feat: enhance PopConfirm with async command support and improve binding. add more demo.

demo/Ursa.Demo/Pages/PopConfirmDemo.axaml

@@ -9,9 +9,23 @@
              x:DataType="viewModels:PopConfirmDemoViewModel"
              x:Class="Ursa.Demo.Pages.PopConfirmDemo">
     <StackPanel HorizontalAlignment="Left">
+        <TextBlock Text="Default PopConfirm" Margin="0 16" />
         <u:PopConfirm PopupHeader="Header" PopupContent="Content" 
-                     ConfirmCommand="{Binding ConfirmCommand}"
+                      ConfirmCommand="{Binding ConfirmCommand}"
-                     CancelCommand="{Binding Path=CancelCommand}" >
+                      CancelCommand="{Binding Path=CancelCommand}" >
+            <Button Content="Hello World"></Button>
+        </u:PopConfirm>
+        <TextBlock Text="Hover to trigger" Margin="0 16" />
+        <u:PopConfirm PopupHeader="Header" PopupContent="Content" 
+                      TriggerMode="Focus"
+                      ConfirmCommand="{Binding ConfirmCommand}"
+                      CancelCommand="{Binding Path=CancelCommand}" >
+            <Button Content="Hello World"></Button>
+        </u:PopConfirm>
+        <TextBlock Text="Asynchronized command support" Margin="0 16" />
+        <u:PopConfirm PopupHeader="Header" PopupContent="Content" 
+                      ConfirmCommand="{Binding AsyncConfirmCommand}"
+                      CancelCommand="{Binding Path=AsyncCancelCommand}" >
             <Button Content="Hello World"></Button>
         </u:PopConfirm>
     </StackPanel>

demo/Ursa.Demo/ViewModels/PopConfirmDemoViewModel.cs

@@ -7,27 +7,42 @@ using Ursa.Controls;
 
 namespace Ursa.Demo.ViewModels;
 
-public partial class PopConfirmDemoViewModel: ObservableObject
+public class PopConfirmDemoViewModel : ObservableObject
 {
+    public PopConfirmDemoViewModel()
+    {
+        AsyncConfirmCommand = new AsyncRelayCommand(OnConfirmAsync);
+        AsyncCancelCommand = new RelayCommand(OnCancelAsync);
+        ConfirmCommand = new RelayCommand(OnConfirm);
+        CancelCommand = new RelayCommand(OnCancel);
+    }
+
     internal WindowToastManager? ToastManager { get; set; }
 
     public ICommand ConfirmCommand { get; }
     public ICommand CancelCommand { get; }
 
-    public PopConfirmDemoViewModel()
+    public ICommand AsyncConfirmCommand { get; }
-    {
+    public ICommand AsyncCancelCommand { get; }
-        ConfirmCommand = new AsyncRelayCommand(OnConfirm);
-        CancelCommand = new RelayCommand(OnCancel);
-    }
-    
-    private async Task OnConfirm()
-    {
-        await Task.Delay(3000);
-        ToastManager?.Show(new Toast("Confirmed"), type: NotificationType.Success, classes: ["Light"]);
-    }
 
     private void OnCancel()
     {
-        ToastManager?.Show(new Toast("Canceled"), type:NotificationType.Error, classes: ["Light"]);
+        ToastManager?.Show(new Toast("Canceled"), NotificationType.Error, classes: ["Light"]);
+    }
+
+    private void OnConfirm()
+    {
+        ToastManager?.Show(new Toast("Confirmed"), NotificationType.Success, classes: ["Light"]);
+    }
+
+    private async Task OnConfirmAsync()
+    {
+        await Task.Delay(3000);
+        ToastManager?.Show(new Toast("Async Confirmed"), NotificationType.Success, classes: ["Light"]);
+    }
+
+    private void OnCancelAsync()
+    {
+        ToastManager?.Show(new Toast("Async Canceled"), NotificationType.Error, classes: ["Light"]);
     }
 }

src/Ursa.Themes.Semi/Controls/PopConfirm.axaml

@@ -12,7 +12,7 @@
                         ContentTemplate="{TemplateBinding ContentTemplate}" />
                     <Popup
                         IsLightDismissEnabled="True"
-                        IsOpen="{TemplateBinding IsDropdownOpen, Mode=TwoWay}"
+                        IsOpen="{Binding IsDropdownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}"
                         OverlayInputPassThroughElement="{Binding #PART_ContentPresenter}"
                         Name="{x:Static u:PopConfirm.PART_Popup}"
                         Placement="{TemplateBinding Placement}" >

src/Ursa/Controls/PopConfirm/PopConfirm.cs

@@ -201,8 +201,11 @@ public class PopConfirm : ContentControl
     protected override bool RegisterContentPresenter(ContentPresenter presenter)
     {
         var result = base.RegisterContentPresenter(presenter);
-        _childChangeDisposable = presenter.GetPropertyChangedObservable(ContentPresenter.ChildProperty)
+        if (result)
-                                          .Subscribe(OnChildChanged);
+        {
+            _childChangeDisposable = presenter.GetPropertyChangedObservable(ContentPresenter.ChildProperty)
+                                              .Subscribe(OnChildChanged);
+        }
         return result;
     }