94 lines
2.5 KiB
C#
94 lines
2.5 KiB
C#
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using UnityEngine;
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using UnityEngine.EventSystems;
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using UnityEngine.UI;
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namespace RoR2.UI;
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[RequireComponent(typeof(RectTransform))]
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[RequireComponent(typeof(LayoutElement))]
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[ExecuteAlways]
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public class ColumnLayoutGroupElement : MonoBehaviour, IBeginDragHandler, IEventSystemHandler, IDragHandler
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{
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private enum ClickLocation
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{
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None,
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Middle,
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RightHandle,
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LeftHandle
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}
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private RectTransform rectTransform;
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private LayoutElement layoutElement;
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public RectTransform rectTransformToLayoutInvalidate;
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private float handleWidth = 4f;
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private ClickLocation lastClickLocation;
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private void Awake()
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{
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rectTransform = (RectTransform)base.transform;
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layoutElement = GetComponent<LayoutElement>();
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}
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public void OnBeginDrag(PointerEventData eventData)
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{
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ClickLocation clickLocation = ClickLocation.None;
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if (RectTransformUtility.ScreenPointToLocalPointInRectangle(rectTransform, eventData.position, eventData.pressEventCamera, out var localPoint))
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{
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Rect rect = rectTransform.rect;
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float width = rect.width;
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Vector2 vector = new Vector2(localPoint.x * rect.width, localPoint.y * rect.height);
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clickLocation = ClickLocation.Middle;
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if (vector.x < handleWidth)
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{
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clickLocation = ClickLocation.LeftHandle;
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}
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if (vector.x > width - handleWidth)
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{
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clickLocation = ClickLocation.RightHandle;
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}
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}
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lastClickLocation = clickLocation;
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}
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public void OnDrag(PointerEventData eventData)
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{
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Transform parent = rectTransform.parent;
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int siblingIndex = rectTransform.GetSiblingIndex();
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if (lastClickLocation == ClickLocation.LeftHandle && siblingIndex != 0)
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{
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AdjustWidth(parent.GetChild(siblingIndex - 1)?.GetComponent<LayoutElement>(), layoutElement, eventData.delta.x);
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}
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if (lastClickLocation == ClickLocation.RightHandle && siblingIndex != parent.childCount - 1)
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{
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AdjustWidth(layoutElement, parent.GetChild(siblingIndex + 1)?.GetComponent<LayoutElement>(), eventData.delta.x);
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}
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void AdjustWidth(LayoutElement lhs, LayoutElement rhs, float change)
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{
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if ((bool)lhs && (bool)rhs)
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{
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if (lhs.preferredWidth + change < lhs.minWidth)
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{
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change = lhs.minWidth - lhs.preferredWidth;
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}
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if (rhs.preferredWidth - change < rhs.minWidth)
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{
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change = rhs.preferredWidth - rhs.minWidth;
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}
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if (change != 0f)
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{
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lhs.preferredWidth += change;
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rhs.preferredWidth -= change;
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if ((bool)rectTransformToLayoutInvalidate)
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{
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LayoutRebuilder.MarkLayoutForRebuild(rectTransformToLayoutInvalidate);
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}
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}
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}
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}
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}
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}
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