unity ドラッグできるウィンドウ

DragWindow.cs

//public domain(著作権破棄) ご自由にお使いください
// 説明ページはこちら↓
// http://www.unitygamebox.com/entry/2019/11/27/%E3%80%90unity%E3%80%91%E3%83%89%E3%83%A9%E3%83%83%E3%82%B0/%E7%B8%AE%E5%B0%8F/%E6%9C%80%E5%A4%A7%E5%8C%96%E3%81%A7%E3%81%8D%E3%82%8B%E3%82%A6%E3%82%A3%E3%83%B3%E3%83%89%E3%82%A6%E3%80%90%E3%82%B9
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.EventSystems;
using System;
using System.Collections;

/// <summary>
/// 
/// </summary>
namespace DragWindow
{
	[Serializable]
	public partial class DragWindow : MonoBehaviour,IPointerDownHandler
	{
		[NonSerialized] public RectTransform rect;
		[SerializeField] public Vector2 minSize = new Vector2(300, 30);
		[SerializeField] public Vector2 maxSize = new Vector2(400, 300);
		[SerializeField] public Vector2 MinimizeMaximizePivot = new Vector2(1, 1);

		void Awake()
		{
			rect = GetComponent<RectTransform>();
		}

		/// <summary>
		/// ウィンドウを最小化
		/// </summary>
		public void OnButtonMinimize()
		{
			var diff = rect.sizeDelta - minSize;
			Vector3 pos = rect.anchoredPosition;
			pos.x += diff.x * (MinimizeMaximizePivot.x - rect.pivot.x);
			pos.y += diff.y * (MinimizeMaximizePivot.y - rect.pivot.y);
			rect.anchoredPosition = pos;

			rect.sizeDelta = minSize;
		}

		/// <summary>
		/// ウィンドウ最大化
		/// </summary>
		public void OnButtonMaximize()
		{
			var diff = rect.sizeDelta - maxSize;
			Vector3 pos = rect.anchoredPosition;
			pos.x += diff.x * (MinimizeMaximizePivot.x - rect.pivot.x);
			pos.y += diff.y * (MinimizeMaximizePivot.y - rect.pivot.y);
			rect.anchoredPosition = pos;

			rect.sizeDelta = maxSize;
		}

		/// <summary>
		/// ウィンドウをクリックすると最前面にUIを表示する
		/// </summary>
		public void OnPointerDown(PointerEventData e)
		{
			rect.SetAsLastSibling();
		}

	}
}   //namespace:DragWindow