dali/internal/event/events/actor-observer.cpp

   1 /*
   2  * Copyright (c) 2021 Samsung Electronics Co., Ltd.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  *
  16  */
  17
  18 // CLASS HEADER
  19 #include <dali/integration-api/debug.h>
  20 #include <dali/internal/event/actors/actor-impl.h>
  21 #include <dali/internal/event/events/actor-observer.h>
  22
  23 namespace Dali
  24 {
  25 namespace Internal
  26 {
  27 namespace
  28 {
  29 #if defined(DEBUG_ENABLED)
  30 Debug::Filter* gLogFilter = Debug::Filter::New(Debug::NoLogging, false, "LOG_ACTOR_OBSERVER");
  31 #endif // defined(DEBUG_ENABLED)
  32 } // namespace
  33
  34 ActorObserver::ActorObserver()
  35 : ActorObserver(nullptr)
  36 {
  37 }
  38
  39 ActorObserver::ActorObserver(CallbackBase* callback)
  40 : mActor(nullptr),
  41   mActorDisconnected(false),
  42   mRemoveCallback(callback)
  43 {
  44   DALI_LOG_TRACE_METHOD(gLogFilter);
  45 }
  46
  47 ActorObserver::~ActorObserver()
  48 {
  49   DALI_LOG_TRACE_METHOD(gLogFilter);
  50   SetActor(nullptr);
  51
  52   delete mRemoveCallback;
  53 }
  54
  55 ActorObserver::ActorObserver(ActorObserver&& other)
  56 : ActorObserver(nullptr)
  57 {
  58   operator=(std::move(other));
  59 }
  60
  61 ActorObserver& ActorObserver::operator=(ActorObserver&& other)
  62 {
  63   if(this != &other)
  64   {
  65     SetActor(other.mActor);
  66     mActorDisconnected = other.mActorDisconnected;
  67     mRemoveCallback    = other.mRemoveCallback;
  68     other.ResetActor();
  69     other.mRemoveCallback = nullptr;
  70   }
  71   return *this;
  72 }
  73
  74 Actor* ActorObserver::GetActor() const
  75 {
  76   return mActorDisconnected ? nullptr : mActor;
  77 }
  78
  79 void ActorObserver::SetActor(Actor* actor)
  80 {
  81   DALI_LOG_TRACE_METHOD(gLogFilter);
  82
  83   if(mActor != actor)
  84   {
  85     ResetActor();
  86
  87     mActor = actor;
  88
  89     if(mActor)
  90     {
  91       mActor->AddObserver(*this);
  92       DALI_LOG_INFO(gLogFilter, Debug::Verbose, "Start Observing:            %p\n", mActor);
  93     }
  94   }
  95
  96   // Make sure this flag is unset (as we may have been disconnected if it's the same actor)
  97   mActorDisconnected = false;
  98 }
  99
 100 void ActorObserver::ResetActor()
 101 {
 102   if(mActor)
 103   {
 104     DALI_LOG_INFO(gLogFilter, Debug::Verbose, "Stop Observing:             %p\n", mActor);
 105     mActor->RemoveObserver(*this);
 106     mActor             = nullptr;
 107     mActorDisconnected = false;
 108   }
 109 }
 110
 111 void ActorObserver::SceneObjectAdded(Object& object)
 112 {
 113   DALI_LOG_TRACE_METHOD(gLogFilter);
 114
 115   if(mActor == &object)
 116   {
 117     mActorDisconnected = false;
 118   }
 119 }
 120
 121 void ActorObserver::SceneObjectRemoved(Object& object)
 122 {
 123   DALI_LOG_TRACE_METHOD(gLogFilter);
 124
 125   if(mActor == &object)
 126   {
 127     if(mRemoveCallback)
 128     {
 129       CallbackBase::Execute(*mRemoveCallback, mActor);
 130     }
 131
 132     // do not call object.RemoveObserver here, object is currently iterating through observers
 133     mActorDisconnected = true;
 134   }
 135 }
 136
 137 void ActorObserver::ObjectDestroyed(Object& object)
 138 {
 139   DALI_LOG_TRACE_METHOD(gLogFilter);
 140
 141   if(mActor == &object)
 142   {
 143     DALI_LOG_INFO(gLogFilter, Debug::Verbose, "Stop Observing:             %p\n", mActor);
 144     mActor = nullptr;
 145   }
 146 }
 147
 148 } // namespace Internal
 149
 150 } // namespace Dali