如何在流程完成之前显示“请稍候 gif”图像
Posted
技术标签:
【中文标题】如何在流程完成之前显示“请稍候 gif”图像【英文标题】：how can I show "please wait gif" image before the process is complete 【发布时间】：2021-03-25 20:43:00 【问题描述】：我想在 ListApp() 类进程完成之前显示来自 img() 类的“请等待 gif”图像，然后一旦该类的进程完成，应该显示 ListApp 的屏幕。
我正在尝试以下代码，但它没有启动 ListApp() 类的进程
run1.py 文件
from kivy.lang import Builder
from kivy.app import App
from kivy.uix.widget import Widget
from kivy.properties import ObjectProperty
from Option import OptionApp
import sys, time, threading
from kivy.uix.screenmanager import ScreenManager, Screen
from datetime import datetime
import pandas_datareader.data as web
import pandas as pd
from kivymd.uix.screen import Screen
from kivymd.uix.list import MDList,ThreeLineListItem,ThreeLineAvatarIconListItem
from kivymd.uix.list import IconLeftWidget,ImageLeftWidget
from kivy.uix.scrollview import ScrollView
from kivy.uix.button import Button
from kivymd.app import MDApp
from kivy.app import App
from kivy.properties import ObjectProperty
import csv
from os import path
from kivy.uix.image import Image
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
kv = Builder.load_file("run1.kv")
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.root.ids.txt_input1.text = str(rv.data[index].get("text"))
App.get_running_app().root.widget_1.ids.txt_input1.text = str(rv.data[index].get("text"))
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(Screen):
def __init__(self, **kwargs):
super(Body, self).__init__(**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))
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)
class signin(Screen):
user_name = ObjectProperty(None)
def btn(self):
username = self.user_name.text
print(username)
sm.current = 'option_screen'
class option(Screen):
def btn_addstock(self):
sm.current = 'body_screen'
def btn_stoplosslist(self):
sm.canvas.clear()
sm.current = 'Stoploss_ip'
class stockinput(Screen):
stock_name = ObjectProperty(None)
stock_symbol = ObjectProperty(None)
purchase_price = ObjectProperty(None)
stop_loss = ObjectProperty(None)
def btn(self):
end = datetime.today().date()
start = end.year - 10
start = datetime(start, datetime.today().month, datetime.today().day).date()
uname = input("Enter user name: ")
print("Stock Name:", self.stock_name.text, "Stock Symbol:", self.stock_symbol.text)
print("Purchase Price:",self.purchase_price.text,"Stop Loss(%):",self.stop_loss.text)
#write data to csv file
# if path.exists("stoploss.csv"):
# myFile = open('stoploss.csv', 'a')
# else:
# myFile = open('stoploss.csv', 'w')
file_name = stockinput.uname + "_stoploss.csv"
if path.exists(file_name):
with open(file_name, "a+", newline='')as newFile :
fieldnames = ["Stock Name", "Stock Symbol", "Purchase Price", "Stop Loss(%)"]
newFileWriter = csv.DictWriter(newFile, fieldnames=fieldnames)
newFileWriter.writerow("Stock Name" : self.stock_name.text,"Stock Symbol" : self.stock_symbol.text,"Purchase Price" : self.purchase_price.text,"Stop Loss(%)" : self.stop_loss.text)
else:
myFile = open(file_name, 'w+')
myData = [["Stock Name", "Stock Symbol", "Purchase Price", "Stop Loss(%)"],[self.stock_name.text, self.stock_symbol.text, self.purchase_price.text, self.stop_loss.text]]
