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jquery.ui.rcarousel.js
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jquery.ui.rcarousel.js
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(function ($) {
$.widget("ui.rcarousel", {
_create: function() {
var data,
$root = $( this.element ),
_self = this,
options = this.options;
// if options were default there should be no problem
// check if user set options before init: $('element').rcarousel({with: "foo", visible: 3});
// in above example exception will be thrown because 'with' should be a number!
this._checkOptionsValidity( this.options );
// for every carousel create a data object and keeps it in the element
this._createDataObject();
data = $root.data( "data" );
// create wrapper inside root element; this is needed for animating
$root
.addClass( "ui-carousel" )
.children()
.wrapAll( "<div class='wrapper'></div>" );
// save all children of root element in ‘paths’ array
this._saveElements();
// make pages using paginate algorithm
this._generatePages();
this._loadElements();
this._setCarouselWidth();
this._setCarouselHeight();
// handle default event handlers
$( options.navigation.next ).click(
function( event ) {
_self.next();
event.preventDefault();
}
);
$( options.navigation.prev ).click(
function( event ) {
_self.prev();
event.preventDefault();
}
);
data.navigation.next = $( options.navigation.next );
data.navigation.prev = $( options.navigation.prev );
// stop on hover feature
$root.hover(
function() {
if ( options.auto.enabled ) {
clearInterval( data.interval );
data.hoveredOver = true;
}
},
function() {
if ( options.auto.enabled ) {
data.hoveredOver = false;
_self._autoMode( options.auto.direction );
}
}
);
this._setStep();
// if auto mode is enabled run it
if ( options.auto.enabled ) {
this._autoMode( options.auto.direction );
}
// broadcast event
this._trigger( "start" );
},
_addElement: function( jQueryElement, direction ) {
var $root = $( this.element ),
$content = $root.find( "div.wrapper" ),
options = this.options;
jQueryElement
.width( options.width )
.height( options.height );
if ( options.orientation === "horizontal" ) {
$( jQueryElement ).css( "marginRight", options.margin );
} else {
$( jQueryElement ).css({
marginBottom: options.margin,
"float": "none"
});
}
if ( direction === "prev" ) {
// clone event handlers and data as well
$content.prepend( jQueryElement.clone(true, true) );
} else {
$content.append( jQueryElement.clone(true, true) );
}
},
append: function( jqElements ) {
var $root = $( this.element ),
data = $root.data( "data" );
// add new elements
jqElements.each(
function( i, el ) {
data.paths.push( $(el) );
}
);
data.oldPage = data.pages[data.oldPageIndex].slice(0);
data.appended = true;
// rebuild pages
this._generatePages();
},
_autoMode: function( direction ) {
var options = this.options,
data = $( this.element ).data( "data" );
if ( direction === "next" ) {
data.interval = setTimeout( $.proxy(this.next, this), options.auto.interval );
} else {
data.interval = setTimeout( $.proxy(this.prev, this), options.auto.interval );
}
},
_checkOptionsValidity: function( options ) {
var i,
self = this,
_correctSteps = "";
// for every element in options object check its validity
$.each(options,
function( key, value ) {
switch ( key ) {
case "visible":
// visible should be a positive integer
if ( !value || typeof value !== "number" || value <= 0 || (Math.ceil(value) - value > 0) ) {
throw new Error( "visible should be defined as a positive integer" );
}
break;
case "step":
if ( !value || typeof value !== "number" || value <= 0 || (Math.ceil(value) - value > 0) ) {
throw new Error( "step should be defined as a positive integer" );
} else if ( value > self.options.visible ) {
// for example for visible: 3 the following array of values for 'step' is valid
// 3 <= step >= 1 by 1 ==> [1,2,3]
// output correct values
for ( i = 1; i <= Math.floor(options.visible); i++ ) {
_correctSteps += ( i < Math.floor(value) ) ? i + ", " : i;
}
throw new Error( "Only following step values are correct: " + _correctSteps );
}
break;
case "width":
// width & height is defined by default so you can omit them to some extent
if ( !value || typeof value !== "number" || value <= 0 || Math.ceil(value) - value > 0 ) {
throw new Error( "width should be defined as a positive integer" );
}
break;
case "height":
if ( !value || typeof value !== "number" || value <= 0 || Math.ceil(value) - value > 0 ) {
