Add basic replacement functionality- replacing adds multiple copies on child actors, however.

Source/Editor/CustomEditors/Dedicated/MissingScriptEditor.cs

@@ -1,6 +1,13 @@
-using FlaxEditor.CustomEditors.Editors;
+using FlaxEditor.Actions;
+using FlaxEditor.CustomEditors.Editors;
+using FlaxEditor.CustomEditors.GUI;
+using FlaxEditor.GUI;
+using FlaxEditor.GUI.ContextMenu;
+using FlaxEditor.Scripting;
 using FlaxEngine;
 using FlaxEngine.GUI;
+using System;
+using System.Collections.Generic;
 
 namespace FlaxEditor.CustomEditors.Dedicated;
 
@@ -10,6 +17,11 @@ namespace FlaxEditor.CustomEditors.Dedicated;
 [CustomEditor(typeof(MissingScript)), DefaultEditor]
 public class MissingScriptEditor : GenericEditor
 {
+    DropPanel _dropPanel;
+    Button _replaceScriptButton;
+    CheckBox _shouldReplaceAllCheckbox;
+    CustomEditor _propertiesEditor;
+
     /// <inheritdoc />
     public override void Initialize(LayoutElementsContainer layout)
     {
@@ -18,9 +30,150 @@ public class MissingScriptEditor : GenericEditor
             base.Initialize(layout);
             return;
         }
+        _dropPanel = dropPanel;
+        _dropPanel.HeaderTextColor = Color.OrangeRed;
 
-        dropPanel.HeaderTextColor = Color.OrangeRed;
+        Panel replaceScriptPanel = new Panel
+        {
+            Parent = _dropPanel,
+            Height = 64,
+        };
+
+        _replaceScriptButton = new Button
+        {
+            Text = "Replace Script",
+            AnchorPreset = AnchorPresets.TopCenter,
+            Width = 240,
+            Height = 24,
+            X = -120,
+            Y = 0,
+            Parent = replaceScriptPanel,
+        };
+        _replaceScriptButton.Clicked += OnReplaceScriptButtonClicked;
+
+        Label replaceAllLabel = new Label
+        {
+            Text = "Replace All of Same Type",
+            AnchorPreset = AnchorPresets.BottomCenter,
+            Y = -34,
+            Parent = replaceScriptPanel,
+        };
+        replaceAllLabel.X -= FlaxEngine.GUI.Style.Current.FontSmall.MeasureText(replaceAllLabel.Text).X;
+
+        _shouldReplaceAllCheckbox = new CheckBox
+        {
+            TooltipText = "Wether or not to apply this script change to all scripts missing the same type.",
+            AnchorPreset = AnchorPresets.BottomCenter,
+            Y = -34,
+            Parent = replaceScriptPanel,
+        };
+
+        float centerDifference = (_shouldReplaceAllCheckbox.Right - replaceAllLabel.Left) / 2;
+        replaceAllLabel.X += centerDifference;
+        _shouldReplaceAllCheckbox.X += centerDifference;
 
         base.Initialize(layout);
     }
+
+    private List<MissingScript> FindActorsWithMatchingMissingScript(Actor parent = null)
+    {
+        List<MissingScript> missingScripts = new List<MissingScript>();
+        if (parent != null)
+        {
+            for (int child = 0; child < parent.ChildrenCount; child++)
+            {
+                Actor actor = parent.Children[child];
+                for (int scriptIndex = 0; scriptIndex < actor.ScriptsCount; scriptIndex++)
+                {
+                    Script actorScript = actor.Scripts[scriptIndex];
+                    if (actorScript is not MissingScript missingActorScript)
+                    {
+                        continue;
+                    }
+
+                    MissingScript currentMissing = Values[0] as MissingScript;
+                    if (missingActorScript.MissingTypeName != currentMissing.MissingTypeName)
+                    {
+                        continue;
+                    }
+
+                    Debug.Log("Found correct missing script.");
+
+                    // Matching MissingScript.
+                    missingScripts.Add(missingActorScript);
+                }
+
+                missingScripts.AddRange(FindActorsWithMatchingMissingScript(actor));
+            }
+        } else
+        {
+            foreach (Actor actor in Level.GetActors<Actor>())
+            {
+                missingScripts.AddRange(FindActorsWithMatchingMissingScript(actor));
+            }
+        }
+
+        return missingScripts;
+    }
+
+    private void ReplaceScript(ScriptType script, bool replaceAllInScene)
+    {
+        var actions = new List<IUndoAction>(4);
+
+        List<MissingScript> missingScripts = new List<MissingScript>();
+        if (!replaceAllInScene)
+        {
+            missingScripts.Add(Values[0] as MissingScript);
+        } else
+        {
+            missingScripts.AddRange(FindActorsWithMatchingMissingScript());
+        }
+
+        foreach (MissingScript missingScript in missingScripts)
+        {
+            actions.Add(AddRemoveScript.Add(missingScript.Actor, script));
+            actions.Add(AddRemoveScript.Remove(missingScript));
+        }
+
+        if (actions.Count == 0)
+        {
+            Editor.LogWarning("Failed to replace scripts!");
+            return;
+        }
+
+        var multiAction = new MultiUndoAction(actions);
+        multiAction.Do();
+        var presenter = ParentEditor.Presenter;
+        if (presenter != null)
+        {
+            presenter.Undo.AddAction(multiAction);
+            presenter.Control.Focus();
+        }
+    }
+
+    private void OnReplaceScriptButtonClicked()
+    {
+        var scripts = Editor.Instance.CodeEditing.Scripts.Get();
+        if (scripts.Count == 0)
+        {
+            // No scripts
+            var cm1 = new ContextMenu();
+            cm1.AddButton("No scripts in project");
+            cm1.Show(_dropPanel, _replaceScriptButton.BottomLeft);
+            return;
+        }
+
+        // Show context menu with list of scripts to add
+        var cm = new ItemsListContextMenu(180);
+        for (int i = 0; i < scripts.Count; i++)
+        {
+            cm.AddItem(new TypeSearchPopup.TypeItemView(scripts[i]));
+        }
+        // Get the parent (actor properties editor) of the parent (Scripts Editor) of our editor.
+        _propertiesEditor = ParentEditor.ParentEditor;
+
+        cm.ItemClicked += item => ReplaceScript((ScriptType)item.Tag, _shouldReplaceAllCheckbox.Checked);
+        cm.SortItems();
+        cm.Show(_dropPanel, _replaceScriptButton.BottomLeft - new Float2((cm.Width - _replaceScriptButton.Width) / 2, 0));
+    }
 }