89 lines
3.2 KiB
C#
89 lines
3.2 KiB
C#
#region Apache License 2.0
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/*
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Nuclex .NET Framework
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Copyright (C) 2002-2024 Markus Ewald / Nuclex Development Labs
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#endregion // Apache License 2.0
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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 user controls that act as views connected to a view model
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/// </summary>
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public class ViewControl : UserControl, IView {
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/// <summary>Initializes a new view control</summary>
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public ViewControl() {
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this.onViewModelPropertyChangedDelegate = OnViewModelPropertyChanged;
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}
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/// <summary>Called when the control's data context is changed</summary>
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/// <param name="sender">Control 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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