element groups: initial support, improves login dialog init

src/ui/widget/button.c

@@ -0,0 +1,38 @@
+#include "button.h"
+#include <ncurses.h>
+#include <stdlib.h>
+#include <string.h>
+
+button_t *init_button() {
+  button_t *btn = malloc(sizeof(button_t));
+  btn->is_disabled = 0;
+  btn->is_focused = 0;
+  btn->is_hovered = 0;
+  btn->callback = NULL;
+  return btn;
+}
+
+int32_t draw_button(WINDOW *win, button_t *btn, uint32_t cur_x, uint32_t cur_y) {
+  char title[DIALOGUE_TITLE + 6];
+
+  if (btn->is_focused) {
+    sprintf(title, "[< %s >]", btn->w.title);
+  } else {
+    sprintf(title, "[ %s ]", btn->w.title);
+  }
+
+  if (btn->is_hovered) {
+    wattrset(win, COLOR_PAIR(1) | A_BOLD | A_REVERSE);
+  } else {
+    wattrset(win, COLOR_PAIR(1) | A_BOLD);
+  }
+
+  mvwprintw(win, cur_y, cur_x, "%s", title);
+
+  wattroff(win, A_REVERSE | A_BOLD);
+  return strlen(title);
+}
+
+void destroy_button(button_t *btn) {
+    free(btn);
+}