Image Zoom
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FILE: js/enhance.js
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+function ($) { "use strict";
/**
* The zoom service
*/
function ZoomService () {
this._activeZoom =
this._initialScrollPosition =
this._initialTouchPosition =
this._touchMoveListener = null
this._$document = $(document)
this._$window = $(window)
this._$body = $(document.body)
this._boundClick = $.proxy(this._clickHandler, this)
}
ZoomService.prototype.listen = function () {
this._$body.on('click', '[data-action="zoom"]', $.proxy(this._zoom, this))
}
ZoomService.prototype._zoom = function (e) {
var target = e.target
if (!target || target.tagName != 'IMG') return
if (this._$body.hasClass('zoom-overlay-open')) return
if (e.metaKey || e.ctrlKey) return window.open(e.target.src, '_blank')
if (target.width >= (window.innerWidth - Zoom.OFFSET)) return
this._activeZoomClose(true)
this._activeZoom = new Zoom(target)
this._activeZoom.zoomImage()
// todo(fat): probably worth throttling this
this._$window.on('scroll.zoom', $.proxy(this._scrollHandler, this))
this._$document.on('keyup.zoom', $.proxy(this._keyHandler, this))
this._$document.on('touchstart.zoom', $.proxy(this._touchStart, this))
// we use a capturing phase here to prevent unintended js events
// sadly no useCapture in jquery api (http://bugs.jquery.com/ticket/14953)
document.addEventListener('click', this._boundClick, true)
e.stopPropagation()
}
ZoomService.prototype._activeZoomClose = function (forceDispose) {
if (!this._activeZoom) return
if (forceDispose) {
this._activeZoom.dispose()
} else {
this._activeZoom.close()
}
this._$window.off('.zoom')
this._$document.off('.zoom')
document.removeEventListener('click', this._boundClick, true)
this._activeZoom = null
}
ZoomService.prototype._scrollHandler = function (e) {
if (this._initialScrollPosition === null) this._initialScrollPosition = window.scrollY
var deltaY = this._initialScrollPosition - window.scrollY
if (Math.abs(deltaY) >= 40) this._activeZoomClose()
}
ZoomService.prototype._keyHandler = function (e) {
if (e.keyCode == 27) this._activeZoomClose()
}
ZoomService.prototype._clickHandler = function (e) {
e.stopPropagation()
e.preventDefault()
this._activeZoomClose()
}
ZoomService.prototype._touchStart = function (e) {
this._initialTouchPosition = e.touches[0].pageY
$(e.target).on('touchmove.zoom', $.proxy(this._touchMove, this))
}
ZoomService.prototype._touchMove = function (e) {
if (Math.abs(e.touches[0].pageY - this._initialTouchPosition) > 10) {
this._activeZoomClose()
$(e.target).off('touchmove.zoom')
}
}
/**
* The zoom object
*/
function Zoom (img) {
this._fullHeight =
this._fullWidth =
this._overlay =
this._targetImageWrap = null
this._targetImage = img
this._$body = $(document.body)
this._transitionDuration = 300
}
Zoom.OFFSET = 80 //margins
Zoom.prototype.zoomImage = function () {
var img = document.createElement('img')
img.onload = $.proxy(function () {
this._fullHeight = Number(img.height)
this._fullWidth = Number(img.width)
this._zoomOriginal()
}, this)
img.src = this._targetImage.src
}
Zoom.prototype._zoomOriginal = function () {
this._targetImageWrap = document.createElement('div')
this._targetImageWrap.className = 'zoom-img-wrap'
this._targetImage.parentNode.insertBefore(this._targetImageWrap, this._targetImage)
this._targetImageWrap.appendChild(this._targetImage)
$(this._targetImage)
.addClass('zoom-img')
.attr('data-action', 'zoom-out')
this._overlay = document.createElement('div')
this._overlay.className = 'zoom-overlay'
document.body.appendChild(this._overlay)
this._calculateZoom()
this._triggerAnimation()
}
Zoom.prototype._calculateZoom = function () {
this._targetImage.offsetWidth // repaint before animating
var originalFullImageWidth = this._fullWidth
var originalFullImageHeight = this._fullHeight
var scrollTop = window.scrollY
var viewportHeight = (window.innerHeight - Zoom.OFFSET)
var viewportWidth = (window.innerWidth - Zoom.OFFSET)
var viewportAspectRatio = viewportWidth / viewportHeight
var imageAspectRatio = originalFullImageWidth / originalFullImageHeight
var imageTargetAspectRatio = this._targetImage.width / this._targetImage.height
this._trueHeight = this._targetImage.height
this._trueWidth = this._targetImage.width
if (imageAspectRatio < imageTargetAspectRatio) {
this._trueHeight = (this._fullHeight * this._targetImage.width) / this._fullWidth
} else {
this._trueWidth = (this._fullWidth * this._targetImage.height) / this._fullHeight
}
var maxScaleFactor = originalFullImageWidth / this._trueWidth
if (originalFullImageWidth < viewportWidth && originalFullImageHeight < viewportHeight) {
this._imgScaleFactor = maxScaleFactor
} else if (imageAspectRatio < viewportAspectRatio) {
this._imgScaleFactor = (viewportHeight / originalFullImageHeight) * maxScaleFactor
} else {
this._imgScaleFactor = (viewportWidth / originalFullImageWidth) * maxScaleFactor
}
}
Zoom.prototype._triggerAnimation = function () {
this._targetImage.offsetWidth // repaint before animating
var imageOffset = $(this._targetImage).offset()
var scrollTop = $(window).scrollTop()
var viewportY = scrollTop + (window.innerHeight / 2)
var viewportX = (window.innerWidth / 2)
var imageCenterY = imageOffset.top + (this._trueHeight / 2)
var imageCenterX = imageOffset.left + (this._trueWidth / 2)
this._translateY = viewportY - imageCenterY
this._translateX = viewportX - imageCenterX
$(this._targetImage).velocity({
scale: this._imgScaleFactor,
height: this._trueHeight,
width: this._trueWidth,
}, this._transitionDuration);
$(this._targetImageWrap).velocity({
translateX: this._translateX,
translateY: this._translateY,
translateZ: 0,
}, this._transitionDuration);
this._$body.addClass('zoom-overlay-open')
}
Zoom.prototype.close = function () {
this._$body
.removeClass('zoom-overlay-open')
.addClass('zoom-overlay-transitioning')
$(this._targetImage).velocity('reverse', { duration: this._transitionDuration });
var myself = this
$(this._targetImageWrap).velocity(
{
translateX: 0,
translateY: 0,
},
{
duration: this._transitionDuration,
complete: function(elements) {
myself.dispose() // should probably use proxy here
}
});
}
Zoom.prototype.dispose = function () {
if (this._targetImageWrap && this._targetImageWrap.parentNode) {
$(this._targetImage)
.removeClass('zoom-img')
.attr('data-action', 'zoom')
.css({'width': '','height': '', 'transform': ''})
this._targetImageWrap.parentNode.replaceChild(this._targetImage, this._targetImageWrap)
this._overlay.parentNode.removeChild(this._overlay)
this._$body.removeClass('zoom-overlay-transitioning')
}
}
// wait for dom ready (incase script included before body)
$(function () {
new ZoomService().listen()
})
}(jQuery)
:sparkles: Demo :sparkles:
