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/*
ImageViewer v 1.1.3
Author: Sudhanshu Yadav
Copyright (c) 2015-2016 to Sudhanshu Yadav - ignitersworld.com , released under the MIT license.
Demo on: http://ignitersworld.com/lab/imageViewer.html
*/
/*** picture view plugin ****/
(function ($, window, document, undefined) {
"use strict";
//an empty function
var noop = function () {};
var $body = $('body'),
$window = $(window),
$document = $(document);
//constants
var ZOOM_CONSTANT = 15; //increase or decrease value for zoom on mouse wheel
var MOUSE_WHEEL_COUNT = 5; //A mouse delta after which it should stop preventing default behaviour of mouse wheel
//ease out method
/*
t : current time,
b : intial value,
c : changed value,
d : duration
*/
function easeOutQuart(t, b, c, d) {
t /= d;
t--;
return -c * (t * t * t * t - 1) + b;
};
// http://paulirish.com/2011/requestanimationframe-for-smart-animating/
// http://my.opera.com/emoller/blog/2011/12/20/requestanimationframe-for-smart-er-animating
// requestAnimationFrame polyfill by Erik Möller
// fixes from Paul Irish and Tino Zijdel
(function () {
var lastTime = 0;
var vendors = ['ms', 'moz', 'webkit', 'o'];
for (var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
window.requestAnimationFrame = window[vendors[x] + 'RequestAnimationFrame'];
window.cancelAnimationFrame = window[vendors[x] + 'CancelAnimationFrame'] || window[vendors[x] + 'CancelRequestAnimationFrame'];
}
if (!window.requestAnimationFrame)
window.requestAnimationFrame = function (callback, element) {
var currTime = new Date().getTime();
var timeToCall = Math.max(0, 16 - (currTime - lastTime));
var id = window.setTimeout(function () {
callback(currTime + timeToCall);
},
timeToCall);
lastTime = currTime + timeToCall;
return id;
};
if (!window.cancelAnimationFrame)
window.cancelAnimationFrame = function (id) {
clearTimeout(id);
};
}());
//function to check if image is loaded
function imageLoaded(img) {
return img.complete && (typeof img.naturalWidth === 'undefined' || img.naturalWidth !== 0);
}
var imageViewHtml = '<div class="iv-loader"></div> <div class="iv-snap-view">' + '<div class="iv-snap-image-wrap">' + '<div class="iv-snap-handle"></div>' + '</div>' + '<div class="iv-zoom-slider"><div class="iv-zoom-handle"></div></div></div>' + '<div class="iv-image-view" ><div class="iv-image-wrap" ></div></div>';
//add a full screen view
$(function () {
if(!$body.length) $body = $('body');
$body.append('<div id="iv-container">' + imageViewHtml + '<div class="iv-close"></div><div>');
});
function Slider(container, options) {
this.container = container;
this.onStart = options.onStart || noop;
this.onMove = options.onMove || noop;
this.onEnd = options.onEnd || noop;
this.sliderId = options.sliderId || 'slider' + Math.ceil(Math.random() * 1000000);
}
Slider.prototype.init = function () {
var self = this,
container = this.container,
eventSuffix = '.' + this.sliderId;
//assign event on snap image wrap
this.container.on('touchstart' + eventSuffix + ' mousedown' + eventSuffix, function (estart) {
estart.preventDefault();
var touchMove = (estart.type == "touchstart" ? "touchmove" : "mousemove") + eventSuffix,
touchEnd = (estart.type == "touchstart" ? "touchend" : "mouseup") + eventSuffix,
eOrginal = estart.originalEvent,
sx = eOrginal.clientX || eOrginal.touches[0].clientX,
sy = eOrginal.clientY || eOrginal.touches[0].clientY;
var start = self.onStart(estart, {
x: sx,
y: sy
});
if (start === false) return;
var moveListener = function (emove) {
emove.preventDefault();
eOrginal = emove.originalEvent;
//get the cordinates
var mx = eOrginal.clientX || eOrginal.touches[0].clientX,
my = eOrginal.clientY || eOrginal.touches[0].clientY;
self.onMove(emove, {
dx: mx - sx,
dy: my - sy,
mx: mx,
my: my
});
};
var endListener = function () {
$document.off(touchMove, moveListener);
$document.off(touchEnd, endListener);
self.onEnd();
};
$document.on(touchMove, moveListener);
$document.on(touchEnd, endListener);
