Hi again,
For sure you should probably use:
g_signal_connect_after(your_text_buffer, "changed",
G_CALLBACK(your_text_buffer_changed_callback), your_data);
and YOUR_DATA(your_data) just casts to your pointer to a struct or
object containing some information:
struct _YourData{
gint last_newline_position;
};
Well this is it.
Bests,
Joël
On Wed, Sep 26, 2018 at 7:12 AM Joël Krähemann <jkraehem...@gmail.com> wrote:
>
> Hi,
>
> g_object_get(your_text_view,
> "buffer", &your_text_buffer,
> NULL);
> g_signal_connect(your_text_buffer, "changed",
> G_CALLBACK(your_text_buffer_changed_callback), your_data);
>
> void your_text_buffer_changed_callback(GtkTextBuffer
> *your_text_buffer, gpointer your_data)
> {
> gint line_count;
>
> line_count = gtk_text_buffer_get_line_count(your_text_buffer);
>
> if(line_count > YOUR_DATA(your_data)->line_count){
> gchar *your_text;
>
> g_object_get(your_text_buffer,
> "text", &your_text,
> NULL);
>
> if(your_text[strlen(your_text) - 1] == '\n' &&
> YOUR_DATA(your_data)->last_newline_position <
> &(your_text[strlen(your_text) - 1]) - your_text){
> //TODO:DMC: implement me
> }
> }
> }
>
> by,
> Joël
>
> On Wed, Sep 26, 2018 at 6:49 AM Doug McCasland <do...@bravoecho.net> wrote:
> >
> > Eric, thanks for the ideas!
> >
> > I tried a bunch of things to distinguish the callbacks, but it got too
> > complicated. Checking for a different line number is a clever idea, but
> > PgUp and PgDown also move the cursor which changes the line number.
> > Similar problems for tracking the char offset in the line (for simply
> > typing at the end of the last visible line, not creating a new line/para).
> >
> > So, it would be nice if there was a simple signal for this case, where the
> > window scrolls because of keyboard input in the last visible line.
> >
> > The reason I want this is, is so my app can scroll the window
> > automatically, so that the cursor insert point becomes centered
> > vertically. In other words, when I'm typing a long paragraph, and it's the
> > last visible line, I want it to scroll up, so I'm now typing in the middle
> > of the window (vs. continuing to type on the last visible line).
> >
> > I suppose this is a bit esoteric.
> >
> > I did create a kbd shortcut to do that scroll manually:
> >
> > gtk_text_view_scroll_to_iter(..., 0.0, TRUE, 1.0, 0.5)
> >
> > so I have that to use.
> >
> >
> > On Tue, Sep 25, 2018 at 2:34 PM <cecas...@aol.com> wrote:
> >
> > >
> > > Not sure how to go about this myself. I see the extra callbacks and it
> > > would be a good thing to limit them. For filtering maybe check if the
> > > cursor has changed lines along with the adjustment value change. Suspect
> > > there is a better solution for this.
> > >
> > > static void value_changed(GtkAdjustment *v_adjust, gpointer textview)
> > > {
> > > static gint s_line=0;
> > > GtkTextIter iter;
> > > GtkTextBuffer
> > > *buffer=gtk_text_view_get_buffer(GTK_TEXT_VIEW(textview));
> > > GtkTextMark *mark=gtk_text_buffer_get_mark(buffer, "insert");
> > > gtk_text_buffer_get_iter_at_mark(buffer, &iter, mark);
> > > gint line=gtk_text_iter_get_line(&iter);
> > > if(s_line!=line)
> > > {
> > > g_print("Scroll Line\n");
> > > s_line=line;
> > > }
> > > }
> > >
> > > Eric
> > >
> > >
> > > -----Original Message-----
> > > From: Doug McCasland <do...@bravoecho.net>
> > > To: cecashon <cecas...@aol.com>
> > > Sent: Tue, Sep 25, 2018 2:10 pm
> > > Subject: Re: is there a signal for typing at bottom of window?
> > >
> > > Actually I get 11 signals with a different setting of:
> > > gtk_text_view_set_pixels_inside_wrap()
> > >
> > > So it's one signal per vertical pixel perhaps? I can code for that.
> > >
> > > But I also I get those signals during any scrolling (scrollbar or
> > > mousewheel). How can I distinguish between automatic scrolling at bottom
> > > and user-commanded scrolling?
> > >
> > > thanks
> > >
> > >
> > >
> > >
> > >
> > > On Tue, Sep 25, 2018 at 1:47 PM Doug McCasland <do...@bravoecho.net>
> > > wrote:
> > >
> > > Woo-hoo, that works!
> > >
> > > BUT, I get 12 signals for each line that is auto-scrolled. I can code for
> > > this, but why 12? Will it always be 12?
> > >
> > >
> > > On Tue, Sep 25, 2018 at 11:46 AM <cecas...@aol.com> wrote:
> > >
> > >
> > > Hi Doug,
> > >
> > > Try getting the vertical adjustment of the scrolled window and connect to
> > > "value-changed". See if that will work. Something like
> > >
> > > ...
> > > static void value_changed(GtkAdjustment *v_adjust, gpointer user_data)
> > > {
> > > }
> > > ...
> > > GtkWidget *scroll=gtk_scrolled_window_new(NULL, NULL);
> > > GtkAdjustment
> > > *v_adjust=gtk_scrolled_window_get_vadjustment(GTK_SCROLLED_WINDOW(scroll));
> > > g_signal_connect(v_adjust, "value-changed", G_CALLBACK(value_changed),
> > > NULL);
> > > ...
> > >
> > > Eric
> > >
> > >
> > >
> > >
> > >
> > > --
> > > Doug McCasland <do...@bravoecho.net>
> > >
> > >
> > >
> > > --
> > > Doug McCasland <do...@bravoecho.net>
> > >
> >
> >
> > --
> > Doug McCasland <do...@bravoecho.net>
> > _______________________________________________
> > gtk-app-devel-list mailing list
> > gtk-app-devel-list@gnome.org
> > https://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
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