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jquery.wookmark.js
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jquery.wookmark.js
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/*!
jQuery Wookmark plugin
@name jquery.wookmark.js
@author Christoph Ono (chri@sto.ph or @gbks)
@author Sebastian Helzle (sebastian@helzle.net or @sebobo)
@version 1.1.0
@date 1/27/2013
@category jQuery plugin
@copyright (c) 2009-2013 Christoph Ono (www.wookmark.com)
@license Licensed under the MIT (http://www.opensource.org/licenses/mit-license.php) license.
*/
(function($){
var Wookmark, defaultOptions, __bind;
__bind = function(fn, me) {
return function() {
return fn.apply(me, arguments);
};
};
// Wookmark default options
defaultOptions = {
align: 'center',
container: $('body'),
offset: 2,
autoResize: false,
itemWidth: 0,
flexibleWidth: 0,
resizeDelay: 50
};
Wookmark = (function(options) {
function Wookmark(handler, options) {
this.handler = handler;
// Layout variables.
this.columns = null;
this.containerWidth = null;
this.resizeTimer = null;
$.extend(true, this, defaultOptions, options);
// Bind methods
this.update = __bind(this.update, this);
this.onResize = __bind(this.onResize, this);
this.getItemWidth = __bind(this.getItemWidth, this);
this.layout = __bind(this.layout, this);
this.layoutFull = __bind(this.layoutFull, this);
this.layoutColumns = __bind(this.layoutColumns, this);
this.clear = __bind(this.clear, this);
// Listen to resize event if requested.
if (this.autoResize) {
$(window).bind('resize.wookmark', this.onResize);
this.container.bind('refreshWookmark', this.onResize);
};
};
// Method for updating the plugins options
Wookmark.prototype.update = function(options) {
$.extend(true, this, options);
};
// This timer ensures that layout is not continuously called as window is being dragged.
Wookmark.prototype.onResize = function() {
clearTimeout(this.resizeTimer);
this.resizeTimer = setTimeout(this.layout, this.resizeDelay);
};
// Method to get the standard item width
Wookmark.prototype.getItemWidth = function() {
return this.itemWidth === undefined || this.itemWidth === 0 ? this.handler.eq(0).outerWidth() : this.itemWidth;
};
// Method to get the flexible item width
Wookmark.prototype.getFlexibleWidth = function() {
var containerWidth = this.container.width(), columns = 1, columnWidth = containerWidth;
for (; columnWidth > this.flexibleWidth; columns++) {
columnWidth = (containerWidth - (columns - 1) * this.offset)/(columns);
}
return Math.floor(columnWidth);
};
// Main layout methdd.
Wookmark.prototype.layout = function() {
// Do nothing if container isn't visible
if(!this.container.is(":visible")) {
return;
}
// Calculate flexible item width if option is set
if (this.flexibleWidth) {
this.itemWidth = this.getFlexibleWidth();
// Stretch items to fill calculated width
this.handler.css('width', this.itemWidth + 'px');
}
// Calculate basic layout parameters.
var columnWidth = this.getItemWidth() + this.offset,
containerWidth = this.container.width(),
columns = Math.floor((containerWidth + this.offset) / columnWidth),
offset = 0,
bottom = 0;
// Calculate the offset based on the alignment of columns to the parent container
switch (this.align) {
case 'left':
case 'right':
offset = Math.floor((columns / columnWidth + this.offset) / 2);
break;
case 'center':
default:
offset = Math.round((containerWidth - (columns * columnWidth - this.offset)) / 2);
break;
}
// If container and column count hasn't changed, we can only update the columns.
if(this.columns != null && this.columns.length == columns) {
bottom = this.layoutColumns(columnWidth, offset);
} else {
bottom = this.layoutFull(columnWidth, columns, offset);
}
// Set container height to height of the grid.
this.container.css('height', bottom + 'px');
};
/**
* Perform a full layout update.
*/
Wookmark.prototype.layoutFull = function(columnWidth, columns, offset) {
// Prepare Array to store height of columns.
var heights = [];
while (heights.length < columns) {
heights.push(0);
}
// Store column data.
this.columns = [];
while (this.columns.length < columns) {
this.columns.push([]);
}
// Loop over items.
var item, top, left, i = 0, k = 0,
length = this.handler.length,
shortest = null,
shortestIndex = null,
bottom = 0,
itemCSS = {position: 'absolute'},
sideOffset;
for(; i < length; i++ ) {
item = this.handler.eq(i);
// Find the shortest column.
shortest = heights[0];
shortestIndex = 0;
for (k = 0; k < columns; k++) {
if (heights[k] < shortest) {
shortest = heights[k];
shortestIndex = k;
}
}
// Postion the item.
itemCSS.top = shortest + 'px';
sideOffset = (shortestIndex * columnWidth + offset) + 'px';
if (this.align == 'right') {
itemCSS.right = sideOffset;
} else {
itemCSS.left = sideOffset;
}
item.css(itemCSS);
// Update column height.
heights[shortestIndex] = shortest + item.outerHeight() + this.offset;
bottom = Math.max(bottom, heights[shortestIndex]);
this.columns[shortestIndex].push(item);
}
return bottom;
};
/**
* This layout method only updates the vertical position of the
* existing column assignments.
*/
Wookmark.prototype.layoutColumns = function(columnWidth, offset) {
var heights = [],
length = this.columns.length,
i = 0, column, k = 0, kLength, item,
bottom = 0, itemCSS, sideOffset;
while (heights.length < length) {
heights.push(0);
}
for (; i < length; i++) {
column = this.columns[i];
kLength = column.length;
for (k = 0; k < kLength; k++) {
item = column[k];
itemCSS = {
top: heights[i] + 'px'
};
sideOffset = (i * columnWidth + offset) + 'px';
if (this.align == 'right') {
itemCSS.right = sideOffset;
} else {
itemCSS.left = sideOffset;
}
item.css(itemCSS);
heights[i] += item.outerHeight() + this.offset;
bottom = Math.max(bottom, heights[i]);
}
}
return bottom;
};
/**
* Clear event listeners and time outs.
*/
Wookmark.prototype.clear = function() {
clearTimeout(this.resizeTimer);
$(window).unbind('resize.wookmark', this.onResize);
this.container.unbind('refreshWookmark', this.onResize);
};
return Wookmark;
})();
$.fn.wookmark = function(options) {
// Create a wookmark instance if not available
if (!this.wookmarkInstance) {
this.wookmarkInstance = new Wookmark(this, options || {});
} else {
this.wookmarkInstance.update(options || {});
}
// Apply layout
this.wookmarkInstance.layout();
// Display items (if hidden) and return jQuery object to maintain chainability
return this.show();
};
})(jQuery);