94 lines
3.1 KiB
C#
94 lines
3.1 KiB
C#
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using UnityEngine;
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using UnityEngine.EventSystems;
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using static UnityEngine.EventSystems.ExecuteEvents;
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namespace kamgam
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{
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/// <summary>
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/// Bubbles events to the parent. Use this to overcome EventTriggers which stop scroll and drag events from bubbling.
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///
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/// If an EventTrigger component is attached and other code is listening for
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/// onPointer events then these will NOT be triggered while dragging if DisableEventTriggerWhileDragging
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/// is true.
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/// </summary>
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public class UiScrollRectEventBubbling : MonoBehaviour,
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IBeginDragHandler,
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IDragHandler,
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IEndDragHandler,
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IScrollHandler
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{
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[Tooltip("Should the scroll and drag events be forwarded (bubble up) to the parent?")]
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public bool Bubble = true;
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[Tooltip("Stop EventTriggers from executing events while dragging?")]
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public bool DisableEventTriggerWhileDragging = true;
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protected EventTrigger eventTrigger;
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public EventTrigger EventTrigger
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{
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get
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{
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if (eventTrigger == null)
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{
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eventTrigger = this.GetComponent<EventTrigger>();
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}
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return eventTrigger;
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}
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}
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protected bool dragging = false;
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protected void HandleEventPropagation<T>(Transform goTransform, BaseEventData eventData, EventFunction<T> callbackFunction) where T : IEventSystemHandler
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{
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if (Bubble && goTransform.parent != null)
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{
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ExecuteEvents.ExecuteHierarchy(goTransform.parent.gameObject, eventData, callbackFunction);
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}
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}
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public void OnScroll(PointerEventData eventData)
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{
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HandleEventPropagation(transform, eventData, ExecuteEvents.scrollHandler);
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}
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public void OnBeginDrag(PointerEventData eventData)
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{
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HandleEventPropagation(transform, eventData, ExecuteEvents.beginDragHandler);
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dragging = true;
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if (DisableEventTriggerWhileDragging && EventTrigger != null)
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{
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EventTrigger.enabled = false;
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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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HandleEventPropagation(transform, eventData, ExecuteEvents.dragHandler);
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}
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public void OnEndDrag(PointerEventData eventData)
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{
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HandleEventPropagation(transform, eventData, ExecuteEvents.endDragHandler);
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dragging = false;
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if (DisableEventTriggerWhileDragging && EventTrigger != null)
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{
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EventTrigger.enabled = true;
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}
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}
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/// <summary>
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/// If the object is disabled while being dragged then the EventTrigger would remain disabled.
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/// </summary>
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public void OnDisable()
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{
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if (DisableEventTriggerWhileDragging && dragging && EventTrigger != null)
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{
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dragging = false;
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EventTrigger.enabled = true;
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}
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}
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}
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}
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