1 #ifndef DALI_OBJECT_REGISTRY_H
2 #define DALI_OBJECT_REGISTRY_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/object/handle.h>
23 #include <dali/public-api/signals/dali-signal.h>
28 * @addtogroup dali_core_object
32 namespace Internal DALI_INTERNAL
38 * @brief The ObjectRegistry notifies it's observers when an object is created.
40 * Handle to the created Object is passed in the call back function.
41 * The Handle is passed as Dali::Object handle, which can be DownCast
42 * to the appropriate type.
44 * Care should be taken to not store the handle in the Observer, as this will
45 * have adverse effect on the life time of the Internal Object. The Handle
46 * should only be used to connect to signals.
49 * ObjectRegistry registry = Stage::GetObjectRegistry();
50 * registry.ObjectCreatedSignal().Connect( ObjectCreatedCallbackFunc );
53 * | %Signal Name | Method |
54 * |------------------|------------------------------|
55 * | objectCreated | @ref ObjectCreatedSignal() |
56 * | objectDestroyed | @ref ObjectDestroyedSignal() |
59 class DALI_CORE_API ObjectRegistry : public BaseHandle
66 * @brief Object created signal.
69 typedef Signal< void ( BaseHandle ) > ObjectCreatedSignalType;
72 * @brief Object destroyed signal.
75 typedef Signal< void ( const Dali::RefObject* ) > ObjectDestroyedSignalType;
78 * @brief Allows the creation of an empty objectRegistry handle.
80 * To retrieve the current objectRegistry,
81 * this handle can be set using Stage::GetCurrent().GetObjectRegistry().
89 * This is non-virtual since derived Handle types must not contain data or virtual methods.
95 * @brief This copy constructor is required for (smart) pointer semantics.
98 * @param[in] handle A reference to the copied handle
100 ObjectRegistry(const ObjectRegistry& handle);
103 * @brief This assignment operator is required for (smart) pointer semantics.
106 * @param[in] rhs A reference to the copied handle
107 * @return A reference to this
109 ObjectRegistry& operator=(const ObjectRegistry& rhs);
114 * @brief This signal is emitted when an object is created.
116 * A callback of the following type may be connected:
118 * void YourCallbackName(BaseHandle object);
121 * @return The signal to connect to
122 * @pre The Object has been initialized.
124 ObjectCreatedSignalType& ObjectCreatedSignal();
127 * @brief This signal is emitted when an object is destroyed.
129 * WARNING: Since this signal is emitted when the object is
130 * in the process of being destroyed, the RefObject pointer
131 * passed in the signal should not be modified in anyways.
132 * And should NOT be used to create an handle. which will
133 * affect the life time of this destroyed object and leads to
134 * undefined behaviour.
136 * The only intended use is for Toolkit controls which want to
137 * keep track of objects being created and destroyed for internal
140 * A callback of the following type may be connected:
142 * void YourCallbackName(const Dali::RefObject* objectPointer);
145 * @return The signal to connect to
146 * @pre The Object has been initialized.
148 ObjectDestroyedSignalType& ObjectDestroyedSignal();
150 public: // Not intended for application developers
154 * @brief This constructor is used by Dali Get() method.
157 * @param[in] objectRegistry A pointer to a Dali resource
159 explicit DALI_INTERNAL ObjectRegistry(Internal::ObjectRegistry* objectRegistry);
168 #endif // DALI_OBJECT_REGISTRY_H