Question

我有一个主屏幕和一个弹出窗口。主屏幕上的button从输入中接收其文本。弹出窗口显示一个按钮，该按钮从主屏幕上的按钮接收文本，当按下弹出按钮时，该按钮上的文本将返回主屏幕上的按钮。基本上，我希望文本在按下时在这些按钮之间来回反弹。只要主屏幕是根窗口小部件，这对我就有效。添加屏幕管理器时，functions不会更改文本，但是print语句仍会运行。

我已经尝试通过应用class引用主屏幕并运行该方法，这将运行打印语句，但不会更改按钮文本。我能够更改按钮文本的唯一方法是，将主屏幕设为根窗口小部件，然后调用on_press:root.my_func()
我需要多个屏幕，所以我认为这不是解决方案。

from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.app import App 
from kivy.uix.widget import Widget
from kivy.properties import ObjectProperty
from kivy.uix.button import Button
from kivy.uix.label import Label
from kivy.lang import Builder
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.popup import Popup


pop_list = []

class MainWindow(Screen):

    my_input = ObjectProperty(None)
    btn_text = ObjectProperty(None)

    def write_button(self):

        self.btn_text.text = self.my_input.text
        self.my_input.text = ''

    def write_main(self,_text):

        self.btn_text.text = _text

    def show_popup(self):
            popup = MyPopup()
        popupWindow = Popup(size_hint=None,None) 
                  ,content=popup,size=(600,600))
        popupWindow.open()
        popup.write_pop()


    def write_pop(self):
        pop_list.append(self.btn_text.text)
        self.btn_text.text = ''



class MyPopup(FloatLayout):

    pop_btn = ObjectProperty(None)

    def write_pop(self):
        try:
            self.pop_btn.text = pop_list[0]
        except:
            pass

class SecondWindow(Screen):
    pass

class ScreenManager(ScreenManager):
    pass


kv = Builder.load_file('popup_test.kv')

class PopUpTestApp(App):
    mw = MainWindow()
    def build(self):
        return kv





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

还有kv文件

<Button>:
font_size: 10
color:0.3,0.4,0.5,1
size_hint: 0.5,0.1

<Label>:
    font_size: 30
    color:0,0,0,1
    size_hint: 0.5,0.1
    canvas.before:
        Color:
            rgb: 1,1,1,1
        Rectangle:
            pos: self.pos
            size:self.size

ScreenManager:
    MainWindow:
    SecondWindow:   

<MainWindow>:
    name: 'main'

    my_input:my_input
    btn_text:btn_text

    Label:
        text: 'Input'
        pos_hint: {'x':0, 'top':1}


    TextInput:
        id: my_input
        size_hint: 0.5,0.1
        pos_hint: {'x':0, 'top':0.9}
        multiline:False
        font_size:30

    Label:
        text: 'write to popup button'
        pos_hint: {'right':1, 'y':0.9}


    Button:

        text:'write to mainscreen button'
        pos_hint: {'x':0.,'top':0.8}
        on_press: root.write_button()


    Button:
        id: btn_text
        pos_hint: {'right':1.,'y':0.8}
        on_press: root.write_pop()

    Button:
        text:'show popup'
        pos_hint: {'right':1,'y':0.4}
        on_press: root.show_popup()

<MyPopup>:

    id:pop

    pop_btn:pop_btn

    Label:
        text:'press to write to mainscreen button'
        size_hint: 1,0.1
        pos_hint: {'x': 0, 'top':1}

    Button:
        id:pop_btn
        pos_hint: {'x': 0, 'top':0.9}
        size_hint: 1,0.1
        on_press:app.mw.write_main(self.text)
        on_release:self.text = ''

使用弹出按钮Kivy更改主屏幕（screenmanager）的文本

0 个答案: