90 lines
2.3 KiB
C#
90 lines
2.3 KiB
C#
using System;
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using System.Diagnostics;
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using System.Windows.Input;
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namespace XLIMS.MVVM.Base
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{
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public class RelayCommand : ICommand
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{
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#region Fields
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readonly Action<object> _execute;
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readonly Predicate<object> _canExecute;
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#endregion // Fields
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#region Constructors
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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<object> 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<object> execute, Predicate<object> 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 // Constructors
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#region ICommand Members
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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(parameter);
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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(parameter);
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}
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#endregion // ICommand Members
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}
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public class RelayCommand<T> : ICommand
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{
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private readonly Action<T> _execute;
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private readonly Func<T, bool> _canExecute;
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public RelayCommand(Action<T> execute, Func<T, 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)
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=> _canExecute == null || _canExecute((T)parameter);
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public void Execute(object parameter)
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=> _execute((T)parameter);
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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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}
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}
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