554 lines
14 KiB
JavaScript
554 lines
14 KiB
JavaScript
/**
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* Outlayer Item
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*/
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( function( window, factory ) {
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// universal module definition
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/* jshint strict: false */ /* globals define, module, require */
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if ( typeof define == 'function' && define.amd ) {
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// AMD - RequireJS
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define( [
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'ev-emitter/ev-emitter',
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'get-size/get-size'
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],
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factory
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);
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} else if ( typeof module == 'object' && module.exports ) {
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// CommonJS - Browserify, Webpack
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module.exports = factory(
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require('ev-emitter'),
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require('get-size')
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);
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} else {
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// browser global
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window.Outlayer = {};
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window.Outlayer.Item = factory(
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window.EvEmitter,
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window.getSize
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);
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}
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}( window, function factory( EvEmitter, getSize ) {
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'use strict';
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// ----- helpers ----- //
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function isEmptyObj( obj ) {
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for ( var prop in obj ) {
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return false;
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}
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prop = null;
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return true;
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}
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// -------------------------- CSS3 support -------------------------- //
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var docElemStyle = document.documentElement.style;
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var transitionProperty = typeof docElemStyle.transition == 'string' ?
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'transition' : 'WebkitTransition';
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var transformProperty = typeof docElemStyle.transform == 'string' ?
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'transform' : 'WebkitTransform';
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var transitionEndEvent = {
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WebkitTransition: 'webkitTransitionEnd',
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transition: 'transitionend'
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}[ transitionProperty ];
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// cache all vendor properties that could have vendor prefix
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var vendorProperties = {
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transform: transformProperty,
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transition: transitionProperty,
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transitionDuration: transitionProperty + 'Duration',
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transitionProperty: transitionProperty + 'Property',
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transitionDelay: transitionProperty + 'Delay'
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};
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// -------------------------- Item -------------------------- //
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function Item( element, layout ) {
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if ( !element ) {
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return;
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}
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this.element = element;
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// parent layout class, i.e. Masonry, Isotope, or Packery
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this.layout = layout;
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this.position = {
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x: 0,
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y: 0
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};
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this._create();
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}
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// inherit EvEmitter
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var proto = Item.prototype = Object.create( EvEmitter.prototype );
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proto.constructor = Item;
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proto._create = function() {
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// transition objects
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this._transn = {
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ingProperties: {},
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clean: {},
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onEnd: {}
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};
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this.css({
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position: 'absolute'
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});
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};
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// trigger specified handler for event type
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proto.handleEvent = function( event ) {
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var method = 'on' + event.type;
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if ( this[ method ] ) {
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this[ method ]( event );
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}
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};
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proto.getSize = function() {
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this.size = getSize( this.element );
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};
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/**
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* apply CSS styles to element
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* @param {Object} style
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*/
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proto.css = function( style ) {
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var elemStyle = this.element.style;
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for ( var prop in style ) {
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// use vendor property if available
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var supportedProp = vendorProperties[ prop ] || prop;
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elemStyle[ supportedProp ] = style[ prop ];
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}
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};
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// measure position, and sets it
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proto.getPosition = function() {
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var style = getComputedStyle( this.element );
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var isOriginLeft = this.layout._getOption('originLeft');
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var isOriginTop = this.layout._getOption('originTop');
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var xValue = style[ isOriginLeft ? 'left' : 'right' ];
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var yValue = style[ isOriginTop ? 'top' : 'bottom' ];
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// convert percent to pixels
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var layoutSize = this.layout.size;
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var x = xValue.indexOf('%') != -1 ?
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( parseFloat( xValue ) / 100 ) * layoutSize.width : parseInt( xValue, 10 );
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var y = yValue.indexOf('%') != -1 ?