with myFile:
writer = csv.writer(myFile)
writer.writerows(myData)
df = web.DataReader(self.stock_symbol.text, 'yahoo', start, end,)
print(df.tail())
self.stock_name.text = ""
self.stock_symbol.text = ""
self.purchase_price.text = ""
self.stop_loss.text = ""
f = pd.read_csv("stoploss.csv")
file = pd.DataFrame(f, columns=['Stock Symbol','Purchase Price','Stock Name','Stop Loss(%)'])
class img(Screen):
def build(self,**kwargs):
super(img, self).__init__(**kwargs)
screen = self
image = Image(source='please_wait.gif')
screen.add_widget(image)
class ListApp(Screen):
# def imgpr(self,**kwargs):
# super(ListApp, self).__init__(**kwargs)
#
# time.sleep(0.1)
# t = threading.Thread(target=imgpr)
# t.start()
def build(self,**kwargs):
super(ListApp, self).__init__(**kwargs)
flag = True
screen = self
# if flag:
#
#
# sm.add_widget(ListApp(name='Stoploss_ip'))
end = datetime(2020, 12, 14)
start = datetime(2020, 12, 14)
btn = Button(text="Back",
font_size="20sp",
background_color=(255/255, 229/255, 204/255, 1),
color=(1, 1, 1, 1),
size=(12, 12),
size_hint=(.1, .05),
pos=(600, 500))
btn.bind(on_press=lambda *args: setattr(sm, 'current', "option_screen"))
scroll = ScrollView()
list_view = MDList()
scroll.add_widget(list_view)
i = 0
fl = len(file.index)
try:
for index in range(fl):
for index in range(1):
columnSeriesObj2 = file.iloc[:, 0]
df = web.DataReader(columnSeriesObj2.values[i],'yahoo', start, end,retry_count=3)
print(df.head())
Objname = file.iloc[:, 2]
columnSeriesObj = df.iloc[:, 3]
columnSeriesObj1 = file.iloc[:, 1]
ObjStoploss = file.iloc[:, 3]
cp = iter(columnSeriesObj.values)
pp = iter(columnSeriesObj1.values)
pp1 = next(pp)
cp1 = columnSeriesObj.values[0]
sl = columnSeriesObj1.values[i] - (columnSeriesObj1.values[i] * (ObjStoploss.values[i]/100))
if cp1 <= sl:
image = ImageLeftWidget(source='loss.png')
items = ThreeLineAvatarIconListItem(text="Alert sale " + Objname.values[i], secondary_text='Close price: '+str(cp1),
tertiary_text='Stoploss: ' + str(sl))
items.add_widget(image)
list_view.add_widget(items)
i=i+1
else:
image = ImageLeftWidget(source='profit.jpg')
items = ThreeLineAvatarIconListItem(text="Chill " + Objname.values[i],
secondary_text='Close price: ' + str(cp1),
tertiary_text='Stoploss: ' + str(sl))
items.add_widget(image)
list_view.add_widget(items)
i=i+1
except ConnectionAbortedError:
print("Check your Internet connection")
except ConnectionRefusedError:
print("Check your Internet connection")
except ConnectionError:
print("Check your Internet connection")
except ConnectionResetError:
print("Check your Internet connection")
except TimeoutError:
print("Timeout!!!!...Check your Internet connection")
except KeyError:
pass
except:
print("Something went wrong")
print("Done")
# flag = False
# if flag ==False:
screen.add_widget(scroll)
screen.add_widget(btn)
# return screen
class WindowsManager(ScreenManager):
pass
sm = ScreenManager()
sm.add_widget(signin(name='signin_screen'))
sm.add_widget(option(name='option_screen'))
sm.add_widget(stockinput(name='stockinput_screen'))
