要根据 UXML 模板构建用户界面,必须先将模板加载到 VisualTreeAsset
中:
var template = EditorGUIUtility.Load("path/to/file.uxml") as VisualTreeAsset;
或者采用更直接的方式:
var template = AssetDatabase.LoadAssetAtPath<VisualTreeAsset>("path/to/file.uxml");
然后可以构建表示的视觉树并将其附加到父元素:
template.CloneTree(parentElement, slots);
在上面的语句中,模板中的 <UXML>
元素被转换为 VisualElement
。相反,其所有子项都附加到 parentElement
指定的元素。
实例化模板后,即可使用 UQuery(Unity 的 JQuery/Linq 实现)从视觉元素树中检索特定元素。
例如,以下代码演示了如何创建新的 EditorWindow
并加载 UXML 文件作为其内容:
public class MyWindow : EditorWindow {
[MenuItem ("Window/My Window")]
public static void ShowWindow () {
EditorWindow w = EditorWindow.GetWindow(typeof(MyWindow));
VisualTreeAsset uiAsset = AssetDatabase.LoadAssetAtPath<VisualTreeAsset>("Assets/MyWindow.uxml");
VisualElement ui = uiAsset.CloneTree(null);
w.rootVisualElement.Add(ui);
}
void OnGUI () {
// 此处无需执行任何操作,除非还需要处理 IMGUI 相关事项。
}
}
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