throw new Error("height should be defined as a positive integer");
}
break;
case "speed":
if ( !value && value !== 0 ) {
throw new Error("speed should be defined as a number or a string");
}
if ( typeof value === "number" && value < 0 ) {
throw new Error( "speed should be a positive number" );
} else if ( typeof value === "string" && !(value === "slow" || value === "normal" || value === "fast") ) {
throw new Error( 'Only "slow", "normal" and "fast" values are valid' );
}
break;
case "navigation":
if ( !value || $.isPlainObject(value) === false ) {
throw new Error( "navigation should be defined as an object with at least one of the properties: 'prev' or 'next' in it");
}
if ( value.prev && typeof value.prev !== "string" ) {
throw new Error( "navigation.prev should be defined as a string and point to '.class' or '#id' of an element" );
}
if ( value.next && typeof value.next !== "string" ) {
throw new Error(" navigation.next should be defined as a string and point to '.class' or '#id' of an element" );
}
break;
case "auto":
if ( typeof value.direction !== "string" ) {
throw new Error( "direction should be defined as a string" );
}
if ( !(value.direction === "next" || value.direction === "prev") ) {
throw new Error( "direction: only 'right' and 'left' values are valid" );
}
if ( isNaN(value.interval) || typeof value.interval !== "number" || value.interval < 0 || Math.ceil(value.interval) - value.interval > 0 ) {
throw new Error( "interval should be a positive number" );
}
break;
case "margin":
if ( isNaN(value) || typeof value !== "number" || value < 0 || Math.ceil(value) - value > 0 ) {
throw new Error( "margin should be a positive number" );
}
break;
}
}
);
},
_createDataObject: function() {
var $root = $( this.element );
$root.data("data",
{
paths: [],
pathsLen: 0,
pages: [],
lastPage: [],
oldPageIndex: 0,
pageIndex: 0,
navigation: {},
animated: false,
appended: false,
hoveredOver: false
}
);
},
_generatePages: function() {
var self = this,
options = this.options,
data = $( this.element ).data( "data" ),
_visible = options.visible,
_pathsLen = data.paths.length;
// having 10 elements: A, B, C, D, E, F, G, H, I, J the algorithm
// creates 3 pages for ‘visible: 5’ and ‘step: 4’:
// [ABCDE], [EFGHI], [FGHIJ]
function _init() {
// init creates the last page [FGHIJ] and remembers it
data.pages = [];
data.lastPage = [];
data.pages[0] = [];
// init last page
for ( var i = _pathsLen - 1; i >= _pathsLen - _visible; i-- ) {
data.lastPage.unshift( data.paths[i] );
}
// and first page
for ( var i = 0; i < _visible; i++ ) {
data.pages[0][data.pages[0].length] = data.paths[i];
}
}
function _islastPage( page ) {
var _isLast = false;
for ( var i = 0; i < data.lastPage.length; i++ ) {
if ( data.lastPage[i].get(0) === page[i].get(0) ) {
_isLast = true;
} else {
_isLast = false;
break;
}
}
return _isLast;
}
function _append( start, end, atIndex ) {
var _index = atIndex || data.pages.length;
if ( !atIndex ) {
data.pages[_index] = [];
}
for ( var i = start; i < end; i++ ) {
data.pages[_index].push( data.paths[i] );
}
return _index;
}
function _paginate() {
var _isBeginning = true,
_complement = false,
_start = options.step,
_end, _index, _oldFirstEl, _oldLastEl;
// continue until you reach the last page
// we start from the 2nd page (1st page has been already initiated)
while ( !_islastPage(data.pages[data.pages.length - 1]) || _isBeginning ) {
_isBeginning = false;
_end = _start + _visible;
// we cannot exceed _pathsLen
if ( _end > _pathsLen ) {
_end = _pathsLen;
}
// when we run ouf of elements (_end - _start < _visible) we must add the difference at the begining
// in our example the 3rd page is [FGHIJ] and J element is added in the second step
// first we add [FGHI] as old elements
// we must assure that we have always ‘visible’ (5 in our example) elements
if ( _end - _start < _visible ) {
_complement = true;
} else {
_complement = false;
}
if ( _complement ) {
// first add old elemets; for 3rd page it adds [FGHI…]
// remember the page we add to (_index)
_oldFirstEl = _start - ( _visible - (_end - _start) );
_oldLastEl = _oldFirstEl + ( _visible - (_end - _start) );
_index = _append( _oldFirstEl, _oldLastEl );
// then add new elements; for 3th page it is J element:
// [fghiJ]
_append( _start, _end, _index );
} else {
// normal pages like [ABCDE], [EFGHI]
_append( _start, _end );
// next step
_start += options.step;
}
}
}
// go!
