Explore block module in Drupal
发布时间：2015-05-27 19:30:52作者：知识屋
block.install is executed when block is installed. The purpose of this file is to create the necessary tables: block, block_custom, block_role
Table block is used to store the block information declared by code statements;
Table block_custom is used to store the block information created by administration interface;
Table block_role is used to control the visibility of blocks.
The main logic are defined in the block.module file. Let us go around this file.There are lots of functions in block.module,but they can be categorized into two types: hook function and block module internal-used function.hook function includes block_menu, block_theme, block_theme_initialize, block_themes_enable.
Function block_menu:block configuration, block management, block list by theme
[html]
$default_theme = variable_get('theme_default', 'bartik');
$items['admin/structure/block'] = array(
'title' => 'Blocks',
'description' => 'Configure what block content appears in your site/'s sidebars and other regions.',
'page callback' => 'block_admin_display',
'page arguments' => array($default_theme),
'access arguments' => array('administer blocks'),
'file' => 'block.admin.inc',
);
$items['admin/structure/block/manage/%/%'] = array(
'title' => 'Configure block',
'page callback' => 'drupal_get_form',
'page arguments' => array('block_admin_configure', 4, 5),
'access arguments' => array('administer blocks'),
'file' => 'block.admin.inc',
);
$items['admin/structure/block/manage/%/%/configure'] = array(
'title' => 'Configure block',
'type' => MENU_DEFAULT_LOCAL_TASK,
'context' => MENU_CONTEXT_INLINE,
);
$items['admin/structure/block/manage/%/%/delete'] = array(
'title' => 'Delete block',
'page callback' => 'drupal_get_form',
'page arguments' => array('block_custom_block_delete', 4, 5),
'access arguments' => array('administer blocks'),
'type' => MENU_LOCAL_TASK,
'context' => MENU_CONTEXT_NONE,
'file' => 'block.admin.inc',
);
$items['admin/structure/block/add'] = array(
'title' => 'Add block',
'page callback' => 'drupal_get_form',
'page arguments' => array('block_add_block_form'),
'access arguments' => array('administer blocks'),
'type' => MENU_LOCAL_ACTION,
'file' => 'block.admin.inc',
);
foreach (list_themes() as $key => $theme) {
$items['admin/structure/block/list/' . $key] = array(
'title' => check_plain($theme->info['name']),
'page arguments' => array($key),
'type' => $key == $default_theme ? MENU_DEFAULT_LOCAL_TASK : MENU_LOCAL_TASK,
'weight' => $key == $default_theme ? -10 : 0,
'access callback' => '_block_themes_access',
'access arguments' => array($theme),
'file' => 'block.admin.inc',
);
if ($key != $default_theme) {
$items['admin/structure/block/list/' . $key . '/add'] = array(
'title' => 'Add block',
'page callback' => 'drupal_get_form',
'page arguments' => array('block_add_block_form'),
'access arguments' => array('administer blocks'),
'type' => MENU_LOCAL_ACTION,
'file' => 'block.admin.inc',
);
}
$items['admin/structure/block/demo/' . $key] = array(
'title' => check_plain($theme->info['name']),
'page callback' => 'block_admin_demo',
'page arguments' => array($key),
'type' => MENU_CALLBACK,
'access callback' => '_block_themes_access',
'access arguments' => array($theme),
'theme callback' => '_block_custom_theme',
'theme arguments' => array($key),
'file' => 'block.admin.inc',
);
}
return $items;
}
Function block_theme: offers two theme options: block is for front-end and block_admin_display_form is for administration interface
[html]
function block_theme() {
return array(
'block' => array(
'render element' => 'elements',
'template' => 'block',
),
'block_admin_display_form' => array(
'template' => 'block-admin-display-form',
'file' => 'block.admin.inc',
'render element' => 'form',
),
);
}
Function block_theme_initialize: assign the blocks to theme's regions
[php]
function block_theme_initialize($theme) {
// Initialize theme's blocks if none already registered.
$has_blocks = (bool) db_query_range('SELECT 1 FROM {block} WHERE theme = :theme', 0, 1, array(':theme' => $theme))->fetchField();
if (!$has_blocks) {
$default_theme = variable_get('theme_default', 'bartik');
// Apply only to new theme's visible regions.
$regions = system_region_list($theme, REGIONS_VISIBLE);
$result = db_query("SELECT * FROM {block} WHERE theme = :theme", array(':theme' => $default_theme), array('fetch' => PDO::FETCH_ASSOC));
foreach ($result as $block) {
// If the region isn't supported by the theme, assign the block to the theme's default region.
if ($block['status'] && !isset($regions[$block['region']])) {
$block['region'] = system_default_region($theme);
}
$block['theme'] = $theme;
unset($block['bid']);
drupal_write_record('block', $block);
}
}
}
Function block_themes_enable: iterate the theme list and assign block list to its regions.
[html]
function block_themes_enabled($theme_list) {
foreach ($theme_list as $theme) {
block_theme_initialize($theme);
}
}
（免责声明：文章内容如涉及作品内容、版权和其它问题，请及时与我们联系，我们将在第一时间删除内容，文章内容仅供参考）
相关知识
-
如何对PHP文件进行加密方法 PHP实现加密的几种方式介绍
-
php生成圆角图片的方法 电脑中php怎么生成圆角图片教程
-
用PHP构建一个留言本方法步骤 php怎么实现留言板功能
-
php中三元运算符用法 php中的三元运算符使用说明
-
php文件如何怎么打开方式介绍 php文件用什么打开方法
-
PHP怎么插入数据库方法步骤 php编程怎么导入数据库教程
-
如何安装PHPstorm并配置方法教程 phpstorm安装后要进行哪些配置
-
PHP 获取远程文件大小的3种解决方法 如何用PHP获取远程大文件的大小
-
20个实用PHP实例代码 php接口开发实例代码详细介绍
-
如何架设PHP服务器方法步骤 怎么搭建php服务器简单教程
软件推荐
更多 >
-
1
-
2
php MYSQL数据操作类
-
3
PHP单元测试利器：PHPUNIT初探
-
4
php .htaccess 伪静态
-
5
PHP整合PayPal支付
-
6
PHP与ASP比较：这还值得讨论吗？
-
7
PHP与XML结合的网站编程
-
8
Warning: ftp_put() 问题的解决办法之被动模式
-
9
PHP Socket 编程
-
10
PHP性能优化总结
