feat: make drawer impact modal count. simplify demo view model.

demo/Ursa.Demo/Pages/DialogDemo.axaml

@@ -40,21 +40,21 @@
                         OffContent="No"
                         OnContent="Yes" />
                     <StackPanel Orientation="Horizontal">
-                        <TextBlock Text="Buttons" />
+                        <TextBlock Text="Buttons" VerticalAlignment="Center" />
-                        <ComboBox ItemsSource="{Binding Buttons}" SelectedItem="{Binding SelectedButton}" />
+                        <u:EnumSelector EnumType="{x:Type u:DialogButton}" Value="{Binding SelectedButton}" />
                     </StackPanel>
                     <StackPanel Orientation="Horizontal">
-                        <TextBlock Text="Mode" />
+                        <TextBlock Text="Mode" VerticalAlignment="Center" />
-                        <ComboBox ItemsSource="{Binding Modes}" SelectedItem="{Binding SelectedMode}" />
+                        <u:EnumSelector EnumType="{x:Type u:DialogMode}" Value="{Binding SelectedMode}" />
                     </StackPanel>
                     <Button Command="{Binding ShowDialogCommand}" Content="Show Dialog" />
                     <TextBlock>
                         <Run Text="Default Result: " />
-                        <Run Text="{Binding DefaultResult}" />
+                        <Run Text="{Binding DefaultResult, FallbackValue=''}" />
                     </TextBlock>
                     <TextBlock>
                         <Run Text="Dialog Date: " />
-                        <Run Text="{Binding Date}" />
+                        <Run Text="{Binding Date, FallbackValue=''}" />
                     </TextBlock>
                 </StackPanel>
             </TabItem>
@@ -73,8 +73,8 @@
                         OffContent="Local"
                         OnContent="Global" />
                     <ToggleSwitch
-                        Content="Modal/Regular"
                         Name="modal"
+                        Content="Modal/Regular"
                         IsChecked="{Binding IsModal}"
                         OffContent="Regular"
                         OnContent="Modal" />

demo/Ursa.Demo/ViewModels/DialogDemoViewModel.cs

@@ -11,85 +11,27 @@ using Ursa.Demo.Pages;
 
 namespace Ursa.Demo.ViewModels;
 
-public class DialogDemoViewModel: ObservableObject
+public partial class DialogDemoViewModel: ObservableObject
 {
     public ICommand ShowDialogCommand { get; set; }
     public ICommand ShowCustomDialogCommand { get; set; }
 
-    private DialogMode _selectedMode;
+    [ObservableProperty] private DialogMode _selectedMode;
-    public DialogMode SelectedMode
+    [ObservableProperty] private DialogButton _selectedButton;
-    {
+    [ObservableProperty] private bool _isWindow;
-        get => _selectedMode;
+    [ObservableProperty] private bool _isGlobal;
-        set => SetProperty(ref _selectedMode, value);
+    [ObservableProperty] private bool _isModal;
-    }
+    [ObservableProperty] private bool _canLightDismiss;
-    
+    [ObservableProperty] private DialogResult? _defaultResult;
-    public ObservableCollection<DialogMode> Modes { get; set; }
+    [ObservableProperty] private bool _result;
-    
+    [ObservableProperty] private DateTime? _date;
-    private DialogButton _selectedButton;
-    public DialogButton SelectedButton
-    {
-        get => _selectedButton;
-        set => SetProperty(ref _selectedButton, value);
-    }
-    
-    public ObservableCollection<DialogButton> Buttons { get; set; }
-
-    private bool _isWindow;
-    public bool IsWindow
-    {
-        get => _isWindow;
-        set => SetProperty(ref _isWindow, value);
-    }
-    
-    private bool _isGlobal;
-    public bool IsGlobal
-    {
-        get => _isGlobal;
-        set => SetProperty(ref _isGlobal, value);
-    }
-
-    private bool _isModal;
-    public bool IsModal
-    {
-        get => _isModal;
-        set => SetProperty(ref _isModal, value);
-    }
-    
-    private bool _canLightDismiss;
-    public bool CanLightDismiss
-    {
-        get => _canLightDismiss;
-        set => SetProperty(ref _canLightDismiss, value);
-    }
-
-    private DialogResult? _defaultResult;
-    public DialogResult? DefaultResult
-    {
-        get => _defaultResult;
-        set => SetProperty(ref _defaultResult, value);
-    }
-
-    private bool _result;
-    public bool Result
-    {
-        get => _result;
-        set => SetProperty(ref _result, value);
-    }
-
-    private DateTime? _date;
-    public DateTime? Date
-    {
-        get => _date;
-        set => SetProperty(ref _date, value);
-    }
-    
     
     public DialogDemoViewModel()
     {
         ShowDialogCommand = new AsyncRelayCommand(ShowDialog);
         ShowCustomDialogCommand = new AsyncRelayCommand(ShowCustomDialog);
-        Modes = new ObservableCollection<DialogMode>(Enum.GetValues<DialogMode>());
+        IsModal = true;
-        Buttons = new ObservableCollection<DialogButton>(Enum.GetValues<DialogButton>());
+        IsGlobal = true;
     }
     
     private async Task ShowDialog()
@@ -149,7 +91,6 @@ public class DialogDemoViewModel: ObservableObject
         var vm = new DialogWithActionViewModel();
         if (IsWindow)
         {
-
             if (IsModal)
             {
                 Result = await Dialog.ShowCustomModal<DialogWithAction, DialogWithActionViewModel, bool>(
@@ -161,7 +102,6 @@ public class DialogDemoViewModel: ObservableObject
                 Dialog.ShowCustom<DialogWithAction, DialogWithActionViewModel>(
                     vm);
             }
-            
         }
         else
         {

demo/Ursa.Demo/ViewModels/DrawerDemoViewModel.cs

@@ -31,6 +31,9 @@ public partial class DrawerDemoViewModel: ObservableObject
     {
         ShowDialogCommand = new AsyncRelayCommand(ShowDefaultDialog);
         ShowCustomDialogCommand = new AsyncRelayCommand(ShowCustomDrawer);
+        SelectedPosition = Position.Right;
+        IsGlobal = true;
+        IsModal = true;
     }
     
     private async Task ShowDefaultDialog()

src/Ursa/Controls/OverlayShared/OverlayDialogHost.Drawer.cs

@@ -48,6 +48,8 @@ public partial class OverlayDialogHost
         control.Measure(this.Bounds.Size);
         control.Arrange(new Rect(control.DesiredSize));
         SetDrawerPosition(control);
+        _modalCount++;
+        HasModal = _modalCount > 0;
         control.AddHandler(OverlayFeedbackElement.ClosedEvent, OnDrawerControlClosing);
         var animation = CreateAnimation(control.Bounds.Size, control.Position);
         await Task.WhenAll(animation.RunAsync(control), _maskAppearAnimation.RunAsync(mask));
@@ -145,10 +147,13 @@ public partial class OverlayDialogHost
             control.RemoveHandler(DialogControlBase.LayerChangedEvent, OnDialogLayerChanged); 
             if (layer.Mask is not null)
             {
+                _modalCount--;
+                HasModal = _modalCount > 0;
                 layer.Mask.RemoveHandler(PointerPressedEvent, ClickMaskToCloseDialog);
                 var disappearAnimation = CreateAnimation(control.Bounds.Size, control.Position, false);
                 await Task.WhenAll(disappearAnimation.RunAsync(control), _maskDisappearAnimation.RunAsync(layer.Mask));
                 Children.Remove(layer.Mask);
+                
             }
             else
             {