HeavenStudioPlus/Assets/Plugins/com.unity.uiextensions/Runtime/Scripts/Utilities/ScrollConflictManager.cs

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2022-01-06 00:11:33 +00:00
/// Credit srinivas sunil
/// sourced from: https://bitbucket.org/SimonDarksideJ/unity-ui-extensions/pull-requests/21/develop_53/diff
/// Updated by Hiep Eldest : https://bitbucket.org/UnityUIExtensions/unity-ui-extensions/issues/300/scrollconflictmanager-not-working-if
using UnityEngine.EventSystems;
/// <summary>
/// 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
/// Attach the script to the rect scroll and assign other rectscroll in the inspector (one is vertical and other is horizontal) gathered and modified from unity answers(delta snipper)
/// </summary>
namespace UnityEngine.UI.Extensions
{
[RequireComponent(typeof(ScrollRect))]
[AddComponentMenu("UI/Extensions/Scrollrect Conflict Manager")]
public class ScrollConflictManager : MonoBehaviour, IBeginDragHandler, IEndDragHandler, IDragHandler
{
[Tooltip("The parent ScrollRect control hosting this ScrollSnap")]
public ScrollRect ParentScrollRect;
[Tooltip("The parent ScrollSnap control hosting this Scroll Snap.\nIf left empty, it will use the ScrollSnap of the ParentScrollRect")]
private ScrollSnapBase ParentScrollSnap;
private ScrollRect _myScrollRect;
private IBeginDragHandler[] _beginDragHandlers;
private IEndDragHandler[] _endDragHandlers;
private IDragHandler[] _dragHandlers;
//This tracks if the other one should be scrolling instead of the current one.
private bool scrollOther;
//This tracks whether the other one should scroll horizontally or vertically.
private bool scrollOtherHorizontally;
void Awake()
{
if (ParentScrollRect)
{
InitialiseConflictManager();
}
}
private void InitialiseConflictManager()
{
//Get the current scroll rect so we can disable it if the other one is scrolling
_myScrollRect = this.GetComponent<ScrollRect>();
//If the current scroll Rect has the vertical checked then the other one will be scrolling horizontally.
scrollOtherHorizontally = _myScrollRect.vertical;
//Check some attributes to let the user know if this wont work as expected
if (scrollOtherHorizontally)
{
if (_myScrollRect.horizontal)
Debug.LogError("You have added the SecondScrollRect to a scroll view that already has both directions selected");
if (!ParentScrollRect.horizontal)
Debug.LogError("The other scroll rect does not support scrolling horizontally");
}
else if (!ParentScrollRect.vertical)
{
Debug.LogError("The other scroll rect does not support scrolling vertically");
}
if (ParentScrollRect && !ParentScrollSnap)
{
ParentScrollSnap = ParentScrollRect.GetComponent<ScrollSnapBase>();
}
}
void Start()
{
if (ParentScrollRect)
{
AssignScrollRectHandlers();
}
}
private void AssignScrollRectHandlers()
{
_beginDragHandlers = ParentScrollRect.GetComponents<IBeginDragHandler>();
_dragHandlers = ParentScrollRect.GetComponents<IDragHandler>();
_endDragHandlers = ParentScrollRect.GetComponents<IEndDragHandler>();
}
public void SetParentScrollRect(ScrollRect parentScrollRect)
{
ParentScrollRect = parentScrollRect;
InitialiseConflictManager();
AssignScrollRectHandlers();
}
#region DragHandler
public void OnBeginDrag(PointerEventData eventData)
{
//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
float horizontal = Mathf.Abs(eventData.position.x - eventData.pressPosition.x);
float vertical = Mathf.Abs(eventData.position.y - eventData.pressPosition.y);
if (scrollOtherHorizontally)
{
if (horizontal > vertical)
{
scrollOther = true;
//disable the current scroll rect so it does not move.
_myScrollRect.enabled = false;
for (int i = 0, length = _beginDragHandlers.Length; i < length; i++)
{
_beginDragHandlers[i].OnBeginDrag(eventData);
if(ParentScrollSnap) ParentScrollSnap.OnBeginDrag(eventData);
}
}
}
else if (vertical > horizontal)
{
scrollOther = true;
//disable the current scroll rect so it does not move.
_myScrollRect.enabled = false;
for (int i = 0, length = _beginDragHandlers.Length; i < length; i++)
{
_beginDragHandlers[i].OnBeginDrag(eventData);
if (ParentScrollSnap) ParentScrollSnap.OnBeginDrag(eventData);
}
}
}
public void OnEndDrag(PointerEventData eventData)
{
if (scrollOther)
{
_myScrollRect.enabled = true;
scrollOther = false;
for (int i = 0, length = _endDragHandlers.Length; i < length; i++)
{
_endDragHandlers[i].OnEndDrag(eventData);
if (ParentScrollSnap) ParentScrollSnap.OnEndDrag(eventData);
}
}
}
public void OnDrag(PointerEventData eventData)
{
if (scrollOther)
{
for (int i = 0, length = _endDragHandlers.Length; i < length; i++)
{
_dragHandlers[i].OnDrag(eventData);
if (ParentScrollSnap) ParentScrollSnap.OnDrag(eventData);
}
}
}
#endregion DragHandler
}
}