How can I set the height of the classic editor per post-type?

Question

Can't seem to find any valuable info on this at the moment - I just want to resize the height of the classic editor field for my Custom Post types.

I was hoping to just drop a function or code snippet into functions.php for this, if possible?

In this example I would have 3 Custom Post types: 'Tools', 'Brand' and 'Company' and for all three I would like the editor to only be about a qtr of its height or about 120px tall or 8 lines.

Many thanks for any help in on this!

Answer 1

One way is to adjust the TinyMCE settings:

add_filter( 'tiny_mce_before_init', function( $settings ) {
    $settings['height'] = '120';
    $settings['autoresize_max_height'] = '120';
    return $settings;   
} );

and e.g. restrict further on post types and !block editor with get_current_screen().

Example:

add_filter( 'tiny_mce_before_init', function( $settings ) {

    $screen = get_current_screen();

    if ( $screen->is_block_editor() ) {
        return $settings;
    }        

    if ( ! in_array( $screen->post_type, ['tools', 'brand', 'company'], true ) ) {
        return $settings;
    }        

    $settings['height'] = '120';
    $settings['autoresize_max_height'] = '120';

    return $settings;
 } );

Answer 2

You can insert custom style in the WP admin section via admin_head action hook.

function wp123_set_editor_height() {
  ?>
  <style type="text/css">
    /* For PAGE post type */
    body.post-type-page #postdivrich #wp-content-editor-container iframe {
      height:  120px !important;
    }
  </style>
  <?php
}
add_action( 'admin_head', 'wp123_set_editor_height' );

Say for example your custom post type is "sample" then you have to target the body as follows:

body.post-type-sample