Kivy编程，如何通过按另一个按钮来改变按钮的颜色或图像

Question

所以我和我的朋友一直在试图编写基于kivy的游戏，但我们被困在这一点，我们无法弄清楚如何通过按另一个按钮来更改按钮的颜色或图像。 游戏是在一个棋盘上，我们正在尝试做一个狐狸游戏，所以这个想法是，当用户按下猎犬时，棋盘上的2个方块亮起，指示你可以移动的位置，然后按下一个，把猎狗的形象改变为被压制的形象。

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() 

这里是猎犬和狐狸的形象。 Hound Fox

好了，所以这是所有我可以减少它，希望它有助于

Answer 1

下面是一些代码，告诉您如何通过按其他按钮可改变一个按钮的颜色。

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代码，但是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()