books/book/lib/turn.html4.js

/**
 * turn.js 4th release HTML4 version
 * turnjs.com
 * turnjs.com/license.txt
 *
 * Copyright (C) 2012 Emmanuel Garcia
 * All rights reserved
 **/

(function($) {

'use strict';

var has3d,

  vendor = '',
  
  version = '4.1.0',

  isTouch = false,

  mouseEvents =
    {
      down: 'mousedown',
      move: 'mousemove',
      up: 'mouseup',
      over: 'mouseover',
      out: 'mouseout'
    },

  corners = {
    backward: ['l'],
    forward: ['r'],
    all: ['l', 'r']
  },

  // Display values

  displays = ['single', 'double'],

  // Direction values

  directions = ['ltr', 'rtl'],

  // Default options

  turnOptions = {

    // Enables hardware acceleration

    acceleration: true,

    // Display

    display: 'double',

    // Duration of transition in milliseconds

    duration: 600,

    // First page

    page: 1,
    
    // Enables gradients

    gradients: true,

    // Events

    when: null
  },

  flipOptions = {

    // Enables hardware acceleration

    acceleration: true,
    
    // Corners
    // backward: Activates both tl and bl corners
    // forward: Activates both tr and br corners
    // all: Activates all the corners

    corners: 'forward',
    
    // Size of the active zone of each corner

    cornerSize: 100,


    // Duration of transition in milliseconds

    duration: 600,
    
    // Enables gradients

    gradients: true

  },

  // Number of pages in the DOM, minimum value: 6

  pagesInDOM = 6,
  

turnMethods = {

  // Singleton constructor
  // $('#selector').turn([options]);

  init: function(opts) {

    if (this.length>1)
      throw turnError('This selector has more than 1 element');
    
    // Define constants
    
    vendor = getPrefix();

    var i, pageNum = 0, data = this.data(), ch = this.children();

    // Set initial configuration

    opts = $.extend({
      width: this.width(),
      height: this.height(),
      direction: this.attr('dir') || this.css('direction') || 'ltr'
    }, turnOptions, opts);

    data.opts = opts;
    data.pageObjs = {};
    data.pages = {};
    data.pageWrap = {};
    data.pagePlace = {};
    data.pageMv = [];
    data.zoom = 1;
    data.totalPages = opts.pages || 0;
    data.docEvents = {
      mouseStart: function(e) {
        for (var page in data.pages)
          if (has(page, data.pages) &&
            flipMethods._eventStart.call(data.pages[page], e)===false)
              return false;
      },

      mouseMove: function(e) {
        for (var page in data.pages)
          if (has(page, data.pages))
            flipMethods._eventMove.call(data.pages[page], e);
      },

      mouseEnd: function(e) {
        for (var page in data.pages)
          if (has(page, data.pages))
            flipMethods._eventEnd.call(data.pages[page], e);
      }
    };

    // Add event listeners

    if (opts.when)
      for (i in opts.when)
        if (has(i, opts.when))
          this.bind(i, opts.when[i]);

    // Set the css

    this.css({position: 'relative', width: opts.width, height: opts.height});

    // Set the initial display

    this.turn('display', opts.display);

    // Set the direction

    if (opts.direction!=='')
      this.turn('direction', opts.direction);


    // Add pages from the DOM

    for (i = 0; i<ch.length; i++) {
      if ($(ch[i]).attr('ignore')!='1') {
        this.turn('addPage', ch[i], ++pageNum);
      }
    }

    // Event listeners

    $(this).bind(mouseEvents.down, data.docEvents.mouseStart).
      bind('start', turnMethods._start).
      bind('end', turnMethods._end).
      bind('pressed', turnMethods._pressed).
      bind('released', turnMethods._released).
      bind('flip', turnMethods._flip);

    $(document).bind(mouseEvents.move, data.docEvents.mouseMove).
      bind(mouseEvents.up, data.docEvents.mouseEnd);

    // Set the initial page

    this.turn('page', opts.page);

    data.done = true;

    return this;
  },

  // Adds a page from external data

  addPage: function(element, page) {

    var currentPage,
      className,
      incPages = false,
      data = this.data(),
      lastPage = data.totalPages+1;

    if (data.destroying)
      return false;

    // Read the page number from the className of `element` - format: p[0-9]+

    if ((currentPage = /\bp([0-9]+)\b/.exec($(element).attr('class'))))
      page = parseInt(currentPage[1], 10);

    if (page) {
      
      if (page==lastPage)
        incPages = true;
      else if (page>lastPage)
        throw turnError('Page "'+page+'" cannot be inserted');

    } else {
      
      page = lastPage;
      incPages = true;

    }

    if (page>=1 && page<=lastPage) {

      if (data.display=='double')
        className = (page%2) ? ' odd' : ' even';
      else
        className = '';

      // Stop animations
      if (data.done)
        this.turn('stop');

      // Move pages if it's necessary
      if (page in data.pageObjs)
        turnMethods._movePages.call(this, page, 1);

      // Increase the number of pages
      if (incPages)
        data.totalPages = lastPage;

      // Add element
      data.pageObjs[page] = $(element).
        css({'float': 'left'}).
        addClass('page p' + page + className);

      // Add page
      turnMethods._addPage.call(this, page);


      // Update view
      if (data.done)
        this.turn('update');


      // Remove pages out of range
      turnMethods._removeFromDOM.call(this);
    }

    return this;
  },

  // Adds a page

  _addPage: function(page) {
    
    var data = this.data(),
      element = data.pageObjs[page];

    if (element)
      if (turnMethods._necessPage.call(this, page)) {

        if (!data.pageWrap[page]) {

          var prop = turnMethods._pageSize.call(this, page, true);

          element.css({width: prop.width, height: prop.height});

          // Place
          data.pagePlace[page] = page;

          // Wrapper
          data.pageWrap[page] = $('<div/>',
            {'class': 'turn-page-wrapper',
              page: page,
              css: {position: 'absolute',
              overflow: 'hidden'}}).
            css(prop);

          // Append to this
          this.append(data.pageWrap[page]);

