From fb746806261853849d82959b3370db9a0688329a Mon Sep 17 00:00:00 2001
From: Skirlez <skirlez3@gmail.com>
Date: Thu, 24 Oct 2024 11:53:15 +0300
Subject: [PATCH] Added CanDragInto property to UndertaleObjectReference

---
 .../Controls/UndertaleObjectReference.xaml    |  6 ++--
 .../Controls/UndertaleObjectReference.xaml.cs | 29 ++++++++++++++-----
 .../Editors/UndertaleCodeEditor.xaml          |  2 +-
 3 files changed, 27 insertions(+), 10 deletions(-)

diff --git a/UndertaleModTool/Controls/UndertaleObjectReference.xaml b/UndertaleModTool/Controls/UndertaleObjectReference.xaml
index 43db49af2..ea1df856f 100644
--- a/UndertaleModTool/Controls/UndertaleObjectReference.xaml
+++ b/UndertaleModTool/Controls/UndertaleObjectReference.xaml
@@ -22,13 +22,15 @@
             <ColumnDefinition Width="Auto"/>
         </Grid.ColumnDefinitions>
         <local:TextBoxDark Grid.Column="0" x:Name="ObjectText" IsReadOnly="True" Cursor="Arrow" AllowDrop="True"
-                           ToolTip="This is an object reference. Drag and drop an object of matching type from the tree on the left to change it!"
-                           ToolTipService.InitialShowDelay="250"
                            PreviewDragOver="TextBox_DragOver" PreviewDrop="TextBox_Drop" PreviewMouseDoubleClick="TextBox_MouseDoubleClick" PreviewMouseDown="Details_MouseDown"
                            Text="{Binding ObjectReference, ElementName=objectReference}">
             <TextBox.Style>
                 <Style TargetType="{x:Type TextBox}">
                     <Style.Triggers>
+                        <DataTrigger Binding="{Binding CanDragInto, ElementName=objectReference}" Value="True">
+                            <Setter Property="ToolTip" Value="This is an object reference. Drag and drop an object of matching type from the tree on the left to change it!" />
+                            <Setter Property="ToolTipService.InitialShowDelay" Value="250" />
+                        </DataTrigger>
                         <DataTrigger Binding="{Binding ObjectReference, ElementName=objectReference}" Value="{x:Null}">
                             <Setter Property="Background">
                                 <Setter.Value>
diff --git a/UndertaleModTool/Controls/UndertaleObjectReference.xaml.cs b/UndertaleModTool/Controls/UndertaleObjectReference.xaml.cs
index 24e8812be..73a2307f1 100644
--- a/UndertaleModTool/Controls/UndertaleObjectReference.xaml.cs
+++ b/UndertaleModTool/Controls/UndertaleObjectReference.xaml.cs
@@ -66,7 +66,13 @@ public partial class UndertaleObjectReference : UserControl
                 typeof(UndertaleObjectReference),
                 new FrameworkPropertyMetadata(true,
                     FrameworkPropertyMetadataOptions.BindsTwoWayByDefault));
-
+					
+        public static DependencyProperty CanDragIntoProperty =
+            DependencyProperty.Register("CanDragInto", typeof(bool),
+                typeof(UndertaleObjectReference),
+                new FrameworkPropertyMetadata(true,
+                    FrameworkPropertyMetadataOptions.BindsTwoWayByDefault));
+				
         public static DependencyProperty ObjectEventTypeProperty =
             DependencyProperty.Register("ObjectEventType", typeof(EventType),
                 typeof(UndertaleObjectReference),
@@ -94,8 +100,14 @@ public Type ObjectType
 
         public bool CanRemove
         {
-            get { return (bool)GetValue(ObjectTypeProperty); }
-            set { SetValue(ObjectTypeProperty, value); }
+            get { return (bool)GetValue(CanRemoveProperty); }
+            set { SetValue(CanRemoveProperty, value); }
+        }
+
+        public bool CanDragInto
+        {
+            get { return (bool)GetValue(CanDragIntoProperty); }
+            set { SetValue(CanDragIntoProperty, value); }
         }
 
