[Uim] Focus and cursor position shift handlings (bug #7729)

[Etsushi Kato]

On 11/17/06, YAMAMOTO Kengo / YamaKen <yamaken at bp.iij4u.or.jp> wrote:
> At Fri, 17 Nov 2006 16:31:51 +0900,
> ek.kato at gmail.com wrote:
> > As GtkTextview doesn't inherit GtkEditable we can't use this.  Since
> > only GtkEntry and GtkTextView have GtkIMContext in GTK+, following
> > code should work (but seem hack).
>
> Oops, sorry. You're right. But I think that the responsibility
> violation of your code should be avoided even if it's a
> workaround hack. I prefer keeping im_context private to text
> widgets, as described in gtk_entry_init(). And I also want to
> keep full-implementability of user text widgets that use
> im_context possible.
>
> # Although I recently suggested a code fragment which touches
> # im_context directly to explain my concepts. Sorry, it was only
> # a concept and inappropriate for actual implementation.
>
> static void
> gtk_entry_init (GtkEntry *entry)
> {
>   ...
>   /* This object is completely private. No external entity can gain a reference
>    * to it; so we create it here and destroy it in finalize().
>    */
>   entry->im_context = gtk_im_multicontext_new ();
>   ...
> }

Agreed.

> How about using move_cursor signal with zero move to notify text
> widgets the event?

That's fine.  And it is needed to revise semantics of
gtk_text_view_reset_im_context() and _gtk_entry_reset_im_context().
It may requires additional interface with GtkIMContext.  Or just call
gtk_im_context_focus_out() and gtk_im_context_focus_in() sequentially
within it?


void
gtk_widget_fix_input_context (GtkWidget *widget)
{
  GtkWidget *toplevel, *focus_widget;;

  g_return_if_fail (GTK_IS_WIDGET (widget));

  toplevel = gtk_widget_get_toplevel (widget);

  if (GTK_WIDGET_TOPLEVEL (toplevel)) {
    focus_widget = GTK_WINDOW (toplevel)->focus_widget;
    if (focus_widget &&
        (GTK_IS_TEXT_VIEW (focus_widget) || GTK_IS_ENTRY (focus_widget)))
      g_signal_emit_by_name (focus_widget, "move_cursor",
                             GTK_MOVEMENT_LOGICAL_POSITIONS, 0, FALSE);
  }
}

-- 
Etsushi Kato
ek.kato at gmail.com