Kivy 编程，如何通过按下另一个按钮来更改按钮的颜色或图像

Question

所以我和我的朋友们一直在尝试在 kivy 上编写游戏，但我们被困在这一点上，我们无法弄清楚如何通过按下另一个按钮来更改按钮的颜色或图像。 游戏在棋盘中，我们正在尝试做 Fox & Hound 游戏，所以想法是当用户按下猎犬时，棋盘上的 2 个方块会亮起，指示您可以移动的位置，然后按下其中一个他们，将 de Hound 的图像更改为被按下的图像。

这是代码，希望你能帮助我，谢谢。

from kivy.app import App
from kivy.graphics import *
from kivy.uix.button import Button
from kivy.uix.gridlayout import GridLayout
from kivy.core.window import Window
from kivy.uix.popup import Popup
from kivy.app import App
from kivy.uix.gridlayout import GridLayout
from kivy.uix.label import Label
from kivy.uix.textinput import TextInput
from kivy.uix.button import Button
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.stacklayout import StackLayout
from kivy.clock import Clock
from kivy.lang import Builder
from kivy.config import Config

Window.size = (800, 800)

intento = 0
nroboton= [0,0]

class MainWindow(GridLayout): # main class
    def popbtns(self):
        i = 3
        self.add_widget(Label(text=' '))
        self.add_widget(Btn(id=str(i+3), size=(100, 100), background_color=(0,0,0,1)))
        i = i - 1

class Btn(Button): # button class
    def on_release(self):
        print('self.pos= ' + str(self.id))
    def on_press(self):
        global intento
        if(intento == 1):
            nroboton[1] = self.id
            print('moviendose de ' + str(nroboton[0]) + 'a ' + str(nroboton[1]))
            intento = 0
        else:
            nroboton[0] = self.id
            intento = 1
        print('llamada ssh ' + str(self.id))

class But(Button):
    def new(self):
        self.background_color=(0,250,0,1)

class Zorro(Button): # button class
    def on_release(self):
        print('self.pos= ' + str(self.id))
    def on_press(self):
        global intento
        if(intento == 1):
            nroboton[1] = self.id
            print('moviendose de ' + str(nroboton[0]) + 'a ' + str(nroboton[1]))
            intento = 0
        else:
            nroboton[0] = self.id
            intento = 1
        print('llamada ssh ' + str(self.id)) 

class MainApp(App):

    def build(self):

        main = MainWindow(cols=3, rows=1)
        self.root = main  # don't use global!
        # make background
        with main.canvas:
            Rectangle(pos=main.pos, size=(10000,10000))

        # populate gridlayout with Buttons
        #main.add_widget(Debug(text='debug', background_color=(1, 0, 0, 1)))
        main.popbtns()
        # print position of buttons...
        Clock.schedule_once(self.delayed_function, 0.1)

    def delayed_function(self, dt):
        self.print_buttons_pos()

    def print_buttons_pos(self):
        for child in self.root.children:
            print(str(child) + ' pos is ' + str(child.id))

if __name__ == "__main__":
    MainApp().run()

这是猎犬和狐狸的图像。 Hound Fox

好的，这就是我可以减少的所有内容，希望对您有所帮助

Answer 1

这里有一些代码向您展示如何通过按下另一个按钮来更改一个按钮的颜色。

我使用父窗口的ids 属性，这当然是更好的方法之一。我在这里留下了一堆你的代码，但你会注意到我最终删除了很多，因为那不是 MCVE 的一部分。

from kivy.app import App
from kivy.graphics import *
from kivy.core.window import Window
from kivy.uix.gridlayout import GridLayout
from kivy.uix.button import Button
from kivy.lang import Builder

Window.size = (800, 800)

intento = 0
nroboton= [0,0]

setup = '''
MyGame:
    cols: 3
    rows: 2
    # This could have just been "Button"
    # and it would work just fine, too.
    Btn:
        # This ID is only valid inside the .kv
        # stuff, so we have to pass something
        # else to the pressed/released handlers
        id: hello_btn
        text: 'Hello'
        size: 100,100
        # These lines are how to identify the
        # button doing the pressing
        on_press: root.was_pressed('hello')
        on_release: root.was_released('hello')
    Btn:
        id: world_btn
        text: 'World'
        size: 100,100
        on_press: root.was_pressed('world')
        on_release: root.was_released('world')
'''

# I'm not using any of this code, you may want it
# if you're trying to do something special with the
# buttons you're creating. Otherwise just change
# Btn to Button
class Btn(Button): # button class
    def on_release(self):
        print('self.pos= ' + str(self.id))
    def on_press(self):
        global intento
        self.background_color = [1,1,1,1]

        print('IDs: ', self.parent.ids)
        if(intento == 1):
            nroboton[1] = self.id
            print('moviendose de ' + str(nroboton[0]) + 'a ' + str(nroboton[1])
            intento = 0
        else:
            nroboton[0] = self.id
            intento = 1
        print('llamada ssh ' + str(self.id))


class MyGame(GridLayout):
    def was_pressed(self, name):
        if name == 'hello':
            btn = self.ids['world_btn']
        elif name == 'world':
            btn = self.ids['hello_btn']
        btn.background_color = [255, 0, 0, 1]

    def was_released(self, name):
        if name == 'hello':
            btn = self.ids['world_btn']
        elif name == 'world':
            btn = self.ids['hello_btn']
        btn.background_color = [1, 1, 1, 1]


class MainApp(App):
    def build(self):
        return Builder.load_string(setup)

if __name__ == "__main__":
    MainApp().run()