Development:Very flexible block system proposal

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This is my attempt the devise the most flexible possible blocks system I could, which still had reasonable performance. (Whether that was a sensible thing to do remains to be seen ;-))

Goals

• Existing blocks should continue to work in the new scheme. (If absolutely necessary, we may require small changes.)
• Consistent implementation of (essentially) every page in Moodle.
• Let themes, and possibly the page itself, determine where on the page the blocks should appear. (I.e, not just 'right' and 'left'.)
• Much more flexible sticky blocks. (Every course, in a category, any page of any type in this course, etc.)

Setting the scene

This relies on some ideas from Development:Navigation/Pagelib/Blocks_2.0_design.

What happens when a page is requested

The page, for example, mod/quiz/attempt.php, ...

Inner workings of this proposal

Database tables

Column	Type	Comment

What happens when a page is requested

SELECT * FROM
    mdl_block_instances bi
    LEFT JOIN mdl_block_positions bp ON bp.blockinstanceid = bi.id
                                        AND bp.contextid = $contextid
                                        AND bp.pagetype = $pagetype
                                        AND bp.subtype = $subtype

WHERE 
    bi.contextid IN ($thiscontextandparents)
AND $pagetype LIKE bi.pagetypepattern
    $subtype LIKE bi.subtypepattern

ORDER BY
    bp.position,
    bp.weight

See also

• http://moodle.org/mod/forum/discuss.php?d=95882 General Developer Forum thread about this.
• Development:Navigation/Pagelib/Blocks_2.0_design
• Development:Navigation_2.0
• Roadmap