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//------------------------------------------------------------------------------
// <copyright file="ViewService.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
namespace System.Activities.Presentation.Services {
using System;
using System.Windows;
using System.Activities.Presentation.Model;
/// <summary>
/// This service allows you to move between the model and the view.
/// </summary>
public abstract class ViewService {
/// <summary>
/// Constructs a new ViewService.
/// </summary>
protected ViewService() {
}
/// <summary>
/// Returns the model corresponding to the view, or null if
/// there is no model matching the view.
/// </summary>
/// <param name="view">
/// The view object you wish to find the model for.
/// </param>
/// <returns>
/// The corresponding model, or null if there is no model for the
/// given view object.
/// </returns>
/// <exception cref="ArgumentNullException">if view is null.</exception>
public abstract ModelItem GetModel(DependencyObject view);
/// <summary>
/// Returns the view corresponding to the given model. This
/// can return null if there is no view for the model.
/// </summary>
/// <param name="model">
/// The model to return the view object for.
/// </param>
/// <returns>
/// The view for this model, or null if there is no view.
/// </returns>
/// <exception cref="ArgumentNullException">if model is null.</exception>
/// <exception cref="ArgumentException">if model does not represent a valid model for this service.</exception>
public abstract DependencyObject GetView(ModelItem model);
}
}
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