content/renderer/device_sensors/device_light_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 "content/renderer/device_sensors/device_light_event_pump.h"
   6
   7 #include "content/common/device_sensors/device_light_messages.h"
   8 #include "content/public/renderer/render_thread.h"
   9 #include "third_party/WebKit/public/platform/WebDeviceLightListener.h"
  10
  11 namespace {
  12 // Default delay between subsequent firing of DeviceLight events.
  13 const int kDefaultLightPumpDelayMillis = 200;
  14 }  // namespace
  15
  16 namespace content {
  17
  18 DeviceLightEventPump::DeviceLightEventPump(RenderThread* thread)
  19     : DeviceSensorEventPump<blink::WebDeviceLightListener>(thread),
  20       last_seen_data_(-1) {
  21   pump_delay_millis_ = kDefaultLightPumpDelayMillis;
  22 }
  23
  24 DeviceLightEventPump::~DeviceLightEventPump() {
  25 }
  26
  27 bool DeviceLightEventPump::OnControlMessageReceived(
  28     const IPC::Message& message) {
  29   bool handled = true;
  30   IPC_BEGIN_MESSAGE_MAP(DeviceLightEventPump, message)
  31     IPC_MESSAGE_HANDLER(DeviceLightMsg_DidStartPolling, OnDidStart)
  32     IPC_MESSAGE_UNHANDLED(handled = false)
  33   IPC_END_MESSAGE_MAP()
  34   return handled;
  35 }
  36
  37 void DeviceLightEventPump::FireEvent() {
  38   DCHECK(listener());
  39   DeviceLightData data;
  40   bool did_return_light_data = reader_->GetLatestData(&data);
  41   if (did_return_light_data && data.value != last_seen_data_) {
  42     last_seen_data_ = data.value;
  43     listener()->didChangeDeviceLight(data.value);
  44   }
  45 }
  46
  47 bool DeviceLightEventPump::InitializeReader(base::SharedMemoryHandle handle) {
  48   if (!reader_)
  49     reader_.reset(new DeviceLightSharedMemoryReader());
  50   return reader_->Initialize(handle);
  51 }
  52
  53 void DeviceLightEventPump::SendStartMessage() {
  54   RenderThread::Get()->Send(new DeviceLightHostMsg_StartPolling());
  55 }
  56
  57 void DeviceLightEventPump::SendStopMessage() {
  58   last_seen_data_ = -1;
  59   RenderThread::Get()->Send(new DeviceLightHostMsg_StopPolling());
  60 }
  61
  62 void DeviceLightEventPump::SendFakeDataForTesting(void* fake_data) {
  63   double data = *static_cast<double*>(fake_data);
  64
  65   listener()->didChangeDeviceLight(data);
  66 }
  67
  68 }  // namespace content