Drupal 8 图像与图像风格

Question

In drupal 7, i use function image_style_url('style', uri) to generate new image with style and return image's path. so what will be instead of it in drupal 8? thanks

Answer 1

Per the change records :

use Drupal\image\Entity\ImageStyle;

$path = 'public://images/image.jpg';
$url = ImageStyle::load('style_name')->buildUrl($path);

Answer 2

You should try to use the new Drupal functions wherever possible.

Instead, use:

use Drupal\file\Entity\File;
use Drupal\image\Entity\ImageStyle;

$fid = 123;
$file = File::load($fid);
$image_uri = ImageStyle::load('your_style-name')->buildUrl($file->getFileUri());

Edited as per https://www.drupal.org/node/2050669 :

$original_image = 'public://images/image.jpg';

// Load the image style configuration entity
use Drupal\image\Entity\ImageStyle;
$style = ImageStyle::load('thumbnail');

$uri = $style->buildUri($original_image);
$url = $style->buildUrl($original_image);

Answer 3

In your Controllers and other OOP part of Drupal you can use :

use Drupal\image\Entity\ImageStyle;

$path = 'public://images/image.jpg';
$url = ImageStyle::load('style_name')->buildUrl($path);

And in YOUR_THEME.theme file while Error: Class 'ImageStyle' not found in YOURTHEMENAME_preprocess_node you can do it with the follwing

 $path = 'public://images/image.jpg';
 $style = \Drupal::entityTypeManager()->getStorage('image_style')->load('thumbnail');
 $url = $style->buildUrl($path);

Another method is provide a renderable array and let the drupal Render engine render it.

$render = [
    '#theme' => 'image_style',
    '#style_name' => 'thumbnail',
    '#uri' => $path,
    // optional parameters
];

Answer 4

I have found that I often want to preprocess the image to apply an image style to an image on a node or a paragraph type. In many cases I have created a paragraph that allows the user to choose the width of the image as a percentage. In the preprocess I would check the value of the width and apply the correct image style.

use Drupal\image\Entity\ImageStyle;

function THEME_preprocess_paragraph__basic_content(&$vars) {
  //get the paragraph
  $paragraph = $vars['paragraph'];

  //get the image
  $images = $paragraph->get('field_para_image');
  //get the images value, in my case I only have one required image, but if you have unlimited image, you could loop thru $images
  $uri = $images[0]->entity->uri->value;

  //This is my field that determines the width the user wants for the image and is used to determine the image style
  $preset = $paragraph->get('field_column_width')->value;

  $properties = array();
  $properties['title'] = $images[0]->getValue()['title'];
  $properties['alt'] = $images[0]->getValue()['alt'];

  //this is where the Image style is applied
  switch($preset) {
     case 'image-20':
       $properties['uri'] = ImageStyle::load('width_20_percent')->buildUrl($uri);
       break;
     case 'image-45':
       $properties['uri'] = ImageStyle::load('width_45_percent')->buildUrl($uri);
       break;
     case 'image-55':
       $properties['uri'] = ImageStyle::load('width_55_percent')->buildUrl($uri);
       break;
     case 'image-100':
       $properties['uri'] = ImageStyle::load('width_100_percent')->buildUrl($uri);
       break;
  }
  //assign to a variable that the twig template can use
  $vars['basic_image_display'] = $properties;
}

In this example, I am preprocessing a specific paragraph type named "basic_content" but you can do the same thing with a node preprocess. Continuing my example, I would have a twig template named paragraph--basic_content.html.twig to handle the display of that paragraph type.

Displaying the image would be something like this in the twig file.

<img class="img-responsive" src="{{basic_image_display['uri']}}" alt="{{ basic_image_display['alt'] }}" title="{{ basic_image_display['title'] }}"/>

Answer 5

Works for me from a classic Drupal database Query in .module file :

$query = \Drupal::database()->select('file_managed', 'f' );
$query->addField('f', 'uri');
$pictures = $query->execute()->fetchAll();

foreach ($pictures as $key => $picture) {

   $largePictureUri = entity_load('image_style', 'large')->buildUrl($picture->uri);
}

Answer 6

$view_mode = $variables['content']['field_media_image']['0']['#view_mode'];
$display_content = \Drupal::service('entity_display.repository')
->getViewDisplay('media', 'image', $view_mode)->build($media_entity);
$style = ImageStyle::load($display_content['image'][0]['#image_style']); $original_image = $media_entity->get('image')->entity->getFileUri();
$destination = $style->buildUri($original_image);

This is how you get image style from a media image entity.

Answer 7

I used in Drupal 8 this code. It's working fine.

$fid = 374; //get your file id, this value just for example 
$fname = db_select('file_managed', 'f')->fields('f', array('filename'))->condition('f.fid', $fid)->execute()->fetchField();
$url = entity_load('image_style', 'YOUR_STYLE_NAME')->buildUrl($fname);