Fold/unfold gameobject from code

Question

Is there some way to do something like

 Selection.unfold = true;

Or something like that? I basically want to, in code, unfold my currently selected gameobject (it would have children of course).

Cheers!

Answer 1

Best Answer

Answer by vexe · Mar 06, 2014 at 09:33 AM

Here you go :)

 public static void Collapse(GameObject go, bool collapse)
 {
     // bail out immediately if the go doesn't have children
     if (go.transform.childCount == 0) return;

     // get a reference to the hierarchy window
     var hierarchy = GetFocusedWindow("Hierarchy");

     // select our go
     SelectObject(go);

     // create a new key event (RightArrow for collapsing, LeftArrow for folding)
     var key = new Event { keyCode = collapse ? KeyCode.RightArrow : KeyCode.LeftArrow, type = EventType.keyDown };

     // finally, send the window the event
     hierarchy.SendEvent(key);
 }

 public static void SelectObject(Object obj)
 {
     Selection.activeObject = obj;
 }

 public static EditorWindow GetFocusedWindow(string window)
 {
     FocusOnWindow(window);
     return EditorWindow.focusedWindow;
 }

 public static void FocusOnWindow(string window)
 {
     EditorApplication.ExecuteMenuItem("Window/" + window);
 }

You might ask, why focus on the hierarchy window, and then select the go? Well, giving focus to the hierarchy window is the only way I found to get a reference to it, If there was an easier way, I would go for it.

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EMOTION-THEORY · Mar 06, 2014 at 09:56 AM 0

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Ok... YOU are INCREDIBLE :)

Thank you so much for so quickly sharing your findings!

I gave the collapse parameter a default of true just to make the call that much easier :)

 public static void Collapse(GameObject go, bool collapse = true)
 {
     // ...
 }

Cheers!!!!

vexe · Mar 06, 2014 at 12:04 PM 0

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@acheron studio: you might be interested in this answer too - for the sake of completeness.

Jlpeebles · Dec 19, 2014 at 02:13 AM 9

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Also, this allows for expanding/collapsing (recursively) while preserving the active selection.

 public static void SetExpandedRecursive(GameObject go, bool expand)
 {
     var type = typeof(EditorWindow).Assembly.GetType("UnityEditor.SceneHierarchyWindow");
     var methodInfo = type.GetMethod("SetExpandedRecursive");
 
     EditorApplication.ExecuteMenuItem("Window/Hierarchy");
     var window = EditorWindow.focusedWindow;
 
     methodInfo.Invoke(window, new object[] { go.GetInstanceID(), expand });
 }

arielsan Jlpeebles · Feb 14, 2016 at 06:14 PM 0

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Great use of internal hidden code with reflection!, it would be great if Unity guys add this kind of stuff in the editor (not the hidden code but the feature I mean). Do you know a way to do something similar but with the Inspector window? Some times I want to collapse all components in order to edit only one and it kinda sucks to have to collapse them one by one.

usernameHed Jlpeebles · Mar 12, 2019 at 07:49 PM 0

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For the new version, change this in the answer of Jlpeebles: EditorApplication.ExecuteMenuItem("Window/General/Hierarchy");

usernameHed Jlpeebles · Apr 08, 2019 at 12:12 PM 0

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How do you Collapse only the parent with your code @jlpeebles ?

flyingbanana · Jun 18, 2015 at 05:47 AM 2

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^ This should be an answer of its own! Beautiful hack!

Answer 2

Answer by bjarkeck · Jan 06, 2018 at 10:58 AM

You can also find a child of the object you want to expand, and ping it using

 EditorGUIUtility.PingObject(go)

This will expand everything for you.

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Answer 3

You now have to use EditorCoroutines.

Here is the result of what you can do with this: https://twitter.com/i/status/1230264906085105664

Firstly, install:

Window > Package Manager Download
Editor, Coroutines Package

Here is what worked for me. You call it like this:

 EditorWindowControl.EditorCoroutineUtility.StartCoroutineOwnerless(CollapseObjectInHierarchy(myObjectNameInScene, false);

Then here are the two scripts needed:

 using UnityEditor;
 using UntiyEngine;
 using Unity.EditorCoroutines.Editor;

 public class EditorWindowControl {

     private static IEnumerator CollapseObjectInHierarchyWindow(string gameObjectName, bool collapse)
     {
         GameObject obj = GameObject.Find(gameObjectName);

         if (obj != null)
         {
             yield return EditorCoroutineUtility.StartCoroutineOwnerless(CollapseInHierarchyWindow(obj, collapse));
         }
         else
         {
             EditorUtility.DisplayDialog("Error", "No '" + gameObjectName + "' GameObject in Scene!", "OK");
         }

         yield return true;
     }


     private static IEnumerator CollapseInHierarchyWindow(GameObject go, bool collapse)
     {

