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I have a image field in my content type. In that field the images should be saved in two image sizes. As an example when I uploaded a photo it should save as two photos. One for 200x200 px and one for 360x360 px.

When I change the function settingsForm(array $form, FormStateInterface $form_state) in ImageWidget.php as below it applies to the all image tags in content types.

public function settingsForm(array $form, FormStateInterface $form_state) {

    $element = parent::settingsForm($form, $form_state);

    $element['preview_image_style'] = [
      '#title' => t('Preview image style'),
      '#type' => 'select',
      '#options' => image_style_options(FALSE),
      '#empty_option' => '<' . t('no preview') . '>',
      '#default_value' => $this->getSetting('preview_image_style'),
      '#description' => t('The preview image will be shown while editing the content.'),
      '#weight' => 15,
    ];

    $element['main_image_style'] = [
      '#title' => t('Main image style'),
      '#type' => 'select',
      '#options' => image_style_options(FALSE),
      '#empty_option' => '<' . t('no preview') . '>',
      '#default_value' => $this->getSetting('main_image_style'),
      '#description' => t('The main image will be shown when opening the popup.'),
      '#weight' => 14,
    ];

    return $element;
}

I need to do this only for a selected content types selected image field. Is there a way to do this?

  • Setting two image styles in the widget doesn't seem to make much sense to me. Please describe, WHY you want to do this. I suppose we're able to point you to how to alter the output then. – Mario Steinitz Dec 28 '17 at 5:40
  • I need this to create an image gallery. In the gallery page the image size should be low and when I click on the gallery image it should show the bigger pixelated image. And when I click download I want to download the original image. @MarioSteinitz – i am batman Dec 28 '17 at 5:57
  • Another question seems to be interesting: Do you really need the image style to be configurable from within the admin UI? – Mario Steinitz Dec 28 '17 at 6:01
  • Yes I need to add image styles from admin UI and in the ' Manage Form Display ' of the content type I need to assign those image styles to image element. @MarioSteinitz – i am batman Dec 28 '17 at 6:21
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Instead of altering the default field widget of the image fields, you should create an own custom field widget.

You may either extend the existing widget, or create it from the scratch by copying the image field widget's code to your own widget.

Then you will be able to just select that widget for your images that require two image styles to be selected, while other image fields can still use the default widget.

Edit:

For defining the different image styles for output to the end user (within your slider), you will be better off to creating a custom field formatter with according settings and output and choosing this formatter in "Manage display" of your content type. A good starting point once again is the existing field formatter.

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