Osmo Maatta wrote:
Hello,
I have a small application that has a search-field (gtk.ComboBoxEntry)
and a button to start a search job.
The application will start a new search if user:
1) Selects an item from the gtk.ComboBoxEntry's drop-down list.
This is handled by gtk.ComboBoxEntry's "changed" event. This is Ok.
2 Types a search query (some text) and presses the [Start search] button.
This is handled by the button's "clicked" event. This is Ok.
3) Presses the [Enter]-key.
This is handled by the combo's "activate" event attached to the
gtk.Entry. This is Ok.
Because a search-job can take quite a long time, I do not want to
activate search for each keystroke, when user types text in the search
field. And this is my problem. Key-strokes activate the "changed" event
on the gtk.ComboBoxEntry field. I cannot distinguish between the
drop-down list's "changed" event (which I want) and the "changed" event
when user types text (I try to avoid this event).
User is welcome to type in some text/query and press the [Start search]
button. This is OK.
So how to avoid "changed" event on each keystroke?
A simplified but complete example: http://www.futuredesktop.com/tmp/w4.py
Happy Easter,
Moma Antero
Grønland
I couldn't find a direct way of handling the problem..
But how about a timeout that only occurs after the user stops typing
for a while (e.g. 1/2 a second). It stops the search being triggered
for every keystroke.
# -*- coding: utf-8 -*-
import sys
import gtk
import gobject
class TestWindow(gtk.Window):
__gtype_name__ = "TestWindow"
def __init__(self, *args):
gtk.Window.__init__(self, *args)
self.timeout = None
self.set_default_size(300, 200)
vbox = gtk.VBox()
self.add(vbox)
hbox = gtk.HBox()
vbox.pack_start(hbox, expand=False, fill=False, padding=0)
combo = gtk.combo_box_entry_new_text()
#combo.connect("key-press-event", self.combo_key_press_event)
#combo.connect("key-release-event", self.combo_key_press_event)
#combo.connect("changed", self.combo_selection_changed)
combo.connect("changed", self.combo_timeout)
hbox.pack_start(combo, expand=False, fill=False, padding=0)
# Add some items
for i in range(6):
combo.append_text("Item %d" % (i,))
# Text input field (gtk.Entry object)
entry = combo.get_children()[0]
# Activate called on Enter-key
entry.connect("activate", self.entry_activate_event, combo)
button = gtk.Button("Start search")
button.connect("clicked", self.start_search_cb, combo)
hbox.pack_start(button, expand=False, fill=False, padding=0)
self.show_all()
def entry_activate_event(self, widget, user_data):
combo = user_data
txt = combo.get_active_text()
print "You pressed enter:", txt
return True
def combo_timeout(self, widget):
if self.timeout :
gobject.source_remove(self.timeout) # remove old timeout
self.timeout = gobject.timeout_add(500, self.combo_selection_changed, widget) # add a new one
def combo_selection_changed(self, widget):
txt = widget.get_active_text()
print "Selection changed:", txt
return False # cancal the timeout
def start_search_cb(self, widget, user_data):
combo = user_data
txt = combo.get_active_text()
print "Start search for:", txt
if __name__ == "__main__":
window = TestWindow()
window.show()
gtk.main()
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