/**
* Returns a 'srcset' attribute.
*
* @since 2.1.0
* @deprecated 3.0.0 Use 'wp_get_attachment_image_srcset()'
* @see 'wp_get_attachment_image_sizes()'
* @see 'wp_calculate_image_srcset()'
*
* @param int $id Image attachment ID.
* @param array|string $size Image size. Accepts any valid image size, or an array of width and height
* values in pixels (in that order). Default 'medium'.
* @return string|bool A full 'srcset' string or false.
*/
function tevkori_get_srcset_string($id, $size = 'medium')
{
_deprecated_function(__FUNCTION__, '3.0.0', 'wp_get_attachment_image_srcset()');
if (has_filter('tevkori_srcset_array')) {
$srcset_value = tevkori_get_srcset($id, $size);
return $srcset_value ? 'srcset="' . $srcset_value . '"' : false;
} else {
$srcset_value = wp_get_attachment_image_srcset($id, $size);
return $srcset_value ? 'srcset="' . $srcset_value . '"' : false;
}
}
/**
* Ajax handler for updating the srcset when an image is changed in the editor.
*
* @since 2.3.0
*
* @return string A sourcest value.
*/
function tevkori_ajax_srcset()
{
// Bail early if no post ID is passed.
if (empty($_POST['postID'])) {
return;
}
$postID = (int) $_POST['postID'];
if (!$postID) {
return;
}
// Grab the image size being passed from the AJAX request.
$size = empty($_POST['size']) ? $_POST['size'] : '';
// Get the srcset value for our image.
$srcset = tevkori_get_srcset($postID, $size);
// For AJAX requests, we echo the result and then die.
wp_send_json($srcset);
}
/**
* @expectedDeprecated tevkori_get_srcset
* @expectedDeprecated tevkori_get_srcset_array
*/
function test_tevkori_get_srcset_single_srcset()
{
// Make an image.
$id = self::$large_id;
/*
* In our tests, thumbnails would only return a single srcset candidate,
* in which case we don't bother returning a srcset array.
*/
$this->assertTrue(1 === count(tevkori_get_srcset_array($id, 'thumbnail')));
$this->assertFalse(tevkori_get_srcset($id, 'thumbnail'));
}
/**
* Filter to add 'srcset' and 'sizes' attributes to post thumbnails and gallery images.
*
* @see wp_get_attachment_image_attributes
* @return array Attributes for image.
*/
function tevkori_filter_attachment_image_attributes($attr, $attachment, $size)
{
if (!isset($attr['srcset'])) {
$srcset = tevkori_get_srcset($attachment->ID, $size);
// Set the 'srcset' attribute if one was returned.
if ($srcset) {
$attr['srcset'] = $srcset;
if (!isset($attr['sizes'])) {
$sizes = tevkori_get_sizes($attachment->ID, $size);
// Set the 'sizes' attribute if sizes were returned.
if ($sizes) {
$attr['sizes'] = $sizes;
}
}
}
}
return $attr;
}
function test_tevkori_get_srcset_single_srcset()
{
// make an image
$id = $this->_test_img();
// In our tests, thumbnails would only return a single srcset candidate,
// in which case we don't bother returning a srcset array.
$sizes = tevkori_get_srcset($id, 'thumbnail');
$this->assertTrue(1 === count(tevkori_get_srcset_array($id, 'thumbnail')));
$this->assertFalse(tevkori_get_srcset($id, 'thumbnail'));
}
