dorne/cursetree/cursetree.c

#include <stdlib.h>

#include "ncrswrap.h"
#include "node.h"
#include "tree.h"
#include "_ncurses.h"

int ct_init(struct ct_tree **const tree) {
  /* Initialise NCurses Library & Root Node */
  init_ncurses();
  init_tree(tree);

  return EXIT_SUCCESS;
}

/* Recursively search the tree for update requests.
 */
static void __update_rec(struct ct_node *const node) {
  if (node->flags & NFLAG_RESIZE) {
    /* TODO: the child has requested a resizing, but resize_node()
     * TODO: wastes CPU time resizing itself!
     */
    resize_node(node, dup_dims(node->surface->dims));
  }
  for (int i=0; i < node->cindex; i++) {
    __update_rec(node->child[i]);
  }
}

void ct_update(struct ct_tree *const tree) {
  const int key = wgetch(curscr);

  /* ncurses binds a SIGWINCH handler if SIGWINCH has SIG_DFL disposition
   * when initscr(3x) is called. This handler emits KEY_RESIZE (decimal 410) to stdin.
   * REF: manpages -> resizeterm(3x) initscr(3x) wgetch(3x)
   */
  switch (key) {
  case -1:
    wclear(tree->root->surface->win);
    mvwprintw(tree->root->surface->win, 0, 0, "    \r-1\n");
    wrefresh(tree->root->surface->win);
    return;
  case KEY_RESIZE:
    resize_tree(tree, termdims());
    // flush ncurses virtual screen -> physical screen
    doupdate();
    break;
  default:
    // wclear(tree->root->surface->win);
    mvwprintw(tree->root->surface->win, 0, 0, "    \r%d\n", key);
    wrefresh(tree->root->surface->win);
    break;
  }

  __update_rec(tree->root);
}