1 #ifndef __DALI_TAP_GESTURE_DETECTOR_H__
2 #define __DALI_TAP_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 TapGestureDetector;
40 * @brief This class emits a signal when a tap gesture occurs that meets the requirements set by the
43 * See @ref TapGestureDetector::SetTapsRequired
45 * A TapGesture is a discrete gesture, which means it does not have any state information attached
46 * to it. Please see TapGesture for more information.
48 * The application programmer can use this gesture detector as follows:
50 * TapGestureDetector detector = TapGestureDetector::New();
51 * detector.Attach(myActor);
52 * detector.DetectedSignal().Connect(this, &MyApplication::OnTap);
56 * @note Multi-touch taps are not currently supported. However, multiple taps (double & triple tap etc.) ARE supported.
61 class DALI_IMPORT_API TapGestureDetector : public GestureDetector
66 * @brief Signal type for detected signal.
69 typedef Signal< void ( Actor, const TapGesture& ) > DetectedSignalType;
71 public: // Creation & Destruction
74 * @brief Create an uninitialized TapGestureDetector; this can be initialized with TapGestureDetector::New().
76 * Calling member functions with an uninitialized TapGestureDetector handle is not allowed.
82 * @brief Create an initialized TapGestureDetector.
84 * By default, this would create a gesture detector which requires one tap with one touch.
86 * @return A handle to a newly allocated Dali resource.
88 static TapGestureDetector New();
91 * @brief Create an initialized TapGestureDetector with the specified parameters.
94 * @param[in] tapsRequired The minimum & maximum number of taps required.
95 * @return A handle to a newly allocated Dali resource.
97 static TapGestureDetector New( unsigned int tapsRequired );
100 * @brief Downcast a handle to TapGestureDetector handle.
102 * If handle points to a TapGestureDetector object the
103 * downcast produces valid handle. If not the returned handle is left uninitialized.
105 * @param[in] handle Handle to an object
106 * @return Handle to a TapGestureDetector object or an uninitialized handle
108 static TapGestureDetector DownCast( BaseHandle handle );
113 * This is non-virtual since derived Handle types must not contain data or virtual methods.
116 ~TapGestureDetector();
119 * @brief This copy constructor is required for (smart) pointer semantics.
122 * @param [in] handle A reference to the copied handle
124 TapGestureDetector(const TapGestureDetector& handle);
127 * @brief This assignment operator is required for (smart) pointer semantics.
130 * @param [in] rhs A reference to the copied handle
131 * @return A reference to this
133 TapGestureDetector& operator=(const TapGestureDetector& rhs);
138 * @brief Set the minimum number of taps required.
140 * The tap count is the number of times a user should "tap" the screen.
142 * @param[in] minimumTaps The minimum taps required.
143 * @pre The gesture detector has been initialized.
144 * @note The default is '1'.
146 void SetMinimumTapsRequired( unsigned int minimumTaps );
149 * @brief Set the maximum number of taps required.
151 * The tap count is the number of times a user should "tap" the screen.
153 * @param[in] maximumTaps The maximum taps required.
154 * @pre The gesture detector has been initialized.
155 * @note The default is '1'.
157 void SetMaximumTapsRequired( unsigned int maximumTaps );
162 * @brief Retrieves the minimum number of taps required.
165 * @return The minimum taps required.
166 * @pre The gesture detector has been initialized.
168 unsigned int GetMinimumTapsRequired() const;
171 * @brief Retrieves the maximum number of taps required.
174 * @return The maximum taps required.
175 * @pre The gesture detector has been initialized.
177 unsigned int GetMaximumTapsRequired() const;
182 * @brief This signal is emitted when the specified tap is detected on the attached actor.
184 * A callback of the following type may be connected:
186 * void YourCallbackName( Actor actor, const TapGesture& gesture );
189 * @return The signal to connect to.
190 * @pre The gesture detector has been initialized.
192 DetectedSignalType& DetectedSignal();
194 public: // Not intended for Application developers
197 * @brief This constructor is used by TapGestureDetector::New() methods.
200 * @param [in] internal A pointer to a newly allocated Dali resource.
202 explicit DALI_INTERNAL TapGestureDetector(Internal::TapGestureDetector* internal);
211 #endif // __DALI_TAP_GESTURE_DETECTOR_H__