});
return this;
}
function ImageViewer(container, options) {
var self = this;
if (container.is('#iv-container')) {
self._fullPage = true;
}
self.container = container;
options = self.options = $.extend({}, ImageViewer.defaults, options);
self.zoomValue = 100;
if (!container.find('.snap-view').length) {
container.prepend(imageViewHtml);
}
container.addClass('iv-container');
if (container.css('position') == 'static') container.css('position', 'relative');
self.snapView = container.find('.iv-snap-view');
self.snapImageWrap = container.find('.iv-snap-image-wrap');
self.imageWrap = container.find('.iv-image-wrap');
self.snapHandle = container.find('.iv-snap-handle');
self.zoomHandle = container.find('.iv-zoom-handle');
self._viewerId = 'iv' + Math.floor(Math.random() * 1000000);
}
ImageViewer.prototype = {
constructor: ImageViewer,
_init: function () {
var viewer = this,
options = viewer.options,
zooming = false, // tell weather we are zooming trough touch
container = this.container;
var eventSuffix = '.' + viewer._viewerId;
//cache dom refrence
var snapHandle = this.snapHandle;
var snapImgWrap = this.snapImageWrap;
var imageWrap = this.imageWrap;
var snapSlider = new Slider(snapImgWrap, {
sliderId: viewer._viewerId,
onStart: function () {
if (!viewer.loaded) return false;
var handleStyle = snapHandle[0].style;
this.curHandleTop = parseFloat(handleStyle.top);
this.curHandleLeft = parseFloat(handleStyle.left);
this.handleWidth = parseFloat(handleStyle.width);
this.handleHeight = parseFloat(handleStyle.height);
this.width = snapImgWrap.width();
this.height = snapImgWrap.height();
//stop momentum on image
clearInterval(imageSlider.slideMomentumCheck);
cancelAnimationFrame(imageSlider.sliderMomentumFrame);
},
onMove: function (e, position) {
var xPerc = this.curHandleLeft + position.dx * 100 / this.width,
yPerc = this.curHandleTop + position.dy * 100 / this.height;
xPerc = Math.max(0, xPerc);
xPerc = Math.min(100 - this.handleWidth, xPerc);
yPerc = Math.max(0, yPerc);
yPerc = Math.min(100 - this.handleHeight, yPerc);
var containerDim = viewer.containerDim,
imgWidth = viewer.imageDim.w * (viewer.zoomValue / 100),
imgHeight = viewer.imageDim.h * (viewer.zoomValue / 100),
imgLeft = imgWidth < containerDim.w ? (containerDim.w - imgWidth) / 2 : -imgWidth * xPerc / 100,
imgTop = imgHeight < containerDim.h ? (containerDim.h - imgHeight) / 2 : -imgHeight * yPerc / 100;
snapHandle.css({
top: yPerc + '%',
left: xPerc + '%'
})
viewer.currentImg.css({
left: imgLeft,
top: imgTop
})
}
}).init();
/*Add slide interaction to image*/
var imageSlider = viewer._imageSlider = new Slider(imageWrap, {
sliderId: viewer._viewerId,
onStart: function (e, position) {
if (!viewer.loaded) return false;
if (zooming) return;
var self = this;
snapSlider.onStart();
self.imgWidth = viewer.imageDim.w * viewer.zoomValue / 100;
self.imgHeight = viewer.imageDim.h * viewer.zoomValue / 100;
self.positions = [position, position];
self.startPosition = position;
//clear all animation frame and interval
viewer._clearFrames();
self.slideMomentumCheck = setInterval(function () {
if (!self.currentPos) return;
self.positions.shift();
self.positions.push({
x: self.currentPos.mx,
y: self.currentPos.my
})
}, 50);
},
onMove: function (e, position) {
if (zooming) return;
this.currentPos = position;
snapSlider.onMove(e, {
dx: -position.dx * snapSlider.width / this.imgWidth,
dy: -position.dy * snapSlider.height / this.imgHeight
});
},
onEnd: function () {
if (zooming) return;
var self = this;
var xDiff = this.positions[1].x - this.positions[0].x,
yDiff = this.positions[1].y - this.positions[0].y;
function momentum() {
if (step <= 60) {
self.sliderMomentumFrame = requestAnimationFrame(momentum);
}
positionX = positionX + easeOutQuart(step, xDiff / 3, -xDiff / 3, 60);
positionY = positionY + easeOutQuart(step, yDiff / 3, -yDiff / 3, 60)
snapSlider.onMove(null, {
dx: -((positionX) * snapSlider.width / self.imgWidth),
