Kivy: Swiping (Carousel & ScreenManager) -

i have 2 screens in screenmanager both contains number of buttons in scrollview. idea 1 steps forward (right) clicking button. , step (left) swiping back. trying add carousel implement 1 swipe on second page. have tried:

self.root = screenmanager(id = 'screen_manager')  main_screen = screen(name = 'main_screen')  scroller = scroller() button_text = ['teach', 'move', 'b3', 'b4', 'b5', 'b6', 'b7', 'b8'] text in button_text:     scroller.view.add_widget(field(name=text, direction='left', current='teach')) main_screen.add_widget(scroller) self.root.add_widget(main_screen)  carousel = carousel(direction='left', id='carousel')  teach = screen(name = 'teach') scroller2 = scroller() button_text = ['vocab', 'drills'] text in button_text:     scroller2.view.add_widget(field(name=text, direction='right', current='main_screen')) carousel.add_widget(scroller2) teach.add_widget(carousel) self.root.add_widget(teach) 

but since have added second screen, it's not possible swipe in either direction. carousel's load_slide() method takes slide argument. assuming slide mean carousel. given going have lot pages, need carousel loaded dynamically, using add_widget() , remove_widget(). appreciate pointers.

working example of code have far: http://dpaste.com/33464r2

you can using screenmanager , gestures. (../kivy/examples/gestures/)

see here kivy-github-gestures

i have explained in code in comments.

first need create new python file named gesture_box.py.

gesture_strings copy here

from kivy.gesture import gesturedatabase kivy.uix.boxlayout import boxlayout kivy.gesture import gesture   [paste gesture_strings here]  #this database can compare gestures user makes stored     gestures  #and tell if user input matches of them. gestures = gesturedatabase() name, gesture_string in gesture_strings.items():     gesture = gestures.str_to_gesture(gesture_string)     gesture.name = name     gestures.add_gesture(gesture)  class gesturebox(boxlayout):      def __init__(self, **kwargs):         name in gesture_strings:             self.register_event_type('on_{}'.format(name))         super(gesturebox, self).__init__(**kwargs)      def on_left_to_right_line(self):         pass  #to recognize gesture, you’ll need start recording each individual event in #touch_down handler, add data points each call touch_move , , #gesture calculations when data points have been received in touch_up handler.      def on_touch_down(self, touch):         #create user defined variable , add touch coordinates          touch.ud['gesture_path'] = [(touch.x, touch.y)]             super(gesturebox, self).on_touch_down(touch)      def on_touch_move(self, touch):         touch.ud['gesture_path'].append((touch.x, touch.y))         super(gesturebox, self).on_touch_move(touch)      def on_touch_up(self, touch):         if 'gesture_path' in touch.ud:             #create gesture object             gesture = gesture()                 #add movement coordinates              gesture.add_stroke(touch.ud['gesture_path'])             #normalize thwu willtolerate size variations             gesture.normalize()             #minscore attained match true             match = gestures.find(gesture, minscore=0.3)             if match:                 print("{} happened".format(match[1].name))                 self.dispatch('on_{}'.format(match[1].name))         super(gesturebox, self).on_touch_up(touch) 

now create main.py file.

import gesture_box gesture kivy.app import app kivy.uix.boxlayout import boxlayout  class runner(gesture.gesturebox):     pass  class mainapp(app):     def build(self):         return runner()  if __name__ == '__main__':     app = mainapp()     app.run() 

and main.kv file

<runner>:     #handling gesture event.     on_left_to_right_line: manager.current = 'main_screen';  manager.transition.direction = 'right'     screenmanager:         id: manager         screen:             name: "main_screen"             boxlayout:                 orientation: 'vertical'                 label:                 button:                     text: "child 1"                     on_release:                          manager.current = "child1"                         manager.transition.direction = 'left'                  label:                 button:                     text: "child 2"                     on_release:                          manager.current = "child1"                         manager.transition.direction = 'left'                 label:          screen:             name: "child1"             label:                 text: "swipe left right go main screen (child 1)"          screen:             name: "child2"             label:                 text: "swipe left right go main screen (child 1)" 

edit: many people have asked me how these gesture string generated.

kivy guys provide in examples.

see here https://github.com/kivy/kivy/blob/master/examples/gestures/gesture_board.py run file.

python gesture_board.py

it should open blank window.

make gesture on using mouse or touch.

when on_touch_up event triggered, output gesture string in terminal.

for example output right_to_left_line be. this

('gesture representation:', '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') ('cross:', -1.2199187170964643) ('check:', -2.052277818300959) ('circle:', 0.4973932910874005) ('square:', 0.2907537534396739)

that's it, have string :d