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Source code for kivy.input.postproc.tripletap

Triple Tap

.. versionadded:: 1.7.0

Search touch for a triple tap

__all__ = ('InputPostprocTripleTap', )

from time import time
from kivy.config import Config
from kivy.vector import Vector

[docs]class InputPostprocTripleTap(object): ''' InputPostProcTripleTap is a post-processor to check if a touch is a triple tap or not. Triple tap can be configured in the Kivy config file:: [postproc] triple_tap_time = 250 triple_tap_distance = 20 The distance parameter is in the range 0-1000 and time is in milliseconds. ''' def __init__(self): dist = Config.getint('postproc', 'triple_tap_distance') self.triple_tap_distance = dist / 1000.0 time = Config.getint('postproc', 'triple_tap_time') self.triple_tap_time = time / 1000.0 self.touches = {}
[docs] def find_triple_tap(self, ref): '''Find a triple tap touch within *self.touches*. The touch must be not be a previous triple tap and the distance must be be within the bounds specified. Additionally, the touch profile must be the same kind of touch. ''' ref_button = None if 'button' in ref.profile: ref_button = ref.button for touchid in self.touches: if ref.uid == touchid: continue etype, touch = self.touches[touchid] if not touch.is_double_tap: continue if etype != 'end': continue if touch.is_triple_tap: continue distance = Vector.distance( Vector(ref.sx, ref.sy), Vector(touch.osx, touch.osy)) if distance > self.triple_tap_distance: continue if touch.is_mouse_scrolling or ref.is_mouse_scrolling: continue touch_button = None if 'button' in touch.profile: touch_button = touch.button if touch_button != ref_button: continue touch.triple_tap_distance = distance return touch
def process(self, events): if self.triple_tap_distance == 0 or self.triple_tap_time == 0: return events # first, check if a touch down have a triple tap for etype, touch in events: if not touch.is_touch: continue if etype == 'begin': triple_tap = self.find_triple_tap(touch) if triple_tap: touch.is_double_tap = False touch.is_triple_tap = True tap_time = touch.time_start - triple_tap.time_start touch.triple_tap_time = tap_time distance = triple_tap.triple_tap_distance touch.triple_tap_distance = distance # add the touch internally self.touches[touch.uid] = (etype, touch) # second, check if up-touch is timeout for triple tap time_current = time() to_delete = [] for touchid in self.touches.keys(): etype, touch = self.touches[touchid] if etype != 'end': continue if time_current - touch.time_start < self.triple_tap_time: continue to_delete.append(touchid) for touchid in to_delete: del self.touches[touchid] return events