Bind without the binding path

Version: 2021.3+

You can call BindProperty() to bind an element to a SerializedProperty object directly, instead of with the binding path. This example demonstrates how to bind with BindProperty().

Example overview

This example creates a custom Editor window to change the name of a GameObject.

You can find the completed files that this example creates in this GitHub repository.

先决条件

This guide is for developers familiar with the Unity Editor, UI Toolkit, and C# scripting. Before you start, get familiar with the following:

• BindProperty

Bind with BindProperty()

Create a custom Editor window in C# with a TextField. Find the name property of a GameObject and bind to the property directly with the BindProperty() method.

1. In your Project window, create a folder named bind-without-binding-path to store your file.

2. In the bind-without-binding-path folder, create a folder named Editor.

3. In the Editor folder, create a C# script named SimpleBindingPropertyExample.cs and replace its contents with the following:

   using UnityEditor;
   using UnityEngine;
   using UnityEditor.UIElements;
   using UnityEngine.UIElements;
   
   namespace UIToolkitExamples
   {
       public class SimpleBindingPropertyExample : EditorWindow
       {
           TextField m_ObjectNameBinding;
   
           [MenuItem("Window/UIToolkitExamples/Simple Binding Property Example")]
           public static void ShowDefaultWindow()
           {
               var wnd = GetWindow<SimpleBindingPropertyExample>();
               wnd.titleContent = new GUIContent("Simple Binding Property");
           }
               
           public void CreateGUI()
           {
               m_ObjectNameBinding = new TextField("Object Name Binding");
               rootVisualElement.Add(m_ObjectNameBinding);
               OnSelectionChange();
           }
   
           public void OnSelectionChange()
           {
               GameObject selectedObject = Selection.activeObject as GameObject;
               if (selectedObject != null)
               {
                   // Create the SerializedObject from the current selection
                   SerializedObject so = new SerializedObject(selectedObject);
   
                   // Note: the "name" property of a GameObject is actually named "m_Name" in serialization.
                   SerializedProperty property = so.FindProperty("m_Name");
                   // Bind the property to the field directly
                   m_ObjectNameBinding.BindProperty(property);
               }
               else
               {
                   // Unbind any binding from the field
                   m_ObjectNameBinding.Unbind();
               }
           }
       }
   }
   

Test the binding

1. In Unity, select Window > UIToolkitExamples > Simple Binding Property Example. A custom Editor window appears with a text field.
2. Select a GameObject in your scene. The name of the GameObject appears in your Editor window’s text field. If you change the name of the GameObject in the text field, the name of the GameObject changes.

其他资源

• SerializedObject data binding
• Bindable elements
• Binding data type conversion
• Implementation details
• Binding examples