Re: is there a signal for typing at bottom of window?

[Joël Krähemann <jkraehemann gmail com>]

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 <dougm 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 <cecashon 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 <dougm bravoecho net>
> > To: cecashon <cecashon 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 <dougm 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 <cecashon 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   <dougm bravoecho net>
> >
> >
> >
> > --
> > Doug McCasland   <dougm bravoecho net>
>
>
> --
> Doug McCasland   <dougm bravoecho net>
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