Kivy 从调用布局的函数外部更新小部件图像

Question

我有一个函数范围问题。在调用评估函数后，按下“放弃”按钮时，我需要更新“cardTableLayout”。我该怎么做呢？我知道这是一个 kv 布局语言问题。我不确定如何从“buttonClick_callback”中引用“cardTableLayout”。 蟒蛇代码

import sys
from os import path, listdir
from random import choice
sys.path.append('libs')
from good_deal import *
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.floatlayout import FloatLayout
from kivy.core.audio import SoundLoader
from kivy.uix.button import Button
from kivy.uix.image import Image
from kivy.uix.behaviors import ToggleButtonBehavior  
from kivy.clock import mainthread
randomSong = choice(listdir('music'))
backgroundMusic = SoundLoader.load(path.join('music', randomSong))
backgroundMusic.play()
backgroundMusic.loop = True
cardImagesGlobal = []
hand, deck = deal()
class ScreenManagement(ScreenManager): pass
class Card(ToggleButtonBehavior, Image): pass
class GameButton(Button): pass
def buttonClick_callback(self):
    buttonClickSound = SoundLoader.load(path.join('sounds', 'buttonClick.ogg'))
    buttonClickSound.play()
    index = 0 
    for items in cardImagesGlobal:
        if items.state == 'down':
            hand.marked.append(index)
            index += 1
    discard(hand, deck)
    evaluate(hand)
class CardTableScreen(Screen):
    @mainthread
    def on_enter(self):
        global cardImagesGlobal
        cardImages = []
        self.ids['handType'].text = hand.type
        index = 0
        for items in hand.ordered:
            cardImages.append(Card(source = hand.filenames[index]))
            self.ids['handLayout'].add_widget(cardImages[index])
            index += 1
        cardImagesGlobal = cardImages
        discardButton = GameButton(text = 'DISCARD')
        discardButton.bind(on_press = buttonClick_callback)
        self.ids['cardTableLayout'].add_widget(discardButton)
layoutFile = Builder.load_file('main.kv')
class Main(App):
    def build(self):
        self.title = 'Good Deal Poker'
        return layoutFile
if __name__ == "__main__":
    Main().run()

.kv 文件

ScreenManagement:
    CardTableScreen:
<Card>:
    size_hint: (.95, .95)
<GameButton>:
    size_hint: (.20, .10)
<CardTableScreen>:
    name: 'cardTableScreen'
    FloatLayout:
        name: 'cardTableLayout'
        id: cardTableLayout
        canvas.before:
            Color:
                rgba: 0,.25,0,1
            Rectangle:
                pos: self.pos
                size: self.size
        Label:
            name: 'handType'
            id: handType
            font_size: '20sp'
            pos_hint: {'center_x':.5, 'center_y':.95}
        BoxLayout:
            size_hint: (1, .30)
            pos_hint: {'center_x':.5, 'center_y':.75}
            name: 'handLayout'
            id: handLayout
            orientation: 'horizontal'
            canvas.before:
                Color:
                    rgba: 0,.25,0,1
                Rectangle:
                    pos: self.pos
                    size: self.size

Answer 1

该按钮已添加到cardTableLayout。按下时，它会执行一个名为buttonClick_callback 的函数，并将自身作为第一个参数传递。

这允许通过调用self.parent 来引用buttonClick_callback 中的cardTableLayout。

Answer 2

问题出在导入的 good_deal 库中。传入的值没有正确更新。纠正后，画布正在正确更新。