I'm still working the entry box validation, and for now I'm trying to
stick with the approach of intercepting the insert-text signal. I've
added a call where the entry box emits a 'move-cursor' signal, and still
no luck. The sample C code in the GTK documentation doesn't indicate
that anything more than handling the 'insert-text' signal is needed, and
some of the examples I've found from Google also do nothing more than
handle 'insert-text'. Can anyone point out just what I'm missing to make
the entry box cursor move to the end of the text?
The code below now accepts the '-' and '+' characters. If they are the
only characters in the entry when a 'focus-out' signal is handled then
the entry box is cleared. I'm still not sure of a good way to test for
these characters yet, but at least now negative numbers can be added in
the entry box.
Art Haas
=================================================
#!/usr/bin/python
#
# entry box validation test
#
import gtk
import sys
def entry_activate(entry):
print "in entry_activate() ..."
_text = entry.get_chars(0, -1)
sys.stdout.write("text: '%s'\n" % _text)
entry.delete_text(0, -1)
def entry_changed(entry):
print "in entry_changed() ..."
_text = entry.get_chars(0, -1)
sys.stdout.write("text: '%s'\n" % _text)
def entry_key_press(entry, event):
print "in entry_key_press() ..."
return gtk.FALSE
def entry_key_release(entry, event):
print "in entry_key_release() ..."
return gtk.FALSE
def entry_focus_in(entry, event):
print "in entry_focus_in() ..."
return gtk.FALSE
def entry_focus_out(entry, event):
print "in entry_focus_out() ..."
_text = entry.get_chars(0, -1)
if _text == '-' or _text == '+':
entry.delete_text(0, -1)
return gtk.FALSE
def entry_move_cursor(entry, step, arg1, arg2):
print "in entry_move_cursor() ..."
print "step: %d" % step
print "count: %d" % arg1
print "ext. sel: %d" % arg2
def entry_insert_text(entry, new_text, new_text_length, position):
print "in entry_insert_text() ..."
sys.stdout.write("new_text: '%s'\n" % new_text)
print "position: " + `position`
if (new_text.isdigit() or
new_text == '.' or
new_text == '+' or
new_text == '-'):
sys.stdout.write("good character: '%s'\n" % new_text)
_string = entry.get_chars(0, -1) + new_text
sys.stdout.write("string: '%s'\n" % _string)
_hid = entry.get_data('handlerid')
entry.handler_block(_hid)
entry.set_position(-1)
_pos = entry.get_position()
print "pos: %d" % _pos
# _pcp = entry.get_property("cursor-position")
# print "property cursor position: %d" % _pcp
_move = True
if _string == '-' or _string == '+':
_pos = entry.insert_text(new_text, _pos)
else:
try:
sys.stdout.write("trying string ...\n")
_val = float(_string)
_pos = entry.insert_text(new_text, _pos)
print "pos: %d" % _pos
except StandardError, e:
_move = False
sys.stdout.write("exception: '%s'\n" % e)
entry.handler_unblock(_hid)
# _pcp = entry.get_property("cursor-position")
# print "property cursor position: %d" % _pcp
# if _move:
# entry.emit("move_cursor", gtk.MOVEMENT_VISUAL_POSITIONS,
# len(new_text), gtk.FALSE)
entry.set_position(-1)
entry.stop_emission("insert-text")
def main():
_window = gtk.Window()
_window.set_title("Entry box validation.")
_window.set_border_width(10)
_window.connect('destroy', lambda win: gtk.main_quit())
_hbox = gtk.HBox(gtk.FALSE, 10)
_window.add(_hbox)
_label = gtk.Label("Enter a number:")
_hbox.pack_start(_label, gtk.FALSE, gtk.FALSE, 0)
_entry = gtk.Entry()
_entry.connect("activate", entry_activate)
_entry.connect("move_cursor", entry_move_cursor)
# _entry.connect("key_press_event", entry_key_press)
# _entry.connect("key_release_event", entry_key_release)
# _entry.connect("focus_in_event", entry_focus_in)
_entry.connect("focus_out_event", entry_focus_out)
# _entry.connect("changed", entry_changed)
_handlerid = _entry.connect("insert-text", entry_insert_text)
_entry.set_data('handlerid', _handlerid)
print "handlerid: %d" % _handlerid
_hbox.pack_start(_entry, gtk.TRUE, gtk.TRUE, 0)
_window.show_all()
gtk.main()
if __name__ == '__main__':
main()
====================================================
--
Man once surrendering his reason, has no remaining guard against absurdities
the most monstrous, and like a ship without rudder, is the sport of every wind.
-Thomas Jefferson to James Smith, 1822
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