          // Move element to wrapper
          data.pageWrap[page].prepend(data.pageObjs[page]);

        }

        // If the page is in the current view, create the flip effect
        if (!page || turnMethods._setPageLoc.call(this, page)==1)
          turnMethods._makeFlip.call(this, page);
        
      } else {

        // Place
        data.pagePlace[page] = 0;

        // Remove element from the DOM
        if (data.pageObjs[page])
          data.pageObjs[page].remove();

      }

  },

  // Checks if a page is in memory
  
  hasPage: function(page) {

    return has(page, this.data().pageObjs);
  
  },

  // Centers the flipbook

  center: function(page) {
    
    var data = this.data(),
      size = $(this).turn('size'),
      left = size.width/(data.zoom*2) -size.width/2;

    if (data.display=='double') {
      var view = this.turn('view', page || data.tpage || data.page);

      if (data.direction=='ltr') {
        if (!view[0])
          left -= size.width/4;
        else if (!view[1])
          left += size.width/4;
      } else {
        if (!view[0])
          left += size.width/4;
        else if (!view[1])
          left -= size.width/4;
      }
    }

    $(this).css({marginLeft: left});

    return this;

  },

  // Destroys the flipbook

  destroy: function () {

    var page,
      data = this.data();

    data.destroying = true;

    $(this).unbind(mouseEvents.down)
      .unbind('end')
      .unbind('first')
      .unbind('flip')
      .unbind('last')
      .unbind('pressed')
      .unbind('released')
      .unbind('start')
      .unbind('turning')
      .unbind('turned')
      .unbind('zooming');

    $(document).unbind(mouseEvents.move, data.docEvents.mouseMove).
      unbind(mouseEvents.up, data.docEvents.mouseEnd);
    
    while (data.totalPages!==0) {
      this.turn('removePage', data.totalPages);
    }

    if (data.fparent)
      data.fparent.remove();

    if (data.shadow)
      data.shadow.remove();

    this.removeData();
    data = null;

    return this;

  },

  // Checks if this element is a flipbook

  is: function() {

    return typeof(this.data().pages)=='object';

  },

  // Sets and gets the zoom value

  zoom: function(newZoom) {
    
    var data = this.data();

    if (typeof(newZoom)=='number') {

      if (newZoom<0.001 || newZoom>100)
        throw turnError(newZoom+ ' is not a value for zoom');
    
      var event = $.Event('zooming');
      this.trigger(event, [newZoom, data.zoom]);

      if (event.isDefaultPrevented())
        return this;
      
      var size = $(this).turn('size'),
        iz = 1/data.zoom,
        newWidth = Math.round(size.width * iz * newZoom),
        newHeight = Math.round(size.height * iz * newZoom);
    
      data.zoom = newZoom;

      $(this).turn('stop').
        turn('size', newWidth, newHeight).
        css({marginTop: size.height * iz / 2 - newHeight / 2});

      if (data.opts.autoCenter)
        this.turn('center');
      else
        $(this).css({marginLeft: size.width * iz / 2 - newWidth / 2});
      
      turnMethods._updateShadow.call(this);
  
      return this;

    } else
      return data.zoom;

  },

  // Gets the size of a page

  _pageSize: function(page, position) {

    var data = this.data(),
      prop = {};

    if (data.display=='single') {

      prop.width = this.width();
      prop.height = this.height();

      if (position) {
        prop.top = 0;
        prop.left = 0;
        prop.right = 'auto';
      }

    } else {

      var pageWidth = this.width()/2,
        pageHeight = this.height();

      if (data.pageObjs[page].hasClass('own-size')) {
        prop.width = data.pageObjs[page].width();
        prop.height = data.pageObjs[page].height();
      } else {
        prop.width = pageWidth;
        prop.height = pageHeight;
      }

      if (position) {
        var odd = page%2;
        prop.top = (pageHeight-prop.height)/2;

        if (data.direction=='ltr') {
          
          prop[(odd) ? 'right' : 'left'] = pageWidth-prop.width;
          prop[(odd) ? 'left' : 'right'] = 'auto';

        } else {
          
          prop[(odd) ? 'left' : 'right'] = pageWidth-prop.width;
          prop[(odd) ? 'right' : 'left'] = 'auto';

        }

      }
    }

    return prop;

  },

  // Prepares the flip effect for a page

  _makeFlip: function(page) {

    var data = this.data();

    if (!data.pages[page] && data.pagePlace[page]==page) {
      var corner,
        single = data.display=='single',
        odd = page%2;

      data.pages[page] = data.pageObjs[page].
        css(turnMethods._pageSize.call(this, page)).
        flip({page: page,
          next: (odd || single) ? page+1 : page-1,
          turn: this,
          duration: data.opts.duration,
          acceleration : data.opts.acceleration,
          gradients: data.opts.gradients
          }).
          flip('disable', data.disabled);
    }

    return data.pages[page];
  },

  // Makes pages within a range

  _makeRange: function() {

    var page, range,
      data = this.data();

    if (data.totalPages<1)
      return;

    range = this.turn('range');

    for (page = range[0]; page<=range[1]; page++)
      turnMethods._addPage.call(this, page);

  },

  // Returns a range of pages that should be in the DOM
  // Example:
  // - page in the current view, return true
  // * page is in the range, return true
  // Otherwise, return false
  //
  // 1 2-3 4-5 6-7 8-9 10-11 12-13
  //   **  **  --   **  **

  range: function(page) {

    var remainingPages, left, right, view,
      data = this.data();


      page = page || data.tpage || data.page || 1;
      view = turnMethods._view.call(this, page);

      if (page<1 || page>data.totalPages)
        throw turnError('"'+page+'" is not a page for range');
    
      view[1] = view[1] || view[0];
      
      if (view[0]>=1 && view[1]<=data.totalPages) {

        remainingPages = Math.floor((pagesInDOM-2)/2);

        if (data.totalPages-view[1] > view[0]) {
          left = Math.min(view[0]-1, remainingPages);
          right = 2*remainingPages-left;
        } else {
          right = Math.min(data.totalPages-view[1], remainingPages);
          left = 2*remainingPages-right;
        }

