content/renderer/device_sensors/device_motion_event_pump.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "device_motion_event_pump.h"
   6
   7 #include "content/common/device_sensors/device_motion_messages.h"
   8 #include "content/public/renderer/render_thread.h"
   9 #include "third_party/WebKit/public/platform/WebDeviceMotionListener.h"
  10
  11 namespace content {
  12
  13 DeviceMotionEventPump::DeviceMotionEventPump()
  14     : DeviceSensorEventPump(), listener_(0) {
  15 }
  16
  17 DeviceMotionEventPump::DeviceMotionEventPump(int pump_delay_millis)
  18     : DeviceSensorEventPump(pump_delay_millis), listener_(0) {
  19 }
  20
  21 DeviceMotionEventPump::~DeviceMotionEventPump() {
  22 }
  23
  24 bool DeviceMotionEventPump::SetListener(
  25     blink::WebDeviceMotionListener* listener) {
  26   listener_ = listener;
  27   return listener_ ? RequestStart() : Stop();
  28 }
  29
  30 bool DeviceMotionEventPump::OnControlMessageReceived(
  31     const IPC::Message& message) {
  32   bool handled = true;
  33   IPC_BEGIN_MESSAGE_MAP(DeviceMotionEventPump, message)
  34     IPC_MESSAGE_HANDLER(DeviceMotionMsg_DidStartPolling, OnDidStart)
  35     IPC_MESSAGE_UNHANDLED(handled = false)
  36   IPC_END_MESSAGE_MAP()
  37   return handled;
  38 }
  39
  40 void DeviceMotionEventPump::FireEvent() {
  41   DCHECK(listener_);
  42   blink::WebDeviceMotionData data;
  43   if (reader_->GetLatestData(&data) && data.allAvailableSensorsAreActive)
  44     listener_->didChangeDeviceMotion(data);
  45 }
  46
  47 bool DeviceMotionEventPump::InitializeReader(base::SharedMemoryHandle handle) {
  48   if (!reader_)
  49     reader_.reset(new DeviceMotionSharedMemoryReader());
  50   return reader_->Initialize(handle);
  51 }
  52
  53 bool DeviceMotionEventPump::SendStartMessage() {
  54   return RenderThread::Get()->Send(new DeviceMotionHostMsg_StartPolling());
  55 }
  56
  57
  58 bool DeviceMotionEventPump::SendStopMessage() {
  59   return RenderThread::Get()->Send(new DeviceMotionHostMsg_StopPolling());
  60 }
  61
  62 }  // namespace content