如何将所选项目从 recyclerview 显示到文本输入
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【中文标题】如何将所选项目从 recyclerview 显示到文本输入【英文标题】：How can I dispaly the selected item from recycleview to the texinput 【发布时间】：2021-03-23 20:02:04 【问题描述】：在下面的代码中，我想将 recycleview 中的选定项目显示到来自 MyTextInput 类的 text_box1，并且在文本框中显示的代码在 SelectableLabel 类中 --> 方法 apply_selection。
当我打印所选项目时，它会打印在控制台上。当我尝试在文本输入中显示它时，它会显示错误。我应该做什么改变。带有代码的解决方案将很好理解。谢谢你
test.py 文件
from kivy.app import App
from kivy.uix.textinput import TextInput
from kivy.lang import Builder
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.floatlayout import FloatLayout
from kivy.properties import NumericProperty, ListProperty, BooleanProperty, ObjectProperty,StringProperty
from kivy.uix.recycleview import RecycleView
from kivy.uix.recyclegridlayout import RecycleGridLayout
from kivy.uix.recycleview.views import RecycleDataViewBehavior
from kivy.uix.label import Label
from kivy.uix.recycleboxlayout import RecycleBoxLayout
from kivy.uix.behaviors import FocusBehavior
from kivy.uix.recycleview.layout import LayoutSelectionBehavior
import pandas as pd
Builder.load_string('''
<Body>:
canvas:
Color:
rgba:(1, 1, 1, 1)
Rectangle:
# pos: self.pos
size: self.size
<DropDownWidget>:
canvas:
Color:
rgba:(1, 1, 1, 1)
Rectangle:
# pos: self.pos
size: self.size
# orientation: 'vertical'
spacing: 20
txt_input: txt_input
rv: rv
# txt_input1: txt_input1
MyTextInput:
id: txt_input1
pos: 400,300
size_hint_y: None
height: 50
MyTextInput:
id: txt_input
hint_text:'Enter here'
size_hint_y: None
height: 50
RV:
id: rv
<MyTextInput>:
readonly: False
multiline: False
<SelectableLabel>:
# Draw a background to indicate selection
color: 0,0,0,1
canvas.before:
Color:
rgba: (0, 0, 1, .5) if self.selected else (1, 1, 1, 1)
Rectangle:
# pos: self.pos
size: self.size
<RV>:
canvas:
Color:
rgba: 0,0,0,.2
Line:
rectangle: self.x +1 , self.y, self.width - 2, self.height -2
bar_width: 10
scroll_type:['bars']
viewclass: 'SelectableLabel'
SelectableRecycleBoxLayout:
default_size: None, dp(20)
default_size_hint: 1, None
size_hint_y: None
height: self.minimum_height
orientation: 'vertical'
multiselect: False
''')
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)
txt_input1 = ObjectProperty(None)
txt_input = ObjectProperty(None)
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:
self.ids.MyTextInput.txt_input1.text = str(rv.data[index])
print("selection changed to 0".format(rv.data[index]))
class RV(RecycleView):
def __init__(self, **kwargs):
super(RV, self).__init__(**kwargs)
class DropDownWidget(BoxLayout):
txt_input = ObjectProperty()
rv = ObjectProperty()
txt_input1 = ObjectProperty()
class MyTextInput(TextInput):
txt_input = ObjectProperty()
txt_input1 = ObjectProperty(None)
flt_list = ObjectProperty()
word_list = ListProperty()
# this is the variable storing the number to which the look-up will start
starting_no = NumericProperty(3)
suggestion_text = ''
def __init__(self, **kwargs):
super(MyTextInput, self).__init__(**kwargs)
def on_text(self, instance, value):
# find all the occurrence of the word
self.parent.ids.rv.data = []
matches = [self.word_list[i] for i in range(len(self.word_list)) if
self.word_list[i][:self.starting_no] == value[:self.starting_no]]
# display the data in the recycleview
display_data = []
for i in matches:
display_data.append('text': i)
self.parent.ids.rv.data = display_data
# ensure the size is okay
if len(matches) <= 10:
self.parent.height = (50 + (len(matches) * 20))
else:
self.parent.height = 240
def keyboard_on_key_down(self, window, keycode, text, modifiers):
if self.suggestion_text and keycode[1] == 'tab':
self.insert_text(self.suggestion_text + ' ')
return True
return super(MyTextInput, self).keyboard_on_key_down(window, keycode, text, modifiers)
class Body(FloatLayout):
def __init__(self, **kwargs):
f = pd.read_csv("stoploss.csv")
fl = len(f.index)
file = pd.DataFrame(f, columns=['Stock Symbol', 'Purchase Price', 'Stock Name', 'Stop Loss(%)'])
j = 0
wl = []
for i in range(fl):
for index in range(1):
columnSeriesObj = file.iloc[:, 2]
# pp = iter(columnSeriesObj.values)
# pp1 = next(pp)
# print(pp1)
wl.append(columnSeriesObj.values[i])
