Nette\ComponentModel\Component::refreshMonitors PHP Method

    private function refreshMonitors($depth, &$missing = NULL, &$listeners = [])
    {
        if ($this instanceof IContainer) {
            foreach ($this->getComponents() as $component) {
                if ($component instanceof self) {
                    $component->refreshMonitors($depth + 1, $missing, $listeners);
                }
            }
        }
        if ($missing === NULL) {
            // detaching
            foreach ($this->monitors as $type => $rec) {
                if (isset($rec[1]) && $rec[1] > $depth) {
                    if ($rec[3]) {
                        // monitored
                        $this->monitors[$type] = [NULL, NULL, NULL, TRUE];
                        $listeners[] = [$this, $rec[0]];
                    } else {
                        // not monitored, just randomly cached
                        unset($this->monitors[$type]);
                    }
                }
            }
        } else {
            // attaching
            foreach ($this->monitors as $type => $rec) {
                if (isset($rec[0])) {
                    // is in cache yet
                    continue;
                } elseif (!$rec[3]) {
                    // not monitored, just randomly cached
                    unset($this->monitors[$type]);
                } elseif (isset($missing[$type])) {
                    // known from previous lookup
                    $this->monitors[$type] = [NULL, NULL, NULL, TRUE];
                } else {
                    $this->monitors[$type] = NULL;
                    // forces re-lookup
                    if ($obj = $this->lookup($type, FALSE)) {
                        $listeners[] = [$this, $obj];
                    } else {
                        $missing[$type] = TRUE;
                    }
                    $this->monitors[$type][3] = TRUE;
                    // mark as monitored
                }
            }
        }
        if ($depth === 0) {
            // call listeners
            $method = $missing === NULL ? 'detached' : 'attached';
            $prev = [];
            foreach ($listeners as $item) {
                if (!in_array($item, $prev, TRUE)) {
                    $item[0]->{$method}($item[1]);
                    $prev[] = $item;
                }
            }
        }
    }