Hook block save

Question

I have to perform certain operations when block configurations are get changed. And I successfully implemented hook_block_save() and worked.

But the hook is not called up when we change the 'region' of blocks in page 'admin/structure/block'.

Are there any other methods other than injecting an extra submit handler to the form displayed in 'admin/structure/block' page?

Answer 1

The block_admin_display_form_submit() function (submit handler for the block admin form) manipulates the region value for the blocks in the database directly, and doesn't invoke any hooks.

That being said, the only 'good' way you're going to be able to do this is to add an additional submit handler to the form in a form_alter hook as you've suggested.