Pushing currently broken code.

PcgsInvUi/ViewModels/ApiKeyViewModel.cs

@@ -0,0 +1,30 @@
+using ReactiveUI;
+using System.Reactive;
+
+namespace PcgsInvUi.ViewModels;
+
+public class ApiKeyViewModel : ViewModelBase {
+    public string ApiKeyInput {
+        get => _apiKeyInput;
+        set => this.RaiseAndSetIfChanged(ref _apiKeyInput, value);
+    }
+    private string _apiKeyInput = "";
+
+    public bool OkEnabled {
+        get => _okEnabled;
+        set => this.RaiseAndSetIfChanged(ref _okEnabled, value);
+    }
+    private bool _okEnabled;
+
+    public ReactiveCommand<Unit, string> OkCommand { get; }
+
+    public ApiKeyViewModel() {
+        var okEnabled = this.WhenAnyValue(
+            x => x.ApiKeyInput,
+            x => !string.IsNullOrWhiteSpace(x));
+
+
+        // Get the API key from the user.
+        OkCommand = ReactiveCommand.Create(() => ApiKeyInput, okEnabled);
+    }
+}