      } else {
        left = pagesInDOM-1;
        right = pagesInDOM-1;
      }

      return [Math.max(1, view[0]-left),
          Math.min(data.totalPages, view[1]+right)];

  },

  // Detects if a page is within the range of `pagesInDOM` from the current view

  _necessPage: function(page) {
    
    if (page===0)
      return true;

    var data = this.data(),
      range = this.turn('range');

    return data.pageObjs[page].hasClass('fixed') ||
      (page>=range[0] && page<=range[1]);
    
  },

  // Releases memory by removing pages from the DOM

  _removeFromDOM: function() {

    var page, data = this.data();

    for (page in data.pageWrap)
      if (has(page, data.pageWrap) &&
        !turnMethods._necessPage.call(this, page))
      turnMethods._removePageFromDOM.call(this, page);
    
  },

  // Removes a page from DOM and its internal references

  _removePageFromDOM: function(page) {

    var data = this.data();

    if (data.pages[page]) {
      var dd = data.pages[page].data();

      flipMethods._moveFoldingPage.call(data.pages[page], false);

      if (dd.f && dd.f.fwrapper)
        dd.f.fwrapper.remove();

      data.pages[page].removeData();
      data.pages[page].remove();
      delete data.pages[page];
    }

    if (data.pageObjs[page])
      data.pageObjs[page].remove();

    if (data.pageWrap[page]) {
      data.pageWrap[page].remove();
      delete data.pageWrap[page];
    }

    delete data.pagePlace[page];

  },

  // Removes a page

  removePage: function(page) {

    var data = this.data();

    if (page<1 || page>data.totalPages)
      throw turnError('The page '+ page + ' doesn\'t exist');
      
    if (data.pageObjs[page]) {

      // Stop animations
      this.turn('stop');

      // Remove `page`
      turnMethods._removePageFromDOM.call(this, page);
      delete data.pageObjs[page];

    }

    // Move the pages behind `page`
    turnMethods._movePages.call(this, page, -1);

    // Resize the size of this flipbook
    data.totalPages = data.totalPages-1;

    // Check the current view

    if (data.page>data.totalPages)
      this.turn('page', data.totalPages);
    else
      turnMethods._makeRange.call(this);

    return this;
  
  },

  // Moves pages

  _movePages: function(from, change) {

    var page,
      that = this,
      data = this.data(),
      single = data.display=='single',
      move = function(page) {

        var next = page + change,
          odd = next%2,
          className = (odd) ? ' odd ' : ' even ';

        if (data.pageObjs[page])
          data.pageObjs[next] = data.pageObjs[page]
            .removeClass('p' + page + ' odd even')
            .addClass('p' + next + className);

        if (data.pagePlace[page] && data.pageWrap[page]) {
          data.pagePlace[next] = next;
        
        if (data.pageObjs[next].hasClass('fixed'))
          data.pageWrap[next] = data.pageWrap[page]
            .attr('page', next);
        else
          data.pageWrap[next] = data.pageWrap[page].
            css(turnMethods._pageSize.call(that, next, true)).
            attr('page', next);
    
          if (data.pages[page])
            data.pages[next] = data.pages[page]
              .flip('options', {
                page: next,
                next: (single || odd) ? next+1 : next-1,
                corners: (single) ? 'all' :
                  ((odd) ? 'forward' : 'backward')
              });

          if (change) {
            delete data.pages[page];
            delete data.pagePlace[page];
            delete data.pageObjs[page];
            delete data.pageWrap[page];
            delete data.pageObjs[page];
          }
      }
    };

    if (change>0)
      for (page=data.totalPages; page>=from; page--)
        move(page);
    else
      for (page=from; page<=data.totalPages; page++)
        move(page);

  },

  // Sets or Gets the display mode

  display: function(display) {

    var data = this.data(),
      currentDisplay = data.display;

    if (display) {

      if ($.inArray(display, displays)==-1)
        throw turnError('"'+display + '" is not a value for display');
      
      if (display=='single') {
        if (!data.pageObjs[0]) {

          this.turn('stop').
            css({'overflow': 'hidden'});

          data.pageObjs[0] = $('<div />',
              {'class': 'page p-temporal'}).
            css({width: this.width(), height: this.height()}).
            appendTo(this);

        }
      } else {
        if (data.pageObjs[0]) {
          this.turn('stop').css({'overflow': ''});
          data.pageObjs[0].remove();
          delete data.pageObjs[0];
        }
      }

      data.display = display;

      if (currentDisplay) {
        var size = this.turn('size');
        turnMethods._movePages.call(this, 1, 0);
        this.turn('size', size.width, size.height).
          turn('update');
      }

      return this;

    } else
      return currentDisplay;
  
  },

  // Gets and sets the direction of the flipbook

  direction: function(dir) {

    var data = this.data();

    if (typeof(dir)=='undefined') {

      return data.direction;

    } else {

      dir = dir.toLowerCase();

      if ($.inArray(dir, directions)==-1)
        throw turnError('"' + dir + '" is not a value for direction');

      if (dir=='rtl') {
        $(this).attr('dir', 'ltr').
          css({direction: 'ltr'});
      }

      data.direction = dir;

      if (data.done)
        this.turn('size', $(this).width(), $(this).height());

      return this;
    }

  },

  // Detects if the pages are being animated

  animating: function() {

    return this.data().pageMv.length>0;

  },

  // Disables and enables the effect

  disable: function(bool) {

    var page,
      data = this.data(),
      view = this.turn('view');

      data.disabled = bool===undefined || bool===true;

    for (page in data.pages)
      if (has(page, data.pages))
        data.pages[page].flip('disable', (bool) ? $.inArray(page, view) : false);

    return this;

  },

  // Disables and enables the effect

  disabled: function(disable) {

    if (disable===undefined) {
      return this.data().disabled===true;
    } else {
      return this.turn('disable', disable);
    }

