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thatscringebro
383
kivy/input/providers/mtdev.py
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383
kivy/input/providers/mtdev.py
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'''
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Native support for Multitouch devices on Linux, using libmtdev.
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===============================================================
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The Mtdev project is a part of the Ubuntu Maverick multitouch architecture.
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You can read more on http://wiki.ubuntu.com/Multitouch
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To configure MTDev, it's preferable to use probesysfs providers.
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Check :py:class:`~kivy.input.providers.probesysfs` for more information.
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Otherwise, add this to your configuration::
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[input]
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# devicename = hidinput,/dev/input/eventXX
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acert230h = mtdev,/dev/input/event2
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.. note::
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You must have read access to the input event.
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You can use a custom range for the X, Y and pressure values.
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On some drivers, the range reported is invalid.
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To fix that, you can add these options to the argument line:
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* invert_x : 1 to invert X axis
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* invert_y : 1 to invert Y axis
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* min_position_x : X minimum
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* max_position_x : X maximum
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* min_position_y : Y minimum
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* max_position_y : Y maximum
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* min_pressure : pressure minimum
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* max_pressure : pressure maximum
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* min_touch_major : width shape minimum
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* max_touch_major : width shape maximum
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* min_touch_minor : width shape minimum
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* max_touch_minor : height shape maximum
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* rotation : 0,90,180 or 270 to rotate
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An inverted display configuration will look like this::
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[input]
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# example for inverting touch events
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display = mtdev,/dev/input/event0,invert_x=1,invert_y=1
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'''
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__all__ = ('MTDMotionEventProvider', 'MTDMotionEvent')
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import os
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import os.path
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import time
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from kivy.input.motionevent import MotionEvent
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from kivy.input.shape import ShapeRect
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class MTDMotionEvent(MotionEvent):
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def __init__(self, *args, **kwargs):
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kwargs.setdefault('is_touch', True)
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kwargs.setdefault('type_id', 'touch')
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super().__init__(*args, **kwargs)
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def depack(self, args):
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if 'x' in args:
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self.sx = args['x']
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else:
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self.sx = -1
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if 'y' in args:
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self.sy = args['y']
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else:
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self.sy = -1
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self.profile = ['pos']
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if 'size_w' in args and 'size_h' in args:
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self.shape = ShapeRect()
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self.shape.width = args['size_w']
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self.shape.height = args['size_h']
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self.profile.append('shape')
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if 'pressure' in args:
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self.pressure = args['pressure']
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self.profile.append('pressure')
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super().depack(args)
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def __str__(self):
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i, sx, sy, d = (self.id, self.sx, self.sy, self.device)
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return '<MTDMotionEvent id=%d pos=(%f, %f) device=%s>' % (i, sx, sy, d)
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if 'KIVY_DOC' in os.environ:
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# documentation hack
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MTDMotionEventProvider = None
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else:
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import threading
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import collections
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from kivy.lib.mtdev import Device, \
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MTDEV_TYPE_EV_ABS, MTDEV_CODE_SLOT, MTDEV_CODE_POSITION_X, \
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MTDEV_CODE_POSITION_Y, MTDEV_CODE_PRESSURE, \
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MTDEV_CODE_TOUCH_MAJOR, MTDEV_CODE_TOUCH_MINOR, \
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MTDEV_CODE_TRACKING_ID, MTDEV_ABS_POSITION_X, \
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MTDEV_ABS_POSITION_Y, MTDEV_ABS_TOUCH_MINOR, \
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MTDEV_ABS_TOUCH_MAJOR
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from kivy.input.provider import MotionEventProvider
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from kivy.input.factory import MotionEventFactory
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from kivy.logger import Logger
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class MTDMotionEventProvider(MotionEventProvider):
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options = ('min_position_x', 'max_position_x',
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'min_position_y', 'max_position_y',
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'min_pressure', 'max_pressure',
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'min_touch_major', 'max_touch_major',
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'min_touch_minor', 'max_touch_minor',
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'invert_x', 'invert_y',
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'rotation')
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def __init__(self, device, args):
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super(MTDMotionEventProvider, self).__init__(device, args)
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self._device = None
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self.input_fn = None
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self.default_ranges = dict()
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# split arguments
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args = args.split(',')
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if not args:
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Logger.error('MTD: No filename pass to MTD configuration')
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Logger.error('MTD: Use /dev/input/event0 for example')
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return
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# read filename
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self.input_fn = args[0]
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Logger.info('MTD: Read event from <%s>' % self.input_fn)
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# read parameters
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for arg in args[1:]:
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if arg == '':
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continue
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arg = arg.split('=')
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# ensure it's a key = value
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if len(arg) != 2:
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err = 'MTD: Bad parameter %s: Not in key=value format' %\
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arg
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Logger.error(err)
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continue
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# ensure the key exist
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key, value = arg
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if key not in MTDMotionEventProvider.options:
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Logger.error('MTD: unknown %s option' % key)
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continue
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# ensure the value
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try:
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self.default_ranges[key] = int(value)
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except ValueError:
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err = 'MTD: invalid value %s for option %s' % (key, value)
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Logger.error(err)
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continue
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# all good!
