1 #ifndef __DALI_LINEAR_CONSTRAINER_H__
2 #define __DALI_LINEAR_CONSTRAINER_H__
5 * Copyright (c) 2015 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 <cfloat> //For FLT_MAX
25 #include <dali/public-api/object/handle.h>
26 #include <dali/public-api/object/property-index-ranges.h>
31 namespace Internal DALI_INTERNAL
33 class LinearConstrainer;
38 * LinearConstrainer applies constraints to objects given a linear map.
39 * A linear map is defined by a set of value-progress pairs.
40 * Progress must be normalized between [0,1]. If no progress is defined, the values
41 * are considered to be equally spaced along the x axis.
43 class DALI_IMPORT_API LinearConstrainer : public Handle
48 * @brief An enumeration of properties belonging to the LinearConstrainer class.
54 VALUE = DEFAULT_OBJECT_PROPERTY_START_INDEX, ///< name "value" type Array of float
55 PROGRESS, ///< name "progress" type Array of float
60 * @brief Create an initialized LinearConstrainer handle.
62 * @return a handle to a newly allocated Dali resource.
64 static LinearConstrainer New();
67 * @brief Downcast an Object handle to LinearConstrainer handle.
69 * If handle points to a LinearConstrainer object the downcast produces
70 * valid handle. If not the returned handle is left uninitialized.
71 * @param[in] handle to An object
72 * @return handle to a LinearConstrainer object or an uninitialized handle
74 static LinearConstrainer DownCast( BaseHandle handle );
77 * @brief Create an uninitialized LinearConstrainer handle.
79 * This can be initialized with PathConstrainer::New(). Calling member
80 * functions with an uninitialized Dali::Object is not allowed.
87 * This is non-virtual since derived Handle types must not contain data or virtual methods.
92 * @brief This copy constructor is required for (smart) pointer semantics.
94 * @param [in] handle A reference to the copied handle
96 LinearConstrainer(const LinearConstrainer& handle);
99 * @brief This assignment operator is required for (smart) pointer semantics.
101 * @param [in] rhs A reference to the copied handle
102 * @return A reference to this
104 LinearConstrainer& operator=(const LinearConstrainer& rhs);
107 * @brief Applies the linear constraint to the target property
109 * @param[in] target Property to be constrained
110 * @param[in] source Property used as parameter for the path
111 * @param[in] range The range of values in the source property which will be mapped to [0,1]
112 * @param[in] wrap Wrapping domain. Source property will be wrapped in the domain [wrap.x,wrap.y] before mapping to [0,1]
114 void Apply( Dali::Property target, Dali::Property source, const Vector2& range, const Vector2& wrap = Vector2(-FLT_MAX, FLT_MAX) );
117 * @brief Removes the linear constraint in the target object
119 * @param[in] target A handle to an object constrained by the LinearConstrainer
121 void Remove( Dali::Handle& target );
123 public: // Not intended for application developers
125 * @brief This constructor is used by Dali::New() methods.
127 * @param[in] pathConstrainer A pointer to an internal PathConstrainer resource
129 explicit DALI_INTERNAL LinearConstrainer(Internal::LinearConstrainer* pathConstrainer);
134 #endif // __DALI_LINEAR_CONSTRAINER_H__