src/content/browser/device_orientation/device_orientation_message_filter.cc

   1 // Copyright 2013 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 "content/browser/device_orientation/device_orientation_message_filter.h"
   6
   7 #include "content/browser/device_orientation/device_inertial_sensor_service.h"
   8 #include "content/common/device_orientation/device_orientation_messages.h"
   9
  10 namespace content {
  11
  12 DeviceOrientationMessageFilter::DeviceOrientationMessageFilter()
  13     : is_started_(false) {
  14 }
  15
  16 DeviceOrientationMessageFilter::~DeviceOrientationMessageFilter() {
  17   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
  18   if (is_started_)
  19     DeviceInertialSensorService::GetInstance()->RemoveConsumer(
  20         CONSUMER_TYPE_ORIENTATION);
  21 }
  22
  23 bool DeviceOrientationMessageFilter::OnMessageReceived(
  24     const IPC::Message& message,
  25     bool* message_was_ok) {
  26   bool handled = true;
  27   IPC_BEGIN_MESSAGE_MAP_EX(DeviceOrientationMessageFilter,
  28                            message,
  29                            *message_was_ok)
  30     IPC_MESSAGE_HANDLER(DeviceOrientationHostMsg_StartPolling,
  31                         OnDeviceOrientationStartPolling)
  32     IPC_MESSAGE_HANDLER(DeviceOrientationHostMsg_StopPolling,
  33                         OnDeviceOrientationStopPolling)
  34     IPC_MESSAGE_UNHANDLED(handled = false)
  35   IPC_END_MESSAGE_MAP_EX()
  36   return handled;
  37 }
  38
  39 void DeviceOrientationMessageFilter::OnDeviceOrientationStartPolling() {
  40   DCHECK(!is_started_);
  41   if (is_started_)
  42     return;
  43   is_started_ = true;
  44   DeviceInertialSensorService::GetInstance()->AddConsumer(
  45       CONSUMER_TYPE_ORIENTATION);
  46   DidStartDeviceOrientationPolling();
  47 }
  48
  49 void DeviceOrientationMessageFilter::OnDeviceOrientationStopPolling() {
  50   DCHECK(is_started_);
  51   if (!is_started_)
  52     return;
  53   is_started_ = false;
  54   DeviceInertialSensorService::GetInstance()->RemoveConsumer(
  55       CONSUMER_TYPE_ORIENTATION);
  56 }
  57
  58 void DeviceOrientationMessageFilter::DidStartDeviceOrientationPolling() {
  59   Send(new DeviceOrientationMsg_DidStartPolling(
  60       DeviceInertialSensorService::GetInstance()->
  61           GetSharedMemoryHandleForProcess(
  62               CONSUMER_TYPE_ORIENTATION,
  63               PeerHandle())));
  64 }
  65
  66 }  // namespace content