具有多项选择的 kivy 微调器小部件

问题描述

我正在寻找微调器(或类似的东西)类型的 kivy 小部件(最好在 python + kv 文件中)，例如，我可以通过复选框选择多个项目.所选项目应在元组 (?) 中可用.

I am looking for a kivy widget (preferrably in python + kv file) of type spinner (or something alike) where I can select multiple items through a checkbox for example. The selected items should become available in a tuple (?).

在图片start.png中你会发现开始的情况.

In the picture start.png you will find the starting situation.

在表单中有一个标签和一个文本输入字段.单击时应弹出一个包含可用选项的列表.为此，我正在使用 Spinner 小部件.见图片select.png

In a form there is a label and a Textinput field. On click a list with available options should popup. For this I am using a Spinner widget. See picture select.png

我想从此列表中选择多个项目.在Nederlands"旁边的示例中，我选择了English".

From this list I want to select multiple items. In the example next to 'Nederlands' I have selected 'English'.

完成后，文本输入字段应在逗号分隔列表中显示所选项目.见图片结果.png

When done, the Text input field should show the selected items in a comma separated list. See picture result.png

我已经在 e ListView 中使用多选模式进行了尝试.但是 ListView 绑定在 Textfield 区域中.我试图将 ListView 放在弹出窗口中.但这无论出于何种原因都行不通....

I have tried this with e ListView using the multiple selection mode. But the ListView is bound in the Textfield area. I have tried to put the ListView in a popup window. But this doesn't work-out either for some or other reason....

非常感谢任何建议.提前致谢.

Any suggestions are highly appreciated. Thanks in advance.

推荐答案

Kivy 默认没有这样的小部件，但是使用 Button+DropDown+ToggleButton 很容易创建自定义.

Kivy does not have such widget by default, but it is quite easy to create the custom one using Button+DropDown+ToggleButton.

from kivy.base import runTouchApp
from kivy.lang import Builder
from kivy.factory import Factory
from kivy.properties import ListProperty, ObjectProperty
from kivy.uix.dropdown import DropDown
from kivy.uix.button import Button

class MultiSelectSpinner(Button):
    """Widget allowing to select multiple text options."""

    dropdown = ObjectProperty(None)
    """(internal) DropDown used with MultiSelectSpinner."""

    values = ListProperty([])
    """Values to choose from."""

    selected_values = ListProperty([])
    """List of values selected by the user."""

    def __init__(self, **kwargs):
        self.bind(dropdown=self.update_dropdown)
        self.bind(values=self.update_dropdown)
        super(MultiSelectSpinner, self).__init__(**kwargs)
        self.bind(on_release=self.toggle_dropdown)

    def toggle_dropdown(self, *args):
        if self.dropdown.parent:
            self.dropdown.dismiss()
        else:
            self.dropdown.open(self)

    def update_dropdown(self, *args):
        if not self.dropdown:
            self.dropdown = DropDown()
        values = self.values
        if values:
            if self.dropdown.children:
                self.dropdown.clear_widgets()
            for value in values:
                b = Factory.MultiSelectOption(text=value)
                b.bind(state=self.select_value)
                self.dropdown.add_widget(b)

    def select_value(self, instance, value):
        if value == 'down':
            if instance.text not in self.selected_values:
                self.selected_values.append(instance.text)
        else:
            if instance.text in self.selected_values:
                self.selected_values.remove(instance.text)

    def on_selected_values(self, instance, value):
        if value:
            self.text = ', '.join(value)
        else:
            self.text = ''


kv = '''
BoxLayout:
    orientation: 'vertical'

    BoxLayout:

        Label:
            text: 'Select city'

        MultiSelectSpinner:
            id: city
            values: 'Sydney', 'Moscow', 'Warsaw', 'New York', 'Tokio'

    BoxLayout:

        Label:
            text: 'Select your favorite food'

        MultiSelectSpinner:
            id: food
            values: 'Fish and chips', 'Hot-dog', 'Hamburger'

    Label:
        text: 'You selected {} cities and {} as your favourite food.'.format(city.text, food.text)

<MultiSelectOption@ToggleButton>:
    size_hint: 1, None
    height: '48dp'

'''

runTouchApp(Builder.load_string(kv))

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