sm.add_widget(img(name='image_screen'))
sm.add_widget(ListApp(name='Stoploss_ip'))
sm.add_widget(Body(name='body_screen'))
class run1(MDApp):
def build(self):
return sm
if __name__ == "__main__":
run1().run()
run1.kv 文件
<WindowsManager>:
signin:
option:
stockinput:
ListApp:
Body:
<Body>:
name: 'body_screen'
canvas.before:
Color:
rgba: 188/255, 143/255, 145/255, 1
Rectangle:
pos: self.pos
size: self.size
<DropDownWidget>:
id: 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>:
id: MyTextInput
readonly: False
multiline: False
<SelectableLabel>:
id: 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
<signin>:
canvas.before:
Color:
rgba: 164/255, 66/255, 220/255, 1
Rectangle:
pos: self.pos
size: self.size
name: 'signin_screen'
user_name: user_name
GridLayout:
pos_hint: 'center_x': .75, 'center_y': .15
row_force_default : True
row_default_height : 50
col_force_default : True
col_default_width : 400
spacing: '15dp'
cols: 1
TextInput:
id: user_name
multiline:False
size_hint: 5.0 ,.1
hint_text: "Email_ID"
Button:
text:"Submit"
font_size: 20
color:0,0,0,1
size_hint: .5 ,.3
background_normal: ''
background_color: (255/255, 153/255, 71/255, 1)
on_press : root.btn()
Label:
text:"Please Do not change the Email_ID. Data will be saved as per your Email_ID"
pos: 180,80
<option>:
canvas.before:
Color:
rgba: 138/255, 104/255, 175/255, 1
Rectangle:
pos: self.pos
size: self.size
name: 'option_screen'
GridLayout:
pos_hint: 'center_x': .83, 'center_y': .18
row_force_default : True
row_default_height : 100
col_force_default : True
col_default_width : 250
spacing: '20dp'
cols:1
Button:
text:"Add Stock"
color:0,0,0,1
font_size: 18
size_hint: .1 ,.1
pos: 150,150
background_normal: ''
background_color: (204/255, 0, 204/255, 1)
on_press : root.manager.current = 'body_screen'
Button:
text:"Check Stoploss"
color:0,0,0,1
font_size: 18
size_hint: .1 ,.1
pos: 250,120
background_normal: ''
background_color:(127/255, 193/255, 184/255, 1)
on_press : root.manager.current = 'Stoploss_ip'
<stockinput>:
canvas.before:
Color:
rgba: 188/255, 143/255, 145/255, 1
Rectangle:
pos: self.pos
size: self.size
name: 'stockinput_screen'
stock_name: stock_name
stock_symbol: stock_symbol
purchase_price: purchase_price
stop_loss: stop_loss
GridLayout:
pos_hint: 'center_x': .67, 'center_y': .2
row_force_default : True
row_default_height : 40
col_force_default : True
col_default_width : 250
spacing: '10dp'
cols:2
# pos_hint: 'center_x': .53, 'center_y': .12
# row_force_default : True
# row_default_height : 30
# col_force_default : True
# col_default_width : 250
# spacing: '20dp'
Label:
text: "Stock Name: "
TextInput:
id: stock_name
multiline:False
Label:
text: "Stock Symbol: "
TextInput:
id: stock_symbol
multiline:False
Label:
text: "Purchase Price: "
TextInput:
id: purchase_price
multiline:False
Label:
text: "Stop Loss(%): "
TextInput:
id: stop_loss
multiline:False
Button:
text:"Submit"
color:102/255, 204/255, 0, 1
font_size:18
background_color: (204/255, 0, 102/255, 1)
on_press: root.btn()
Button:
text:"Back"
color:0,0,0,1
font_size:18
background_normal: ''
