a17926d02e
git-svn-id: file:///srv/devel/repo-conversion/nuwi@48 d2e56fa2-650e-0410-a79f-9358c0239efd
90 lines
3.3 KiB
C#
90 lines
3.3 KiB
C#
#region CPL License
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/*
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Nuclex Framework
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Copyright (C) 2002-2019 Nuclex Development Labs
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This library is free software; you can redistribute it and/or
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modify it under the terms of the IBM Common Public License as
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published by the IBM Corporation; either version 1.0 of the
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License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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IBM Common Public License for more details.
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You should have received a copy of the IBM Common Public
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License along with this library
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*/
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#endregion
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using System;
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using System.ComponentModel;
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using System.Windows.Forms;
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using Nuclex.Support;
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namespace Nuclex.Windows.Forms.Views {
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/// <summary>
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/// Base class for MVVM windows that act as views connected to a view model
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/// </summary>
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public class ViewForm : Form, IView {
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/// <summary>Initializes a new view control</summary>
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public ViewForm() {
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this.onViewModelPropertyChangedDelegate = OnViewModelPropertyChanged;
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}
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/// <summary>Called when the window's data context is changed</summary>
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/// <param name="sender">Window whose data context was changed</param>
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/// <param name="oldDataContext">Data context that was previously used</param>
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/// <param name="newDataContext">Data context that will be used from now on</param>
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protected virtual void OnDataContextChanged(
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object sender, object oldDataContext, object newDataContext
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) {
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var oldViewModel = oldDataContext as INotifyPropertyChanged;
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if(oldViewModel != null) {
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oldViewModel.PropertyChanged -= this.onViewModelPropertyChangedDelegate;
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}
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var newViewModel = newDataContext as INotifyPropertyChanged;
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if(newViewModel != null) {
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newViewModel.PropertyChanged += this.onViewModelPropertyChangedDelegate;
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InvalidateAllViewModelProperties();
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}
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}
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/// <summary>Refreshes all properties from the view model</summary>
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protected void InvalidateAllViewModelProperties() {
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OnViewModelPropertyChanged(this.dataContext, PropertyChangedEventArgsHelper.Wildcard);
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}
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/// <summary>Called when a property of the view model is changed</summary>
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/// <param name="sender">View model in which a property was changed</param>
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/// <param name="arguments">Contains the name of the property that has changed</param>
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protected virtual void OnViewModelPropertyChanged(
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object sender, PropertyChangedEventArgs arguments
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) { }
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/// <summary>Provides the data binding target for the view</summary>
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public object DataContext {
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get { return this.dataContext; }
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set {
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if(value != this.dataContext) {
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object oldDataContext = this.dataContext;
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this.dataContext = value;
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OnDataContextChanged(this, oldDataContext, value);
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}
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}
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}
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/// <summary>Active data binding target, can be null</summary>
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private object dataContext;
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/// <summary>Delegate for the OnViewModelPropertyChanged() method</summary>
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private PropertyChangedEventHandler onViewModelPropertyChangedDelegate;
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}
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} // namespace Nuclex.Windows.Forms.Views
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