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class CoverImage { |
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constructor($el, cb) { |
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const _this = this; |
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_this.$el = $el ? jQuery($el) : jQuery(window); |
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_this.$img = _this.getElementForSizing(); |
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_this.disableOnMobile = _this.$el.data('cover-image-mobile') === false; |
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_this.cb = cb || (() => { |
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//DEBUG console.log("Default callback"); |
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}); |
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_this.positioning = { |
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x : 0.5, |
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y : 0.5 |
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}; |
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_this.options = { |
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parallax : _this.$el.data('coverImageParallax') === '' |
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}; |
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if (!_this.$img) { |
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console.log('Error:', 'no image found', _this.$img ); |
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return; |
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} |
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_this.imageWidth = _this.$img.attr('width'); |
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_this.imageHeight = _this.$img.attr('height'); |
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// If the image doesn't have harcoded width|height |
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// attributes then load the image to calculate |
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// the dimensions |
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if (!_this.imageWidth || !_this.imageHeight) { |
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console.log('No dimensions found. Generating image') |
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_this.img = new Image(); |
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_this.img.src = _this.$img.attr('src'); |
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_this.imageWidth = _this.img.width; |
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_this.imageHeight = _this.img.height; |
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} |
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if ( _this.disableOnMobile && window.innerWidth < 480 ) { |
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return; |
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} |
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_this.elementDimensions = { |
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height : _this.$el.outerHeight(), |
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width : _this.$el.outerWidth() |
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}; |
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_this.$el.css({ |
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overflow : 'hidden', |
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position : 'relative' |
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}); |
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if (!_this.$img.length) { |
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// TODO: Implement load |
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setTimeout( () => { |
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new CoverImage( _this.$el ); |
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}, 1000); |
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} else { |
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_this.resizeImage(); |
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} |
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_this.$img.one('load', () => { |
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console.log('Image loaded:', 'resize'); |
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_this.resizeImage(); |
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}); |
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$(window).on('resize', () => { |
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_this.resizeImage(); |
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}); |
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$(window).on('ci.resize', () => { |
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_this.resizeImage(); |
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}); |
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if (_this.options.parallax) { |
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_this.draw(); |
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} |
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} |
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/** |
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* Parallax FX |
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* |
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*/ |
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View Code Duplication |
draw() { |
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const _this = this; |
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const friction = 0.5; |
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const imageOffsetX = document.body.scrollTop * friction; |
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const imageOffsetY = document.body.scrollTop * friction; |
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const maximumMovementY = ( _this.imageDimensions.height - _this.elementDimensions.height) * _this.positioning.y; |
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const maximumMovementX = ( _this.imageDimensions.width - _this.elementDimensions.width) * _this.positioning.x; |
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if ( maximumMovementX > 0 ) { |
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if (imageOffsetX < maximumMovementX ) { |
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// console.log('New position:', maximumMovementX - imageOffsetX); |
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_this.$img.css({ |
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'transform': `translateX(${maximumMovementX - imageOffsetX}px)` |
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}); |
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} |
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} else { |
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if ( imageOffsetY < maximumMovementY ) { |
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_this.$img.css('transform', `translateY(${maximumMovementY - imageOffsetY}px)`); |
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} |
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} |
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window.requestAnimationFrame(() => { |
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_this.draw(); |
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}); |
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} |
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getElementForSizing() { |
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const _this = this; |
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const selector = _this.$el.data('coverImageEl'); |
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if ( selector ) { |
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console.log( 'Element selector Present', _this.$el.find( selector ) ); |
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return _this.$el.find( selector ) ? _this.$el.find( selector ) : _this.$el.find('img'); |
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} |
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return _this.$el.find('img').first(); |
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} |
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resizeImage() { |
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const _this = this; |
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const dimensions = _this.coverDimensions( _this.imageWidth, _this.imageHeight, _this.$el.outerWidth(), _this.$el.outerHeight() ); |
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_this.imageDimensions = dimensions; |
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if ( isNaN( dimensions.width ) ) { |
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console.log('Failed to calculate image sizes.'); |
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} |
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_this.setImageSize(); |
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} |
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setImageSize() { |
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const _this = this; |
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_this.$img.attr({ |
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'width' : _this.imageDimensions.width, |
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'height' : _this.imageDimensions.height |
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}).css({ |
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'position' : 'absolute', |
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'width' : _this.imageDimensions.width, |
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'height' : _this.imageDimensions.height, |
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'transform' : _this.getTransform( |
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( _this.$el.width() - _this.imageDimensions.width) * _this.positioning.y, |
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( _this.$el.outerHeight() - _this.imageDimensions.height) * _this.positioning.x |
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), |
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'max-width' : 'none' |
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}).data('resrc-width', _this.imageDimensions.width); |
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_this.$img.addClass('ci--sized'); |
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_this.cb(); |
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} |
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getTransform(x, y) { |
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return `translate3d(${x}px,${y}px,0)`; |
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} |
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coverDimensions(child_w, child_h, container_w, container_h) { |
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const scale_factor = this.max( container_w / child_w, container_h / child_h ); |
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return { |
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width: Math.ceil(child_w * scale_factor), |
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height: Math.ceil(child_h * scale_factor) |
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}; |
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} |
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containDimensions(child_w, child_h, container_w, container_h) { |
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const scale_factor = this.min( container_w / child_w, container_h / child_h ); |
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return { |
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width: child_w * scale_factor, |
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height: child_h * scale_factor |
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}; |
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} |
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min(a, b) { |
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return a > b ? b : a; |
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} |
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max(a, b) { |
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return a > b ? a : b; |
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} |
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} |
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const elems = document.body.querySelectorAll('[data-cover-image]'); |
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elems.forEach(el => { |
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new CoverImage( jQuery(el) ); |
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}); |
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thisislawatts /
coverimage
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