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const elementResizeDetectorMaker = require('element-resize-detector'); |
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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.$el = el ? el : window; |
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_this.$img = _this.getElementForSizing(); |
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_this.disableOnMobile = _this.$el.dataset['cover-image-mobile'] === 'false'; |
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_this.cb = cb || (() => { |
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//DEBUG console.log("Default callback"); |
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}); |
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_this.positioning = { |
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x : 0.5, |
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y : 0.5 |
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}; |
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_this.options = { |
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parallax : _this.$el.dataset.coverImageParallax === 'true' |
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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.$img.getAttribute('width'); |
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_this.imageHeight = _this.$img.getAttribute('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:', _this.$img.src) |
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_this.img = new Image(); |
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_this.img.src = _this.$img.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.$el.clientHeight, |
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width : _this.$el.clientWidth |
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}; |
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_this.$el.style = ` |
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overflow : hidden; |
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position : relative; |
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`; |
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if (!_this.$img) { |
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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.addEventListener('load', () => { |
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_this.resizeImage(); |
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}, false); |
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_this.$el.addEventListener('transitionend', () => { |
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_this.resizeImage(); |
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}, false) |
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var erd = elementResizeDetectorMaker({ |
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strategy: 'scroll' |
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}); |
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erd.listenTo(_this.$el, () => { |
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_this.resizeImage(); |
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}) |
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_this.$el.addEventListener('animationend', () => { |
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_this.resizeImage(); |
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}, false) |
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window.addEventListener('resize', () => { |
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_this.resizeImage(); |
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}, true); |
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window.addEventListener('ci.resize', () => { |
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_this.resizeImage(); |
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}, true); |
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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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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(${maximumMovementY - imageOffsetY}px)`); |
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} |
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} |
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window.requestAnimationFrame(() => { |
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_this.draw(); |
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}); |
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} |
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/** |
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* |
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* @return DOM Element |
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*/ |
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getElementForSizing() { |
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let _this = this; |
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let selector = _this.$el.dataset['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.$el.querySelector('img'); |
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} |
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resizeImage() { |
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const _this = this; |
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const elementWidth = _this.$el.clientWidth; |
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const elementHeight = _this.$el.clientHeight; |
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const dimensions = _this.coverDimensions( _this.imageWidth, _this.imageHeight, elementWidth, elementHeight ); |
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_this.imageDimensions = dimensions; |
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if ( isNaN( dimensions.width ) ) { |
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console.log('Failed to calculate image sizes.'); |
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} |
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_this.setImageSize(); |
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} |
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setImageSize() { |
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const _this = this; |
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_this.$img.width = _this.imageDimensions.width; |
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_this.$img.height = _this.imageDimensions.height; |
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let transform = _this.getTransform( |
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( _this.$el.clientWidth - _this.imageDimensions.width) * _this.positioning.y, |
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( _this.$el.clientHeight - _this.imageDimensions.height) * _this.positioning.x |
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); |
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_this.$img.style = ` |
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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: ${transform}; |
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max-width: none; |
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`; |
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_this.$img.classList.add('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( el ); |
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}); |
thisislawatts /
coverimage
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