1 #ifndef __DALI_INTERNAL_SCENE_GRAPH_CONSTRAINT_H__
2 #define __DALI_INTERNAL_SCENE_GRAPH_CONSTRAINT_H__
5 * Copyright (c) 2014 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 <boost/function.hpp>
25 #include <dali/public-api/animation/active-constraint.h>
26 #include <dali/public-api/animation/alpha-functions.h>
27 #include <dali/public-api/common/dali-common.h>
28 #include <dali/internal/event/animation/property-constraint-ptr.h>
29 #include <dali/internal/update/common/animatable-property.h>
30 #include <dali/internal/update/common/property-owner.h>
31 #include <dali/internal/update/animation/scene-graph-constraint-base.h>
32 #include <dali/internal/render/common/performance-monitor.h>
44 * Used to constrain a property of a scene-object.
45 * The constraint function takes another scene-object property as an input.
47 template < class PropertyType, typename PropertyAccessorType >
48 class Constraint : public ConstraintBase
52 typedef typename PropertyConstraintPtr< PropertyType >::Type ConstraintFunctionPtr;
53 typedef boost::function< PropertyType (const PropertyType&, const PropertyType&, float progress) > InterpolatorFunc;
56 * Create a new scene-graph constraint.
57 * @param[in] targetProperty The target property.
58 * @param[in] ownerSet A set of property owners; func is connected to the properties provided by these objects.
59 * @param[in] func The function to calculate the final constrained value.
60 * @param[in] interpolator The function to interpolate between start & final value.
61 * @param[in] customWeight A custom weight property, or NULL if the constraint is using its own.
62 * @return A smart-pointer to a newly allocated constraint.
64 static ConstraintBase* New( const PropertyBase& targetProperty,
65 PropertyOwnerContainer& ownerContainer,
66 ConstraintFunctionPtr func,
67 InterpolatorFunc interpolator,
68 const AnimatableProperty<float>* customWeight )
70 // Scene-graph thread can edit these objects
71 PropertyBase& property = const_cast< PropertyBase& >( targetProperty );
73 return new Constraint< PropertyType, PropertyAccessorType >( property,
88 * Query whether the constraint needs to be applied. If a constraint depends on a set of properties,
89 * then it should be applied when any of those properties have changed.
99 if ( ! mTargetProperty.IsClean() ||
100 mFunc->InputsChanged() ||
101 ! mWeightInput->IsClean() )
106 // We don't need to reapply constraint if none of the properties changed
111 * @copydoc Dali::Internal::SceneGraph::ConstraintBase::Apply()
113 virtual void Apply( BufferIndex updateBufferIndex )
117 return; // Early-out when property owners have been disconnected
120 bool firstApply( mFirstApply );
122 if ( mFunc->InputsInitialized() &&
125 const PropertyType& current = mTargetProperty.Get( updateBufferIndex );
127 // FINAL_WEIGHT means the constraint is fully-applied, unless weight is still being animated
128 if ( ( ! firstApply && ! mWeightInput->IsClean() ) || // We should not rely on the flag state of weight-input on first apply
129 ! Equals( Dali::ActiveConstraint::FINAL_WEIGHT, (*mWeightInput)[updateBufferIndex] ) )
131 // Constraint is not fully-applied; interpolation between start & final values
132 mTargetProperty.Set( updateBufferIndex,
133 mInterpolator( current, mFunc->Apply( updateBufferIndex, current ), (*mWeightInput)[updateBufferIndex] ) );
137 // Constraint is fully-applied; optionally bake the final value
138 if ( Dali::Constraint::Bake == mRemoveAction )
140 mTargetProperty.Bake( updateBufferIndex, mFunc->Apply( updateBufferIndex, current ) );
144 mTargetProperty.Set( updateBufferIndex, mFunc->Apply( updateBufferIndex, current ) );
148 INCREASE_COUNTER(PerformanceMonitor::CONSTRAINTS_APPLIED);
152 INCREASE_COUNTER(PerformanceMonitor::CONSTRAINTS_SKIPPED);
159 * @copydoc Dali::Internal::SceneGraph::Constraint::New()
161 Constraint( PropertyBase& targetProperty,
162 PropertyOwnerContainer& ownerContainer,
163 ConstraintFunctionPtr func,
164 InterpolatorFunc interpolator,
165 const AnimatableProperty<float>* customWeight )
166 : ConstraintBase( ownerContainer ),
167 mTargetProperty( &targetProperty ),
169 mInterpolator( interpolator ),
170 mWeightInput( customWeight ? customWeight : &mWeight)
175 Constraint( const Constraint& constraint );
178 Constraint& operator=( const Constraint& rhs );
181 * @copydoc Dali::Internal::SceneGraph::ConstraintBase::OnDisconnect()
183 virtual void OnDisconnect()
185 // Discard target object/property pointers
186 mTargetProperty.Reset();
192 PropertyAccessorType mTargetProperty; ///< Raw-pointer to the target property. Not owned.
194 ConstraintFunctionPtr mFunc;
196 InterpolatorFunc mInterpolator;
198 const AnimatableProperty<float>* mWeightInput;
201 } // namespace SceneGraph
203 } // namespace Internal
207 #endif // __DALI_INTERNAL_SCENE_GRAPH_CONSTRAINT_H__