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jquery.fs.zoomer.js
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jquery.fs.zoomer.js
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/*
* Zoomer v3.1.0 - 2015-12-39
* A jQuery plugin for smooth image exploration. Part of the formstone library.
* http://classic.formstone.it/components/zoomer/
*
* Copyright 2015 Ben Plum; MIT Licensed
* Marc Brooks; MIT Licensed
*/
;(function ($, window) {
"use strict";
var $window = $(window),
$instances,
animating = false,
transformSupported = false;
/**
* @options
* @param callback [function] <$.noop> ""
* @param controls.postion [string] <"bottom"> "Position of default controls"
* @param controls.zoomIn [string] <> "Custom zoom control selector"
* @param controls.zoomOut [string] <> "Custom zoom control selector"
* @param controls.next [string] <> "Custom pagination control selector"
* @param controls.previous [string] <> "Custom pagination control selector"
* @param customClass [string] <''> "Class applied to instance"
* @param enertia [number] <0.2> "Zoom smoothing (0.1 = butter, 0.9 = sandpaper)"
* @param increment [number] <0.01> "Zoom speed (0.01 = tortoise, 0.1 = hare)"
* @param marginMin [] <> ""
* @param marginMax [] <> ""
* @param retina [boolean] <false> "Flag for retina image support"
* @param source [string | object] <null> "Source image (string) or tiles (object)"
*/
var options = {
callback: $.noop,
controls: {
position: "bottom",
zoomIn: null,
zoomOut: null,
next: null,
previous: null
},
customClass: "",
enertia: 0.2,
increment: 0.01,
marginMin: 30, // Min bounds
marginMax: 100, // Max bounds
retina: false,
source: null
};
// Internal data
var properties = {
images: [],
aspect: "",
action: "",
lastAction: "",
keyDownTime: 0,
marginReal: 0,
originalDOM: "",
// Gallery
gallery: false,
index: 0,
// Tiles
$tiles: null,
tiled: false,
tilesTotal: 0,
tilesLoaded: 0,
tiledColumns: 0,
tiledRows: 0,
tiledHeight: 0,
tiledWidth: 0,
tiledThumbnail: null,
// Frame
centerLeft: 0,
centerTop: 0,
frameHeight: 0,
frameWidth: 0,
// Original image
naturalHeight: 0,
naturalWidth: 0,
imageRatioWide: 0,
imageRatioTall: 0,
// Dimensions
minHeight: null,
minWidth: null,
maxHeight: 0,
maxWidth: 0,
// Bounds
boundsTop: 0,
boundsBottom: 0,
boundsLeft: 0,
boundsRight: 0,
// Image
imageWidth: 0,
imageHeight: 0,
imageLeft: 0,
imageTop: 0,
targetImageWidth: 0,
targetImageHeight: 0,
targetImageLeft: 0,
targetImageTop: 0,
oldImageWidth: 0,
oldImageHeight: 0,
// Positioner
positionerLeft: 0,
positionerTop: 0,
targetPositionerLeft: 0,
targetPositionerTop: 0,
// Zoom
zoomPositionLeft: 0,
zoomPositionTop: 0,
// Touch Support
offset: null,
touches: [],
zoomPercentage: 1,
pinchStartX0: 0,
pinchStartX1: 0,
pinchStartY0: 0,
pinchStartY1: 0,
pinchEndX0: 0,
pinchEndX1: 0,
pinchEndY0: 0,
pinchEndY1: 0,
lastPinchEndX0: 0,
lastPinchEndY0: 0,
lastPinchEndX1: 0,
lastPinchEndY1: 0,
pinchDeltaStart: 0,
pinchDeltaEnd: 0
};
/**
* @events
* @event zoomer.loaded "Source media loaded"
*/
var pub = {
/**
* @method
* @name defaults
* @description Sets default plugin options
* @param opts [object] <{}> "Options object"
* @example $.zoomer("defaults", opts);
*/
defaults: function(opts) {
options = $.extend(options, opts || {});
return (typeof this === 'object') ? $(this) : true;
},
/**
* @method
* @name destroy
* @description Removes instance of plugin
* @example $(".target").zoomer("destroy");
*/
destroy: function() {
var $targets = $(this).each(function(i, target) {
var data = $(target).data("zoomer");
if (data) {
