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Add option for different types of dimensions #31

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Add option for different types of dimensions #31

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30 changes: 26 additions & 4 deletions src/index.js
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
import { useEffect, useState, useRef, useMemo } from "react";

export default function({ ref, onResize } = {}) {
export default function({ ref, onResize, type } = {}) {
// `defaultRef` Has to be non-conditionally declared here whether or not it'll
// be used as that's how hooks work.
// @see https://reactjs.org/docs/hooks-rules.html#explanation
Expand Down Expand Up @@ -40,9 +40,31 @@ export default function({ ref, onResize } = {}) {

const entry = entries[0];

// `Math.round` is in line with how CSS resolves sub-pixel values
const newWidth = Math.round(entry.contentRect.width);
const newHeight = Math.round(entry.contentRect.height);
let newWidth, newHeight;
switch (type) {
case "scroll":
// Actual size of content and padding, including content hidden by
// element-level scroll bars
newWidth = entry.target.scrollWidth;
newHeight = entry.target.scrollHeight;
break;
case "client":
// Displayed size of content and padding
newWidth = entry.target.clientWidth;
newHeight = entry.target.clientHeight;
break;
case "offset":
// Displayed size of content, padding, and border
newWidth = entry.target.offsetWidth;
newHeight = entry.target.offsetHeight;
break;
case "content":
default:
// Displayed size of content only
// `Math.round` is in line with how CSS resolves sub-pixel values
newWidth = Math.round(entry.contentRect.width);
newHeight = Math.round(entry.contentRect.height);
}
if (
previous.current.width !== newWidth ||
previous.current.height !== newHeight
Expand Down