Nested screenmanager

[Sam Peek]

class LoginScreen(Screen):

def goto_Mainscr(self):

self.current="Mainscr"

class MainScreen(Screen):

pass

class ScanScreen(Screen):

pass

class InventoryScreen(Screen):

pass

class ItemsScreen(Screen):

pass

class LogsScreen(Screen):

pass

class AlertsScreen(Screen):

pass

class HelpScreen(Screen):

pass

class MainManager(FloatLayout):

def __init__(self, **kwargs):

super(MainManager, self).__init__(**kwargs)

class Invtest3App(App):

def build(self):

return MainManager()

if __name__ == '__main__':

Invtest3App().run()

KV file:

<MainManager>:

    orientation: 'vertical'

    name: "mainm"

    id: mm

    ScreenManager:

        id: mainsm

        LoginScreen:

        MainScreen:

<LoginScreen>:

    name: "Loginscr"

    id: loginscr

    Button:

        name: "loginButton"

        text: "Login"

        background_color: 0,0,0,0

        pos_hint: {'x': 1.0/6.0, 'y': 0}

        size_hint: 1.0/6.0, 1

        on_press: root.goto_Mainscr()

<MainScreen>:

    name: "Mainscr"

    FloatLayout:

        pos_hint: {'top': 1}

        size_hint: 1, 0.1

        Button:

            name: "scanButton"

            text: "Scan"

            pos_hint: {'x': 0, 'y': 0}

            size_hint: 1.0/6.0, 1

            on_press: root.ids.sm.current = "Scan"

        Button:

            name: "inventoryButton"

            text: "Inventory"

            pos_hint: {'x': 1.0/6.0, 'y': 0}

            size_hint: 1.0/6.0, 1

            on_press: root.ids.sm.current = "Inventory"

        Button:

            name: "itemsButton"

            text: "Items"

            pos_hint: {'x': 2.0/6.0, 'y': 0}

            size_hint: 1.0/6.0, 1

            on_press: root.ids.sm.current = "Items"

        Button:

            name: "logsButton"

            text: "Logs"

            pos_hint: {'x': 3.0/6.0, 'y': 0}

            size_hint: 1.0/6.0, 1

            on_press: root.ids.sm.current = "Logs"

        Button:

            name: "alertsButton"

            text: "Alerts"

            pos_hint: {'x': 4.0/6.0, 'y': 0}

            size_hint: 1.0/6.0, 1

            on_press: root.ids.sm.current = "Alerts"

        Button:

            name: "helpButton"

            text: "Help"

            pos_hint: {'x': 5.0/6.0, 'y': 0}

            size_hint: 1.0/6.0, 1

            on_press: root.ids.sm.current = "Help"

    FloatLayout:

        ScreenManager:

            id: sm

            pos_hint: {'top': 0.9}

            size_hint: 1, 0.9

            ScanScreen:

            InventoryScreen:

            ItemsScreen:

            LogsScreen:

            AlertsScreen:

            HelpScreen:

Hi there,

I am working on an application and was wondering if it is possible to have a ScreenManager within a ScreenManager. The reason for this would be to have a login page using the full screen, and then screens that all use a navigation bar.

The code above tries to reflect this, could you please let me know wether this is possible and the best approach in kv AND python files together.

Many thanks.

[Gabriel Pettier]

Yes, this should work, and yes, it's a valid way to do it.

You might want to give an id to your MainScreen in MainManager, to be
able to do app.root.ids.mainmanager.ids.sm.current to get/set the
current screen.

Another if you don't want to nest ScreenManagers would be to have the
bars in all the screens, but just make them invisible (or move outside
of the screen) when in the LoginScreen (using a condition on self.name
could be a way).

But this way is fine, really.

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