From 49e6bbe8b088da9c1defc8d5ae3eb8278205a951 Mon Sep 17 00:00:00 2001
From: Misaki <misaki_39@outlook.com>
Date: Sat, 28 Mar 2026 13:32:29 +0900
Subject: [PATCH] feat(dock): add visual drop target overlay

---
 src/Editor/Ghost.Editor/View/Controls/DockLayout.cs   |  5 +++++
 src/Editor/Ghost.Editor/View/Controls/DockLayout.xaml | 10 +++++++++-
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/src/Editor/Ghost.Editor/View/Controls/DockLayout.cs b/src/Editor/Ghost.Editor/View/Controls/DockLayout.cs
index b247394..60e6848 100644
--- a/src/Editor/Ghost.Editor/View/Controls/DockLayout.cs
+++ b/src/Editor/Ghost.Editor/View/Controls/DockLayout.cs
@@ -15,11 +15,15 @@ namespace Ghost.Editor.View.Controls;
 public sealed partial class DockLayout : Control
 {
     private const string PART_ROOT_GRID = "PART_RootGrid";
+    private const string PART_DROP_TARGET_OVERLAY = "PART_DropTargetOverlay";
     private const double MIN_PANE_SIZE = 100;
     private const double SPLITTER_THICKNESS = 4;
 
+    private Border? _dropTargetOverlay;
     private readonly HashSet<DockNode> _subscribedNodes = new();
 
+    public enum DockPosition { Center, Top, Bottom, Left, Right, None }
+
     public DockLayout()
     {
         DefaultStyleKey = typeof(DockLayout);
@@ -287,6 +291,7 @@ public sealed partial class DockLayout : Control
     protected override void OnApplyTemplate()
     {
         base.OnApplyTemplate();
+        _dropTargetOverlay = GetTemplateChild(PART_DROP_TARGET_OVERLAY) as Border;
         RenderTree();
     }
 }
diff --git a/src/Editor/Ghost.Editor/View/Controls/DockLayout.xaml b/src/Editor/Ghost.Editor/View/Controls/DockLayout.xaml
index 5e97212..c67f56c 100644
--- a/src/Editor/Ghost.Editor/View/Controls/DockLayout.xaml
+++ b/src/Editor/Ghost.Editor/View/Controls/DockLayout.xaml
@@ -7,7 +7,15 @@
         <Setter Property="Template">
             <Setter.Value>
                 <ControlTemplate TargetType="local:DockLayout">
-                    <Grid x:Name="PART_RootGrid" Background="{ThemeResource ApplicationPageBackgroundThemeBrush}" />
+                    <Grid>
+                        <Grid x:Name="PART_RootGrid" Background="{ThemeResource ApplicationPageBackgroundThemeBrush}" />
+                        <Border x:Name="PART_DropTargetOverlay" 
+                                Background="#660078D4" 
+                                BorderBrush="#FF0078D4" 
+                                BorderThickness="2" 
+                                Visibility="Collapsed" 
+                                IsHitTestVisible="False" />
+                    </Grid>
                 </ControlTemplate>
             </Setter.Value>
         </Setter>