QAttribute.md

QAttribute Example

Old alternative to code generation for query assignment.
Using code-gen is recommended.

Standard VisualElement assigment

public class ExampleEditorWindow 
{
    ObjectField objField;
    ListView listView;
    Label label;
    
    void OnEnable()
    {
      objField = rootVisualElement.Q<ObjectField>("objField");
      listView = rootVisualElement.Q<ListView>("listView");
      label = rootVisualElement.Q<Label>("label");
    }
}

QAttribute

public class ExampleEditorWindow 
{
    [Q("objField")] ObjectField objField;
    [Q("listView")] ListView listView;
    [Q("label")] Label label;
    
    void OnEnable()
    {
      rootVisualElement.AssignQueryResults(this);
    }
}

QAttribute marks the class member as a query target, and the AssignQueryResults extension method assigns appropriate UQuery results to those members.

Copy Field Declarations (UI builder)

Select visual element in your UI Builder hierarchy and use UI Builder/Copy Field Declarations shortcut (Alt + C). This will copy C# field declarations for the selected visual element and its children.

Copied C# field declarations:

    [Q("root")]
    private VisualElement root;
    [Q("child")]
    private VisualElement child;