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using System;
using System.Windows.Input;
using AppKit;
namespace Xamarin.PropertyEditing.Mac
{
public class CommandMenuItem : NSMenuItem
{
ICommand command;
public ICommand Command {
get { return command; }
set {
if (this.command != null)
this.command.CanExecuteChanged -= CanExecuteChanged;
this.command = value;
this.command.CanExecuteChanged += CanExecuteChanged;
}
}
public CommandMenuItem (string title) : base (title)
{
HookUpCommandEvents ();
}
public CommandMenuItem (string title, ICommand command) : this (title)
{
this.Command = command;
}
private void HookUpCommandEvents ()
{
Activated += (object sender, EventArgs e) => {
if (this.command != null) {
this.command.Execute (null);
}
};
ValidateMenuItem = ValidatePropertyMenuItem;
}
private bool ValidatePropertyMenuItem (NSMenuItem menuItem)
{
if (this.command != null)
return this.command.CanExecute (null);
return false;
}
private void CanExecuteChanged (object sender, EventArgs e)
{
if(sender is ICommand cmd)
this.Enabled = cmd.CanExecute (null);
}
}
}
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