sbox-public/game/addons/tools/Code/Scene/SceneTree/SceneNode.cs

namespace Editor;

partial class SceneNode : GameObjectNode
{
	public SceneNode( Scene scene ) : base( scene )
	{

	}

	public override bool HasChildren => Value.Children.Where( x => x.ShouldShowInHierarchy() ).Any();

	protected override void BuildChildren() => SetChildren( Value.Children.Where( x => x.ShouldShowInHierarchy() ), x => new GameObjectNode( x ) );
	protected override bool HasDescendant( object obj ) => obj is GameObject go && Value.IsDescendant( go );

	public override void OnPaint( VirtualWidget item )
	{
		var isEven = item.Row % 2 == 0;
		var fullSpanRect = item.Rect;
		fullSpanRect.Left = 0;
		fullSpanRect.Right = TreeView.Width;

		if ( item.Selected )
		{
			Paint.ClearPen();
			Paint.SetBrush( Theme.Blue.WithAlpha( 0.4f ) );
			Paint.DrawRect( fullSpanRect );

			Paint.SetPen( Theme.TextControl );
		}
		else if ( isEven )
		{
			Paint.ClearPen();
			Paint.SetBrush( Theme.SurfaceLightBackground.WithAlpha( 0.1f ) );
			Paint.DrawRect( fullSpanRect );
		}

		var r = item.Rect;
		Paint.SetPen( Theme.TextControl.WithAlpha( 0.4f ) );

		r.Left += 4;
		Paint.DrawIcon( r, "perm_media", 14, TextFlag.LeftCenter );
		r.Left += 22;
		Paint.SetDefaultFont();
		Paint.DrawText( r, $"{Value.Name}", TextFlag.LeftCenter );
	}

	public override int ValueHash
	{
		get
		{
			if ( Value?.Children is null )
				return 0;

			HashCode hc = new HashCode();

			foreach ( var val in Value.Children )
			{
				if ( !val.ShouldShowInHierarchy() ) continue;
				hc.Add( val );
			}

			return hc.ToHashCode();
		}
	}

	public override bool OnContextMenu()
	{
		var m = new ContextMenu( TreeView );

		m.AddSeparator();

		GameObjectNode.AddGameObjectMenuItems( m, this );

		m.OpenAtCursor( false );

		return true;
	}

	public override bool OnDragStart()
	{
		return false;
	}
}