Question

我的问题在于访问container的{{1}}属性，默认情况下为DropDown且包含它的子级。

简单应用：

GridLayout

我尝试使用from kivy.app import App from kivy.uix.boxlayout import BoxLayout from kivy.uix.dropdown import DropDown from kivy.uix.button import Button from kivy.uix.label import Label class TestApp(App): def build(self): root = BoxLayout(orientation='vertical') dropdown = DropDown() for i in range(3): dropdown.add_widget(Button( text=str(i), size_hint_y=None )) # add 3 buttons to dropdown dropdown.container.bind(spacing=8) # this line does not work dropdown_button = Button(size_hint_y=.2, text='Open DropDown') dropdown_button.bind(on_release=dropdown.open) root.add_widget(dropdown_button) root.add_widget(Label()) # empty space under button return root TestApp().run()方法，但没有结果。没有设置缩进。我也希望看到kivy语言的解决方案，因为我想使用bind函数来设置间距，并且将参数传递给python文件并不是很方便。提前感谢您的帮助。

Answer 1

而是使用bind，您应该直接设置值：

from kivy.app import App

from kivy.uix.boxlayout import BoxLayout
from kivy.uix.dropdown import DropDown
from kivy.uix.button import Button
from kivy.uix.widget import Widget


class TestApp(App):
    def build(self):
        root = BoxLayout(orientation='vertical')
        dropdown = DropDown()

        for i in range(3):
            dropdown.add_widget(Button(
                text=str(i),
                size_hint_y=None
            )) # add 3 buttons to dropdown

        dropdown.container.spacing = 10
        dropdown.container.padding = (0, 10, 0, 0)

        dropdown_button = Button(size_hint_y=.2, text='Open DropDown')
        dropdown_button.bind(on_release=dropdown.open)

        root.add_widget(dropdown_button)
        root.add_widget(Widget()) # empty space under button
        return root

TestApp().run()

不直接使用自定义容器类。你可以这样做，但它的hacky和丑陋：

from kivy.app import App

from kivy.uix.boxlayout import BoxLayout
from kivy.uix.gridlayout import GridLayout
from kivy.uix.dropdown import DropDown
from kivy.uix.button import Button
from kivy.uix.widget import Widget

from kivy.lang import Builder

Builder.load_string('''
<MyContainer>:
    # copied from kivy.uix.dropdown._grid_kv
    size_hint_y: None
    height: self.minimum_size[1]
    cols: 1
    # custom settings
    spacing: 10
    padding: (0, 10, 0, 0)
''')

class MyContainer(GridLayout):
    pass


class TestApp(App):
    def build(self):
        root = BoxLayout(orientation='vertical')

        container = MyContainer()
        dropdown = DropDown(container=container)
        super(DropDown, dropdown).add_widget(container)
        dropdown.on_container(dropdown, container)

        for i in range(3):
            dropdown.add_widget(Button(
                text=str(i),
                size_hint_y=None
            )) # add 3 buttons to dropdown

        dropdown_button = Button(size_hint_y=.2, text='Open DropDown')
        dropdown_button.bind(on_release=dropdown.open)

        root.add_widget(dropdown_button)
        root.add_widget(Widget()) # empty space under button
        return root

TestApp().run()

所以我说它更干净，将自定义间距类作为Widget的子类来填充按钮之间的空间：

from kivy.app import App

from kivy.uix.boxlayout import BoxLayout
from kivy.uix.dropdown import DropDown
from kivy.uix.button import Button
from kivy.uix.widget import Widget

from kivy.lang import Builder

Builder.load_string('''
<DropDownSpacing>:
    size_hint_y: None
    height: 20
''')

class DropDownSpacing(Widget):
    pass


class TestApp(App):
    def build(self):
        root = BoxLayout(orientation='vertical')
        dropdown = DropDown()

        for i in range(3):
            dropdown.add_widget(DropDownSpacing())

            dropdown.add_widget(Button(
                text=str(i),
                size_hint_y=None
            )) # add 3 buttons to dropdown

        dropdown_button = Button(size_hint_y=.2, text='Open DropDown')
        dropdown_button.bind(on_release=dropdown.open)

        root.add_widget(dropdown_button)
        root.add_widget(Widget()) # empty space under button
        return root

TestApp().run()

这与您在主BoxLayout中执行的操作相同，但我更喜欢直接使用Widget课程，而不是Label而没有文字。

在kivy中添加下拉项之间的间距

1 个答案: