I have been trying to teach myself PyGTK. I decided
to create a little GUI with a scrollbar. Using the
scrollbar, I can select the temperature in degrees
Fahrenheit. By clicking on the Convert button, the
GUI displays the corresponding degrees Celsius.
I have made a lot of progress, but for some reason,
the thumb on the scrollbar will not move when I click
and drag it. I asked for help on the Python tutor
mailing list, but there are not a lot of PyGTK experts
on that list. I have looked over the docs and the
tutorial, too. Can someone help me out?
#!/usr/bin/python
import pygtk
pygtk.require('2.0')
import gtk
def convert_to_celsius(widget,data):
degC = (data - 32)/1.8
print "Degrees Celsius: %.2f" % degC
def scale_set_default_values(scale):
scale.set_update_policy(gtk.UPDATE_CONTINUOUS)
scale.set_digits(1)
scale.set_value_pos(gtk.POS_LEFT)
scale.set_draw_value(True)
scale.set_sensitive(True)
class Conversion_GUI:
def __init__(self):
self.window = gtk.Window(gtk.WINDOW_TOPLEVEL)
self.window.connect("destroy", lambda w:
gtk.main_quit())
self.window.set_title("Convert to Celsius")
self.window.set_default_size(200,240)
box1 = gtk.VBox(False, 0)
self.window.add(box1)
box2 = gtk.HBox(False, 10)
box2.set_border_width(10)
box1.pack_end(box2, True, True, 0)
box3 = gtk.HBox(False, 10)
box3.set_border_width(10)
box1.pack_end(box3, True, True, 0)
adj1 = gtk.Adjustment(32.0, 212.0, 32.0, 0.1, 1.0,
1.0)
self.vscale = gtk.VScale(adj1)
self.vscale.set_size_request(20, 300)
scale_set_default_values(self.vscale)
box1.pack_start(self.vscale, True, True, 0)
quit_button = gtk.Button("Quit")
quit_button.connect("clicked", lambda
w:gtk.main_quit())
convert_button = gtk.Button("Convert")
convert_button.connect("clicked",
convert_to_celsius, self.vscale.get_value())
box3.pack_start(convert_button, True, True, 0)
box2.pack_start(quit_button, True, True, 0)
self.vscale.show()
convert_button.show()
quit_button.show()
box3.show()
box2.show()
box1.show()
self.window.show()
def main(self):
gtk.main()
return 0
if __name__ == '__main__':
convert = Conversion_GUI()
convert.main()
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