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November 22, 2014 21:28
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TouchDispatcher.py
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# example of custom touch dispatch module | |
import ui | |
# wrapper class for Touch, since ui.Touch is readonly | |
class Touch(object): | |
def __init__(self,touch): | |
self.location=touch.location | |
self.touch_id=touch.touch_id | |
self.phase=touch.phase | |
self.prev_location=touch.prev_location | |
self.timestamp=touch.timestamp | |
class TouchDispatcher(ui.View): | |
def __init__(self,name='root',bg_color='blue'): | |
self.multitouch_enabled=True | |
self.bg_color=bg_color | |
self.name=name | |
def touch_began(self,touch): | |
# ideally would check hits, and dispatch if needed | |
# for multitouch, need to keep internal data base of active touches, since this gets called for each touch.... | |
print 'began', self.name, touch.touch_id | |
self.lasttouch=touch | |
def touch_moved(self,touch): | |
# ideally would check hits, and dispatch if needed, such as to scrollview | |
# note for multitouch we need something complex here. | |
print 'moved',self.name, touch.touch_id | |
self.lasttouch=touch | |
def touch_ended(self,touch): | |
# dispatch whatever is under the touch | |
# for multitouch probably only want to execute when there are no active touches left. | |
# this method would need to clean out touches, but still keep info on the active gesture. when there are no active touches left, then kill the gesture | |
# for now.... just look under the touch, and call something appropriate. | |
# need to handle each ui type! | |
print self.name, 'touch ended' | |
for s in self.subviews: | |
#probably need to check whether another view is on top... | |
if TouchDispatcher.hit(s,ui.convert_point(touch.location,self,s)): | |
if isinstance(s,ui.TextField): | |
print '..textfield begin editing' | |
s.begin_editing() | |
#think about setting cursor.... HARD! but possible i think? | |
elif isinstance(s, ui.Button): | |
print '..button launch' | |
s.action(s) | |
elif isinstance(s, TouchDispatcher): | |
# adjust touch location to subviews coordinates, then dispatch | |
print '..touch end: dispatch: ', s.name | |
t=Touch(touch) | |
t.location=ui.convert_point(touch.location,self,s) | |
s.touch_ended(t) | |
@staticmethod | |
def hit(uiobj,location): | |
''' check if location is inside uiobj's bounds''' | |
if location[0]<0 or location[1]<0 or location[0]>uiobj.width or location[1]>uiobj.height: | |
return False | |
else : | |
return True | |
if __name__=='__main__': | |
v=TouchDispatcher(name='root') | |
#populate some contents | |
b=ui.Button(frame=(10,10,100,100),bg_color='red',name='button1') | |
b.title='press' | |
t=ui.TextField(frame=(110,10,300,50),bg_color='white') | |
v.add_subview(t) | |
def myaction(sender): | |
print sender.name,' pressed' | |
b.action=myaction | |
v.add_subview(b) | |
#create a second dispatcher to demonstrate trickle down | |
v2=TouchDispatcher(name='second_view',bg_color='cyan') | |
v2.frame=(200,200,300,300) | |
b=ui.Button(frame=(10,10,100,100),bg_color='red',name='button2') | |
b.title='press' | |
b.action=myaction | |
t=ui.TextField(frame=(110,10,300,50),bg_color='white') | |
v2.add_subview(t) | |
v2.add_subview(b) | |
v.add_subview(v2) | |
#important! create overlay generic view, which hides events from the buttons,etc, and instead forces the underlying TouchDispatcher to handle. | |
# TODO.. add the overlay to init, then override add_subview, such that overlay is brought to front after any other subviews are added. | |
overlay=ui.View(frame=v.frame, name='overlay',bg_color=None) #transparent view | |
overlay.flex='wh' | |
v.add_subview(overlay) | |
v.present('sheet') | |
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