         FocusUnityEditorWindow(SelectWindowType.Hierarchy);

         yield return new EditorWaitForSeconds(0.05f);

         Selection.activeGameObject = null;

         while (Selection.activeGameObject != null)
             yield return false;

         Selection.activeGameObject = go;

         while (Selection.activeGameObject != go)
             yield return false;

         if (collapse == false)
         {
             SimulatePCControl.RightArrow();
         }
         else
         {
             SimulatePCControl.LeftArrow();
         }

         yield return true;
     }
     
     
     private enum SelectWindowType { Inspector, ProjectBrowser, Game, Console, Hierarchy, Scene };

     private static IEnumerator FocusUnityEditorWindow(SelectWindowType swt)
     {
         System.Type unityEditorWindowType = null;
         EditorWindow editorWindow = null;

         switch (swt)
         {
             case SelectWindowType.Inspector:
                 unityEditorWindowType = typeof(UnityEditor.Editor).Assembly.GetType("UnityEditor.InspectorWindow");
                 break;
             case SelectWindowType.ProjectBrowser:
                 unityEditorWindowType = typeof(UnityEditor.Editor).Assembly.GetType("UnityEditor.ProjectBrowser");
                 break;
             case SelectWindowType.Game:
                 unityEditorWindowType = typeof(UnityEditor.Editor).Assembly.GetType("UnityEditor.GameView");
                 break;
             case SelectWindowType.Console:
                 unityEditorWindowType = typeof(UnityEditor.Editor).Assembly.GetType("UnityEditor.ConsoleView");
                 break;
             case SelectWindowType.Hierarchy:
                 unityEditorWindowType = typeof(UnityEditor.Editor).Assembly.GetType("UnityEditor.SceneHierarchyWindow");
                 break;
             case SelectWindowType.Scene:
                 unityEditorWindowType = typeof(UnityEditor.Editor).Assembly.GetType("UnityEditor.SceneView");
                 break;
         }

         editorWindow = EditorWindow.GetWindow(unityEditorWindowType);

         while (editorWindow == null)
         {
             yield return false;
         } 

         yield return true;

     }
     
 }

Also make a file for this class:

 public class SimulatePCControl
 {

     [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
     public static extern void mouse_event(uint dwFlags, uint dx, uint dy, uint cButtons, uint dwExtraInfo);
     //Mouse actions

     [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
     public static extern void keybd_event(uint bVk, uint bScan, uint dwFlags, uint dwExtraInfo);

     [DllImport("user32.dll")]
     [return: MarshalAs(UnmanagedType.Bool)]
     internal static extern bool GetCursorPos(ref Win32Point pt);

     [StructLayout(LayoutKind.Sequential)]
     internal struct Win32Point
     {
         public Int32 X;
         public Int32 Y;
     };
     public static Vector2 GetMousePosition()
     {
         Win32Point w32Mouse = new Win32Point();
         GetCursorPos(ref w32Mouse);
         return new Vector2(w32Mouse.X, w32Mouse.Y);
     }

     private const int MOUSEEVENTF_LEFTDOWN = 0x02;
     private const int MOUSEEVENTF_LEFTUP = 0x04;
     private const int MOUSEEVENTF_RIGHTDOWN = 0x08;
     private const int MOUSEEVENTF_RIGHTUP = 0x10;
     private const int MOUSEEVENTF_MIDDLEDOWN = 0x20;
     private const int MOUSEEVENTF_MIDDLEUP = 0x40;

     [DllImport("user32.dll")]
     static extern bool PostMessage(IntPtr hWnd, UInt32 Msg, int wParam, int lParam);

     [DllImport("user32.dll")]
     public static extern IntPtr FindWindow(string lpClassName, string lpWindowName);


     public enum ClickType { Left, Middle, Right }

     public static void Click(ClickType clickType, int _X, int _Y)
     {
         //Call the imported function with the cursor's current position
         uint X = (uint)_X;
         uint Y = (uint)_Y;

         switch (clickType)
         {
             case ClickType.Left:
                 mouse_event(MOUSEEVENTF_LEFTDOWN | MOUSEEVENTF_LEFTUP, X, Y, 0, 0);
                 break;
             case ClickType.Middle:
                 mouse_event(MOUSEEVENTF_MIDDLEDOWN | MOUSEEVENTF_MIDDLEUP, X, Y, 0, 0);
                 break;
             case ClickType.Right:
                 mouse_event(MOUSEEVENTF_RIGHTDOWN | MOUSEEVENTF_RIGHTUP, X, Y, 0, 0);
                 break;
         }
         
