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/*!
* Masonry v4.0.0
* Cascading grid layout library
* http://masonry.desandro.com
* MIT License
* by David DeSandro
*/
( function( window, factory ) {
// universal module definition
/* jshint strict: false */ /*globals define, module, require */
if ( typeof define == 'function' && define.amd ) {
// AMD
define( [
'outlayer/outlayer',
'get-size/get-size'
],
factory );
} else if ( typeof module == 'object' && module.exports ) {
// CommonJS
module.exports = factory(
require('outlayer'),
require('get-size')
);
} else {
// browser global
window.Masonry = factory(
window.Outlayer,
window.getSize
);
}
}( window, function factory( Outlayer, getSize ) {
'use strict';
// -------------------------- masonryDefinition -------------------------- //
// create an Outlayer layout class
var Masonry = Outlayer.create('masonry');
// isFitWidth -> fitWidth
Masonry.compatOptions.fitWidth = 'isFitWidth';
Masonry.prototype._resetLayout = function() {
this.getSize();
this._getMeasurement( 'columnWidth', 'outerWidth' );
this._getMeasurement( 'gutter', 'outerWidth' );
this.measureColumns();
// reset column Y
this.colYs = [];
for ( var i=0; i < this.cols; i++ ) {
this.colYs.push( 0 );
}
this.maxY = 0;
};
Masonry.prototype.measureColumns = function() {
this.getContainerWidth();
// if columnWidth is 0, default to outerWidth of first item
if ( !this.columnWidth ) {
var firstItem = this.items[0];
var firstItemElem = firstItem && firstItem.element;
// columnWidth fall back to item of first element
this.columnWidth = firstItemElem && getSize( firstItemElem ).outerWidth ||
// if first elem has no width, default to size of container
this.containerWidth;
}
var columnWidth = this.columnWidth += this.gutter;
// calculate columns
var containerWidth = this.containerWidth + this.gutter;
var cols = containerWidth / columnWidth;
// fix rounding errors, typically with gutters
var excess = columnWidth - containerWidth % columnWidth;
// if overshoot is less than a pixel, round up, otherwise floor it
var mathMethod = excess && excess < 1 ? 'round' : 'floor';
cols = Math[ mathMethod ]( cols );
this.cols = Math.max( cols, 1 );
};
Masonry.prototype.getContainerWidth = function() {
// container is parent if fit width
var isFitWidth = this._getOption('fitWidth');
var container = isFitWidth ? this.element.parentNode : this.element;
// check that this.size and size are there
// IE8 triggers resize on body size change, so they might not be
var size = getSize( container );
this.containerWidth = size && size.innerWidth;
};
Masonry.prototype._getItemLayoutPosition = function( item ) {
item.getSize();
// how many columns does this brick span
var remainder = item.size.outerWidth % this.columnWidth;
var mathMethod = remainder && remainder < 1 ? 'round' : 'ceil';
// round if off by 1 pixel, otherwise use ceil
var colSpan = Math[ mathMethod ]( item.size.outerWidth / this.columnWidth );
colSpan = Math.min( colSpan, this.cols );
var colGroup = this._getColGroup( colSpan );
// get the minimum Y value from the columns
var minimumY = Math.min.apply( Math, colGroup );
var shortColIndex = colGroup.indexOf( minimumY );
// position the brick
var position = {
x: this.columnWidth * shortColIndex,
y: minimumY
};
// apply setHeight to necessary columns
var setHeight = minimumY + item.size.outerHeight;
var setSpan = this.cols + 1 - colGroup.length;
for ( var i = 0; i < setSpan; i++ ) {
this.colYs[ shortColIndex + i ] = setHeight;
}
return position;
};
/**
* @param {Number} colSpan - number of columns the element spans
* @returns {Array} colGroup
*/
Masonry.prototype._getColGroup = function( colSpan ) {
if ( colSpan < 2 ) {
// if brick spans only one column, use all the column Ys
return this.colYs;
}
var colGroup = [];
// how many different places could this brick fit horizontally
var groupCount = this.cols + 1 - colSpan;
// for each group potential horizontal position
for ( var i = 0; i < groupCount; i++ ) {
// make an array of colY values for that one group
var groupColYs = this.colYs.slice( i, i + colSpan );
// and get the max value of the array
colGroup[i] = Math.max.apply( Math, groupColYs );
}
return colGroup;
};
Masonry.prototype._manageStamp = function( stamp ) {
var stampSize = getSize( stamp );
var offset = this._getElementOffset( stamp );
// get the columns that this stamp affects
var isOriginLeft = this._getOption('originLeft');
var firstX = isOriginLeft ? offset.left : offset.right;
var lastX = firstX + stampSize.outerWidth;
var firstCol = Math.floor( firstX / this.columnWidth );
firstCol = Math.max( 0, firstCol );
var lastCol = Math.floor( lastX / this.columnWidth );
// lastCol should not go over if multiple of columnWidth #425
lastCol -= lastX % this.columnWidth ? 0 : 1;
lastCol = Math.min( this.cols - 1, lastCol );
// set colYs to bottom of the stamp
var isOriginTop = this._getOption('originTop');
var stampMaxY = ( isOriginTop ? offset.top : offset.bottom ) +
stampSize.outerHeight;
for ( var i = firstCol; i <= lastCol; i++ ) {
this.colYs[i] = Math.max( stampMaxY, this.colYs[i] );
}
};
Masonry.prototype._getContainerSize = function() {
this.maxY = Math.max.apply( Math, this.colYs );
var size = {
height: this.maxY
};
if ( this._getOption('fitWidth') ) {
size.width = this._getContainerFitWidth();
}
return size;
};
Masonry.prototype._getContainerFitWidth = function() {
var unusedCols = 0;
// count unused columns
var i = this.cols;
while ( --i ) {
if ( this.colYs[i] !== 0 ) {
break;
}
unusedCols++;
}
// fit container to columns that have been used
return ( this.cols - unusedCols ) * this.columnWidth - this.gutter;
};
Masonry.prototype.needsResizeLayout = function() {
var previousWidth = this.containerWidth;
this.getContainerWidth();
return previousWidth != this.containerWidth;
};
return Masonry;
}));
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