这是我的.py文件，我需要创建一个自动完成的textinput，我已经创建了textinput和RV类的子类recycleview和dropdown，但问题是它不是下降，而是下降到，当这个下降时，textinput是最小化，这是python文件。
from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.recycleview import RecycleView
from kivy.uix.dropdown import DropDown
from kivy.uix.scrollview import ScrollView
from kivy.lang import Builder
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
from kivy.properties import NumericProperty,ListProperty, BooleanProperty, ObjectProperty
from kivy.uix.textinput import TextInput
import sqlite3
from kivy.uix.button import Button
from collections import OrderedDict
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
class ListcreationWindow(BoxLayout):
code_inp = ObjectProperty()
flt_list = ObjectProperty()
word_list = ListProperty()
def __init__(self, **kwargs):
super(ListcreationWindow, self).__init__(**kwargs)
self.cart = []
self.qty = []
self.total = 0.00
class MyLayout(BoxLayout):
code_inp = ObjectProperty()
rv = ObjectProperty()
def __init__(self, **kwargs):
super(MyLayout, self).__init__(**kwargs)
class MyTextInput(TextInput):
code_inp = ObjectProperty()
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
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_data = []
for i in matches:
display_data.append({'text': i})
#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 RV(DropDown):
def __init__(self, **kwargs):
super(RV, self).__init__(**kwargs)
notes = ['Features', 'Suggestions', 'Abreviations', 'Miscellaneous']
for note in notes:
btn = Button(text='%r' % note, size_hint_y=None, height=30)
btn.bind(on_release=lambda btn: self.select(btn.text))
self.add_widget(btn)
mainbutton = MyTextInput()
mainbutton.bind(on_text=self.open)
self.bind(on_select=lambda instance, x: setattr(mainbutton, 'text', x))
class ListcreationApp(App):
def build(self):
return ListcreationWindow()
if __name__=='__main__':
ListcreationApp().run()
这是我的.kv文件，它是用来创建用户界面的，RV小部件是在这里创建的。
<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
<MyTextInput>:
readonly: False
multiline: False
<RV>:
bar_width: 1
bar_color: 1, 0, 0, 1 # red
bar_inactive_color: 0, 0, 1, 1 # blue
viewclass: 'SelectableLabel'
SelectableRecycleBoxLayout:
default_size: dp(50), dp(30)
default_size_hint: 1, None
size_hint_y: None
height: self.minimum_height
orientation: 'vertical'
multiselect: False
touch_multiselect: True
<FlatButton@ButtonBehavior+Label>:
font_size: 14
<ListcreationWindow>:
id:main_win
orientation:'vertical'
pos: self.pos
size: self.size
canvas.before:
Color:
rgba:(1,1,1,1)
Rectangle:
size:self.size
pos:self.pos
BoxLayout:
id:header
size_hint_y:None
canvas.before:
Color:
rgba:(.06, .45, .45, 1)
Rectangle:
size:self.size
pos:self.pos
Label:
text: "Nadeem POS system"
size_hint_x: .9
bold: True
color:(1,1,1,1)
FlatButton:
id:loggedin_user
text:'nadeem'
color:(1,1,1,1)
BoxLayout:
id:current
size_hint_y:None
height:50
canvas.before:
Color:
rgba:(.06, .45, .45, 1)
Rectangle:
size:self.size
pos:self.pos
Button:
text:'Current Item'
background_normal:''
background_color:(.06, .32 , .32, 1)
size_hint_x: .4
Button:
id:cur_product
text:'Default Product'
background_normal:''
background_color:(.06, .4 , .4, 1)
Button:
id:cur_price
text:'0.00'
background_normal:''
background_color:(.06, .65 , .65, 1)
size_hint_x: .2
BoxLayout:
padding:10
BoxLayout:
id: product_details
orientation: "vertical"
size_hint_x: .8
spacing:10
BoxLayout:
id:product_labels
size_hint_y:None
height:40
canvas.before:
Color:
rgba:(.06,.45,.45, 1)
Rectangle:
size:self.size
pos:self.pos
FlatButton:
text:'Qty'
size_hint_x: .1
FlatButton:
text:'Product Code'
size_hint_x: .3
FlatButton:
text:'Product Name'
size_hint_x: .2
FlatButton:
text:'Price'
size_hint_x: .1
BoxLayout:
