1 #ifndef DALI_INTERNAL_ACTIVE_CONSTRAINT_BASE_H
2 #define DALI_INTERNAL_ACTIVE_CONSTRAINT_BASE_H
5 * Copyright (c) 2019 Samsung Electronics Co., Ltd.
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
22 #include <dali/public-api/animation/constraint.h>
23 #include <dali/public-api/common/dali-common.h>
24 #include <dali/public-api/object/base-object.h>
25 #include <dali/internal/common/owner-pointer.h>
26 #include <dali/internal/event/animation/constraint-source-impl.h>
27 #include <dali/internal/update/animation/scene-graph-constraint-base.h>
35 class EventThreadServices;
37 using ObjectContainer = Dali::Vector<Object*>;
38 using ObjectIter = ObjectContainer::Iterator;
45 class AnimatableProperty;
49 * An abstract base class for active constraints.
51 class ConstraintBase : public BaseObject, public Object::Observer
54 using RemoveAction = Dali::Constraint::RemoveAction;
58 * @param[in] object The property owning object.
59 * @param[in] messageController Used to send messages to the update-thread.
60 * @param[in] targetPropertyIndex The index of the property being constrained.
61 * @param[in] sources The sources of the input properties.
63 ConstraintBase( Object& object, Property::Index targetPropertyIndex, SourceContainer& sources );
66 * Clone this constraint for another object.
67 * @param[in] object The object to clone this constraint for
68 * @return A new constraint.
70 ConstraintBase* Clone( Object& object );
75 virtual ~ConstraintBase();
78 * Adds a constraint source to the constraint
80 * @param[in] source The constraint source input to add
82 void AddSource( Source source );
85 * @copydoc Dali::Constraint::Apply()
90 * @copydoc Dali::Constraint::Remove()
95 * Called when the Constraint is removed.
97 * @note This removes the scene-object as well but then does not call back into the target-object.
99 void RemoveInternal();
102 * Retrieve the parent of the constraint.
103 * @return The parent object, or NULL.
108 * @copydoc Dali::Constraint::GetTargetObject()
110 Dali::Handle GetTargetObject();
113 * @copydoc Dali::Constraint::GetTargetProperty()
115 Property::Index GetTargetProperty();
118 * @copydoc Dali::Constraint::SetRemoveAction()
120 void SetRemoveAction(RemoveAction action);
123 * @copydoc Dali::Constraint::GetRemoveAction()
125 RemoveAction GetRemoveAction() const;
128 * @copydoc Dali::Constraint::SetTag()
130 void SetTag( uint32_t tag );
133 * @copydoc Dali::Constraint::GetTag()
135 uint32_t GetTag() const;
137 private: // Object::Observer methods
140 * @copydoc Object::Observer::SceneObjectAdded()
142 virtual void SceneObjectAdded( Object& object );
145 * @copydoc Object::Observer::SceneObjectRemoved()
147 virtual void SceneObjectRemoved( Object& object );
150 * @copydoc Object::Observer::ObjectDestroyed()
152 virtual void ObjectDestroyed( Object& object );
157 * Helper to observe an object, if not already observing it
159 void ObserveObject( Object& object );
162 * Helper to stop observing objects
164 void StopObservation();
166 // To be implemented in derived classes
169 * Clone the actual constraint
171 * @param object to clone to
172 * @return pointer to the clone
174 virtual ConstraintBase* DoClone( Object& object ) = 0;
177 * Connect the constraint
179 virtual void ConnectConstraint() = 0;
184 * Helper to Add an input property to the container of property owners
185 * @param source constraint[in] source used to determine the type and locate the property on the object
186 * @param propertyOwners[out] reference to the container to add
187 * @param componentIndex[out] component index
188 * @return pointer to input property if it was found, nullptr otherwise
190 PropertyInputImpl* AddInputProperty( Source& source, SceneGraph::PropertyOwnerContainer& propertyOwners, int32_t& componentIndex );
193 * Get the event thread services object - used for sending messages to the scene graph
194 * Assert if called from the wrong thread.
195 * This is intentionally inline for performance reasons.
197 * @return The event thread services object
199 inline EventThreadServices& GetEventThreadServices()
201 DALI_ASSERT_DEBUG( EventThreadServices::IsCoreRunning() );
202 return mEventThreadServices;
206 * Get the event thread services object - used for sending messages to the scene graph
207 * Assert if called from the wrong thread
208 * This is intentionally inline for performance reasons.
210 * @return The event thread services object
212 inline const EventThreadServices& GetEventThreadServices() const
214 DALI_ASSERT_DEBUG( EventThreadServices::IsCoreRunning() );
215 return mEventThreadServices;
219 EventThreadServices& mEventThreadServices;
220 Object* mTargetObject; ///< The object owns the constraint.
221 const SceneGraph::ConstraintBase* mSceneGraphConstraint;
222 SourceContainer mSources;
223 ObjectContainer mObservedObjects; // We don't observe the same object twice
224 Property::Index mTargetPropertyIndex;
225 RemoveAction mRemoveAction;
227 bool mApplied:1; ///< Whether the constraint has been applied
228 bool mSourceDestroyed:1; ///< Is set to true if any of our input source objects are destroyed
231 } // namespace Internal
233 // Helpers for public-api forwarding methods
235 inline Internal::ConstraintBase& GetImplementation(Dali::Constraint& constraint)
237 DALI_ASSERT_ALWAYS( constraint && "Constraint handle is empty" );
239 BaseObject& handle = constraint.GetBaseObject();
241 return static_cast<Internal::ConstraintBase&>(handle);
244 inline const Internal::ConstraintBase& GetImplementation(const Dali::Constraint& constraint)
246 DALI_ASSERT_ALWAYS( constraint && "Constraint handle is empty" );
248 const BaseObject& handle = constraint.GetBaseObject();
250 return static_cast<const Internal::ConstraintBase&>(handle);
255 #endif // DALI_INTERNAL_ACTIVE_CONSTRAINT_BASE_H