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( parseFloat( yValue ) / 100 ) * layoutSize.height : parseInt( yValue, 10 );
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// clean up 'auto' or other non-integer values
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x = isNaN( x ) ? 0 : x;
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y = isNaN( y ) ? 0 : y;
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// remove padding from measurement
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x -= isOriginLeft ? layoutSize.paddingLeft : layoutSize.paddingRight;
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y -= isOriginTop ? layoutSize.paddingTop : layoutSize.paddingBottom;
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this.position.x = x;
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this.position.y = y;
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};
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// set settled position, apply padding
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proto.layoutPosition = function() {
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var layoutSize = this.layout.size;
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var style = {};
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var isOriginLeft = this.layout._getOption('originLeft');
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var isOriginTop = this.layout._getOption('originTop');
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// x
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var xPadding = isOriginLeft ? 'paddingLeft' : 'paddingRight';
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var xProperty = isOriginLeft ? 'left' : 'right';
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var xResetProperty = isOriginLeft ? 'right' : 'left';
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var x = this.position.x + layoutSize[ xPadding ];
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// set in percentage or pixels
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style[ xProperty ] = this.getXValue( x );
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// reset other property
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style[ xResetProperty ] = '';
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// y
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var yPadding = isOriginTop ? 'paddingTop' : 'paddingBottom';
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var yProperty = isOriginTop ? 'top' : 'bottom';
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var yResetProperty = isOriginTop ? 'bottom' : 'top';
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var y = this.position.y + layoutSize[ yPadding ];
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// set in percentage or pixels
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style[ yProperty ] = this.getYValue( y );
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// reset other property
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style[ yResetProperty ] = '';
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this.css( style );
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this.emitEvent( 'layout', [ this ] );
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};
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proto.getXValue = function( x ) {
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var isHorizontal = this.layout._getOption('horizontal');
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return this.layout.options.percentPosition && !isHorizontal ?
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( ( x / this.layout.size.width ) * 100 ) + '%' : x + 'px';
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};
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proto.getYValue = function( y ) {
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var isHorizontal = this.layout._getOption('horizontal');
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return this.layout.options.percentPosition && isHorizontal ?
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( ( y / this.layout.size.height ) * 100 ) + '%' : y + 'px';
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};
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proto._transitionTo = function( x, y ) {
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this.getPosition();
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// get current x & y from top/left
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var curX = this.position.x;
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var curY = this.position.y;
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var compareX = parseInt( x, 10 );
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var compareY = parseInt( y, 10 );
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var didNotMove = compareX === this.position.x && compareY === this.position.y;
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// save end position
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this.setPosition( x, y );
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// if did not move and not transitioning, just go to layout
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if ( didNotMove && !this.isTransitioning ) {
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this.layoutPosition();
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return;
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}
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var transX = x - curX;
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var transY = y - curY;
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var transitionStyle = {};
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transitionStyle.transform = this.getTranslate( transX, transY );
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this.transition({
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to: transitionStyle,
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onTransitionEnd: {
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transform: this.layoutPosition
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},
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isCleaning: true
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});
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};
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proto.getTranslate = function( x, y ) {
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// flip cooridinates if origin on right or bottom
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var isOriginLeft = this.layout._getOption('originLeft');
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var isOriginTop = this.layout._getOption('originTop');
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x = isOriginLeft ? x : -x;
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y = isOriginTop ? y : -y;
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return 'translate3d(' + x + 'px, ' + y + 'px, 0)';
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};
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// non transition + transform support
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proto.goTo = function( x, y ) {
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this.setPosition( x, y );
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this.layoutPosition();
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};
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proto.moveTo = proto._transitionTo;
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proto.setPosition = function( x, y ) {
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this.position.x = parseInt( x, 10 );
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this.position.y = parseInt( y, 10 );
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};
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// ----- transition ----- //
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/**
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* @param {Object} style - CSS
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* @param {Function} onTransitionEnd
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*/
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// non transition, just trigger callback
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proto._nonTransition = function( args ) {
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this.css( args.to );
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if ( args.isCleaning ) {
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this._removeStyles( args.to );
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}
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for ( var prop in args.onTransitionEnd ) {
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args.onTransitionEnd[ prop ].call( this );
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}
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};
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/**
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* proper transition
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* @param {Object} args - arguments
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* @param {Object} to - style to transition to
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* @param {Object} from - style to start transition from
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* @param {Boolean} isCleaning - removes transition styles after transition
