Intercepting containers for threads.

2025-10-26 23:35:09 +01:00
parent 79d5b6ed40
commit d9fc365aeb
12 changed files with 528 additions and 175 deletions
@@ -0,0 +1,77 @@
+using CommunityToolkit.Mvvm.Messaging;
+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
+using Wino.Mail.ViewModels.Data;
+using Wino.Messaging.Client.Mails;
+
+namespace Wino.Mail.WinUI.Controls.ListView;
+
+public partial class WinoMailItemViewModelListViewItem : ListViewItem
+{
+    public WinoMailItemViewModelListViewItem()
+    {
+        DefaultStyleKey = typeof(WinoMailItemViewModelListViewItem);
+
+        RegisterPropertyChangedCallback(IsSelectedProperty, OnIsSelectedChanged);
+    }
+
+    protected override void OnContentChanged(object oldContent, object newContent)
+    {
+        base.OnContentChanged(oldContent, newContent);
+
+        if (oldContent is MailItemViewModel oldMailItem)
+        {
+            UnregisterSelectionCallback(oldMailItem);
+        }
+
+        if (newContent is MailItemViewModel newMailItem)
+        {
+            IsSelected = newMailItem.IsSelected;
+            RegisterSelectionCallback(newMailItem);
+        }
+    }
+
+    private void UnregisterSelectionCallback(IMailListItem mailItem)
+    {
+        mailItem.PropertyChanged -= MailPropChanged;
+    }
+
+    private void RegisterSelectionCallback(IMailListItem mailItem)
+    {
+        mailItem.PropertyChanged += MailPropChanged;
+    }
+
+    // From model
+    private void MailPropChanged(object? sender, System.ComponentModel.PropertyChangedEventArgs e)
+    {
+        if (sender is not MailItemViewModel mailItem) return;
+
+        if (e.PropertyName == nameof(MailItemViewModel.IsSelected)) ApplySelectionForContainer(mailItem);
+    }
+
+    // From container.
+    private void OnIsSelectedChanged(DependencyObject sender, DependencyProperty dp)
+    {
+        if (Content is IMailListItem mailItem)
+        {
+            ApplySelectionForModel(mailItem);
+        }
+    }
+
+    private void ApplySelectionForModel(IMailListItem mailItem)
+    {
+        if (mailItem.IsSelected != IsSelected)
+        {
+            mailItem.IsSelected = IsSelected;
+            WeakReferenceMessenger.Default.Send(new SelectedItemsChangedMessage());
+        }
+    }
+
+    private void ApplySelectionForContainer(IMailListItem mailItem)
+    {
+        if (IsSelected != mailItem.IsSelected)
+        {
+            IsSelected = mailItem.IsSelected;
+        }
+    }
+}