@using Sandbox;
@using Sandbox.UI;
@inherits PanelComponent
@namespace Sandbox

<root>
    @foreach ( var item in items )
    {
        bool active = item.Active;
        string clss = active ? "uncollected" : "";

        <div class="icon @clss">@item.Icon</div>
    }
</root>

@code
{

    public string Icon { get; set; }
    public string Tooltip { get; set; }

    CollectableItem[] items;

    /// <summary>
    /// the hash determines if the system should be rebuilt. If it changes, it will be rebuilt
    /// </summary>
    protected override int BuildHash() => System.HashCode.Combine(items.Count( x => x.Active ));

    protected override void OnEnabled()
    {
        items = Scene.Components.GetAll<CollectableItem>( FindMode.EverythingInSelfAndDescendants ).ToArray();
    }

    protected override void OnUpdate()
    {
        base.OnUpdate();

        SetClass("complete", items.All( x => !x.Active ) );
    }
}