我想编写一个带有 KivyMD 的移动应用程序，例如底部工作表菜单。我对 KivyMD Buttom Sheet 的问题是，当我单击按钮打开它时，需要很长时间（取决于菜单长度），因为每次按下按钮时都会调用该函数来生成列表。所以我想为此编写自己的解决方案。 在我的 kv 文件中，我手动添加了 20 个按钮来查看，一切正常。但是我没有找到在带有循环的python文件中做到这一点的方法。 任何人都可以帮我添加 30 多个按钮到 modalview 以使其可滚动吗？
这是我的python文件：
from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.lang import Builder
from kivy.core.window import Window
Builder.load_file('mylayout.kv')
Window.size = (350, 700)
class MyLayout(BoxLayout):
pass
class MainApp(App):
def build(self):
return MyLayout()
MainApp().run()
我的 kv 文件：
#:import Factory kivy.factory.Factory
<MyPopup@ModalView>
auto_dismiss: True
size_hint: 1, 0.5
pos_hint: {'x': 0, 'top': 0.5}
background_color: 0,0,0,0
background_normal: ''
canvas.before:
Color:
rgba: 48/150,84/150,150/150,1
Rectangle:
size: self.size
pos: self.pos
ScrollView:
#do_scroll_x: False
GridLayout:
id: container1
cols: 1
size_hint: None, None
size: root.width, 1200
pos_hint: {'center_x': .5, 'center_y': .5}
MyButton:
text: '1'
on_press:
root.dismiss()
print(1)
MyButton:
text: '2'
on_press:
root.dismiss()
print(2)
MyButton:
text: '3'
on_press:
root.dismiss()
print(3)
MyButton:
text: '4'
on_press:
root.dismiss()
print(4)
MyButton:
text: '5'
on_press:
root.dismiss()
print(5)
MyButton:
text: '6'
on_press:
root.dismiss()
print(6)
MyButton:
text: '7'
on_press:
root.dismiss()
print(7)
MyButton:
text: '8'
on_press:
root.dismiss()
print(8)
MyButton:
text: '9'
on_press:
root.dismiss()
print(9)
MyButton:
text: '10'
on_press:
root.dismiss()
print(10)
MyButton:
text: '11'
on_press:
root.dismiss()
print(11)
MyButton:
text: '12'
on_press:
root.dismiss()
print(12)
MyButton:
text: '13'
on_press:
root.dismiss()
print(13)
MyButton:
text: '14'
on_press:
root.dismiss()
print(14)
MyButton:
text: '15'
on_press:
root.dismiss()
print(15)
MyButton:
text: '16'
on_press:
root.dismiss()
print(16)
MyButton:
text: '17'
on_press:
root.dismiss()
print(17)
MyButton:
text: '18'
on_press:
root.dismiss()
print(18)
MyButton:
text: '19'
on_press:
root.dismiss()
print(19)
MyButton:
text: '20'
on_press:
root.dismiss()
print(20)
<MyLayout>
orientation: 'vertical'
size: root.width, root.height
Label:
size_hint: 1, 0.9
text: 'main'
font_size: 24
Button:
size_hint: 1, 0.1
text: 'menu'
font_size: 24
on_release: Factory.MyPopup().open()
<MyButton@Button>
background_color: 0,0,0,0
background_normal: ''
canvas.before:
Color:
rgba: (48/255,84/255,150/255,1) if self.state == 'normal' else (43/255,108/255,229/255,1)
Rectangle:
size: self.size
pos: self.pos
答案 0 :(得分：1)
为了构建用 MyPopup 填充的 MyButtons，您必须在 python 代码中定义这些类或使用 Factory 创建实例。这是您的 kv 的修改版本：
<MyPopup@ModalView>
auto_dismiss: True
size_hint: 1, 0.5
pos_hint: {'x': 0, 'top': 0.5}
background_color: 0,0,0,0
background_normal: ''
canvas.before:
Color:
rgba: 48/150,84/150,150/150,1
Rectangle:
size: self.size
pos: self.pos
ScrollView:
#do_scroll_x: False
GridLayout:
id: container1
cols: 1
size_hint: None, None
width: root.width
height: self.minimum_height # let the GridLayout set its own height as needeed
pos_hint: {'center_x': .5, 'center_y': .5}
<MyLayout>
orientation: 'vertical'
size: root.width, root.height
Label:
size_hint: 1, 0.9
text: 'main'
font_size: 24
Button:
size_hint: 1, 0.1
text: 'menu'
font_size: 24
# on_release: Factory.MyPopup().open()
on_release: app.open_popup() # call app method to build MyPopup and fill it
<MyButton@Button>
background_color: 0,0,0,0
background_normal: ''
size_hint_y: None
height: 20
canvas.before:
Color:
rgba: (48/255,84/255,150/255,1) if self.state == 'normal' else (43/255,108/255,229/255,1)
Rectangle:
size: self.size
pos: self.pos
请注意，GridLayout 高度设置为 self.minimum_height 以允许任意数量的 MyButton 子项，并且 MyButton 高度设置为固定值（以便GridLayout 可以计算最小高度）。此外，Factory 中不再需要导入 kv。
修改后的python代码：
from kivy.app import App
from kivy.factory import Factory
from kivy.uix.boxlayout import BoxLayout
from kivy.lang import Builder
from kivy.core.window import Window
Builder.load_file('mylayout.kv')
Window.size = (350, 700)
class MyLayout(BoxLayout):
pass
class MainApp(App):
def build(self):
return MyLayout()
def open_popup(self, *args):
# create the popup (must use Factory since MyPopup is defined in kv)
self.popup = Factory.MyPopup()
# fill the GridLayout
grid = self.popup.ids.container1
for i in range(60):
grid.add_widget(Factory.MyButton(text=str(i), on_press=self.myButtPress))
# open popup
self.popup.open()
def myButtPress(self, butt):
print(butt.text)
self.popup.dismiss()
MainApp().run()