Blocking signal_changed() in Entry for real

[Yann Leydier <yann leydier info>]

Hi,

I'd like to create an auto-completion process with an Entry. As image 
processing is involved it's very impractical to use the Completion class.

So, I connect to the "changed" signal, set the new text and select the 
end of the text so that the user may continue to type and overwrite the 
auto-completion.

However, despite blocking the signal, the callback is called twice. It 
acts like the set_text() method is asynchronous. Is there a way to 
really block the "changed" signal till the Entry is really updated?

Thanks,
yann


Sample code:

Cell::Cell()
{
	on_text_changed_connection = 
signal_changed().connect(sigc::mem_fun(this, &Cell::on_text_changed));
}

void Cell::on_text_changed()
{
	on_text_changed_connection.block();
	std::cout << "blocked" << std::endl;

	int cursor = (int)get_text().size();
	set_text(call_to_custom_competion());
	set_position(cursor);
	select_region(cursor, (int)get_text().size());
	std::cout << "select from " << cursor << " to " << get_text().size() << 
std::endl;
	std::cout << "completed" << std::endl;

	on_text_changed_connection.unblock();
	std::cout << "unblocked" << std::endl;
}

Output when erasing the last character of a text of size 12:

blocked
select from 11 to 12
completed
unblocked
blocked
select from 12 to 12
completed
unblocked