Powerfap

Adds full screen lightbox feature (with preloading) for imagefap galleries. Just click on image thumbnail from the category or homepage.
Per 10-05-2019. Zie de nieuwste versie.
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// ==UserScript==
// @name         Powerfap
// @namespace    http://tampermonkey.net/
// @version      0.3
// @description  Adds full screen lightbox feature (with preloading) for imagefap galleries. Just click on image thumbnail from the category or homepage. 
// @author       Alekc
// @match        https://www.imagefap.com/*
// @require      https://cdn.jsdelivr.net/npm/[email protected]/src/simpleLightbox.min.js
// @grant        none
// ==/UserScript==

const css_lightbox = `
.slbOverlay, .slbWrapOuter, .slbWrap {
position: fixed;
top: 0;
right: 0;
bottom: 0;
left: 0;
}

.slbOverlay {
overflow: hidden;
z-index: 2000;
background-color: #000;
opacity: 0.7;
-webkit-animation: slbOverlay 0.5s;
-moz-animation: slbOverlay 0.5s;
animation: slbOverlay 0.5s;
}

.slbWrapOuter {
overflow-x: hidden;
overflow-y: auto;
z-index: 2010;
}

.slbWrap {
position: absolute;
text-align: center;
}

.slbWrap:before {
content: "";
display: inline-block;
height: 100%;
vertical-align: middle;
}

.slbContentOuter {
position: relative;
display: inline-block;
vertical-align: middle;
margin: 0px auto;
padding: 0 1em;
box-sizing: border-box;
z-index: 2020;
text-align: left;
max-width: 100%;
}

.slbContentEl .slbContentOuter {
padding: 5em 1em;
}

.slbContent {
position: relative;
}

.slbContentEl .slbContent {
-webkit-animation: slbEnter 0.3s;
-moz-animation: slbEnter 0.3s;
animation: slbEnter 0.3s;
background-color: #fff;
box-shadow: 0 0.2em 1em rgba(0, 0, 0, 0.4);
}

.slbImageWrap {
-webkit-animation: slbEnter 0.3s;
-moz-animation: slbEnter 0.3s;
animation: slbEnter 0.3s;
position: relative;
}

.slbImageWrap:after {
content: "";
position: absolute;
left: 0;
right: 0;
top: 5em;
bottom: 5em;
display: block;
z-index: -1;
box-shadow: 0 0.2em 1em rgba(0, 0, 0, 0.6);
background-color: #FFF;
}

.slbDirectionNext .slbImageWrap {
-webkit-animation: slbEnterNext 0.4s;
-moz-animation: slbEnterNext 0.4s;
animation: slbEnterNext 0.4s;
}

.slbDirectionPrev .slbImageWrap {
-webkit-animation: slbEnterPrev 0.4s;
-moz-animation: slbEnterPrev 0.4s;
animation: slbEnterPrev 0.4s;
}

.slbImage {
width: auto;
max-width: 100%;
height: auto;
display: block;
line-height: 0;
box-sizing: border-box;
padding: 5em 0;
margin: 0 auto;
}

.slbCaption {
display: inline-block;
max-width: 100%;
overflow: hidden;
text-overflow: ellipsis;
white-space: nowrap;
word-wrap: normal;
font-size: 1.4em;
position: absolute;
left: 0;
right: 0;
bottom: 0;
padding: 0.71429em 0;
color: #fff;
color: rgba(255, 255, 255, 0.7);
text-align: center;
}

.slbCloseBtn, .slbArrow {
margin: 0;
padding: 0;
border: 0;
cursor: pointer;
background: none;
}

.slbCloseBtn::-moz-focus-inner, .slbArrow::-moz-focus-inner {
padding: 0;
border: 0;
}

.slbCloseBtn:hover, .slbArrow:hover {
opacity: 0.5;
}

.slbCloseBtn:active, .slbArrow:active {
opacity: 0.8;
}

.slbCloseBtn {
-webkit-animation: slbEnter 0.3s;
-moz-animation: slbEnter 0.3s;
animation: slbEnter 0.3s;
font-size: 3em;
width: 1.66667em;
height: 1.66667em;
line-height: 1.66667em;
position: absolute;
right: -0.33333em;
top: 0;
color: #fff;
color: rgba(255, 255, 255, 0.7);
text-align: center;
}

.slbLoading .slbCloseBtn {
display: none;
}

.slbLoadingText {
font-size: 1.4em;
color: #fff;
color: rgba(255, 255, 255, 0.9);
}