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* @param {Function} onTransitionEnd - callback
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*/
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proto.transition = function( args ) {
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// redirect to nonTransition if no transition duration
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if ( !parseFloat( this.layout.options.transitionDuration ) ) {
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this._nonTransition( args );
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return;
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}
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var _transition = this._transn;
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// keep track of onTransitionEnd callback by css property
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for ( var prop in args.onTransitionEnd ) {
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_transition.onEnd[ prop ] = args.onTransitionEnd[ prop ];
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}
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// keep track of properties that are transitioning
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for ( prop in args.to ) {
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_transition.ingProperties[ prop ] = true;
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// keep track of properties to clean up when transition is done
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if ( args.isCleaning ) {
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_transition.clean[ prop ] = true;
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}
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}
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// set from styles
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if ( args.from ) {
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this.css( args.from );
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// force redraw. http://blog.alexmaccaw.com/css-transitions
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var h = this.element.offsetHeight;
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// hack for JSHint to hush about unused var
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h = null;
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}
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// enable transition
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this.enableTransition( args.to );
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// set styles that are transitioning
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this.css( args.to );
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this.isTransitioning = true;
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};
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// dash before all cap letters, including first for
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// WebkitTransform => -webkit-transform
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function toDashedAll( str ) {
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return str.replace( /([A-Z])/g, function( $1 ) {
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return '-' + $1.toLowerCase();
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});
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}
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var transitionProps = 'opacity,' + toDashedAll( transformProperty );
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proto.enableTransition = function(/* style */) {
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// HACK changing transitionProperty during a transition
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// will cause transition to jump
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if ( this.isTransitioning ) {
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return;
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}
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// make `transition: foo, bar, baz` from style object
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// HACK un-comment this when enableTransition can work
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// while a transition is happening
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// var transitionValues = [];
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// for ( var prop in style ) {
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// // dash-ify camelCased properties like WebkitTransition
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// prop = vendorProperties[ prop ] || prop;
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// transitionValues.push( toDashedAll( prop ) );
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// }
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// munge number to millisecond, to match stagger
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var duration = this.layout.options.transitionDuration;
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duration = typeof duration == 'number' ? duration + 'ms' : duration;
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// enable transition styles
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this.css({
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transitionProperty: transitionProps,
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transitionDuration: duration,
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transitionDelay: this.staggerDelay || 0
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});
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// listen for transition end event
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this.element.addEventListener( transitionEndEvent, this, false );
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};
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// ----- events ----- //
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proto.onwebkitTransitionEnd = function( event ) {
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this.ontransitionend( event );
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};
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proto.onotransitionend = function( event ) {
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this.ontransitionend( event );
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};
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// properties that I munge to make my life easier
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var dashedVendorProperties = {
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'-webkit-transform': 'transform'
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};
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proto.ontransitionend = function( event ) {
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// disregard bubbled events from children
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if ( event.target !== this.element ) {
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return;
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}
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var _transition = this._transn;
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// get property name of transitioned property, convert to prefix-free
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var propertyName = dashedVendorProperties[ event.propertyName ] || event.propertyName;
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// remove property that has completed transitioning
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delete _transition.ingProperties[ propertyName ];
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// check if any properties are still transitioning
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if ( isEmptyObj( _transition.ingProperties ) ) {
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// all properties have completed transitioning
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this.disableTransition();
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}
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// clean style
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if ( propertyName in _transition.clean ) {
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// clean up style
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this.element.style[ event.propertyName ] = '';
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delete _transition.clean[ propertyName ];
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}
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// trigger onTransitionEnd callback
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if ( propertyName in _transition.onEnd ) {
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var onTransitionEnd = _transition.onEnd[ propertyName ];
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onTransitionEnd.call( this );
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delete _transition.onEnd[ propertyName ];
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}
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this.emitEvent( 'transitionEnd', [ this ] );
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};
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proto.disableTransition = function() {
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this.removeTransitionStyles();
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this.element.removeEventListener( transitionEndEvent, this, false );
