MessageForm.xaml.cs

using System;
using System.Windows;
using System.Windows.Input;
using System.Windows.Media;
using System.Xml;
 
namespace Waher.Client.WPF.Dialogs.Xmpp
{
    public partial class MessageForm : Window
    {
        private bool xmlOk = true;
        private bool toOk = false;
 
        public MessageForm()
        {
            InitializeComponent();
        }
 
        private void CustomXml_TextInput(object Sender, TextCompositionEventArgs e)
        {
            try
            {
                string s = e.Text.Trim();
 
                if (!string.IsNullOrEmpty(s))
                {
                    XmlDocument Doc = new XmlDocument();
                    Doc.LoadXml(s);
 
                    this.CustomXml.Background = null;
                    this.xmlOk = true;
                }
            }
            catch (Exception)
            {
                this.CustomXml.Background = new SolidColorBrush(Colors.PeachPuff);
                this.xmlOk = false;
            }
            finally
            {
                this.SendButton.IsEnabled = this.xmlOk && this.toOk;
            }
        }
 
        private void To_TextChanged(object Sender, System.Windows.Controls.TextChangedEventArgs e)
        {
            string s = this.To.Text.Trim();
 
            this.toOk = !string.IsNullOrEmpty(s);
            this.To.Background = this.toOk ? null : new SolidColorBrush(Colors.PeachPuff);
 
            this.SendButton.IsEnabled = this.xmlOk && this.toOk;
        }
 
        private void SendButton_Click(object Sender, RoutedEventArgs e)
        {
            if (this.xmlOk && this.toOk)
                this.DialogResult = true;
        }
 
        private void CancelButton_Click(object Sender, RoutedEventArgs e)
        {
            this.DialogResult = false;
        }
    }
}