  },

  // Gets and sets the size

  size: function(width, height) {

    if (width && height) {

      var page, prop,
        data = this.data(),
        pageWidth = (data.display=='double') ? width/2 : width;

      this.css({width: width, height: height});

      if (data.pageObjs[0])
        data.pageObjs[0].css({width: pageWidth, height: height});
      
      for (page in data.pageWrap) {
        if (!has(page, data.pageWrap)) continue;

        prop = turnMethods._pageSize.call(this, page, true);

        data.pageObjs[page].css({width: prop.width, height: prop.height});
        data.pageWrap[page].css(prop);

        if (data.pages[page])
          data.pages[page].css({width: prop.width, height: prop.height});
      }

      this.turn('resize');

      return this;

    } else {
      
      return {width: this.width(), height: this.height()};

    }
  },

  // Resizes each page

  resize: function() {

    var page, data = this.data();

    if (data.pages[0]) {
      data.pageWrap[0].css({left: -this.width()});
      data.pages[0].flip('resize', true);
    }

    for (page = 1; page <= data.totalPages; page++)
      if (data.pages[page])
        data.pages[page].flip('resize', true);


  },

  // Removes an animation from the cache

  _removeMv: function(page) {

    var i, data = this.data();
      
    for (i=0; i<data.pageMv.length; i++)
      if (data.pageMv[i]==page) {
        data.pageMv.splice(i, 1);
        return true;
      }

    return false;

  },

  // Adds an animation to the cache
  
  _addMv: function(page) {

    var data = this.data();

    turnMethods._removeMv.call(this, page);
    data.pageMv.push(page);

  },

  // Gets indexes for a view

  _view: function(page) {
  
    var data = this.data();
    
    page = page || data.page;

    if (data.display=='double')
      return (page%2) ? [page-1, page] : [page, page+1];
    else
      return [page];

  },

  // Gets a view

  view: function(page) {

    var data = this.data(),
      view = turnMethods._view.call(this, page);

    if (data.display=='double')
      return [(view[0]>0) ? view[0] : 0,
        (view[1]<=data.totalPages) ? view[1] : 0];
    else
      return [(view[0]>0 && view[0]<=data.totalPages) ? view[0] : 0];

  },

  // Stops animations

  stop: function(ignore, animate) {

    if (this.turn('animating')) {
      var i, opts, page,
        data = this.data(),
        pages = data.pageMv;

      data.pageMv = [];

      if (data.tpage) {
        data.page = data.tpage;
        delete data['tpage'];
      }

      for (i = 0; i<pages.length; i++) {

        page = data.pages[pages[i]];
        opts = page.data().f.opts;

        page.flip('hideFoldedPage', false);

        flipMethods._moveFoldingPage.call(page, false);

        data.pagePlace[opts.next] = opts.next;

        if (opts.force) {
          opts.next = (opts.page%2===0) ? opts.page-1 : opts.page+1;
          delete opts['force'];
        }
      }
    }

    this.turn('update');

    return this;
  
  },

  // Gets and sets the number of pages

  pages: function(pages) {

    var data = this.data();

    if (pages) {
      if (pages<data.totalPages) {

        for (var page = pages+1; page<=data.totalPages; page++)
          this.turn('removePage', page);

        if (this.turn('page')>pages)
          this.turn('page', pages);
      }

      data.totalPages = pages;

      return this;
    } else
      return data.totalPages;

  },

  // Checks missing pages

  _missing : function(page) {
    
    var p,
      data = this.data(),
      range = this.turn('range', page),
      missing = [];

    for (p = range[0]; p<=range[1]; p++) {
      if (!data.pageObjs[p])
        missing.push(p);
    }

    if (missing.length>0)
      this.trigger('missing', [missing]);
    
  },

  // Sets a page without effect

  _fitPage: function(page) {

    var data = this.data(),
      newView = this.turn('view', page);
    
    turnMethods._missing.call(this, page);

    if (!data.pageObjs[page])
      return;

    data.page = page;

    this.turn('stop');
    turnMethods._removeFromDOM.call(this);
    turnMethods._makeRange.call(this);
    turnMethods._updateShadow.call(this);
    this.trigger('turned', [page, newView]);

    if (data.opts.autoCenter)
      this.turn('center');

  },
  
  // Turns to a page

  _turnPage: function(page, fromMouseAction) {

    var current, next,
      data = this.data(),
      place = data.pagePlace[page],
      view = this.turn('view'),
      newView = this.turn('view', page);
  
    if (data.page!=page) {

      var event = $.Event('turning');
      this.trigger(event, [page, newView]);

      if (event.isDefaultPrevented())
        return;

      if ($.inArray(1, newView)!=-1)
        this.trigger('first');
      if ($.inArray(data.totalPages, newView)!=-1)
        this.trigger('last');

    }



    if (fromMouseAction) {

      this.turn('stop', place);

    } else {

      turnMethods._missing.call(this, page);
      
      if (!data.pageObjs[page])
        return;

      this.turn('stop');
      data.page = page;
    }
    

    turnMethods._makeRange.call(this);

    if (data.display=='single') {
      current = view[0];
      next = newView[0];
    } else if (view[1] && page>view[1]) {
      current = view[1];
      next = newView[0];
    } else if (view[0] && page<view[0]) {
      current = view[0];
      next = newView[1];
    }

    if (data.pages[current]) {

      var opts = data.pages[current].data().f.opts;
      data.tpage = next;
      
      if (opts.next!=next) {
        opts.next = next;
        data.pagePlace[next] = opts.page;
        opts.force = true;
      }

      if (data.display=='single') {

        if (data.direction=='ltr') {
          data.pages[current].flip('turnPage',
            (newView[0] > view[0]) ? 'r' : 'l');
        } else {
          data.pages[current].flip('turnPage',
            (newView[0] > view[0]) ? 'l' : 'r');
        }

      } else {
        
        data.pages[current].flip('turnPage');

      }
    }

  },

  // Gets and sets a page

  page: function(page) {

    page = parseInt(page, 10);

    var data = this.data();

    if (page>0 && page<=data.totalPages) {
      if (!data.done || $.inArray(page, this.turn('view'))!=-1)
        turnMethods._fitPage.call(this, page);
      else
        turnMethods._turnPage.call(this, page);
    
      return this;

