42 lines
1.4 KiB
C#
42 lines
1.4 KiB
C#
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using UnityEngine;
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using UnityEngine.EventSystems;
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namespace QFSW.QC.UI
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{
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[DisallowMultipleComponent]
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public class ResizableUI : MonoBehaviour, IDragHandler
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{
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[SerializeField] private RectTransform _resizeRoot = null;
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[SerializeField] private Canvas _resizeCanvas = null;
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[SerializeField] private bool _lockInScreen = true;
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[SerializeField] private Vector2 _minSize = new Vector2();
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public void OnDrag(PointerEventData eventData)
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{
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Vector2 minBounds = (_resizeRoot.offsetMin + _minSize) * _resizeCanvas.scaleFactor;
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Vector2 maxBounds = _lockInScreen
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? new Vector2(Screen.width, Screen.height)
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: new Vector2(Mathf.Infinity, Mathf.Infinity);
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Vector2 delta = eventData.delta;
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Vector2 posCurrent = eventData.position;
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Vector2 posLast = posCurrent - delta;
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Vector2 posCurrentBounded = new Vector2(
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Mathf.Clamp(posCurrent.x, minBounds.x, maxBounds.x),
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Mathf.Clamp(posCurrent.y, minBounds.y, maxBounds.y)
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);
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Vector2 posLastBounded = new Vector2(
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Mathf.Clamp(posLast.x, minBounds.x, maxBounds.x),
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Mathf.Clamp(posLast.y, minBounds.y, maxBounds.y)
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);
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Vector2 deltaBounded = posCurrentBounded - posLastBounded;
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_resizeRoot.offsetMax += deltaBounded / _resizeCanvas.scaleFactor;
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}
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}
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}
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