add variation price to the Product variation title widget

Not sure about what you mean. Anyway, you can to setup a Product variation view mode, and show up needed fields there :).

Cheers.

Just for info, to get this feature, I create a custom FieldWidget which extends ProductVariationWidgetAttributes, and I override the getAttributeValues() method with this piece of code (just added the price logic)

protected function getAttributeValues(array $variations, $field_name, callable $callback = NULL) {
    $values = [];
    foreach ($variations as $variation) {
      $price = $variation->getPrice();
      $number = $price->getNumber();
      $currency = $this->currencyStorage->load($price->getCurrencyCode());
      $price_formatted = $price->isZero() ? $this->t('Free') : $this->numberFormatter->formatCurrency($number, $currency);
      if (is_null($callback) || call_user_func($callback, $variation)) {
        $attribute_value = $variation->getAttributeValue($field_name);
        if ($attribute_value) {
          $values[$attribute_value->id()] = $attribute_value->label() . '<span class="price">' . $price_formatted . '</span>';
        }
        else {
          $values['_none'] = '';
        }
      }
    }

    return $values;
  }

Same can be done of course on the ProductVariationTitleWidget widget.

I believe this is a common feature request on e-commerce site. this could be done :

1. by providing another two widgets (ProductVariationTitlePrice, ProductVariationAttributesPrice)
2. by a setting on the two existing widget.

The rendered result wanted can look like below

@joachim Could it be handled in the same way it was handled in #2805549: Expand the "Calculated price" formatter with the ability to show prices with promotions/taxes/fees?

The new commerce_order formatter (PriceCalculatedFormatter) was created without a plugin annotation. Then in commerce_order.module, hook_field_formatter_info_alter was created to "swap out" the existing commerce_price formatter (commerce_price_calculated) with the commerce_order version.

function commerce_order_field_formatter_info_alter(array &$info) {
  $info['commerce_price_calculated']['class'] = 'Drupal\commerce_order\Plugin\Field\FieldFormatter\PriceCalculatedFormatter';
  $info['commerce_price_calculated']['provider'] = 'commerce_order';
}

So that would require a new widget in commerce_order, one that replaces this widget whenever the Order module is installed...

Re-roll of the original patch, with the extra service passed through and also two extra "separator" text fields which makes the prefix and suffix configurable.

E.g. "title - price" vs "title (price)".

I was hoping it would also handle the user case that @flocondetoile had, which was to wrap the price in an HTML element, but that might require some selective sanitation. (Perhaps a third textfield/select option for HTML an element wrapper?) Since I do not have such a need, I decided to leave that out. That screenshot also shows radios, which sounds like another good config that can be added without requiring people to override the whole widget. These two extra suggestions might be considered overkill to the core commerce experience though, so I am just leaving them as comments rather than pursuing implementation.

Rerolled against latest 8.x-2.x.

#13 works for me despite the failed tests in #14

Would it be possible to add support for rendering the calculated price to enable support for products matching a promotion/being on sale? My use case is having promotions like "X amount off normal price" in a sale period. But using this patch only renders the normal price, not the reduced one.

FYI I used Entity Extra Field to create an "extra" field that output the variation's price - not as clean as having a dedicated formatter, but it worked.