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# Copyright (C) 2012 One Laptop Per Child
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
import logging
from gi.repository import Gdk
from gi.repository import SugarExt
_instance = None
def setup():
'''Cursor tracker: only display the cursor in mouse/trackpad mode
We only display the cursor in mouse/trackpad mode, hence when
a mouse motion is detected or a button press event. When a
touch begin event is received the cursor will be hidden.
We only track the incoming events when a touchscreen device
is available.
'''
global _instance
if _instance:
del _instance
display = Gdk.Display.get_default()
device_manager = display.get_device_manager()
devices = device_manager.list_devices(Gdk.DeviceType.SLAVE)
for device in devices:
if device.get_source() == Gdk.InputSource.TOUCHSCREEN:
logging.debug('Cursor Tracker: found touchscreen, ' \
'will track input.')
_instance = SugarExt.CursorTracker()
break
if not _instance:
logging.debug('Cursor Tracker: no touchscreen available, ' \
'will not track input.')
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