         public EventType ObjectEventType
@@ -136,8 +148,11 @@ private void UndertaleObjectReference_Loaded(object sender, RoutedEventArgs e)
             // If the first letter is a vowel
             if (Array.IndexOf(vowels, typeName[0]) != -1)
                 n = "n";
-                
-            label.Content = $"(drag & drop a{n} {typeName})";
+
+            if (CanDragInto)
+                label.Content = $"(drag & drop a{n} {typeName})";
+            else
+                label.Content = $"(empty {typeName} reference)";
         }
 
         public void ClearRemoveClickHandler()
@@ -244,7 +259,7 @@ private void TextBox_DragOver(object sender, DragEventArgs e)
         {
             UndertaleObject sourceItem = e.Data.GetData(e.Data.GetFormats()[0]) as UndertaleObject;
 
-            e.Effects = e.AllowedEffects.HasFlag(DragDropEffects.Link) && sourceItem != null && sourceItem.GetType() == ObjectType ? DragDropEffects.Link : DragDropEffects.None;
+            e.Effects = e.AllowedEffects.HasFlag(DragDropEffects.Link) && sourceItem != null && CanDragInto && sourceItem.GetType() == ObjectType ? DragDropEffects.Link : DragDropEffects.None;
             e.Handled = true;
         }
 
@@ -252,7 +267,7 @@ private void TextBox_Drop(object sender, DragEventArgs e)
         {
             UndertaleObject sourceItem = e.Data.GetData(e.Data.GetFormats()[0]) as UndertaleObject;
 
-            e.Effects = e.AllowedEffects.HasFlag(DragDropEffects.Link) && sourceItem != null && sourceItem.GetType() == ObjectType ? DragDropEffects.Link : DragDropEffects.None;
+            e.Effects = e.AllowedEffects.HasFlag(DragDropEffects.Link) && sourceItem != null && CanDragInto && sourceItem.GetType() == ObjectType ? DragDropEffects.Link : DragDropEffects.None;
             if (e.Effects == DragDropEffects.Link)
             {
                 ObjectReference = sourceItem;
diff --git a/UndertaleModTool/Editors/UndertaleCodeEditor.xaml b/UndertaleModTool/Editors/UndertaleCodeEditor.xaml
index 65565aedf..834f88849 100644
--- a/UndertaleModTool/Editors/UndertaleCodeEditor.xaml
+++ b/UndertaleModTool/Editors/UndertaleCodeEditor.xaml
@@ -44,7 +44,7 @@
         <local:TextBoxDark Grid.Row="3" Grid.Column="1" Margin="3" Text="{Binding Offset}"/>
 
         <TextBlock Grid.Row="4" Grid.Column="0" Margin="3" Visibility="{Binding ParentEntry, Converter={StaticResource VisibleIfNotNull}}">Parent entry</TextBlock>
-        <local:UndertaleObjectReference Grid.Row="4" Grid.Column="1" Margin="3" Visibility="{Binding ParentEntry, Converter={StaticResource VisibleIfNotNull}}" ObjectReference="{Binding ParentEntry}" ObjectType="{x:Type undertale:UndertaleCode}" CanRemove="False"/>
+        <local:UndertaleObjectReference Grid.Row="4" Grid.Column="1" Margin="3" Visibility="{Binding ParentEntry, Converter={StaticResource VisibleIfNotNull}}" ObjectReference="{Binding ParentEntry}" ObjectType="{x:Type undertale:UndertaleCode}" CanRemove="False" CanDragInto="False"/>
 
         <TabControl x:Name="CodeModeTabs" Grid.Row="5" Grid.Column="0" Grid.ColumnSpan="2" SelectionChanged="TabControl_SelectionChanged">
             <TabItem Header="Decompiled" Name="DecompiledTab">