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- using System;
- using System.Collections.Generic;
- using System.Linq;
- using System.Text;
- using System.Threading.Tasks;
- using System.Windows.Input;
- namespace TouristApp_V3.Common
- {
- public class RelayCommand : ICommand
- {
- private Action<object> _action;
- public RelayCommand(Action<object> action)
- {
- _action = action;
- }
- #region ICommand Members
- #endregion
- /// <summary>
- /// A command whose sole purpose is to relay its functionality
- /// to other objects by invoking delegates.
- /// The default return value for the CanExecute method is 'true'.
- /// <see cref="RaiseCanExecuteChanged"/> needs to be called whenever
- /// <see cref="CanExecute"/> is expected to return a different value.
- /// </summary>
- private readonly Action _execute;
- private readonly Func<bool> _canExecute;
- /// <summary>
- /// Raised when RaiseCanExecuteChanged is called.
- /// </summary>
- public event EventHandler CanExecuteChanged;
- /// <summary>
- /// Creates a new command that can always execute.
- /// </summary>
- /// <param name="execute">The execution logic.</param>
- public RelayCommand(Action execute)
- : this(execute, null)
- {
- }
- /// <summary>
- /// Creates a new command.
- /// </summary>
- /// <param name="execute">The execution logic.</param>
- /// <param name="canExecute">The execution status logic.</param>
- public RelayCommand(Action execute, Func<bool> canExecute)
- {
- if (execute == null)
- throw new ArgumentNullException("execute");
- _execute = execute;
- _canExecute = canExecute;
- }
- /// <summary>
- /// Determines whether this <see cref="RelayCommand"/> can execute in its current state.
- /// </summary>
- /// <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>
- /// <returns>true if this command can be executed; otherwise, false.</returns>
- public bool CanExecute(object parameter)
- {
- return _canExecute == null ? true : _canExecute();
- }
- /// <summary>
- /// Executes the <see cref="RelayCommand"/> on the current command target.
- /// </summary>
- /// <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>
- public void Execute(object parameter)
- {
- _execute();
- }
- /// <summary>
- /// Method used to raise the <see cref="CanExecuteChanged"/> event
- /// to indicate that the return value of the <see cref="CanExecute"/>
- /// method has changed.
- /// </summary>
- public void RaiseCanExecuteChanged()
- {
- var handler = CanExecuteChanged;
- if (handler != null)
- {
- handler(this, EventArgs.Empty);
- }
- }
- }
- }
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