tp = tuple(wl)
print(str(tp))
# def convertTuple(tup):
# str = ''.join(tup)
# return str
# print(convertTuple(tp))
super(Body, self).__init__(**kwargs)
widget_1 = DropDownWidget(pos_hint='center_x': .5, 'center_y': .5,
size_hint=(None, None), size=(600, 60))
widget_1.ids.txt_input.word_list = wl
widget_1.ids.txt_input.starting_no = 3
self.add_widget(widget_1)
class MyApp(App):
def build(self):
return Body()
if __name__ == "__main__":
MyApp().run()
但我收到以下错误：
"C:\Users\Rushi Dada\AppData\Local\Programs\Python\Python37\python.exe" D:/FirebaseLoginScreen-master/try_code.py
[INFO ] [Logger ] Record log in C:\Users\Rushi Dada\.kivy\logs\kivy_20-12-12_86.txt
[INFO ] [deps ] Successfully imported "kivy_deps.gstreamer" 0.3.1
[INFO ] [deps ] Successfully imported "kivy_deps.angle" 0.1.10
[INFO ] [deps ] Successfully imported "kivy_deps.glew" 0.1.12
[INFO ] [deps ] Successfully imported "kivy_deps.sdl2" 0.1.23
[INFO ] [Kivy ] v1.11.1
[INFO ] [Kivy ] Installed at "C:\Users\Rushi Dada\AppData\Local\Programs\Python\Python37\lib\site-packages\kivy\__init__.py"
[INFO ] [Python ] v3.7.3 (v3.7.3:ef4ec6ed12, Mar 25 2019, 22:22:05) [MSC v.1916 64 bit (AMD64)]
[INFO ] [Python ] Interpreter at "C:\Users\Rushi Dada\AppData\Local\Programs\Python\Python37\python.exe"
[INFO ] [Factory ] 184 symbols loaded
[INFO ] [Image ] Providers: img_tex, img_dds, img_sdl2, img_pil, img_gif (img_ffpyplayer ignored)
[INFO ] [Text ] Provider: sdl2
('Tesla inc', 'Tata Motors Limited ', 'asv', 'tesla', 'ploul', 'fd', 's', 'asdsd', 'trtdfsddfdfd', 'abc')
[INFO ] [Window ] Provider: sdl2
[INFO ] [GL ] Using the "OpenGL" graphics system
[INFO ] [GL ] GLEW initialization succeeded
[INFO ] [GL ] Backend used <glew>
[INFO ] [GL ] OpenGL version <b'4.6.0 NVIDIA 391.35'>
[INFO ] [GL ] OpenGL vendor <b'NVIDIA Corporation'>
[INFO ] [GL ] OpenGL renderer <b'GeForce GT 635M/PCIe/SSE2'>
[INFO ] [GL ] OpenGL parsed version: 4, 6
[INFO ] [GL ] Shading version <b'4.60 NVIDIA'>
[INFO ] [GL ] Texture max size <16384>
[INFO ] [GL ] Texture max units <32>
[INFO ] [Window ] auto add sdl2 input provider
[INFO ] [Window ] virtual keyboard not allowed, single mode, not docked
[INFO ] [GL ] NPOT texture support is available
[INFO ] [Base ] Start application main loop
[INFO ] [Base ] Leaving application in progress...
Traceback (most recent call last):
File "kivy\properties.pyx", line 860, in kivy.properties.ObservableDict.__getattr__
KeyError: 'MyTextInput'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "D:/FirebaseLoginScreen-master/try_code.py", line 291, in <module>
MyApp().run()
File "C:\Users\Rushi Dada\AppData\Local\Programs\Python\Python37\lib\site-packages\kivy\app.py", line 855, in run
runTouchApp()
File "C:\Users\Rushi Dada\AppData\Local\Programs\Python\Python37\lib\site-packages\kivy\base.py", line 504, in runTouchApp
EventLoop.window.mainloop()
File "C:\Users\Rushi Dada\AppData\Local\Programs\Python\Python37\lib\site-packages\kivy\core\window\window_sdl2.py", line 747, in mainloop
self._mainloop()
File "C:\Users\Rushi Dada\AppData\Local\Programs\Python\Python37\lib\site-packages\kivy\core\window\window_sdl2.py", line 479, in _mainloop
EventLoop.idle()
File "C:\Users\Rushi Dada\AppData\Local\Programs\Python\Python37\lib\site-packages\kivy\base.py", line 342, in idle
self.dispatch_input()
File "C:\Users\Rushi Dada\AppData\Local\Programs\Python\Python37\lib\site-packages\kivy\base.py", line 327, in dispatch_input
post_dispatch_input(*pop(0))
File "C:\Users\Rushi Dada\AppData\Local\Programs\Python\Python37\lib\site-packages\kivy\base.py", line 233, in post_dispatch_input
listener.dispatch('on_motion', etype, me)
File "kivy\_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch
File "C:\Users\Rushi Dada\AppData\Local\Programs\Python\Python37\lib\site-packages\kivy\core\window\__init__.py", line 1402, in on_motion
self.dispatch('on_touch_down', me)
File "kivy\_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch
File "C:\Users\Rushi Dada\AppData\Local\Programs\Python\Python37\lib\site-packages\kivy\core\window\__init__.py", line 1418, in on_touch_down
if w.dispatch('on_touch_down', touch):