$window.off(".zoomer");
data.$holder.off(".zoomer");
data.$zoomer.off(".zoomer");
data.controls.$zoomIn.off(".zoomer");
data.controls.$zoomOut.off(".zoomer");
data.controls.$next.off(".zoomer");
data.controls.$previous.off(".zoomer");
data.$target.removeClass("zoomer-element")
.data("zoomer", null)
.empty()
.append(data.originalDOM);
}
});
$instances = $(".zoomer-element");
if ($instances.length < 1) {
_clearAnimation();
}
return $targets;
},
/**
* @method
* @name load
* @description Loads source media
* @param source [string | object] "Source image (string) or tiles (object)"
* @example $(".target").zoomer("load", "path/to/image.jpg");
*/
load: function(source) {
return $(this).each(function(i, target) {
var data = $(target).data("zoomer");
if (data) {
data.source = source;
data.index = 0;
data = _normalizeSource(data);
_load(data);
}
});
},
/**
* @method
* @name pan
* @description Pans plugin instances
* @param left [int] "Percentage to pan to (50 = half)"
* @param top [int] "Percentage to pan to (50 = half)"
* @example $(".target").zoomer("pan", 50, 50);
*/
pan: function(left, top) {
return $(this).each(function(i, target) {
var data = $(target).data("zoomer");
if (data) {
left /= 100;
top /= 100;
data.targetPositionerLeft = Math.round(data.centerLeft - data.targetImageLeft - (data.targetImageWidth * left));
data.targetPositionerTop = Math.round(data.centerTop - data.targetImageTop - (data.targetImageHeight * top));
}
});
},
/**
* @method
* @name resize
* @description Resizes plugin instange
* @example $(".target").zoomer("resize");
*/
resize: function() {
return $(this).each(function(i, target) {
var data = $(target).data("zoomer");
if (data) {
data.frameWidth = data.$target.outerWidth();
data.frameHeight = data.$target.outerHeight();
data.centerLeft = Math.round(data.frameWidth * 0.5);
data.centerTop = Math.round(data.frameHeight * 0.5);
// Set minHeight and minWidth to naturals sizes
data.minHeight = data.naturalHeight;
data.minWidth = data.naturalWidth;
// Recalculate minimum sizes only when the natural size of the image is bigger than the frame size - marginalReal
if (data.naturalHeight > (data.frameHeight - data.marginReal) || data.naturalWidth > (data.frameWidth - data.marginReal)) {
data = _setMinimums(data);
}
}
});
},
/**
* @method
* @name unload
* @description Unload image from plugins instances
* @example $(".target").zoomer("unload");
*/
unload: function() {
return $(this).each(function() {
var data = $(this).data("zoomer");
if (data && typeof data.$image !== 'undefined') {
data.$image.remove();
}
});
}
};
/**
* @method private
* @name _init
* @description Initializes plugin
* @param opts [object] "Initialization options"
*/
function _init(opts) {
// Settings
opts = $.extend({}, options, properties, opts);
transformSupported = _getTransform3DSupport();
// Apply to each element
var $items = $(this);
for (var i = 0, count = $items.length; i < count; i++) {
_build($items.eq(i), opts);
}
// Start main animation loop
$instances = $(".zoomer-element");
_startAnimation();
return $items;
}
/**
* @method private
* @name _build
* @description Builds each instance
* @param $target [jQuery object] "Target jQuery object"
* @param data [object] <{}> "Options object"
*/
function _build($target, data) {
if (!$target.data("zoomer")) {
data = $.extend({}, data, $target.data("zoomer-options"));
var $targetParent = $target.parent(); // have to get the parent before we empty the target below
data.$target = $target;
data.marginReal = data.marginMin * 2;
