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<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
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/**
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 * Form for adding a block to a multiblock instance.
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 *
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 * @package   block_multiblock
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 * @copyright 2022 University of Bath
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 * @author    James Pearce <jmp201@bath.ac.uk>
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 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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 */
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namespace block_multiblock;
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use block_multiblock\helper;
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/**
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 * Library for adding a block to a multiblock instance.
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 *
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 * @package   block_multiblock
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 */
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class adddefaultblock {
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    /** @var array Storage of the block name -> block description of possibly addable sub-blocks. */
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    public $blocklist = [];
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    /**
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     * Initialise the adding of a block to the multiblock.
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     *
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     * @param int $id is the id of the multiblock
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     * @param array $arraytoadd is an array of blocks to add
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     * @param object $multiblockinstance is the parent multiblock instance
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     */
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    public function init($id, $arraytoadd, $multiblockinstance) {
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        $this->set_blocks_to_add($id, $arraytoadd, $multiblockinstance);
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    }
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    /**
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     * This checks the blocks that can bee added to a multiblock,
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     * selects the ones defined in the current default blocks setting and creates an instance of that new block
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     * then moves it to the multiblock.
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     *
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     * @param int $blockid is the id of the multiblock
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     * @param array $arraytoadd is an array of blocks to add
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     * @param object $multiblockinstance is the parent multiblock instance
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     */
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    public function set_blocks_to_add($blockid, $arraytoadd, $multiblockinstance) {
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        global $DB, $PAGE;
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        // Load all possible blocks for the page.
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        $blockmanager = $PAGE->blocks;
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        $blockmanager->load_blocks();
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        // Loop over the $arraytoadd to find the blocks to add, within the addable blocks.
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        foreach ($arraytoadd as $toadd) {
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            foreach ($blockmanager->get_addable_blocks() as $block) {
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                if ($block->name == 'multiblock') {
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                    continue;
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                }
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                // Found a block to add.
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                if ($toadd == $block->name) {
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                    // Add the block to the block list.
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                    $this->blocklist[$block->name] = $block;
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                    // Create a new instance of the block to add. This will put the new default blocks in the side-pre region.
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                    $blockmanager->add_block($toadd, 'side-pre', 10, false);
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                    $addedblocks = $DB->get_records('block_instances', ['parentcontextid' => $multiblockinstance->parentcontextid]);
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                    foreach ($addedblocks as $addedblock) {
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                        if ($addedblock->blockname == $toadd) {
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                            // Move the newly created blocks into the multiblock.
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                            helper::move_block($addedblock->id, $blockid);
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                        }
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                    }
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                }
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            }
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        }
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    }
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}