Mojo-ify implementation of screen orientation locking/unlocking.

content/browser/screen_orientation/screen_orientation_service_impl.cc

+// Copyright 2016 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 "content/browser/screen_orientation/screen_orientation_service_impl.h"
+
+#include "base/bind.h"
+#include "content/public/browser/screen_orientation_provider.h"
+
+namespace content {
+
+using typename mojom::ScreenOrientationLockResult;
+
+// static
+void ScreenOrientationServiceImpl::Create(
+    ScreenOrientationProvider* provider,
+    mojom::ScreenOrientationServiceRequest request) {
+  new ScreenOrientationServiceImpl(provider, std::move(request));
+}
+
+ScreenOrientationServiceImpl::ScreenOrientationServiceImpl(
+    ScreenOrientationProvider* provider,
+    mojom::ScreenOrientationServiceRequest request)
+    : provider_(provider),
+      binding_(this, std::move(request)),
+      weak_factory_(this) {}
+
+ScreenOrientationServiceImpl::~ScreenOrientationServiceImpl() = default;
+
+void ScreenOrientationServiceImpl::LockOrientation(
+    blink::WebScreenOrientationLockType orientation,
+    const LockOrientationCallback& callback) {
+  DCHECK(on_result_callback_.is_null());
+  on_result_callback_ = callback;
+
+  if (!provider_) {
+    NotifyLockResult(ScreenOrientationLockResult::
+                         SCREEN_ORIENTATION_LOCK_RESULT_ERROR_NOT_AVAILABLE);
+    return;
+  }
+
+  provider_->LockOrientation(
+      orientation, base::Bind(&ScreenOrientationServiceImpl::NotifyLockResult,
+                              weak_factory_.GetWeakPtr()));
+}
+
+void ScreenOrientationServiceImpl::UnlockOrientation() {
+  // Cancel any pending lock request.
+  NotifyLockResult(ScreenOrientationLockResult::
+                       SCREEN_ORIENTATION_LOCK_RESULT_ERROR_CANCELED);
+
+  if (provider_)
+    provider_->UnlockOrientation();
+}
+
+void ScreenOrientationServiceImpl::NotifyLockResult(
+    ScreenOrientationLockResult result) {
+  if (on_result_callback_.is_null())
+    return;
+
+  on_result_callback_.Run(result);
+
+  // Reset the callback.
+  on_result_callback_ = LockOrientationCallback();
+}
+
+}  // namespace content