Re: [gtkmm] signal_key_press_event() question

["Daniel J. Lauk" <Daniel Lauk Student FH-Reutlingen de>]

Hi.

First of all, I think, that your Gdk event handler is not doing all it should,
but I'm not sure.
Anyway, what you'd probably like is, to have the same behaviour as with a regular
Gtk::Entry except for the thing with the <ENTER> to <TAB> conversion, right?

I'm not absolutely sure on this, but you might like to experiment with the following
code:

<code>
bool NumberEntry::on_key_press_event(GdkEventKey* event)
{
  /* first (if necessary) change the key code */
  //36 = enter, 108 = keypad enter, 13 = tab
  if (event->hardware_keycode==36 ||
      event->hardware_keycode==108)
  {
    event->hardware_keycode = 13;
  }
  
  /* and now do, what Gtk::Entry would have done */
  return Gtk::Entry::on_key_press_event(event);
}
</code>

Best regards,

DJ

>I want to catch a keypress of enter and turn it into a tab (to go to the 
>next entry) to enable the user to quickly enter lots of numbers with the 
>numerical keypad.
>
>Then i tried this code to catch a keypress in a Gtk::Entry, but this only 

>works with non-printable keys (tab, function keys etc.)
>So i think that all printable characters get processed by the entry's 
>on_key_press_event() and never make it to OnKeyPress() ?.
>
>class NumberEntry : public Gtk::Entry
>{	public:
>		NumberEntry();
>		 ~NumberEntry();
>		bool OnKeyPress(GdkEventKey* event);
>};
>
>NumberEntry::NumberEntry()
>{	signal_key_press_event().connect(sigc::mem_fun(*this, 
>&NumberEntry::OnKeyPress));
>}
>
>bool NumberEntry::OnKeyPress(GdkEventKey* event)
>{	cout << "Pressed " << event->hardware_keycode << endl;
>	return false;
>}
>
>
>I also tried overriding the on_key_press_event() function and was able to 

>turn an enter into a tab, however no printable characters made it into the

>entry box.
>
>bool NumberEntry::on_key_press_event(GdkEventKey* event)
>{	cout << "Pressed " << event->hardware_keycode << endl;
>	//36 = enter, 108 = keypad enter, 13 = tab
>	if (event->hardware_keycode==36 || event->hardware_keycode==108)
>	{	event->hardware_keycode = 23;
>		return on_key_press_event(event); //tab to next
>	}
>	return false;
>}
>
>i'm kinda stuck now, what am i doing wrong?, or is there maybe a much 
>simpler way to achieve what i want?
>
>thanks for any help,
>Marco