.slbArrows {
position: fixed;
top: 50%;
left: 0;
right: 0;
}

.slbLoading .slbArrows {
display: none;
}

.slbArrow {
position: absolute;
top: 50%;
margin-top: -5em;
width: 5em;
height: 10em;
opacity: 0.7;
text-indent: -999em;
overflow: hidden;
}

.slbArrow:before {
content: "";
position: absolute;
top: 50%;
left: 50%;
margin: -0.8em 0 0 -0.8em;
border: 0.8em solid transparent;
}

.slbArrow.next {
right: 0;
}

.slbArrow.next:before {
border-left-color: #fff;
}

.slbArrow.prev {
left: 0;
}

.slbArrow.prev:before {
border-right-color: #fff;
}

.slbIframeCont {
width: 80em;
height: 0;
overflow: hidden;
padding-top: 56.25%;
margin: 5em 0;
}

.slbIframe {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
box-shadow: 0 0.2em 1em rgba(0, 0, 0, 0.6);
background: #000;
}

@-webkit-keyframes slbOverlay {
from {
opacity: 0;
}
to {
opacity: 0.7;
}
}

@-moz-keyframes slbOverlay {
from {
opacity: 0;
}
to {
opacity: 0.7;
}
}

@keyframes slbOverlay {
from {
opacity: 0;
}
to {
opacity: 0.7;
}
}

@-webkit-keyframes slbEnter {
from {
opacity: 0;
-webkit-transform: translate3d(0, -1em, 0);
}
to {
opacity: 1;
-webkit-transform: translate3d(0, 0, 0);
}
}

@-moz-keyframes slbEnter {
from {
opacity: 0;
-moz-transform: translate3d(0, -1em, 0);
}
to {
opacity: 1;
-moz-transform: translate3d(0, 0, 0);
}
}

@keyframes slbEnter {
from {
opacity: 0;
-webkit-transform: translate3d(0, -1em, 0);
-moz-transform: translate3d(0, -1em, 0);
-ms-transform: translate3d(0, -1em, 0);
-o-transform: translate3d(0, -1em, 0);
transform: translate3d(0, -1em, 0);
}
to {
opacity: 1;
-webkit-transform: translate3d(0, 0, 0);
-moz-transform: translate3d(0, 0, 0);
-ms-transform: translate3d(0, 0, 0);
-o-transform: translate3d(0, 0, 0);
transform: translate3d(0, 0, 0);
}
}

@-webkit-keyframes slbEnterNext {
from {
opacity: 0;
-webkit-transform: translate3d(4em, 0, 0);
}
to {
opacity: 1;
-webkit-transform: translate3d(0, 0, 0);
}
}

@-moz-keyframes slbEnterNext {
from {
opacity: 0;
-moz-transform: translate3d(4em, 0, 0);
}
to {
opacity: 1;
-moz-transform: translate3d(0, 0, 0);
}
}

@keyframes slbEnterNext {
from {
opacity: 0;
-webkit-transform: translate3d(4em, 0, 0);
-moz-transform: translate3d(4em, 0, 0);
-ms-transform: translate3d(4em, 0, 0);
-o-transform: translate3d(4em, 0, 0);
transform: translate3d(4em, 0, 0);
}
to {
opacity: 1;
-webkit-transform: translate3d(0, 0, 0);
-moz-transform: translate3d(0, 0, 0);
-ms-transform: translate3d(0, 0, 0);
-o-transform: translate3d(0, 0, 0);
transform: translate3d(0, 0, 0);
}
}

@-webkit-keyframes slbEnterPrev {
from {
opacity: 0;
-webkit-transform: translate3d(-4em, 0, 0);
}
to {
opacity: 1;
-webkit-transform: translate3d(0, 0, 0);
}
}

@-moz-keyframes slbEnterPrev {
from {
opacity: 0;
-moz-transform: translate3d(-4em, 0, 0);
}
to {
opacity: 1;
-moz-transform: translate3d(0, 0, 0);
}
}

