More interactions with threads.

Wino.Mail.ViewModels/Collections/WinoMailCollection.cs

@@ -75,6 +75,11 @@ public class WinoMailCollection : ObservableRecipient, IRecipient<SelectedItemsC
         Messenger.Register<SelectedItemsChangedMessage>(this);
     }
 
+    public void Cleanup()
+    {
+        Messenger.Unregister<SelectedItemsChangedMessage>(this);
+    }
+
     public async Task ClearAsync()
     {
         await ExecuteUIThread(() =>

Wino.Mail.ViewModels/MailListPageViewModel.cs

@@ -204,11 +204,14 @@ public partial class MailListPageViewModel : MailBaseViewModel,
         MailCollection.ItemSelectionChanged += MailItemSelectionChanged;
     }
 
-    public override void OnNavigatedFrom(NavigationMode mode, object parameters)
+    public override async void OnNavigatedFrom(NavigationMode mode, object parameters)
     {
         base.OnNavigatedFrom(mode, parameters);
 
         MailCollection.ItemSelectionChanged -= MailItemSelectionChanged;
+
+        await MailCollection.ClearAsync();
+        MailCollection.Cleanup();
     }
 
     private void MailItemSelectionChanged(object sender, EventArgs e)

Wino.Mail.WinUI/Controls/ListView/WinoMailItemViewModelListViewItem.cs

@@ -71,11 +71,8 @@ public partial class WinoMailItemViewModelListViewItem : ListViewItem
 
     private void ApplySelectionForModel(IMailListItem mailItem)
     {
-        if (mailItem.IsSelected != IsSelected)
+        mailItem.IsSelected = IsSelected;
-        {
+        WeakReferenceMessenger.Default.Send(new SelectedItemsChangedMessage());
-            mailItem.IsSelected = IsSelected;
-            WeakReferenceMessenger.Default.Send(new SelectedItemsChangedMessage());
-        }
     }
 
     private void ApplySelectionForContainer(IMailListItem mailItem)

Wino.Mail.WinUI/Controls/ListView/WinoThreadMailItemViewModelListViewItem.cs

@@ -49,15 +49,23 @@ public partial class WinoThreadMailItemViewModelListViewItem : ListViewItem
 
         if (innerControl == null || control == null || expander == null) return;
 
-        // 1
-        expander.IsExpanded = control.IsThreadExpanded;
 
         // 2
         if (control.IsThreadExpanded && innerControl.SelectedItems.Count == 0 && innerControl.Items.Count > 0)
         {
-            innerControl.SelectedItem = innerControl.Items[0];
+            innerControl.SelectedItems.Clear();
+
+            // Make item selected, container might not be realized yet, so set on the model.
+            // It'll appear selected when container is realized.
+
+            var firstItem = innerControl.Items.FirstOrDefault() as MailItemViewModel;
+
+            firstItem?.IsSelected = true;
         }
 
+        // 1
+        expander.IsExpanded = control.IsThreadExpanded;
+
         // 3
         if (!control.IsSelected) innerControl?.SelectedItems.Clear();
     }
@@ -103,14 +111,6 @@ public partial class WinoThreadMailItemViewModelListViewItem : ListViewItem
         mailItem.PropertyChanged += MailPropChanged;
     }
 
-    private void ApplySelectionForModel(ThreadMailItemViewModel mailItem)
-    {
-        if (mailItem.IsThreadExpanded != IsThreadExpanded)
-        {
-            mailItem.IsThreadExpanded = IsThreadExpanded;
-        }
-    }
-
     private void ApplySelectionForContainer(ThreadMailItemViewModel mailItem)
     {
         if (IsThreadExpanded != mailItem.IsThreadExpanded) IsThreadExpanded = mailItem.IsThreadExpanded;

Wino.Mail.WinUI/Views/MailListPage.xaml

@@ -92,9 +92,9 @@
                     <listview:WinoListView
                         HorizontalAlignment="Stretch"
                         HorizontalContentAlignment="Stretch"
-                        ChoosingItemContainer="WinoListViewChoosingItemContainer"
                         toolkitExt:ListViewExtensions.ItemContainerStretchDirection="Horizontal"
                         toolkitExt:ScrollViewerExtensions.VerticalScrollBarMargin="0"
+                        ChoosingItemContainer="WinoListViewChoosingItemContainer"
                         ItemContainerStyle="{StaticResource DefaultMailListViewItemStyle}"
                         ItemTemplate="{StaticResource SingleMailItemTemplate}"
                         ItemsSource="{x:Bind ThreadEmails, Mode=OneTime}"
@@ -381,10 +381,12 @@
                     <listview:WinoListView
                         x:Name="MailListView"
                         HorizontalAlignment="Stretch"
-                        ChoosingItemContainer="WinoListViewChoosingItemContainer"
                         HorizontalContentAlignment="Stretch"
                         toolkitExt:ListViewExtensions.ItemContainerStretchDirection="Horizontal"
                         toolkitExt:ScrollViewerExtensions.VerticalScrollBarMargin="0"
+                        ChoosingItemContainer="WinoListViewChoosingItemContainer"
+                        IsItemClickEnabled="True"
+                        ItemClick="WinoListView_ItemClick"
                         ItemContainerStyleSelector="{StaticResource WinoMailItemContainerStyleSelector}"
                         ItemTemplateSelector="{StaticResource MailItemTemplateSelector}"
                         ItemsSource="{x:Bind MailCollectionViewSource.View, Mode=OneWay}"

Wino.Mail.WinUI/Views/MailListPage.xaml.cs

@@ -70,6 +70,8 @@ public sealed partial class MailListPage : MailListPageAbstract,
         this.Bindings.StopTracking();
 
         ViewModel.MailCollection.ItemSelectionChanged -= WinoMailCollectionSelectionChanged;
+        SelectAllCheckbox.Checked -= SelectAllCheckboxChecked;
+        SelectAllCheckbox.Unchecked -= SelectAllCheckboxUnchecked;
 
         RenderingFrame.Navigate(typeof(IdlePage));
 
@@ -547,4 +549,19 @@ public sealed partial class MailListPage : MailListPageAbstract,
     {
 
     }
+
+    private void WinoListView_ItemClick(object sender, ItemClickEventArgs e)
+    {
+        if (e.ClickedItem is ThreadMailItemViewModel clickedThread)
+        {
+            // Only if container is selected.
+
+            var threadContainer = MailListView.ContainerFromItem(clickedThread) as WinoThreadMailItemViewModelListViewItem;
+
+            if (threadContainer?.IsSelected ?? false)
+            {
+                clickedThread.IsThreadExpanded = !clickedThread.IsThreadExpanded;
+            }
+        }
+    }
 }