53 lines
1.6 KiB
TypeScript
53 lines
1.6 KiB
TypeScript
export function getDateTime() {
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const date = new Date();
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const year = date.getFullYear();
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const month = date.getMonth() + 1;
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const day = date.getDate();
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const hr = date.getHours();
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const min = date.getMinutes();
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const secs = date.getSeconds();
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return `${year}${month}${day}${hr}${min}${secs}`;
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}
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export function capitalizeString(str: string) {
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return str.charAt(0).toUpperCase() + str.slice(1);
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}
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export function isInputLike(
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target: Element | EventTarget | null
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): target is HTMLInputElement | HTMLTextAreaElement | HTMLSelectElement {
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return (
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target instanceof HTMLInputElement ||
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target instanceof HTMLTextAreaElement ||
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target instanceof HTMLSelectElement
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);
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}
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// https://github.com/grassator/canvas-text-editor/blob/master/lib/FontMetrics.js
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export function measureText(text: string, font: string) {
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const line = document.createElement("div");
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const body = document.body;
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line.style.position = "absolute";
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line.style.whiteSpace = "nowrap";
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line.style.font = font;
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body.appendChild(line);
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// Now we can measure width and height of the letter
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line.innerHTML = text;
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const width = line.offsetWidth;
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const height = line.offsetHeight;
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// Now creating 1px sized item that will be aligned to baseline
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// to calculate baseline shift
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const span = document.createElement("span");
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span.style.display = "inline-block";
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span.style.overflow = "hidden";
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span.style.width = "1px";
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span.style.height = "1px";
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line.appendChild(span);
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// Baseline is important for positioning text on canvas
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const baseline = span.offsetTop + span.offsetHeight;
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document.body.removeChild(line);
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return { width, height, baseline };
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}
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