1 #ifndef __DALI_PINCH_GESTURE_DETECTOR_H__
2 #define __DALI_PINCH_GESTURE_DETECTOR_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 <dali/public-api/events/gesture-detector.h>
23 #include <dali/public-api/signals/dali-signal.h>
28 * @addtogroup dali-core-events
32 namespace Internal DALI_INTERNAL
34 class PinchGestureDetector;
40 * @brief This class looks for pinching gestures involving two touches.
42 * It tries to detect when the user moves two touch points towards or
43 * away from each other. Please see PinchGesture for more
46 * The application programmer can use this gesture detector as follows:
48 * PinchGestureDetector detector = PinchGestureDetector::New();
49 * detector.Attach(myActor);
50 * detector.DetectedSignal().Connect(this, &MyApplication::OnPinch);
56 * | %Signal Name | Method |
57 * |----------------|-----------------------|
58 * | pinch-detected | @ref DetectedSignal() |
60 class DALI_IMPORT_API PinchGestureDetector : public GestureDetector
67 typedef Signal< void ( Actor, const PinchGesture& ) > DetectedSignalType;
69 public: // Creation & Destruction
72 * @brief Create an uninitialized PinchGestureDetector; this can be initialized with PinchGestureDetector::New().
74 * Calling member functions with an uninitialized Dali::Object is not allowed.
76 PinchGestureDetector();
79 * @brief Create an initialized PinchGestureDetector.
81 * @return A handle to a newly allocated Dali resource.
83 static PinchGestureDetector New();
86 * @brief Downcast an Object handle to PinchGestureDetector handle.
88 * If handle points to a PinchGestureDetector object the
89 * downcast produces valid handle. If not the returned handle is left uninitialized.
90 * @param[in] handle to An object
91 * @return handle to a PinchGestureDetector object or an uninitialized handle
93 static PinchGestureDetector DownCast( BaseHandle handle );
98 * This is non-virtual since derived Handle types must not contain data or virtual methods.
100 ~PinchGestureDetector();
103 * @brief This copy constructor is required for (smart) pointer semantics.
105 * @param [in] handle A reference to the copied handle
107 PinchGestureDetector(const PinchGestureDetector& handle);
110 * @brief This assignment operator is required for (smart) pointer semantics.
112 * @param [in] rhs A reference to the copied handle
113 * @return A reference to this
115 PinchGestureDetector& operator=(const PinchGestureDetector& rhs);
120 * @brief This signal is emitted when the pinch gesture is detected on the attached actor.
122 * A callback of the following type may be connected:
124 * void YourCallbackName( Actor actor, const PinchGesture& gesture );
126 * @pre The gesture detector has been initialized.
127 * @return The signal to connect to.
129 DetectedSignalType& DetectedSignal();
131 public: // Not intended for Application developers
134 * @brief This constructor is used by Dali New() methods.
136 * @param [in] internal A pointer to a newly allocated Dali resource.
138 explicit DALI_INTERNAL PinchGestureDetector(Internal::PinchGestureDetector* internal);
147 #endif // __DALI_PINCH_GESTURE_DETECTOR_H__