[英]Kivy widget in python to kv file, how control it
我有一个简单的测试程序:
main.py
from kivy.app import App
from kivy.uix.button import Button
from kivy.uix.screenmanager import Screen
from kivy.clock import mainthread
class TestScreen(Screen):
@mainthread
def on_pre_enter(self): #Is loaded before kv buttons etc? how make it work
pass
@mainthread
def on_enter(self): #Load after kv buttons etc?
button = Button(text="Work?")
#how now add it to display?
#how control where display it? on end or begin is just about on_pre and on?
class TestApp(App):
pass
if __name__ == '__main__':
TestApp().run()
和test.kv文件
#:import NoTransition kivy.uix.screenmanager.NoTransition
<TestScreen>:
name:'try'
GridLayout:
id:'test'
cols:2
Button:
text:'Test'
on_press:app.root.current='Main'
ScreenManager:
transition: NoTransition()
Screen:
name: 'Main'
GridLayout:
cols:1
Button:
text:'1'
Button:
text:'2'
Button:
text:'Test'
on_press:root.current='try'
TestScreen:
是很容易控制kv和python小部件的(但是我不知道如何,但是更容易在kv文件中编写小部件等,但是仍然需要在python中创建一些自动内容)还是更好地仅在python中创建所有kv文件? 我想做这样的事情:总是显示带有左菜单的应用程序,而在右边的另一个基于屏幕的动态内容的屏幕(从菜单中单击)可能是另一个简单的解决方案。 有人可以逐步解释我吗? :)
解决AttributeError的方法,请在test.kv文件中将“ id:'test'”替换为“ id:test”。
根据菜单的点击,可以显示具有动态内容的屏幕。 但是切记要删除退出屏幕(TestScreen / SettingsScreen)时添加的小部件。 如果不删除窗口小部件,则每次进入屏幕(TestScreen / SettingsScreen)时,都会获得每个窗口小部件的重复项/倍数。 我建议使用on_pre_enter和on_leave方法。 有关详细信息,请参见以下示例。
from kivy.app import App
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.button import Button
class MyScreenManager(ScreenManager):
pass
class MenuScreen(Screen):
pass
class SettingsScreen(Screen):
def on_pre_enter(self, *args):
self.ids.test.add_widget(Button(text="Work?"))
def on_leave(self, *args):
self.ids.test.remove_widget(self.ids.test.children[0])
class TestApp(App):
title = "Add & Remove Widgets Dynamically"
def build(self):
return MyScreenManager()
if __name__ == "__main__":
TestApp().run()
#:kivy 1.10.0
#:import NoTransition kivy.uix.screenmanager.NoTransition
<MyScreenManager>:
transition: NoTransition()
MenuScreen:
SettingsScreen:
<MenuScreen>:
name: 'menu'
GridLayout:
cols: 1
Button:
text: '1'
Button:
text: '2'
Button:
text: 'Test'
on_press: root.manager.current = 'settings'
<SettingsScreen>:
name:'settings'
GridLayout:
id: test
cols: 2
Button:
text: 'Test'
on_press: root.manager.current = 'menu'
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