I am trying to do a bit of syntax highlighting. I am using
gtk_text_buffer_create_tag and gtk_text_buffer_insert_with_tags to
syntax-highlight the intial text (from file). That works fine.
The program needs to identify existing syntax tokens in order to do appropriate
syntax checking should the user decide to go back and amend them and I am
having problems with this.
Find a token-tag from current position:
[code]
static int findtagfromcursor ( GtkTextBuffer * buf )
{
GtkTextMark * mark = gtk_text_buffer_get_insert (buf);
GtkTextIter curiter ;
gtk_text_buffer_get_iter_at_mark (buf, &curiter, mark);
int k = 0 ;
while ( k < NUMTOKENS )
{
if ( gtk_text_iter_has_tag ( &curiter , tags [ k ] ) )
{
return k ;
}
k++ ;
}
return -1 ;
}
[/code]
The tags array is set by calls to gtk_text_buffer_create_tag when the text is
read in.
Initialisation:
[code]
GtkWidget * e = gtk_text_view_new ( ) ;
GtkTextBuffer * buf = gtk_text_view_get_buffer (GTK_TEXT_VIEW (e));
gtk_text_view_set_editable ( (GtkTextView *)e , true ) ;
g_signal_connect_after ( G_OBJECT (e) , "button-press-event" ,
G_CALLBACK (buttonpresscb) , buf ) ;
[/code]
Skeleton callback:
[code]
static gboolean buttonpresscb ( GtkWidget * w, GdkEventButton *event, char *
data )
{
GtkTextBuffer * buf = (GtkTextBuffer *)data ;
int tokenix = findtagfromcursor ( buf ) ;
if ( tokenix != -1 )
{
printf ( "MTOKEN %s(%d): \n" tokenlkup [ tokenix ] , tokenix ) ;
}
else
{
printf ( "MTOKEN %d: \n" , tokenix ) ;
}
return false;
}
[/code]
Textview text:
text text ... TOKEN2TEXT text text... TOKEN0TEXT text text ... TOKEN1TEXT
'text text...' is unadorned text.
TOKEN0TEXT, TOKEN1TEXT, TOKEN2TEXT ... are categories of text associated with
different visual attributes. The program identifies these with numbers 0,1,2
internally. When the user clicks on a token the program needs to identify the
token.
When I click TOKEN2TEXT the callback reports no-token (-1). Then when I click
TOKEN0TEXT it reports the TOKEN2TEXT (2) and when I click TOKEN1TEXT it reports
TOKEN0TEXT (0) and so on.
I thought this is because buttonpresscb is called before the text handler that
changes the current text position to the mouse-click position, so I changed the
connect call to g_signal_connect_after ( G_OBJECT (e) , "but... ).
That did not work. I received no buttonpress events at all.
Why? I am totally stuck, so would be most grateful for advice.
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