print cursor position in textbuffer

v923z · **Posted:** Tue Oct 25, 2011 9:05 pm

Hi All,

I would like to write a primitive text editor, and I would like to print out the position of the cursor. I connected the "changed" signal emitted by the textbuffer to a callback function. This works, as long as the textbuffer actually changes, but fails, if I use e.g., the left or right arrows (i.e., non-printable characters). My question is, how is one supposed to catch cases like this?
Thanks,
Zoltán

Paul Childs · **Posted:** Thu Oct 27, 2011 4:19 am

Try to connect to either to a signal indicating a change in the widget that the text is displayed in, e.g. in gtk3 there's the "draw" signal of gtk_widget class. If all else fails there's always the "notify" signal for the g_object class.

v923z · **Posted:** Thu Oct 27, 2011 10:42 am

Thanks, I will try that.
Cheers,
Zoltán

abhijangda · **Joined:** Sun Apr 03, 2011 11:12 am **Posts:** 63

Connect the key-press-event singnal. That has done the work for me.

errol · **Posted:** Fri Oct 28, 2011 7:54 pm

Connecting to the "key-press-event" signal will again not work for all cases. There could be times when the cursor position is changed by a mouse click, a touch sensitive screen or even by the programme.

The best by of of being notified of a potential change of cursor position is to connect a notify signal to the "cursor-position" property of the GtkTextBuffer, so that when the property is updated we will get a call back.

Below is a rough section of code that should do this.

Code:

g_signal_connect (buffer, "notify::cursor-position",
                  G_CALLBACK (gtk_text_view_notify_cursor_position),
                  view);

/*callback method*/
void
gtk_text_view_notify_cursor_position(GtkTextBuffer *buffer, GParamSpec *pspec,gpointer user_data)
{
 /*calculate cursor position using insert mark*/
 ....
}

E.

GTK+ Forums

print cursor position in textbuffer

Who is online