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RelayCommand.cs
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158 lines (140 loc) · 5.82 KB
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// Copyright (c) TensorStack. All rights reserved.
// Licensed under the Apache 2.0 License.
using System;
using System.Diagnostics;
using System.Windows.Input;
namespace TensorStack.WPF
{
/// <summary>
/// Relay command implemtation
/// </summary>
/// <seealso cref="System.Windows.Input.ICommand" />
public class RelayCommand : ICommand
{
readonly Action<object> _execute;
private readonly Func<bool> _canExecute;
/// <summary>
/// Initializes a new instance of the <see cref="RelayCommand"/> class.
/// </summary>
/// <param name="execute">The execute.</param>
public RelayCommand(Action execute) : this(execute, null) { }
/// <summary>
/// Initializes a new instance of the <see cref="RelayCommand"/> class.
/// </summary>
/// <param name="execute">The execute.</param>
public RelayCommand(Action<object> execute) : this(execute, null) { }
/// <summary>
/// Initializes a new instance of the <see cref="RelayCommand"/> class.
/// </summary>
/// <param name="execute">The action to execute.</param>
/// <param name="canExecute">The can execute.</param>
/// <exception cref="System.ArgumentNullException">execute</exception>
public RelayCommand(Action execute, Func<bool> canExecute)
{
if (execute == null)
throw new ArgumentNullException(nameof(execute));
_execute = p => execute();
_canExecute = canExecute;
}
/// <summary>
/// Initializes a new instance of the <see cref="RelayCommand"/> class.
/// </summary>
/// <param name="execute">The execute.</param>
/// <param name="canExecute">The can execute.</param>
/// <exception cref="System.ArgumentNullException">execute</exception>
public RelayCommand(Action<object> execute, Func<bool> canExecute)
{
if (execute == null)
throw new ArgumentNullException(nameof(execute));
_execute = execute;
_canExecute = canExecute;
}
/// <summary>
/// Defines the method that determines whether the command 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>
[DebuggerStepThrough]
public bool CanExecute(object parameter)
{
return _canExecute == null || _canExecute();
}
/// <summary>
/// Occurs when changes occur that affect whether or not the command should execute.
/// </summary>
public event EventHandler CanExecuteChanged
{
add { CommandManager.RequerySuggested += value; }
remove { CommandManager.RequerySuggested -= value; }
}
/// <summary>
/// Defines the method to be called when the command is invoked.
/// </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(parameter);
}
}
/// <summary>
/// Relay command with type argument implemtation
/// </summary>
/// <seealso cref="System.Windows.Input.ICommand" />
public class RelayCommand<T> : ICommand
{
readonly Action<T> _execute;
readonly Predicate<T> _canExecute;
/// <summary>
/// Initializes a new instance of the <see cref="RelayCommand"/> class.
/// </summary>
/// <param name="execute">The execute.</param>
public RelayCommand(Action<T> execute) : this(execute, null) { }
/// <summary>
/// Initializes a new instance of the <see cref="RelayCommand"/> class.
/// </summary>
/// <param name="execute">The action to execute.</param>
/// <param name="canExecute">The can execute.</param>
/// <exception cref="System.ArgumentNullException">execute</exception>
public RelayCommand(Action<T> execute, Predicate<T> canExecute)
{
if (execute == null)
throw new ArgumentNullException(nameof(execute));
_execute = execute;
_canExecute = canExecute;
}
/// <summary>
/// Defines the method that determines whether the command 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>
[DebuggerStepThrough]
public bool CanExecute(object parameter)
{
if (_canExecute == null)
{
return true;
}
return parameter != null && _canExecute((T)parameter);
}
/// <summary>
/// Occurs when changes occur that affect whether or not the command should execute.
/// </summary>
public event EventHandler CanExecuteChanged
{
add { CommandManager.RequerySuggested += value; }
remove { CommandManager.RequerySuggested -= value; }
}
/// <summary>
/// Defines the method to be called when the command is invoked.
/// </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((T)parameter);
}
}
}