dy: -((positionY) * snapSlider.height / self.imgHeight)
});
step++;
}
if (Math.abs(xDiff) > 30 || Math.abs(yDiff) > 30) {
var step = 1,
positionX = self.currentPos.dx,
positionY = self.currentPos.dy;
momentum();
}
}
}).init();
/*Add zoom interation in mouse wheel*/
var changedDelta = 0;
imageWrap.on("mousewheel" + eventSuffix + " DOMMouseScroll" + eventSuffix, function (e) {
if(!options.zoomOnMouseWheel) return;
if (!viewer.loaded) return;
//clear all animation frame and interval
viewer._clearFrames();
// cross-browser wheel delta
var delta = Math.max(-1, Math.min(1, (e.originalEvent.wheelDelta || -e.originalEvent.detail))),
zoomValue = viewer.zoomValue * (100 + delta * ZOOM_CONSTANT) / 100;
if(!(zoomValue >= 100 && zoomValue <= options.maxZoom)){
changedDelta += Math.abs(delta);
}
else{
changedDelta = 0;
}
if(changedDelta > MOUSE_WHEEL_COUNT) return;
e.preventDefault();
var contOffset = container.offset(),
x = (e.pageX || e.originalEvent.pageX) - contOffset.left,
y = (e.pageY || e.originalEvent.pageY) - contOffset.top;
viewer.zoom(zoomValue, {
x: x,
y: y
});
//show the snap viewer
showSnapView();
});
//apply pinch and zoom feature
imageWrap.on('touchstart' + eventSuffix, function (estart) {
if (!viewer.loaded) return;
var touch0 = estart.originalEvent.touches[0],
touch1 = estart.originalEvent.touches[1];
if (!(touch0 && touch1)) {
return;
}
zooming = true;
var contOffset = container.offset();
var startdist = Math.sqrt(Math.pow(touch1.pageX - touch0.pageX, 2) + Math.pow(touch1.pageY - touch0.pageY, 2)),
startZoom = viewer.zoomValue,
center = {
x: ((touch1.pageX + touch0.pageX) / 2) - contOffset.left,
y: ((touch1.pageY + touch0.pageY) / 2) - contOffset.top
}
var moveListener = function (emove) {
emove.preventDefault();
var touch0 = emove.originalEvent.touches[0],
touch1 = emove.originalEvent.touches[1],
newDist = Math.sqrt(Math.pow(touch1.pageX - touch0.pageX, 2) + Math.pow(touch1.pageY - touch0.pageY, 2)),
zoomValue = startZoom + (newDist - startdist) / 2;
viewer.zoom(zoomValue, center);
};
var endListener = function () {
$document.off('touchmove', moveListener);
$document.off('touchend', endListener);
zooming = false;
};
$document.on('touchmove', moveListener);
$document.on('touchend', endListener);
});
//handle double tap for zoom in and zoom out
var touchtime = 0,
point;
imageWrap.on('click' + eventSuffix, function (e) {
if (touchtime == 0) {
touchtime = Date.now();
point = {
x: e.pageX,
y: e.pageY
};
} else {
if ((Date.now() - touchtime) < 500 && Math.abs(e.pageX - point.x) < 50 && Math.abs(e.pageY - point.y) < 50) {
if (viewer.zoomValue == options.zoomValue) {
viewer.zoom(200)
} else {
viewer.resetZoom()
}
touchtime = 0;
} else {
touchtime = 0;
}
}
});
//zoom in zoom out using zoom handle
var slider = viewer.snapView.find('.iv-zoom-slider');
var zoomSlider = new Slider(slider, {
sliderId: viewer._viewerId,
onStart: function (eStart) {
if (!viewer.loaded) return false;
this.leftOffset = slider.offset().left;
this.handleWidth = viewer.zoomHandle.width();
this.onMove(eStart);
},
onMove: function (e, position) {
var newLeft = (e.pageX || e.originalEvent.touches[0].pageX) - this.leftOffset - this.handleWidth / 2;
newLeft = Math.max(0, newLeft);
newLeft = Math.min(viewer._zoomSliderLength, newLeft);
var zoomValue = 100 + (options.maxZoom - 100) * newLeft / viewer._zoomSliderLength;
viewer.zoom(zoomValue);
}
}).init();
//display snapView on interaction
var snapViewTimeout, snapViewVisible;
function showSnapView(noTimeout) {
if(!options.snapView) return;
if (snapViewVisible || viewer.zoomValue <= 100 || !viewer.loaded) return;
clearTimeout(snapViewTimeout);
snapViewVisible = true;
viewer.snapView.css('opacity', 1);
if (!noTimeout) {
snapViewTimeout = setTimeout(function () {
viewer.snapView.css('opacity', 0);
snapViewVisible = false;
}, 4000);
}
}
imageWrap.on('touchmove' + eventSuffix + ' mousemove' + eventSuffix, function () {
showSnapView();
});
var snapEventsCallback = {};
