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