background_color: (204/255, 102/255, 0, 1)
on_press: root.manager.current = 'option_screen'
<img>:
name: 'image_screen'
on_enter:root.build()
<ListApp>:
name: 'Stoploss_ip'
on_enter:root.build()
**更新 我尝试在 build() 方法中添加 2 行并现在显示图像。我认为它会预加载图像并将它们保存在缓存中。
class ListApp(Screen):
def build(self):
self.popup = Popup(title='Calculating Stoploss', content=Image(source='please_wait.gif'))
self.profit = ImageLeftWidget(source='profit.jpg')
self.loss = ImageLeftWidget(source='loss.png')
self.popup.open()
# Clock.schedule_once(partial(self.actual_build))
threading.Thread(target=self.actual_build).start()
def actual_build(self):
screen = self
end = datetime.today().date()
start = end
btn = Button(text="Back",
font_size="20sp",
background_color=(255/255, 229/255, 204/255, 1),
color=(1, 1, 1, 1),
size=(12, 12),
size_hint=(.1, .05),
pos=(600, 500))
btn.bind(on_press=lambda *args: setattr(sm, 'current', "option_screen"))
scroll = ScrollView()
list_view = MDList()
scroll.add_widget(list_view)
i = 0
fl = len(file.index)
try:
for index in range(fl):
for index in range(1):
columnSeriesObj2 = file.iloc[:, 0]
df = web.DataReader(columnSeriesObj2.values[i],'yahoo', start, end,retry_count=3)
print(df.head())
Objname = file.iloc[:, 2]
columnSeriesObj = df.iloc[:, 3]
columnSeriesObj1 = file.iloc[:, 1]
ObjStoploss = file.iloc[:, 3]
cp = iter(columnSeriesObj.values)
pp = iter(columnSeriesObj1.values)
pp1 = next(pp)
cp1 = columnSeriesObj.values[0]
sl = columnSeriesObj1.values[i] - (columnSeriesObj1.values[i] * (ObjStoploss.values[i]/100))
if cp1 <= sl:
image = ImageLeftWidget(source='loss.png')
items = ThreeLineAvatarIconListItem(text="Alert sale " + Objname.values[i], secondary_text='Close price: '+str(cp1),
tertiary_text='Stoploss: ' + str(sl))
items.add_widget(image)
list_view.add_widget(items)
i=i+1
else:
image = ImageLeftWidget(source='profit.jpg')
items = ThreeLineAvatarIconListItem(text="Chill " + Objname.values[i],
secondary_text='Close price: ' + str(cp1),
tertiary_text='Stoploss: ' + str(sl))
items.add_widget(image)
list_view.add_widget(items)
i=i+1
except ConnectionAbortedError:
print("Check your Internet connection")
except ConnectionRefusedError:
print("Check your Internet connection")
except ConnectionError:
print("Check your Internet connection")
except ConnectionResetError:
print("Check your Internet connection")
except TimeoutError:
print("Timeout!!!!...Check your Internet connection")
except KeyError:
pass
except:
pass
# print("Something went wrong")
print("Done")
# screen.add_widget(screen.scroll)
# screen.add_widget(btn)
Clock.schedule_once(partial(screen.finish_build, scroll, btn))
screen.popup.dismiss()
def finish_build(self, scroll, btn, dt):
screen = self
screen.add_widget(scroll)
screen.add_widget(btn)
【问题讨论】：
【参考方案1】：由于您使用on_enter 属性触发build() 方法，因此您可以使用该方法完成您想要的操作。
首先，您正在调用：
super(ListApp, self).__init__(**kwargs)
来自build() 方法。除非在 __init__() 方法覆盖中，否则不应调用该 super 方法。所以应该删除该行。由于您还没有为ListApp编写__init__()方法，因此无需调用超类__init__()。
我建议将您的 build() 方法重命名为 actual_build()，如下所示：
def actual_build(self, *args):
并定义一个新的build() 方法为：
def build(self, **kwargs):
