/** * Handle showing/processing the submission from the block editing form. * @return boolean true if the form was submitted and the new config saved. Does not * return if the editing form was displayed. False otherwise. */ public function process_url_move() { global $CFG, $DB, $PAGE; $blockid = optional_param('bui_moveid', null, PARAM_INT); if (!$blockid) { return false; } require_sesskey(); $block = $this->find_instance($blockid); if (!$this->page->user_can_edit_blocks()) { throw new moodle_exception('nopermissions', '', $this->page->url->out(), get_string('editblock')); } $newregion = optional_param('bui_newregion', '', PARAM_ALPHANUMEXT); $newweight = optional_param('bui_newweight', null, PARAM_FLOAT); if (!$newregion || is_null($newweight)) { // Don't have a valid target position yet, must be just starting the move. $this->movingblock = $blockid; $this->page->ensure_param_not_in_url('bui_moveid'); return false; } if (!$this->is_known_region($newregion)) { throw new moodle_exception('unknownblockregion', '', $this->page->url, $newregion); } // Move this block. This may involve moving other nearby blocks. $blocks = $this->birecordsbyregion[$newregion]; $maxweight = self::MAX_WEIGHT; $minweight = -self::MAX_WEIGHT; // Initialise the used weights and spareweights array with the default values $spareweights = array(); $usedweights = array(); for ($i = $minweight; $i <= $maxweight; $i++) { $spareweights[$i] = $i; $usedweights[$i] = array(); } // Check each block and sort out where we have used weights foreach ($blocks as $bi) { if ($bi->weight > $maxweight) { // If this statement is true then the blocks weight is more than the // current maximum. To ensure that we can get the best block position // we will initialise elements within the usedweights and spareweights // arrays between the blocks weight (which will then be the new max) and // the current max $parseweight = $bi->weight; while (!array_key_exists($parseweight, $usedweights)) { $usedweights[$parseweight] = array(); $spareweights[$parseweight] = $parseweight; $parseweight--; } $maxweight = $bi->weight; } else { if ($bi->weight < $minweight) { // As above except this time the blocks weight is LESS than the // the current minimum, so we will initialise the array from the // blocks weight (new minimum) to the current minimum $parseweight = $bi->weight; while (!array_key_exists($parseweight, $usedweights)) { $usedweights[$parseweight] = array(); $spareweights[$parseweight] = $parseweight; $parseweight++; } $minweight = $bi->weight; } } if ($bi->id != $block->instance->id) { unset($spareweights[$bi->weight]); $usedweights[$bi->weight][] = $bi->id; } } // First we find the nearest gap in the list of weights. $bestdistance = max(abs($newweight - self::MAX_WEIGHT), abs($newweight + self::MAX_WEIGHT)) + 1; $bestgap = null; foreach ($spareweights as $spareweight) { if (abs($newweight - $spareweight) < $bestdistance) { $bestdistance = abs($newweight - $spareweight); $bestgap = $spareweight; } } // If there is no gap, we have to go outside -self::MAX_WEIGHT .. self::MAX_WEIGHT. if (is_null($bestgap)) { $bestgap = self::MAX_WEIGHT + 1; while (!empty($usedweights[$bestgap])) { $bestgap++; } } // Now we know the gap we are aiming for, so move all the blocks along. if ($bestgap < $newweight) { $newweight = floor($newweight); for ($weight = $bestgap + 1; $weight <= $newweight; $weight++) { foreach ($usedweights[$weight] as $biid) { $this->reposition_block($biid, $newregion, $weight - 1); } } $this->reposition_block($block->instance->id, $newregion, $newweight); } else { $newweight = ceil($newweight); for ($weight = $bestgap - 1; $weight >= $newweight; $weight--) { if (array_key_exists($weight, $usedweights)) { foreach ($usedweights[$weight] as $biid) { $this->reposition_block($biid, $newregion, $weight + 1); } } } $this->reposition_block($block->instance->id, $newregion, $newweight); } $this->page->ensure_param_not_in_url('bui_moveid'); $this->page->ensure_param_not_in_url('bui_newregion'); $this->page->ensure_param_not_in_url('bui_newweight'); return true; }