1 #ifndef DALI_INTERNAL_LONG_PRESS_GESTURE_RECOGNIZER_H
2 #define DALI_INTERNAL_LONG_PRESS_GESTURE_RECOGNIZER_H
5 * Copyright (c) 2021 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.
25 #include <dali/internal/event/events/gesture-recognizer.h>
26 #include <dali/internal/event/events/long-press-gesture/long-press-gesture-event.h>
38 struct LongPressGestureRequest;
39 class CoreEventInterface;
42 * When given a set of touch events, this detector attempts to determine if a long press gesture has taken place.
43 * Emits a LongPressGestureEvent (state = GestureState::STARTED) when a long press has been detected (Touch held down for more than duration).
44 * Emits a further LongPressGestureEvent (state = GestureState::FINISHED) when a long press has been completed (Touch Release).
46 class LongPressGestureRecognizer : public GestureRecognizer
49 using Observer = RecognizerObserver<LongPressGestureEvent>;
53 * @param[in] coreEventInterface Used to send events to Core.
54 * @param[in] screenSize The size of the screen.
55 * @param[in] request The long press gesture request.
56 * @param[in] minimumHoldingTime The minimum holding time required in milliseconds.
58 LongPressGestureRecognizer(Observer& observer, Vector2 screenSize, const LongPressGestureRequest& request, uint32_t minimumHoldingTime);
63 ~LongPressGestureRecognizer() 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 minimum holding time required to be recognized as a long press gesture
79 * @param[in] value The time value in milliseconds
81 void SetMinimumHoldingTime(uint32_t time);
86 * @return will return false; one-shot timer.
91 * Emits the long press gesture if all conditions are applicable.
92 * @param[in] state The state of this gesture event.
94 void EmitGesture(GestureState state);
97 // Reference to the gesture processor for this recognizer
101 * Internal state machine.
105 CLEAR, ///< No gesture detected.
106 TOUCHED, ///< User is touching the screen.
107 FAILED, ///< Gesture has failed.
108 FINISHED ///< Gesture has been detected and sent.
111 State mState; ///< The current state of the detector.
113 unsigned int mMinimumTouchesRequired; ///< The minimum touches required before emitting a long press.
114 unsigned int mMaximumTouchesRequired; ///< The maximum touches allowable. Any more and a long press is not emitted.
116 std::map<int, Vector2> mTouchPositions; ///< A map with all the touch down positions.
117 uint32_t mTouchTime; ///< The time we first pressed down.
121 uint32_t mMinimumHoldingTime;
124 } // namespace Internal
128 #endif // DALI_INTERNAL_LONG_PRESS_GESTURE_RECOGNIZER_H