Can't select button in ScrollArea when moving from ScrollBar to button with mouse button pressed

Questions & Answers
1

So I have a row of buttons in a ScrollArea with a ScrollBar beneath it like that:
83784-unity-2016-12-10-17-57-42.png

Everything works fine when I press the left mouse button, move the scroll bar, release the button and move my mouse over one of the buttons.

But when I press the left mouse button on the scrollbar and then move my mouse over a button and release it, the button won’t get hovered until I either release and press the button again or hover a different ui object.

I guess this is because Unity keeps the ScrollBar focused when I move my mouse out of the ScrollBars area to keep it moveabe but fails to reset the focus in this case somehow. Any idea on how to fix that?

2

Found a workaround!

using UnityEngine;
using System.Collections;
using UnityEngine.UI;
using UnityEngine.EventSystems;
using System;
using System.Collections.Generic;

public class ScrollbarWithFix : Scrollbar, IEndDragHandler
{

    public void OnEndDrag(PointerEventData eventData)
    {


        GraphicRaycaster graphicsRaycaster = this.GetComponentInParent<GraphicRaycaster>();
        PointerEventData pointerEventData = new PointerEventData(null);
        pointerEventData.position = Input.mousePosition;
        List<RaycastResult> results = new List<RaycastResult>();
        graphicsRaycaster.Raycast(pointerEventData, results);

        foreach(RaycastResult result in results)
        {
            Selectable sel = result.gameObject.GetComponent<Selectable>();
            if(sel != null)
            {
                sel.OnPointerEnter(new PointerEventData(EventSystem.current));
            }
            
        }
    }
}