feat(configmanager): add MVVM base classes

2026-01-19 17:34:53 -05:00
parent c055bc6c78
commit 0e1bb6aa35
3 changed files with 111 additions and 0 deletions
@@ -0,0 +1,48 @@
+using System.Windows.Input;
+
+namespace JdeScoping.ConfigManager.ViewModels;
+
+/// <summary>
+/// An async command implementation that properly handles async operations.
+/// </summary>
+public class AsyncRelayCommand : ICommand
+{
+    private readonly Func<Task> _execute;
+    private readonly Func<bool>? _canExecute;
+    private bool _isExecuting;
+    private EventHandler? _canExecuteChanged;
+
+    public event EventHandler? CanExecuteChanged
+    {
+        add => _canExecuteChanged += value;
+        remove => _canExecuteChanged -= value;
+    }
+
+    public AsyncRelayCommand(Func<Task> execute, Func<bool>? canExecute = null)
+    {
+        _execute = execute ?? throw new ArgumentNullException(nameof(execute));
+        _canExecute = canExecute;
+    }
+
+    public bool CanExecute(object? parameter) => !_isExecuting && (_canExecute?.Invoke() ?? true);
+
+    public async void Execute(object? parameter)
+    {
+        if (!CanExecute(parameter)) return;
+
+        _isExecuting = true;
+        RaiseCanExecuteChanged();
+
+        try
+        {
+            await _execute();
+        }
+        finally
+        {
+            _isExecuting = false;
+            RaiseCanExecuteChanged();
+        }
+    }
+
+    public void RaiseCanExecuteChanged() => _canExecuteChanged?.Invoke(this, EventArgs.Empty);
+}
@@ -0,0 +1,36 @@
+using System.Windows.Input;
+
+namespace JdeScoping.ConfigManager.ViewModels;
+
+/// <summary>
+/// A command implementation that delegates to action methods.
+/// </summary>
+public class RelayCommand : ICommand
+{
+    private readonly Action<object?> _execute;
+    private readonly Predicate<object?>? _canExecute;
+    private EventHandler? _canExecuteChanged;
+
+    public event EventHandler? CanExecuteChanged
+    {
+        add => _canExecuteChanged += value;
+        remove => _canExecuteChanged -= value;
+    }
+
+    public RelayCommand(Action<object?> execute, Predicate<object?>? canExecute = null)
+    {
+        _execute = execute ?? throw new ArgumentNullException(nameof(execute));
+        _canExecute = canExecute;
+    }
+
+    public RelayCommand(Action execute, Func<bool>? canExecute = null)
+        : this(_ => execute(), canExecute != null ? _ => canExecute() : null)
+    {
+    }
+
+    public bool CanExecute(object? parameter) => _canExecute?.Invoke(parameter) ?? true;
+
+    public void Execute(object? parameter) => _execute(parameter);
+
+    public void RaiseCanExecuteChanged() => _canExecuteChanged?.Invoke(this, EventArgs.Empty);
+}
@@ -0,0 +1,27 @@
+using System.ComponentModel;
+using System.Runtime.CompilerServices;
+
+namespace JdeScoping.ConfigManager.ViewModels;
+
+/// <summary>
+/// Base class for all view models providing INotifyPropertyChanged implementation.
+/// </summary>
+public abstract class ViewModelBase : INotifyPropertyChanged
+{
+    public event PropertyChangedEventHandler? PropertyChanged;
+
+    protected virtual void OnPropertyChanged([CallerMemberName] string? propertyName = null)
+    {
+        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+    }
+
+    protected bool SetProperty<T>(ref T field, T value, [CallerMemberName] string? propertyName = null)
+    {
+        if (EqualityComparer<T>.Default.Equals(field, value))
+            return false;
+
+        field = value;
+        OnPropertyChanged(propertyName);
+        return true;
+    }
+}