From fa949af09691053c0033e0c2422cb2933642c5fb Mon Sep 17 00:00:00 2001
From: SKProCH <skproch@yandex.ru>
Date: Thu, 26 Mar 2026 18:51:11 +0300
Subject: [PATCH] Make BoxShadow customizable via attached property

Fixes #102
---
 DialogHost.Avalonia/DialogHost.axaml   |  3 ++-
 DialogHost.Avalonia/DialogHostStyle.cs | 25 +++++++++++++++++++++++++
 2 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/DialogHost.Avalonia/DialogHost.axaml b/DialogHost.Avalonia/DialogHost.axaml
index 547df67..2616611 100644
--- a/DialogHost.Avalonia/DialogHost.axaml
+++ b/DialogHost.Avalonia/DialogHost.axaml
@@ -29,6 +29,7 @@
     <Setter Property="Background" Value="{DynamicResource DialogHostBackgroundMixinBrush}" />
     <Setter Property="dialogHostAvalonia:DialogHostStyle.ClipToBounds" Value="False" />
     <Setter Property="dialogHostAvalonia:DialogHostStyle.CornerRadius" Value="2" />
+    <Setter Property="dialogHostAvalonia:DialogHostStyle.BoxShadow" Value="1.5 1.5 8 #4c000000" />
     <Setter Property="Template">
       <ControlTemplate>
         <Panel Name="PART_DialogHostRoot" Focusable="False">
@@ -56,7 +57,7 @@
                 BorderBrush="{Binding Path=(dialogHostAvalonia:DialogHostStyle.BorderBrush), RelativeSource={RelativeSource FindAncestor, AncestorType=dialogHostAvalonia:DialogHost}}"
                 BorderThickness="{Binding Path=(dialogHostAvalonia:DialogHostStyle.BorderThickness), RelativeSource={RelativeSource FindAncestor, AncestorType=dialogHostAvalonia:DialogHost}}"
                 CornerRadius="{Binding Path=(dialogHostAvalonia:DialogHostStyle.CornerRadius), RelativeSource={RelativeSource FindAncestor, AncestorType=dialogHostAvalonia:DialogHost}}"
-                BoxShadow="1.5 1.5 8 #4c000000"
+                BoxShadow="{Binding Path=(dialogHostAvalonia:DialogHostStyle.BoxShadow), RelativeSource={RelativeSource FindAncestor, AncestorType=dialogHostAvalonia:DialogHost}}"
                 ClipToBounds="{Binding Path=(dialogHostAvalonia:DialogHostStyle.ClipToBounds), RelativeSource={RelativeSource FindAncestor, AncestorType=dialogHostAvalonia:DialogHost}}"
                 Background="{Binding Path=Background, RelativeSource={RelativeSource FindAncestor, AncestorType=dialogHostAvalonia:DialogHost}}">
           <ContentPresenter Name="PART_ContentPresenter"
diff --git a/DialogHost.Avalonia/DialogHostStyle.cs b/DialogHost.Avalonia/DialogHostStyle.cs
index 24b4c92..7af8abf 100644
--- a/DialogHost.Avalonia/DialogHostStyle.cs
+++ b/DialogHost.Avalonia/DialogHostStyle.cs
@@ -35,6 +35,13 @@ public static class DialogHostStyle {
     public static readonly AttachedProperty<Thickness> BorderThicknessProperty =
         AvaloniaProperty.RegisterAttached<DialogHost, Thickness>("BorderThickness", typeof(DialogHostStyle));
 
+    /// <summary>
+    /// Controls BoxShadow DialogHost's popup background.
+    /// Works only for default DialogHost theme!
+    /// </summary>
+    public static readonly AttachedProperty<BoxShadows> BoxShadowProperty =
+        AvaloniaProperty.RegisterAttached<DialogHost, BoxShadows>("BoxShadow", typeof(DialogHostStyle));
+
     /// <summary>
     /// Get CornerRadius in DialogHost's popup background.
     /// Works only for default DialogHost theme!
@@ -88,4 +95,22 @@ public static void SetBorderThickness(DialogHost element, Thickness value)
     {
         element.SetValue(BorderThicknessProperty, value);
     }
+
+    /// <summary>
+    /// Get BoxShadow in DialogHost's popup background.
+    /// Works only for default DialogHost theme!
+    /// </summary>
+    public static BoxShadows GetBoxShadow(DialogHost element)
+    {
+        return element.GetValue(BoxShadowProperty);
+    }
+
+    /// <summary>
+    /// Set BoxShadow in DialogHost's popup background.
+    /// Works only for default DialogHost theme!
+    /// </summary>
+    public static void SetBoxShadow(DialogHost element, BoxShadows value)
+    {
+        element.SetValue(BoxShadowProperty, value);
+    }
 }
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