Kivy RecycleView.如何在删除数据后刷新屏幕

Question

我想做的是找到一种方法来刷新使用recycleview、制作的表

如果你按下一个创建的标签，我的代码会从表中删除数据，但不会在图形级上刷新表

显然，如果你按两次相同的标签，python会给出ValueError。。。

这是我的代码：临时

from kivy.uix.screenmanager import Screen
from kivy.app import App
from kivy.uix.label import Label
from kivy.uix.recycleview.views import RecycleDataViewBehavior
from kivy.properties import BooleanProperty
from kivy.properties import ListProperty
class Sfondo_tabella(RecycleDataViewBehavior, Label):
index = None
selected = BooleanProperty(False)
selectable = BooleanProperty(True)
def on_touch_down(self, touch):
if self.collide_point(*touch.pos) and self.selectable:
x = Screen_1()
x.remove(self.text)
class Screen_1(Screen):
data_items = ListProperty([])
data_items = ['1', '2', '3']
def remove(self, data):
self.data_items.remove(data)
class TempApp(App):
pass
if __name__ == '__main__':
TempApp().run()

temp.kv

ScreenManager:
id: screen_manager
name: "screen_manager"
Screen_1:
id: screen_1
name: "Screen_1"
manager: screen_manager
<Sfondo_tabella>:
# Draw a background to indicate selection
color: 0,0,0,1
font_size:  self.height * 0.5
text_size: self.width, None
valign: 'top'
halign: 'center'
canvas.before:
Color:
rgba: (1, 1, 1, 1)
Rectangle:
pos: self.pos
size: self.size
canvas:
Color:
rgba:0,0,0,1
Line:
width:0.5
rectangle:(self.x,self.y,self.width,self.height)

<Screen_1>:
BoxLayout:
RecycleView:
viewclass: 'Sfondo_tabella'
data: [{'text': str(x)} for x in root.data_items]
RecycleGridLayout:
cols: 10
size_hint: 1, None
default_size: None, dp(20)
default_size_hint: 1, None
height: self.minimum_height
width: self.minimum_width

Answer 1

在您的代码中，您没有更新RecycleView数据。refresh_view_attrs函数应该重载，以获得点击/触摸的标签的index，然后需要相应地更新数据。以下是temp.py的更新代码：

from kivy.uix.screenmanager import Screen
from kivy.app import App
from kivy.uix.label import Label
from kivy.uix.recycleview.views import RecycleDataViewBehavior
from kivy.properties import BooleanProperty
from kivy.properties import ListProperty
class Sfondo_tabella(RecycleDataViewBehavior, Label):
index = None
selected = BooleanProperty(False)
selectable = BooleanProperty(True)
def refresh_view_attrs(self, rv, index, data):
self.index = index
return super(Sfondo_tabella, self).refresh_view_attrs(rv, index, data)
def on_touch_down(self, touch):
if self.collide_point(*touch.pos) and self.selectable:
x = Screen_1()
x.remove(self.text)
self.parent.parent.data.pop(self.index)
class Screen_1(Screen):
data_items = ListProperty([])
data_items = ['1', '2', '3']
def remove(self, data):
self.data_items.remove(data)
class TempApp(App):
pass
if __name__ == '__main__':
TempApp().run()

这将适当地更新RecycleView的数据并相应地更新GUI。