_init();
_paginate();
},
getCurrentPage: function() {
var data = $( this.element ).data( "data" );
return data.pageIndex + 1;
},
getTotalPages: function() {
var data = $( this.element ).data( "data" );
return data.pages.length;
},
goToPage: function( page ) {
var _by,
data = $( this.element ).data( "data" );
if ( !data.animated && page !== data.pageIndex ) {
data.animated = true;
if ( page > data.pages.length - 1 ) {
page = data.pages.length - 1;
} else if ( page < 0 ) {
page = 0;
}
data.pageIndex = page;
_by = page - data.oldPageIndex;
if ( _by >= 0 ) {
//move by n elements from current index
this._goToNextPage( _by );
} else {
this._goToPrevPage( _by );
}
data.oldPageIndex = page;
}
},
_loadElements: function(elements, direction) {
var options = this.options,
data = $( this.element ).data( "data" ),
_dir = direction || "next",
_elem = elements || data.pages[options.startAtPage],
_start = 0,
_end = _elem.length;
if ( _dir === "next" ) {
for ( var i = _start; i < _end; i++ ) {
this._addElement( _elem[i], _dir );
}
} else {
for ( var i = _end - 1; i >= _start; i-- ) {
this._addElement( _elem[i], _dir );
}
}
},
_goToPrevPage: function( by ) {
var _page, _oldPage, _dist, _index, _animOpts, $lastEl, _unique, _pos, _theSame,
$root = $( this.element ),
self = this,
options = this.options,
data = $( this.element ).data( "data" );
// pick pages
if ( data.appended ) {
_oldPage = data.oldPage;
} else {
_oldPage = data.pages[data.oldPageIndex];
}
_index = data.oldPageIndex + by;
_page = data.pages[_index].slice( 0 );
// For example, the first time widget was initiated there were 5
// elements: A, B, C, D, E and 3 pages for visible 2 and step 2:
// AB, CD, DE. Then a user loaded next 5 elements so there were
// 10 already: A, B, C, D, E, F, G, H, I, J and 5 pages:
// AB, CD, EF, GH and IJ. If the other elemets were loaded when
// CD page was shown (from 5 elements) ‘_theSame’ is true because
// we compare the same
// pages, that is, the 2nd page from 5 elements and the 2nd from
// 10 elements. Thus what we do next is to decrement the index and
// loads the first page from 10 elements.
