Binding Command to ApplicationCommands.New

image_pdfimage_print


   
 

<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="CommandHandling" Height="300" Width="300"
    >
    <DockPanel>
      <Menu DockPanel.Dock="Top">
        <MenuItem Header="_File">
          <MenuItem Command="New" />
        </MenuItem>
      </Menu>
      <TextBox x:Name="inputBox" TextChanged="OnTextboxTextChanged" />
    </DockPanel>
</Window>

//File:Window.xaml.cs
using System;
using System.Collections.Generic;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;


namespace WpfApplication1
{
    public partial class Window1 : Window
    {
        bool unsavedChanges = false;
        
        public Window1()
        {
            InitializeComponent();

            CommandBinding cmdBindingNew = new CommandBinding(ApplicationCommands.New);
            cmdBindingNew.Executed += NewCommandHandler;
            CommandBindings.Add(cmdBindingNew);
        }

        void NewCommandHandler(object sender, ExecutedRoutedEventArgs e)
        {
            if (unsavedChanges)
            {
                MessageBoxResult result = MessageBox.Show(this,"Save changes to existing document?", "New",MessageBoxButton.YesNoCancel);

                if (result == MessageBoxResult.Cancel){
                    return;
                }
                if (result == MessageBoxResult.Yes){
                    SaveChanges();
                }
            }
            inputBox.Clear();
        }
        private void OnTextboxTextChanged(object sender, RoutedEventArgs e){
            unsavedChanges = true;
            Console.WriteLine("changed");
        }

        private void SaveChanges(){
            unsavedChanges = false;
            Console.WriteLine("saved");
        }

    }
}