如何在Kivy中重置小部件

I have a very simple application having one button and one label. Label have value 0 initially. On each button press, label increase by 1. When label becomes 3, i show a popup with a "play again" button.

我有一个非常简单的应用程序,有一个按钮和一个标签。标签最初的值为0。按下每个按钮,标签增加1.当标签变为3时,我会弹出一个“再次播放”按钮。

Now, i want to reset label to 0.

现在,我想将标签重置为0。

My Attempt:

#!/usr/bin/kivy
import kivy
kivy.require('1.7.2')

from random import random
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.gridlayout import GridLayout
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.button import Button
from kivy.uix.label import Label
from kivy.uix.popup import Popup
from random import random
from random import choice
from kivy.properties import StringProperty
import time
from kivy.clock import Clock

s=0

def my_callback(dt):
    mypopup = MyPopup()
    return mypopup.show_popup()

def go_to_main(self):
    sm.current = 'menu'
    global s
    s=0

def test(self):
    global s
    s=0
    print s

class MyPopup(Popup): 
    def show_popup(self):
        mytext= str(s)
        content = BoxLayout(orientation="vertical")
        content.add_widget(Label(text="Game Over", font_size=20))
        content.add_widget(Label(text="Score", font_size=20))
        content.add_widget(Label(text=mytext, font_size=20))
        mybutton_cancel = Button(text="Play Again", size_hint_y=None, height=40)
        content.add_widget(mybutton_cancel)
        mypopup = Popup(content = content,              
            title = "oops",     
            auto_dismiss = False,         
            size_hint = (.5, .5))
        mybutton_cancel.bind(on_release=mypopup.dismiss)
        mybutton_cancel.bind(on_release=test) 
        mypopup.open()

Builder.load_string("""
<MenuScreen>:
    GridLayout:
        cols: 1
        Button:
            id: btn_0
            text: "press me to increase score"
            on_press: root.val0()
        Label:
            id: score
            text:root.get_score()
""")

class MenuScreen(Screen):
    def get_score(self):
        return str(s)
    #on_click of button code
    def val0(self):
        global s
        s=s+1
        self.ids['score'].text=str(s)
        if(s==3):
            Clock.schedule_once(my_callback, 0)

sm = ScreenManager()
sm.add_widget(MenuScreen(name='menu'))

class TestApp(App):

    def build(self):
        return sm

if __name__ == '__main__':
    TestApp().run()

It resets to 0 successfully, i printed it on console to check, but still display as 3. On button press, changes to 1. I want to show it as 0 instead of 3.

它成功重置为0,我将其打印在控制台上进行检查,但仍然显示为3.按下按钮,更改为1.我想将其显示为0而不是3。

1 个解决方案

#1

Get a hold onto your MenuScreen object

抓住您的MenuScreen对象

# sm.add_widget(MenuScreen(name='menu')) # Replace this line with these two:
menu_screen = MenuScreen(name='menu')
sm.add_widget(menu_screen)

Then, in the test function, call your menu_screen val0 function

然后,在测试功能中,调用menu_screen val0函数

def test(self):
    global s
    s=-1
    menu_screen.val0()

#1