屏幕有多个布局，所有布局都是框布局的子布局。当单击其他布局中的按钮时，我试图在最后一个子布局(网格布局)中添加一个按钮。代码不会崩溃，但也没有发生任何事情。我想在单击按钮时将按钮添加到带有 id Drinkslayout 的布局，例如百事可乐、雪碧
Python:
class MainScreen(Screen):
pass
class AnotherScreen(Screen):
pass
class ScreenManagement(ScreenManager):
pass
class Stacks(StackLayout):
pass
present=Builder.load_file('hellokivy2.kv') #Specifying location of kv file
class MainApp(App):
def build(self):
return present
def drinksSelect(self,value): #creating a button by referring the id of the layout in which to create button
print(value)
yolo = AnotherScreen()
yolo2 = yolo.ids.newButtonLayout
button = Button(text="value",size_hint= (0.2,0.4))
yolo2.add_widget(button)
if __name__ == "__main__":
MainApp().run()
KV
#: import FadeTransition kivy.uix.screenmanager.FadeTransition
ScreenManagement:
transition: FadeTransition()
MainScreen:
AnotherScreen:
<MainScreen>:
name: "main"
canvas.before:
Color:
rgba: 1, 1, 1, 1
Rectangle:
pos: self.pos
size: self.size
BoxLayout:
orientation: 'vertical'
size:root.size
Button:
text: "Slideshow"
GridLayout:
cols: 2
Button:
text: "Burger"
Button:
text: "Drinks"
on_release: app.root.current = "other"
Button:
text: "Fries"
Button:
text: "Others"
Label:
text: "Your Cart"
font_size: 40
color:(0,0,0,1)
size_hint_y: None
canvas.before:
Color:
rgba:150,10,200,0.5
Rectangle:
pos: self.pos
size: self.size
<AnotherScreen>:
name: "other"
canvas.before:
Color:
rgba: 1, 1, 1, 1
Rectangle:
pos: self.pos
size: self.size
BoxLayout:
size:root.size
orientation: 'vertical'
GridLayout:
size_hint_y:0.1
orientation: 'vertical'
rows: 1
Button:
color: 1,1,1,1
font_size: 25
size_hint_y:0.1
text: "Back Home"
on_release: app.root.current = "main"
Label:
text: "Project BAM"
canvas.before:
Color:
rgba: 0,0,0,1
Rectangle:
pos: self.pos
size: self.size
Button:
color: 1,1,1,1
font_size: 25
size_hint_y:0.1
text: "Profile"
on_release: app.root.current = "main"
Button:
color: 1,1,1,1
font_size: 25
size_hint_y:0.9
text: "Whats New"
on_release: app.root.current = "main"
GridLayout:
rows: 2
Button:
text: "Pepsi"
on_release: app.drinksSelect(1)
Button:
text: "7up"
on_release: app.drinksSelect(2)
Button:
text: "Fanta"
on_release: app.drinksSelect(3)
Button:
text: "Mountain Dew"
on_release: app.drinksSelect(4)
Button:
text: "Diet Pepsi"
on_release: app.drinksSelect(5)
Button:
text: "Sprite"
on_release: app.drinksSelect(6)
GridLayout:
id: drinksLayout
size_hint_y: 0.3
orientation: 'horizontal'
rows: 1
Button:
id: label1
size_hint: 0.2,0.4
background_normal:'1.jpg'
text: 'B1'
Button:
id: label2
size_hint: 0.2,0.4
background_normal:'1.jpg'
text: 'B1'
Button:
id: label3
size_hint: 0.2,0.4
background_normal:'1.jpg'
text: 'B1'
最佳答案
好吧，问题出在您的 drinksSelect 方法上，您还需要保留屏幕的值
试试这个:
py:
from kivy.app import App
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.lang.builder import Builder
from kivy.uix.stacklayout import StackLayout
from kivy.uix.button import Button
from kivy.properties import ObjectProperty
class MainScreen(Screen):
pass
class AnotherScreen(Screen):
dl = ObjectProperty()
l = 0
limit = 3 # Fix your limit here 3 is an example
