Kivy - 另一个屏幕上的滑块类值更改 [英] Kivy - Slider Class value change on another screen
问题描述
我有一个滑块,它的值会改变标签.这很容易理解.现在的问题是我想用这个值在另一个屏幕上显示.最终,我希望滑块在另一个屏幕上显示 1-16 个图像,具体取决于滑块上选择的值.以下是我现在所拥有的,它适用于该屏幕,但我如何让这个值显示在另一个屏幕上?我知道我必须创建一个类,它已经进行了多次尝试,每一次似乎都让我感到困惑,而不是更好地理解它.
I have a slider which value changes the label. That was easy to understand. Now the problem is I want to use this value to show on another screen. Eventually I want the slider to show 1-16 images on another screen dependent on what value is selected on the slider. Below is what I have as of now, which works well for that screen, but how do I get this value to show on another screen? I know I have to create a class, which have made multiple attempts and each seems to confuse me more than understand it better.
<NewGameScreen>:
name: 'newgame'
BoxLayout:
orientation: 'vertical'
height: 100
Label:
text: 'New Game'
font_size: 70
Label:
text: 'Players'
font_size: 30
pos: 300, 400
Slider:
id: s1
pos: 420, 400
width: '250dp'
min: 1
max: 16
step: 1
value: 1
on_value: s1.value = self.value
Label:
text: '{}'.format(s1.value)
font_size: 30
pos: 670, 400
推荐答案
您可以通过底层 ScreenManager
传递值.一个工作示例:
You can pass values through underlying ScreenManager
. A working example:
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.screenmanager import ScreenManager, Screen
kv = '''
<NewGameScreen>:
name: 'newgame'
BoxLayout:
orientation: 'vertical'
Slider:
id: s1
min: 1
max: 16
step: 1
value: 1
on_value:
root.manager.get_screen('options').label.text = str(self.value)
Button:
text: 'Options'
on_press:
root.manager.transition.direction = 'left'
root.manager.current = 'options'
<OptionScreen>:
label: label
name: 'options'
orientation: 'vertical'
BoxLayout:
Button:
text: 'Go back'
on_press:
root.manager.transition.direction = 'right'
root.manager.current = 'newgame'
Label:
id: label
text: '1'
'''
Builder.load_string(kv)
class NewGameScreen(Screen):
pass
class OptionScreen(Screen):
pass
class TestApp(App):
def build(self):
sm = ScreenManager()
sm.add_widget(NewGameScreen())
sm.add_widget(OptionScreen())
return sm
if __name__ == '__main__':
TestApp().run()
更新:
扩展示例(根据滑块值添加按钮):
Update:
An extended exaple (adding buttons based on slider value):
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.button import Button
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.properties import ObjectProperty
kv = '''
#:import Label kivy.uix.label.Label
<NewGameScreen>:
name: 'newgame'
slider: slider
BoxLayout:
orientation: 'vertical'
Slider:
id: slider
min: 1
max: 16
step: 1
value: 1
on_value: root.update_buttons()
Button:
text: 'Options'
on_press:
root.manager.transition.direction = 'left'
root.manager.current = 'options'
<OptionScreen>:
layout: layout
name: 'options'
BoxLayout:
Button:
text: 'Go back'
on_press:
root.manager.transition.direction = 'right'
root.manager.current = 'newgame'
BoxLayout:
orientation: 'vertical'
id:layout
Button:
text: "1"
'''
Builder.load_string(kv)
class NewGameScreen(Screen):
slider = ObjectProperty(None)
def update_buttons(self, *args):
layout = self.manager.get_screen('options').layout
layout.clear_widgets()
for i in range(int(self.slider.value)):
layout.add_widget(Button(text=str(i+1)))
class OptionScreen(Screen):
layout = ObjectProperty(None)
class TestApp(App):
def build(self):
sm = ScreenManager()
sm.add_widget(NewGameScreen())
sm.add_widget(OptionScreen())
return sm
if __name__ == '__main__':
TestApp().run()
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