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Pure Python gestures
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@Anxietier, and a version with a revealed label and a refresh trigger:
import ui import scripter v = ui.View(background_color='black') class Pulled(ui.View): straight_pull = 30 slowing_pull = 80 def touch_began(self, t): self.start_y = ui.convert_point(t.location, from_view=self).y def touch_moved(self, t): delta_y = ( ui.convert_point(t.location, from_view=self).y - ui.convert_point(t.prev_location, from_view=self).y) if self.y < self.straight_pull: self.y += delta_y return if self.y < (self.straight_pull + self.slowing_pull): diff = self.y-self.straight_pull diff_fraction = diff/self.slowing_pull try: self.reveal_func(diff_fraction) except AttributeError: pass effective = 1 - min(1, diff_fraction) ** 2 self.y += delta_y * effective def touch_ended(self, t): scripter.y(self, 0, ease_func=scripter.ease_out) try: self.reveal_func(0) except AttributeError: pass if self.y > self.straight_pull: self.trigger_func() label = ui.Label(text='Release to refresh', text_color='white', flex='LBR', alpha=0, ) label.size_to_fit() label.center = v.bounds.center() label.y = 8 v.add_subview(label) def reveal(fraction): label.alpha = fraction def trigger(): scripter.hide(label) print('refresh') v.add_subview(Pulled( reveal_func=reveal, trigger_func=trigger, frame=v.bounds, flex='WH', background_color='green')) v.present('fullscreen')
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@Anxietier, oh, you can throw away the
touch_began
method, itโs from an earlier version. -
@mikael thank you
and if i want to bind it with gestures, what should i do
i mean is there any conflict between gestures and touch
what i want to make is, i can use twin fingers to zoom and move picture(imageview or subclass zoompanview, later is better i guess), and when i move picture, move space and scale would be limited, as i leave my fingers, picture's edge should be forced move to superview's edge -
@mikael ah, dont bother
i didnt read doc carefully(perhaps wrong word :P), now i can bind them together, thanks for ur help, ur codes are really amazing and helpful :D -
@Anxietier, little optimization of the โfeelโ and code simplification.
import ui import scripter v = ui.View(background_color='black') class Pulled(ui.View): trigger_distance = 30 pull_distance = 80 def touch_moved(self, t): delta_y = ( ui.convert_point(t.location, from_view=self).y - ui.convert_point(t.prev_location, from_view=self).y) diff_fraction = self.y/self.pull_distance try: self.reveal_func(diff_fraction) except AttributeError: pass self.y += delta_y * (1 - min(0.9, diff_fraction) ** 2) self.y = max(0, self.y) def touch_ended(self, t): scripter.y(self, 0, ease_func=scripter.ease_out) try: self.reveal_func(0) except AttributeError: pass if self.y > self.trigger_distance: self.trigger_func() label = ui.Label(text='Release to refresh', text_color='white', flex='LBR', alpha=0, ) label.size_to_fit() label.center = v.bounds.center() label.y = 8 v.add_subview(label) def reveal(fraction): label.alpha = fraction def trigger(): scripter.hide(label) print('refresh') v.add_subview(Pulled( reveal_func=reveal, trigger_func=trigger, frame=v.bounds, flex='WH', background_color='green')) v.present('fullscreen')
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!!! Removed by poster to not confuse future readers with incorrect Code Examples.. ๐ค๐
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@mikael
thanks for help, i make it
but there's another problem showed up:
i make a main view, then i subclass zoomPanView and add to mainView , after that i add imageView as zoomPanView's subVIew, like what zoomPanDemo did, when i overwrite on_pan method and test it, data.began and data.changed can give me right value, but data.ended not, i dont know why -
@stephen thanks for help!
im would try to understand ur code, im not good in math though :(
btw, i tried mikael's code, and it works fine to me :P -
@Anxietier said:
@mikael
thanks for help, i make it
but there's another problem showed up:
i make a main view, then i subclass zoomPanView and add to mainView , after that i add imageView as zoomPanView's subVIew, like what zoomPanDemo did, when i overwrite on_pan method and test it, data.began and data.changed can give me right value, but data.ended not, i dont know whyone more thing, i overwrote on_pinch too, and i printed data.ended, and got right value, maybe two gesture's ended flag conflict ?
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@Anxietier, thanks for catching this. Pan end event was not properly handled, fixed now in the version on the repo.
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@Anxietier said:
@Anxietier said:
@mikael
thanks for help, i make it
but there's another problem showed up:
i make a main view, then i subclass zoomPanView and add to mainView , after that i add imageView as zoomPanView's subVIew, like what zoomPanDemo did, when i overwrite on_pan method and test it, data.began and data.changed can give me right value, but data.ended not, i dont know whyone more thing, i overwrote on_pinch too, and i printed data.ended, and got right value, maybe two gesture's ended flag conflict ?
i resolved this issue
i subclass both view and GestureMixin as new ZoomPanView, then i overwrite touch_ended, so that when i subclass new ZoomPanView i can edit touch_ended,
high encapsulation not always convenient XD -
@mikael said:
@Anxietier, thanks for catching this. Pan end event was not properly handled, fixed now in the version on the repo.
expecting for new version (๐ อกโโฏอส อกโ)๐
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@Anxietier, is there a specific reason why you are using the Python version instead of the native iOS gestures? Just curious, because I no longer remember why I wrote pygestures. ๐ ... Probably just because I wanted to see if I could do it.
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@mikael
well, im not good at math, i tried use touch_began\move\ended, and surely i can make simple function, but as it became complex, my brain be in chaos, XD -
@Anxietier, I meant choosing between
gestures.py
(wrapper around iOS native gestures) andpygestures.py
(pure Python gestures built on top of theui.View.touch_x
method โprimitivesโ.Your answer leads me to guess you might not have been aware of the first option.
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@mikael oh, i did try gesture.py, got some problems, and you suggested me subclass ZoomPanView instead for my need, then i did and i find it's interesting, so ~~ :))
@mikael said:
@Anxietier, can you subclass
ZoomPanView
instead?If you run
pygestures.py
and swipe from the right, you get the demo picture that you can pan and zoom, and that seems to work ok.The code for it is at the end of the file.
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@Anxietier, oh, and I thought you were already using the python version, given the title of this discussion thread... ๐
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do you still need help with drag/friction algorithm ?
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@stephen
thank you, maybe not, i did solve this problem (probably not yet)
thanks for your help :) -
@mikael
haha, I was trying to make a zoom demo, but the effect is not good, so I googled key words "pythonista 2 finger zoom", then luckily found this XD