Implements part of Device Motion in the Renderer

content/renderer/device_motion_dispatcher.cc

+// Copyright (c) 2012 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/renderer/device_motion_dispatcher.h"
+
+#include "content/common/device_motion_messages.h"
+#include "content/renderer/render_view_impl.h"
+#include "third_party/WebKit/Source/Platform/chromium/public/WebDeviceMotionData.h"
+#include "third_party/WebKit/Source/Platform/chromium/public/WebDeviceMotionDetectorClient.h"
+
+DeviceMotionDispatcher::DeviceMotionDispatcher(
+    RenderViewImpl* render_view)
+    : content::RenderViewObserver(render_view),
+      client_(NULL),
+      started_(false) {
+}
+
+DeviceMotionDispatcher::~DeviceMotionDispatcher() {
+  if (started_)
+    stopUpdating();
+}
+
+bool DeviceMotionDispatcher::OnMessageReceived(const IPC::Message& msg) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP(DeviceMotionDispatcher, msg)
+    IPC_MESSAGE_HANDLER(DeviceMotionMsg_Updated, OnDeviceMotionUpdated)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+  return handled;
+}
+
+void DeviceMotionDispatcher::startUpdating(
+    WebKit::WebDeviceMotionDetectorClient* client) {
+  client_.reset(client);
+  Send(new DeviceMotionHostMsg_StartUpdating(routing_id()));
+  started_ = true;
+}
+
+void DeviceMotionDispatcher::stopUpdating() {
+  Send(new DeviceMotionHostMsg_StopUpdating(routing_id()));
+  started_ = false;
+}
+
+WebKit::WebDeviceMotionData DeviceMotionDispatcher::lastMotion()
+    const {
+  return last_motion_;
+}
+
+void DeviceMotionDispatcher::OnDeviceMotionUpdated(
+    const DeviceMotionMsg_Updated_Params& p) {
+  if (client_ == NULL)
+    return;
+

[hans, 2012/08/16 16:38:40]

should last_motion_ be reset here before we start initializing it?

[aousterh, 2012/08/16 17:21:05]

Good point. Done.

+  if (p.can_provide_acceleration_x || p.can_provide_acceleration_y ||
+      p.can_provide_acceleration_z)
+    last_motion_.initializeAcceleration(p.can_provide_acceleration_x,
+                                        p.acceleration_x,
+                                        p.can_provide_acceleration_y,
+                                        p.acceleration_y,
+                                        p.can_provide_acceleration_z,
+                                        p.acceleration_z);
+
+  if (p.can_provide_acceleration_including_gravity_x ||
+      p.can_provide_acceleration_including_gravity_y ||
+      p.can_provide_acceleration_including_gravity_z)
+    last_motion_.initializeAccelerationIncludingGravity(
+        p.can_provide_acceleration_including_gravity_x,
+        p.acceleration_including_gravity_x,
+        p.can_provide_acceleration_including_gravity_y,
+        p.acceleration_including_gravity_y,
+        p.can_provide_acceleration_including_gravity_z,
+        p.acceleration_including_gravity_z);
+
+  if (p.can_provide_rotation_rate_alpha || p.can_provide_rotation_rate_beta ||
+      p.can_provide_rotation_rate_gamma)
+    last_motion_.initializeRotationRate(p.can_provide_rotation_rate_alpha,
+                                        p.rotation_rate_alpha,
+                                        p.can_provide_rotation_rate_beta,
+                                        p.rotation_rate_beta,
+                                        p.can_provide_rotation_rate_gamma,
+                                        p.rotation_rate_gamma);
+  if (p.can_provide_interval)
+    last_motion_.initializeInterval(p.interval);
+
+  client_->didDetectDeviceMotion(last_motion_);
+}