scroll_to_top.module in scroll to top 8.0

Provide scroll to top link.

File

scroll_to_top.module

<?php

/**
 * @file
 * Provide scroll to top link.
 */

/**
 * Implementation of hook_preprocess_page().
 */
function scroll_to_top_preprocess_page(&$variables) {
  $theme = \Drupal::theme()
    ->getActiveTheme()
    ->getName();
  $admin_theme = \Drupal::config('system.theme')
    ->get('admin');
  $config = \Drupal::config('scroll_to_top.settings');
  if ($config
    ->get('scroll_to_top_enable_admin_theme') == TRUE || $config
    ->get('scroll_to_top_enable_admin_theme') == FALSE && $theme != $admin_theme) {
    $variables['#attached']['library'][] = 'scroll_to_top/scroll_to_top';

    //building the css style
    $position = "";

    // Button position
    if ($config
      ->get('scroll_to_top_position', 1) == 1) {
      $position = "#back-top { right:40px; }";
    }
    if ($config
      ->get('scroll_to_top_position') == 3) {
      $position = $position = "#back-top { left:50%;margin:0px;}";
    }

    // Display label
    if ($config
      ->get('scroll_to_top_display_text') == FALSE) {
      $display = "span#link {display : none;}";
    }
    else {
      $display = "";
    }

    // background color on hover
    $bgcolor = "#back-top span#button { background-color: " . $config
      ->get('scroll_to_top_bg_color_out') . ";}";
    $bgcolor .= " #back-top span#button:hover {opacity:1;filter:alpha(opacity = 1);background-color: " . $config
      ->get('scroll_to_top_bg_color_hover') . ";}";
    $css = $position;
    $css .= $bgcolor;
    $css .= $display;
    $variables['#attached']['html_head'][] = [
      [
        '#tag' => 'style',
        '#value' => '.' . $css . '',
      ],
      'scroll_to_top_new_css',
    ];
    $variables['#attached']['drupalSettings']['scroll_to_top']['label'] = $config
      ->get('scroll_to_top_label');
  }

  // end if
}

// end scroll_to_top_page_build

Functions

Name	Description
scroll_to_top_preprocess_page	Implementation of hook_preprocess_page().