class ScreenManagement(ScreenManager):
m_s = ObjectProperty() # Here I will keep the value of the MainScreen
a_s = ObjectProperty() # Here the AnotherScreen so I can use them later
class Stacks(StackLayout):
pass
present = Builder.load_file('hellokivy2.kv') # Specifying location of kv file
class MainApp(App):
def build(self):
return present
def drinksSelect(self,value): # creating a button by referring the id of the layout in which to create button
print(value)
if self.root.a_s.l < self.root.a_s.limit: # You know what I mean
button = Button(text=str(value), size_hint= (0.2,0.4))
self.root.a_s.ids['place_remaining'].add_widget(button)
self.root.a_s.l += 1
if __name__ == "__main__":
MainApp().run()
kv:
#: import FadeTransition kivy.uix.screenmanager.FadeTransition
ScreenManagement:
m_s: m_s # so I can use it in the .py file
a_s:a_s # same here
transition: FadeTransition()
MainScreen:
id: m_s
AnotherScreen:
id: a_s
<MainScreen>:
name: "main"
canvas.before:
Color:
rgba: 1, 1, 1, 1
Rectangle:
pos: self.pos
size: self.size
BoxLayout:
orientation: 'vertical'
size:root.size
Button:
text: "Slideshow"
GridLayout:
cols: 2
Button:
text: "Burger"
Button:
text: "Drinks"
on_release: app.root.current = "other"
Button:
text: "Fries"
Button:
text: "Others"
Label:
text: "Your Cart"
font_size: 40
color:(0,0,0,1)
size_hint_y: None
canvas.before:
Color:
rgba:150,10,200,0.5
Rectangle:
pos: self.pos
size: self.size
<AnotherScreen>:
name: "other"
dl : drinksLayout
canvas.before:
Color:
rgba: 1, 1, 1, 1
Rectangle:
pos: self.pos
size: self.size
BoxLayout:
size:root.size
orientation: 'vertical'
GridLayout:
size_hint_y:0.1
orientation: 'vertical'
rows: 1
Button:
color: 1,1,1,1
font_size: 25
size_hint_y:0.1
text: "Back Home"
on_release: app.root.current = "main"
Label:
text: "Project BAM"
canvas.before:
Color:
rgba: 0,0,0,1
Rectangle:
pos: self.pos
size: self.size
Button:
color: 1,1,1,1
font_size: 25
size_hint_y:0.1
text: "Profile"
on_release: app.root.current = "main"
Button:
color: 1,1,1,1
font_size: 25
size_hint_y:0.9
text: "Whats New"
on_release: app.root.current = "main"
GridLayout:
rows: 2
Button:
text: "Pepsi"
on_release: app.drinksSelect(1)
Button:
text: "7up"
on_release: app.drinksSelect(2)
Button:
text: "Fanta"
on_release: app.drinksSelect(3)
Button:
text: "Mountain Dew"
on_release: app.drinksSelect(4)
Button:
text: "Diet Pepsi"
on_release: app.drinksSelect(5)
Button:
text: "Sprite"
on_release: app.drinksSelect(6)
GridLayout:
id: drinksLayout
size_hint_y: 0.3
orientation: 'horizontal'
rows: 1
GridLayout:
id: place_remaining
rows: 1
size_hint_x: 80
Button:
id: label1
width: 40 # Set the size_hint_x to None and then set the width if you want a fixed dimension
size_hint: None,0.4
background_normal:'1.jpg'
text: 'B1'
Button:
id: label2
width: 40
size_hint: None,0.4
background_normal:'1.jpg'
text: 'B1'
Button:
id: label3
width: 40
size_hint: None,0.4
background_normal:'1.jpg'
text: 'B1'
输出:
我希望代码现在有点清楚了
关于python - KIVY:按下按钮时在子布局中添加按钮(on_release)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/46984515/