std::vector<fuchsia::ui::pointer::MouseEvent> events) {
    ZX_ASSERT_MSG(callback_, "FakeMouseSource::ScheduleCallback require a valid WatchCallback");
    callback_(std::move(events));
  }

 private:
  // Client-side logic to invoke on Watch() call's return. A test triggers it
  // with ScheduleCallback().
  MouseSource::WatchCallback callback_;
};

}  // namespace scenic

#endif  // LIB_UI_SCENIC_CPP_TESTING_FAKE_MOUSE_SOURCE_H_