Hello,
On the application I'm currently working on [1], I want limit the size of the
text entered in a GtkTextBuffer to those saved in the DBMS, so 4096 chars.
I so connected to the 'changed' signal of the GtkTextBuffer, and the handler
is :
static void
on_notes_changed( GtkTextBuffer *buffer, void *empty )
{
static const gchar *thisfn = "my_utils_on_notes_changed";
static const gint MAX_LENGTH = 4096;
static gboolean in = FALSE;
gint count;
GtkTextIter start, end;
/* prevent an infinite recursion */
if( !in ){
count = gtk_text_buffer_get_char_count( buffer );
if( count >= MAX_LENGTH ){
/*
* this code works, but emit the following Gtk-Warning:
*
* Invalid text buffer iterator: either the iterator is
* uninitialized, or the characters/pixbufs/widgets in
the
* buffer have been modified since the iterator was
created.
* You must use marks, character numbers, or line
numbers to
* preserve a position across buffer modifications.
* You can apply tags and insert marks without
invalidating
* your iterators, but any mutation that affects
'indexable'
* buffer contents (contents that can be referred to by
character
* offset) will invalidate all outstanding iterators
*/
gtk_text_buffer_get_iter_at_offset( buffer, &start,
MAX_LENGTH-1 );
/*gtk_text_iter_backward_char( &start );*/
/*gtk_text_buffer_get_iter_at_offset( buffer, &end,
count );*/
gtk_text_buffer_get_end_iter( buffer, &end );
/*gtk_text_iter_backward_char( &end );*/
in = TRUE;
g_debug( "%s: count=%d, start=%d, end=%d",
thisfn, count,
gtk_text_iter_get_offset( &start ), gtk_text_iter_get_offset( &end ));
gtk_text_buffer_delete( buffer, &start, &end );
in = FALSE;
}
}
}
As stated in the comment, the code works (the size if actually limited to 4095
chars),
but each execution of gtk_text_buffer_delete() triggers the well-known warning
"Invalid text buffer iterator".
I am a bit stucked here, because I do not understand why this happens, as the
buffer
is not modified between taking the iters and deleting the content...
Can anyone help me in this matter ?
Thanks in advance.
Regards
Pierre
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