======Kivy: Liste des éléments graphiques Widgets de comportement et Gestion d'écrans======
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===== Screen manager =====

Gérer plusieurs écrans: options, menu ... {{media_12:screenmanager1.png?300|fig:Screenmanager1.png}}

<code python screen_manager.py>
#! /usr/bin/env python3
# -*- coding: utf-8 -*-

import kivy
kivy.require('1.8.0')

from kivy.app import App
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.screenmanager import ScreenManager, Screen

class MenuScreen(Screen):
    '''Lit <MenuScreen>: dans kv soit:
    <MenuScreen>:
        BoxLayout:
            Button:
                text: 'Définir les options'
                on_press: root.manager.current = 'Options'
            Button:
                text: 'Quitter'
    '''
    pass

class SettingsScreen(Screen):
    # Lit <SettingsScreen>: dans kv
    pass

class ScreenmanagerApp(App):
    def build(self):
        sm = ScreenManager()
        # Appel de la classe qui lit kv
        sm.add_widget(MenuScreen(name='Menu'))
        # Appel de la classe qui lit kv
        sm.add_widget(SettingsScreen(name='Options'))
        # Retourne root = sm
        return sm

if __name__ == '__main__':
    ScreenmanagerApp().run()
</code>

<code python screenmanager.kv>
#:kivy 1.8.0

<MenuScreen>:
    BoxLayout:
        Button:
            text: 'Définir les options'
            font_size: 36
            on_press: root.manager.current = 'Options'
        Button:
            font_size: 36
            text: 'Quitter'

<SettingsScreen>:
    BoxLayout:
        Button:
            text: "Mon bouton d'options"
            font_size: 36
        Button:
            text: 'Retour au menu'
            font_size: 36
            on_press: root.manager.current = 'Menu'
</code>

===== Carrousel =====

Le widget Carousel fournit la vue carrousel = mobile-friendly classique où vous pouvez glisser entre les diapositives.

Il faut toujours que la doc rajoute des notions nouvelles dans l'exemples de bases: nul !

<code python carousel_ex0.py>
#! /usr/bin/env python3
# -*- coding: utf-8 -*-

import kivy
kivy.require('1.8.0')

from kivy.app import App
from kivy.uix.carousel import Carousel
from kivy.factory import Factory

class Example1(App):

    def build(self):
        carousel = Carousel(direction='right')
        for i in range(4):
            src = "http://placehold.it/480x270.png&text=slide-%d&.png" % i
            image = Factory.AsyncImage(source=src, allow_stretch=True)
            carousel.add_widget(image)
        return carousel

Example1().run()
</code>
==== Avec kv, sans notions nouvelles ====

<code python carousel_ex.py>
#! /usr/bin/env python3
# -*- coding: utf-8 -*-

import kivy
kivy.require('1.8.0')
from kivy.app import App
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.carousel import Carousel
from kivy.clock import Clock

class Nothing:
    def print_some(self, some):
        print(some)

class MainScreen(Screen):
    pass

class Screen1(Screen, Nothing):
    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        # Cet objet (donc self!) hérite des méthodes et attributs de Nothing
        self.print_some("je suis le plus fort")

class Screen2(Screen):
    pass

SCREENS = { 0: (MainScreen,       "Menu"),
            1: (Screen1,          "Ecran 1"),
            2: (Screen2,          "Ecran 2")}

class Carousel_ExApp(App):
    def build(self):
        carousel = Carousel(direction='right')
        for i in range(3):
            carousel.add_widget(SCREENS[i][0](name=SCREENS[i][1]))
        return carousel

if __name__ == '__main__':
    Carousel_ExApp().run()
</code>
**carousel_1.kv**

<code python>
#:kivy 1.8.0
<MainScreen>:
    BoxLayout:
        Label:
            text: 'Menu principal'
            font_size: 36
<Screen1>:
    BoxLayout:
        Label:
            text: 'ecran 1'
            font_size: 36
<Screen2>:
    BoxLayout:
        Label:
            text: 'ecran 2'
            font_size: 36
</code>
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