1 #ifndef __DALI_ACTIVE_CONSTRAINT_H__
2 #define __DALI_ACTIVE_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 <dali/public-api/animation/active-constraint-declarations.h>
23 #include <dali/public-api/object/any.h>
24 #include <dali/public-api/object/handle.h>
25 #include <dali/public-api/object/property.h>
30 namespace Internal DALI_INTERNAL
32 class ActiveConstraintBase;
36 * @brief A constraint which is being applied to an object.
38 class DALI_IMPORT_API ActiveConstraint : public Handle
43 static const Property::Index WEIGHT; ///< Property 0, name "weight", type FLOAT
45 static const float FINAL_WEIGHT; ///< 1.0f means the constraint is fully-applied, unless weight is still being animated
46 static const float DEFAULT_WEIGHT; ///< 1.0f
49 static const char* const SIGNAL_APPLIED; ///< name "applied"
52 * @brief Create an uninitialized Constraint; this can be initialized with Constraint::New().
54 * Calling member functions with an uninitialized Dali::Object is not allowed.
59 * @brief Dali::ActiveConstraint is intended as a base class
61 * This is non-virtual since derived Handle types must not contain data or virtual methods.
66 * @brief This copy constructor is required for (smart) pointer semantics.
68 * @param [in] handle A reference to the copied handle
70 ActiveConstraint(const ActiveConstraint& handle);
73 * @brief This assignment operator is required for (smart) pointer semantics.
75 * @param [in] rhs A reference to the copied handle
76 * @return A reference to this
78 ActiveConstraint& operator=(const ActiveConstraint& rhs);
81 * @brief Retrieve the object which this constraint is targeting.
83 * @return The target object.
85 Handle GetTargetObject();
88 * @brief Retrieve the property which this constraint is targeting.
90 * @return The target property.
92 Property::Index GetTargetProperty();
95 * @brief Set the weight of the constraint; this is a value clamped between 0.
97 * The default is 1.0f.
98 * 0.0f means the constraint has no effect, and 1.0f means the constraint is fully-applied.
99 * @note This is an asynchronous method; the value written may not match a value subsequently read with GetCurrentWeight().
100 * @param [in] weight The weight.
102 void SetWeight( float weight );
105 * @brief Retrieve the current weight of the constraint.
107 * @return The current weight.
109 float GetCurrentWeight() const;
112 * @brief This signal is emitted after the apply-time of the constraint has expired.
114 * @note A non-zero apply-time must have been set using Constraint::SetApplyTime().
115 * @return A signal object to Connect() with.
117 ActiveConstraintSignalType& AppliedSignal();
119 public: // Not intended for use by Application developers
122 * @brief This constructor is used by Dali New() methods.
124 * @param [in] constraint A pointer to a newly allocated Dali resource
126 explicit DALI_INTERNAL ActiveConstraint( Internal::ActiveConstraintBase* constraint );
131 #endif // __DALI_ACTIVE_CONSTRAINT_H__