如何在 Kivy Listview 中格式化滚动条

Question

我有一个 ListView，其中包含列表项的自定义按钮。我如何格式化滚动条使其始终可见（如果有东西要滚动......），使其更宽（10 pts 而不是默认的 2 pts）并给它不同的颜色？

DoScroll.py 文件：

from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.listview import ListItemButton

class ShowItems(BoxLayout):
    def get_list(self):
        self.results.item_strings = {"A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z"}

    def show_capital(self, capital):
        print capital

class CapitalButton(ListItemButton):
    pass

class DoScrollApp(App):
    pass

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

这里是 DoScroll.kv 文件。

#: import DoScroll DoScroll
#: import ListAdapter kivy.adapters.listadapter.ListAdapter


<CapitalButton>:
    text_size: self.width - 50, None
    halign: 'left'
    valign: 'middle'
    font_size: 16
    on_press: app.root.show_capital(self.text)

ShowItems:

<ShowItems>:
    results: results_list
    orientation: "vertical"
    BoxLayout:
        height: "40dp"
        size_hint_y: None
        Button:
            text: "Get the list"
            on_press: root.get_list()
    ListView:
        id: results_list
        adapter:
            ListAdapter(data=[], args_converter=lambda row_index, 
                an_obj: {'text': an_obj,'size_hint_y': None,'height': 40}, cls=DoScroll.CapitalButton)

Answer 1

ListView 包含一个 ScrollView，它又持有 GridView 持有列表项。相应的 kv 规则是这些（来自 listview.py）：

<ListView>:
    container: container
    ScrollView:
        pos: root.pos
        on_scroll_y: root._scroll(args[1])
        do_scroll_x: False
        GridLayout:
            cols: 1
            id: container
            size_hint_y: None

ScrollView 具有属性 bar_width、bar_color、bar_inactive_color。这些可以通过 lv.container.parent.bar_width 等访问，对于 lv = ListView()。

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