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jquery.flowgallery.js
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jquery.flowgallery.js
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/*!
* jQuery flowGallery plugin: Cover Flow Image Gallery
* Examples and documentation at: http://github.com/bozz/flowGallery
* version 0.6.4 (03-JUL-2011)
* Author: Boris Searles (boris@lucidgardens.com)
* Requires jQuery v1.3.2 or later
* Dual licensed under the MIT and GPL licenses:
* http://www.opensource.org/licenses/mit-license.php
* http://www.gnu.org/licenses/gpl.html
*/
(function($) {
/* plugin point of entry */
$.fn.flowGallery = function(options) {
_options = $.extend($.fn.flowGallery.defaults, options);
return this.each(function(index){
_initList(this);
});
};
// expose options
$.fn.flowGallery.defaults = {
activeIndex: 0, // index of image that is initially active
animate: true,
enableKeyNavigation: true, // enables forward/backward arrow keys for next/previous navigation
forwardOnActiveClick: false, // should clicking on active image, show next image?
forceWidth: false,
forceHeight: false,
backgroundColor: 'black',
thumbWidth: 'auto',
thumbHeight: 'auto',
thumbTopOffset: 'auto', // top offset in pixels or 'auto' for centering images within list height
imagePadding: 4, // border of active image
thumbPadding: 3, // border of thumbnails
loadingClass: "loading", // css class applied to <li> elements of loading images
easing: 'linear',
duration: 900 // animation duration (higher value = slower speed)
};
// applied options (overridden defaults)
var _options = {};
// initialize:
var _initList = function(elem) {
_elCounter = 0;
_activeIndex = 0; // index of initial active element
_activeElem = false; // reference to active <li> dom element
_activeLoaded = false; // has active image been loaded?
_listElem = false; // reference to <ul> list dom element
_listWidth = 0; // list width (default: screen width)
_listHeight = 0; // list height (height of highest image)
_centerX = 0; // horizontal center within list
_centerY = 0;
_container = null; // parent element
// stores initial image data (height, width, thumbHeight, thumbWidth)
// format: [{
// h: 400, // full size image height
// w: 200, // full size image width
// th: 100, // thumb height
// tw: 50 // thumb width
// }]
_imgData = [];
_listElem = elem;
_container = $(_listElem).css({
listStyle: 'none',
overflow: 'hidden',
marginLeft: '0',
paddingLeft: '0',
position: 'relative',
width: '100%'
}).parent();
var wrapperElem = document.createElement('div');
var captionElem = document.createElement('p');
$(captionElem).addClass('bf-caption').css({
backgroundColor: _options.backgroundColor,
display: 'none',
marginTop: '0',
padding: '8px ' + (_options.imagePadding+10) + 'px 15px',
position: 'absolute'
});
$(wrapperElem).addClass('bf-wrapper').css({
position: 'relative'
}).append(_listElem).append(captionElem);
_container.append(wrapperElem);
$(window).resize(function(){
_listWidth = _container.width();
_centerX = _listWidth*0.5;
_updateFlow();
_showCaption(_activeElem);
});
var listItems = $(_listElem).children();
var activeImageHeight = false;
// loop through list items to extract image data and determine list height
listItems.each(function(index) {
var img = $(this).find('img');
if(_options.forceWidth) {
img.width(_options.forceWidth);
}
var isLoaded = _isImageSizeLoaded(img.get(0));
var dimensions = _getImageDimensions(img, isLoaded);
_imgData.push(dimensions);
_addLoadHandler(img, index);
if(index===_activeIndex && isLoaded) {
activeImageHeight = dimensions.h;
}
_initListItem(this, index);
});
_listWidth = _container.width();
_centerX = _listWidth*0.5;
if(activeImageHeight) {
_centerY = _options.thumbTopOffset==='auto' ? activeImageHeight*0.5 : _options.thumbTopOffset;
