Chromium plumbing for Device Orientation.

chrome/renderer/device_orientation_dispatcher.cc

+// Copyright (c) 2010 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/renderer/device_orientation_dispatcher.h"
+
+#include "chrome/renderer/render_view.h"
+#include "third_party/WebKit/WebKit/chromium/public/WebDeviceOrientation.h"
+#include "third_party/WebKit/WebKit/chromium/public/WebDeviceOrientationController.h"
+
+DeviceOrientationDispatcher::DeviceOrientationDispatcher(
+    RenderView* render_view)
+    : render_view_(render_view),
+      controller_(NULL),
+      started_(false) {
+}
+
+DeviceOrientationDispatcher::~DeviceOrientationDispatcher() {
+  if (started_)
+    stopUpdating();
+}
+
+bool DeviceOrientationDispatcher::OnMessageReceived(const IPC::Message& msg) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP(DeviceOrientationDispatcher, msg)
+    IPC_MESSAGE_HANDLER(ViewMsg_DeviceOrientationUpdated,
+                        OnDeviceOrientationUpdated)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+  return handled;
+}
+
+void DeviceOrientationDispatcher::setController(
+    WebKit::WebDeviceOrientationController* controller) {
+  controller_.reset(controller);
+}
+
+void DeviceOrientationDispatcher::startUpdating() {
+  render_view_->Send(new ViewHostMsg_DeviceOrientation_StartUpdating(
+      render_view_->routing_id()));
+  started_ = true;
+}
+
+void DeviceOrientationDispatcher::stopUpdating() {
+  render_view_->Send(new ViewHostMsg_DeviceOrientation_StopUpdating(
+      render_view_->routing_id()));
+  started_ = false;
+}
+
+WebKit::WebDeviceOrientation DeviceOrientationDispatcher::lastOrientation()
+    const {
+  if (!last_update_.get())
+    return WebKit::WebDeviceOrientation::nullOrientation();
+
+  return WebKit::WebDeviceOrientation(last_update_->can_provide_alpha,
+                                      last_update_->alpha,
+                                      last_update_->can_provide_beta,
+                                      last_update_->beta,
+                                      last_update_->can_provide_gamma,
+                                      last_update_->gamma);
+}
+
+void DeviceOrientationDispatcher::OnDeviceOrientationUpdated(
+    const ViewMsg_DeviceOrientationUpdated_Params& p) {
+  last_update_.reset(new ViewMsg_DeviceOrientationUpdated_Params(p));
+
+  WebKit::WebDeviceOrientation orientation(p.can_provide_alpha, p.alpha,
+                                           p.can_provide_beta, p.beta,
+                                           p.can_provide_gamma, p.gamma);
+
+  controller_->didChangeDeviceOrientation(orientation);
+}