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 TapGestureDetector::SetTapsRequired
45 * A Tap Gesture 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.
59 * | %Signal Name | Method |
60 * |--------------|-----------------------|
61 * | tapDetected | @ref DetectedSignal() |
65 class DALI_IMPORT_API TapGestureDetector : public GestureDetector
70 * @brief Signal type for detected signal.
73 typedef Signal< void ( Actor, const TapGesture& ) > DetectedSignalType;
75 public: // Creation & Destruction
78 * @brief Create an uninitialized TapGestureDetector; this can be initialized with TapGestureDetector::New().
80 * Calling member functions with an uninitialized Dali::Object is not allowed.
86 * @brief Create an initialized TapGestureDetector.
88 * By default, this would create a gesture detector which requires one tap with one touch.
90 * @return A handle to a newly allocated Dali resource.
92 static TapGestureDetector New();
95 * @brief Create an initialized TapGestureDetector with the specified parameters.
98 * @param[in] tapsRequired The minimum & maximum number of taps required.
99 * @return A handle to a newly allocated Dali resource.
101 static TapGestureDetector New( unsigned int tapsRequired );
104 * @brief Downcast an Object handle to TapGestureDetector handle.
106 * If handle points to a TapGestureDetector object the
107 * downcast produces valid handle. If not the returned handle is left uninitialized.
109 * @param[in] handle to An object
110 * @return handle to a TapGestureDetector object or an uninitialized handle
112 static TapGestureDetector DownCast( BaseHandle handle );
117 * This is non-virtual since derived Handle types must not contain data or virtual methods.
120 ~TapGestureDetector();
123 * @brief This copy constructor is required for (smart) pointer semantics.
126 * @param [in] handle A reference to the copied handle
128 TapGestureDetector(const TapGestureDetector& handle);
131 * @brief This assignment operator is required for (smart) pointer semantics.
134 * @param [in] rhs A reference to the copied handle
135 * @return A reference to this
137 TapGestureDetector& operator=(const TapGestureDetector& rhs);
142 * @brief Set the minimum number of taps required.
144 * The tap count is the number of times a user should "tap" the screen.
146 * @param[in] minimumTaps The minimum taps required.
147 * @pre The gesture detector has been initialized.
148 * @note The default is '1'.
150 void SetMinimumTapsRequired( unsigned int minimumTaps );
153 * @brief Set the maximum number of taps required.
155 * The tap count is the number of times a user should "tap" the screen.
157 * @param[in] maximumTaps The maximum taps required.
158 * @pre The gesture detector has been initialized.
159 * @note The default is '1'.
161 void SetMaximumTapsRequired( unsigned int maximumTaps );
166 * @brief Retrieves the minimum number of taps required.
169 * @return The minimum taps required.
170 * @pre The gesture detector has been initialized.
172 unsigned int GetMinimumTapsRequired() const;
175 * @brief Retrieves the maximum number of taps required.
178 * @return The maximum taps required.
179 * @pre The gesture detector has been initialized.
181 unsigned int GetMaximumTapsRequired() const;
186 * @brief This signal is emitted when the specified tap is detected on the attached actor.
188 * A callback of the following type may be connected:
190 * void YourCallbackName( Actor actor, const TapGesture& gesture );
193 * @return The signal to connect to.
194 * @pre The gesture detector has been initialized.
196 DetectedSignalType& DetectedSignal();
198 public: // Not intended for Application developers
201 * @brief This constructor is used by Dali New() methods.
204 * @param [in] internal A pointer to a newly allocated Dali resource.
206 explicit DALI_INTERNAL TapGestureDetector(Internal::TapGestureDetector* internal);
215 #endif // __DALI_TAP_GESTURE_DETECTOR_H__