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Fixes text jumping on creation (#266)

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* Fixes text jumping on creation

* Do not remove node on ESC

* Fixed typo
This commit is contained in:
Timur Khazamov 2020-01-09 00:06:25 +05:00 • committed by GitHub
parent 2122a9cf9f
commit 37934c0f8b
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5 changed files with 52 additions and 23 deletions
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27
src/utils.ts
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@ -23,3 +23,30 @@ export function isInputLike(
target instanceof HTMLSelectElement
);
}
// https://github.com/grassator/canvas-text-editor/blob/master/lib/FontMetrics.js
export function measureText(text: string, font: string) {
const line = document.createElement("div");
const body = document.body;
line.style.position = "absolute";
line.style.whiteSpace = "nowrap";
line.style.font = font;
body.appendChild(line);
// Now we can measure width and height of the letter
line.innerHTML = text;
const width = line.offsetWidth;
const height = line.offsetHeight;
// Now creating 1px sized item that will be aligned to baseline
// to calculate baseline shift
const span = document.createElement("span");
span.style.display = "inline-block";
span.style.overflow = "hidden";
span.style.width = "1px";
span.style.height = "1px";
line.appendChild(span);
// Baseline is important for positioning text on canvas
const baseline = span.offsetTop + span.offsetHeight;
document.body.removeChild(line);
return { width, height, baseline };
}