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