EditorWindow.saveChangesMessage

Description

The message that displays to the user if they are prompted to save

Set saveChangesMessage in a derived class to prevent users from accidentally losing unsaved work. For saveChangesMessage to work, you must use it with EditorWindow.hasUnsavedChanges and override the EditorWindow.SaveChanges method. This message shows exactly as you have written it. This message presents to users who have unsaved changes, if they attempt to close the window or tab with this EditorWindow. The save changes message might combine with other messages from other windows. This occurs if there are multiple windows that have unsaved changes.

// C# Example
// Script that demonstrates the unsaved changes API

using UnityEngine;
using UnityEditor;

public class UnsavedChangesExampleWindow : EditorWindow
{
    [MenuItem("Example/Editor Window With Unsaved Changes")]
    static void Init()
    {
        UnsavedChangesExampleWindow window = (UnsavedChangesExampleWindow)EditorWindow.GetWindowWithRect(typeof(UnsavedChangesExampleWindow), new Rect(100, 100, 400, 400));

        window.saveChangesMessage = "This window has unsaved changes. Would you like to save?";
        window.Show();
    }

    void OnGUI()
    {
        saveChangesMessage = EditorGUILayout.TextField(saveChangesMessage);

        EditorGUILayout.LabelField(hasUnsavedChanges ? "I have changes!" : "No changes.", EditorStyles.wordWrappedLabel);
        EditorGUILayout.LabelField("Try to close the window.");

        if (GUILayout.Button("Create unsaved changes"))
            hasUnsavedChanges = true;

        if (GUILayout.Button("Save"))
            SaveChanges();
    }

    public override void SaveChanges()
    {
        // Your custom save procedures here

        Debug.Log($"{this} saved successfully!!!");
        base.SaveChanges();
    }
}