python - 从 kivy 下拉列表中删除所有按钮

问题描述

我是 Python 新手，我试图解决这个问题，但不太可能我无法做到这一点。下拉菜单是通过 mqtt 动态填充的（例如这里是蚊子），在选择了一个值之后，我需要更改 Screen，当我返回带有下拉菜单的屏幕时，它应该是空的。

有人有什么想法吗？先感谢您。

主文件

#-*-coding:utf8;-*-
#qpy:2
#qpy:kivy
#!/usr/bin/python
#@@@@@@ -*- coding: utf-8 -*-

from kivy.app import App
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.dropdown import DropDown
from kivy.uix.button import Button
from kivy.core.window import Window
#from kivy.properties import DictProperty

import xmlrpclib
import calendar
import datetime
from urllib3.util.timeout import current_time
from datetime import date, time, timedelta
import locale
from kivy.uix.togglebutton import ToggleButton

from kivy.properties import ListProperty
from threading import Thread
import paho.mqtt.client as mqtt
import time
from time import sleep
from ConfigParser import SafeConfigParser



class CustomDropDownChip(DropDown):
    def __init__(self, **kwargs):
        super(CustomDropDownChip, self).__init__(**kwargs)
        notes = chip_list
        for note in notes:
            btn = Button(text='%s' % note, size_hint_y=None, height=int(Window.height)/10)
            btn.bind(on_release=lambda btn: self.select('CHIP: ' + btn.text))
            self.add_widget(btn)

class StartScreen(Screen):
    pass

class InsertBox(Screen):
    global chip_list
    chip_list = []
    global chip_list_empty
    chip_list_empty = []
    global connected_flag
    consommables = ListProperty([])

    def buttons_down(self):
        app = App.get_running_app()
        app.chip_value = self.ids.id_chip.text
        app.InsertSelection = 'InsertBoxConfirm'

    def on_connect(self, mqttc, obj, flags, rc):
        if rc==0:
            mqttc.connected_flag=True
            connected_flag = True
            print("connected OK")
        else:
            print("Bad connection Returned code=",rc)
    def on_disconnect(self, mqttc, obj, rc):
        pass

    def on_message(self, mqttc, obj, msg):
        response = str(msg.payload)
        if response not in chip_list:
            sleep(1)
            chip_list.append(response)
        if mqttc.connected_flag == False:
            mqttc.on_disconnect()
    def on_publish(self, mqttc, obj, mid):
        print("mid: "+str(mid))
    def on_subscribe(self, mqttc, obj, mid, granted_qos):
        print("Subscribed: "+str(mid)+" "+str(granted_qos))
    def on_log(self, mqttc, obj, level, string):
        print(string)
    def __init__(self, **kwargs):
        super(InsertBox, self).__init__(**kwargs)
    def stop_mqtt(self):
        mqttc.disconnect()
    def start_mqtt(self):
        self.read_chip()
    def read_chip(self, *args):
        global t
        t = Thread(target=self.read_).start()
    def read_(self):

        mqtt.Client.connected_flag=False#create flag in class
        connected_flag = False

        global mqttc
        mqttc = mqtt.Client(transport="websockets")
        mqttc.on_message = self.on_message
        mqttc.on_connect = self.on_connect
        mqttc.on_publish = self.on_publish
        mqttc.on_subscribe = self.on_subscribe
        mqttc.on_log = self.on_log
        mqttc.connect("test.mosquitto.org", 8080, 60)
        mqttc.subscribe("temp/random", 0)
        mqttc.loop_forever()



    def consume(self, *args):
        while self.consommables and time() < (Clock.get_time() + MAX_TIME):
            item = self.consommables.pop(0)  # i want the first one
            label = Factory.MyLabel(text=item)
            self.root.ids.id_chip.text = label #add_widget(label)

#    @classmethod
    def reset_chip_list(self):
        chip_list = chip_list_empty


class InsertBoxConfirm(Screen):
    def buttons_set(self):
        InsertBox.buttons_set()
    def buttons_reset(self):
        InsertBox.buttons_reset()

class MyScreenManager(ScreenManager):

    def SetChip(self, value):
        pass

class testdropdownApp(App):
    title = "Kivy Drop-Down List Demo"
    chip_list = chip_list_empty
    chip_value = ''

    def build(self):
        return MyScreenManager()

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

testdropdown.kv

#:kivy 1.10.0
#:import Factory kivy.factory.Factory

<CustomDropDownChip>:
    on_select:
        app.root.ids.InsertBox.ids.id_chip.text = '{}'.format(args[1])
        app.root.SetChip(args[1])


<StartScreen>:
    name: 'StartScreen'
    Button:
        text: 'Start'
        on_release:
            root.manager.transition.direction = 'left'
            root.manager.transition.duration = 0
            root.manager.current = 'InsertBox'


<InsertBox>:
    name: 'InsertBox'
    id: test00 
    on_enter:
        root.reset_chip_list()
        root.start_mqtt()
    on_leave:
        root.stop_mqtt()

    GridLayout:
        rows: 2
        id: test01
        GridLayout:
            rows: 1
            size_hint_y: .27
            padding: 5
            Button:
                id: id_chip
                text: 'Select chip'
#                    size_hint_y: .5
                spacing: 5
                on_release: Factory.CustomDropDownChip().open(self)

        GridLayout:
            size_hint_y: .2
            height: .15
            cols: 2
            BoxLayout:
                padding: 5
                orientation: 'horizontal'
                size: root.size
                pos: root.pos
                spacing: 5
#                height: .15
                Button:
                    text: "Back"
                    on_press:
                        root.reset_chip_list()
                        root.manager.transition.direction = 'left'
                        root.manager.transition.duration = 0
                        root.manager.current = 'StartScreen'
                Button:
                    text: 'OK'
                    on_press:
                        root.buttons_down()
                        root.manager.transition.direction = 'left'
                        root.manager.transition.duration = 0
                        root.manager.current = 'InsertBoxConfirm'

<InsertBoxConfirm>:
    name: 'InsertBoxConfirm'
    on_pre_enter:
        id_chip_label.text = app.chip_value
    GridLayout:
        rows: 2
        id: id_InsertBoxConfirm
        GridLayout:
            rows: 1
            size_hint_y: .27
            padding: 5
            Label:
                id: id_chip_label
                text: 'valore CHIP'

        GridLayout:
            size_hint_y: .2
            height: .15
            cols: 1
            BoxLayout:
                padding: 5
                orientation: 'horizontal'
                size: root.size
                pos: root.pos
                spacing: 5
                Button:
                    text: 'OK'
                    id: button_ok
                    on_press:
                        root.manager.transition.direction = 'left'
                        root.manager.transition.duration = 0
                        root.manager.current = 'InsertBox'


<MyScreenManager>:
    StartScreen:
        id: 'StartScreen'
        name: 'StartScreen'
    InsertBox:
        id: InsertBox
        name: 'InsertBox'
    InsertBoxConfirm:
        id: InsertBoxConfirm
        name: 'InsertBoxConfirm'

标签： pythonpython-2.7kivykivy-language

python - 从 kivy 下拉列表中删除所有按钮

问题描述

解决方案

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