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D8 Programmatically change page orientation for Entity Print module

In many projects, some entities needs to be printed on LANDSCAPE format, others, on PORTRAIT.
I was searching for an example or, maybe, a more precise way to implement a page orientation hook, but didn’t really find any.
I just need to do something like

if($entity_type = "foo"){ set page orientation to portrait }

On this issue, benjy wrote :
If you need to do this programatically, see PrintEvents::CONFIGURATION_ALTER

I looked at the code and saw TestEngineConfigurationAlter class. So I tried to replicate this in a custom module, but it doesn’t seem to do anything. I’m obviously missing a piece of the puzzle and I’m humbly asking for help.

Thank you very much 🙂

Related issues on drupal.org

  • 2797877: Setting paper orientation for dompdf?
  • 2715875: Setting paper size for dompdf in D8
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D8 Programmatically change page orientation for Entity Print module

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