109 lines
3.7 KiB
C#
109 lines
3.7 KiB
C#
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/// Credit CaptainSchnittchen
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/// Credit TouchPad (OnScroll function) update - GamesRUs
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/// sourced from: http://forum.unity3d.com/threads/scripts-useful-4-6-scripts-collection.264161/page-2#post-2011648
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/*USAGE:
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Simply place the script on the ScrollRect that contains the selectable children we'll be scrolling to
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and drag'n'drop the RectTransform of the options "container" that we'll be scrolling.*/
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using System;
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using UnityEngine.EventSystems;
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namespace UnityEngine.UI.Extensions
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{
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[AddComponentMenu("UI/Extensions/ScrollRectEx")]
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public class ScrollRectEx : ScrollRect
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{
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private bool routeToParent = false;
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/// <summary>
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/// Do action for all parents
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/// </summary>
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private void DoForParents<T>(Action<T> action) where T : IEventSystemHandler
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{
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Transform parent = transform.parent;
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while (parent != null)
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{
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foreach (var component in parent.GetComponents<Component>())
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{
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if (component is T)
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action((T)(IEventSystemHandler)component);
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}
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parent = parent.parent;
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}
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}
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/// <summary>
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/// Always route initialize potential drag event to parents
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/// </summary>
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public override void OnInitializePotentialDrag(PointerEventData eventData)
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{
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DoForParents<IInitializePotentialDragHandler>((parent) => { parent.OnInitializePotentialDrag(eventData); });
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base.OnInitializePotentialDrag(eventData);
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}
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/// <summary>
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/// Drag event
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/// </summary>
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public override void OnDrag(UnityEngine.EventSystems.PointerEventData eventData)
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{
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if (routeToParent)
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DoForParents<IDragHandler>((parent) => { parent.OnDrag(eventData); });
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else
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base.OnDrag(eventData);
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}
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/// <summary>
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/// Begin drag event
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/// </summary>
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public override void OnBeginDrag(UnityEngine.EventSystems.PointerEventData eventData)
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{
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if (!horizontal && Math.Abs(eventData.delta.x) > Math.Abs(eventData.delta.y))
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routeToParent = true;
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else if (!vertical && Math.Abs(eventData.delta.x) < Math.Abs(eventData.delta.y))
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routeToParent = true;
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else
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routeToParent = false;
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if (routeToParent)
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DoForParents<IBeginDragHandler>((parent) => { parent.OnBeginDrag(eventData); });
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else
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base.OnBeginDrag(eventData);
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}
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/// <summary>
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/// End drag event
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/// </summary>
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public override void OnEndDrag(UnityEngine.EventSystems.PointerEventData eventData)
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{
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if (routeToParent)
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DoForParents<IEndDragHandler>((parent) => { parent.OnEndDrag(eventData); });
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else
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base.OnEndDrag(eventData);
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routeToParent = false;
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}
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public override void OnScroll(PointerEventData eventData)
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{
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if (!horizontal && Math.Abs(eventData.scrollDelta.x) > Math.Abs(eventData.scrollDelta.y))
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{
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routeToParent = true;
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}
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else if (!vertical && Math.Abs(eventData.scrollDelta.x) < Math.Abs(eventData.scrollDelta.y))
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{
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routeToParent = true;
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}
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else
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{
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routeToParent = false;
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}
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if (routeToParent)
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DoForParents<IScrollHandler>((parent) => {
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parent.OnScroll(eventData);
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});
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else
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base.OnScroll(eventData);
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}
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}
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}
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