如何在kivy中使用RecycleView？

Question

根据 kivy 文档上发布的有关回收视图的代码，我该如何更改数据？如何更改可选标签的大小？特别是如果我想在屏幕上有更多的小部件，如何将列表的位置设置在屏幕的底部？

我尝试使用 GridLayout、BoxLayout 更改位置，但没有任何反应。

'''
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.recycleview import RecycleView
from kivy.uix.recycleview.views import RecycleDataViewBehavior
from kivy.uix.label import Label
from kivy.properties import BooleanProperty
from kivy.uix.recycleboxlayout import RecycleBoxLayout
from kivy.uix.behaviors import FocusBehavior
from kivy.uix.recycleview.layout import LayoutSelectionBehavior

Builder.load_string('''
<SelectableLabel>:
    # Draw a background to indicate selection
    canvas.before:
        Color:
            rgba: (.0, 0.9, .1, .3) if self.selected else (0, 0, 0, 1)
        Rectangle:
            pos: self.pos
            size: self.size
<RV>:
    viewclass: 'SelectableLabel'
    SelectableRecycleBoxLayout:
        default_size: None, dp(56)
        default_size_hint: 1, None
        size_hint_y: None
        height: self.minimum_height
        orientation: 'vertical'
        multiselect: True
        touch_multiselect: True
''')


class SelectableRecycleBoxLayout(FocusBehavior, LayoutSelectionBehavior,
                                 RecycleBoxLayout):
    ''' Adds selection and focus behaviour to the view. '''


class SelectableLabel(RecycleDataViewBehavior, Label):
    ''' Add selection support to the Label '''
    index = None
    selected = BooleanProperty(False)
    selectable = BooleanProperty(True)

    def refresh_view_attrs(self, rv, index, data):
        ''' Catch and handle the view changes '''
        self.index = index
        return super(SelectableLabel, self).refresh_view_attrs(
            rv, index, data)

    def on_touch_down(self, touch):
        ''' Add selection on touch down '''
        if super(SelectableLabel, self).on_touch_down(touch):
            return True
        if self.collide_point(*touch.pos) and self.selectable:
            return self.parent.select_with_touch(self.index, touch)

    def apply_selection(self, rv, index, is_selected):
        ''' Respond to the selection of items in the view. '''
        self.selected = is_selected
        if is_selected:
            print("selection changed to {0}".format(rv.data[index]))
        else:
            print("selection removed for {0}".format(rv.data[index]))

class RV(RecycleView):
    def __init__(self, **kwargs):
        super(RV, self).__init__(**kwargs)
        self.data = [{'text': str(x)} for x in range(100)]


class TestApp(App):
    def build(self):
        return RV()

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

'''

Answer 1

问题 1

How do I change the data?

回答

通过更新更改数据self.data

RecycleView » data

The RecycleView is generatad by processing the data (i.e. self.data), essentially a list of dicts, and uses these dicts to generate instances of the viewclass as required.

问题 2

How to change the size of the selectable labels?

回答

可以在 Python 脚本或 kv 文件中更改每个可选小部件的大小，尤其是高度。

参考这个例子，在SelectableRecycleBoxLayout设置default_size: None, dp(30)可以改变高度。至于每个可选择的小部件的宽度，它会根据一行数据中的列数而变化，self.data

有了 SelectableRecycleGridLayout，可以使用 cols_minimum

指定每一列的最小宽度

问题 3

If I want to have more widget on the screen, how to set the position of the list to be in the bottom side of the screen?

回答

声明继承BoxLayout

片段

<RootWidget>:
    orientation: 'vertical'
    BoxLayout:
        size_hint: 1, 0.8
    BoxLayout:
        size_hint: 1, 0.2
        RV:

如何在kivy中使用RecycleView？

How to use RecycleView in kivy?

python

kivy

recyclerview-layout

问题 1

回答

问题 2

回答

问题 3

回答

片段

输出

例子