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this.isTransitioning = false;
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};
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/**
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* removes style property from element
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* @param {Object} style
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**/
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proto._removeStyles = function( style ) {
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// clean up transition styles
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var cleanStyle = {};
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for ( var prop in style ) {
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cleanStyle[ prop ] = '';
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}
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this.css( cleanStyle );
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};
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var cleanTransitionStyle = {
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transitionProperty: '',
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transitionDuration: '',
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transitionDelay: ''
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};
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proto.removeTransitionStyles = function() {
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// remove transition
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this.css( cleanTransitionStyle );
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};
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// ----- stagger ----- //
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proto.stagger = function( delay ) {
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delay = isNaN( delay ) ? 0 : delay;
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this.staggerDelay = delay + 'ms';
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};
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// ----- show/hide/remove ----- //
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// remove element from DOM
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proto.removeElem = function() {
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this.element.parentNode.removeChild( this.element );
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// remove display: none
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this.css({ display: '' });
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this.emitEvent( 'remove', [ this ] );
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};
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proto.remove = function() {
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// just remove element if no transition support or no transition
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if ( !transitionProperty || !parseFloat( this.layout.options.transitionDuration ) ) {
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this.removeElem();
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return;
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}
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// start transition
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this.once( 'transitionEnd', function() {
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this.removeElem();
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});
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this.hide();
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};
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proto.reveal = function() {
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delete this.isHidden;
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// remove display: none
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this.css({ display: '' });
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var options = this.layout.options;
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var onTransitionEnd = {};
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var transitionEndProperty = this.getHideRevealTransitionEndProperty('visibleStyle');
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onTransitionEnd[ transitionEndProperty ] = this.onRevealTransitionEnd;
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this.transition({
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from: options.hiddenStyle,
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to: options.visibleStyle,
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isCleaning: true,
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onTransitionEnd: onTransitionEnd
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});
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};
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proto.onRevealTransitionEnd = function() {
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// check if still visible
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// during transition, item may have been hidden
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if ( !this.isHidden ) {
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this.emitEvent('reveal');
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}
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};
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/**
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* get style property use for hide/reveal transition end
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* @param {String} styleProperty - hiddenStyle/visibleStyle
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* @returns {String}
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*/
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proto.getHideRevealTransitionEndProperty = function( styleProperty ) {
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var optionStyle = this.layout.options[ styleProperty ];
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// use opacity
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if ( optionStyle.opacity ) {
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return 'opacity';
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}
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// get first property
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for ( var prop in optionStyle ) {
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return prop;
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}
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};
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proto.hide = function() {
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// set flag
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this.isHidden = true;
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// remove display: none
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this.css({ display: '' });
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var options = this.layout.options;
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var onTransitionEnd = {};
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var transitionEndProperty = this.getHideRevealTransitionEndProperty('hiddenStyle');
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onTransitionEnd[ transitionEndProperty ] = this.onHideTransitionEnd;
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this.transition({
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from: options.visibleStyle,
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to: options.hiddenStyle,
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// keep hidden stuff hidden
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isCleaning: true,
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onTransitionEnd: onTransitionEnd
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});
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};
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proto.onHideTransitionEnd = function() {
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// check if still hidden
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// during transition, item may have been un-hidden
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if ( this.isHidden ) {
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this.css({ display: 'none' });
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this.emitEvent('hide');
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}
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};
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proto.destroy = function() {
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this.css({
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position: '',
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left: '',
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right: '',
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top: '',
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bottom: '',
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transition: '',
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transform: ''
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});
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};
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return Item;
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}));
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