Re: turn on italics in TextView

[Doug McCasland <dougm bravoecho net>]

Indeed, gtk_text_buffer_insert_with_tags_by_name() does what it says.  What
I was talking about was (in some future Textview) applying the tag to an
iter, then whenever the insert point was on that iter, it would inherit the
tag properties set there.  So typing at that point gets the formatting.

I don't have my code in front of me, but as I recall the jumpy-cursor thing
happened with this:

   1. Insert some text in a line.
   2. Apply indent 50px to whole line.  The line will be indented on the
   screen.
   3. Start typing at the beginning of line, which will not inherit the
   indent tag.  The indent will disappear on the screen.
   4. Move the cursor to the region with the applied indent -- the indent
   comes back.



On Tue, Aug 15, 2017 at 2:27 PM, <cecashon aol com> wrote:

> Have you tried gtk_text_buffer_insert_with_tags_by_name() to insert text
> with a tag at an iter?
>
> What tag combo do you use to get the cursor to bounce around? If I test
> having two indent tags on the same line, the first one applied wins out.
> This is what I tested with.
>
> Eric
>
>
> /*
>   gcc -Wall move_cursor1.c -o move_cursor1 `pkg-config --cflags --libs
> gtk+-3.0`
>   Tested on GTK3.18 and Ubuntu16.04
> */
>
> #include<gtk/gtk.h>
>
> static void get_style(GtkTextView *tv, GtkMovementStep step, gint count,
> gboolean extend, gpointer *user_data)
>   {
>     static int i=1;
>     GtkTextIter start;
>     GtkTextMark *mark;
>     GtkTextBuffer *buf;
>
>     buf=gtk_text_view_get_buffer(GTK_TEXT_VIEW(tv));
>
>     mark=gtk_text_buffer_get_insert(buf);
>     gtk_text_buffer_get_iter_at_mark (buf, &start, mark);
>     g_print("Iter %i\n", gtk_text_iter_get_offset(&start));
>
>     GSList *tlist=NULL;
>     GSList *p=NULL;
>     tlist=gtk_text_iter_get_tags(&start);
>     g_print("%i. List %p p %p\n", i, tlist, p);
>     i++;
>     for(p=tlist;p;p=p->next)
>       {
>         gchar *string=NULL;
>         g_object_get(G_OBJECT(p->data), "name", &string, NULL);
>         g_print("p %p %s\n", p, string);
>         g_free(string);
>       }
>
>     g_print("List %p\n", tlist);
>     if(tlist!=NULL) g_slist_free(tlist);
>   }
> int main (int argc, char *argv[])
>   {
>     gtk_init(&argc, &argv);
>
>     GtkWidget *window=gtk_window_new(GTK_WINDOW_TOPLEVEL);
>     gtk_window_set_title(GTK_WINDOW(window), "Move Cursor");
>     gtk_window_set_default_size(GTK_WINDOW(window), 300, 200);
>     gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
>     g_signal_connect(window, "destroy", G_CALLBACK(gtk_main_quit), NULL);
>
>     GtkWidget *textview=gtk_text_view_new();
>     gtk_widget_set_vexpand(textview, TRUE);
>     gtk_widget_set_hexpand(textview, TRUE);
>     g_signal_connect(textview, "move-cursor", G_CALLBACK(get_style), NULL);
>
>     GtkTextBuffer *buffer=gtk_text_view_get_buffer(GTK_TEXT_VIEW(textview)
> );
>     gtk_text_buffer_create_tag(buffer, "ital", "style",
> PANGO_STYLE_ITALIC, NULL);
>     gtk_text_buffer_create_tag(buffer, "bold", "weight",
> PANGO_WEIGHT_BOLD, NULL);
>     gtk_text_buffer_create_tag(buffer, "uline", "underline",
> PANGO_UNDERLINE_SINGLE, NULL);
>     gtk_text_buffer_create_tag(buffer, "indent", "indent", 20, NULL);
>     gtk_text_buffer_create_tag(buffer, "indent2", "indent", 40, NULL);
>     gtk_text_buffer_create_tag(buffer, "left-margin", "left-margin", 20,
> NULL);
>     gtk_text_buffer_create_tag(buffer, "left-margin2", "left-margin", 40,
> NULL);
>
>     GtkTextIter iter;
>     gtk_text_buffer_get_start_iter(buffer, &iter);
>     gtk_text_buffer_insert_with_tags_by_name(buffer, &iter, "ital ", -1,
> "ital", NULL);
>     gtk_text_buffer_get_end_iter(buffer, &iter);
>     gtk_text_buffer_insert_with_tags_by_name(buffer, &iter, "bold ", -1,
> "bold", NULL);
>     gtk_text_buffer_get_end_iter(buffer, &iter);
>     //Check a newline for a tag.
>     gtk_text_buffer_insert_with_tags_by_name(buffer, &iter, "uline \n",
> -1, "uline", NULL);
>     gtk_text_buffer_get_end_iter(buffer, &iter);
>     gtk_text_buffer_insert_with_tags_by_name(buffer, &iter, "all\n", -1,
> "ital", "bold", "uline", NULL);
>     //Check indents in the same line.
>     gtk_text_buffer_get_end_iter(buffer, &iter);
>     gtk_text_buffer_insert_with_tags_by_name(buffer, &iter, "indent ",
> -1, "indent", NULL);
>     gtk_text_buffer_get_end_iter(buffer, &iter);
>     gtk_text_buffer_insert_with_tags_by_name(buffer, &iter, "indent2\n",
> -1, "indent2", NULL);
>     gtk_text_buffer_get_end_iter(buffer, &iter);
>     gtk_text_buffer_insert_with_tags_by_name(buffer, &iter, "indent2\n",
> -1, "indent2", NULL);
>     //Check left-margin in the same line.
>     gtk_text_buffer_get_end_iter(buffer, &iter);
>     gtk_text_buffer_insert_with_tags_by_name(buffer, &iter, "left-margin
> ", -1, "left-margin", NULL);
>     gtk_text_buffer_get_end_iter(buffer, &iter);
>     gtk_text_buffer_insert_with_tags_by_name(buffer, &iter,
> "left-margin2\n", -1, "left-margin2", NULL);
>     gtk_text_buffer_get_end_iter(buffer, &iter);
>     gtk_text_buffer_insert_with_tags_by_name(buffer, &iter,
> "left-margin2", -1, "left-margin2", NULL);
>
>     GtkWidget *grid=gtk_grid_new();
>     gtk_container_set_border_width(GTK_CONTAINER(grid), 8);
>     gtk_grid_attach(GTK_GRID(grid), textview, 0, 0, 1, 1);
>
>     gtk_container_add(GTK_CONTAINER(window), grid);
>
>     gtk_widget_show_all(window);
>
>     gtk_main();
>
>     return 0;
>   }




-- 
Doug McCasland   <dougm bravoecho net>