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Catel - Part 4 of n: Unit testing with Catel

, 28 Jan 2011
This article explains how to write unit tests for MVVM using Catel.
Catel-04_01-unittesting.zip
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TraceAndTestImpact.testsettings
// --------------------------------------------------------------------------------------------------------------------
// <copyright file="ControlToViewModelAttribute.cs" company="Catel development team">
//   Copyright (c) 2008 - 2011 Catel development team. All rights reserved.
// </copyright>
// <summary>
//   Mapping types for the <see cref="ControlToViewModelAttribute" />.
// </summary>
// --------------------------------------------------------------------------------------------------------------------

using System;
using System.Windows;
using Catel.Windows;
using Catel.Windows.Controls;

namespace Catel.MVVM.UI
{
    #region Enums
    /// <summary>
    /// Mapping types for the <see cref="ControlToViewModelAttribute"/>.
    /// </summary>
    public enum ControlViewModelModelMappingType
    {
        /// <summary>
        /// Two way, which means that either the control or the view model will update
        /// the values of the other party as soon as they are updated.
        /// <para />
        /// When this value is used, nothing happens when the view model of the user control
        /// changes. This way, it might be possible that the values of the control and the
        /// view model are different. The first one to update next will update the other.
        /// </summary>
        TwoWayDoNothing,

        /// <summary>
        /// Two way, which means that either the control or the view model will update
        /// the values of the other party as soon as they are updated.
        /// <para />
        /// When this value is used, the value of the control is used when the view model 
        /// of the user control is changed, and is directly transferred to the view model value.
        /// </summary>
        TwoWayControlWins,

        /// <summary>
        /// Two way, which means that either the control or the view model will update
        /// the values of the other party as soon as they are updated.
        /// <para />
        /// When this value is used, the value of the view model is used when the view model 
        /// of the user control is changed, and is directly transferred to the control value.
        /// </summary>
        TwoWayViewModelWins,

        /// <summary>
        /// The mapping is from the control to the view model only.
        /// </summary>
        ControlToViewModel,

        /// <summary>
        /// The mapping is from the view model to the control only.
        /// </summary>
        ViewModelToControl
    }
    #endregion

    /// <summary>
    /// A mapper attribute to map a <see cref="FrameworkElement"/> (such as the <see cref="UserControl{TViewModel}"/>
    /// or the <see cref="DataWindow{TViewModel}"/> property to a <see cref="ViewModelBase"/> property.
    /// <para />
    /// This class is very useful when creating custom user controls that need more parameterized settings than just the
    /// <see cref="System.Windows.Controls.UserControl.DataContext"/> property.
    /// </summary>
    [AttributeUsage(AttributeTargets.Property, AllowMultiple = false, Inherited = false)]
    public class ControlToViewModelAttribute : Attribute
    {
        #region Constructor & destructor
        /// <summary>
        /// Initializes a new instance of the <see cref="ControlToViewModelAttribute"/> class.
        /// </summary>
        public ControlToViewModelAttribute()
        {
            MappingType = ControlViewModelModelMappingType.TwoWayViewModelWins;
        }

        /// <summary>
        /// Initializes a new instance of the <see cref="ControlToViewModelAttribute"/> class.
        /// </summary>
        /// <param name="viewModelPropertyName">Name of the view model property.</param>
        public ControlToViewModelAttribute(string viewModelPropertyName)
            : this()
        {
            ViewModelPropertyName = viewModelPropertyName;
        }
        #endregion

        #region Properties
        /// <summary>
        /// Gets or sets the view model property name.
        /// </summary>
        /// <value>The view model property name.</value>
        public string ViewModelPropertyName { get; private set; }

        /// <summary>
        /// Gets or sets the type of the mapping.
        /// </summary>
        /// <value>The type of the mapping.</value>
        public ControlViewModelModelMappingType MappingType { get; set; }
        #endregion
    }
}

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About the Author

Geert van Horrik
Software Developer CatenaLogic
Netherlands Netherlands
I am Geert van Horrik, and I have studied Computer Science in the Netherlands.
 
I love to write software using .NET (especially the combination of WPF and C#). I am also the lead developer of Catel, an open-source application development framework for WPF, Silverlight, WP7 and WinRT with the focus on MVVM.
 
I have my own company since January 1st 2007, called CatenaLogic. This company develops commercial and non-commercial software.
 
To download (or buy) applications I have written, visit my website: http://www.catenalogic.com
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