dali/internal/event/events/gesture-detector-impl.cpp

   1 /*
   2  * Copyright (c) 2017 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/internal/event/events/gesture-detector-impl.h>
  20
  21 // EXTERNAL INCLUDES
  22 #include <algorithm>
  23
  24 // INTERNAL INCLUDES
  25 #include <dali/integration-api/debug.h>
  26 #include <dali/internal/event/events/actor-gesture-data.h>
  27 #include <dali/internal/event/events/gesture-event-processor.h>
  28 #include <dali/internal/event/common/thread-local-storage.h>
  29 #include <dali/internal/event/common/stage-impl.h>
  30
  31 namespace Dali
  32 {
  33
  34 namespace Internal
  35 {
  36
  37 GestureDetector::GestureDetector(Gesture::Type type)
  38 : mType(type),
  39   mGestureEventProcessor(ThreadLocalStorage::Get().GetGestureEventProcessor())
  40 {
  41 }
  42
  43 GestureDetector::~GestureDetector()
  44 {
  45   if ( !mAttachedActors.empty() )
  46   {
  47     for ( GestureDetectorActorContainer::iterator iter = mAttachedActors.begin(), endIter = mAttachedActors.end(); iter != endIter; ++iter )
  48     {
  49       Actor* actor( *iter );
  50       actor->RemoveObserver( *this );
  51       actor->GetGestureData().RemoveGestureDetector( *this );
  52     }
  53
  54     mAttachedActors.clear();
  55
  56     // Guard to allow handle destruction after Core has been destroyed
  57     if ( Stage::IsInstalled() )
  58     {
  59       mGestureEventProcessor.RemoveGestureDetector( this );
  60     }
  61   }
  62 }
  63
  64 void GestureDetector::Attach(Actor& actor)
  65 {
  66   if ( !IsAttached(actor) )
  67   {
  68     // Register with EventProcessor if first actor being added
  69     if ( mAttachedActors.empty() )
  70     {
  71       mGestureEventProcessor.AddGestureDetector(this);
  72     }
  73
  74     mAttachedActors.push_back(&actor);
  75
  76     // We need to observe the actor's destruction
  77     actor.AddObserver(*this);
  78
  79     // Add the detector to the actor (so the actor knows it requires this gesture when going through hit-test algorithm)
  80     actor.GetGestureData().AddGestureDetector( *this );
  81
  82     // Notification for derived classes
  83     OnActorAttach(actor);
  84   }
  85 }
  86
  87 void GestureDetector::Detach(Actor& actor)
  88 {
  89   if ( !mAttachedActors.empty() )
  90   {
  91     GestureDetectorActorContainer::iterator match = find(mAttachedActors.begin(), mAttachedActors.end(), &actor);
  92
  93     if ( match != mAttachedActors.end() )
  94     {
  95       // We no longer need to observe the actor's destruction
  96       actor.RemoveObserver(*this);
  97
  98       // Remove detector from actor-gesture-data
  99       actor.GetGestureData().RemoveGestureDetector( *this );
 100
 101       mAttachedActors.erase(match);
 102
 103       // Notification for derived classes
 104       OnActorDetach(actor);
 105
 106       // Unregister from gesture event processor if we do not have any actors
 107       if ( mAttachedActors.empty() )
 108       {
 109         // Guard to allow handle destruction after Core has been destroyed
 110         if( Stage::IsInstalled() )
 111         {
 112           mGestureEventProcessor.RemoveGestureDetector(this);
 113         }
 114       }
 115     }
 116   }
 117 }
 118
 119 void GestureDetector::DetachAll()
 120 {
 121   if ( !mAttachedActors.empty() )
 122   {
 123     GestureDetectorActorContainer attachedActors(mAttachedActors);
 124
 125     // Clear mAttachedActors before we call OnActorDetach in case derived classes call a method which manipulates mAttachedActors.
 126     mAttachedActors.clear();
 127
 128     for ( GestureDetectorActorContainer::iterator iter = attachedActors.begin(), endIter = attachedActors.end(); iter != endIter; ++iter )
 129     {
 130       Actor* actor(*iter);
 131
 132       // We no longer need to observe the actor's destruction
 133       actor->RemoveObserver(*this);
 134
 135       // Remove detector from actor-gesture-data
 136       actor->GetGestureData().RemoveGestureDetector( *this );
 137
 138       // Notification for derived classes
 139       OnActorDetach(*actor);
 140     }
 141
 142     // Guard to allow handle destruction after Core has been destroyed
 143     if ( Stage::IsInstalled() )
 144     {
 145       // Unregister from gesture event processor
 146       mGestureEventProcessor.RemoveGestureDetector(this);
 147     }
 148   }
 149 }
 150
 151 size_t GestureDetector::GetAttachedActorCount() const
 152 {
 153   return mAttachedActors.size();
 154 }
 155
 156 Dali::Actor GestureDetector::GetAttachedActor(size_t index) const
 157 {
 158   Dali::Actor actor;
 159
 160   if( index < mAttachedActors.size() )
 161   {
 162     actor = Dali::Actor( mAttachedActors[index] );
 163   }
 164
 165   return actor;
 166 }
 167
 168 bool GestureDetector::IsAttached(Actor& actor) const
 169 {
 170   return find(mAttachedActors.begin(), mAttachedActors.end(), &actor) != mAttachedActors.end();
 171 }
 172
 173 void GestureDetector::ObjectDestroyed(Object& object)
 174 {
 175   if ( !mAttachedActors.empty() )
 176   {
 177     GestureDetectorActorContainer::iterator match = find(mAttachedActors.begin(), mAttachedActors.end(), &object);
 178
 179     if ( match != mAttachedActors.end() )
 180     {
 181       mAttachedActors.erase(match);
 182
 183       // Notification for derived classes
 184       OnActorDestroyed(object);
 185
 186       // Unregister from gesture event processor if we do not have any actors
 187       if ( mAttachedActors.empty() )
 188       {
 189         // Guard to allow handle destruction after Core has been destroyed
 190         if ( Stage::IsInstalled() )
 191         {
 192           mGestureEventProcessor.RemoveGestureDetector(this);
 193         }
 194       }
 195     }
 196   }
 197 }
 198
 199 void GestureDetector::SetDefaultProperty( Property::Index index, const Property::Value& property )
 200 {
 201   // None of our properties should be settable from Public API
 202 }
 203
 204 Property::Value GestureDetector::GetDefaultProperty(Property::Index index) const
 205 {
 206   return Property::Value();
 207 }
 208
 209 Property::Value GestureDetector::GetDefaultPropertyCurrentValue( Property::Index index ) const
 210 {
 211   return Property::Value();
 212 }
 213
 214 const SceneGraph::PropertyOwner* GestureDetector::GetSceneObject() const
 215 {
 216   return NULL;
 217 }
 218
 219 const SceneGraph::PropertyBase* GestureDetector::GetSceneObjectAnimatableProperty( Property::Index index ) const
 220 {
 221   return NULL;
 222 }
 223
 224 const PropertyInputImpl* GestureDetector::GetSceneObjectInputProperty( Property::Index index ) const
 225 {
 226   return NULL;
 227 }
 228
 229 } // namespace Internal
 230
 231 } // namespace Dali