97 lines
3.4 KiB
C#
97 lines
3.4 KiB
C#
#region Apache License 2.0
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/*
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Nuclex Foundation libraries for .NET
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Copyright (C) 2002-2025 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 Avalonia.Controls;
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using Nuclex.Avalonia.ViewModels;
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namespace Nuclex.Avalonia.AutoBinding {
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/// <summary>
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/// Binds a view to its model using a convention-over-configuration approach
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/// </summary>
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public class ConventionBinder : IAutoBinder {
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/// <summary>Binds the specified view to an explicitly selected view model</summary>
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/// <typeparam name="TViewModel">
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/// Type of view model the view will be bound to
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/// </typeparam>
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/// <param name="view">View that will be bound to a view model</param>
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/// <param name="viewModel">View model the view will be bound to</param>
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public void Bind<TViewModel>(Control view, TViewModel? viewModel)
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where TViewModel : class {
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if(viewModel != null) {
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bind(view, viewModel);
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}
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}
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/// <summary>
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/// Binds the specified view to the view model specified in its DataContext
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/// </summary>
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/// <param name="viewControl">View that will be bound</param>
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public void Bind(Control viewControl) {
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if(viewControl.DataContext != null) {
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bind(viewControl, viewControl.DataContext);
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}
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}
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/// <summary>Binds a view to a view model</summary>
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/// <param name="view">View that will be bound</param>
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/// <param name="viewModel">View model the view will be bound to</param>
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private void bind(Control view, object viewModel) {
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IDialogViewModel? dialogViewModel = viewModel as IDialogViewModel;
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if(dialogViewModel != null) {
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Window? viewAsWindow = view as Window;
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if(viewAsWindow != null) {
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bindViewModelSubmitToDialogClose(viewAsWindow, dialogViewModel);
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}
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}
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}
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/// <summary>
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/// Convention binding for view models with a 'Submit' event,
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/// closes the dialog when the view model fires the event
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/// </summary>
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/// <param name="dialogWindow">Window the displays the dialog's UI</param>
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/// <param name="dialogViewModel">View model that has the 'Submit' event</param>
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private static void bindViewModelSubmitToDialogClose(
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Window dialogWindow, IDialogViewModel dialogViewModel
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) {
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EventHandler<DialogResultEventArgs> handler = (
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delegate(object sender, DialogResultEventArgs arguments) {
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dialogWindow.Close(arguments.Result);
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}
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);
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dialogViewModel.Submitted += handler;
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// Does this help anything?
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// Without it, the view has a reference to the view model (via DataContext),
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// and the view model references the view (via event subscription), but this
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// shouldn't bother the .NET garbage collector at all.
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dialogWindow.Closed += delegate(object sender, EventArgs arguments) {
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dialogViewModel.Submitted -= handler;
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};
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}
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}
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} // namespace Nuclex.Avalonia.AutoBinding
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