126 lines
5.5 KiB
C#
126 lines
5.5 KiB
C#
/// Credit srinivas sunil
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/// sourced from: https://bitbucket.org/ddreaper/unity-ui-extensions/pull-requests/21/develop_53/diff
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/// Updated by Hiep Eldest : https://bitbucket.org/UnityUIExtensions/unity-ui-extensions/issues/300/scrollconflictmanager-not-working-if
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using UnityEngine.EventSystems;
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/// <summary>
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/// This is the most efficient way to handle scroll conflicts when there are multiple scroll rects, this is useful when there is a vertical scrollrect in/on a horizontal scrollrect or vice versa
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/// Attach the script to the rect scroll and assign other rectscroll in the inspecter (one is verticle and other is horizontal) gathered and modified from unity answers(delta snipper)
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/// </summary>
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namespace UnityEngine.UI.Extensions
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{
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[RequireComponent(typeof(ScrollRect))]
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[AddComponentMenu("UI/Extensions/Scrollrect Conflict Manager")]
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public class ScrollConflictManager : MonoBehaviour, IBeginDragHandler, IEndDragHandler, IDragHandler
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{
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[Tooltip("The parent ScrollRect control hosting this ScrollSnap")]
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public ScrollRect ParentScrollRect;
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[Tooltip("The parent ScrollSnap control hosting this Scroll Snap.\nIf left empty, it will use the ScrollSnap of the ParentScrollRect")]
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public ScrollSnapBase ParentScrollSnap;
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private ScrollRect _myScrollRect;
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private IBeginDragHandler[] _beginDragHandlers;
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private IEndDragHandler[] _endDragHandlers;
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private IDragHandler[] _dragHandlers;
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//This tracks if the other one should be scrolling instead of the current one.
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private bool scrollOther;
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//This tracks wether the other one should scroll horizontally or vertically.
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private bool scrollOtherHorizontally;
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void Awake()
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{
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//Get the current scroll rect so we can disable it if the other one is scrolling
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_myScrollRect = this.GetComponent<ScrollRect>();
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//If the current scroll Rect has the vertical checked then the other one will be scrolling horizontally.
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scrollOtherHorizontally = _myScrollRect.vertical;
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//Check some attributes to let the user know if this wont work as expected
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if (scrollOtherHorizontally)
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{
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if (_myScrollRect.horizontal)
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Debug.LogError("You have added the SecondScrollRect to a scroll view that already has both directions selected");
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if (!ParentScrollRect.horizontal)
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Debug.LogError("The other scroll rect doesnt support scrolling horizontally");
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}
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else if (!ParentScrollRect.vertical)
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{
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Debug.LogError("The other scroll rect doesnt support scrolling vertically");
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}
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if (ParentScrollRect && !ParentScrollSnap)
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{
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ParentScrollSnap = ParentScrollRect.GetComponent<ScrollSnapBase>();
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}
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}
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void Start()
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{
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_beginDragHandlers = ParentScrollRect.GetComponents<IBeginDragHandler>();
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_dragHandlers = ParentScrollRect.GetComponents<IDragHandler>();
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_endDragHandlers = ParentScrollRect.GetComponents<IEndDragHandler>();
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}
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#region DragHandler
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public void OnBeginDrag(PointerEventData eventData)
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{
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//Get the absolute values of the x and y differences so we can see which one is bigger and scroll the other scroll rect accordingly
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float horizontal = Mathf.Abs(eventData.position.x - eventData.pressPosition.x);
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float vertical = Mathf.Abs(eventData.position.y - eventData.pressPosition.y);
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if (scrollOtherHorizontally)
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{
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if (horizontal > vertical)
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{
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scrollOther = true;
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//disable the current scroll rect so it doesnt move.
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_myScrollRect.enabled = false;
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for (int i = 0, length = _beginDragHandlers.Length; i < length; i++)
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{
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_beginDragHandlers[i].OnBeginDrag(eventData);
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if(ParentScrollSnap) ParentScrollSnap.OnBeginDrag(eventData);
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}
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}
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}
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else if (vertical > horizontal)
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{
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scrollOther = true;
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//disable the current scroll rect so it doesnt move.
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_myScrollRect.enabled = false;
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for (int i = 0, length = _beginDragHandlers.Length; i < length; i++)
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{
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_beginDragHandlers[i].OnBeginDrag(eventData);
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if (ParentScrollSnap) ParentScrollSnap.OnBeginDrag(eventData);
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}
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}
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}
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public void OnEndDrag(PointerEventData eventData)
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{
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if (scrollOther)
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{
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_myScrollRect.enabled = true;
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scrollOther = false;
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for (int i = 0, length = _endDragHandlers.Length; i < length; i++)
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{
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_endDragHandlers[i].OnEndDrag(eventData);
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if (ParentScrollSnap) ParentScrollSnap.OnEndDrag(eventData);
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}
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}
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}
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public void OnDrag(PointerEventData eventData)
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{
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if (scrollOther)
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{
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for (int i = 0, length = _endDragHandlers.Length; i < length; i++)
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{
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_dragHandlers[i].OnDrag(eventData);
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if (ParentScrollSnap) ParentScrollSnap.OnDrag(eventData);
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}
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}
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}
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#endregion DragHandler
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}
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} |