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#!/usr/bin/env python
# Copyright (C) 2011, One Laptop Per Child
# Author, Gonzalo Odiard <gonzalo@laptop.org>
# Translated from c demo provided by Carlos Garnacho <carlos@lanedo.com>
from gi.repository import Gtk
from gi.repository import Gdk
import math
import logging
class TestTouch(Gtk.DrawingArea):
def __init__(self):
self.touches = {}
super(TestTouch, self).__init__()
self.set_events(Gdk.EventMask.TOUCH_MASK)
self.add_events(Gdk.EventMask.BUTTON_PRESS_MASK)
self.add_events(Gdk.EventMask.BUTTON_RELEASE_MASK)
self.add_events(Gdk.EventMask.BUTTON_MOTION_MASK)
self.connect('draw', self.__draw_cb)
self.connect('event', self.__event_cb)
self._on_touch = False
def __event_cb(self, widget, event):
if event.type in (Gdk.EventType.TOUCH_BEGIN,
Gdk.EventType.TOUCH_CANCEL, Gdk.EventType.TOUCH_END,
Gdk.EventType.TOUCH_UPDATE, Gdk.EventType.BUTTON_PRESS,
Gdk.EventType.BUTTON_RELEASE, Gdk.EventType.MOTION_NOTIFY):
x = event.get_coords()[1]
y = event.get_coords()[2]
if event.type in (Gdk.EventType.BUTTON_PRESS,
Gdk.EventType.BUTTON_RELEASE, Gdk.EventType.MOTION_NOTIFY):
seq = 'mouse'
else:
seq = str(event.touch.sequence)
pressure = event.get_axis(Gdk.AxisUse.PRESSURE)[1]
if pressure == 0:
pressure = 1
# workaround: discard first motion notify because can be emulated
if event.type == Gdk.EventType.MOTION_NOTIFY and \
len(self.touches) == 0:
return
if event.type in (Gdk.EventType.TOUCH_BEGIN,
Gdk.EventType.TOUCH_UPDATE, Gdk.EventType.BUTTON_PRESS,
Gdk.EventType.MOTION_NOTIFY):
self.touches[seq] = (x, y, pressure)
self._on_touch = True
elif event.type in (Gdk.EventType.TOUCH_END,
Gdk.EventType.BUTTON_RELEASE):
del self.touches[seq]
self._on_touch = False
self.queue_draw()
def __draw_cb(self, widget, ctx):
ctx.set_source_rgba(0.3, 0.3, 0.3, 0.7)
for touch in self.touches.values():
x, y, pressure = touch
logging.error('x %s y %s pressure %s', x, y, pressure)
ctx.save()
ctx.arc(x, y, 60 * pressure, 0., 2 * math.pi)
ctx.fill()
ctx.restore()
def main():
window = Gtk.Window()
test_touch = TestTouch()
window.add(test_touch)
window.connect("destroy", Gtk.main_quit)
window.show_all()
window.maximize()
Gtk.main()
if __name__ == "__main__":
main()
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