[英]How to navigate through screens in Kivy?
I am trying to create an application with two screens, one is the login screen and next is the main page. 我正在尝试用两个屏幕创建一个应用程序,一个是登录屏幕,然后是主页。 I'm unable to incorporate Kivy code for my second screen.
我无法在第二个屏幕上合并Kivy代码。 How can I add code so I can switch to the second screen?
如何添加代码,以便可以切换到第二个屏幕?
from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.image import Image
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.lang import Builder
from kivy.uix.label import Label
class SigninWindow(BoxLayout):
def __init__(self, **kwargs):
super().__init__(**kwargs)
def validate_user(self):
user = self.ids.username_field
pwd = self.ids.pwd_field
info = self.ids.info
uname = user.text
passw = pwd.text
if uname == '' or passw == '':
info.text = '[color=#FF0000]username and/ or password required[/color]'
else:
if uname == 'admin' and passw == 'admin':
info.text = '[color=#00FF00]Logged In successfully![/color]'
else:
info.text = '[color=#FF0000]Invalid Username and/or Password[/color]'
class SigninApp(App):
def build(self):
return SigninWindow()
if __name__=="__main__":
sa = SigninApp()
sa.run()
kvfile: kv文件:
<FlatButton@ButtonBehavior+Label>:
font_size: 16
<SigninWindow>:
id: main_win
orientation: "vertical"
spacing: 10
space_x: self.size[0]/3
canvas.before:
Color:
rgba: (1,1,1, 1)
Rectangle:
size: self.size
pos: self.pos
BorderImage:
source: 'E:\pythonpics/blu2.png'
pos: self.pos
size: self.size
BoxLayout:
size_hint_y: None
height: 50
canvas.before:
Color:
rgba: (.06, .45, .45, 1)
Rectangle:
size: self.size
pos: self.pos
Label:
text: "Hello! Dear User Please Sign In"
bold: True
size_hint_x: .9
BoxLayout:
orientation: 'vertical'
padding: main_win.space_x, 10
#spacing: 20
BoxLayout:
orientation: "vertical"
spacing: 10
size_hint_y: None
height: 100
Label:
id: info
text: ''
markup: True
size_hint_y: None
height: 20
TextInput:
id: username_field
hint_text: "Username"
multiline: False
focus: True
on_text_validate: pwd_field.focus = True
TextInput:
id: pwd_field
hint_text: "Password"
multiline: False
password: True
on_text_validate: root.validate_user()
Label:
id: sp
size_hint_y: None
height: 40
Button:
text: "Sign In"
size_hint_y: None
height: 40
background_color: (.06,.45,.45, 1)
background_normal: ''
on_release: root.validate_user()
Label:
id: sp2
Welcome to Stackoverflow! 欢迎来到Stackoverflow!
You need a ScreenManager
and Screen
s. 您需要一个
ScreenManager
和Screen
。 You can switch to a specific screen via ScreenManager.current = "Name of Other Screen"
. 您可以通过
ScreenManager.current = "Name of Other Screen"
切换到特定屏幕。
You might want to change your widgets, so you can omit something like App.get_running_app().root.current
. 您可能想要更改窗口小部件,因此可以省略诸如
App.get_running_app().root.current
。
Your app python code:
from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.image import Image
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.lang import Builder
from kivy.uix.label import Label
Builder.load_string("""
<Rootwidget>:
Screen:
name: "SignIn"
SigninWindow:
Screen:
name: "SignedIn"
Label:
text: "You have signed in."
<FlatButton@ButtonBehavior+Label>:
font_size: 16
<SigninWindow>:
id: main_win
orientation: "vertical"
spacing: 10
space_x: self.size[0]/3
canvas.before:
Color:
rgba: (1,1,1, 1)
Rectangle:
size: self.size
pos: self.pos
BorderImage:
source: 'E:\pythonpics/blu2.png'
pos: self.pos
size: self.size
BoxLayout:
size_hint_y: None
height: 50
canvas.before:
Color:
rgba: (.06, .45, .45, 1)
Rectangle:
size: self.size
pos: self.pos
Label:
text: "Hello! Dear User Please Sign In"
bold: True
size_hint_x: .9
BoxLayout:
orientation: 'vertical'
padding: main_win.space_x, 10
#spacing: 20
BoxLayout:
orientation: "vertical"
spacing: 10
size_hint_y: None
height: 100
Label:
id: info
text: ''
markup: True
size_hint_y: None
height: 20
TextInput:
id: username_field
hint_text: "Username"
multiline: False
focus: True
on_text_validate: pwd_field.focus = True
TextInput:
id: pwd_field
hint_text: "Password"
multiline: False
password: True
on_text_validate: root.validate_user()
Label:
id: sp
size_hint_y: None
height: 40
Button:
text: "Sign In"
size_hint_y: None
height: 40
background_color: (.06,.45,.45, 1)
background_normal: ''
on_release: root.validate_user()
Label:
id: sp2
""")
class Rootwidget(ScreenManager):
pass
class SigninWindow(BoxLayout):
def __init__(self, **kwargs):
super().__init__(**kwargs)
def validate_user(self):
user = self.ids.username_field
pwd = self.ids.pwd_field
info = self.ids.info
uname = user.text
passw = pwd.text
if uname == '' or passw == '':
info.text = '[color=#FF0000]username and/ or password required[/color]'
else:
if uname == 'admin' and passw == 'admin':
info.text = '[color=#00FF00]Logged In successfully![/color]'
App.get_running_app().root.current = "SignedIn"
else:
info.text = '[color=#FF0000]Invalid Username and/or Password[/color]'
class SigninApp(App):
def build(self):
return Rootwidget()
if __name__=="__main__":
sa = SigninApp()
sa.run()
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