android - 简单的 kivy 选项卡示例

Question

我是使用 Kivy 进行 Android 开发的新手。我创建了一个如下所示的标签结构:

from kivy.app import App
from kivy.uix.tabbedpanel import TabbedPanel
from kivy.uix.tabbedpanel import TabbedPanelHeader
from kivy.uix.button import Button
from kivy.uix.label import Label
from kivy.uix.image import Image

class TabbedPanelApp(App):
  def build(self):
      tb_panel= TabbedPanel()

      # Create text tab          
      th_text_head = TabbedPanelHeader(text='Text tab')
      th_text_head.content= Label(text='This is my text content')

      # Create image tab
      th_img_head= TabbedPanelHeader(text='Image tab')
      th_img_head.content= Image(source='sample.jpg',pos=(400, 100), size=(400, 400))

      # Create button tab
      th_btn_head = TabbedPanelHeader(text='Button tab')
      th_btn_head.content= Button(text='This is my button',font_size=20)

      tb_panel.add_widget(th_text_head)
      tb_panel.add_widget(th_img_head)
      tb_panel.add_widget(th_btn_head)          

      return tb_panel

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

我想将登录小部件添加到默认选项卡。登录小部件的代码是:

import kivy 
kivy.require('1.0.5')

from kivy.uix.gridlayout import GridLayout 
from kivy.uix.boxlayout import BoxLayout 
from kivy.uix.button import Button 
from kivy.app import App 
from kivy.lang import Builder 
from kivy.uix.widget import Widget 
from kivy.properties import ObjectProperty, StringProperty 

class loginView(Widget): 
    status=ObjectProperty(None) 
    def validate(self,username,password): 
        print "user - ", username
        print "pwd - ", password
        if username == password: 
            print "in if - ", username,password     
            self.status.text="Login sucess" 
        #mainClass().run() 
        else: 
            self.status.text="Login failed" 

class afterLogin(Widget): 
    def dumb(self): 
        l = BoxLayout(cols="2") 
        btn = Button(text="ad") 
        l.add_widget(btn) 
        print "flag" 

class mainClass(App): 
    def build(self): 
        return loginView()  

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

kv 文件是:

#:kivy 1.0.5 

<loginView>: 
    status:result 
    Label: 
         text:"Contacts Manager" 
         pos:600,600 
         font_size:40 


    Label: 
         text:"Username" 
         pos:450,400 

    Label: 
         text:"Password" 
         pos:450,300 

    TextInput: 
         multiline:False 
         pos:600,425 
         size:200,45 
         font_size:20 
         id:username 

    TextInput: 
         multiline:False 
         pos:600,325 
         password:True 
         size:200,45 
         font_size:20 
         id:password 
    Button: 
         text:"Login" 
         size:100,50 
         pos:600,250 
         on_press:root.validate(username.text,password.text) 
    Label: 
         text:"" 
         pos:600,100 
         id:result 
<afterLogin>: 
    Label: 
         text:"Welcome" 

如何将此代码添加到默认选项卡中？

Answer 1

您可以使用以下 2 个属性:default_tab_text 和 default_tab_content。

因此，假设您的登录代码是以下代码(您的行不通):

import kivy 
kivy.require('1.0.5')

from kivy.uix.gridlayout import GridLayout
from kivy.uix.label import Label 
from kivy.lang import Builder

Builder.load_string("""
<Loginview>:
    cols:2
    padding: 200
    Label: 
        text: "username"
    TextInput:
    Label: 
        text: "password"
    TextInput:
""")

#Name of classes are always uppercase
class LoginView(GridLayout): 
    pass

假设该代码与 main.py(具有 TabbedPanelApp 的代码)位于同一文件夹中。然后

1)导入LoginView(我把它大写，因为它是一个类)

from login import LoginView

2)修改TabbedPanelApp的build方法如下

class TabbedPanelApp(App):
    def build(self):
        tb_panel= TabbedPanel()
        tb_panel.default_tab_text = "Login Tab"
        tb_panel.default_tab_content = LoginView()

您还可以使用 default_tab_cls 属性修改整个 TabbedPanelHeader，甚至可以使用 do_default_tab 属性停用默认选项卡。所以，你有很多选择。看看doc