From 9a34ce26204c200f8e38175c6c373687f5890faf Mon Sep 17 00:00:00 2001
From: rabbitism <popmessiah@hotmail.com>
Date: Thu, 8 Feb 2024 23:44:02 +0800
Subject: [PATCH] feat: add a property to show if there is modal dialog
 available in a host.

---
 demo/Ursa.Demo/Views/MainView.axaml           | 160 +++++++++---------
 .../OverlayShared/OverlayDialogHost.Dialog.cs |   9 +-
 .../OverlayShared/OverlayDialogHost.Shared.cs |  17 +-
 3 files changed, 108 insertions(+), 78 deletions(-)

diff --git a/demo/Ursa.Demo/Views/MainView.axaml b/demo/Ursa.Demo/Views/MainView.axaml
index 31d58a1..956dbe4 100644
--- a/demo/Ursa.Demo/Views/MainView.axaml
+++ b/demo/Ursa.Demo/Views/MainView.axaml
@@ -16,81 +16,89 @@
     <Design.DataContext>
         <vm:MainViewViewModel />
     </Design.DataContext>
+    <Panel>
+        <Grid
+            Classes.Blur="{Binding #host.HasModal}"
+            ColumnDefinitions="Auto, *"
+            RowDefinitions="Auto, *">
+            <Grid.Styles>
+                <Style Selector="Grid.Blur">
+                    <Setter Property="Effect" Value="blur(20)" />
+                </Style>
+            </Grid.Styles>
+            <Border
+                Grid.RowSpan="2"
+                Padding="8,4"
+                VerticalAlignment="Stretch"
+                Theme="{DynamicResource CardBorder}">
+                <u:NavigationMenu ItemsSource="{Binding Menus.MenuItems}" ShowCollapseButton="True">
+                    <u:NavigationMenu.Header>
+                        <TextBlock
+                            Classes="H4"
+                            Text="Ursa"
+                            Theme="{DynamicResource TitleTextBlock}" />
+                    </u:NavigationMenu.Header>
+                    <u:NavigationMenu.Icon>
+                        <Image
+                            Width="48"
+                            Height="48"
+                            RenderOptions.BitmapInterpolationMode="HighQuality"
+                            Source="../Assets/Ursa.ico" />
+                    </u:NavigationMenu.Icon>
+                    <u:NavigationMenu.ItemTemplate>
+                        <converters:MenuDataTemplateSelector>
+                            <converters:MenuDataTemplateSelector.MenuTemplate>
+                                <DataTemplate DataType="vm:MenuItemViewModel">
+                                    <u:NavigationMenuItem
+                                        Command="{Binding ActivateCommand}"
+                                        Header="{Binding}"
+                                        ItemsSource="{Binding Children}">
+                                        <u:NavigationMenuItem.HeaderTemplate>
+                                            <DataTemplate x:DataType="vm:MenuItemViewModel">
+                                                <StackPanel Orientation="Horizontal">
+                                                    <TextBlock HorizontalAlignment="Left" Text="{Binding MenuHeader}" />
+                                                    <u:Badge
+                                                        Margin="8,0,0,0"
+                                                        HorizontalAlignment="Left"
+                                                        BadgeContent="{Binding Status}"
+                                                        CornerPosition="TopRight" />
+                                                </StackPanel>
 
