Python/Kivy : Call function from one class to another class and show widget in Python(Python/Kivy:从一个类调用函数到另一个类并在 Python 中显示小部件)

问题描述

我正在使用 Python-2.7 和 Kivy.当我运行 test.py 时，会显示一个显示按钮.当我单击显示按钮时，会显示一个标签和值.我正在从数据库中获取它，但现在我将它定义为一个静态数组.

I am using Python-2.7 and Kivy. When I run test.py then a show button shows. When I click on the show button then a label and value shows. I am fetching it from the database but now I defined it as a static array.

当我点击 Item1 标签然后调用 def open_form 并在使用 id 调用 EditPopup(self) 后传递 id 11 并显示一个带有值的弹出窗口.

When I click on Item1 label then call def open_form and pass id 11 after calling EditPopup(self) with id and show a popup with value.

之后我更改 itemCode 并单击确定按钮，然后它会更新数据库中的数据.

After that I change itemCode and click on the ok button then it updates data in the database.

之后我调用 Invoice().abc() 然后它在 Pycharm 控制台中打印更新的数据，但不显示 layout.add_widget 中的最新数据(弹出窗口).

After that I call Invoice().abc() then it prints the updated data in Pycharm console but not showing latest the data in layout.add_widget(Popup window).

谁能告诉我哪里出错了?

Can someone tell me where am I making a mistake?

from kivy.uix.label import Label
from kivy.uix.screenmanager import Screen
from kivy.app import App
from kivy.core.window import Window
from functools import partial
from kivy.uix.popup import Popup
from kivy.properties import BooleanProperty, ListProperty, StringProperty, ObjectProperty, NumericProperty
import sqlite3 as lite
#con = lite.connect('test.db')

#con.text_factory = str
#cur = con.cursor()
Window.clearcolor = (0.5, 0.5, 0.5, 1)
Window.size = (600, 600)

class MyLabel(Label):
    pass


class EditPopup(Popup):
    mode = StringProperty("")
    label_rec_id = StringProperty("Id")
    col_data = ListProperty(["?", "?", "?"])
    index = NumericProperty(0)

    def __init__(self, obj, **kwargs):
        super(EditPopup, self).__init__(**kwargs)

        if obj.mode == "Update":
            #cur.execute("SELECT * FROM `item` WHERE itemId=?", (edit_id,))
            #row = cur.fetchone()
            row = (11, 'Item1', '1001')
            print(row[0])
            self.col_data[0] = str(row[0])
            self.col_data[1] = row[1]
            self.col_data[2] = row[2]

    def update(self,obj):
        #cur.execute("UPDATE `item` SET itemName=?, itemCode=? WHERE itemId=?",
                #('Item1', 9999, 11))
        #con.commit()
        Invoice().abc()

class Invoice(Screen):
    def __init__(self, **kwargs):
        super(Invoice, self).__init__(**kwargs)

    def abc(self):
        #fetching from database
        #cur.execute("SELECT * FROM `item` order by itemId asc")
        #rows = cur.fetchall()
        rows = [(11, 'Item1', '1001'), (12, 'Item2', '2001'), (13, 'Item3', '102')]
        print(rows)
        layout = self.ids['invoices']
        for row in rows:
            layout.add_widget(MyLabel(text=str('[ref=world]' + row[1]) + '[/ref]',
                                      size_hint_x=.35,
                                      halign='left',
                                      markup=True,
                                      on_ref_press=partial(self.open_form, row[0])))

    def open_form(self, id, *args):
        global edit_id
        edit_id = id
        self.mode = "Update"
        popup = EditPopup(self)
        popup.open()

class Test(App):

    def build(self):
        return Invoice()

if __name__ == '__main__':
    Test().run()

test.kv

<Button@Button>:
    font_size: 15
    font_name: 'Verdana'
    size_hint_y:None
    height: 30

<MyLabel>:
    font_size: 15
    font_name: 'Verdana'
    size_hint_y:None
    height: 30
    text_size: self.size
    valign: 'middle'
    canvas.before:
        Color:
            rgb: .6, .6, .6
        Rectangle:
            pos: self.pos
            size: self.size

<EditPopup>:
    title: self.mode + " Item"
    size_hint: None, None
    title_size: 20
    title_font: "Verdana"
    size: 400, 275
    auto_dismiss: False

    BoxLayout:
        orientation: "vertical"
        GridLayout:
            cols: 2
            #backgroun_color: 0, 0.517, 0.705, 1
            spacing: 10, 10
            padding: 20, 20
            Label:
                text: root.label_rec_id
                text_size: self.size
            Label:
                id: itemId
                text: root.col_data[0]
                text_size: self.size
            Label:
                text: "Item Name"
                text_size: self.size
                valign: 'middle'
            TextInput:
                id: itemName
                text: root.col_data[1]
                text_size: self.size
            Label:
                text: "State Code"
                text_size: self.size
                valign: 'middle'
            TextInput:
                id: itemCode
                text: root.col_data[2]
                text_size: self.size

        GridLayout:
            cols: 2
            padding: 10, 0, 10, 10
            spacing: 10, 10
            row_default_height: '20dp'
            size_hint: .55, .3
            pos_hint: {'x': .25, 'y':.65}

            Button:
                size_hint_x: .5
                text: "Ok"
                on_release:
                    root.update(root)
                    root.dismiss()

            Button:
                size_hint_x: .5
                text: "Cancel"
                on_release: root.dismiss()



<Invoice>:
    BoxLayout:
        orientation: "vertical"
        padding : 15, 15

        BoxLayout:
            orientation: "vertical"
            padding : 5, 5
            size_hint: .6, None
            pos_hint: {'x': .18,}


            BoxLayout:
                orientation: "horizontal"
                padding : 5, 5
                spacing: 10, 10
                size: 800, 40
                size_hint: 1, None

                Button:
                    text: "Show"
                    size_hint_x: .05
                    spacing_x: 30
                    on_press:root.abc()

        BoxLayout:
            orientation: "horizontal"
            size_hint: 1, 1

            BoxLayout:
                orientation: "vertical"
                size_hint: .5, 1
                padding : 0, 15
                spacing: 10, 10
                size: 500, 30

                GridLayout:
                    id: invoices
                    cols: 2
                    #orientation: "horizontal"
                    padding : 5, 0
                    spacing: 10, 0
                    #size: 500, 30
                    size_hint: 1, 1
                    pos: self.pos
                    size: self.size

推荐答案

您正在创建一个新的 Invoice 实例，而不是使用现有的实例.

You are creating a new Invoice instance instead of using the existing one.

 Invoice().abc()

试试吧:

class EditPopup(Popup):
    mode = StringProperty("")
    label_rec_id = StringProperty("Id")
    col_data = ListProperty(["?", "?", "?"])
    index = NumericProperty(0)

    def __init__(self, obj, **kwargs):
        super(EditPopup, self).__init__(**kwargs)
        self.obj = obj # will need it later...

    def update(self,obj):
        #cur.execute("UPDATE `item` SET itemName=?, itemCode=? WHERE itemId=?",
                #('Item1', 9999, 11))
        #con.commit()

        self.obj.abc()  # was Invoice().abc()

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