1 #ifndef __DALI_ACTIVE_CONSTRAINT_H__
2 #define __DALI_ACTIVE_CONSTRAINT_H__
5 // Copyright (c) 2014 Samsung Electronics Co., Ltd.
7 // Licensed under the Flora License, Version 1.0 (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://floralicense.org/license/
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.
21 * @addtogroup CAPI_DALI_FRAMEWORK
26 #include <dali/public-api/animation/active-constraint-declarations.h>
27 #include <dali/public-api/object/handle.h>
28 #include <dali/public-api/object/property.h>
30 namespace Dali DALI_IMPORT_API
33 namespace Internal DALI_INTERNAL
35 class ActiveConstraintBase;
39 * A constraint which is being applied to an object.
41 class DALI_IMPORT_API ActiveConstraint : public Handle
46 static const Property::Index WEIGHT; ///< Property 0, name "weight", type FLOAT
48 static const float FINAL_WEIGHT; // 1.0f means the constraint is fully-applied, unless weight is still being animated
49 static const float DEFAULT_WEIGHT; // 1.0f
52 static const char* const SIGNAL_APPLIED;
55 * Create an uninitialized Constraint; this can be initialized with Constraint::New()
56 * Calling member functions with an uninitialized Dali::Object is not allowed.
63 virtual ~ActiveConstraint();
66 * @copydoc Dali::BaseHandle::operator=
68 using BaseHandle::operator=;
71 * Retrieve the object which this constraint is targeting.
72 * @return The target object.
74 Handle GetTargetObject();
77 * Retrieve the property which this constraint is targeting.
78 * @return The target property.
80 Property::Index GetTargetProperty();
83 * Set the weight of the constraint; this is a value clamped between 0.0f and 1.0f. The default is 1.0f.
84 * 0.0f means the constraint has no effect, and 1.0f means the constraint is fully-applied.
85 * @note This is an asynchronous method; the value written may not match a value subsequently read with GetCurrentWeight().
86 * @param [in] weight The weight.
88 void SetWeight( float weight );
91 * Retrieve the current weight of the constraint.
92 * @return The current weight.
94 float GetCurrentWeight() const;
97 * This signal is emitted after the apply-time of the constraint has expired.
98 * @note A non-zero apply-time must have been set using Constraint::SetApplyTime().
99 * @return A signal object to Connect() with.
101 ActiveConstraintSignalV2& AppliedSignal();
103 public: // Not intended for use by Application developers
106 * This constructor is used by Dali New() methods
107 * @param [in] constraint A pointer to a newly allocated Dali resource
109 explicit DALI_INTERNAL ActiveConstraint( Internal::ActiveConstraintBase* constraint );
117 #endif // __DALI_ACTIVE_CONSTRAINT_H__