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Logger.info('MTD: Set custom %s to %d' % (key, int(value)))
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if 'rotation' not in self.default_ranges:
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self.default_ranges['rotation'] = 0
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elif self.default_ranges['rotation'] not in (0, 90, 180, 270):
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Logger.error('HIDInput: invalid rotation value ({})'.format(
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self.default_ranges['rotation']))
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self.default_ranges['rotation'] = 0
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def start(self):
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if self.input_fn is None:
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return
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self.uid = 0
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self.queue = collections.deque()
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self.thread = threading.Thread(
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name=self.__class__.__name__,
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target=self._thread_run,
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kwargs=dict(
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queue=self.queue,
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input_fn=self.input_fn,
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device=self.device,
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default_ranges=self.default_ranges))
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self.thread.daemon = True
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self.thread.start()
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def _thread_run(self, **kwargs):
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input_fn = kwargs.get('input_fn')
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queue = kwargs.get('queue')
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device = kwargs.get('device')
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drs = kwargs.get('default_ranges').get
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touches = {}
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touches_sent = []
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point = {}
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l_points = {}
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def assign_coord(point, value, invert, coords):
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cx, cy = coords
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if invert:
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value = 1. - value
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if rotation == 0:
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point[cx] = value
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elif rotation == 90:
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point[cy] = value
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elif rotation == 180:
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point[cx] = 1. - value
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elif rotation == 270:
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point[cy] = 1. - value
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def process(points):
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for args in points:
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# this can happen if we have a touch going on already at
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# the start of the app
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if 'id' not in args:
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continue
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tid = args['id']
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try:
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touch = touches[tid]
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except KeyError:
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touch = MTDMotionEvent(device, tid, args)
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touches[touch.id] = touch
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touch.move(args)
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action = 'update'
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if tid not in touches_sent:
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action = 'begin'
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touches_sent.append(tid)
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if 'delete' in args:
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action = 'end'
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del args['delete']
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del touches[touch.id]
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touches_sent.remove(tid)
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touch.update_time_end()
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queue.append((action, touch))
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def normalize(value, vmin, vmax):
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try:
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return (value - vmin) / float(vmax - vmin)
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except ZeroDivisionError: # it's both in py2 and py3
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return (value - vmin)
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# open mtdev device
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_fn = input_fn
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_slot = 0
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try:
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_device = Device(_fn)
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except OSError as e:
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if e.errno == 13: # Permission denied
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Logger.warn(
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'MTD: Unable to open device "{0}". Please ensure you'
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' have the appropriate permissions.'.format(_fn))
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return
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else:
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raise
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_changes = set()
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# prepare some vars to get limit of some component
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ab = _device.get_abs(MTDEV_ABS_POSITION_X)
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range_min_position_x = drs('min_position_x', ab.minimum)
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range_max_position_x = drs('max_position_x', ab.maximum)
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Logger.info('MTD: <%s> range position X is %d - %d' %
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(_fn, range_min_position_x, range_max_position_x))
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ab = _device.get_abs(MTDEV_ABS_POSITION_Y)
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range_min_position_y = drs('min_position_y', ab.minimum)
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range_max_position_y = drs('max_position_y', ab.maximum)
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Logger.info('MTD: <%s> range position Y is %d - %d' %
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(_fn, range_min_position_y, range_max_position_y))
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ab = _device.get_abs(MTDEV_ABS_TOUCH_MAJOR)
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range_min_major = drs('min_touch_major', ab.minimum)
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range_max_major = drs('max_touch_major', ab.maximum)
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Logger.info('MTD: <%s> range touch major is %d - %d' %
