[解決済み] 処理が完了する前に「please wait gif」画像を表示するには？

質問

ListApp()クラスの処理が完了する前にimg()クラスから"please wait gif"の画像を表示し、そのクラスの処理が完了次第、ListAppの画面を表示したいのですが、可能でしょうか？

以下のコードを試しましたが、ListApp()クラスの処理が開始されません。

run1.pyファイル

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ファイル

<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 build()メソッドに2行追加してみたところ、画像が表示されるようになりました。画像をプリロードして、キャッシュに保存しているのだと思います。

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)

解決方法は？

をトリガーしているので build() メソッドを使用することで on_enter 属性を使用すれば、その方法で望みのものを実現することができます。

まず、電話をかけていますね。

super(ListApp, self).__init__(**kwargs)

から build() メソッドを使用します。その super メソッドの中からでなければ __init__() メソッドをオーバーライドします。ですから、その行は削除されるべきです。あなたは __init__() メソッドを ListApp を呼び出す必要はありません。 __init__() .

の名前を変更することをお勧めします。 build() メソッドを actual_build() をこのようにします。

def actual_build(self, *args):

を定義し、新たに build() というメソッドがあります。

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()

上記のメソッドは、アニメーションGIFを表示し、その上で actual_build() メソッド（旧名 build() ).

次に actual_build() というメソッドを使用します。

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()

上記の actual_build() メソッドが行うことは、オリジナルの build() メソッドが行ったことです。ただし、GUIの実際の変更（これはメインスレッドで行う必要があります）は除きます。このメソッドの終わりで finish_build() がスケジュールされ、アニメーションのGIF Popup が解除されます。

最後に finish_build() メソッドは、実際のGUI変更を行います。

def finish_build(self, scroll, btn, dt):
    screen = self
    screen.add_widget(scroll)
    screen.add_widget(btn)