data.originalDOM = data.$target.html();
if (data.$target.find("img").length > 0) {
data.source = [];
data.$target.find("img").each(function() {
data.source.push($(this).attr("src"));
});
data.$target.empty();
}
data = _normalizeSource(data);
// Assemble HTML
var html = '<div class="zoomer ' + data.customClass + '">';
html += '<div class="zoomer-positioner">';
html += '<div class="zoomer-holder">';
html += '</div>';
html += '</div>';
html += '</div>';
data.$zoomer = $(html);
data.$target.addClass("zoomer-element")
.html(data.$zoomer);
if (data.controls.zoomIn || data.controls.zoomOut || data.controls.next || data.controls.previous) {
data.controls.$zoomIn = $(data.controls.zoomIn, $targetParent);
data.controls.$zoomOut = $(data.controls.zoomOut, $targetParent);
data.controls.$next = $(data.controls.next, $targetParent);
data.controls.$previous = $(data.controls.previous, $targetParent);
} else {
html = '<div class="zoomer-controls zoomer-controls-' + data.controls.position + '">';
html += '<span class="zoomer-previous">‹</span>';
html += '<span class="zoomer-zoom-out">-</span>';
html += '<span class="zoomer-zoom-in">+</span>';
html += '<span class="zoomer-next">›</span>';
html += '</div>';
data.$zoomer.append(html);
data.controls.$default = data.$zoomer.find(".zoomer-controls");
data.controls.$zoomIn = data.$zoomer.find(".zoomer-zoom-in");
data.controls.$zoomOut = data.$zoomer.find(".zoomer-zoom-out");
data.controls.$next = data.$zoomer.find(".zoomer-next");
data.controls.$previous = data.$zoomer.find(".zoomer-previous");
}
// Cache jquery objects
data.$positioner = data.$zoomer.find(".zoomer-positioner");
data.$holder = data.$zoomer.find(".zoomer-holder");
// Bind events
data.controls.$zoomIn.on("touchstart.zoomer mousedown.zoomer", data, _zoomIn)
.on("touchend.zoomer mouseup.zoomer", data, _clearZoom);
data.controls.$zoomOut.on("touchstart.zoomer mousedown.zoomer", data, _zoomOut)
.on("touchend.zoomer mouseup.zoomer", data, _clearZoom);
data.controls.$next.on("click.zoomer", data, _nextImage);
data.controls.$previous.on("click.zoomer", data, _previousImage);
data.$zoomer.on("mousedown.zoomer", data, _dragStart)
.on("touchstart.zoomer MSPointerDown.zoomer", ":not(.zoomer-controls)", data, _onTouch);
// Kick it off
data.$target.data("zoomer", data);
pub.resize.apply(data.$target);
if (data.images.length > 0) {
_load.apply(data.$target, [ data ]);
}
}
}
/**
* @method private
* @name _load
* @description Delegates loading action
* @param data [object] "Instance data"
*/
function _load(data) {
// If gallery
if (data.gallery) {
data.$zoomer.addClass("zoomer-gallery");
} else {
data.$zoomer.removeClass("zoomer-gallery");
}
if (typeof data.$image !== "undefined") {
data.$holder.animate({ opacity: 0 }, 300, function() {
pub.unload.apply(data.$target);
_loadImage.apply(data.$target, [ data, data.images[data.index] ]);
});
} else {
_loadImage.apply(data.$target, [ data, data.images[data.index] ]);
}
}
/**
* @method private
* @name _loadImage
* @description Handles loading an image or set of tiles
* @param data [object] "Instance data"
* @param source [string | object] "Source URL or object"
*/
function _loadImage(data, source) {
data.loading = true;
if (data.tiled) {
data.tilesTotal = 0;
data.tilesLoaded = 0;
var html = '<div class="zoomer-tiles">';
for (var i in data.images[0]) {
if (data.images[0].hasOwnProperty(i)) {
for (var j in data.images[0][i]) {
if (data.images[0][i].hasOwnProperty(j)) {
html += '<img class="zoomer-image zoomer-tile" src="' + data.images[0][i][j] + '" data-zoomer-tile="' + i + '-' + j + '" />';
