Re: How do I intercept keys in a Gtk::Entry widget?

[Murray Cumming <murrayc murrayc com>]

On Thu, 2008-09-25 at 08:58 -0700, Garth's KidStuff wrote:
> Hey All,
>
> I'd like to process the right arrow key in a Gtk::Entry widget (so, for
> instance, if the cursor is at the rightmost insert position, I'd like to do
> something special) but if I connect to the signal keypress event as so:
>
> // LXWidgetEntry inherits from Gtk::Entry
> LXWidgetEntry::LXWidgetEntry()
> {
>     signal_key_press_event().connect(sigc::mem_fun(*this,
> &LXWidgetEntry::OnKeypress));
> }
>
> bool LXWidgetEntry::OnKeypress(
>     GdkEventKey* event) // [in] event from the system (with key, state,
> etc.)
> {
>     if (event->keyval == GDK_Right)
>     {  // Do my thing here
>
>     }
>     return false;
> }
>
> I never get the right arrow key (I can get other keys, such as Tab, but not
> keys the entry control uses).

You probably just need to handle the signal before the base
implementation (the GTK+ widget) does:
http://www.gtkmm.org/docs/gtkmm-2.4/docs/tutorial/html/sec-xeventsignals.html#signal-handler-sequence

> Once I get the key, how do I either let the widget continue to handle the
> key in some of the cases?

That same section describes how you can use the return value to specify
that:
http://www.gtkmm.org/docs/gtkmm-2.4/docs/tutorial/html/sec-xeventsignals.html

-- 
Murray Cumming
murrayc murrayc com
www.murrayc.com
www.openismus.com