54 lines
1.4 KiB
C#
54 lines
1.4 KiB
C#
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#if UNITY_EDITOR
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using UnityEngine.UIElements;
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using System.Collections.Generic;
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namespace GSpawn
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{
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public class TreeViewItemPool<TItem, TItemData> : VisualElement
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where TItem : TreeViewItem<TItemData>, new()
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where TItemData : IUIItemStateProvider
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{
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private ITreeView _treeView;
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private List<TItem> _freeItems = new List<TItem>();
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public static string newItemTag { get { return "TreeViewItemPool.NewItem"; } }
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public TreeViewItemPool(ITreeView treeView)
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{
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_treeView = treeView;
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}
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public void releaseItem(TItem item)
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{
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_freeItems.Add(item);
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item.onWillBeDetachedFromTreeView();
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item.removeTag(newItemTag);
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}
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public TItem obtainItem(TItemData itemData)
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{
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TItem item = default(TItem);
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if (_freeItems.Count == 0)
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{
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item = new TItem();
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item.initialize(_treeView, itemData);
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item.buildUI();
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_freeItems.Add(item);
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item.addTag(newItemTag);
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}
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item = _freeItems[_freeItems.Count - 1];
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_freeItems.RemoveAt(_freeItems.Count - 1);
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item.parentItem = null;
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item.data = itemData;
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item.setVisible(true);
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item.setExpanded(true, false);
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return item;
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}
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}
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}
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#endif
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