A UMD build of scrollview-resize
This script should not be not be installed directly. It is a library for other scripts to include with the meta directive // @require https://update.greasyfork.org/scripts/531084/1561338/scrollview-resize-umd.js
(function (global, factory) {
typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
typeof define === 'function' && define.amd ? define(factory) :
(global = typeof globalThis !== 'undefined' ? globalThis : global || self, global.SVResizeObserver = factory());
})(this, (() => {
class SVResizeObserver {
constructor(callback) {
Object.defineProperty(this, "callback", {
enumerable: true,
configurable: true,
writable: true,
value: callback
});
Object.defineProperty(this, "dataset", {
enumerable: true,
configurable: true,
writable: true,
value: []
});
}
/**
* Observing the specified `Element`.
*
* @param target - A reference to an `Element` to be observed.
*/
observe(target, options) {
const resizeObserver = new ResizeObserver(() => this._checkChange());
for (let i = 0; i < target.children.length; i++) resizeObserver.observe(target.children[i]);
const mutationObserver = new MutationObserver(() => {
this._checkChange();
this.unobserve(target);
this.observe.apply(this, arguments);
});
mutationObserver.observe(target, { childList: true });
const [scrollWidth, scrollHeight] = [target.scrollWidth, target.scrollHeight];
this.dataset.push({
target,
entrie: {
target,
scrollWidth,
scrollHeight,
previousScrollWidth: scrollWidth,
previousScrollHeight: scrollHeight,
},
direction: options === null || options === void 0 ? void 0 : options.direction,
resize: resizeObserver,
mutation: mutationObserver
});
}
/**
* Ends the observing of a specified `Element`.
*
* @param target - A reference to an `Element` to be unobserved.
*/
unobserve(target) {
const dataset = [];
for (const data of this.dataset) {
if (data.target === target) {
data.resize.disconnect();
data.mutation.disconnect();
} else dataset.push(data);
}
this.dataset = dataset;
}
/**
* Unobserves all observed `Element` targets.
*/
disconnect() {
for (const data of this.dataset) {
data.resize.disconnect();
data.mutation.disconnect();
}
this.dataset = [];
}
_checkChange() {
let hasChange = false;
const entries = [];
for (const data of this.dataset) {
const [scrollWidth, scrollHeight] = [data.target.scrollWidth, data.target.scrollHeight];
const scrollWidthChange = data.entrie.scrollWidth !== scrollWidth;
const scrollHeightChange = data.entrie.scrollHeight !== scrollHeight;
switch (data.direction) {
case undefined:
hasChange = scrollWidthChange || scrollHeightChange;
break;
case 'x':
hasChange = scrollWidthChange;
break;
case 'y':
hasChange = scrollHeightChange;
break;
}
data.entrie.previousScrollHeight = data.entrie.scrollHeight;
data.entrie.previousScrollWidth = data.entrie.scrollWidth;
data.entrie.scrollWidth = scrollWidth;
data.entrie.scrollHeight = scrollHeight;
entries.push(Object.freeze(Object.assign({}, data.entrie)));
}
if (hasChange) this.callback(entries, this);
}
}
return SVResizeObserver;
}));