kivy 11 layout

#layout.py

from kivy.uix.label import Label

from kivy.uix.image import Image

from kivy.lang import Builder

from kivy.base import runTouchApp

Builder.load_string('''

<RootWidget>:

    Image:

        source: 'img/1.jpg'

        allow_stretch: True

        keep_ratio: False

    Image:

        source: 'img/5.jpg'

        allow_stretch: True

        keep_ratio: False

    Image:

        source: 'img/6.jpg'

        allow_stretch: True

        keep_ratio: False

''')

class RootWidget(Label):

    def do_layout(self, *args):

        number_of_children = len(self.children)

        width = self.width

        width_per_child = int(width / number_of_children)

        positions = range(0, width, width_per_child)

        for position, child in zip(positions, self.children):

            child.height = self.height

            child.x = self.x + position

            child.y = self.y

            child.width = width_per_child

    def on_size(self, *args):

        self.do_layout()

    def on_pos(self, *args):

        self.do_layout()

    def add_widget(self, widget, index=0, canvas=None):

        super(RootWidget, self).add_widget(widget)

        self.do_layout()

    def remove_widget(self, widget):

        super(RootWidget, self).add_widget(widget)

        self.do_layout()

runTouchApp(RootWidget())

reference:

https://www.youtube.com/watch?v=0n8Rar3CgdI&list=PLdNh1e1kmiPP4YApJm8ENK2yMlwF1_edq&index=10