ppapi/cpp/extensions/event_base.cc

   1 // Copyright (c) 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 "ppapi/cpp/extensions/event_base.h"
   6
   7 #include "ppapi/cpp/extensions/dev/events_dev.h"
   8
   9 namespace pp {
  10 namespace ext {
  11 namespace internal {
  12
  13 GenericEventBase::GenericEventBase(
  14     const InstanceHandle& instance,
  15     const PP_Ext_EventListener& pp_listener)
  16     : instance_(instance),
  17       listener_id_(0),
  18       pp_listener_(pp_listener) {
  19 }
  20
  21 GenericEventBase::~GenericEventBase() {
  22   StopListening();
  23 }
  24
  25 bool GenericEventBase::StartListening() {
  26   if (IsListening())
  27     return true;
  28
  29   listener_id_ = events::Events_Dev::AddListener(instance_.pp_instance(),
  30                                                  pp_listener_);
  31   return IsListening();
  32 }
  33
  34 void GenericEventBase::StopListening() {
  35   if (!IsListening())
  36     return;
  37
  38   events::Events_Dev::RemoveListener(instance_.pp_instance(), listener_id_);
  39   listener_id_ = 0;
  40 }
  41
  42 }  // namespace internal
  43 }  // namespace ext
  44 }  // namespace pp