    } else
      return data.page;
  
  },

  // Turns to the next view

  next: function() {

    return this.turn('page',
      turnMethods._view.call(this, this.data().page).pop() + 1);
  
  },

  // Turns to the previous view

  previous: function() {
    
    return this.turn('page',
      turnMethods._view.call(this, this.data().page).shift() - 1);

  },

  peel: function(corner, animate) {
    
    return this;

  },

  // Adds a motion to the internal list
  // This event is called in context of flip

  _addMotionPage: function() {

    var opts = $(this).data().f.opts,
      turn = opts.turn,
      dd = turn.data();

    turnMethods._addMv.call(turn, opts.page);
    dd.pagePlace[opts.next] = opts.page;
    turn.turn('update');

  },

  // This event is called in context of flip

  _start: function(e, opts, corner) {

    var data = opts.turn.data();

    if (e.isDefaultPrevented()) {
      turnMethods._updateShadow.call(opts.turn);
      return;
    }

    if (data.display=='single' && corner) {

      if ((corner=='l' && data.direction=='ltr')
        ||
        (corner=='r' && data.direction=='rtl'))
      {
        
        opts.next = (opts.next<opts.page) ? opts.next : opts.page-1;
        opts.force = true;

      } else {

        opts.next = (opts.next>opts.page) ? opts.next : opts.page+1;

      }

    }

    turnMethods._addMotionPage.call(e.target);
    turnMethods._updateShadow.call(opts.turn);
  },

  // This event is called in context of flip

  _end: function(e, opts, turned) {

    var that = $(e.target),
      data = that.data().f,
      turn = opts.turn,
      dd = turn.data();

    if (turned || dd.tpage) {

      if (dd.tpage==opts.next || dd.tpage==opts.page) {
        delete dd['tpage'];
        turnMethods._fitPage.call(turn, dd.tpage || opts.next, true);
      }

    } else {

      turnMethods._removeMv.call(turn, opts.page);
      turnMethods._updateShadow.call(turn);
      turn.turn('update');

    }
    
  },
  
  // This event is called in context of flip

  _pressed: function(e) {

    e.stopPropagation();

    var page,
      data = $(e.target).data().f,
      pages = data.opts.turn.data().pages;

    for (page in pages)
      if (page!=data.opts.page)
        pages[page].flip('disable', true);

    return data.time = new Date().getTime();

  },

  // This event is called in context of flip

  _released: function(e, point) {

    e.stopPropagation();

    var outArea,
      page = $(e.target),
      data = page.data().f,
      turn = data.opts.turn,
      turnData = turn.data();
    
    if (turnData.display=='single') {
      outArea = (point.corner=='r') ?
        point.x<page.width()/2:
        point.x>page.width()/2;
    } else {
      outArea = point.x<0 || point.x>page.width();
    }

    if ((new Date()).getTime()-data.time<200 || outArea) {

      e.preventDefault();

      turnMethods._turnPage.call(
        turn,
        data.opts.next,
        flipMethods._cornerActivated.call(page, point, 1) === false
      );

    }

    turnData.mouseAction = false;

  },

  // This event is called in context of flip
  
  _flip: function(e) {

    e.stopPropagation();

    var opts = $(e.target).data().f.opts;

    opts.turn.trigger('turn', [opts.next]);

    if (opts.turn.data().opts.autoCenter)
      opts.turn.turn('center', opts.next);

  },

  // Calculate the z-index value for pages during the animation

  calculateZ: function(mv) {

    var i, page, nextPage, placePage, dpage,
      that = this,
      data = this.data(),
      view = this.turn('view'),
      currentPage = view[0] || view[1],
      r = {pageZ: {}, partZ: {}, pageV: {}},

      addView = function(page) {
        var view = that.turn('view', page);
        if (view[0]) r.pageV[view[0]] = true;
        if (view[1]) r.pageV[view[1]] = true;
      };
    
    for (i = 0; i<mv.length; i++) {
      page = mv[i];
      nextPage = data.pages[page].data().f.opts.next;
      placePage = data.pagePlace[page];
      addView(page);
      addView(nextPage);
      dpage = (data.pagePlace[nextPage]==nextPage) ? nextPage : page;
      r.pageZ[dpage] = data.totalPages - Math.abs(currentPage-dpage);
      r.partZ[placePage] = data.totalPages*2 + Math.abs(currentPage-dpage);
    }

    return r;
  },

  // Updates the z-index and display property of every page

  update: function() {

    var page,
      data = this.data();

    if (data.pageMv.length && data.pageMv[0]!==0) {

      // Update motion

      var p,
        fixed,
        pos = this.turn('calculateZ', data.pageMv),
        view = this.turn('view', data.tpage);
    
      for (page in data.pageWrap) {

        if (!has(page, data.pageWrap))
          continue;

        fixed = data.pageObjs[page].hasClass('fixed');

        data.pageWrap[page].css({
          display: (pos.pageV[page] || fixed) ? '' : 'none',
          'z-index': pos.pageZ[page] || ((fixed) ? -1 : 0)
        });

        if ((p = data.pages[page])) {
          p.flip('z', pos.partZ[page] || null);

          if (pos.pageV[page])
            p.flip('resize');

          if (data.tpage)
            p.flip('disable', true); // data.disabled || page!=apage
        }
      }
  
    } else {

      // Update static pages

      for (page in data.pageWrap) {

        if (!has(page, data.pageWrap))
          continue;

        var pageLocation = turnMethods._setPageLoc.call(this, page);

        if (data.pages[page])
          data.pages[page].flip('disable',
            data.disabled || pageLocation!=1).flip('z', null);

