@tag0/use-text-width/dist/cjs/index.js

React hook to measure text width

'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

var react = require('react');

var getContext = function () {
    var fragment = document.createDocumentFragment();
    var canvas = document.createElement('canvas');
    fragment.appendChild(canvas);
    return canvas.getContext('2d');
};
var getTextWidth = function (currentText, font) {
    var context = getContext();
    context.font = font;
    if (Array.isArray(currentText)) {
        return Math.max.apply(Math, currentText.map(function (t) { return context.measureText(t).width; }));
    }
    else {
        var metrics = context.measureText(currentText);
        return metrics.width;
    }
};
var useTextWidth = function (options) {
    var textOptions = react.useMemo(function () { return ('text' in options ? options : undefined); }, [options]);
    var refOptions = react.useMemo(function () { return ('ref' in options ? options : undefined); }, [options]);
    return react.useMemo(function () {
        var _a, _b;
        if ((_a = refOptions === null || refOptions === void 0 ? void 0 : refOptions.ref.current) === null || _a === void 0 ? void 0 : _a.textContent) {
            var context = getContext();
            var computedStyles = window.getComputedStyle(refOptions.ref.current);
            context.font = computedStyles.font;
            var metrics = context.measureText(refOptions.ref.current.textContent);
            return metrics.width;
        }
        else if (textOptions === null || textOptions === void 0 ? void 0 : textOptions.text) {
            return getTextWidth(textOptions.text, (_b = textOptions.font) !== null && _b !== void 0 ? _b : '16px times');
        }
        return NaN;
    }, [textOptions === null || textOptions === void 0 ? void 0 : textOptions.text, textOptions === null || textOptions === void 0 ? void 0 : textOptions.font, refOptions === null || refOptions === void 0 ? void 0 : refOptions.ref]);
};

exports.useTextWidth = useTextWidth;
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