tbd-station-14/Content.Client/GameObjects/Components/Atmos/GasAnalyzerComponent.cs

using Content.Client.UserInterface.Stylesheets;
using Content.Client.Utility;
using Content.Shared.GameObjects.Components;
using Robust.Client.UserInterface;
using Robust.Client.UserInterface.Controls;
using Robust.Shared.GameObjects;
using Robust.Shared.Localization;
using Robust.Shared.Timing;
using Robust.Shared.ViewVariables;

namespace Content.Client.GameObjects.Components.Atmos
{
    [RegisterComponent]
    internal class GasAnalyzerComponent : SharedGasAnalyzerComponent, IItemStatus
    {
        [ViewVariables(VVAccess.ReadWrite)] private bool _uiUpdateNeeded;
        [ViewVariables] public GasAnalyzerDanger Danger { get; private set; }

        Control IItemStatus.MakeControl()
        {
            return new StatusControl(this);
        }

        public override void HandleComponentState(ComponentState? curState, ComponentState? nextState)
        {
            if (curState is not GasAnalyzerComponentState state)
                return;

            Danger = state.Danger;
            _uiUpdateNeeded = true;
        }

        private sealed class StatusControl : Control
        {
            private readonly GasAnalyzerComponent _parent;
            private readonly RichTextLabel _label;

            public StatusControl(GasAnalyzerComponent parent)
            {
                _parent = parent;
                _label = new RichTextLabel { StyleClasses = { StyleNano.StyleClassItemStatus } };
                AddChild(_label);

                parent._uiUpdateNeeded = true;
            }

            protected override void Update(FrameEventArgs args)
            {
                base.Update(args);

                if (!_parent._uiUpdateNeeded)
                {
                    return;
                }

                _parent._uiUpdateNeeded = false;

                var color = _parent.Danger switch
                {
                    GasAnalyzerDanger.Warning => "orange",
                    GasAnalyzerDanger.Hazard => "red",
                    _ => "green",
                };

                _label.SetMarkup(Loc.GetString("Pressure: [color={0}]{1}[/color]",
                    color,
                   _parent.Danger));
            }
        }
    }
}