Catel - Part 4 of n: Unit testing with Catel

// --------------------------------------------------------------------------------------------------------------------
// <copyright file="TipOfTheDayItemEditorWindow.xaml.cs" company="Catel development team">
//   Copyright (c) 2008 - 2011 Catel development team. All rights reserved.
// </copyright>
// <summary>
//   Interaction logic for TipOfTheDayItemEditorWindow.xaml
// </summary>
// --------------------------------------------------------------------------------------------------------------------

using System.Windows;
using Catel.Windows.Data;

namespace Catel.Windows
{
    /// <summary>
    /// Interaction logic for TipOfTheDayItemEditorWindow.xaml
    /// </summary>
    public partial class TipOfTheDayItemEditorWindow : DataWindow
    {
        #region Variables
        private TipOfTheDayItem _tipOfTheDay;
        #endregion

        #region Constructor & destructor
        /// <summary>
        /// Initializes a new instance of the <see cref="TipOfTheDayItemEditorWindow"/> class.
        /// </summary>
        /// <param name="tipOfTheDay">The tip of the day.</param>
        public TipOfTheDayItemEditorWindow(TipOfTheDayItem tipOfTheDay)
            : base(DataWindowMode.OkCancel)
        {
            _tipOfTheDay = tipOfTheDay;

            TipOfTheDay = new TipOfTheDayItem() { Title = tipOfTheDay.Title, Description = tipOfTheDay.Description };

            InitializeComponent();
        }
        #endregion

        #region Properties
        /// <summary>
        /// Gets or sets TipOfTheDay.
        /// </summary>
        /// <remarks>
        /// Wrapper for the TipOfTheDay dependency property.
        /// </remarks>
        public TipOfTheDayItem TipOfTheDay
        {
            get { return (TipOfTheDayItem)GetValue(TipOfTheDayProperty); }
            private set { SetValue(TipOfTheDayPropertyKey, value); }
        }

        /// <summary>
        /// Definition of the dependency property is private.
        /// </summary>
        private static readonly DependencyPropertyKey TipOfTheDayPropertyKey =
            DependencyProperty.RegisterReadOnly("TipOfTheDay", typeof(TipOfTheDayItem), typeof(TipOfTheDayItemEditorWindow), new UIPropertyMetadata(null));

        /// <summary>
        /// Read-only dependencyProperty definition as the backing store for TipOfTheDay.
        /// </summary>
        public static readonly DependencyProperty TipOfTheDayProperty = TipOfTheDayPropertyKey.DependencyProperty;
        #endregion

        #region Methods
        /// <summary>
        /// Validates the data.
        /// </summary>
        /// <returns>True if successful, otherwise false.</returns>
        protected override bool ValidateData()
        {
            if (string.IsNullOrEmpty(TipOfTheDay.Title))
            {
                return false;
            }

            if (string.IsNullOrEmpty(TipOfTheDay.Description))
            {
                return false;
            }

            return true;
        }

        /// <summary>
        /// Discards all changes made by this window.
        /// </summary>
        protected override void DiscardChanges()
        {
            // Do nothing, we didn't modify the actual object
        }

        /// <summary>
        /// Applies all changes made by this window.
        /// </summary>
        /// <returns>True if successful, otherwise false.</returns>
        protected override bool ApplyChanges()
        {
            _tipOfTheDay.Title = TipOfTheDay.Title;
            _tipOfTheDay.Description = TipOfTheDay.Description;

            return true;
        }
        #endregion
    }
}