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80 lines
2.7 KiB
C#
80 lines
2.7 KiB
C#
// Licensed to the .NET Foundation under one or more agreements.
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// The .NET Foundation licenses this file to you under the MIT license.
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// See the LICENSE file in the project root for more information.
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// This file is inspired from the MvvmLight library (lbugnion/MvvmLight),
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// more info in ThirdPartyNotices.txt in the root of the project.
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using System;
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using System.Runtime.CompilerServices;
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namespace CommunityToolkit.Mvvm.Input;
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/// <summary>
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/// A command whose sole purpose is to relay its functionality to other
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/// objects by invoking delegates. The default return value for the <see cref="CanExecute"/>
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/// method is <see langword="true"/>. This type does not allow you to accept command parameters
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/// in the <see cref="Execute"/> and <see cref="CanExecute"/> callback methods.
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/// </summary>
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public sealed class RelayCommand : IRelayCommand
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{
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/// <summary>
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/// The <see cref="Action"/> to invoke when <see cref="Execute"/> is used.
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/// </summary>
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private readonly Action execute;
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/// <summary>
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/// The optional action to invoke when <see cref="CanExecute"/> is used.
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/// </summary>
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private readonly Func<bool>? canExecute;
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/// <inheritdoc/>
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public event EventHandler? CanExecuteChanged;
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/// <summary>
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/// Initializes a new instance of the <see cref="RelayCommand"/> class that can always execute.
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/// </summary>
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/// <param name="execute">The execution logic.</param>
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/// <exception cref="System.ArgumentNullException">Thrown if <paramref name="execute"/> is <see langword="null"/>.</exception>
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public RelayCommand(Action execute)
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{
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ArgumentNullException.ThrowIfNull(execute);
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this.execute = execute;
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="RelayCommand"/> class.
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/// </summary>
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/// <param name="execute">The execution logic.</param>
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/// <param name="canExecute">The execution status logic.</param>
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/// <exception cref="System.ArgumentNullException">Thrown if <paramref name="execute"/> or <paramref name="canExecute"/> are <see langword="null"/>.</exception>
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public RelayCommand(Action execute, Func<bool> canExecute)
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{
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ArgumentNullException.ThrowIfNull(execute);
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ArgumentNullException.ThrowIfNull(canExecute);
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this.execute = execute;
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this.canExecute = canExecute;
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}
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/// <inheritdoc/>
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public void NotifyCanExecuteChanged()
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{
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CanExecuteChanged?.Invoke(this, EventArgs.Empty);
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}
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/// <inheritdoc/>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public bool CanExecute(object? parameter)
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{
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return this.canExecute?.Invoke() != false;
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}
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/// <inheritdoc/>
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public void Execute(object? parameter)
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{
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this.execute();
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}
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}
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