如何将Kivy TreeView节点展开事件绑定到函数

Question

我在线查看，我仍然坚持如何将TreeView的'on_node_expand'绑定到一个函数。

是否可以获得正确的语法？

def createSubNode(elemObj,designTree,parent=None):
    if type(elemObj) is (designClass.PathGroup):
        pass
    else:
        for (name, obj) in elemObj.items():
            subroot = designTree.add_node(TreeViewLabel(text=name,font_size=12),parent)
            subroot.fbind('on_node_expand', bind_object)
            createSubNode(obj,designTree,subroot)

def bind_object(node):
    print("testing")

if __name__ == '__main__':
    from kivy.app import App

    class TestApp(App):
        def build(self):
            designTree = TreeView(root_options=dict(text='Designs',font_size=12))
            designTree.size_hint = (1,None)
            designTree.bind(minimum_height=designTree.setter('height'))
            createSubNode(dsgnManObj, designTree)
            svRoot = ScrollView(size=(Window.width, Window.height))
            svRoot.add_widget(designTree)
            root = BoxLayout(orientation ='horizontal')
            root.add_widget(svRoot)
            return root

    TestApp().run()

Answer 1

on_node_expand是TreeView上的事件，而不是节点上的事件，因此您不需要将其绑定到subroot个对象上，而只需绑定在designTree对象上。