如何解决编写MDDropdownMenu项
我尝试在 MDdropdownMenu 中写入所选项目。 但是,即使使用此代码,我也找不到它 我对 menu.bind(.....) 函数没有任何结果
from kivymd.app import MDApp
from kivymd.uix.menu import MDDropdownMenu
from kivy.lang import Builder
from kivy.clock import Clock
from kivymd.uix.screen import Screen
KV = """
<BuildApp>:
MDRaisedButton:
id: button
text: "PRESS ME"
pos_hint: {"center_x": .5,"center_y": .5}
on_release: root.menu.open()
BuildApp:
"""
class BuildApp(Screen):
def __init__(self,**kwargs):
super().__init__(**kwargs)
Clock.schedule_once(self._late_init)
def _late_init(self,interval):
menu_items = [{"text": f"Item {i}"} for i in range(5)]
self.menu = MDDropdownMenu(
caller=self.ids.button,items=menu_items,width_mult=4,)
self.menu.bind(on_release=self.menu_callback)
def menu_callback(self,instance_menu,instance_menu_item):
print(instance_menu,instance_menu_item)
class MainApp(MDApp):
def build(self):
self.root = Builder.load_string(KV)
MainApp().run()
另外,如何在.Kv文件中编写MDDropdownMenu部分
最好的问候
解决方法
使用 callback
的 MDDropdownMenu
属性:
def _late_init(self,interval):
menu_items = [{"text": f"Item {i}"} for i in range(5)]
self.menu = MDDropdownMenu(
caller=self.ids.button,items=menu_items,callback=self.menu_callback,width_mult=4,)
def menu_callback(self,instance_menu_item):
print(instance_menu_item.text)
您可以在 kv
中定义下拉菜单,如下所示:
from kivymd.app import MDApp
from kivymd.uix.menu import MDDropdownMenu
from kivy.lang import Builder
from kivy.clock import Clock
from kivymd.uix.screen import Screen
KV = """
<MyMenu>:
items: [{'text':'item 0'},{'text':'item 1'},{'text':'item 2'},{'text':'item 3'},{'text':'item 4'}]
caller: app.root.ids.button
callback: app.root.menu_callback
width_mult: 4
<BuildApp>:
MDRaisedButton:
id: button
text: "PRESS ME"
pos_hint: {"center_x": .5,"center_y": .5}
on_release: root.menu.open()
BuildApp:
"""
class MyMenu(MDDropdownMenu):
pass
class BuildApp(Screen):
def menu_callback(self,instance_menu_item):
print(instance_menu_item.text)
class MainApp(MDApp):
def build(self):
root = Builder.load_string(KV)
Clock.schedule_once(self.build_menu)
return root
def build_menu(self,dt):
# cannot create menu until after app is built because of references to app.root in kv
self.root.menu = MyMenu()
MainApp().run()
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