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/**
* @license MIT
* topbar 2.0.0, 2023-02-04
* https://buunguyen.github.io/topbar
* Copyright (c) 2021 Buu Nguyen
*/
(function (window, document) {
"use strict";
// https://gist.github.com/paulirish/1579671
(function () {
var lastTime = 0;
var vendors = ["ms", "moz", "webkit", "o"];
for (var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
window.requestAnimationFrame =
window[vendors[x] + "RequestAnimationFrame"];
window.cancelAnimationFrame =
window[vendors[x] + "CancelAnimationFrame"] ||
window[vendors[x] + "CancelRequestAnimationFrame"];
}
if (!window.requestAnimationFrame)
window.requestAnimationFrame = function (callback, element) {
var currTime = new Date().getTime();
var timeToCall = Math.max(0, 16 - (currTime - lastTime));
var id = window.setTimeout(function () {
callback(currTime + timeToCall);
}, timeToCall);
lastTime = currTime + timeToCall;
return id;
};
if (!window.cancelAnimationFrame)
window.cancelAnimationFrame = function (id) {
clearTimeout(id);
};
})();
var canvas,
currentProgress,
showing,
progressTimerId = null,
fadeTimerId = null,
delayTimerId = null,
addEvent = function (elem, type, handler) {
if (elem.addEventListener) elem.addEventListener(type, handler, false);
else if (elem.attachEvent) elem.attachEvent("on" + type, handler);
else elem["on" + type] = handler;
},
options = {
autoRun: true,
barThickness: 3,
barColors: {
0: "rgba(26, 188, 156, .9)",
".25": "rgba(52, 152, 219, .9)",
".50": "rgba(241, 196, 15, .9)",
".75": "rgba(230, 126, 34, .9)",
"1.0": "rgba(211, 84, 0, .9)",
},
shadowBlur: 10,
shadowColor: "rgba(0, 0, 0, .6)",
className: null,
},
repaint = function () {
canvas.width = window.innerWidth;
canvas.height = options.barThickness * 5; // need space for shadow
var ctx = canvas.getContext("2d");
ctx.shadowBlur = options.shadowBlur;
ctx.shadowColor = options.shadowColor;
var lineGradient = ctx.createLinearGradient(0, 0, canvas.width, 0);
for (var stop in options.barColors)
lineGradient.addColorStop(stop, options.barColors[stop]);
ctx.lineWidth = options.barThickness;
ctx.beginPath();
ctx.moveTo(0, options.barThickness / 2);
ctx.lineTo(
Math.ceil(currentProgress * canvas.width),
options.barThickness / 2
);
ctx.strokeStyle = lineGradient;
ctx.stroke();
},
createCanvas = function () {
canvas = document.createElement("canvas");
var style = canvas.style;
style.position = "fixed";
style.top = style.left = style.right = style.margin = style.padding = 0;
style.zIndex = 100001;
style.display = "none";
if (options.className) canvas.classList.add(options.className);
document.body.appendChild(canvas);
addEvent(window, "resize", repaint);
},
topbar = {
config: function (opts) {
for (var key in opts)
if (options.hasOwnProperty(key)) options[key] = opts[key];
},
show: function (delay) {
if (showing) return;
if (delay) {
if (delayTimerId) return;
delayTimerId = setTimeout(() => topbar.show(), delay);
} else {
showing = true;
if (fadeTimerId !== null) window.cancelAnimationFrame(fadeTimerId);
if (!canvas) createCanvas();
canvas.style.opacity = 1;
canvas.style.display = "block";
topbar.progress(0);
if (options.autoRun) {
(function loop() {
progressTimerId = window.requestAnimationFrame(loop);
topbar.progress(
"+" + 0.05 * Math.pow(1 - Math.sqrt(currentProgress), 2)
);
})();
}
}
},
progress: function (to) {
if (typeof to === "undefined") return currentProgress;
if (typeof to === "string") {
to =
(to.indexOf("+") >= 0 || to.indexOf("-") >= 0
? currentProgress
: 0) + parseFloat(to);
}
currentProgress = to > 1 ? 1 : to;
repaint();
return currentProgress;
},
hide: function () {
clearTimeout(delayTimerId);
delayTimerId = null;
if (!showing) return;
showing = false;
if (progressTimerId != null) {
window.cancelAnimationFrame(progressTimerId);
progressTimerId = null;
}
(function loop() {
if (topbar.progress("+.1") >= 1) {
canvas.style.opacity -= 0.05;
if (canvas.style.opacity <= 0.05) {
canvas.style.display = "none";
fadeTimerId = null;
return;
}
}
fadeTimerId = window.requestAnimationFrame(loop);
})();
},
};
if (typeof module === "object" && typeof module.exports === "object") {
module.exports = topbar;
} else if (typeof define === "function" && define.amd) {
define(function () {
return topbar;
});
} else {
this.topbar = topbar;
}
}.call(this, window, document));
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