Re: No macro in gdkkeysyms.h seems to match the enter key.

[Kjell Ahlstedt <kjell ahlstedt bredband net>]

2012-05-04 15:02, Carlos Franke skrev:
> Hi!
>
>
> Short version:
>
> On my first try on handling keypress events with gtkmm, I am stuck 
> with a probably trivial problem: The GdkEventKey.keyval of hitting the 
> enter key does not seem to match any of the *Enter* or *Return* macros 
> in gdkkeysyms.h. GdkEventKey.keyval is supposed to be compared to the 
> values in gdkkeysyms.h, right? What is the right macro for the enter key?
>
>
> More details:
>
> If in a callback method I do thus:
>
> bool My_widget::my_callback(GdkEventKey* event)
> {
> std::cout << event->keyval << std::endl;
> std::cout << GDK_KEY_Return << std::endl;
> std::cout << GDK_KEY_KP_Enter << std::endl;
> std::cout << GDK_KEY_ISO_Enter << std::endl;
> std::cout << GDK_KEY_3270_Enter << std::endl;
> std::cout << GDK_KEY_RockerEnter << std::endl;
>
> return false;
> }
>
> … it shows that event->keyval is not matched by any of the macros I 
> tried. This is the output:
> 65515
> 65293
> 65421
> 65076
> 64798
> 269025061
>
> Did I miss the right macro for the enter key? If so, what is it? Is 
> there any documentation on the macros in gdkkeysyms.h, or do you have 
> to guess which macro to use for which key by their names?
>
>
> Carlos
Gtk+ uses GDK_KEY_Return, GDK_KEY_ISO_Enter and GDK_KEY_KP_Enter to test 
for the Enter key.

When I added a line to print out event->keyval in
http://git.gnome.org/browse/gtkmm-documentation/tree/examples/book/combobox/entry_text/examplewindow.cc
function ExampleWindow::on_entry_key_press_event(GdkEventKey* event), 
the result is
0xff0d = 65273 = GDK_KEY_Return.

Your result is 65515 = 0xffeb = GDK_KEY_Super_L.
On my PC GDK_KEY_Super_L is the left Windows key (the one with the 
Microsoft Windows symbol, looking like a flexible window).

I run Linux Ubuntu 12.04 on quite an old PC. What operating system do 
you use? An unusual type of keyboard?
Actually it's strange if gtk+/gtkmm programs work correctly, if your 
Enter key generates a key value that gtk+ does not recognize as an Enter 
key.

And no, I don't think there's any documentation of the macros in 
gdkkeysyms.h.

Kjell