$( _page ).each(
function( i, el ) {
if ( el.get(0) === $(_oldPage[i]).get(0) ) {
_theSame = true;
} else {
_theSame = false;
}
}
);
if ( data.appended && _theSame ) {
if ( data.pageIndex === 0 ) {
_index = data.pageIndex = data.pages.length - 1;
} else {
_index = --data.pageIndex;
}
_page = data.pages[_index].slice( 0 );
}
// check if last element from _page appears in _oldPage
// for [ABCDFGHIJ] elements there are 3 pages for ‘visible’ = 6 and
// ‘step’ = 2: [ABCDEF], [CDEFGH] and [EFGHIJ]; going from the 3rd
// to the 2nd page we only loads 2 elements: [CD] because all
// remaining were loaded already
$lastEl = _page[_page.length - 1].get( 0 );
for ( var i = _oldPage.length - 1; i >= 0; i-- ) {
if ( $lastEl === $(_oldPage[i]).get(0) ) {
_unique = false;
_pos = i;
break;
} else {
_unique = true;
}
}
if ( !_unique ) {
while ( _pos >= 0 ) {
if ( _page[_page.length - 1].get(0) === _oldPage[_pos].get(0) ) {
// this element is unique
_page.pop();
}
--_pos;
}
}
// load new elements
self._loadElements( _page, "prev" );
// calculate the distance
_dist = options.width * _page.length + ( options.margin * _page.length );
if (options.orientation === "horizontal") {
_animOpts = {scrollLeft: 0};
$root.scrollLeft( _dist );
} else {
_animOpts = {scrollTop: 0};
$root.scrollTop( _dist );
}
$root
.animate(_animOpts, options.speed, function () {
self._removeOldElements( "last", _page.length );
data.animated = false;
if ( !data.hoveredOver && options.auto.enabled ) {
// if autoMode is on and you change page manually
clearInterval( data.interval );
self._autoMode( options.auto.direction );
}
// scrolling is finished, send an event
self._trigger("pageLoaded", null, {page: _index});
});
// reset to deafult
data.appended = false;
},
_goToNextPage: function( by ) {
var _page, _oldPage, _dist, _index, _animOpts, $firstEl, _unique, _pos, _theSame,
$root = $( this.element ),
options = this.options,
data = $root.data( "data" ),
self = this;
// pick pages
if ( data.appended ) {
_oldPage = data.oldPage;
} else {
_oldPage = data.pages[data.oldPageIndex];
}
_index = data.oldPageIndex + by;
_page = data.pages[_index].slice( 0 );
// For example, the first time widget was initiated there were 5
// elements: A, B, C, D, E and 2 pages for visible 4 and step 3:
// ABCD and BCDE. Then a user loaded next 5 elements so there were
// 10 already: A, B, C, D, E, F, G, H, I, J and 3 pages:
// ABCD, DEFG and GHIJ. If the other elemets were loaded when
// ABCD page was shown (from 5 elements) ‘_theSame’ is true because
// we compare the same
// pages, that is, the first pages from 5 elements and the first from
// 10 elements. Thus what we do next is to increment the index and
// loads the second page from 10 elements.
$( _page ).each(
function( i, el ) {
if ( el.get(0) === $(_oldPage[i]).get(0) ) {
_theSame = true;
} else {
_theSame = false;
}
}
);
if ( data.appended && _theSame ) {
_page = data.pages[++data.pageIndex].slice( 0 );
}
// check if 1st element from _page appears in _oldPage
// for [ABCDFGHIJ] elements there are 3 pages for ‘visible’ = 6 and
// ‘step’ = 2: [ABCDEF], [CDEFGH] and [EFGHIJ]; going from the 2nd
// to the 3rd page we only loads 2 elements: [IJ] because all
// remaining were loaded already
$firstEl = _page[0].get( 0 );
for ( var i = 0; i < _page.length; i++) {
if ( $firstEl === $(_oldPage[i]).get(0) ) {
_unique = false;
_pos = i;
break;
} else {
_unique = true;
}
}
if ( !_unique ) {
while ( _pos < _oldPage.length ) {
if ( _page[0].get(0) === _oldPage[_pos].get(0) ) {
_page.shift();
}
++_pos;
}
}
// load new elements
this._loadElements( _page, "next" );
// calculate the distance
_dist = options.width * _page.length + ( options.margin * _page.length );
if ( options.orientation === "horizontal" ) {