      }
    }
  },

  // Updates the position and size of the flipbook's shadow

  _updateShadow: function() {
    
    var view, view2, shadow,
      data = this.data(),
      width = this.width(),
      height = this.height(),
      pageWidth = (data.display=='single') ? width : width/2;

    view = this.turn('view');

    if (!data.shadow) {
      data.shadow = $('<div />',
      {
        'class': 'shadow',
        'css': divAtt(0, 0, 0).css
      }).
      appendTo(this);
    }

    for (var i = 0; i<data.pageMv.length; i++) {
      if (!view[0] || !view[1])
        break;
    
      view = this.turn('view', data.pages[data.pageMv[i]].data().f.opts.next);
      view2 = this.turn('view', data.pageMv[i]);

      view[0] = view[0] && view2[0];
      view[1] = view[1] && view2[1];
    }

    if (!view[0]) shadow = (data.direction=='ltr') ? 1 : 2;
    else if (!view[1]) shadow = (data.direction=='ltr') ? 2 : 1;
    else shadow = 3;

    switch (shadow) {
      case 1:
        data.shadow.css({
          width: pageWidth,
          height: height,
          top: 0,
          left: pageWidth
        });
        break;
      case 2:
        data.shadow.css({
          width: pageWidth,
          height: height,
          top: 0,
          left: 0
        });
        break;
      case 3:
        data.shadow.css({
          width: width,
          height: height,
          top: 0,
          left: 0
        });
        break;
    }

  },

  // Sets the z-index and display property of a page
  // It depends on the current view

  _setPageLoc: function(page) {

    var data = this.data(),
      view = this.turn('view');

    if (page==view[0] || page==view[1]) {
      
      data.pageWrap[page].css({zIndex: data.totalPages, display: ''});
      return 1;

    } else if ((data.display=='single' && page==view[0]+1) ||
      (data.display=='double' && page==view[0]-2 ||
      page==view[1]+2)) {
      
      data.pageWrap[page].css({zIndex: data.totalPages-1, display: ''});
      return 2;

    } else {
      
      data.pageWrap[page].css({zIndex: 0,
        display: (data.pageObjs[page].hasClass('fixed')) ? '' : 'none'}
      );

      return 0;
    }
  },

  // Gets and sets the options

  options: function(options) {
    
    if (options===undefined) {
      
      return this.data().opts;

    } else {

      var data = this.data();

      // Set new values

      $.extend(data.opts, options);
      
      // Set pages

      if (options.pages)
        this.turn('pages', options.pages);

      // Set page

      if (options.page)
        this.turn('page', options.page);

      // Set display

      if (options.display)
        this.turn('display', options.display);
      
      // Set direction

      if (options.direction)
        this.turn('direction', options.direction);

      // Set size

      if (options.width && options.height)
        this.turn('size', options.width, options.height);
      
      // Add event listeners

      if (options.when)
        for (var eventName in options.when)
          if (has(eventName, options.when)) {
            this.unbind(eventName).
              bind(eventName, options.when[eventName]);
          }

      return this;
    }

  },

  // Gets the current version

  version: function() {

    return version;

  }
},

// Methods and properties for the flip page effect

flipMethods = {

  // Constructor

  init: function(opts) {

    this.data({f:
      {effect: (opts.corners=='r' || opts.corners=='l') ? 'hard' : 'sheet'}}
    );

    this.flip('options', opts);

    flipMethods._addPageWrapper.call(this);

    return this;
  },

  setData: function(d) {
    
    var data = this.data();

    data.f = $.extend(data.f, d);

    return this;
  },

  options: function(opts) {
    
    var data = this.data().f;

    if (opts) {
      flipMethods.setData.call(this,
        {opts: $.extend({}, data.opts || flipOptions, opts)});
      return this;
    } else
      return data.opts;

  },

  z: function(z) {

    var data = this.data().f;

    if (data.fwrapper) {
      data.opts['z-index'] = z;
      data.fwrapper.css(
        {'z-index': z || parseInt(data.parent.css('z-index'), 10) || 0}
      );
    }

    return this;
  },

  _cAllowed: function() {
    
    var data = this.data().f,
    turnData = data.opts.turn.data(),
    page = data.opts.page,
    odd = page%2;

    if (turnData.display=='single') {
      if (page==1)
        return (turnData.direction=='ltr') ?
          corners['forward'] : corners['backward'];
      else if (page==turnData.totalPages)
        return (turnData.direction=='ltr') ?
          corners['backward'] : corners['forward'];
      else
        return corners['all'];
    } else {

      return (turnData.direction=='ltr') ?
        corners[(odd) ? 'forward' : 'backward']
        :
        corners[(odd) ? 'backward' : 'forward'];

    }

  },

  _cornerActivated: function(e) {
  
  
    var data = this.data().f,
      pos = data.parent.offset(),
      width = this.width(),
      height = this.height(),
      c = {x: Math.max(0, e.pageX-pos.left), y: Math.max(0, e.pageY-pos.top)},
      csz = data.opts.cornerSize;

    if (c.x<=0 || c.y<=0 || c.x>=width || c.y>=height)
      return false;

    var allowedCorners = flipMethods._cAllowed.call(this);

    if (c.x>width-csz)
      c.corner = 'r';
    else if (c.x<csz)
      c.corner = 'l';
    else
      return false;


    return ($.inArray(c.corner, allowedCorners)==-1) ? false : c;

  },

  _c: function(corner, opts) {

    opts = opts || 0;

    switch (corner) {
      case 'l':
        return point2D(opts, 0);
      case 'r':
        return point2D(this.width()-opts, 0);
    }

  },

  _c2: function(corner) {

    switch (corner) {
      case 'l':
        return point2D(this.width()*2, 0);
      case 'r':
        return point2D(-this.width(), 0);
    }

  },

  _foldingPage: function(corner) {

    var data = this.data().f,
      opts = data.opts;

    if (data.folding) return data.folding;
    else if(opts.turn) {

      data = opts.turn.data();
      if (data.display == 'single')
        return (data.pageObjs[opts.next]) ? data.pageObjs[0] : null;
      else
        return data.pageObjs[opts.next];
    }

  },

  _backGradient: function() {

    var data = this.data().f,
      turn = data.opts.turn,
      gradient = data.opts.gradients &&
        (!turn ||
        turn.data().display=='single' ||
        (data.opts.page!=2 && data.opts.page!=turn.data().totalPages-1));


    return gradient;