id:product_inputs
size_hint_y:None
height: 30
spacing:5
TextInput:
id:qty_inp
size_hint_x:.1
MyLayout:
orientation: 'vertical'
spacing: 2
code_inp: code_inp
MyTextInput:
id: code_inp
size_hint_x:1
multiline:False
size_hint_y:1
on_text_validate:root.update_purchases()
RV:
id:rv
size_hint_x:1
TextInput:
id:disc_inp
size_hint_x:.2
TextInput:
id:price_inp
size_hint_x:.1
BoxLayout:
id:add_to_cart
orientation:"vertical"
BoxLayout:
size_hint_y:None
height:30
canvas.before:
Color:
rgba:(.06,.45,.45,1)
Rectangle:
size:self.size
pos:self.pos
Label:
text:'Code'
size_hint_x:.2
Label:
text:'Product name'
size_hint_x:.3
Label:
text:'Qty'
size_hint_x:.1
Label:
text:'Price'
size_hint_x:.1
GridLayout:
id: products
cols: 1
BoxLayout:
id:preview
orientation:'vertical'
size_hint_x:.2
TextInput:
id:receipt_preview
readonly:True
text:"\t\t\t\tThe Collector\n\t\t\t\t123 Main St\n\t\t\t\tKnowhere, Space\n \n\t\t\t\tTel:(555)-123-456\n\t\t\t\tReceipt No:\n\t\t\t\t Gate:\n\n"
Button:
id:button_pro
text:'Process'
size:75,40
size_hint: None,None
BoxLayout:
id:footer
size_hint_y:None
height:30
canvas.before:
Color:
rgba:(.06,.47,.47,1)
Rectangle:
pos:self.pos
size:self.size
Label:
text:'maintained by nadeem'
这里是一个黑客版的 DropDown 可以让你指定是否要使用 DropDown 始终低于 Widget 它所连接的。
class CustomDropDown(DropDown):
force_below = BooleanProperty(False) # if True, DropDown will be positioned below attached to Widget
def __init__(self, **kwargs):
super(CustomDropDown, self).__init__(**kwargs)
self.do_not_reposition = False # flag used to avoid repositioning recursion
def _reposition(self, *largs):
if self.do_not_reposition:
return
super(CustomDropDown, self)._reposition(*largs)
if self.force_below:
self.make_drop_below()
def make_drop_below(self):
self.do_not_reposition = True # avoids recursion triggered by the changes below
if self.attach_to is not None:
wx, wy = self.to_window(*self.attach_to.pos)
self.height = wy # height of DropDown will fill window below attached to Widget
self.top = wy # top of DropDown will be at bottom of attached to Widget
self.do_not_reposition = False # now turn auto repositioning back on
要使用它，你可以直接调用 CustomDropDown(force_below=True). 当然，如果下面的空间附加到了...。Widget 到底部 Window 太小，这将无法使用。一个更通用的方法是允许指定下面、上面或正常的定位选择。
这可以用在您的 MyTextInput 类。
class MyTextInput(TextInput):
code_inp = ObjectProperty()
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)
self.dropdown = CustomDropDown(force_below=True)
notes = ['Features', 'Suggestions', 'Abreviations', 'Miscellaneous']
for note in notes:
# when adding widgets, we need to specify the height manually (disabling
# the size_hint_y) so the dropdown can calculate the area it needs.
btn = Button(text='%r' % note, size_hint_y=None, height=30)
# for each button, attach a callback that will call the select() method
# on the dropdown. We'll pass the text of the button as the data of the
# selection.
btn.bind(on_release=lambda btn: self.dropdown.select(btn.text))
# then add the button inside the dropdown
self.dropdown.add_widget(btn)
# one last thing, listen for the selection in the dropdown list and
# assign the data to the button text.
self.dropdown.bind(on_select=lambda instance, x: setattr(self, 'text', x))
def on_text(self, instance, value):
# only open DropDown if it is not already open and this TextInput is displayed
if self.dropdown.parent is None and self.get_parent_window() is not None:
self.dropdown.open(self)
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)
还需要注释出 RV 在 operator.kv:
MyLayout:
orientation: 'vertical'
spacing: 2
code_inp: code_inp
MyTextInput:
id: code_inp
size_hint_x:1
multiline:False
size_hint_y:1
on_text_validate:root.update_purchases()
# RV:
# id:rv
# size_hint_x:1
这基本上只是一个概念的证明。显然，还需要更多的逻辑。