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