feat: add DialogFocusHint attached property.

demo/Ursa.Demo/Dialogs/CustomDemoDialog.axaml

@@ -17,7 +17,10 @@
             <GradientStop Offset="0.9" Color="{DynamicResource SemiLightBlue1Color}" />
         </LinearGradientBrush>
     </UserControl.Background>
-    <Grid Margin="24" RowDefinitions="Auto, *, Auto" MinWidth="400">
+    <Grid
+        MinWidth="400"
+        Margin="24"
+        RowDefinitions="Auto, *, Auto">
         <TextBlock
             Grid.Row="0"
             Margin="8"
@@ -45,7 +48,10 @@
                 Grid.Column="1"
                 Margin="32,8,0,8"
                 Label="Owner">
-                <TextBox u:FormItem.Label="Owner" Text="{Binding Owner}" />
+                <TextBox
+                    u:FocusHelper.DialogFocusHint="True"
+                    u:FormItem.Label="Owner"
+                    Text="{Binding Owner}" />
             </u:FormItem>
             <u:FormItem
                 Grid.Row="1"
@@ -69,9 +75,20 @@
             HorizontalAlignment="Right"
             Orientation="Horizontal"
             Spacing="8">
-            <Button Command="{Binding DialogCommand}" Content="Dialog" Theme="{DynamicResource SolidButton}" />
+            <Button
-            <Button Command="{Binding OKCommand}" Content="OK" Theme="{DynamicResource SolidButton}" Classes="Tertiary"/>
+                Command="{Binding DialogCommand}"
-            <Button Command="{Binding CancelCommand}" Content="Cancel" Theme="{DynamicResource SolidButton}" Classes="Tertiary"/>
+                Content="Dialog"
+                Theme="{DynamicResource SolidButton}" />
+            <Button
+                Classes="Tertiary"
+                Command="{Binding OKCommand}"
+                Content="OK"
+                Theme="{DynamicResource SolidButton}" />
+            <Button
+                Classes="Tertiary"
+                Command="{Binding CancelCommand}"
+                Content="Cancel"
+                Theme="{DynamicResource SolidButton}" />
             <ComboBox>
                 <ComboBoxItem>A</ComboBoxItem>
                 <ComboBoxItem>B</ComboBoxItem>

src/Ursa/AssemblyInfo.cs

@@ -4,3 +4,4 @@ using Avalonia.Metadata;
 [assembly:XmlnsDefinition("https://irihi.tech/ursa", "Ursa")]
 [assembly:XmlnsDefinition("https://irihi.tech/ursa", "Ursa.Controls")]
 [assembly:XmlnsDefinition("https://irihi.tech/ursa", "Ursa.Controls.Shapes")]
+[assembly:XmlnsDefinition("https://irihi.tech/ursa", "Ursa.Helpers")]

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

@@ -4,6 +4,7 @@ using Avalonia.VisualTree;
 using Irihi.Avalonia.Shared.Helpers;
 using Irihi.Avalonia.Shared.Shapes;
 using Ursa.Controls.OverlayShared;
+using Ursa.Helpers;
 
 namespace Ursa.Controls;
 
@@ -113,12 +114,17 @@ public partial class OverlayDialogHost
         control.AddHandler(DialogControlBase.LayerChangedEvent, OnDialogLayerChanged);
         if (!IsAnimationDisabled) MaskAppearAnimation.RunAsync(mask);
 
-        var element = control.GetVisualDescendants().OfType<InputElement>().FirstOrDefault(a => a.Focusable);
+        var element = control.GetVisualDescendants().OfType<InputElement>()
+                             .FirstOrDefault(FocusHelper.GetDialogFocusHint);
+        if (element is null)
+        {
+            element = control.GetVisualDescendants().OfType<InputElement>().FirstOrDefault(a => a.Focusable);
+        }
         element?.Focus();
         _modalCount++;
         IsInModalStatus = _modalCount > 0;
         control.IsClosed = false;
-        control.Focus();
+        // control.Focus();
     }
 
     // Handle dialog layer change event

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

@@ -9,6 +9,7 @@ using Irihi.Avalonia.Shared.Shapes;
 using Ursa.Common;
 using Ursa.Controls.OverlayShared;
 using Ursa.EventArgs;
+using Ursa.Helpers;
 
 namespace Ursa.Controls;
 
@@ -69,7 +70,13 @@ public partial class OverlayDialogHost
         {
             await Task.WhenAll(animation.RunAsync(control), MaskAppearAnimation.RunAsync(mask));
         }
-        var element = control.GetVisualDescendants().OfType<InputElement>().FirstOrDefault(a => a.Focusable);
+
+        var element = control.GetVisualDescendants().OfType<InputElement>()
+                             .FirstOrDefault(FocusHelper.GetDialogFocusHint);
+        if (element is null)
+        {
+            element = control.GetVisualDescendants().OfType<InputElement>().FirstOrDefault(a => a.Focusable);
+        }
         element?.Focus();
     }
 

src/Ursa/Helpers/FocusHelper.cs

@@ -0,0 +1,13 @@
+using Avalonia;
+using Avalonia.Input;
+
+namespace Ursa.Helpers;
+
+public class FocusHelper
+{
+    public static readonly AttachedProperty<bool> DialogFocusHintProperty =
+        AvaloniaProperty.RegisterAttached<FocusHelper, InputElement, bool>("DialogFocusHint");
+
+    public static void SetDialogFocusHint(InputElement obj, bool value) => obj.SetValue(DialogFocusHintProperty, value);
+    public static bool GetDialogFocusHint(InputElement obj) => obj.GetValue(DialogFocusHintProperty);
+}