如何动态更新 Omniverse 扩展的下拉菜单文本？

Question

我正在使用内置

omni

库为 Omniverse Create 创建自定义扩展。我有一个简单的窗口，它创建一个下拉菜单 (

CollapsableFrame

)，其中有一个

TreeView

：

self._window = ui.Window("My Window", width = 300, height = 200)
self._items_count = 0

with self._window.frame:
    with ui.VStack():
        with ui.CollapsableFrame(f'My List {self._items_count} items:', collapsed = True):
            tree_view = ui.TreeView(
                self._model_all_usd,
                root_visible = False,
                header_visible = False,
                columns_resizable = True,
                column_widths = [ui.Fraction(0.4), ui.Fraction(0.3)],
                style = {"TreeView.Item": {"margin": 4}})

我还有一个用于监听选择更改的功能：

def _on_stage_event(self, event):
    if event.type == int(omni.usd.StageEventType.SELECTION_CHANGED):
        // do stuff
        self._items_count += 1    # increase count whenever the selection changes

我当前拥有的将更新

self._items_count

值，但下拉文本不会更新。我怎样才能实现这个目标？

Answer 1

只需参考

CollapsableFrame

：

with self._window.frame:
    with ui.VStack():
        self._dropdown_frame = ui.CollapsableFrame(f'My List {self._items_count} items:', collapsed = True)
        with self._dropdown_frame:
            tree_view = ui.TreeView(
                self._model_all_usd,
                root_visible = False,
                header_visible = False,
                columns_resizable = True,
                column_widths = [ui.Fraction(0.4), ui.Fraction(0.3)],
                style = {"TreeView.Item": {"margin": 4}})

然后通过修改

title

属性进行更新：

def _on_stage_event(self, event):
    if event.type == int(omni.usd.StageEventType.SELECTION_CHANGED):
        // do stuff
        self._items_count += 1    # Increase count whenever the selection changes
        self._dropdown_frame.title = f'My List {self._items_count} items:'