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-v2.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 class DALI_IMPORT_API ObjectRegistry : public BaseHandle
57 static const char* const SIGNAL_OBJECT_CREATED; ///< Created signal name
58 static const char* const SIGNAL_OBJECT_DESTROYED; ///< Destroyed signal name
63 * @brief Object created signal
65 typedef SignalV2< void (BaseHandle) > ObjectCreatedSignalV2;
68 * @brief Object destroyed signal
70 typedef SignalV2< void (const Dali::RefObject*) > ObjectDestroyedSignalV2;
73 * @brief Allows the creation of an empty objectRegistry handle.
75 * To retrieve the current objectRegistry,
76 * this handle can be set using Stage::GetCurrent().GetObjectRegistry().
83 * This is non-virtual since derived Handle types must not contain data or virtual methods.
88 * @brief This copy constructor is required for (smart) pointer semantics.
90 * @param [in] handle A reference to the copied handle
92 ObjectRegistry(const ObjectRegistry& handle);
95 * @brief This assignment operator is required for (smart) pointer semantics.
97 * @param [in] rhs A reference to the copied handle
98 * @return A reference to this
100 ObjectRegistry& operator=(const ObjectRegistry& rhs);
103 * @brief This method is defined to allow assignment of the NULL value,
104 * and will throw an exception if passed any other value.
106 * Assigning to NULL is an alias for Reset().
107 * @param [in] rhs A NULL pointer
108 * @return A reference to this handle
110 ObjectRegistry& operator=(BaseHandle::NullType* rhs);
115 * @brief This signal is emitted when an object is created.
117 * A callback of the following type may be connected:
119 * void YourCallbackName(BaseHandle object);
121 * @pre The Object has been initialized.
122 * @return The signal to connect to.
124 ObjectCreatedSignalV2& 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);
144 * @pre The Object has been initialized.
145 * @return The signal to connect to.
147 ObjectDestroyedSignalV2& ObjectDestroyedSignal();
149 public: // Not intended for application developers
152 * @brief This constructor is used by Dali Get() method.
154 * @param [in] objectRegistry A pointer to a Dali resource
156 explicit DALI_INTERNAL ObjectRegistry(Internal::ObjectRegistry* objectRegistry);
161 #endif // __DALI_OBJECT_REGISTRY_H__