OwnCord/Client/OwnCord.Client/ViewModels/RelayCommand.cs

using System.Windows.Input;

namespace OwnCord.Client.ViewModels;

public sealed class RelayCommand(Action execute, Func<bool>? canExecute = null) : ICommand
{
    public event EventHandler? CanExecuteChanged;

    public bool CanExecute(object? parameter) => canExecute?.Invoke() ?? true;

    public void Execute(object? parameter) => execute();

    public void RaiseCanExecuteChanged() =>
        CanExecuteChanged?.Invoke(this, EventArgs.Empty);
}

public sealed class RelayCommand<T>(Action<T?> execute, Func<T?, bool>? canExecute = null) : ICommand
{
    public event EventHandler? CanExecuteChanged;

    public bool CanExecute(object? parameter) => canExecute?.Invoke((T?)parameter) ?? true;

    public void Execute(object? parameter) => execute((T?)parameter);

    public void RaiseCanExecuteChanged() =>
        CanExecuteChanged?.Invoke(this, EventArgs.Empty);
}