Source
File: wp-includes/widgets/class-wp-widget-media-gallery.php
public function render_control_template_scripts() {
parent::render_control_template_scripts();
?>
<script type="text/html" id="tmpl-wp-media-widget-gallery-preview">
<#
var ids = _.filter( data.ids, function( id ) {
return ( id in data.attachments );
} );
#>
<# if ( ids.length ) { #>
<ul class="gallery media-widget-gallery-preview" role="list">
<# _.each( ids, function( id, index ) { #>
<# var attachment = data.attachments[ id ]; #>
<# if ( index < 6 ) { #>
<li class="gallery-item">
<div class="gallery-icon">
<img alt="{{ attachment.alt }}"
<# if ( index === 5 && data.ids.length > 6 ) { #> aria-hidden="true" <# } #>
<# if ( attachment.sizes.thumbnail ) { #>
src="{{ attachment.sizes.thumbnail.url }}" width="{{ attachment.sizes.thumbnail.width }}" height="{{ attachment.sizes.thumbnail.height }}"
<# } else { #>
src="{{ attachment.url }}"
<# } #>
<# if ( ! attachment.alt && attachment.filename ) { #>
aria-label="
<?php
echo esc_attr(
sprintf(
/* translators: %s: The image file name. */
__( 'The current image has no alternative text. The file name is: %s' ),
'{{ attachment.filename }}'
)
);
?>
"
<# } #>
/>
<# if ( index === 5 && data.ids.length > 6 ) { #>
<div class="gallery-icon-placeholder">
<p class="gallery-icon-placeholder-text" aria-label="
<?php
printf(
/* translators: %s: The amount of additional, not visible images in the gallery widget preview. */
__( 'Additional images added to this gallery: %s' ),
'{{ data.ids.length - 5 }}'
);
?>
">+{{ data.ids.length - 5 }}</p>
</div>
<# } #>
</div>
</li>
<# } #>
<# } ); #>
</ul>
<# } else { #>
<div class="attachment-media-view">
<button type="button" class="placeholder button-add-media"><?php echo esc_html( $this->l10n['add_media'] ); ?></button>
</div>
<# } #>
</script>
<?php
}