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[Danielbanana21]

from kivy.lang import Builder
from kivymd.app import MDApp
from kivymd.uix.dialog import MDDialog
from kivymd.uix.button import MDFlatButton

KV = '''
BoxLayout:
orientation: 'vertical'

MDLabel:
    text: 'Quer namorar comigo?'
    halign: 'center'
    font_style: 'H4'
    size_hint_y: None
    height: self.texture_size[1]

MDRaisedButton:
    text: 'Sim'
    size_hint: None, None
    width: 150
    pos_hint: {'center_x': 0.5}
    on_release: app.dialog.open()

'''

class MyApp(MDApp):
def build(self):
self.dialog = MDDialog(
title="Pedido de Namoro",
text="Você aceita namorar comigo?",
buttons=[
MDFlatButton(
text="Sim", on_release=self.accept
),
MDFlatButton(
text="Não", on_release=self.dismiss
),
],
)
return Builder.load_string(KV)

def accept(self, *args):
    self.dialog.dismiss()
    self.root.clear_widgets()
    self.root.add_widget(
        Builder.load_string(
            '''
            MDLabel:
                text: 'Parabéns, agora somos namorados!'
                halign: 'center'
                font_style: 'H4'
                size_hint_y: None
                height: self.texture_size[1]
            '''
        )
    )

def dismiss(self, *args):
    self.dialog.dismiss()
    self.root.clear_widgets()
    self.root.add_widget(
        Builder.load_string(
            '''
            MDLabel:
                text: 'Tudo bem, talvez da próxima vez.'
                halign: 'center'
                font_style: 'H4'
                size_hint_y: None
                height: self.texture_size[1]
            '''
        )
    )

if name == 'main':
MyApp().run()