-    <Grid ColumnDefinitions="Auto, *" RowDefinitions="Auto, *">
-        <Border
-            Grid.RowSpan="2"
-            Padding="8,4"
-            VerticalAlignment="Stretch"
-            Theme="{DynamicResource CardBorder}">
-            <u:NavigationMenu ItemsSource="{Binding Menus.MenuItems}" ShowCollapseButton="True">
-                <u:NavigationMenu.Header>
-                    <TextBlock
-                        Classes="H4"
-                        Text="Ursa"
-                        Theme="{DynamicResource TitleTextBlock}" />
-                </u:NavigationMenu.Header>
-                <u:NavigationMenu.Icon>
-                    <Image
-                        Width="48"
-                        Height="48"
-                        RenderOptions.BitmapInterpolationMode="HighQuality"
-                        Source="../Assets/Ursa.ico" />
-                </u:NavigationMenu.Icon>
-                <u:NavigationMenu.ItemTemplate>
-                    <converters:MenuDataTemplateSelector>
-                        <converters:MenuDataTemplateSelector.MenuTemplate>
-                            <DataTemplate DataType="vm:MenuItemViewModel">
-                                <u:NavigationMenuItem
-                                    Command="{Binding ActivateCommand}"
-                                    Header="{Binding}"
-                                    ItemsSource="{Binding Children}">
-                                    <u:NavigationMenuItem.HeaderTemplate>
-                                        <DataTemplate x:DataType="vm:MenuItemViewModel">
-                                            <StackPanel Orientation="Horizontal">
-                                                <TextBlock HorizontalAlignment="Left" Text="{Binding MenuHeader}" />
-                                                <u:Badge
-                                                    Margin="8,0,0,0"
-                                                    HorizontalAlignment="Left"
-                                                    BadgeContent="{Binding Status}"
-                                                    CornerPosition="TopRight" />
-                                            </StackPanel>
-
-                                        </DataTemplate>
-                                    </u:NavigationMenuItem.HeaderTemplate>
-                                    <u:NavigationMenuItem.Icon>
-                                        <Border
-                                            Width="10"
-                                            Height="10"
-                                            Background="{DynamicResource SemiBlue6}"
-                                            CornerRadius="3" />
-                                    </u:NavigationMenuItem.Icon>
-                                </u:NavigationMenuItem>
-                            </DataTemplate>
-                        </converters:MenuDataTemplateSelector.MenuTemplate>
-                        <converters:MenuDataTemplateSelector.SeparatorTemplate>
-                            <DataTemplate DataType="vm:MenuItemViewModel">
-                                <u:NavigationMenuSeparator Header="{Binding MenuHeader}" />
-                            </DataTemplate>
-                        </converters:MenuDataTemplateSelector.SeparatorTemplate>
-                    </converters:MenuDataTemplateSelector>
-                </u:NavigationMenu.ItemTemplate>
-            </u:NavigationMenu>
-        </Border>
-        <u:ThemeToggleButton
-            Grid.Row="0"
-            Grid.Column="1"
-            HorizontalAlignment="Right"/>
-        <ContentControl
-            Grid.Row="1"
-            Grid.Column="1"
-            Margin="12"
-            Content="{Binding Content}">
-            <ContentControl.ContentTemplate>
-                <converters:ViewLocator />
-            </ContentControl.ContentTemplate>
-        </ContentControl>
-        <u:OverlayDialogHost Grid.Row="0" Grid.Column="0" Grid.RowSpan="2" Grid.ColumnSpan="2" SnapThickness="20"/>
-    </Grid>
-
+                                            </DataTemplate>
+                                        </u:NavigationMenuItem.HeaderTemplate>
+                                        <u:NavigationMenuItem.Icon>
+                                            <Border
+                                                Width="10"
+                                                Height="10"
+                                                Background="{DynamicResource SemiBlue6}"
+                                                CornerRadius="3" />
+                                        </u:NavigationMenuItem.Icon>
+                                    </u:NavigationMenuItem>
+                                </DataTemplate>
+                            </converters:MenuDataTemplateSelector.MenuTemplate>
+                            <converters:MenuDataTemplateSelector.SeparatorTemplate>
+                                <DataTemplate DataType="vm:MenuItemViewModel">
+                                    <u:NavigationMenuSeparator Header="{Binding MenuHeader}" />
+                                </DataTemplate>
+                            </converters:MenuDataTemplateSelector.SeparatorTemplate>
+                        </converters:MenuDataTemplateSelector>
+                    </u:NavigationMenu.ItemTemplate>
+                </u:NavigationMenu>
+            </Border>
+            <u:ThemeToggleButton
+                Grid.Row="0"
+                Grid.Column="1"
+                HorizontalAlignment="Right" />
+            <ContentControl
+                Grid.Row="1"
+                Grid.Column="1"
+                Margin="12"
+                Content="{Binding Content}">
+                <ContentControl.ContentTemplate>
+                    <converters:ViewLocator />
+                </ContentControl.ContentTemplate>
+            </ContentControl>
+        </Grid>
+        <u:OverlayDialogHost Name="host" SnapThickness="20" />
+    </Panel>
 </UserControl>
diff --git a/src/Ursa/Controls/OverlayShared/OverlayDialogHost.Dialog.cs b/src/Ursa/Controls/OverlayShared/OverlayDialogHost.Dialog.cs
index f1aa68f..ddb3342 100644
--- a/src/Ursa/Controls/OverlayShared/OverlayDialogHost.Dialog.cs
+++ b/src/Ursa/Controls/OverlayShared/OverlayDialogHost.Dialog.cs
@@ -92,7 +92,7 @@ public partial class OverlayDialogHost
             Children.Add(mask);
         }
         this.Children.Add(control);
-        _layers.Add(new DialogPair(mask, control));
+        _layers.Add(new DialogPair(mask, control, false));
         control.Measure(this.Bounds.Size);
         control.Arrange(new Rect(control.DesiredSize));
         SetToPosition(control);
@@ -118,6 +118,11 @@ public partial class OverlayDialogHost
             {
                 await _maskDisappearAnimation.RunAsync(layer.Mask);
                 Children.Remove(layer.Mask);
+                if (layer.Modal)
+                {
+                    _modalCount--;
+                    HasModal = _modalCount > 0;
+                }
             }
             
             ResetZIndices();
@@ -142,6 +147,8 @@ public partial class OverlayDialogHost
         control.AddHandler(OverlayFeedbackElement.ClosedEvent, OnDialogControlClosing);
         control.AddHandler(DialogControlBase.LayerChangedEvent, OnDialogLayerChanged);
         _maskAppearAnimation.RunAsync(mask);
+        _modalCount++;
+        HasModal = _modalCount > 0;
         control.IsClosed = false;
     }
 
diff --git a/src/Ursa/Controls/OverlayShared/OverlayDialogHost.Shared.cs b/src/Ursa/Controls/OverlayShared/OverlayDialogHost.Shared.cs
index 6296a27..0e90afe 100644
--- a/src/Ursa/Controls/OverlayShared/OverlayDialogHost.Shared.cs
+++ b/src/Ursa/Controls/OverlayShared/OverlayDialogHost.Shared.cs
@@ -24,13 +24,28 @@ public partial class OverlayDialogHost: Canvas
     {
         internal PureRectangle? Mask;
         internal OverlayFeedbackElement Element;
+        internal bool Modal;
 
-        public DialogPair(PureRectangle? mask, OverlayFeedbackElement element)
+        public DialogPair(PureRectangle? mask, OverlayFeedbackElement element, bool modal = true)
         {
             Mask = mask;
             Element = element;
+            Modal = modal;
         }
     }
+
+    private int _modalCount = 0;
+    
+    
+
+    public static readonly DirectProperty<OverlayDialogHost, bool> HasModalProperty = AvaloniaProperty.RegisterDirect<OverlayDialogHost, bool>(
+        nameof(HasModal), o => o.HasModal);
+    private bool _hasModal;
+    public bool HasModal
+    {
+        get => _hasModal;
+        private set => SetAndRaise(HasModalProperty, ref _hasModal, value);
+    }
     
     static OverlayDialogHost()
     {