Hi Ken,
The cursor value which your code is calculating from insert mark is getting
updated in button-release-event. So the syntax tokens can be identified in
button-release-event callback.
You can even try using below method to find the cursor position in
button-press-event itself.
1. Convert the x,y coordinates received in the button-press-event to buffer
coordindates.
2. Calculate the GtkTextIter from the buffer coordinates.
eg :
/* Button press callback */
{
gtk_text_view_window_to_buffer_coords(text_view,
gtk_text_view_get_window_type (GTK_TEXT_VIEW(text_view),
event->window),event->x, event->y, &x, &y);
gtk_text_view_get_iter_at_location (GTK_TEXT_VIEW (text_view), &curr, x,
y);
/* Identify if curr iter is associated with syntax token tag array */
...
...
}
regards ,
Sanny
On Sun, Feb 28, 2010 at 5:23 PM, Ken Resander <[email protected]> wrote:
> 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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