data.tilesTotal++;
}
}
}
}
html += '</div>';
data.$image = $(html);
data.$tiles = data.$image.find("img");
data.$tiles.each(function(i, img) {
var $img = $(img);
$img.one("load", data, _onTileLoad);
if ($img[0].complete) {
$img.trigger("load");
}
});
} else {
// Cache current image
data.$image = $('<img class="zoomer-image" />');
data.$image.one("load.zoomer", data, _onImageLoad)
.attr("src", source);
// If image has already loaded into cache, trigger load event
if (data.$image[0].complete) {
data.$image.trigger("load");
}
}
}
/**
* @method private
* @name _onTileLoad
* @description Handles tile load
* @param e [object] "Event data"
*/
function _onTileLoad(e) {
var data = e.data;
data.tilesLoaded++;
if (data.tilesLoaded === data.tilesTotal) {
data.tiledRows = data.images[0].length;
data.tiledColumns = data.images[0][0].length;
data.tiledHeight = data.$tiles.eq(0)[0].naturalHeight * data.tiledRows;
data.tiledWidth = data.$tiles.eq(0)[0].naturalWidth * data.tiledColumns;
_onImageLoad({ data: data });
}
}
/**
* @method private
* @name _onImageLoad
* @description Handles image load
* @param e [object] "Event data"
*/
function _onImageLoad(e) {
var data = e.data;
if (data.tiled) {
data.naturalHeight = data.tiledHeight;
data.naturalWidth = data.tiledWidth;
} else {
data.naturalHeight = data.$image[0].naturalHeight;
data.naturalWidth = data.$image[0].naturalWidth;
}
if (data.retina) {
data.naturalHeight /= 2;
data.naturalWidth /= 2;
}
data.$holder.css({
height: data.naturalHeight,
width: data.naturalWidth
});
// Set target, min, max to naturals sizes
data.targetImageHeight = data.minHeight = data.maxHeight = data.naturalHeight;
data.targetImageWidth = data.minWidth = data.maxWidth = data.naturalWidth;
data.imageRatioWide = data.naturalWidth / data.naturalHeight;
data.imageRatioTall = data.naturalHeight / data.naturalWidth;
// Initial sizing to fit screen
if (data.naturalHeight > (data.frameHeight - data.marginReal) || data.naturalWidth > (data.frameWidth - data.marginReal)) {
data = _setMinimums(data);
data.targetImageHeight = data.minHeight;
data.targetImageWidth = data.minWidth;
}
// SET INITIAL POSITIONS
data.positionerLeft = data.targetPositionerLeft = data.centerLeft;
data.positionerTop = data.targetPositionerTop = data.centerTop;
data.imageLeft = data.targetImageLeft = Math.round(-data.targetImageWidth / 2);
data.imageTop = data.targetImageTop = Math.round(-data.targetImageHeight / 2);
data.imageHeight = data.targetImageHeight;
data.imageWidth = data.targetImageWidth;
if (transformSupported) {
var scaleX = data.imageWidth / data.naturalWidth,
scaleY = data.imageHeight / data.naturalHeight;
data.$positioner.css( _prefix("transform", "translate3d("+data.positionerLeft+"px, "+data.positionerTop+"px, 0)") );
data.$holder.css( _prefix("transform", "translate3d(-50%, -50%, 0) scale("+scaleX+","+scaleY+")") );
} else {
data.$positioner.css({
left: data.positionerLeft,
top: data.positionerTop
});
data.$holder.css({
left: data.imageLeft,
top: data.imageTop,
height: data.imageHeight,
width: data.imageWidth
});
}
data.$holder.append(data.$image);
if (data.tiled) {
data.$holder.css({
background: "url(" + data.tiledThumbnail + ") no-repeat left top",
backgroundSize: "100% 100%"
});
data.tileHeightPercentage = 100 / data.tiledRows;
data.tileWidthPercentage = 100 / data.tiledColumns;
data.$tiles.css({
height: data.tileHeightPercentage + "%",
width: data.tileWidthPercentage + "%"
});
data.$tiles.each(function(i, tile) {
var $tile = $(tile),
