starting with Screen Manager

[حسن حيدري نسب‎]

Hi everyone

I'm New here. I couldn't use from screen manager when it's with kv.

Can you help me to use Screen Manager without kv part?

? How i can use subclass in python (not kv language) to create a layout on a Screen

[David Farris]

you might want to take a look at kivy\examples\widgets\screenmanager.py 

essentially you just create a class with the screen object and add it to your app. then you can add widgets to your screen object

class MainScreen(Screen):
    self.add_widget(Button())

class NameApp(App):
    def build(self):
        root = ScreenManager()
        root.add_widget(MainMenu(name='Main'))
        return root

[حسن حيدري نسب‎]

It shows a big widget. I want to create a layout like GridLayout ....

در چهارشنبه 11 سپتامبر 2013، ساعت 0:12:07 (UTC+4:30)، David Farris نوشته:

[Gabriel Pettier]

ScreenManager doesn't do that, you probably want to put ScreenManager
inside your GridLayout if you want for example, a menu atop the
screenmanager which controls it. If you want the opposite, a GridLayout
inside a Screen, then just do it the same way, widgets/layouts are meant
to be nested.

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[David Farris]

If you haven't already, take the time to go through the entire examples directory and try to understand how each example works, line by line. It helped me a lot.

[حسن حيدري نسب‎]

I did read it before but it wrote via kv part and i want to create a GridLayout out of kv language.

How do i use to Subclass for it (in python oniy) for control a Screen?

[حسن حيدري نسب‎]

Can you give me an example about Screen Manager that has two Screens and one GridLayout in each them without any kv language part ?

Thanks

[David Farris]

from kivy.app import App
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.properties import NumericProperty
from kivy.lang import Builder

Builder.load_string('''
#:import random random.random
#:import SlideTransition kivy.uix.screenmanager.SlideTransition
#:import SwapTransition kivy.uix.screenmanager.SwapTransition
#:import WipeTransition kivy.uix.screenmanager.WipeTransition
#:import FadeTransition kivy.uix.screenmanager.FadeTransition
<CustomScreen>:
    hue: random()
    canvas:
        Color:
            hsv: self.hue, .5, .3
        Rectangle:
            size: self.size

    Label:
        font_size: 42
        text: root.name
    GridLayout:
        cols: 3
        size_hint: .5, None
        height: 250
        pos_hint: {'center_x': .5}

       
        Button:
            text: 'Next screen'
            on_release: root.manager.current = root.manager.next()
   
        Button:
            text: 'Previous screen'
            on_release: root.manager.current = root.manager.previous()


        Button:
            text: 'Slide "up"'
            on_release: root.manager.transition = SlideTransition(direction="up")

        Button:
            text: 'Slide "down"'
            on_release: root.manager.transition = SlideTransition(direction="down")

        Button:
            text: 'Slide "left"'
            on_release: root.manager.transition = SlideTransition(direction="left")

        Button:
            text: 'Slide "right"'
            on_release: root.manager.transition = SlideTransition(direction="right")

        Button:
            text: 'Swap'
            on_release: root.manager.transition = SwapTransition()

        Button:
            text: 'Wipe'
            on_release: root.manager.transition = WipeTransition()

        Button:
            text: 'Fade'
            on_release: root.manager.transition = FadeTransition()
''')

class CustomScreen(Screen):
    hue = NumericProperty(0)

class ScreenManagerApp(App):

    def build(self):
        root = ScreenManager()

        for x in xrange(4):
            root.add_widget(CustomScreen(name='Screen %d' % x))
        return root

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

[حسن حيدري نسب‎]

I saw it before but it has the kv language part.

I want to put a GridLayout in each Screen and i want to do it without a kv language.

? there isn't any way

How can i use " self.add_widget(Button()) " on a screen ? (not "Button:" that is in kv part) .

[Gabriel Pettier]

Well, Screen is a Widget, so you can create your screen

screen = Screen(name='test')

add widgets to it

btn = Button(text='test')
button.bind(on_press=something)
screen.add_widget(button)

well, just like with any widget in kivy…

[حسن حيدري نسب‎]

Ow thank you very much

That worked!

[Ken Samson]

Can you share what worked? Basically building a screen by explicitly adding elements, like a grid layout in java/swing? Thank you.

[Kenneth Boyd]

I know this is an old post, but I was looking for info on this and found a good example here: 

http://stackoverflow.com/questions/19491286/kivy-changing-screens-in-screen-manager-with-an-on-press-event

[SERWANO JONATHAN]

OOOOH men this is what have been looking for all week
thaks baddy