ngx-extended-pdf-viewer/esm2015/lib/unit-to-px.js

Embedding PDF files in your Angular application. Highly configurable viewer including the toolbar, sidebar, and all the features you're used to.

export class UnitToPx {
    static initElements() {
        // this.con = document.createElement('div');
        this.con.style.position = 'absolute';
        this.con.style.width = '0';
        this.con.style.height = '0';
        this.con.style.visibility = 'hidden';
        this.con.style.overflow = 'hidden';
        // this.el = document.createElement('div');
        this.con.appendChild(this.el);
    }
    static pxPerUnit(unit) {
        if (!this.pxPerUnitCache[unit]) {
            if (!this.con) {
                this.initElements();
            }
            this.el.style.width = this.sample + unit;
            document.body.appendChild(this.con);
            var dimension = this.el.getBoundingClientRect();
            this.con.parentNode.removeChild(this.con);
            this.pxPerUnitCache[unit] = dimension.width / this.sample;
        }
        return this.pxPerUnitCache[unit];
    }
    static toPx(length) {
        var unitRe = /^\s*([+-]?[\d\.]*)\s*(.*)\s*$/i;
        var match = unitRe.exec(length);
        if (match != null && match.length > 2) {
            const bare = match[1] === '';
            const val = bare ? 1 : Number(match[1]);
            const unit = match[2];
            const valid = !isNaN(val) && unit;
            if (valid) {
                return unit == 'px' ? val : this.pxPerUnit(unit) * val;
            }
        }
        throw new TypeError('Error parsing length');
    }
}
// cache this.con, el for reused
UnitToPx.con = document.createElement('div');
UnitToPx.el = document.createElement('div');
// high sample will more accurate?
UnitToPx.sample = 100;
UnitToPx.pxPerUnitCache = {};
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