position = $tile.data("zoomer-tile").split("-");
$tile.css({
left: (data.tileWidthPercentage * parseInt(position[1], 10)) + "%",
top: (data.tileHeightPercentage * parseInt(position[0], 10)) + "%"
});
});
}
data.$holder.animate({ opacity: 1 }, 300);
data.loading = false;
// Start preloading
if (data.gallery) {
_preloadGallery(data);
}
}
/**
* @method private
* @name _preloadGallery
* @description Preloads previous and next images in gallery for faster rendering
* @param data [object] "Instance Data"
*/
function _preloadGallery(data) {
if (data.index > 0) {
$('<img src="' + data.images[data.index - 1] + '">');
}
if (data.index < data.images.length - 1) {
$('<img src="' + data.images[data.index + 1] + '">');
}
}
/**
* @method private
* @name _setMinimums
* @description Sets minimum dimensions
* @param data [object] "Instance Data"
*/
function _setMinimums(data) {
if (data.naturalHeight > data.naturalWidth) {
// Tall
data.aspect = "tall";
data.minHeight = Math.round(data.frameHeight - data.marginReal);
data.minWidth = Math.round(data.minHeight / data.imageRatioTall);
if (data.minWidth > (data.frameWidth - data.marginReal)) {
data.minWidth = Math.round(data.frameWidth - data.marginReal);
data.minHeight = Math.round(data.minWidth / data.imageRatioWide);
}
} else {
// Wide
data.aspect = "wide";
data.minWidth = Math.round(data.frameWidth - data.marginReal);
data.minHeight = Math.round(data.minWidth / data.imageRatioWide);
if (data.minHeight > (data.frameHeight - data.marginReal)) {
data.minHeight = Math.round(data.frameHeight - data.marginReal);
data.minWidth = Math.round(data.minHeight / data.imageRatioTall);
}
}
return data;
}
/**
* @method private
* @name _render
* @description Main animation loop
*/
function _render() {
for (var i = 0, count = $instances.length; i < count; i++) {
var data = $instances.eq(i).data("zoomer");
if (typeof data === "object") {
// Update image and position values
data = _updateValues(data);
data.lastAction = data.action;
// Update DOM
if (transformSupported) {
var scaleX = data.imageWidth / data.naturalWidth,
scaleY = data.imageHeight / data.naturalHeight;
data.$positioner.css(_prefix("transform", "translate3d(" + data.positionerLeft + "px, " + data.positionerTop + "px, 0)"));
data.$holder.css(_prefix("transform", "translate3d(-50%, -50%, 0) scale(" + scaleX + "," + scaleY + ")"));
} else {
data.$positioner.css({
left: data.positionerLeft,
top: data.positionerTop
});
data.$holder.css({
left: data.imageLeft,
top: data.imageTop,
width: data.imageWidth,
height: data.imageHeight
});
}
// Run callback function
if (data.callback) {
data.callback.apply(data.$zoomer, [
(data.imageWidth - data.minWidth) / (data.maxWidth - data.minWidth)
]);
}
}
}
}
/**
* @method private
* @name _updateValues
* @description Updates current image values
* @param data [object] "Instance Data"
*/
function _updateValues(data) {
// Update values based on current action
if (data.action === "zoom_in" || data.action === "zoom_out") {
// Calculate change
data.keyDownTime += data.increment;
var delta = ((data.action === "zoom_out") ? -1 : 1) * Math.round((data.imageWidth * data.keyDownTime) - data.imageWidth);
if (data.aspect === "tall") {
data.targetImageHeight += delta;
data.targetImageWidth = Math.round(data.targetImageHeight / data.imageRatioTall);
} else {
data.targetImageWidth += delta;
data.targetImageHeight = Math.round(data.targetImageWidth / data.imageRatioWide);
}
}
// Check Max and Min image values; recenter if too small
if (data.aspect === "tall") {
if (data.targetImageHeight < data.minHeight) {
