Help with Child Theme

[onespaceman]

I need help setting up a child theme that inherits gravstrap. I'm following this guide

When add mytheme.php it throws the error

Whoops \ Exception \ ErrorException (E_ERROR) Class 'Grav\Theme\Gravstrap' not found

files:

mytheme/ --- css/ --- --- custom.css --- blueprints.yaml --- mytheme.yaml --- mytheme.php

custom.css:

* {
  background: #FF0000;
}

mytheme.yaml

enabled: true
streams:
 schemes:
   theme:
     type: ReadOnlyStream
     prefixes:
       '':
         - user/themes/mytheme
         - user/themes/gravstrap-theme

mytheme.php

<?php
namespace Grav\Theme;

use Grav\Common\Theme;

class Mytheme extends Gravstrap
{
}

[giansi]

Hi, the mytheme.php is wrong. You extend Gravstrap but you do not use it and that's the reason of the exception. Anyway, you should extend GravstrapTheme instead of Gravstrap, which is a plugin:

use Grav\Theme\GravstrapTheme;

class Mytheme extends GravstrapTheme { }

And this should work.

At last, you can omit to create the mytheme.php and theme inheritance should also work.

Let me know if that fixes.

[onespaceman]

Thanks for the reply.

Ok, the php didn't work so I got rid of it. I did some more testing and overriding worked for twig templates, but not for css. I had to add this:

{% do assets.addCss('theme://css/custom.css',105) %}

to gravstrap-theme/templates/partials/base.html.twig on line 19 for it to work.

[giansi]

You have to copy the gravstrap-theme/templates/partials/base.html.twig to mytheme/templates/partials/base.html.twig then add your custom css {% do assets.addCss('theme://css/custom.css',105) %} to mytheme/templates/partials/base.html.twig template.

Let me know if that worked.

[onespaceman]

Yep. That's what I ended up doing.

[giansi]

Perfect! In the theme inheritance post, they suggest to copy the entire theme to your new one, then customize this last one. I prefer to copy only what I need to customize, but that's a matter of taste: both of them work as expected.

[giansi]

@onespaceman let me know if you build and launch a website based on this theme. Thank you

[ossplus]

Mytheme.php

namespace Grav\Theme;

use Grav\Theme\GravstrapTheme;

class Mytheme extends GravstrapTheme
{
}

then it show error:

Whoops \ Exception \ ErrorException (E_ERROR)

Class 'Grav\Theme\GravstrapTheme' not found 

when i use

namespace Grav\Theme;

use Grav\Common\Theme;

class Mytheme extends Theme
{
}

it works.

[datavoyager]

It's possible that this is an autoloading problem.

I get the same error when trying to extend the Gravstrap theme using the advice given at http://learn.getgrav.org/themes/customization#theme-inheritance

When I add the following to composer.json

"autoload": {
        "psr-4": {
            "Grav\\": "system/src/Grav"
        },
        "files": ["system/defines.php", "user/themes/gravstrap-theme/gravstrap-theme.php"]
    },

it works as expected.

[giansi]

Another solution is to require the GravstrapTheme as follows:

require_once(DIR . '/../gravstrap-theme/gravstrap-theme.php');

[jbonlinea]

Hi guys,

It's an old thread, but it helped me and I have a complementary info.

As today up to date version of grav and gravstrap, you

• indeed need to extend GravstrapTheme and not Gravstrap, I assume this is related to line 6 of gravstrap-theme.php where the class is declared class GravstrapTheme extends Theme
• there is no need to add use Grav\Common\GravstrapTheme; oruse Grav\Common\Theme; in your Mytheme.php as it is already declared in gravestrap-theme.php line 4

In the end mytheme.php looks like this and it's working.

<?php
namespace Grav\Theme;

class Mytheme extends GravstrapTheme
{
   // Some new methods, properties etc.
}
?>

Hope this might help

Cheers