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(_fn, range_min_major, range_max_major))
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ab = _device.get_abs(MTDEV_ABS_TOUCH_MINOR)
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range_min_minor = drs('min_touch_minor', ab.minimum)
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range_max_minor = drs('max_touch_minor', ab.maximum)
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Logger.info('MTD: <%s> range touch minor is %d - %d' %
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(_fn, range_min_minor, range_max_minor))
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range_min_pressure = drs('min_pressure', 0)
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range_max_pressure = drs('max_pressure', 255)
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Logger.info('MTD: <%s> range pressure is %d - %d' %
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(_fn, range_min_pressure, range_max_pressure))
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invert_x = int(bool(drs('invert_x', 0)))
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invert_y = int(bool(drs('invert_y', 0)))
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Logger.info('MTD: <%s> axes invertion: X is %d, Y is %d' %
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(_fn, invert_x, invert_y))
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rotation = drs('rotation', 0)
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Logger.info('MTD: <%s> rotation set to %d' %
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(_fn, rotation))
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failures = 0
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while _device:
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# if device have disconnected lets try to connect
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if failures > 1000:
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Logger.info('MTD: <%s> input device disconnected' % _fn)
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while not os.path.exists(_fn):
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time.sleep(0.05)
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# input device is back online let's recreate device
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_device.close()
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_device = Device(_fn)
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Logger.info('MTD: <%s> input device reconnected' % _fn)
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failures = 0
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continue
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# idle as much as we can.
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while _device.idle(1000):
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continue
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# got data, read all without redoing idle
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while True:
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data = _device.get()
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if data is None:
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failures += 1
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break
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failures = 0
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# set the working slot
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if data.type == MTDEV_TYPE_EV_ABS and \
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data.code == MTDEV_CODE_SLOT:
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_slot = data.value
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continue
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# fill the slot
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if not (_slot in l_points):
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l_points[_slot] = dict()
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point = l_points[_slot]
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ev_value = data.value
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ev_code = data.code
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if ev_code == MTDEV_CODE_POSITION_X:
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val = normalize(ev_value,
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range_min_position_x,
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range_max_position_x)
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assign_coord(point, val, invert_x, 'xy')
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elif ev_code == MTDEV_CODE_POSITION_Y:
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val = 1. - normalize(ev_value,
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range_min_position_y,
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range_max_position_y)
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assign_coord(point, val, invert_y, 'yx')
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elif ev_code == MTDEV_CODE_PRESSURE:
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point['pressure'] = normalize(ev_value,
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range_min_pressure,
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range_max_pressure)
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elif ev_code == MTDEV_CODE_TOUCH_MAJOR:
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point['size_w'] = normalize(ev_value,
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range_min_major,
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range_max_major)
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elif ev_code == MTDEV_CODE_TOUCH_MINOR:
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point['size_h'] = normalize(ev_value,
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range_min_minor,
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range_max_minor)
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elif ev_code == MTDEV_CODE_TRACKING_ID:
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if ev_value == -1:
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point['delete'] = True
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# force process of changes here, as the slot can be
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# reused.
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_changes.add(_slot)
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process([l_points[x] for x in _changes])
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_changes.clear()
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continue
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else:
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point['id'] = ev_value
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else:
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# unrecognized command, ignore.
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continue
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_changes.add(_slot)
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# push all changes
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if _changes:
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process([l_points[x] for x in _changes])
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_changes.clear()
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def update(self, dispatch_fn):
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# dispatch all event from threads
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try:
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while True:
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event_type, touch = self.queue.popleft()
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dispatch_fn(event_type, touch)
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except:
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pass
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MotionEventFactory.register('mtdev', MTDMotionEventProvider)
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