问题描述

我在 kivy 中使用 multiTab.如何放大滚动条，以便鼠标可以移动(up_down)滚动条.我正在使用 BoxLayout 和 RecycleView.下面的代码使用的是 gridLayout，但不在 BoxLayout 中:

I am using multiTab in kivy. How to enlarge the scrollbar so that scrollbar can be moved(up_down) by mouse. I am using BoxLayout and RecycleView. The code below was working with gridLayout, but not in BoxLayout:

layout.bind(minimum_height=layout.setter('height'))

推荐答案

这是一个如何扩展 ScrollView 以获得可拖动滑块的示例.

Here is an example of how to extend ScrollView to also get a dragable slider.

from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.lang import Builder
from kivy.uix.label import Label

Builder.load_string("""
<ScrollSlider>:
    ScrollView:
        id: scrlvw
        bar_width: 0
        GridLayout:
            id: grid
            size_hint_y:None
            cols:1
            height: self.minimum_height
            scroll_y: slider.value
            on_touch_move: slider.value = self.scroll_y
    Slider:
        size_hint_x: None
        width: root.width*0.2
        id: slider
        min: 0
        max: 1
        orientation: 'vertical'
        value: scrlvw.scroll_y
        on_value: scrlvw.scroll_y = self.value

""")


class ScrollSlider(BoxLayout):

    def custom_add(self, widget):
        self.ids.grid.add_widget(widget)

class MyApp(App):


    def build(self):
        scrollslider = ScrollSlider()
        for i in range(1, 100):
            scrollslider.custom_add(Label(text=str(i), height=100, size_hint_y=None))
        return scrollslider

if __name__ == '__main__':
    MyApp().run()

你需要使用custom_add在ScrollSlider中添加widget或者在kivy中添加到GridLayout中.

You need to use the custom_add to add widgets in the ScrollSlider or add them to the GridLayout in kivy.

我从@Edvardas Dlugauskas 提供的链接中获得了一些灵感.

I took some inspiration from the link @Edvardas Dlugauskas provided.

您提供的代码不适用于 BoxLayout，因为 BoxLayout 只占用其父级的大小.为了能够滚动，您需要将 sth 添加到比 ScrollView 本身大的 ScrollView 中.

The code you provided does not work with BoxLayout because BoxLayout just takes the size of its parent. To be able to scroll you need to add sth into ScrollView which is larger than the ScrollView itself.

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