self.popup = Popup(title='Preparing ListApp', content=Image(source='please_wait.gif', anim_delay=0.05))
self.popup.open()
threading.Thread(target=self.actual_build).start()
上述方法显示动画gif，并启动actual_build()方法（原名build()）。
然后，修改actual_build()方法为：
def actual_build(self, *args):
# super(ListApp, self).__init__(**kwargs)
flag = True
screen = self
# if flag:
#
#
# sm.add_widget(ListApp(name='Stoploss_ip'))
end = datetime(2020, 12, 14)
start = datetime(2020, 12, 14)
btn = Button(text="Back",
font_size="20sp",
background_color=(255/255, 229/255, 204/255, 1),
color=(1, 1, 1, 1),
size=(12, 12),
size_hint=(.1, .05),
pos=(600, 500))
btn.bind(on_press=lambda *args: setattr(sm, 'current', "option_screen"))
scroll = ScrollView()
list_view = MDList()
scroll.add_widget(list_view)
i = 0
fl = len(file.index)
try:
for index in range(fl):
for index in range(1):
columnSeriesObj2 = file.iloc[:, 0]
df = web.DataReader(columnSeriesObj2.values[i],'yahoo', start, end,retry_count=3)
print(df.head())
Objname = file.iloc[:, 2]
columnSeriesObj = df.iloc[:, 3]
columnSeriesObj1 = file.iloc[:, 1]
ObjStoploss = file.iloc[:, 3]
cp = iter(columnSeriesObj.values)
pp = iter(columnSeriesObj1.values)
pp1 = next(pp)
cp1 = columnSeriesObj.values[0]
sl = columnSeriesObj1.values[i] - (columnSeriesObj1.values[i] * (ObjStoploss.values[i]/100))
if cp1 <= sl:
image = ImageLeftWidget(source='loss.png')
items = ThreeLineAvatarIconListItem(text="Alert sale " + Objname.values[i], secondary_text='Close price: '+str(cp1),
tertiary_text='Stoploss: ' + str(sl))
items.add_widget(image)
list_view.add_widget(items)
i=i+1
else:
image = ImageLeftWidget(source='profit.jpg')
items = ThreeLineAvatarIconListItem(text="Chill " + Objname.values[i],
secondary_text='Close price: ' + str(cp1),
tertiary_text='Stoploss: ' + str(sl))
items.add_widget(image)
list_view.add_widget(items)
i=i+1
except ConnectionAbortedError:
print("Check your Internet connection")
except ConnectionRefusedError:
print("Check your Internet connection")
except ConnectionError:
print("Check your Internet connection")
except ConnectionResetError:
print("Check your Internet connection")
except TimeoutError:
print("Timeout!!!!...Check your Internet connection")
except KeyError:
pass
except:
print("Something went wrong")
# flag = False
# if flag ==False:
# screen.add_widget(scroll)
# screen.add_widget(btn)
# schedule the code that must be run on the main thread
Clock.schedule_once(partial(self.finish_build, scroll, btn))
# dismiss the animated gif
self.popup.dismiss()
上面的actual_build() 方法完成了原始build() 方法所做的所有事情，除了对GUI 的实际更改（必须在主线程上完成）。在此方法结束时，会安排对finish_build() 的调用，并关闭动画 gif Popup。
最后，添加一个 finish_build() 方法来进行实际的 GUI 更改：
def finish_build(self, scroll, btn, dt):
screen = self
screen.add_widget(scroll)
screen.add_widget(btn)
【讨论】：
谢谢您，先生。但是按照您的建议更改代码后，我在 listview 中使用的图像作为“loss.jpg”和“profit.png”之类的图标未显示。它们只是全黑的图像。可能是什么问题？。 在开发我的答案时，我无法运行您的整个代码。您可能需要重组这些方法，只在actual_build() 方法中进行文件处理，并将所有小部件创建放在finish_build() 方法中。如果你在主线程上做太多的处理，你的动画 gif 将不会被动画化。
好的..我明白了..谢谢先生
我也试过了。但是正如您可以看到我的代码.. 当 if 语句为真而 for 循环正在迭代时，图像被添加到 ImageLeftWidget 中。它是actual_build() 的主要部分。那么如何在finish_build()中添加它
