79 lines
3.0 KiB
C#
79 lines
3.0 KiB
C#
/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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* All rights reserved.
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*
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* Licensed under the Oculus SDK License Agreement (the "License");
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* you may not use the Oculus SDK except in compliance with the License,
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* which is provided at the time of installation or download, or which
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* otherwise accompanies this software in either electronic or hard copy form.
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*
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* You may obtain a copy of the License at
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*
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* https://developer.oculus.com/licenses/oculussdk/
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*
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* Unless required by applicable law or agreed to in writing, the Oculus SDK
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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using UnityEngine;
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using UnityEngine.Events;
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using UnityEngine.EventSystems;
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/// <summary>
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/// The SwipeGesture component listens to the drag events to detect if a gesture happened on a particular element in the local X or Y axis.
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/// </summary>
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public class SwipeGesture : UIBehaviour, IBeginDragHandler, IEndDragHandler
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{
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public float gestureMaxDuration = 1;
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public float gestureMinDistanceNormalized = 0.15f;
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[Space(10)]
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public bool invertScroll;
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public enum Axis
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{
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Horizontal = 0,
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Vertical = 1
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}
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public Axis swipeAxis;
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private float startTime;
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private Vector2 startLocalPosition;
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[Space(10)]
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[SerializeField] private UnityEvent<int> swipeExecuted;
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public void OnBeginDrag(PointerEventData eventData)
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{
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startTime = Time.time;
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var viewRect = (RectTransform)transform;
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Vector2 pointerLocalPosition;
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RectTransformUtility.ScreenPointToLocalPointInRectangle(viewRect, eventData.position, eventData.pressEventCamera, out pointerLocalPosition);
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startLocalPosition = pointerLocalPosition;
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}
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public void OnEndDrag(PointerEventData eventData)
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{
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var duration = Time.time - startTime;
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Vector2 pointerLocalPosition;
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var viewRect = (RectTransform)transform;
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RectTransformUtility.ScreenPointToLocalPointInRectangle(viewRect, eventData.position, eventData.pressEventCamera, out pointerLocalPosition);
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var positionDelta = pointerLocalPosition - startLocalPosition;
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var isDragOnAxis = Mathf.Abs(positionDelta.normalized[(int)swipeAxis]) > 0.5f;
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var isValidGestureDuration = duration < gestureMaxDuration;
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var size = swipeAxis == Axis.Horizontal ? viewRect.rect.width : viewRect.rect.height;
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var movementOverAxis = Mathf.Abs(positionDelta[(int)swipeAxis]);
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var minRequiredTravelDistance = size * gestureMinDistanceNormalized;
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var isProperSwipeDistance = movementOverAxis > minRequiredTravelDistance;
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if (isDragOnAxis && isProperSwipeDistance && isValidGestureDuration)
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{
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var direction = (int)Mathf.Sign(positionDelta[(int)swipeAxis]);
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direction *= invertScroll ? -1 : 1;
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swipeExecuted.Invoke(direction);
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}
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}
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}
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