問題描述

我想使用 DropDown 類獲得一個簡單的組合框，例如小部件.我可以使用 python 代碼來完成，但是否可以只使用 kv 語言?

I wanted to get a simple combo box like widget using the DropDown class. I can do it using python code, but is it possible using just kv language?

我嘗試了以下方法.這是我的python代碼:

I tried the following. Here's my python code:

class CustomDropDown(DropDown):
   pass

class MainForm(BoxLayout):
    pass

class MainApp(App):
    def build(self):
        self.dropdown = CustomDropDown()
        self.mainForm = MainForm()
        return self.mainForm
    def do_something(self):
        self.dropdown.open(self.mainForm)

MainApp().run()

這是 kv 文件:

<MainForm>:
    Button:
        text: 'Press'
        size_hint: [None,None]
        height: '40dp'
        on_release: app.do_something()
<CustomDropDown>:
    Button:
        text: 'First Item'
    Label:
        text: 'Disabled item'
    Button:
        text: 'Second Item'

但這不起作用.你能建議點什么嗎?任何幫助表示贊賞.

But this is not working. Can you please suggest something? Any help is appreciated.

推薦答案

是的，可以使用kivy語言.

Yes, it's possible using kivy language.

您可以閱讀 DropDownList 或 Spinner 通過這些鏈接.此外，如果您想了解更多關于他們的工作，您可能需要查看此 kivy-showcase的鏈接

You can read about DropDownList or Spinner through these links. And also if you want to know more on their working, you might want to check this link for kivy-showcase

我認為代碼是不言自明的.(on_select 方法)

I think the code is self explanatory.(on_select method)

這是 main.py 文件

This is the main.py file

from kivy.app import App
from kivy.uix.dropdown import DropDown
from kivy.uix.boxlayout import BoxLayout

class CustomDropDown(BoxLayout):
    pass

class MainApp(App):
    def build(self):
        return CustomDropDown()
if __name__=='__main__':
    MainApp().run()

這是main.kv文件

This is the main.kv file

<CustomDropDown>:

    Button:
        id: btn
        text: 'Press'
        on_release: dropdown.open(self)
        size_hint_y: None
        height: '48dp'

    DropDown:

        id: dropdown
        on_parent: self.dismiss()
        on_select: btn.text = '{}'.format(args[1])

        Button:
            text: 'First Item'
            size_hint_y: None
            height: '48dp'
            on_release: dropdown.select('First Item')

        Label:
            text: 'Second Item'
            size_hint_y: None
            height: '48dp'

        Button:
            text: 'Third Item'
            size_hint_y: None
            height: '48dp'
            on_release: dropdown.select('Third Item')

這篇關于僅使用 kv 文件在 kivy 中創建 DropDown的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！