Question

我正在尝试使用TabbedPanel类编写程序。我将使用ScreenManager和navbuttons来浏览每个选项卡中的不同屏幕。问题是什么都没有出现。起初至少NavLayout出现了，但现在出现的只是带有各自名称的选项卡。如何在选项卡中显示导航按钮和屏幕。

ex1.kv


<MainPanel>:
    id: mp
    usb_tab_wid: usb_tab
    remote_tab_wid: remote_tab
    sd_tab_wid: sd_tab

    size_hint: 1,1
    tab_width: 65
    do_default_tab: False
    tab_pos: 'top_right'

    TabbedPanelItem:
        id: usb_tab
        text: 'Usb'
        BoxLayout:
            orientation: 'vertical'
            UsbScreenManager:
            NavLayout:


    TabbedPanelItem:
        id: remote_tab
        text: 'Remote'

    TabbedPanelItem:
        id: sd_tab
        text: 'SD'





<NavLayout>:
    id: grid1
    spacing: 5,5

    rows: 1
    size_hint: 1, .2
    LeftButton:
        id: left_arrow_button

        Image:
            source: 'left_arrow_iconb.png'
            center: left_arrow_button.center
            size: grid1.width*.8, grid1.height*.8

    BackButton:
        id: back_button

        Image:
            source: 'back_iconb.png'
            center: back_button.center
            size: grid1.width*.8, grid1.height*.8
    RightButton:
        id: right_arrow_button

        Image:
            source: 'right_arrow_iconb.png'
            center: right_arrow_button.center
            size: grid1.width*.8, grid1.height*.8

usb.kv




<UsbScreenManager>:
    id: usb_screen_manager
    H2HScreen:
        name: 'h2h'
    V9validationScreen:
        name: 'v9'

<H2HScreen>:
    name: 'h2h'
    BoxLayout:
        TestIcon:
            source: 'h2h.png'

<V9validationScreen>:
    name: 'v9'
    BoxLayout:
        Label:
            text: 'V9 tests'

ex1.py

import kivy
kivy.require('1.9.0')
import subprocess
import csv
from datetime import datetime
import usb.core
import usb.util
import threading
import time
from functools import partial

from kivy.app import App
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.gridlayout import GridLayout
from kivy.uix.behaviors import ButtonBehavior
from kivy.uix.button import Button
from kivy.uix.label import Label
from kivy.properties import ObjectProperty, StringProperty, NumericProperty
from kivy.clock import Clock
from kivy.uix.image import Image

from kivy.uix.screenmanager import ScreenManager, Screen, FadeTransition
from kivy.lang import Builder
from kivy.app import App
from kivy.uix.tabbedpanel import TabbedPanel
from kivy.uix.boxlayout import BoxLayout






class MainPanel(TabbedPanel):
    usb_tab_wid = ObjectProperty()
    remote_tab_wid = ObjectProperty()
    sd_tab_wid = ObjectProperty()

    usbman = ObjectProperty(None)

    def switch_to(self, header):
        pass
    def print_wd(self):
        for widget in self.walk():
            print("[]->{}".format(widget, widget.id))

    def on_current_tab(self, b, c):
        print(self.current_tab)
        #return super(MainPanel, self).on_current_tab()


    #print(usb_tab_wid)
    pass

class TestIcon(ButtonBehavior, Image):
    pass




class UsbScreenManager(ScreenManager):
    pass

class H2HScreen(Screen):
    pass


class V9validationScreen(Screen):
    pass


class RemoteScreenManager(ScreenManager):
    pass

class SDcardScreenManager(ScreenManager):
    pass




class NavLayout(GridLayout):
    pass

class LeftButton(Button):
    sm = ObjectProperty()
    mp = MainPanel()


    ct= mp.current_tab


    #print (ct)

    pass

class RightButton(Button):
    sm = ObjectProperty()
    panel = ObjectProperty()
    pass

class BackButton(Button):
    sm = ObjectProperty()
    panel = ObjectProperty()

    def active_panel():
        #if current tab is __ then load corresponding screen manager 
        pass
    pass



class Sam1App(App):
    def build(self):

        return MainPanel()

Builder.load_file("usb.kv")

if __name__ == '__main__':
    Sam1App().run()

Answer 1

我发现我覆盖了TabbedPanel的switch_to方法，但没有定义任何内容。所以TabbedPanel不知道要切换到什么，所以它什么都没显示。

Kivy的TabbedPanel中没有出现任何内容

1 个答案: