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Added option for the compare to follow the mouse as it moves #40

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Added option for the compare to follow the mouse as it moves #40

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60 changes: 42 additions & 18 deletions js/jquery.twentytwenty.js
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Original file line number Diff line number Diff line change
@@ -1,16 +1,15 @@
(function($){

$.fn.twentytwenty = function(options) {
var options = $.extend({default_offset_pct: 0.5, orientation: 'horizontal'}, options);
var options = $.extend({default_offset_pct: 0.5, orientation: 'horizontal', follow_mouse: false}, options);
return this.each(function() {

var sliderPct = options.default_offset_pct;
var container = $(this);
var sliderOrientation = options.orientation;
var beforeDirection = (sliderOrientation === 'vertical') ? 'down' : 'left';
var afterDirection = (sliderOrientation === 'vertical') ? 'up' : 'right';



container.wrap("<div class='twentytwenty-wrapper twentytwenty-" + sliderOrientation + "'></div>");
container.append("<div class='twentytwenty-overlay'></div>");
var beforeImg = container.find("img:first");
Expand All @@ -22,7 +21,7 @@
container.addClass("twentytwenty-container");
beforeImg.addClass("twentytwenty-before");
afterImg.addClass("twentytwenty-after");

var overlay = container.find(".twentytwenty-overlay");
overlay.append("<div class='twentytwenty-before-label'></div>");
overlay.append("<div class='twentytwenty-after-label'></div>");
Expand Down Expand Up @@ -52,15 +51,28 @@
var offset = calcOffset(pct);
slider.css((sliderOrientation==="vertical") ? "top" : "left", (sliderOrientation==="vertical") ? offset.ch : offset.cw);
adjustContainer(offset);
}
};

var performMove = function(e) {
if (container.hasClass("active")) {
sliderPct = (sliderOrientation === 'vertical') ? (e.pageY-offsetY)/imgHeight : (e.pageX-offsetX)/imgWidth;
if (sliderPct < 0) {
sliderPct = 0;
}
if (sliderPct > 1) {
sliderPct = 1;
}
adjustSlider(sliderPct);
}
};

$(window).on("resize.twentytwenty", function(e) {
adjustSlider(sliderPct);
});

var offsetX = 0;
var imgWidth = 0;

slider.on("movestart", function(e) {
if (((e.distX > e.distY && e.distX < -e.distY) || (e.distX < e.distY && e.distX > -e.distY)) && sliderOrientation !== 'vertical') {
e.preventDefault();
Expand All @@ -71,31 +83,43 @@
container.addClass("active");
offsetX = container.offset().left;
offsetY = container.offset().top;
imgWidth = beforeImg.width();
imgHeight = beforeImg.height();
imgWidth = beforeImg.width();
imgHeight = beforeImg.height();
});

slider.on("moveend", function(e) {
container.removeClass("active");
});

slider.on("move", function(e) {
if (container.hasClass("active")) {
sliderPct = (sliderOrientation === 'vertical') ? (e.pageY-offsetY)/imgHeight : (e.pageX-offsetX)/imgWidth;
if (sliderPct < 0) {
sliderPct = 0;
}
if (sliderPct > 1) {
sliderPct = 1;
}
adjustSlider(sliderPct);
}
performMove(e);
});

container.find("img").on("mousedown", function(event) {
event.preventDefault();
});

if (options.follow_mouse) {
overlay.children().css('opacity', '1');

container.on("mousemove touchmove", function(e) {
overlay.children().css('opacity', '0');

container.addClass("active");
offsetX = container.offset().left;
offsetY = container.offset().top;
imgWidth = beforeImg.width();
imgHeight = beforeImg.height();

performMove(e);
});

container.on("mouseleave touchend", function(e) {
container.removeClass("active");
overlay.children().css('opacity', '1');
});
}

$(window).trigger("resize.twentytwenty");
});
};
Expand Down