Replay client (#15001)

Content.Client/Replay/UI/Loading/LoadingScreen.cs

@@ -0,0 +1,51 @@
+using Robust.Client.ResourceManagement;
+using Robust.Client.State;
+using Robust.Client.UserInterface;
+using Robust.Shared.CPUJob.JobQueues;
+using Robust.Shared.Timing;
+
+namespace Content.Client.Replay.UI.Loading;
+
+[Virtual]
+public class LoadingScreen<TResult> : State
+{
+    [Dependency] private readonly IResourceCache _resourceCache = default!;
+    [Dependency] private readonly IUserInterfaceManager _userInterfaceManager = default!;
+
+    public event Action<TResult?, Exception?>? OnJobFinished;
+    private LoadingScreenControl _screen = default!;
+    public Job<TResult>? Job;
+
+    public override void FrameUpdate(FrameEventArgs e)
+    {
+        base.FrameUpdate(e);
+        if (Job == null)
+            return;
+
+        Job.Run();
+        if (Job.Status != JobStatus.Finished)
+            return;
+
+        OnJobFinished?.Invoke(Job.Result, Job.Exception);
+        Job = null;
+    }
+
+    protected override void Startup()
+    {
+        _screen = new(_resourceCache);
+        _userInterfaceManager.StateRoot.AddChild(_screen);
+    }
+
+    protected override void Shutdown()
+    {
+        _screen.Dispose();
+    }
+
+    public void UpdateProgress(float value, float maxValue, string header, string subtext = "")
+    {
+        _screen.Bar.Value = value;
+        _screen.Bar.MaxValue = maxValue;
+        _screen.Header.Text = header;
+        _screen.Subtext.Text = subtext;
+    }
+}