1 #ifndef __DALI_OBJECT_REGISTRY_H__
2 #define __DALI_OBJECT_REGISTRY_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/object/handle.h>
26 #include <dali/public-api/signals/dali-signal.h>
31 namespace Internal DALI_INTERNAL
37 * @brief The ObjectRegistry notifies it's observers when an object is created.
39 * Handle to the created Object is passed in the call back function.
40 * The Handle is passed as Dali::Object handle, which can be DownCast
41 * to the appropriate type.
43 * Care should be taken to not store the handle in the Observer, as this will
44 * have adverse effect on the life time of the Internal Object. The Handle
45 * should only be used to connect to signals
48 * ObjectRegistry registry = Stage::GetObjectRegistry();
49 * registry.ObjectCreatedSignal().Connect( ObjectCreatedCallbackFunc );
52 * | %Signal Name | Method |
53 * |------------------|------------------------------|
54 * | object-created | @ref ObjectCreatedSignal() |
55 * | object-destroyed | @ref ObjectDestroyedSignal() |
57 class DALI_IMPORT_API ObjectRegistry : public BaseHandle
64 * @brief Object created signal
66 typedef Signal< void ( BaseHandle ) > ObjectCreatedSignalType;
69 * @brief Object destroyed signal
71 typedef Signal< void ( const Dali::RefObject* ) > ObjectDestroyedSignalType;
74 * @brief Allows the creation of an empty objectRegistry handle.
76 * To retrieve the current objectRegistry,
77 * this handle can be set using Stage::GetCurrent().GetObjectRegistry().
84 * This is non-virtual since derived Handle types must not contain data or virtual methods.
89 * @brief This copy constructor is required for (smart) pointer semantics.
91 * @param [in] handle A reference to the copied handle
93 ObjectRegistry(const ObjectRegistry& handle);
96 * @brief This assignment operator is required for (smart) pointer semantics.
98 * @param [in] rhs A reference to the copied handle
99 * @return A reference to this
101 ObjectRegistry& operator=(const ObjectRegistry& rhs);
106 * @brief This signal is emitted when an object is created.
108 * A callback of the following type may be connected:
110 * void YourCallbackName(BaseHandle object);
112 * @pre The Object has been initialized.
113 * @return The signal to connect to.
115 ObjectCreatedSignalType& ObjectCreatedSignal();
118 * @brief This signal is emitted when an object is destroyed.
120 * WARNING: Since this signal is emitted when the object is
121 * in the process of being destroyed, the RefObject pointer
122 * passed in the signal should not be modified in anyways.
123 * And should NOT be used to create an handle. which will
124 * affect the life time of this destroyed object and leads to
125 * undefined behaviour.
127 * The only intended use is for Toolkit controls which want to
128 * keep track of objects being created and destroyed for internal
131 * A callback of the following type may be connected:
133 * void YourCallbackName(const Dali::RefObject* objectPointer);
135 * @pre The Object has been initialized.
136 * @return The signal to connect to.
138 ObjectDestroyedSignalType& ObjectDestroyedSignal();
140 public: // Not intended for application developers
143 * @brief This constructor is used by Dali Get() method.
145 * @param [in] objectRegistry A pointer to a Dali resource
147 explicit DALI_INTERNAL ObjectRegistry(Internal::ObjectRegistry* objectRegistry);
152 #endif // __DALI_OBJECT_REGISTRY_H__