1 #ifndef DALI_INTERNAL_EVENT_EVENTS_TAP_GESTURE_RECOGNIZER_H
2 #define DALI_INTERNAL_EVENT_EVENTS_TAP_GESTURE_RECOGNIZER_H
5 * Copyright (c) 2023 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/integration-api/events/point.h>
23 #include <dali/public-api/common/vector-wrapper.h>
27 #include <dali/internal/event/events/gesture-recognizer.h>
28 #include <dali/internal/event/events/tap-gesture/tap-gesture-event.h>
39 struct TapGestureRequest;
42 * When given a set of touch events, this detector attempts to determine if a tap gesture has taken place.
44 class TapGestureRecognizer : public GestureRecognizer
47 using Observer = RecognizerObserver<TapGestureEvent>;
51 * @param[in] coreEventInterface Used to send events to Core.
52 * @param[in] screenSize The size of the screen.
53 * @param[in] request The tap gesture request.
54 * @param[in] maximumAllowedTime The maximum allowed time required in milliseconds.
55 * @param[in] recognizerTime This recognizer time required in milliseconds.
56 * @param[in] maximumMotionAllowedDistance This recognizer distance required.
58 TapGestureRecognizer(Observer& observer, Vector2 screenSize, const TapGestureRequest& request, uint32_t maximumAllowedTime, uint32_t recognizerTime, float maximumMotionAllowedDistance);
63 ~TapGestureRecognizer() override;
67 * @copydoc Dali::Internal::GestureDetector::SendEvent(const Integration::TouchEvent&)
69 void SendEvent(const Integration::TouchEvent& event) override;
72 * @copydoc Dali::Internal::GestureDetector::Update(const Integration::GestureRequest&)
74 void Update(const GestureRequest& request) override;
77 * @brief This method sets the maximum allowed time required to be recognized as a multi tap gesture (millisecond)
79 * @param[in] time The time value in milliseconds
81 void SetMaximumAllowedTime(uint32_t time);
84 * @brief This method sets the recognizer time required to be recognized as a tap gesture (millisecond)
86 * @param[in] time The time value in milliseconds
88 void SetRecognizerTime(uint32_t time);
92 * @brief This method sets the recognizer distance required to be recognized as a tap gesture
94 * This distance is from touch down to touch up to recognize the tap gesture.
96 * @param[in] distance The distance
98 void SetMaximumMotionAllowedDistance(float distance);
103 * Checks if registered taps are within required bounds and emits tap gesture if they are.
105 * @param[in] state current state of incomplete gesture
106 * @param[in] time time of this latest touch event
108 void EmitGesture(GestureState state, uint32_t time);
111 * Initialises tap gesture detector for next tap sequence
113 * @param[in] event registered touch event
114 * @param[in] point position touch event occurred
116 void SetupForTouchDown(const Integration::TouchEvent& event, const Integration::Point& point);
119 * Emit a touch down event for hit testing
121 * @param[in] event registered touch event
123 void EmitPossibleState(const Integration::TouchEvent& event);
126 * Force a touch event sequence to be treated as a single tap
128 * @param[in] time time of this latest touch event
129 * @param[in] point position touch event occurred
131 void EmitSingleTap(uint32_t time, const Integration::Point& point);
136 * @param[in] time time of this latest touch event
137 * @param[in] event registered touch event
139 void EmitTap(uint32_t time, TapGestureEvent& event);
142 * Send the event for processing
144 * @param[in] tap event for processing
146 void ProcessEvent(TapGestureEvent& event);
149 // Reference to the gesture processor for this recognizer
153 * Internal state machine.
157 CLEAR, ///< No gesture detected.
158 TOUCHED, ///< User is touching the screen.
159 REGISTERED, ///< At least one tap has been registered.
160 FAILED, ///< Gesture has failed.
163 State mState; ///< Current state of the detector.
165 Vector2 mTouchPosition; ///< The initial touch down position.
166 uint32_t mTapsRegistered; ///< In current detection, the number of taps registered.
167 uint32_t mTouchTime; ///< The touch down time.
168 uint32_t mLastTapTime; ///< Time last tap gesture was registered
169 uint32_t mDeltaBetweenTouchDownTouchUp; ///< Time from touchdown to touchup
170 uint32_t mMaximumAllowedTime; ///< The maximum allowed time required to be recognized as a multi tap gesture (millisecond)
171 uint32_t mRecognizerTime; ///< The recognizer time required to be recognized as a tap gesture (millisecond)
172 float mMaximumMotionAllowedDistance; ///< The recognizer distance required to be recognized as a tap gesture
175 } // namespace Internal
179 #endif // DALI_INTERNAL_EVENT_EVENTS_TAP_GESTURE_RECOGNIZER_H