@keyframes slbEnterPrev {
from {
opacity: 0;
-webkit-transform: translate3d(-4em, 0, 0);
-moz-transform: translate3d(-4em, 0, 0);
-ms-transform: translate3d(-4em, 0, 0);
-o-transform: translate3d(-4em, 0, 0);
transform: translate3d(-4em, 0, 0);
}
to {
opacity: 1;
-webkit-transform: translate3d(0, 0, 0);
-moz-transform: translate3d(0, 0, 0);
-ms-transform: translate3d(0, 0, 0);
-o-transform: translate3d(0, 0, 0);
transform: translate3d(0, 0, 0);
}
}
.lds-ellipsis {
display: inline-block;
position: relative;
width: 64px;
height: 64px;
}
.lds-ellipsis div {
position: absolute;
top: 27px;
width: 11px;
height: 11px;
border-radius: 50%;
background: #fff;
animation-timing-function: cubic-bezier(0, 1, 1, 0);
}
.lds-ellipsis div:nth-child(1) {
left: 6px;
animation: lds-ellipsis1 0.6s infinite;
}
.lds-ellipsis div:nth-child(2) {
left: 6px;
animation: lds-ellipsis2 0.6s infinite;
}
.lds-ellipsis div:nth-child(3) {
left: 26px;
animation: lds-ellipsis2 0.6s infinite;
}
.lds-ellipsis div:nth-child(4) {
left: 45px;
animation: lds-ellipsis3 0.6s infinite;
}
@keyframes lds-ellipsis1 {
0% {
transform: scale(0);
}
100% {
transform: scale(1);
}
}
@keyframes lds-ellipsis3 {
0% {
transform: scale(1);
}
100% {
transform: scale(0);
}
}
@keyframes lds-ellipsis2 {
0% {
transform: translate(0, 0);
}
100% {
transform: translate(19px, 0);
}
}
#overlay {

display:none;
}
#overlay .lds-ellipsis {
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
}
`;

const loadingSplashScreenHtml = `<div id='overlay' class="slbOverlay"><div class="lds-ellipsis"><div></div><div></div><div></div><div></div></div></div>`
var $ = window.$;
const galRegex = /\/photo\/(\d+)/m;
const homeRegex = /image\.php\?id=(\d+)/m;

var preloadedImages = [];
var lightBox;
(function() {
    'use strict';

    //prepare lightBox
    $("body").append("<style>" + css_lightbox + "</style>" + loadingSplashScreenHtml);

    //link from category page
    $("img.gal_thumb").parent("a").click(function(){
        event.preventDefault();
        showOverlay();
        var match = galRegex.exec($(this).attr("href"));
        if (match == null){
            alert("can't find photo id");
            return;
        }


        var galId = $(this).closest("tr[valign='top']").prev().attr("id");
        var photoId = match[1];
        run(photoId, galId,[]);
    });

    $('a[href*="image.php?id="]').click(function(){
        event.preventDefault();
        showOverlay();
        var match = homeRegex.exec($(this).attr("href"));
        if (match == null){
            alert("can't find photo id");
            return;
        }

        var galId = $(this).closest("tr:not([bgcolor])").prev().attr("id");
        var photoId = match[1];
        run(photoId, galId,[]);
    });
    //
})();

function showOverlay(){
    $("#overlay").show();
}
function hideOverlay(){
    $("#overlay").hide();
}
function run(photoId, galId, result){
    var url = "https://www.imagefap.com/photo/"+ photoId +"/?gid=" + galId + "&idx=" + result.length + "&partial=true";
    $.ajax({
        url: url,
        type: "GET",
        dataType: "html",
        success: function(data) {
            var newLinks = [];
            $(data).find("a").each(function(){
                newLinks.push($(this).attr("href"));
            });
            result = result.concat(newLinks);
            if (newLinks.length == 0 || newLinks.length < 24) {
                //todo: generate library
                generateLightBox(result);
                return;
            }
            run(photoId, galId, result);
        },
        error: function(jqXHR, textStatus,errorThrown ){
            alert("Error: "+ textStatus + " (" + errorThrown + ")");
            hideOverlay();
        }
    });
}

function generateLightBox(result){
    lightBox = SimpleLightbox.open({
        items: result
    });

    //$(lightBox.$content).parent().find("button.next").click(preloadNextSlide);
    lightBox.next = function (event){
        this.showPosition(this.currentPosition + 1);
        var preloadCount = 5;
        if (this.currentPosition + preloadCount <= this.items.length){
            preloadImage(this.items[this.currentPosition + preloadCount]);
        }
    }
    //preload first x
    for (var i = 1; i<6;i++){
        preloadImage(result[i]);
    }
    hideOverlay();
    lightBox.show();
}
function preloadImage(href){
    if (href === 'undefined' || typeof(preloadedImages[href]) !== 'undefined'){
        return;
    }
    preloadedImages[href] = new Image();
    preloadedImages[href].src = href;
}