CadPythonShell/CADPythonShell/RelayCommand.cs at dev · chuongmep/CadPythonShell · GitHub

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using System.Windows;

using System.Windows.Input;

namespace CADPythonShell

{

/// <summary>

/// A general relay command that takes its parameter as an object

/// </summary>

public class RelayCommand : ICommand

{

private readonly Predicate<object> m_canExecute;

private readonly Action<object> m_execute;

private readonly Action _act;

public RelayCommand(Action act)

{

_act = act;

}

public RelayCommand(Action<object> execute, Predicate<object> canExecute = null)

{

if (execute == null)

{

throw new ArgumentNullException("Execute");

}

m_execute = execute;

m_canExecute = canExecute;

}

// Evaluate the command if it is valid to execute

public bool CanExecute(object parameter = null)

{

if (parameter == null || m_canExecute == null) return true;

else return m_canExecute(parameter);

}

// Main execute method

public void Execute(object parameter = null)

{

if (_act != null) _act();

else m_execute(parameter);

}

// In WPF CommandManager is a pre-defined class that take charge of observing the user interface

// and calls the CanExecute method when it deems it necessary

public event EventHandler CanExecuteChanged

{

add => CommandManager.RequerySuggested += value;

remove => CommandManager.RequerySuggested -= value;

}

public class CloseCommand : ICommand

{

public bool CanExecute(object parameter)

{

return true;

}

public event EventHandler CanExecuteChanged

{

add => CommandManager.RequerySuggested += value;

remove => CommandManager.RequerySuggested -= value;

}

public void Execute(object parameter)

{

Window myWin = parameter as Window;

myWin.Close();

}

CadPythonShell/CADPythonShell/RelayCommand.cs at dev · chuongmep/CadPythonShell · GitHub

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