_animOpts = {scrollLeft: "+=" + _dist};
} else {
_animOpts = {scrollTop: "+=" + _dist};
}
$root
.animate(_animOpts, options.speed, function() {
self._removeOldElements( "first", _page.length );
if ( options.orientation === "horizontal" ) {
$root.scrollLeft( 0 );
} else {
$root.scrollTop( 0 );
}
data.animated = false;
if ( !data.hoveredOver && options.auto.enabled ) {
// if autoMode is on and you change page manually
clearInterval( data.interval );
self._autoMode( options.auto.direction );
}
// scrolling is finished, send an event
self._trigger( "pageLoaded", null, {page: _index});
});
// reset to deafult
data.appended = false;
},
next: function() {
var options = this.options,
data = $( this.element ).data( "data" );
if ( !data.animated ) {
data.animated = true;
if ( !data.appended ) {
++data.pageIndex;
}
if ( data.pageIndex > data.pages.length - 1 ) {
data.pageIndex = 0;
}
// move by one element from current index
this._goToNextPage( data.pageIndex - data.oldPageIndex );
data.oldPageIndex = data.pageIndex;
}
},
prev: function() {
var options = this.options,
data = $( this.element ).data( "data" );
if ( !data.animated ) {
data.animated = true;
if ( !data.appended ) {
--data.pageIndex;
}
if ( data.pageIndex < 0 ) {
data.pageIndex = data.pages.length - 1;
}
// move left by one element from current index
this._goToPrevPage( data.pageIndex - data.oldPageIndex );
data.oldPageIndex = data.pageIndex;
}
},
_removeOldElements: function(position, length) {
// remove 'step' elements
var $root = $( this.element );
for ( var i = 0; i < length; i++ ) {
if ( position === "first" ) {
$root
.find( "div.wrapper" )
.children()
.first()
.remove();
} else {
$root
.find( "div.wrapper" )
.children()
.last()
.remove();
}
}
},
_saveElements: function() {
var $el,
$root = $( this.element ),
$elements = $root.find( "div.wrapper" ).children(),
data = $root.data( "data" );
$elements.each(
function( i, el ) {
$el = $( el );
// keep element’s data and events
data.paths.push( $el.clone(true, true) );
$el.remove();
}
);
},
_setOption: function( key, value ) {
var _newOptions,
options = this.options,
data = $( this.element ).data( "data" );
switch (key) {
case "speed":
this._checkOptionsValidity({speed: value});
options.speed = value;
$.Widget.prototype._setOption.apply( this, arguments );
break;
case "auto":
_newOptions = $.extend( options.auto, value );
this._checkOptionsValidity({auto: _newOptions});
if ( options.auto.enabled ) {
this._autoMode( options.auto.direction );
}
}
},
_setStep: function(s) {
// calculate a step
var _step,
options = this.options,
data = $( this.element ).data( "data" );
_step = s || options.step;
options.step = _step;
data.step = options.width * _step;
},
_setCarouselHeight: function() {
var _newHeight,
$root = $( this.element ),
data = $( this.element ).data( "data" ),
options = this.options;
if ( options.orientation === "vertical" ) {
_newHeight = options.visible * options.height + options.margin * (options.visible - 1);
} else {
_newHeight = options.height;
}
$root.height(_newHeight);
},
_setCarouselWidth: function() {
var _newWidth,
$root = $( this.element ),
options = this.options,
data = $( this.element ).data( "data" );
if ( options.orientation === "horizontal" ) {
_newWidth = options.visible * options.width + options.margin * (options.visible - 1);
} else {
_newWidth = options.width;
}
// set carousel width and disable overflow: auto
$root.css({
width: _newWidth,
overflow: "hidden"
});
},
options: {
visible: 3,
step: 3,
width: 100,
height: 100,
speed: 1000,
margin: 0,
orientation: "horizontal",
auto: {
enabled: false,
direction: "next",
interval: 5000
},
startAtPage: 0,
navigation: {
next: "#ui-carousel-next",
prev: "#ui-carousel-prev"
}
}
});
}(jQuery));