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Fix performance lag caused by scrollbar value set invoke #50

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19 changes: 17 additions & 2 deletions Assets/FancyScrollView/Sources/Runtime/Scroller/Scroller.cs
Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,7 @@
using UnityEngine.EventSystems;
using UnityEngine.UI;
using EasingCore;
using UnityEngine.Events;

namespace FancyScrollView
{
Expand Down Expand Up @@ -141,6 +142,11 @@ public float Position
UpdatePosition(value);
}
}

/// <summary>
/// Scrollbar onValueChangedAction
/// </summary>
private UnityAction<float> scrollbarOnValueChangedAction;

readonly AutoScrollState autoScrollState = new AutoScrollState();

Expand Down Expand Up @@ -205,7 +211,7 @@ protected override void Start()

if (scrollbar)
{
scrollbar.onValueChanged.AddListener(x => UpdatePosition(x * (totalCount - 1f), false));
scrollbarOnValueChangedAction = x => UpdatePosition(x * (totalCount - 1f), false);
}
}

Expand Down Expand Up @@ -472,9 +478,18 @@ void UpdatePosition(float position, bool updateScrollbar = true)
{
onValueChanged?.Invoke(currentPosition = position);

if (scrollbar && updateScrollbar)
if (!scrollbar)
{
return;
}

// If 'updateScrollbar' equals 'true' means this method is called by 'Scroller', otherwise from the
// scrollbar drag invoke
if (updateScrollbar)
{
scrollbar.onValueChanged.RemoveListener(scrollbarOnValueChangedAction);
scrollbar.value = Mathf.Clamp01(position / Mathf.Max(totalCount - 1f, 1e-4f));
scrollbar.onValueChanged.AddListener(scrollbarOnValueChangedAction);
}
}

Expand Down