com.alicizax.unity.packagemanager/Editor/PackageManager/Window/PackageBottomStateBar.cs

using UnityEditor;
using UnityEngine;
using UnityEngine.UIElements;

namespace AlicizaX.PackageManager.Editor
{
    internal class PackageBottomStateBar : VisualElement
    {
        private readonly Label stateLabel;
        private readonly Button btnRefresh;

        public PackageBottomStateBar()
        {
            style.flexDirection = FlexDirection.Row;
            style.flexShrink = 1;
            style.justifyContent = Justify.FlexStart;
            style.height = Length.Percent(5);
            style.backgroundColor = new Color(0.2509804f, 0.2509804f, 0.2509804f);
            style.borderTopWidth = 1;

            stateLabel = new Label();
            stateLabel.name = "stateLabel";

            stateLabel.text = EditorPrefs.GetString("PackageUpdateDate", "");
            stateLabel.style.alignSelf = Align.Center;
            stateLabel.style.marginLeft = new Length(2, LengthUnit.Pixel);
            stateLabel.style.flexGrow = 1; // 让 Label 占据剩余空间
            Add(stateLabel);

            btnRefresh = new Button(OnBtnRefreshClick);
            btnRefresh.name = "btnRefresh";
            btnRefresh.style.maxHeight = 30;

            Image icon = new Image();
            icon.image = EditorGUIUtility.IconContent("d_Refresh").image;
            btnRefresh.Add(icon);
            Add(btnRefresh);
        }

        private void OnBtnRefreshClick()
        {
            UpdateAllPackageHelper.UpdatePackages();
        }
    }
}