spin.js/spin.js

A spinning activity indicator

var __assign = (this && this.__assign) || function () {
    __assign = Object.assign || function(t) {
        for (var s, i = 1, n = arguments.length; i < n; i++) {
            s = arguments[i];
            for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
                t[p] = s[p];
        }
        return t;
    };
    return __assign.apply(this, arguments);
};
var defaults = {
    lines: 12,
    length: 7,
    width: 5,
    radius: 10,
    scale: 1.0,
    corners: 1,
    color: '#000',
    fadeColor: 'transparent',
    animation: 'spinner-line-fade-default',
    rotate: 0,
    direction: 1,
    speed: 1,
    zIndex: 2e9,
    className: 'spinner',
    top: '50%',
    left: '50%',
    shadow: '0 0 1px transparent', // prevent aliased lines
    position: 'absolute',
};
var Spinner = /** @class */ (function () {
    function Spinner(opts) {
        if (opts === void 0) { opts = {}; }
        this.opts = __assign(__assign({}, defaults), opts);
    }
    /**
     * Adds the spinner to the given target element. If this instance is already
     * spinning, it is automatically removed from its previous target by calling
     * stop() internally.
     */
    Spinner.prototype.spin = function (target) {
        this.stop();
        this.el = document.createElement('div');
        this.el.className = this.opts.className;
        this.el.setAttribute('role', 'progressbar');
        this.el.style.position = this.opts.position;
        this.el.style.width = "0";
        this.el.style.zIndex = this.opts.zIndex.toString();
        this.el.style.left = this.opts.left;
        this.el.style.top = this.opts.top;
        this.el.style.transform = "scale(".concat(this.opts.scale, ")");
        if (target) {
            target.insertBefore(this.el, target.firstChild || null);
        }
        drawLines(this.el, this.opts);
        return this;
    };
    /**
     * Stops and removes the Spinner.
     * Stopped spinners may be reused by calling spin() again.
     */
    Spinner.prototype.stop = function () {
        if (this.el) {
            if (this.el.parentNode) {
                this.el.parentNode.removeChild(this.el);
            }
            this.el = undefined;
        }
        return this;
    };
    return Spinner;
}());
export { Spinner };
/**
 * Returns the line color from the given string or array.
 */
function getColor(color, idx) {
    return typeof color == 'string' ? color : color[idx % color.length];
}
/**
 * Internal method that draws the individual lines.
 */
function drawLines(el, opts) {
    var borderRadius = (Math.round(opts.corners * opts.width * 500) / 1000) + 'px';
    var shadow = 'none';
    if (opts.shadow === true) {
        shadow = '0 2px 4px #000'; // default shadow
    }
    else if (typeof opts.shadow === 'string') {
        shadow = opts.shadow;
    }
    var shadows = parseBoxShadow(shadow);
    for (var i = 0; i < opts.lines; i++) {
        var degrees = ~~(360 / opts.lines * i + opts.rotate);
        var backgroundLine = document.createElement('div');
        backgroundLine.style.position = 'absolute';
        backgroundLine.style.top = "".concat(-opts.width / 2, "px");
        backgroundLine.style.width = (opts.length + opts.width) + 'px';
        backgroundLine.style.height = opts.width + 'px';
        backgroundLine.style.background = getColor(opts.fadeColor, i);
        backgroundLine.style.borderRadius = borderRadius;
        backgroundLine.style.transformOrigin = 'left';
        backgroundLine.style.transform = "rotate(".concat(degrees, "deg) translateX(").concat(opts.radius, "px)");
        var delay = i * opts.direction / opts.lines / opts.speed;
        delay -= 1 / opts.speed; // so initial animation state will include trail
        var line = document.createElement('div');
        line.style.width = '100%';
        line.style.height = '100%';
        line.style.background = getColor(opts.color, i);
        line.style.borderRadius = borderRadius;
        line.style.boxShadow = normalizeShadow(shadows, degrees);
        line.style.animation = "".concat(1 / opts.speed, "s linear ").concat(delay, "s infinite ").concat(opts.animation);
        backgroundLine.appendChild(line);
        el.appendChild(backgroundLine);
    }
}
function parseBoxShadow(boxShadow) {
    var regex = /^\s*([a-zA-Z]+\s+)?(-?\d+(\.\d+)?)([a-zA-Z]*)\s+(-?\d+(\.\d+)?)([a-zA-Z]*)(.*)$/;
    var shadows = [];
    for (var _i = 0, _a = boxShadow.split(','); _i < _a.length; _i++) {
        var shadow = _a[_i];
        var matches = shadow.match(regex);
        if (matches === null) {
            continue; // invalid syntax
        }
        var x = +matches[2];
        var y = +matches[5];
        var xUnits = matches[4];
        var yUnits = matches[7];
        if (x === 0 && !xUnits) {
            xUnits = yUnits;
        }
        if (y === 0 && !yUnits) {
            yUnits = xUnits;
        }
        if (xUnits !== yUnits) {
            continue; // units must match to use as coordinates
        }
        shadows.push({
            prefix: matches[1] || '', // could have value of 'inset' or undefined
            x: x,
            y: y,
            xUnits: xUnits,
            yUnits: yUnits,
            end: matches[8],
        });
    }
    return shadows;
}
/**
 * Modify box-shadow x/y offsets to counteract rotation
 */
function normalizeShadow(shadows, degrees) {
    var normalized = [];
    for (var _i = 0, shadows_1 = shadows; _i < shadows_1.length; _i++) {
        var shadow = shadows_1[_i];
        var xy = convertOffset(shadow.x, shadow.y, degrees);
        normalized.push(shadow.prefix + xy[0] + shadow.xUnits + ' ' + xy[1] + shadow.yUnits + shadow.end);
    }
    return normalized.join(', ');
}
function convertOffset(x, y, degrees) {
    var radians = degrees * Math.PI / 180;
    var sin = Math.sin(radians);
    var cos = Math.cos(radians);
    return [
        Math.round((x * cos + y * sin) * 1000) / 1000,
        Math.round((-x * sin + y * cos) * 1000) / 1000,
    ];
}