78 lines
2.5 KiB
C#
78 lines
2.5 KiB
C#
using System;
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using System.Windows.Input;
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namespace FSI.Lib.MVVM
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{
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public class RelayCommand<T> : ICommand
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{
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#region Fields
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readonly Action<T> _execute = null;
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readonly Predicate<T> _canExecute = null;
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#endregion
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#region Constructors
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/// <summary>
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/// Initializes a new instance of <see cref="DelegateCommand{T}"/>.
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/// </summary>
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/// <param name="execute">Delegate to execute when Execute is called on the command. This can be null to just hook up a CanExecute delegate.</param>
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/// <remarks><seealso cref="CanExecute"/> will always return true.</remarks>
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public RelayCommand(Action<T> 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<T> execute, Predicate<T> 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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#endregion
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#region ICommand Members
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///<summary>
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///Defines the method that determines whether the command can execute in its current state.
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///</summary>
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///<param name="parameter">Data used by the command. If the command does not require data to be passed, this object can be set to null.</param>
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///<returns>
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///true if this command can be executed; otherwise, false.
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///</returns>
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public bool CanExecute(object parameter)
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{
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return _canExecute == null ? true : _canExecute((T)parameter);
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}
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///<summary>
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///Occurs when changes occur that affect whether or not the command should execute.
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///</summary>
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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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///<summary>
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///Defines the method to be called when the command is invoked.
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///</summary>
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///<param name="parameter">Data used by the command. If the command does not require data to be passed, this object can be set to <see langword="null" />.</param>
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public void Execute(object parameter)
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{
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_execute((T)parameter);
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}
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#endregion
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}
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}
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