incorrect touch locations

[JonB]

I believe this is a new bug:

import ui,console
class Touchy(ui.View):
	def __init__(self,*args,**kwargs):
		ui.View.__init__(self,*args,**kwargs)
		self.add_subview(ui.View(frame=(300,300,44,44),bg_color='red'))
	def touch_began(self,touch):
		console.hud_alert('{p.x},{p.y}'.format(p=touch.location))
v=Touchy(frame=(0,0,600,600)).present('sheet')

Touch near but not on the red square.
Result, a value near 300,300, as expected.
Now touch the red square:
result is touch location relative to the subview coords, rather than the custom view.

I believe the way it used to work is that a Touch location was the location relative to the custom view which implemented the touch methods. This makes more sense, since a Touch does not contain any info about which subview was touched.

As is, it is impossible to know where you actually touched, if implementing touch on a View subclass which has subviews which are vanilla View's.
I am pretty sure this used to work properly, but I'm not sure.

[mikael]

Interesting, I did not know you get the touches from the "on top" vanilla view at all.

But regardless, does this behavior change if you make the red square not touch enabled?

[JonB]

unfortunately, a longstanding bug is that there is no way to set touch_enabled=False for a vanilla View. It stays True.

The way I think it is supposed to work, if a view does not implement touch, the touch events should trickle up to the container, etc. But touches that trickle up should be in the frame of whoever is handling the touch I think.

[mikael]

Touch handling really seems to be the most underdeveloped area in the ui module. I find myself using various workarounds for the simplest things. And bugs do not help, of course.