我尝试在构建方法中将代码“threading.Thread(target=self.actual_build).start()”更改为 Clock.schedule_once(partial(self.actual_build))。现在它正在显示这些图像。但问题是 gif 动画没有播放。它看起来只是一个图像。我不知道是冻结还是不玩动漫。我该怎么办？【参考方案2】：
现在我可以实际运行您的代码，我有一个更新的答案。首先，ListApp的部分画面可以在kv文件中构造为：
<ListApp>:
name: 'Stoploss_ip'
on_enter:root.build()
ScrollView:
MDList:
id: list_view
Button:
text: "Back"
font_size: "20sp"
background_color: (255/255, 229/255, 204/255, 1)
color: (1, 1, 1, 1)
size: (12, 12)
size_hint: (.1, .05)
pos: (600, 500)
on_press: root.manager.current = "option_screen"
那么ListApp类可以是：
class ListApp(Screen):
built = BooleanProperty(False)
def build(self):
if self.built:
return
self.built = True
self.popup = Popup(title='Calculating Stoploss', content=Image(source='please_wait.gif'))
self.popup.open()
threading.Thread(target=self.actual_build).start()
def actual_build(self):
end = datetime.today().date()
start = end
i = 0
fl = len(file.index)
try:
for index in range(fl):
for index in range(1):
columnSeriesObj2 = file.iloc[:, 0]
df = web.DataReader(columnSeriesObj2.values[i],'yahoo', start, end,retry_count=3)
print(df.head())
Objname = file.iloc[:, 2]
columnSeriesObj = df.iloc[:, 3]
columnSeriesObj1 = file.iloc[:, 1]
ObjStoploss = file.iloc[:, 3]
cp = iter(columnSeriesObj.values)
pp = iter(columnSeriesObj1.values)
pp1 = next(pp)
cp1 = columnSeriesObj.values[0]
sl = columnSeriesObj1.values[i] - (columnSeriesObj1.values[i] * (ObjStoploss.values[i]/100))
if cp1 <= sl:
Clock.schedule_once(partial(self.add_loss, Objname.values[i], str(cp1), str(sl)))
i=i+1
else:
Clock.schedule_once(partial(self.add_profit, Objname.values[i], str(cp1), str(sl)))
i=i+1
except ConnectionAbortedError:
print("Check your Internet connection")
except ConnectionRefusedError:
print("Check your Internet connection")
except ConnectionError:
print("Check your Internet connection")
except ConnectionResetError:
print("Check your Internet connection")
except TimeoutError:
print("Timeout!!!!...Check your Internet connection")
except KeyError:
pass
except:
pass
# print("Something went wrong")
print("Done")
self.popup.dismiss()
def add_loss(self, name, close_price, stop_loss, dt):
image = ImageLeftWidget(source='loss.png')
items = ThreeLineAvatarIconListItem(text="Alert sale " + name, secondary_text='Close price: '+close_price,
tertiary_text='Stoploss: ' + stop_loss)
items.add_widget(image)
self.ids.list_view.add_widget(items)
def add_profit(self, name, close_price, stop_loss, dt):
image = ImageLeftWidget(source='profit.jpg')
items = ThreeLineAvatarIconListItem(text="Chill " + name,
secondary_text='Close price: ' + close_price,
tertiary_text='Stoploss: ' + stop_loss)
items.add_widget(image)
self.ids.list_view.add_widget(items)
改变的主要项目是列表和后退按钮内置在'kv'中，列表的项目使用Clock.schedule_once()构建。不再需要finish_build() 方法。
另外，请注意我添加了一个built 属性来跟踪屏幕是否已构建，因此屏幕不会被构建多次。如果它被多次构建，列表中的项目将被重复添加。
【讨论】：
@Jahn Anderson。非常感谢 关于recycleview的新问题here 先生，您检查我的新问题了吗？ here 请检查问题先生 您添加了一个内置属性，用于跟踪屏幕是否已构建。但是我想在那里放置一个刷新按钮，那么如何在不重复项目的情况下重新加载相同的进程。以上是关于如何在流程完成之前显示“请稍候 gif”图像的主要内容，如果未能解决你的问题，请参考以下文章
如何延迟 onClick 图像链接，以便 .gif 动画可以在页面切换之前完成？