251 lines
7.7 KiB
JavaScript
251 lines
7.7 KiB
JavaScript
/*
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----------------------------------------------------
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Loader.js : 0.3 : 2012/04/12
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----------------------------------------------------
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https://github.com/mudcube/Loader.js
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----------------------------------------------------
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var loader = new widgets.Loader({ message: "loading: New loading message..." });
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----------------------------------------------------
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var loader = new widgets.Loader({
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id: "loader",
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bars: 12,
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radius: 0,
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lineWidth: 20,
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lineHeight: 70,
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background: "rgba(0,0,0,0.5)",
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message: "loading...",
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callback: function() {
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// call function once loader has started
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}
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});
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loader.stop();
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----------------------------------------------------
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loader.message("loading: New loading message...", function() {
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// call function once loader has started
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});
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*/
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if (typeof(widgets) === "undefined") var widgets = {};
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widgets.Loader = (function(root) { "use strict";
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var PI = Math.PI;
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var defaultConfig = {
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id: "loader",
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bars: 12,
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radius: 0,
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lineWidth: 20,
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lineHeight: 70,
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display: true
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};
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var getWindowSize = function() {
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if (window.innerWidth && window.innerHeight) {
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var width = window.innerWidth;
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var height = window.innerHeight;
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} else if (document.compatMode === 'CSS1Compat' && document.documentElement && document.documentElement.offsetWidth) {
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var width = document.documentElement.offsetWidth;
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var height = document.documentElement.offsetHeight;
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} else if (document.body && document.body.offsetWidth) {
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var width = document.body.offsetWidth;
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var height = document.body.offsetHeight;
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}
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return {
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width: width,
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height: height
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};
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};
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return function (conf) {
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var that = this;
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if (!document.createElement("canvas").getContext) return;
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var that = this;
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if (!document.body) return;
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if (typeof(conf) === "string") conf = { message: conf };
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if (typeof(conf) === "undefined") conf = {};
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if (typeof(conf) === "boolean") conf = { display: false };
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for (var key in defaultConfig) {
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if (typeof(conf[key]) === "undefined") {
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conf[key] = defaultConfig[key];
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}
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}
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//
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function centerSpan() {
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if (conf.message) {
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var windowSize = getWindowSize();
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var width = windowSize.width - size;
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var height = windowSize.height - size;
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that.span.style.left = ((width + size) / 2 - that.span.offsetWidth/2) + "px";
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that.span.style.top = (height / 2 + size - 10) + "px";
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}
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};
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///
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var canvas = document.getElementById(conf.id);
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var timeout = 1;
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if (!canvas) {
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var div = document.createElement("div");
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var span = document.createElement("span");
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div.appendChild(span);
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div.className = defaultConfig.id;
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that.span = span;
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that.div = div;
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var canvas = document.createElement("canvas");
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document.body.appendChild(canvas);
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canvas.id = conf.id;
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canvas.style.cssText = "opacity: 1; position: absolute; z-index: 10000;";
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div.appendChild(canvas);
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document.body.appendChild(div);
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} else {
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that.span = canvas.parentNode.getElementsByTagName("span")[0];
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}
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//
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var delay = conf.delay;
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var bars = conf.bars;
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var radius = conf.radius;
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var max = conf.lineHeight + 20;
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var size = max * 2 + conf.radius * 2;
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var windowSize = getWindowSize();
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var width = windowSize.width - size;
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var height = windowSize.height - size;
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///
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canvas.width = size;
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canvas.height = size;
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canvas.style.left = (width / 2) + "px";
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canvas.style.top = (height / 2) + "px";
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///
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centerSpan();
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///
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var offset = 0;
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var ctx = canvas.getContext('2d');
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ctx.globalCompositeOperation = "lighter";
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ctx.shadowOffsetX = 1;
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ctx.shadowOffsetY = 1;
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ctx.shadowBlur = 1;
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ctx.shadowColor = 'rgba(0, 0, 0, 0.5)';
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//
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function animate() {
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var windowSize = getWindowSize();
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var width = windowSize.width - size;
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var height = windowSize.height - size;
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//
