Ticket #4075: zoom_scaled_changed.py

#!/usr/bin/env python

import math

from gi.repository import Gtk
from gi.repository import Gdk
from gi.repository import SugarGestures


class TestTouch(Gtk.DrawingArea):

    def __init__(self):
        super(TestTouch, self).__init__()

        self.set_events(Gdk.EventMask.TOUCH_MASK)
        self.connect('draw', self.__draw_cb)

        self.touch = None

        zoom = SugarGestures.ZoomController()
        zoom.connect('scale-changed', self.__scale_changed_cb)
        zoom.attach(self, SugarGestures.EventControllerFlags.NONE)

    def __scale_changed_cb(self, controller, scale):
        print 'Scale:', scale
        if scale == 1.0:
            self.touch = (500, 250)
        else:
            self.touch = None
        self.queue_draw()

    def __draw_cb(self, widget, ctx):
        ctx.set_source_rgba(1, 0, 0, 0.7)
        if self.touch is not None:
            x, y = self.touch
            ctx.save()
            ctx.arc(x, y, 60, 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.set_size_request(1000, 500)
    Gtk.main()

if __name__ == "__main__":
    main()