snapEventsCallback['mouseenter' + eventSuffix + ' touchstart' + eventSuffix] = function () {
snapViewVisible = false;
showSnapView(true);
};
snapEventsCallback['mouseleave' + eventSuffix + ' touchend' + eventSuffix] = function () {
snapViewVisible = false;
showSnapView();
};
viewer.snapView.on(snapEventsCallback);
//calculate elments size on window resize
if (options.refreshOnResize) $window.on('resize' + eventSuffix, function () {
viewer.refresh()
});
if (viewer._fullPage) {
//prevent scrolling the backside if container if fixed positioned
container.on('touchmove' + eventSuffix + ' mousewheel' + eventSuffix + ' DOMMouseScroll' + eventSuffix, function (e) {
e.preventDefault();
});
//assign event on close button
container.find('.iv-close').on('click' + eventSuffix, function () {
viewer.hide();
});
}
},
//method to zoom images
zoom: function (perc, point) {
perc = Math.round(Math.max(100, perc));
perc = Math.min(this.options.maxZoom, perc);
point = point || {
x: this.containerDim.w / 2,
y: this.containerDim.h / 2
};
var self = this,
maxZoom = this.options.maxZoom,
curPerc = this.zoomValue,
curImg = this.currentImg,
containerDim = this.containerDim,
curLeft = parseFloat(curImg.css('left')),
curTop = parseFloat(curImg.css('top'));
self._clearFrames();
var step = 0;
//calculate base top,left,bottom,right
var containerDim = self.containerDim,
imageDim = self.imageDim;
var baseLeft = (containerDim.w - imageDim.w) / 2,
baseTop = (containerDim.h - imageDim.h) / 2,
baseRight = containerDim.w - baseLeft,
baseBottom = containerDim.h - baseTop;
function zoom() {
step++;
if (step < 20) {
self._zoomFrame = requestAnimationFrame(zoom);
}
var tickZoom = easeOutQuart(step, curPerc, perc - curPerc, 20);
var ratio = tickZoom / curPerc,
imgWidth = self.imageDim.w * tickZoom / 100,
imgHeight = self.imageDim.h * tickZoom / 100,
newLeft = -((point.x - curLeft) * ratio - point.x),
newTop = -((point.y - curTop) * ratio - point.y);
//fix for left and top
newLeft = Math.min(newLeft, baseLeft);
newTop = Math.min(newTop, baseTop);
//fix for right and bottom
if((newLeft + imgWidth) < baseRight){
newLeft = baseRight - imgWidth; //newLeft - (newLeft + imgWidth - baseRight)
}
if((newTop + imgHeight) < baseBottom){
newTop = baseBottom - imgHeight; //newTop + (newTop + imgHeight - baseBottom)
}
curImg.css({
height: imgHeight + 'px',
width: imgWidth + 'px',
left: newLeft + 'px',
top: newTop + 'px'
});
self.zoomValue = tickZoom;
self._resizeHandle(imgWidth, imgHeight, newLeft, newTop);
//update zoom handle position
self.zoomHandle.css('left', ((tickZoom - 100) * self._zoomSliderLength) / (maxZoom - 100) + 'px');
}
zoom();
},
_clearFrames: function () {
clearInterval(this._imageSlider.slideMomentumCheck);
cancelAnimationFrame(this._imageSlider.sliderMomentumFrame);
cancelAnimationFrame(this._zoomFrame)
},
resetZoom: function () {
this.zoom(this.options.zoomValue);
},
//calculate dimensions of image, container and reset the image
_calculateDimensions: function () {
//calculate content width of image and snap image
var self = this,
curImg = self.currentImg,
container = self.container,
snapView = self.snapView,
imageWidth = curImg.width(),
imageHeight = curImg.height(),
contWidth = container.width(),
contHeight = container.height(),
snapViewWidth = snapView.innerWidth(),
snapViewHeight = snapView.innerHeight();
//set the container dimension
self.containerDim = {
w: contWidth,
h: contHeight
}
//set the image dimension
var imgWidth, imgHeight, ratio = imageWidth / imageHeight;
imgWidth = (imageWidth > imageHeight && contHeight >= contWidth) || ratio * contHeight > contWidth ? contWidth : ratio * contHeight;
imgHeight = imgWidth / ratio;
self.imageDim = {
w: imgWidth,
h: imgHeight
}
//reset image position and zoom
curImg.css({
width: imgWidth + 'px',
height: imgHeight + 'px',
left: (contWidth - imgWidth) / 2 + 'px',
top: (contHeight - imgHeight) / 2 + 'px',
'max-width': 'none',
'max-height': 'none'
});
//set the snap Image dimension