  },

  resize: function(full) {
    
    var data = this.data().f,
      width = this.width(),
      height = this.height();


    if (full) {
      data.wrapper.css({width: width, height: height});
      data.fpage.css({width: width, height: height});
    }

  },

  // Prepares the page by adding a general wrapper and another objects

  _addPageWrapper: function() {

    var att,
      data = this.data().f,
      parent = this.parent();

    data.parent = parent;

    if (!data.wrapper) {
        
      var cssProperties = {};

      data.wrapper = $('<div/>', divAtt(0, 0, 2)).
        css(cssProperties).
        appendTo(parent).
        prepend(this);

      data.fpage = $('<div/>', divAtt(0, 0, 1)).
        css(cssProperties).
        appendTo(parent);

    }

    // Set size
    flipMethods.resize.call(this, true);

  },

  // Takes a 2P point from the screen and applies the transformation

  _fold: function(point) {

    var data = this.data().f,
      o = flipMethods._c.call(this, point.corner),
      relX = (o.x) ? o.x - point.x :  point.x,
      width = this.width(),
      height = this.height();

      relX = Math.min(width*2, Math.max(0, relX));


      switch(point.corner) {
        case 'r' :
          data.wrapper.css({
            width: Math.max(0, width-relX)
          });
          this.css({
            position: 'relative',
            left: -relX
          });

          data.fpage.css({
            left: -relX + width,
            width: Math.max(0, relX-width)
          });
        break;
        case 'l' :

          data.wrapper.css({
            width: width
          });
          this.css({
            position: 'relative',
            left: relX
          });

          data.fpage.css({
            left: width,
            width: Math.max(0, relX-width)
          });

          if (data.folding)
            data.folding.css({
              position: 'relative',
              left: -width*2 + relX
            });
        
        break;
      }

      data.parent.css({'overflow': 'visible'});

    data.point = point;
  
  },

  _moveFoldingPage: function(bool) {

    var data = this.data().f;
      
    if (bool) {
      
      var folding = flipMethods._foldingPage.call(this),
        turn = data.opts.turn;
      
      if (folding) {

        if (data.folding) {
          if (data.folding===folding)
            return;
          flipMethods._moveFoldingPage.call(this, false);
        }
      
        flipMethods.setData.call(this,
          {backParent: folding.parent(),
          folding: folding});

        data.fpage.prepend(folding);

      }

      turn.turn('update');

    } else {
      if (data.backParent) {
        data.backParent.prepend(data.folding);
        delete data.backParent;
        delete data.folding;
      }
    }
  },

  _showFoldedPage: function(c, animate) {

    var folding = flipMethods._foldingPage.call(this),
      dd = this.data(),
      data = dd.f,
      visible = data.visible;

    if (!visible || !data.point || data.point.corner!=c.corner) {
      
      var mAction = data.opts.turn.data().mouseAction;

      var event = $.Event('start');
      this.trigger(event, [data.opts, c.corner]);
      visible = false;

      if (event.isDefaultPrevented())
        return false;

    }

    if (folding) {

      if (animate) {
        
        var that = this,
          point = (data.point && data.point.corner==c.corner) ?
          data.point : flipMethods._c.call(this, c.corner, 1);
      
        this.animatef({from: [point.x, point.y],
          to: [c.x, c.y],
          duration: 500,
          frame: function(v) {
            c.x = Math.round(v[0]);
            c.y = Math.round(v[1]);
            flipMethods._fold.call(that, c);
          }});

      } else  {

        flipMethods._fold.call(this, c);
        if (dd.effect && !dd.effect.turning)
          this.animatef(false);

      }

      if (!visible) {

        data.visible = true;
        flipMethods._moveFoldingPage.call(this, true);
        data.fpage.show();
      }

      return true;
    }

    return false;
  },

  hide: function() {

    var data = this.data().f,
      folding = flipMethods._foldingPage.call(this);

    this.css({
      position: '',
      left: 'auto'
    });

    data.wrapper.css({
      width: this.width()
    });

    data.fpage.css({
      width: this.width()
    });

    if (data.folding)
      data.folding.css({
        position: '',
        left: 'auto'
      });

    data.fpage.hide();

    data.visible = false;

    return this;
  },

  hideFoldedPage: function(animate) {

    var data = this.data().f;

    if (!data.point) return;

    var that = this,
      p1 = data.point,
      hide = function() {
        data.point = null;
        that.flip('hide');
        that.trigger('end', [data.opts, false]);
      };

    if (animate) {
      var p4 = flipMethods._c.call(this, p1.corner),
        top = (p1.corner.substr(0,1)=='t'),
        delta = (top) ? Math.min(0, p1.y-p4.y)/2 : Math.max(0, p1.y-p4.y)/2,
        p2 = point2D(p1.x, p1.y+delta),
        p3 = point2D(p4.x, p4.y-delta);
    
      this.animatef({
        from: 0,
        to: 1,
        frame: function(v) {
          var np = bezier(p1, p2, p3, p4, v);
          p1.x = np.x;
          p1.y = np.y;
          flipMethods._fold.call(that, p1);
        },
        complete: hide,
        duration: 800,
        hiding: true
        });

    } else {
      this.animatef(false);
      hide();
    }
  },

  turnPage: function(corner) {

    var that = this,
      data = this.data().f;

    corner = {corner: (data.corner) ?
      data.corner.corner :
      corner || flipMethods._cAllowed.call(this)[0]};

    var p1 = data.point ||
      flipMethods._c.call(this,
        corner.corner,
        (data.opts.turn) ? data.opts.turn.data().opts.elevation : 0),
      p4 = flipMethods._c2.call(this, corner.corner);

      this.trigger('flip').
        animatef({
          from: 0,
          to: 1,
          frame: function(v) {
            var np = bezier(p1, p1, p4, p4, v);
            corner.x = np.x;
            corner.y = np.y;

            flipMethods._showFoldedPage.call(that, corner);
          },
          
          complete: function() {
            that.trigger('end', [data.opts, true]);
          },
          duration: data.opts.duration,
          turning: true
        });

      data.corner = null;
  },

  moving: function() {

    return 'effect' in this.data();
  