     }

     public static IEnumerator DoubleClick(ClickType clickType)
     {
         switch (clickType)
         {
             case ClickType.Left:
                 Click(ClickType.Left, (int)GetMousePosition().x, (int)GetMousePosition().y);
                 yield return new EditorWaitForSeconds(0.1f);
                 Click(ClickType.Left, (int)GetMousePosition().x, (int)GetMousePosition().y);
                 break;
             case ClickType.Middle:
                 Click(ClickType.Middle, (int)GetMousePosition().x, (int)GetMousePosition().y);
                 yield return new EditorWaitForSeconds(0.1f);
                 Click(ClickType.Middle, (int)GetMousePosition().x, (int)GetMousePosition().y);
                 break;
             case ClickType.Right:
                 Click(ClickType.Right, (int)GetMousePosition().x, (int)GetMousePosition().y);
                 yield return new EditorWaitForSeconds(0.1f);
                 Click(ClickType.Right, (int)GetMousePosition().x, (int)GetMousePosition().y);
                 break;
         }
     }


     private const int VK_LEFT   = 0x25;
     private const int VK_RIGHT  = 0x27;
     private const int VK_UP     = 0x26;
     private const int VK_DOWN   = 0x28;

     public static void Key(string keyName)
     {
         uint keyCode = 0x00;

         switch (keyName.ToLower())
         {
             case "a":
                 keyCode = 0x41;
                 break;
             case "b":
                 keyCode = 0x42;
                 break;
             case "c":
                 keyCode = 0x43;
                 break;
             case "d":
                 keyCode = 0x44;
                 break;
             case "e":
                 keyCode = 0x45;
                 break;
             case "f":
                 keyCode = 0x46;
                 break;
             case "g":
                 keyCode = 0x47;
                 break;
             case "h":
                 keyCode = 0x48;
                 break;
             case "i":
                 keyCode = 0x49;
                 break;
             case "j":
                 keyCode = 0x4A;
                 break;
             case "k":
                 keyCode = 0x4B;
                 break;
             case "l":
                 keyCode = 0x4C;
                 break;
             case "m":
                 keyCode = 0x4D;
                 break;
             case "n":
                 keyCode = 0x4E;
                 break;
             case "o":
                 keyCode = 0x4F;
                 break;
             case "p":
                 keyCode = 0x50;
                 break;
             case "q":
                 keyCode = 0x51;
                 break;
             case "r":
                 keyCode = 0x52;
                 break;
             case "s":
                 keyCode = 0x53;
                 break;
             case "t":
                 keyCode = 0x54;
                 break;
             case "u":
                 keyCode = 0x55;
                 break;
             case "v":
                 keyCode = 0x56;
                 break;
             case "w":
                 keyCode = 0x57;
                 break;
             case "x":
                 keyCode = 0x58;
                 break;
             case "y":
                 keyCode = 0x59;
                 break;
             case "z":
                 keyCode = 0x5A;
                 break;
             default:
                 Debug.Log("INVALID KEYNAME: " + keyName);
                 return;
         }
         
         keybd_event(keyCode, 0, 0, 0);
         keybd_event(keyCode, 0, 0x0002, 0);

     }


     public const int VK_CONTROL = 0x11; //Control key code
     public const int KEYEVENTF_KEYUP = 0x0002; //Key up flag
     public const int VK_CONTROLKEY = 0x11; //Control key code
     public const int Z = 0x5A;

     public static void Shortcuts_Undo()
     {
         keybd_event(VK_CONTROL, 0, KEYEVENTF_KEYUP, 0);
         keybd_event(Z, 0, KEYEVENTF_KEYUP, 0);

         keybd_event(VK_CONTROL, 0x9e, 0, 0);
         keybd_event(Z, 0x9e, 0, 0);
         keybd_event(Z, 0x9e, KEYEVENTF_KEYUP, 0);
         keybd_event(VK_CONTROL, 0x9e, KEYEVENTF_KEYUP, 0);
     }

     public static void LeftArrow()
     {
         keybd_event(VK_LEFT, 0, 0, 0);
         keybd_event(VK_LEFT, 0, 0x0002, 0);
     }

     public static void RightArrow()
     {
         keybd_event(VK_RIGHT, 0, 0, 0);
         keybd_event(VK_RIGHT, 0, 0x0002, 0);
     }

     public static void UpArrow()
     {
         keybd_event(VK_UP, 0, 0, 0);
         keybd_event(VK_UP, 0, 0x0002, 0);
     }

     public static void DownArrow()
     {
         keybd_event(VK_DOWN, 0, 0, 0);
         keybd_event(VK_DOWN, 0, 0x0002, 0);
     }


 }

Fold/unfold gameobject from code

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