var snapWidth = imgWidth > imgHeight ? snapViewWidth : imgWidth * snapViewHeight / imgHeight,
snapHeight = imgHeight > imgWidth ? snapViewHeight : imgHeight * snapViewWidth / imgWidth;
self.snapImageDim = {
w: snapWidth,
h: snapHeight
}
self.snapImg.css({
width: snapWidth,
height: snapHeight
});
//calculate zoom slider area
self._zoomSliderLength = snapViewWidth - self.zoomHandle.outerWidth();
},
refresh: function () {
if (!this.loaded) return;
this._calculateDimensions();
this.resetZoom();
},
_resizeHandle: function (imgWidth, imgHeight, imgLeft, imgTop) {
var curImg = this.currentImg,
imageWidth = imgWidth || this.imageDim.w * this.zoomValue / 100,
imageHeight = imgHeight || this.imageDim.h * this.zoomValue / 100,
left = Math.max(-(imgLeft || parseFloat(curImg.css('left'))) * 100 / imageWidth, 0),
top = Math.max(-(imgTop || parseFloat(curImg.css('top'))) * 100 / imageHeight, 0),
handleWidth = Math.min(this.containerDim.w * 100 / imageWidth, 100),
handleHeight = Math.min(this.containerDim.h * 100 / imageHeight, 100);
this.snapHandle.css({
top: top + '%',
left: left + '%',
width: handleWidth + '%',
height: handleHeight + '%'
});
},
show: function (image, hiResImg) {
if (this._fullPage) {
this.container.show();
if (image) this.load(image, hiResImg);
}
},
hide: function () {
if (this._fullPage) {
this.container.hide();
}
},
options: function (key, value) {
if (!value) return this.options[key];
this.options[key] = value;
},
destroy: function (key, value) {
var eventSuffix = '.' + this._viewerId;
if (this._fullPage) {
container.off(eventSuffix);
container.find('[class^="iv"]').off(eventSuffix);
} else {
this.container.remove('[class^="iv"]');
}
$window.off(eventSuffix);
return null;
},
load: function (image, hiResImg) {
var self = this,
container = this.container;
container.find('.iv-snap-image,.iv-large-image').remove();
var snapImageWrap = this.container.find('.iv-snap-image-wrap');
snapImageWrap.prepend('<img class="iv-snap-image" src="' + image + '" />');
this.imageWrap.prepend('<img class="iv-large-image" src="' + image + '" />');
if (hiResImg) {
this.imageWrap.append('<img class="iv-large-image" src="' + hiResImg + '" />')
}
var currentImg = this.currentImg = this.container.find('.iv-large-image');
this.snapImg = this.container.find('.iv-snap-image');
self.loaded = false;
//show loader
container.find('.iv-loader').show();
currentImg.hide();
self.snapImg.hide();
//refresh the view
function refreshView() {
self.loaded = true;
self.zoomValue = 100;
//reset zoom of images
currentImg.show();
self.snapImg.show();
self.refresh();
self.resetZoom();
//hide loader
container.find('.iv-loader').hide();
}
if (imageLoaded(currentImg[0])) {
refreshView();
} else {
$(currentImg[0]).on('load', refreshView);
}
}
}
ImageViewer.defaults = {
zoomValue: 100,
snapView: true,
maxZoom: 500,
refreshOnResize: true,
zoomOnMouseWheel : true
}
window.ImageViewer = function (container, options) {
var imgElm, imgSrc, hiResImg;
if (!(container && (typeof container == "string" || container instanceof Element || container[0] instanceof Element))) {
options = container;
container = $('#iv-container');
}
container = $(container);
if (container.is('img')) {
imgElm = container;
imgSrc = imgElm[0].src;
hiResImg = imgElm.attr('high-res-src') || imgElm.attr('data-high-res-src');
container = imgElm.wrap('<div class="iv-container" style="display:inline-block; overflow:hidden"></div>').parent();
imgElm.css({
opacity: 0,
position: 'relative',
zIndex: -1
});
} else {
imgSrc = container.attr('src') || container.attr('data-src');
hiResImg = container.attr('high-res-src') || container.attr('data-high-res-src');
}
var viewer = new ImageViewer(container, options);
viewer._init();
if (imgSrc) viewer.load(imgSrc, hiResImg);
return viewer;
};
$.fn.ImageViewer = function (options) {
return this.each(function () {
var $this = $(this);
var viewer = window.ImageViewer($this, options);
$this.data('ImageViewer', viewer);
});
}
}((window.jQuery), window, document));