cursor.c

   1 #include <gtk/gtk.h>
   2 #include "geevi.h"
   3
   4 #define CURSOR_MARK             "geevi_cursor"
   5 #define CURSOR_TAG              "geevi_tag"
   6
   7 void cursor_init(GtkTextView *view)
   8 {
   9         GtkTextBuffer *buffer = gtk_text_view_get_buffer(view);
  10         GtkTextIter iter;
  11         gtk_text_buffer_get_start_iter(buffer, &iter);
  12         gtk_text_buffer_create_mark(buffer, CURSOR_MARK, &iter, FALSE);
  13         gtk_text_buffer_create_tag(buffer, CURSOR_TAG,
  14                                    "background", "#000000",
  15                                    "foreground", "#FFFFFF", NULL);
  16         cursor_place(view, &iter);
  17 }
  18
  19 void cursor_redraw(GtkTextView *view)
  20 {
  21         GtkTextIter iter;
  22         cursor_get(view, &iter);
  23         cursor_place(view, &iter);
  24 }
  25
  26 void cursor_place(GtkTextView *view, GtkTextIter *iter)
  27 {
  28         GtkTextIter old_start, old_end;
  29         GtkTextIter end = *iter;
  30         GtkTextBuffer *buffer = gtk_text_view_get_buffer(view);
  31         GtkTextMark *mark = gtk_text_buffer_get_mark(buffer, CURSOR_MARK);
  32         cursor_get(view, &old_start);
  33         old_end = old_start;
  34         gtk_text_iter_forward_char(&old_end);
  35         gtk_text_buffer_remove_tag_by_name(buffer, CURSOR_TAG,
  36                                            &old_start, &old_end);
  37         if (gtk_text_iter_ends_line(iter)) {
  38                 /* cursor is hidden... do something! */
  39         }
  40         gtk_text_buffer_move_mark(buffer, mark, iter);
  41
  42         gtk_text_iter_forward_char(&end);
  43         gtk_text_buffer_apply_tag_by_name(buffer, CURSOR_TAG, iter, &end);
  44         gtk_text_buffer_place_cursor(buffer, iter);
  45         gtk_text_view_scroll_mark_onscreen(view, mark);
  46 }
  47
  48 void cursor_get(GtkTextView *view, GtkTextIter *iter)
  49 {
  50         GtkTextMark *mark;
  51         GtkTextBuffer *buffer = gtk_text_view_get_buffer(view);
  52         mark = gtk_text_buffer_get_mark(buffer, CURSOR_MARK);
  53         gtk_text_buffer_get_iter_at_mark(buffer, iter, mark);
  54 }