} else {
_centerY = _options.thumbTopOffset==='auto' ? _listHeight*0.5 : _options.thumbTopOffset+_options.thumbHeight*0.5;
}
if(_options.enableKeyNavigation===true) {
$(document).unbind('keydown', _handleKeyEvents).keydown(_handleKeyEvents);
}
_updateFlow();
};
var _handleKeyEvents = function(e) {
if(e.keyCode===37) { // right arrow key
_flowInDir(-1);
} else if(e.keyCode===39) { // left arrow key
_flowInDir(1);
}
};
var _initListItem = function(elem, index) {
$(elem).css({
backgroundColor: _options.backgroundColor,
position: 'absolute',
textAlign: 'center'
}).find('img').css({
cursor: 'pointer',
height: '100%',
imageRendering: 'optimizeQuality', // firefox property
//-ms-interpolation-mode: 'bicubic', // IE property
width: '100%'
});
if(!_activeElem && _options.activeIndex===index) {
$(elem).addClass('active');
_activeElem = elem;
_activeIndex = index;
}
_elCounter++;
};
var _updateFlow = function(animate) {
var isBefore = true;
var leftOffset, topOffset, elWidth, elHeight, padding = 0;
var completeFn = null;
var afterFlowFn = function(){
_showCaption(_activeElem);
// adjust if width changed (i.e. if scrollbars get displayed)
if(_container.width() !== _listWidth) {
_listWidth = _container.width();
_centerX = _listWidth*0.5;
_updateFlow();
_showCaption(_activeElem);
}
};
var config = {};
$(_listElem).children().each(function(i){
if($(this).hasClass('active')) {
config = {
left: (_centerX - _options.imagePadding - _imgData[i].w * 0.5) + 'px',
top: '0',
width: _imgData[i].w+'px',
height: _imgData[i].h+'px',
padding: _options.imagePadding+'px'
};
isBefore = false;
completeFn = afterFlowFn;
} else {
config = {
left: _calculateLeftPosition(i, isBefore),
top: (_centerY - _imgData[i].th*0.5) + 'px',
width: _imgData[i].tw+'px',
height: _imgData[i].th+'px',
padding: _options.thumbPadding+'px'
};
completeFn = null;
}
// TODO: only animate visible images...
if(animate) {
$(this).stop().animate(config, { duration: _options.duration, easing: _options.easing, complete: completeFn });
} else {
$(this).css(config);
if(completeFn) { completeFn(); }
}
});
};
var _calculateLeftPosition = function(current, isBefore) {
var left = _centerX;
if (isBefore) {
left -= _imgData[_activeIndex].w*0.5;
left -= _options.imagePadding;
left -= (_activeIndex - current) * 10;
left -= (_activeIndex - current) * 2 * _options.thumbPadding;
for (i = current; i < _activeIndex; i++) {
left -= _imgData[i].tw;
}
return left + 'px';
} else {
left += _imgData[_activeIndex].w*0.5;
left += _options.imagePadding;
left += (current - _activeIndex) * 10;
left += (current - _activeIndex) * 2 * _options.thumbPadding;
for (i = _activeIndex + 1; i < current; i++) {
left += _imgData[i].tw;
}
return left + 'px';
}
};
var _showCaption = function(elem) {
var img = $(elem).find('img').get(0);
if(!_isImageSizeLoaded(img)) { return false; }
var caption = $(elem).parent().parent().find('p.bf-caption');
var captionText = img.title;
if(img.title.length > 0){
caption.text(captionText);
caption.css({
left: _centerX - _options.imagePadding - _imgData[_activeIndex].w * 0.5,
top: _imgData[_activeIndex].h + _options.imagePadding*2,
width: _imgData[_activeIndex].w - 20
});
// set height of caption as bottom margin for list
var fullHeight = $(_listElem).height() + caption.height() + 40;
$(_listElem).parent().height(fullHeight);
caption.fadeIn('fast');
}
};
// returns image dimensions (isLoaded default: false)
var _getImageDimensions = function(img, isLoaded) {
isLoaded = isLoaded || false;
var imgWidth, imgHeight, thumbWidth, thumbHeight = 0;
if(isLoaded) {
var img_raw = img.get(0);
if(typeof img_raw.naturalWidth !== 'undefined') {
imgWidth = _options.forceWidth || img_raw.naturalWidth || img_raw.width;
