// ==UserScript==
// @name               f-droid.org  -  Enlarge Screenshots
// @namespace          a-pav
// @description        Enlarge (and then reduce) app's screenshots by single click. Browse (i.e. next/previous) screenshots by using arrow keys, both in enlarged mode and in the normal mode.
// @match              *://f-droid.org/packages/*
// @match              *://f-droid.org/*/packages/*
// @version            1.0
// @run-at             document-end
// @author             a-pav
// @grant              none
// @icon               https://f-droid.org/assets/favicon-32x32.png
// ==/UserScript==
const bigScreenShotID = "enlarged-scrnsht";
var screenshotsFrame = document.querySelector("#screenshots>div.frame.js_frame");
if (!screenshotsFrame) {
// no screenshots for this package
return
}
var gallery = screenshotsFrame.querySelector("ul.gallery");
var screenshotsList = screenshotsFrame.querySelectorAll("li.js_slide.screenshot");
function showSCREENSHOT(index) {
gallery.style.display = "none";
var li = screenshotsList[index];
var img = li.querySelector("img").cloneNode();
img.setAttribute("id", bigScreenShotID);
img.setAttribute("arrindex", index);
img.addEventListener('click', function() {
removeSCREENSHOT(this);
});
screenshotsFrame.append(img);
img.scrollIntoView({behavior: "smooth"});
}
function removeSCREENSHOT(img, scroll = true) {
gallery.style.display = "block";
if (!img) {
img = document.getElementById(bigScreenShotID);
}
if (img) {
img.parentElement.removeChild(img);
}
if (scroll) {
screenshotsFrame.scrollIntoView({behavior: "smooth"});
}
}
screenshotsList.forEach(function(elm , index) {
elm.addEventListener('click', function() {
showSCREENSHOT(index);
});
});
document.querySelectorAll("div#screenshots>span.slider_nav").forEach(function(elm) {
elm.addEventListener('click', function() {
var img = document.getElementById(bigScreenShotID);
if (img === null) {
// do nothing
return;
}
var next = this.classList.contains('next');
var index = parseInt(img.getAttribute("arrindex"));
if (next) {
index += 1;
if (index > screenshotsList.length - 1) {
index = 0;
}
} else {
index -= 1;
if (index < 0) {
index = screenshotsList.length - 1;
}
}
removeSCREENSHOT(img); // remove previously enlarged image
showSCREENSHOT(index);
});
});
// Keybindings
var next = document.querySelector("div#screenshots>span.slider_nav.next");
var prev = document.querySelector("div#screenshots>span.slider_nav.prev");
var clickEvent = new Event('click');
window.addEventListener('keyup', function(e) {
if (e.key === "ArrowRight") { // or e.which 39
next.dispatchEvent(clickEvent);
} else if (e.key === "ArrowLeft") { // or e.which 37
prev.dispatchEvent(clickEvent);
} else if (e.key === "Escape") { // or e.which: 27
removeSCREENSHOT(null, false);
}
});