data.targetImageHeight = data.minHeight;
data.targetImageWidth = Math.round(data.targetImageHeight / data.imageRatioTall);
} else if (data.targetImageHeight > data.maxHeight) {
data.targetImageHeight = data.maxHeight;
data.targetImageWidth = Math.round(data.targetImageHeight / data.imageRatioTall);
}
} else {
if (data.targetImageWidth < data.minWidth) {
data.targetImageWidth = data.minWidth;
data.targetImageHeight = Math.round(data.targetImageWidth / data.imageRatioWide);
} else if (data.targetImageWidth > data.maxWidth) {
data.targetImageWidth = data.maxWidth;
data.targetImageHeight = Math.round(data.targetImageWidth / data.imageRatioWide);
}
}
// Calculate new dimensions
data.targetImageLeft = Math.round(-data.targetImageWidth * 0.5);
data.targetImageTop = Math.round(-data.targetImageHeight * 0.5);
if (data.action === "drag" || data.action === "pinch") {
data.imageWidth = data.targetImageWidth;
data.imageHeight = data.targetImageHeight;
data.imageLeft = data.targetImageLeft;
data.imageTop = data.targetImageTop;
} else {
data.imageWidth += Math.round((data.targetImageWidth - data.imageWidth) * data.enertia);
data.imageHeight += Math.round((data.targetImageHeight - data.imageHeight) * data.enertia);
data.imageLeft += Math.round((data.targetImageLeft - data.imageLeft) * data.enertia);
data.imageTop += Math.round((data.targetImageTop - data.imageTop) * data.enertia);
}
// Check bounds of current position and if big enough to drag
// Set bounds
data.boundsLeft = Math.round(data.frameWidth - (data.targetImageWidth * 0.5) - data.marginMax);
data.boundsRight = Math.round((data.targetImageWidth * 0.5) + data.marginMax);
data.boundsTop = Math.round(data.frameHeight - (data.targetImageHeight * 0.5) - data.marginMax);
data.boundsBottom = Math.round((data.targetImageHeight * 0.5) + data.marginMax);
// Check dragging bounds
if (data.targetPositionerLeft < data.boundsLeft) {
data.targetPositionerLeft = data.boundsLeft;
}
if (data.targetPositionerLeft > data.boundsRight) {
data.targetPositionerLeft = data.boundsRight;
}
if (data.targetPositionerTop < data.boundsTop) {
data.targetPositionerTop = data.boundsTop;
}
if (data.targetPositionerTop > data.boundsBottom) {
data.targetPositionerTop = data.boundsBottom;
}
// Zoom to visible area of image
if (data.zoomPositionTop > 0 && data.zoomPositionLeft > 0) {
data.targetPositionerLeft = data.centerLeft - data.targetImageLeft - (data.targetImageWidth * data.zoomPositionLeft);
data.targetPositionerTop = data.centerTop - data.targetImageTop - (data.targetImageHeight * data.zoomPositionTop);
}
if (data.action !== "pinch") {
// Recenter when small enough
if (data.targetImageWidth < data.frameWidth) {
data.targetPositionerLeft = data.centerLeft;
}
if (data.targetImageHeight < data.frameHeight) {
data.targetPositionerTop = data.centerTop;
}
}
// Calculate new positions
if (data.action === "drag" || data.action === "pinch") {
data.positionerLeft = data.targetPositionerLeft;
data.positionerTop = data.targetPositionerTop;
} else {
data.positionerLeft += Math.round((data.targetPositionerLeft - data.positionerLeft) * data.enertia);
data.positionerTop += Math.round((data.targetPositionerTop - data.positionerTop) * data.enertia);
}
data.oldImageWidth = data.imageWidth;
data.oldImageHeight = data.imageHeight;
return data;
}
/**
* @method private
* @name _nextImage
* @description Handles next button click
* @param e [object] "Event Data"
*/
function _nextImage(e) {
var data = e.data;
if (!data.loading && data.index+1 < data.images.length) {
