test-kivy-app/kivy_venv/lib/python3.11/site-packages/kivy/input/postproc/retaintouch.py
2024-09-15 15:12:16 +03:00

94 lines
3.1 KiB
Python

'''
Retain Touch
============
Reuse touch to counter lost finger behavior
'''
__all__ = ('InputPostprocRetainTouch', )
from kivy.config import Config
from kivy.vector import Vector
import time
class InputPostprocRetainTouch(object):
'''
InputPostprocRetainTouch is a post-processor to delay the 'up' event of a
touch, to reuse it under certains conditions. This module is designed to
prevent lost finger touches on some hardware/setups.
Retain touch can be configured in the Kivy config file::
[postproc]
retain_time = 100
retain_distance = 50
The distance parameter is in the range 0-1000 and time is in milliseconds.
'''
def __init__(self):
self.timeout = Config.getint('postproc', 'retain_time') / 1000.0
self.distance = Config.getint('postproc', 'retain_distance') / 1000.0
self._available = []
self._links = {}
def process(self, events):
# check if module is disabled
if self.timeout == 0:
return events
d = time.time()
for etype, touch in events[:]:
if not touch.is_touch:
continue
if etype == 'end':
events.remove((etype, touch))
if touch.uid in self._links:
selection = self._links[touch.uid]
selection.ud.__pp_retain_time__ = d
self._available.append(selection)
del self._links[touch.uid]
else:
touch.ud.__pp_retain_time__ = d
self._available.append(touch)
elif etype == 'update':
if touch.uid in self._links:
selection = self._links[touch.uid]
selection.x = touch.x
selection.y = touch.y
selection.sx = touch.sx
selection.sy = touch.sy
events.remove((etype, touch))
events.append((etype, selection))
else:
pass
elif etype == 'begin':
# new touch, found the nearest one
selection = None
selection_distance = 99999
for touch2 in self._available:
touch_distance = Vector(touch2.spos).distance(touch.spos)
if touch_distance > self.distance:
continue
if touch2.__class__ != touch.__class__:
continue
if touch_distance < selection_distance:
# eligible for continuation
selection_distance = touch_distance
selection = touch2
if selection is None:
continue
self._links[touch.uid] = selection
self._available.remove(selection)
events.remove((etype, touch))
for touch in self._available[:]:
t = touch.ud.__pp_retain_time__
if d - t > self.timeout:
self._available.remove(touch)
events.append(('end', touch))
return events