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canvas.style.left = (width / 2) + "px";
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canvas.style.top = (height / 2) + "px";
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centerSpan();
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//
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ctx.save();
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ctx.clearRect(0, 0, size, size);
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ctx.translate(size / 2, size / 2);
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var hues = 360 - 360 / bars;
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for (var i = 0; i < bars; i++) {
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var angle = (i / bars * 2 * PI) + offset;
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ctx.save();
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ctx.translate(radius * Math.sin(-angle), radius * Math.cos(-angle));
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ctx.rotate(angle);
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// round-rect properties
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var x = -conf.lineWidth / 2;
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var y = 0;
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var width = conf.lineWidth;
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var height = conf.lineHeight;
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var curve = width / 2;
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// round-rect path
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ctx.beginPath();
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ctx.moveTo(x + curve, y);
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ctx.lineTo(x + width - curve, y);
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ctx.quadraticCurveTo(x + width, y, x + width, y + curve);
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ctx.lineTo(x + width, y + height - curve);
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ctx.quadraticCurveTo(x + width, y + height, x + width - curve, y + height);
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ctx.lineTo(x + curve, y + height);
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ctx.quadraticCurveTo(x, y + height, x, y + height - curve);
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ctx.lineTo(x, y + curve);
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ctx.quadraticCurveTo(x, y, x + curve, y);
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// round-rect fill
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var hue = ((i / (bars - 1)) * hues);
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ctx.fillStyle = "hsla(" + hue + ", 100%, 50%, 0.85)";
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ctx.fill();
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ctx.restore();
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}
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ctx.restore();
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offset += 0.07;
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//
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if (conf.messageAnimate) {
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var iteration = offset / 0.07 >> 0;
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if (iteration % 10 === 0) {
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var length = conf.messageAnimate.length;
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var n = iteration / 10 % length;
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that.span.innerHTML = conf.message + conf.messageAnimate[n];
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}
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}
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};
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this.css = function() {
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var background = conf.background ? conf.background : "rgba(0,0,0,0.65)";
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span.style.cssText = "font-family: monospace; font-size: 14px; opacity: 1; display: none; background: "+background+"; border-radius: 10px; padding: 10px; width: 200px; text-align: center; position: absolute; z-index: 10000;";
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div.style.cssText = "color: #fff; -webkit-transition-property: opacity; -webkit-transition-duration: " + timeout + "s; position: fixed; left: 0; top: 0; width: 100%; height: 100%; z-index: 100000; opacity: 0; display: none";
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if (this.stopPropagation) {
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div.style.cssText += "background: rgba(0,0,0,0.25);";
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} else {
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div.style.cssText += "pointer-events: none;";
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}
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};
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this.stop = function () {
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setTimeout(function() {
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window.clearInterval(that.interval);
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delete that.interval;
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}, 50);
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if (canvas && canvas.style) {
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div.style.cssText += "pointer-events: none;";
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canvas.parentNode.style.opacity = 0;
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window.setTimeout(function () {
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that.stopPropagation = false;
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canvas.parentNode.style.display = "none";
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ctx.clearRect(0, 0, size, size);
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}, timeout * 1000);
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}
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};
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this.start = function (callback) {
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this.css();
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var windowSize = getWindowSize();
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var width = windowSize.width - size;
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var height = windowSize.height - size;
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canvas.parentNode.style.opacity = 1;
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canvas.parentNode.style.display = "block";
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that.span.style.display = conf.message ? "block" : "none";
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if (conf.background) that.div.style.background = conf.backgrond;
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canvas.style.left = (width / 2) + "px";
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canvas.style.top = (height / 2) + "px";
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if (!conf.delay) animate();
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window.clearInterval(this.interval);
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this.interval = window.setInterval(animate, 30);
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if (conf.message) {
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compileMessage(conf.message, callback);
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}
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};
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this.message = function(message, callback) {
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conf.message = message;
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if (!this.interval) return this.start(callback);
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if (conf.background) that.span.style.background = conf.backgrond;
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compileMessage(conf.message, callback);
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that.span.style.display = conf.message ? "block" : "none";
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};
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var compileMessage = function(message, callback) {
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if (message.substr(-3) === "...") {
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conf.message = message.substr(0, message.length - 3);
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conf.messageAnimate = [ ". ",".. ","..." ].reverse();
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that.span.innerHTML = conf.message + conf.messageAnimate[0];
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} else {
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conf.messageAnimate = false;
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that.span.innerHTML = conf.message;
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}
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if (callback) {
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setTimeout(callback, 50);
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}
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};
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//
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if (conf.display === false) return this;
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//
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this.css();
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this.start();
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//
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return this;
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};
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})(widgets); |