A firefox addon that adds a horizontal translucent bar that follows the cursor. A reading aid for pages with wiiiiiiide paragraphs.
目前为
// ==UserScript==
// @name Reading Ruler
// @namespace https://old.reddit.com/r/SomebodyMakeThis/comments/9huwbw/smt_a_firefox_addon_that_adds_a_horizontal/
// @version 0.1
// @description A firefox addon that adds a horizontal translucent bar that follows the cursor. A reading aid for pages with wiiiiiiide paragraphs.
// @author /r/defproc
// @match */*
// @grant none
// ==/UserScript==
(function() {
'use strict';
var bar = document.createElement("div");
var styles = {
left: 0,
right: 0,
height: "1.25em",
backgroundColor: "#00ff0012",
position: "absolute",
transform: "translateY(-50%)",
display: "none",
pointerEvents: "none",
transition: "120ms height"
};
Object.keys(styles).forEach(function(k){ bar.style[k] = styles[k] });
document.body.addEventListener("mousemove", function(ev){
bar.style.top = ev.clientY + "px";
if(visible){
var over = document.elementFromPoint(ev.clientX, ev.clientY);
bar.style.height = window.getComputedStyle(over).getPropertyValue("line-height");
}
});
var visible = false;
var toggle = function(){
visible = !visible;
document.body.appendChild(bar);
bar.style.display = visible ? "block" : "none";
};
window.addEventListener("keypress", function(ev){
if(ev.ctrlKey && ev.altKey) toggle();
});
})();