  },

  isTurning: function() {

    return this.flip('moving') && this.data().effect.turning;
  
  },

  _eventStart: function(e) {

    var data = this.data().f;

    if (!data.disabled && !this.flip('isTurning')) {

      data.corner = flipMethods._cornerActivated.call(this, e);
    
      if (data.corner && flipMethods._foldingPage.call(this, data.corner)) {
      
        if (flipMethods._showFoldedPage.call(this, data.corner))
          this.trigger('pressed', [data.point]);

        return false;

      } else
        data.corner = null;

    }

  },

  _eventMove: function(e) {

    var data = this.data().f;

    if (!data.disabled) {

      e = (isTouch) ? e.originalEvent.touches : [e];
    
      if (data.corner) {

        var pos = data.parent.offset();
        data.corner.x = e[0].pageX-pos.left;
        data.corner.y = e[0].pageY-pos.top;
        flipMethods._showFoldedPage.call(this, data.corner);

      } else if (!this.data().effect && this.is(':visible')) {
    

        var corner = flipMethods._cornerActivated.call(this, e[0]);

        if (corner) {
          var origin = flipMethods._c.call(this, corner.corner, data.opts.cornerSize/2);
          corner.x = origin.x;
          corner.y = origin.y;
          flipMethods._showFoldedPage.call(this, corner, true);
        } else
          flipMethods.hideFoldedPage.call(this, true);
               

      }
    }
  },

  _eventEnd: function() {

    var data = this.data().f;

    if (!data.disabled && data.point) {
      var event = $.Event('released');
      this.trigger(event, [data.point]);
      if (!event.isDefaultPrevented())
        flipMethods.hideFoldedPage.call(this, true);
    }

    data.corner = null;

  },

  disable: function(disable) {

    flipMethods.setData.call(this, {'disabled': disable});
    return this;

  }
};



// Processes classes

function decorator(that, methods, args) {

  if (!args[0] || typeof(args[0])=='object')
    return methods.init.apply(that, args);

  else if (methods[args[0]])
    return methods[args[0]].apply(that, Array.prototype.slice.call(args, 1));

  else
    throw turnError(args[0] + ' is an invalid value');
}


// Attributes for a layer

function divAtt(top, left, zIndex, overf) {
    
  return {'css': {
        position: 'absolute',
        top: top,
        left: left,
        'overflow': overf || 'hidden',
        'z-index': zIndex || 'auto'
        }
    };
      
}

// Gets a 2D point from a bezier curve of four points

function bezier(p1, p2, p3, p4, t) {

  var a = 1 - t,
    b = a * a * a,
    c = t * t * t;
    
  return point2D(Math.round(b*p1.x + 3*t*a*a*p2.x + 3*t*t*a*p3.x + c*p4.x),
    Math.round(b*p1.y + 3*t*a*a*p2.y + 3*t*t*a*p3.y + c*p4.y));

}

// Gets a 2D point

function point2D(x, y) {
  
  return {x: x, y: y};

}

// Checks if a property belongs to an object

function has(property, object) {
  
  return Object.prototype.hasOwnProperty.call(object, property);

}

// Gets the CSS3 vendor prefix

function getPrefix() {

  var vendorPrefixes = ['Moz','Webkit','Khtml','O','ms'],
  len = vendorPrefixes.length,
  vendor = '';

  while (len--)
    if ((vendorPrefixes[len] + 'Transform') in document.body.style)
      vendor='-'+vendorPrefixes[len].toLowerCase()+'-';

  return vendor;

}

// JS Errors

function turnError(message) {

  function TurnJsError(message) {
    this.name = "TurnJsError";
    this.message = message;
  }

  TurnJsError.prototype = new Error();
  TurnJsError.prototype.constructor = TurnJsError;

  return new TurnJsError(message);
}

// Find the offset of an element discarding its transformation

function findPos(obj) {
  var offset = {top: 0, left: 0};

  do{
    offset.left += obj.offsetLeft;
    offset.top += obj.offsetTop;
  } while ((obj = obj.offsetParent));

  return offset;
}


// Request an animation

window.requestAnim = function(callback) {
  window.setTimeout(callback, 1000 / 60);
}


function emptyFunction() {
  return '';
}


// Extend $.fn

$.extend($.fn, {

  flip: function(req, opts) {
    return decorator(this, flipMethods, arguments);
  },

  turn: function(req) {
    return decorator(this, turnMethods, arguments);
  },

  transform: function(transform, origin) {

    var properties = {};
    
    if (origin)
      properties[vendor+'transform-origin'] = origin;
    
    properties[vendor+'transform'] = transform;
  
    return this.css(properties);

  },

  animatef: function(point) {

    var data = this.data();

    if (data.effect)
      data.effect.stop();

    if (point) {

      if (!point.to.length) point.to = [point.to];
      if (!point.from.length) point.from = [point.from];

      var diff = [],
        len = point.to.length,
        animating = true,
        that = this,
        time = (new Date()).getTime(),
        frame = function() {

          if (!data.effect || !animating)
            return;

          var v = [],
            timeDiff = Math.min(point.duration, (new Date()).getTime() - time);

          for (var i = 0; i < len; i++)
            v.push(data.effect.easing(1, timeDiff, point.from[i], diff[i], point.duration));

          point.frame((len==1) ? v[0] : v);

          if (timeDiff==point.duration) {
            delete data['effect'];
            that.data(data);
            if (point.complete)
              point.complete();
          } else {
            window.requestAnim(frame);
          }
        };

      for (var i = 0; i < len; i++)
        diff.push(point.to[i] - point.from[i]);

      data.effect = $.extend({
        stop: function() {
          animating = false;
        },
        easing: function (x, t, b, c, data) {
          return c * Math.sqrt(1 - (t=t/data-1)*t) + b;
        }
      }, point);

      this.data(data);

      frame();

    } else {
      
      delete data['effect'];

    }
  }
});

// Export some globals

$.isTouch = isTouch;
$.mouseEvents = mouseEvents;
$.cssPrefix = emptyFunction;
$.cssTransitionEnd = emptyFunction;
$.findPos = findPos;

})(jQuery);