Keyboard based navigation
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// ==UserScript==
// @name Keyboard navigation
// @version 1.8.7
// @author Sly_North
// @description Keyboard based navigation
// @grant none
// @run-at document-start
// @namespace Sly_North
// @include *
// @license MIT
// ==/UserScript==
// Click first link (tag='a' or 'span') with text matching one of 'keywords' regex
function ClickLink(tag, keywords) {
var elts = document.getElementsByTagName(tag);
for (var i = 0; i < elts.length; ++i) {
var elt = elts[i];
for (k in keywords)
{
var regexp = keywords[k];
if (elt.textContent.match(keywords[k])) {
console.log('Clicking ', elt.textContent);
elt.click();
return true;
}
}
}
return false;
}
// Make 'link' visibly selected.
var lastSel; // previous selected link
function SelectLink(link, links) {
if (lastSel) lastSel.style.backgroundColor = "";
lastSel = link;
link.focus();
link.style.backgroundColor = "orange";
}
// Select either link with preferred text or closer to the center.
function SelectBestLink() {
var links = document.getElementsByTagName('a');
var curr = document.activeElement;
var viewport = window.visualViewport;
var screenHeight = viewport.height;
var midX = viewport.width/2;
var midY = screenHeight/2;
var minD = 1000000000;
var best;
var keywords = [/cliquez sur ce lien/i, /#unread/, /Discussions/];
for (var i = 0; i < links.length; ++i) {
var link = links[i];
var br = link.getBoundingClientRect();
var d = Math.abs(br.left - midX) + Math.abs(br.top - midY);
if ((link == curr)) continue;
// Insert here other preferred link texts.
for (var k in keywords) {
if (link.text.match(keywords[k])) {
// link.click();
SelectLink(link, links);
return;
}
}
// Select link to current page, if not already selected
if (link.href == document.URL) {
if ((br.top >= 0) && (br.top < screenHeight)) {
// If on start, focus it, without highlighting it.
SelectLink(link, links);
return;
}
}
// Select link closer to the center
if (d < minD) {
minD = d;
best = link;
}
}
if (best) {
// If on start, focus it, without highlighting it.
console.log("Select link", best.text);
SelectLink(best, links);
}
}
// Skip most simple cookie forms.
function SkipCookieWall() {
var elts = document.getElementsByTagName('span');
for (i in elts) {
var t = elts[i].innerText;
if (!t) continue;
if (t.match(/Continuer sans accepter/) || t.match(/CONTINUER SANS ACCEPTER/) || t.match(/Continue without agree/) || t.match(/Only allow essential cookies/)) {
console.log("Clic ", t);
elts[i].click();
return;
}
}
}
// Unblock the page scrolling.
function Unfreeze() {
document.body.classList.remove('content-blurred');
document.body.classList.remove('noscroll');
document.documentElement.style.overflow = "scroll";
document.body.style.overflow = "scroll";
console.log('Unfreeze overflow');
}
// Listen for a few control+alt + key
document.addEventListener('keydown', function(e) {
// console.log('ctrl=',e.ctrlKey,' alt=',e.altKey, ' meta=', e.metaKey, ' key=',e.keyCode);
if (e.shiftKey || !e.ctrlKey || (!e.altKey && !e.metaKey)) return;
var dx = 0, dy = 0, scaleX = 1;
var maxDX = 10000000, maxDY = 10000000;
var scaleWidth = 0;
// Space=select best link, enter=click best link, #/del=GMail's delete old messages in trash, o/p=previous/next page
if (e.keyCode == 32 || e.keyCode == 220) { SelectBestLink(); return; }
else if (e.keyCode == 13 || e.keyCode == 90) { ClickLink('a', [/cliquez sur ce lien/, /click this link/, /unread#unread/]); return; }
else if (e.keyCode == 46 || e.keyCode == 51) { ClickLink('span', [/^delete forever/]); return; }
else if (e.keyCode == 79 || e.keyCode == 219) {
if (!ClickLink('a', [/Précédent/i, /Prev/, /Previous page/, /Older/]))
ClickLink('i', [/ chevron_left /]);
return;
}
else if (e.keyCode == 80 || e.keyCode == 221) {
if (!ClickLink('a', [/Suivant/i, /Next/, /Next page/, /Newer/])) {
ClickLink('i', [/ chevron_right /]);
}
return;
}
else if (e.keyCode == 85) { Unfreeze(); return; }
else if (e.keyCode == 67) { SkipCookieWall(); return; }
// Select direction in which to look for 'best' link
else if (e.keyCode == 37 || e.keyCode == 72) { dx = -1; scaleWidth = 1; maxDY = 50; } // left
else if (e.keyCode == 39 || e.keyCode == 76) { dx = +1; scaleWidth = 1; maxDY = 50; } // right
else if (e.keyCode == 38 || e.keyCode == 75) { dy = -1; scaleX = 0.5; } // up
else if (e.keyCode == 40 || e.keyCode == 74) { dy = +1; scaleX = 0.5; } // down
else {
// console.log('Key ignored:', e.keyCode);
return;
}
// Look for next link in a given direction
var adx = Math.abs(dx), ady = Math.abs(dy);
var curr = document.activeElement;
var br = curr.getBoundingClientRect();
var sx = br.left + br.width*scaleWidth; // + br.width/2;
var sy = br.top + br.height/2;
var links = document.getElementsByTagName('a');
var best;
var minD = 1500;
// console.log('Arrow in dir x =',dx,' y =',dy);
for (var i = 0; i < links.length; ++i) {
var link = links[i];
if (link != curr) {
var br2 = link.getBoundingClientRect();
var x = (br2.left + br2.width*scaleWidth /*+ br2.width/2*/ - sx) * scaleX;
var y = br2.top + br2.height/2 - sy;
var ax = Math.abs(x), ay = Math.abs(y);
var distX = x*dx, distY = y*dy;
if (ax <= maxDX && ay <= maxDY && distX >= adx && distY >= ady) {
// console.log(Math.abs(x*dx + y*dy) , " vs ", Math.abs(x*dy + y*dx));
var d = ax + ay;
if (Math.abs(x*dx + y*dy) < Math.abs(x*dy + y*dx))
d *= 2; // Penalize off-direction links
if (d < minD) {
if ((dx != 0 || ax/(1+ay) < 3) && (dy != 0 || ay < 100)) {
// console.log(" new best link x = ",x," y = ", y, ' distX=',distX,' distY=', distY, " minD = ", minD, " ", link.text);
minD = d;
best = link;
}
}
}
}
}
if (best) SelectLink(best, links);
}, false);
setTimeout(() => {SkipCookieWall();}, 1000);
// setTimeout(() => {SkipCookieWall();}, 1500);
console.log('key navigation handler ready');