data.index++;
_load.apply(data.$target, [ data ]);
}
}
/**
* @method private
* @name _previousImage
* @description Handles previous button click
* @param e [object] "Event Data"
*/
function _previousImage(e) {
var data = e.data;
if (!data.loading && data.index-1 >= 0) {
data.index--;
_load.apply(data.$target, [ data ]);
}
}
/**
* @method private
* @name _zoomIn
* @description Handles zoom in button click
* @param e [object] "Event Data"
*/
function _zoomIn(e) {
e.preventDefault();
e.stopPropagation();
var data = e.data;
data = _setZoomPosition(data);
data.keyDownTime = 1;
data.action = "zoom_in";
}
/**
* @method private
* @name _zoomOut
* @description Handles zoom out button click
* @param e [object] "Event Data"
*/
function _zoomOut(e) {
e.preventDefault();
e.stopPropagation();
var data = e.data;
data = _setZoomPosition(data);
data.keyDownTime = 1;
data.action = "zoom_out";
}
/**
* @method private
* @name _clearZoom
* @description Clears current zoom action
* @param e [object] "Event Data"
*/
function _clearZoom(e) {
e.preventDefault();
e.stopPropagation();
var data = e.data;
data = _clearZoomPosition(data);
data.keyDownTime = 0;
data.action = "";
}
/**
* @method private
* @name _setZoomPosition
* @description Sets zoom position
* @param data [object] "Instance Data"
* @param left [number] "Left position"
* @param top [number] "Top position"
*/
function _setZoomPosition(data, left, top) {
left = left || (data.imageWidth * 0.5);
top = top || (data.imageHeight * 0.5);
data.zoomPositionLeft = ((left - (data.positionerLeft - data.centerLeft)) / data.imageWidth);
data.zoomPositionTop = ((top - (data.positionerTop - data.centerTop)) / data.imageHeight);
return data;
}
/**
* @method private
* @name _clearZoomPosition
* @description Clears zoom position
* @param data [object] "Instance Data"
*/
function _clearZoomPosition(data) {
data.zoomPositionTop = 0;
data.zoomPositionLeft = 0;
return data;
}
/**
* @method private
* @name _dragStart
* @description Handles drag start
* @param e [object] "Event Data"
*/
function _dragStart(e) {
if (e.preventDefault) {
e.preventDefault();
e.stopPropagation();
}
var data = e.data;
data.action = "drag";
data.mouseX = e.pageX;
data.mouseY = e.pageY;
data.targetPositionerLeft = data.positionerLeft;
data.targetPositionerTop = data.positionerTop;
$window.on("mousemove.zoomer", data, _onDrag)
.on("mouseup.zoomer", data, _dragStop);
}
/**
* @method private
* @name _onDrag
* @description Handles dragging
* @param e [object] "Event Data"
*/
function _onDrag(e) {
if (e.preventDefault) {
e.preventDefault();
e.stopPropagation();
}
var data = e.data;
if (e.pageX && e.pageY) {
data.targetPositionerLeft -= Math.round(data.mouseX - e.pageX);
data.targetPositionerTop -= Math.round(data.mouseY - e.pageY);
data.mouseX = e.pageX;
data.mouseY = e.pageY;
}
}
/**
* @method private
* @name _dragStop
* @description Handles drag end
* @param e [object] "Event Data"
*/
function _dragStop(e) {
if (e.preventDefault) {
e.preventDefault();
e.stopPropagation();
}
var data = e.data;
data.action = "";
$window.off("mousemove.zoomer mouseup.zoomer");
}
/**
* @method private
* @name _onTouch
* @description Delegates touch event
* @param e [object] "Event Data"
*/
function _onTouch(e) {
if ($(e.target).parent(".zoomer-controls").length > 0) {
return;
}
// Stop ms panning and zooming
if (e.preventManipulation) {
e.preventManipulation();
}
e.preventDefault();
e.stopPropagation();
var data = e.data,
oe = e.originalEvent;
if (oe.type.match(/(up|end)$/i)) {
_onTouchEnd(data, oe);
return;