56. Carousel

The Carousel can be used to create a slide show. Here, we will have a 1-second delay between each slide.

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Since this is an application, we need the App class. The Carousel widget is the super class of the root. We use the Clock to create a 1-second timer.

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The root is based on Carousel. The update() function runs the Carousel's load_next() function to load the next slide.

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In the build() of the app, a title is set and a continuous 1-second timer is started.

# ex56.py
from kivy.app import App
from kivy.uix.carousel import Carousel
from kivy.clock import Clock

class Ex56(Carousel):
    def update(self, dt):
        self.load_next()

class Ex56App(App):
    def build(self):
        self.title = 'Carousel Example'
        ex56 = Ex56()
        Clock.schedule_interval(ex56.update, 1)
        return ex56

if __name__ == '__main__':
    Ex56App().run()

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In the kv file, a dynamic class MyImage is created so the images are stretched.

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For the root, the direction of Carousel is 'right' and looping is True. Here, we have the first 2 images.

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The next 3 slides are of images p3, p4 and p5.

# ex56.kv
<MyImage@Image>:
    keep_ratio: False
    allow_stretch: True
    
<Ex56>:
    direction: 'right'
    loop: True
    MyImage:
        source: 'p1.png'
    MyImage:
        source: 'p2.png'
    MyImage:
        source: 'p3.png'
    MyImage:
        source: 'p4.png'
    MyImage:
        source: 'p5.png'

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Demo of App on Youtube.