Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 | 19x 19x | import { useEffect } from "react";
import { useOnSmallScreen } from "./useOnSmallScreen";
interface UseDynamicFontSizeProps {
element: HTMLHeadingElement | null;
maxFontSize: number;
minFontSize: number;
maxHeight: number;
lineNum?: number;
}
function measureText(
pText: string,
pFontSize: number,
width: number,
maxHeight: number,
lineNum: number
) {
let lDiv: HTMLDivElement | null = document.createElement("div");
document.body.appendChild(lDiv);
lDiv.style.fontSize = `${pFontSize}px`;
lDiv.style.position = "absolute";
lDiv.style.left = "-1000";
lDiv.style.top = "-1000";
lDiv.style.maxWidth = `${width}px`;
lDiv.style.maxHeight = `${maxHeight}px`;
lDiv.style.webkitLineClamp = `${lineNum}`;
lDiv.style.textOverflow = "ellipsis";
lDiv.style.overflow = "hidden";
lDiv.style.webkitBoxOrient = "vertical";
lDiv.style.display = "-webkit-box";
lDiv.style.lineHeight = "1";
lDiv.textContent = pText;
const lResult = {
width: lDiv.scrollWidth,
height: lDiv.scrollHeight,
};
document.body.removeChild(lDiv);
lDiv = null;
return lResult;
}
export function fitText(
el: HTMLHeadingElement,
maxFontSize: number,
minFontSize: number,
maxHeight: number,
lineNum: number
): void {
const text = el.textContent;
Iif (!text) return;
const computedStyles = getComputedStyle(el);
let fsize = parseInt(computedStyles.fontSize);
fsize = Math.max(fsize, minFontSize);
const { width } = el.getBoundingClientRect();
const measured = measureText(text, fsize, width, maxHeight, lineNum);
const letsBeTrue = true;
if (measured.width > width || measured.height > maxHeight) {
while (letsBeTrue) {
fsize = parseInt(computedStyles.fontSize);
const m = measureText(text, fsize, width, maxHeight, lineNum);
if ((m.width > width && fsize > minFontSize) || m.height > maxHeight) {
el.style.fontSize = `${--fsize}px`;
} else {
break;
}
}
} else {
while (letsBeTrue) {
fsize = parseInt(computedStyles.fontSize);
const m = measureText(text, fsize, width, maxHeight, lineNum);
if (m.width < width - 4 && fsize < maxFontSize) {
el.style.fontSize = `${++fsize}px`;
} else {
break;
}
}
}
}
export function useDynamicFontSize({
element,
maxFontSize,
minFontSize,
maxHeight,
lineNum = 1,
}: UseDynamicFontSizeProps): void {
const isSmallScreen = useOnSmallScreen();
useEffect(() => {
Iif (isSmallScreen) {
Iif (!element) return;
element.style.fontSize = `${minFontSize}px`;
return;
}
const handleResize = () => {
Iif (element) {
fitText(element, maxFontSize, minFontSize, maxHeight, lineNum);
}
};
window.addEventListener("resize", handleResize);
handleResize();
return () => {
window.removeEventListener("resize", handleResize);
Iif (!element) return;
element.style.fontSize = "";
};
}, [
element,
maxFontSize,
element?.textContent,
minFontSize,
maxHeight,
lineNum,
isSmallScreen,
]);
}
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