From 44c55d4662a95aaccf5444e5c35fff4b89890e9e Mon Sep 17 00:00:00 2001
From: sam_marshall <sam_marshall>
Date: Fri, 14 Jul 2006 11:17:46 +0000
Subject: [PATCH] Added hooks so that blocks can create functions that are run
 when they are installed and uninstalled. The base implementation does
 nothing.

---
 admin/blocks.php             |  3 +++
 blocks/moodleblock.class.php | 14 ++++++++++++++
 lib/blocklib.php             |  3 ++-
 3 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/admin/blocks.php b/admin/blocks.php
index 32553d9992..76f4c9f98b 100644
--- a/admin/blocks.php
+++ b/admin/blocks.php
@@ -89,6 +89,9 @@
             exit;
 
         } else {
+            // Inform block it's about to be deleted
+            block_instance($block->name)->before_delete();
+            
             // Delete block
             if (!delete_records('block', 'id', $block->id)) {
                 notify("Error occurred while deleting the $strblockname record from blocks table");
diff --git a/blocks/moodleblock.class.php b/blocks/moodleblock.class.php
index b18f85f032..a6ffbdca4c 100644
--- a/blocks/moodleblock.class.php
+++ b/blocks/moodleblock.class.php
@@ -108,6 +108,20 @@ class block_base {
     function __construct() {
         $this->block_base();
     }
+    
+    /** 
+     * Function that can be overridden to do extra setup after
+     * the database install. (Called once per block, not per instance!)
+     */
+    function after_install() {
+    }
+    
+    /**
+     * Function that can be overridden to do extra cleanup before
+     * the database tables are deleted. (Called once per block, not per instance!)
+     */
+    function before_delete() {
+    }
 
     /**
      * Returns the block name, as present in the class name,
diff --git a/lib/blocklib.php b/lib/blocklib.php
index 2b0cf5927f..c73a53b83f 100644
--- a/lib/blocklib.php
+++ b/lib/blocklib.php
@@ -1130,6 +1130,7 @@ function upgrade_blocks_plugins($continueto) {
             if (!is_dir($fullblock .'/db/') || modify_database($fullblock .'/db/'. $CFG->dbtype .'.sql')) {
                 $db->debug = false;
                 if ($block->id = insert_record('block', $block)) {
+                    $blockobj->after_install();
                     notify(get_string('blocksuccess', '', $blocktitle), 'notifysuccess');
                     echo '<hr />';
                 } else {
@@ -1173,4 +1174,4 @@ function upgrade_blocks_plugins($continueto) {
     }
 }
 
-?>
+?>
\ No newline at end of file
-- 
2.39.5