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   1  <?php
   2  // This file is part of Moodle - http://moodle.org/
   3  //
   4  // Moodle is free software: you can redistribute it and/or modify
   5  // it under the terms of the GNU General Public License as published by
   6  // the Free Software Foundation, either version 3 of the License, or
   7  // (at your option) any later version.
   8  //
   9  // Moodle is distributed in the hope that it will be useful,
  10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  // GNU General Public License for more details.
  13  //
  14  // You should have received a copy of the GNU General Public License
  15  // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16  
  17  /**
  18   * Book view page
  19   *
  20   * @package    mod_book
  21   * @copyright  2004-2011 Petr Skoda {@link http://skodak.org}
  22   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  23   */
  24  
  25  require(dirname(__FILE__).'/../../config.php');
  26  require_once(dirname(__FILE__).'/locallib.php');
  27  require_once($CFG->libdir.'/completionlib.php');
  28  
  29  $id        = optional_param('id', 0, PARAM_INT);        // Course Module ID
  30  $bid       = optional_param('b', 0, PARAM_INT);         // Book id
  31  $chapterid = optional_param('chapterid', 0, PARAM_INT); // Chapter ID
  32  $edit      = optional_param('edit', -1, PARAM_BOOL);    // Edit mode
  33  
  34  // =========================================================================
  35  // security checks START - teachers edit; students view
  36  // =========================================================================
  37  if ($id) {
  38      $cm = get_coursemodule_from_id('book', $id, 0, false, MUST_EXIST);
  39      $course = $DB->get_record('course', array('id'=>$cm->course), '*', MUST_EXIST);
  40      $book = $DB->get_record('book', array('id'=>$cm->instance), '*', MUST_EXIST);
  41  } else {
  42      $book = $DB->get_record('book', array('id'=>$bid), '*', MUST_EXIST);
  43      $cm = get_coursemodule_from_instance('book', $book->id, 0, false, MUST_EXIST);
  44      $course = $DB->get_record('course', array('id'=>$cm->course), '*', MUST_EXIST);
  45      $id = $cm->id;
  46  }
  47  
  48  require_course_login($course, true, $cm);
  49  
  50  $context = context_module::instance($cm->id);
  51  require_capability('mod/book:read', $context);
  52  
  53  $allowedit  = has_capability('mod/book:edit', $context);
  54  $viewhidden = has_capability('mod/book:viewhiddenchapters', $context);
  55  
  56  if ($allowedit) {
  57      if ($edit != -1 and confirm_sesskey()) {
  58          $USER->editing = $edit;
  59      } else {
  60          if (isset($USER->editing)) {
  61              $edit = $USER->editing;
  62          } else {
  63              $edit = 0;
  64          }
  65      }
  66  } else {
  67      $edit = 0;
  68  }
  69  
  70  // read chapters
  71  $chapters = book_preload_chapters($book);
  72  
  73  if ($allowedit and !$chapters) {
  74      redirect('edit.php?cmid='.$cm->id); // No chapters - add new one.
  75  }
  76  // Check chapterid and read chapter data
  77  if ($chapterid == '0') { // Go to first chapter if no given.
  78      \mod_book\event\course_module_viewed::create_from_book($book, $context)->trigger();
  79  
  80      foreach ($chapters as $ch) {
  81          if ($edit) {
  82              $chapterid = $ch->id;
  83              break;
  84          }
  85          if (!$ch->hidden) {
  86              $chapterid = $ch->id;
  87              break;
  88          }
  89      }
  90  }
  91  
  92  $courseurl = new moodle_url('/course/view.php', array('id' => $course->id));
  93  
  94  // No content in the book.
  95  if (!$chapterid) {
  96      $PAGE->set_url('/mod/book/view.php', array('id' => $id));
  97      notice(get_string('nocontent', 'mod_book'), $courseurl->out(false));
  98  }
  99  // Chapter doesnt exist or it is hidden for students
 100  if ((!$chapter = $DB->get_record('book_chapters', array('id' => $chapterid, 'bookid' => $book->id))) or ($chapter->hidden and !$viewhidden)) {
 101      print_error('errorchapter', 'mod_book', $courseurl);
 102  }
 103  
 104  $PAGE->set_url('/mod/book/view.php', array('id'=>$id, 'chapterid'=>$chapterid));
 105  
 106  
 107  // Unset all page parameters.
 108  unset($id);
 109  unset($bid);
 110  unset($chapterid);
 111  
 112  // Security checks END.
 113  
 114  \mod_book\event\chapter_viewed::create_from_chapter($book, $context, $chapter)->trigger();
 115  
 116  // Read standard strings.