imgHeight = _options.forceHeight || img_raw.naturalHeight || img_raw.height;
} else {
var tmpImg = new Image();
tmpImg.src = img.attr('src');
imgWidth = tmpImg.width;
imgHeight = tmpImg.height;
}
} else {
imgWidth = img.attr('width');
imgHeight = img.attr('height');
}
if(_options.thumbWidth === 'auto' && _options.thumbHeight == 'auto') {
thumbWidth = 100;
thumbHeight = Math.round(imgHeight * 100 / imgWidth);
} else if (_options.thumbHeight === 'auto') {
thumbWidth = _options.thumbWidth;
thumbHeight = Math.round(imgHeight * Number(_options.thumbWidth) / imgWidth);
} else if (_options.thumbWidth === 'auto') {
thumbWidth = Math.round(imgWidth * Number(_options.thumbHeight) / imgHeight);
thumbHeight = _options.thumbHeight;
} else {
thumbWidth = _options.thumbWidth;
thumbHeight = _options.thumbHeight;
}
_updateListHeight(imgHeight);
return {h:imgHeight, w:imgWidth, th:thumbHeight, tw:thumbWidth};
};
// checks if image has been fully loaded
var _isImageSizeLoaded = function(img) {
if((_options.forceWidth && _options.forceHeight) ||
(img.width > _options.thumbWidth && img.height > 20)) {
return true;
}
if(!img.complete) {
return false;
}
if(typeof img.naturalWidth !== "undefined" && img.naturalWidth===0) {
return false;
}
return true;
};
// handle loading of incomplete images
var _addLoadHandler = function(img, index) {
img.hide().parent().addClass(_options.loadingClass).css({
height: _imgData[index].th,
width: _imgData[index].tw
});
var loadCompleteFn = function(e){
if (this.complete || (this.readyState === 'complete' && e.type ==='readystatechange')) {
$(this).css('visibility', 'visible').parent().removeClass(_options.loadingClass);
$(this).fadeIn();
var dimensions = _getImageDimensions(img, true);
_imgData[index] = dimensions;
if(index===_options.activeIndex) {
_activeLoaded = true;
_centerY = _options.thumbTopOffset==='auto' ? dimensions.h*0.5 : _options.thumbTopOffset;
if(e) { _updateFlow(); }
} else {
var animateParams = { height: dimensions.th };
if(_activeLoaded) {
animateParams.top = (_centerY - _imgData[index].th*0.5) + 'px';
}
img.parent().animate(animateParams);
}
_addClickHandler(img.parent());
}
};
var raw_img = img.get(0);
if(raw_img.complete) {
loadCompleteFn.call(raw_img);
} else {
img.bind('load readystatechange', loadCompleteFn)
.bind('error', function () {
$(this).css('visibility', 'visible').parent().removeClass(_options.loadingClass);
});
}
};
// add click handler to listElement <li> containing image
var _addClickHandler = function(elem) {
$(elem).click(function(){
if(this !== _activeElem) {
$("p.bf-caption").hide();
_activeIndex = 0;
_activeElem = this;
$(this).parent().children().each(function(i){
if(_activeElem===this) {
_activeIndex = i;
}
});
_prepareFlow();
_updateFlow(_options.animate);
} else {
if(_options.forwardOnActiveClick===true) {
_flowInDir(1);
}
}
});
};
// trigger flow in direction from current active element;
// positive value flows to the right, negative values to the left;
var _flowInDir = function(dir) {
if(dir<0 && _activeIndex > 0) {
_activeIndex += dir;
} else if(dir>0 && _activeIndex < _imgData.length-1) {
_activeIndex += dir;
} else {
return false;
}
_activeElem = $(_listElem).children().get(_activeIndex);
_prepareFlow();
_updateFlow(_options.animate);
};
var _prepareFlow = function(activeElem) {
$("p.bf-caption").hide();
$(_listElem).find('.active').removeClass('active');
$(_activeElem).addClass('active');
// update width (changes if scrollbars disappear)
_listWidth = _container.width();
_centerX = _listWidth*0.5;
};
// set list height to height of tallest image (needed for overflow:hidden)
var _updateListHeight = function(height) {
if(height > _listHeight) {
_listHeight = height;
_listHeight += _options.imagePadding*2;
$(_listElem).height(_listHeight);
}
};
})(jQuery);