Delayed Work using Clock

Mathieu Virbel edited this page Sep 27, 2013 · 1 revision


  • author: Mathieu Virbel
  • kivy: >= 1.0.6

The idea is to unroll a working loop to not block the UI. Let's imagine that you want to create thousand of images. If you are doing it in a loop, the UI will stuck until all the images are loaded and added.

You can create one image per frame for example, then the UI will be not stuck at all.


from kivy.clock import Clock

def delayed_work(func, items, delay=0):
    '''Apply the func() on each item contained in items
    if not items:
    def _delayed_work(*l):
        item = items.pop()
        if func(item) is False or not len(items):
            return False
        Clock.schedule_once(_delayed_work, delay)
    Clock.schedule_once(_delayed_work, delay)

# Usage example
def create_image(filename):
  image = Image(source=filename)

items = ['img1.png', 'img2.png', 'toto.png', 'azdmlk.png']
delayed_work(create_image, items)

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