 117  $strbooks = get_string('modulenameplural', 'mod_book');
 118  $strbook  = get_string('modulename', 'mod_book');
 119  $strtoc   = get_string('toc', 'mod_book');
 120  
 121  // prepare header
 122  $pagetitle = $book->name . ": " . $chapter->title;
 123  $PAGE->set_title($pagetitle);
 124  $PAGE->set_heading($course->fullname);
 125  
 126  book_add_fake_block($chapters, $chapter, $book, $cm, $edit);
 127  
 128  // prepare chapter navigation icons
 129  $previd = null;
 130  $nextid = null;
 131  $last = null;
 132  foreach ($chapters as $ch) {
 133      if (!$edit and $ch->hidden) {
 134          continue;
 135      }
 136      if ($last == $chapter->id) {
 137          $nextid = $ch->id;
 138          break;
 139      }
 140      if ($ch->id != $chapter->id) {
 141          $previd = $ch->id;
 142      }
 143      $last = $ch->id;
 144  }
 145  
 146  $navprevicon = right_to_left() ? 'nav_next' : 'nav_prev';
 147  $navnexticon = right_to_left() ? 'nav_prev' : 'nav_next';
 148  $navprevdisicon = right_to_left() ? 'nav_next_dis' : 'nav_prev_dis';
 149  
 150  $chnavigation = '';
 151  if ($previd) {
 152      $chnavigation .= '<a title="'.get_string('navprev', 'book').'" href="view.php?id='.$cm->id.
 153              '&amp;chapterid='.$previd.'"><img src="'.$OUTPUT->pix_url($navprevicon, 'mod_book').'" class="icon" alt="'.get_string('navprev', 'book').'"/></a>';
 154  } else {
 155      $chnavigation .= '<img src="'.$OUTPUT->pix_url($navprevdisicon, 'mod_book').'" class="icon" alt="" />';
 156  }
 157  if ($nextid) {
 158      $chnavigation .= '<a title="'.get_string('navnext', 'book').'" href="view.php?id='.$cm->id.
 159              '&amp;chapterid='.$nextid.'"><img src="'.$OUTPUT->pix_url($navnexticon, 'mod_book').'" class="icon" alt="'.get_string('navnext', 'book').'" /></a>';
 160  } else {
 161      $sec = $DB->get_field('course_sections', 'section', array('id' => $cm->section));
 162      $returnurl = course_get_url($course, $sec);
 163      $chnavigation .= '<a title="'.get_string('navexit', 'book').'" href="'.$returnurl.'"><img src="'.$OUTPUT->pix_url('nav_exit', 'mod_book').
 164              '" class="icon" alt="'.get_string('navexit', 'book').'" /></a>';
 165  
 166      // we are cheating a bit here, viewing the last page means user has viewed the whole book
 167      $completion = new completion_info($course);
 168      $completion->set_module_viewed($cm);
 169  }
 170  
 171  // =====================================================
 172  // Book display HTML code
 173  // =====================================================
 174  
 175  echo $OUTPUT->header();
 176  echo $OUTPUT->heading($book->name);
 177  
 178  // upper nav
 179  echo '<div class="navtop">'.$chnavigation.'</div>';
 180  
 181  // chapter itself
 182  $hidden = $chapter->hidden ? ' dimmed_text' : null;
 183  echo $OUTPUT->box_start('generalbox book_content' . $hidden);
 184  
 185  if (!$book->customtitles) {
 186      if (!$chapter->subchapter) {
 187          $currtitle = book_get_chapter_title($chapter->id, $chapters, $book, $context);
 188          echo $OUTPUT->heading($currtitle, 3);
 189      } else {
 190          $currtitle = book_get_chapter_title($chapters[$chapter->id]->parent, $chapters, $book, $context);
 191          $currsubtitle = book_get_chapter_title($chapter->id, $chapters, $book, $context);
 192          echo $OUTPUT->heading($currtitle, 3);
 193          echo $OUTPUT->heading($currsubtitle, 4);
 194      }
 195  }
 196  $chaptertext = file_rewrite_pluginfile_urls($chapter->content, 'pluginfile.php', $context->id, 'mod_book', 'chapter', $chapter->id);
 197  echo format_text($chaptertext, $chapter->contentformat, array('noclean'=>true, 'overflowdiv'=>true, 'context'=>$context));
 198  
 199  echo $OUTPUT->box_end();
 200  
 201  // lower navigation
 202  echo '<div class="navbottom">'.$chnavigation.'</div>';
 203  
 204  echo $OUTPUT->footer();