Interesting, I wasn't aware of the gesture recognizer technique in @mikael's link.
Here's a little demo of using that with objc_util. It's far from perfect, more of a proof-of-concept... The biggest limitation I see is that while scrolling works everywhere, other touches on pages that aren't the current page are ignored, i.e. if you have a button or something like that on one of the pages, it'll only work if that page is selected (in the middle of the screen in this demo). There are probably ways around that, I haven't investigated this much further.
import ui
from objc_util import *
from random import random
class PagingScrollContainer (ui.View):
def __init__(self, scroll_view, **kwargs):
ui.View.__init__(self, **kwargs)
self.scroll_view = scroll_view
# Center the scroll view horizontally:
scroll_view.frame = (self.bounds.w/2 - scroll_view.bounds.w/2, 0, scroll_view.bounds.w, self.bounds.h)
scroll_view.flex = 'HLR'
scroll_view.shows_horizontal_scroll_indicator = False
self.add_subview(scroll_view)
# Turn off clipping:
_scroll_view = ObjCInstance(scroll_view)
_scroll_view.clipsToBounds = False
# Make sure paging is enabled (that's the point after all)
_scroll_view.pagingEnabled = True
# Add the scroll view's gesture recognizer to this view:
_self = ObjCInstance(self)
_self.addGestureRecognizer_(_scroll_view.panGestureRecognizer())
def main():
# Create a ScrollView with some colored "pages" as a demo...
page_w = 200
scroll_view = ui.ScrollView(frame=(0, 0, page_w, 500))
scroll_view.content_size = (50 * page_w, 0)
for i in range(50):
swatch_frame = (i*page_w, 0, page_w, 500)
swatch = ui.View(bg_color=(random(), random(), random()), frame=swatch_frame)
scroll_view.add_subview(swatch)
# Wrap it in the custom container view, and present that:
container = PagingScrollContainer(scroll_view, frame=(0, 0, 500, 500))
container.present('sheet')
if __name__ == '__main__':
main()
