Question

我在我的应用程序的Flashcard屏幕上制作了10个按钮，所有这些按钮都指向flashDisplay屏幕on_press。因此，在FlashDisplay屏幕中，我需要知道哪个按钮已被按下，以便我可以相应地触发事件。我怎样才能做到这一点？是否有按钮的任何属性给出按钮的索引或我们必须使用id。以及如何做到这一点？

这里是kv代码的一部分 -

<FlashCard>:
    ScrollView:
        size: self.size
        GridLayout:
            cols: 5
            rows: 2
            padding:10
            spacing:10

            Button:
                text:'Flash Card 1'
                on_press: root.manager.current='flash_display'
                width:200
                size_hint_x: None
            Button:
                text:'Flash Card 2'
                on_press: root.manager.current='flash_display'
                width:200
                size_hint_x: None
            Button:
                text:'Flash Card 3'
                on_press: root.manager.current='flash_display'
                width:200
                size_hint_x: None
            Button:
                text:'Flash Card 4'
                on_press: root.manager.current='flash_display'
                width:200
                size_hint_x: None
            Button:
                text:'Flash Card 5'
                on_press: root.manager.current='flash_display'
                width:200
                size_hint_x: None
            Button:
                text:'Flash Card 6'
                on_press: root.manager.current='flash_display'
                width:200
                size_hint_x: None
            Button:
                text:'Flash Card 7'
                on_press: root.manager.current='flash_display'
                width:200
                size_hint_x: None
            Button:
                text:'Flash Card 8'
                on_press: root.manager.current='flash_display'
                width:200
                size_hint_x: None
            Button:
                text:'Flash Card 9'
                on_press: root.manager.current='flash_display'
                width:200
                size_hint_x: None
            Button:
                text:'Flash Card 10'
                on_press: root.manager.current='flash_display'
                width:200
                size_hint_x: None

py代码 -

class FlashDisplayPage(Screen):      #name of this screen is flash_display

    # code for indexing the button

    # other codes

Answer 1

该属性不是默认属性，因此必须创建它。而不是使用root.manager.current = 'flash_display'，你应该调用另一个传递索引并更改屏幕的函数。要设置索引，我们可以使用setattr来创建新属性，然后我们可以通过self.index获取该索引。

<强> test.kv

<FlashCard>:
    ScrollView:
        size: self.size
        GridLayout:
            cols: 5
            rows: 2
            padding:10
            spacing:10

            Button:
                text:'Flash Card 1'
                on_press: root.on_press(1)
                width:200
                size_hint_x: None
            Button:
                text:'Flash Card 2'
                on_press: root.on_press(2)
                width:200
                size_hint_x: None
            Button:
                text:'Flash Card 3'
                on_press: root.on_press(3)
                width:200
                size_hint_x: None
            Button:
                text:'Flash Card 4'
                on_press: root.on_press(4)
                width:200
                size_hint_x: None
            Button:
                text:'Flash Card 5'
                on_press: root.on_press(5)
                width:200
                size_hint_x: None
            Button:
                text:'Flash Card 6'
                on_press: root.on_press(6)
                width:200
                size_hint_x: None
            Button:
                text:'Flash Card 7'
                on_press: root.on_press(7)
                width:200
                size_hint_x: None
            Button:
                text:'Flash Card 8'
                on_press: root.on_press(8)
                width:200
                size_hint_x: None
            Button:
                text:'Flash Card 9'
                on_press: root.on_press(9)
                width:200
                size_hint_x: None
            Button:
                text:'Flash Card 10'
                on_press: root.on_press(10)
                width:200
                size_hint_x: None

<强> main.py

from kivy.app import App
from kivy.uix.screenmanager import ScreenManager, Screen

class FLashCard(Screen):
    def on_press(self, index):
        flash_display_screen = self.manager.get_screen('flash_display')
        setattr(flash_display_screen, 'index', index)
        self.manager.current='flash_display'

class FlashDisplayPage(Screen):
    def on_pre_enter(self):
        print("on_pre_enter",self.index)

    def on_enter(self):
        print("on_enter", self.index)


class TestApp(App):
    def build(self):
        sm = ScreenManager()
        sm.add_widget(FLashCard(name="flasg_card"))
        sm.add_widget(FlashDisplayPage(name="flash_display"))
        return sm


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

如何访问在kivy中按下哪个按钮

1 个答案: