[Media Router] Custom Controls 1 - Add MediaStatus, MediaRouteController, and mojo interfaces

chrome/browser/media/router/mojo/media_route_controller.cc

+// Copyright 2017 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 "chrome/browser/media/router/mojo/media_route_controller.h"
+
+#include <utility>
+
+namespace media_router {
+
+MediaRouteController::Observer::Observer(
+    scoped_refptr<MediaRouteController> controller)
+    : controller_(std::move(controller)) {
+  controller_->AddObserver(this);
+}
+
+MediaRouteController::Observer::~Observer() {
+  if (controller_)
+    controller_->RemoveObserver(this);
+}
+
+void MediaRouteController::Observer::InvalidateController() {
+  controller_->RemoveObserver(this);
+  controller_ = nullptr;
+  OnControllerInvalidated();
+}
+
+void MediaRouteController::Observer::OnControllerInvalidated() {}
+
+MediaRouteController::MediaRouteController(
+    const MediaRoute::Id& route_id,
+    mojom::MediaControllerPtr media_controller)
+    : route_id_(route_id), media_controller_(std::move(media_controller)) {
+  DCHECK(media_controller_.is_bound());
+  media_controller_.set_connection_error_handler(
+      base::Bind(&MediaRouteController::Invalidate, base::Unretained(this)));
+}
+
+void MediaRouteController::Play() {
+  media_controller_->Play();
+}
+
+void MediaRouteController::Pause() {
+  media_controller_->Pause();
+}
+
+void MediaRouteController::Seek(base::TimeDelta time) {
+  media_controller_->Seek(time);
+}
+
+void MediaRouteController::SetMute(bool mute) {
+  media_controller_->SetMute(mute);
+}
+
+void MediaRouteController::SetVolume(float volume) {
+  media_controller_->SetVolume(volume);
+}
+
+void MediaRouteController::OnMediaStatusUpdated(const MediaStatus& status) {
+  for (Observer& observer : observers_)
+    observer.OnMediaStatusUpdated(status);
+}
+
+void MediaRouteController::Invalidate() {
+  for (Observer& observer : observers_)
+    observer.InvalidateController();
+  // |this| is deleted here!
+}
+
+MediaRouteController::~MediaRouteController() {}
+
+void MediaRouteController::AddObserver(Observer* observer) {
+  observers_.AddObserver(observer);
+}
+
+void MediaRouteController::RemoveObserver(Observer* observer) {
+  observers_.RemoveObserver(observer);
+}
+
+}  // namespace media_router