File "kivy\_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch
File "C:\Users\Rushi Dada\AppData\Local\Programs\Python\Python37\lib\site-packages\kivy\uix\widget.py", line 549, in on_touch_down
if child.dispatch('on_touch_down', touch):
File "kivy\_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch
File "C:\Users\Rushi Dada\AppData\Local\Programs\Python\Python37\lib\site-packages\kivy\uix\widget.py", line 549, in on_touch_down
if child.dispatch('on_touch_down', touch):
File "kivy\_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch
File "C:\Users\Rushi Dada\AppData\Local\Programs\Python\Python37\lib\site-packages\kivy\uix\scrollview.py", line 647, in on_touch_down
if self.dispatch('on_scroll_start', touch):
File "kivy\_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch
File "C:\Users\Rushi Dada\AppData\Local\Programs\Python\Python37\lib\site-packages\kivy\uix\scrollview.py", line 736, in on_scroll_start
return self.simulate_touch_down(touch)
File "C:\Users\Rushi Dada\AppData\Local\Programs\Python\Python37\lib\site-packages\kivy\uix\scrollview.py", line 642, in simulate_touch_down
ret = super(ScrollView, self).on_touch_down(touch)
File "C:\Users\Rushi Dada\AppData\Local\Programs\Python\Python37\lib\site-packages\kivy\uix\widget.py", line 549, in on_touch_down
if child.dispatch('on_touch_down', touch):
File "kivy\_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch
File "C:\Users\Rushi Dada\AppData\Local\Programs\Python\Python37\lib\site-packages\kivy\uix\behaviors\focus.py", line 443, in on_touch_down
return super(FocusBehavior, self).on_touch_down(touch)
File "C:\Users\Rushi Dada\AppData\Local\Programs\Python\Python37\lib\site-packages\kivy\uix\widget.py", line 549, in on_touch_down
if child.dispatch('on_touch_down', touch):
File "kivy\_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch
File "D:/FirebaseLoginScreen-master/try_code.py", line 192, in on_touch_down
return self.parent.select_with_touch(self.index, touch)
File "C:\Users\Rushi Dada\AppData\Local\Programs\Python\Python37\lib\site-packages\kivy\uix\behaviors\compoundselection.py", line 345, in select_with_touch
self.select_node(node)
File "C:\Users\Rushi Dada\AppData\Local\Programs\Python\Python37\lib\site-packages\kivy\uix\recycleview\layout.py", line 103, in select_node
self.apply_selection(node, view, True)
File "C:\Users\Rushi Dada\AppData\Local\Programs\Python\Python37\lib\site-packages\kivy\uix\recycleview\layout.py", line 143, in apply_selection
view.apply_selection(self.recycleview, index, is_selected)
File "D:/FirebaseLoginScreen-master/try_code.py", line 200, in apply_selection
self.ids.MyTextInput.txt_input1.text = str(rv.data[index])
File "kivy\properties.pyx", line 863, in kivy.properties.ObservableDict.__getattr__
AttributeError: 'super' object has no attribute '__getattr__'
Process finished with exit code 1
【问题讨论】：
【参考方案1】：您正在尝试使用
访问MyTextInput 实例
self.ids.MyTextInput.txt_input1.text = str(rv.data[index])
在SelectableLabel 类中，但SelectableLabel 实例根本没有ids，所以这不起作用。在您的代码中的任何地方都没有定义MyTextInput id。我猜您打算设置出现在您的DropDownWidget 中的MyTextInput 实例之一的text。
为了访问您在Body 类中创建的DropDownWidget，您只需在__init__() 方法中进行以下细微修改，即可保存对它的引用：
super(Body, self).__init__(**kwargs)
self.widget_1 = DropDownWidget(pos_hint='center_x': .5, 'center_y': .5,
size_hint=(None, None), size=(600, 60))
self.widget_1.ids.txt_input.word_list = wl
self.widget_1.ids.txt_input.starting_no = 3
self.add_widget(self.widget_1)
那么，在SelectableLabel的apply_selection()方法中，可以像这样调整MyTextInput的访问权限：
def apply_selection(self, rv, index, is_selected):
''' Respond to the selection of items in the view. '''
self.selected = is_selected
if is_selected:
# self.ids.MyTextInput.txt_input1.text = str(rv.data[index])
App.get_running_app().root.widget_1.ids.txt_input1.text = str(rv.data[index])
print("selection changed to 0".format(rv.data[index]))
【讨论】：
@Jahn Anderson 谢谢先生。有效。我在这一点上卡了很长时间。 我对上面的代码进行了一些更改，这些更改在单独的 .py 文件中按预期工作。但是当我在包含其他屏幕的主文件中复制相同的代码时，它现在显示错误。我在这里发布了新问题link 请完成以上问题 我已经发布了与这个问题相关的新问题..请看看link以上是关于如何将所选项目从 recyclerview 显示到文本输入的主要内容，如果未能解决你的问题，请参考以下文章
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