62 lines
1.7 KiB
C#
62 lines
1.7 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Windows.Input;
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using System.Diagnostics;
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namespace NAudioWpfDemo
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{
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// from Josh Smith's Crack .NET
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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 CanExecute
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/// method is 'true'.
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/// </summary>
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internal class RelayCommand : ICommand
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{
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readonly Action _execute;
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readonly Func<bool> _canExecute;
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/// <summary>
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/// Creates a new command that can always execute.
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/// </summary>
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/// <param name="execute">The execution logic.</param>
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public RelayCommand(Action execute)
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: this(execute, null)
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{
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}
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/// <summary>
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/// Creates a new command.
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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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public RelayCommand(Action execute, Func<bool> canExecute)
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{
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if (execute == null)
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throw new ArgumentNullException("execute");
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_execute = execute;
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_canExecute = canExecute;
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}
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[DebuggerStepThrough]
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public bool CanExecute(object parameter)
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{
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return _canExecute == null ? true : _canExecute();
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}
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public event EventHandler CanExecuteChanged
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{
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add { CommandManager.RequerySuggested += value; }
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remove { CommandManager.RequerySuggested -= value; }
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}
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public void Execute(object parameter)
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{
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_execute();
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}
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}
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}
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