Kivy中的RecycleView模块

我也在寻找同样的东西,我不喜欢kv-lang,还没有确信它比用代码做任何事情都好。

样本来自 https://kivy.org/docs/api-kivy.uix.recycleview.html#kivy.uix.recycleview.RecycleView 将按如下方式创建。

from kivy.app import App
from kivy.graphics import Color, Rectangle
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

class SelectableRecycleBoxLayout(FocusBehavior, LayoutSelectionBehavior,
                                 RecycleBoxLayout):
    ''' Adds selection and focus behaviour to the view. '''
    def __init__(self, **kw):
        super().__init__(**kw, default_size=(0, 28), default_size_hint=(1, None), size_hint_y=None,
                         touch_multiselect=True, multiselect=True, orientation='vertical')

        self.bind(minimum_height=self._min)

    def _min(self, inst, val):
        self.height = val

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

    def __init__(self, **kw):
        super().__init__(**kw)
        self.canvas.before.clear()
        with self.canvas.before:
            if self.selected:
                Color(.0, 0.9, .1, .3)
            else:
                Color(0, 0, 0, 1)
            self.rect = Rectangle(size=self.size, pos=self.pos)
        self.bind(size=self._update_rect, pos=self._update_rect)

    def _update_rect(self, inst, value):
        self.rect.pos = inst.pos
        self.rect.size = inst.size

    def refresh_view_attrs(self, rv, index, data):
        ''' Catch and handle the view changes '''
        self.index = index
        return super().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]))
        self.canvas.before.clear()
        with self.canvas.before:
            if self.selected:
                Color(.0, 0.9, .1, .3)
            else:
                Color(0, 0, 0, 1)
            self.rect = Rectangle(size=self.size, pos=self.pos)


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


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

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

KV级的顺序很重要。不确定什么 需要 去哪里,但自我。添加小部件后,需要修改数据。

我不是Kivy的专家,但我强烈建议您使用 kv lang 尽可能多。它只不过是一个简洁的python,它将使您的代码更加干净。
如果您阅读文档 RecycleBoxLayout 它是高度实验性的,你应该利用有效的方法。

话虽如此,您的代码看起来不错,但有几个问题。

1) 更换 self.viewclass = Label 具有 self.viewclass = 'Label' 和
2) 您尚未指定 height , size 和 orientation 您的 循环利用布局 在python代码中。