58 lines
1.6 KiB
C#
58 lines
1.6 KiB
C#
using System.Windows.Input;
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namespace TeamsISO.App.ViewModels;
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/// <summary>
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/// Synchronous command that delegates execution to an <see cref="Action"/>.
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/// </summary>
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public sealed class RelayCommand : ICommand
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{
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private readonly Action _execute;
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private readonly Func<bool>? _canExecute;
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public RelayCommand(Action execute, Func<bool>? canExecute = null)
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{
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_execute = execute;
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_canExecute = canExecute;
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}
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public bool CanExecute(object? parameter) => _canExecute?.Invoke() ?? true;
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public void Execute(object? parameter) => _execute();
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public event EventHandler? CanExecuteChanged;
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public void RaiseCanExecuteChanged() => CanExecuteChanged?.Invoke(this, EventArgs.Empty);
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}
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/// <summary>
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/// Async command that suppresses re-entrancy while running.
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/// </summary>
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public sealed class AsyncRelayCommand : ICommand
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{
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private readonly Func<Task> _execute;
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private readonly Func<bool>? _canExecute;
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private bool _isRunning;
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public AsyncRelayCommand(Func<Task> execute, Func<bool>? canExecute = null)
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{
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_execute = execute;
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_canExecute = canExecute;
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}
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public bool CanExecute(object? parameter) => !_isRunning && (_canExecute?.Invoke() ?? true);
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public async void Execute(object? parameter)
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{
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if (_isRunning) return;
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_isRunning = true;
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RaiseCanExecuteChanged();
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try { await _execute(); }
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finally
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{
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_isRunning = false;
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RaiseCanExecuteChanged();
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}
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}
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public event EventHandler? CanExecuteChanged;
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public void RaiseCanExecuteChanged() => CanExecuteChanged?.Invoke(this, EventArgs.Empty);
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}
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