ILSpy/ILSpy/Commands/SimpleCommand.cs

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using System;
using System.Windows.Input;

using global::Avalonia.Data;

namespace ICSharpCode.ILSpy.Commands
{
	/// <summary>
	/// Minimal ICommand base. Avalonia has no global RequerySuggested signal like WPF's CommandManager,
	/// so CanExecuteChanged is routed through our own <see cref="CommandManager"/>. State-change
	/// sites call <see cref="CommandManager.InvalidateRequerySuggested"/> and every bound command
	/// re-evaluates -- no per-command wiring, and the menu/toolbar item updates its enabled
	/// state on every platform.
	/// </summary>
	public abstract class SimpleCommand : ICommand
	{
		public event EventHandler? CanExecuteChanged {
			add { if (value is not null) CommandManager.AddRequerySuggested(value); }
			remove { if (value is not null) CommandManager.RemoveRequerySuggested(value); }
		}

		public abstract void Execute(object? parameter);

		public virtual bool CanExecute(object? parameter) => true;

		/// <summary>Asks all bound commands to re-evaluate CanExecute (a global invalidate -- the
		/// re-query is shared, so this is not scoped to this single command).</summary>
		protected static void RaiseCanExecuteChanged() => CommandManager.InvalidateRequerySuggested();
	}

	/// <summary>
	/// Allows a command to declare an Avalonia <see cref="BindingBase"/> that the menu/toolbar
	/// builder should attach to the host item's CommandParameter property — used when the
	/// parameter must come from the visual tree (e.g. the owning Window) rather than be a
	/// fixed value.
	/// </summary>
	public interface IProvideParameterBinding
	{
		BindingBase ParameterBinding { get; }
	}
}