AFAICT, there's no D8 equivalent of the 'theme callback' property of hook_menu() items on D7.

But... there is, it's CustomThemeNegotiator. But it's in a test module, theme_test.

It provides a '_custom_theme' property to routes, which lets you specify the theme:

theme_test.function_template_override:
  path: '/theme-test/function-template-overridden'
  options:
    _custom_theme: 'test_theme'
  defaults:
    _controller: '\Drupal\theme_test\ThemeTestController::functionTemplateOverridden'
  requirements:
    _access: 'TRUE'

It would be useful to move this into system module, so it can be used.

Comments

joachim created an issue. See original summary.

dawehner’s picture

Well, the equivalent is to write your own theme negotiator ...

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