75 lines
2.1 KiB
JavaScript
75 lines
2.1 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.default = useCursor;
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var _react = require("react");
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var _warning = _interopRequireDefault(require("@rc-component/util/lib/warning"));
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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/**
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* Keep input cursor in the correct position if possible.
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* Is this necessary since we have `formatter` which may mass the content?
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*/
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function useCursor(input, focused) {
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const selectionRef = (0, _react.useRef)(null);
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function recordCursor() {
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// Record position
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try {
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const {
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selectionStart: start,
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selectionEnd: end,
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value
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} = input;
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const beforeTxt = value.substring(0, start);
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const afterTxt = value.substring(end);
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selectionRef.current = {
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start,
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end,
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value,
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beforeTxt,
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afterTxt
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};
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} catch (e) {
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// Fix error in Chrome:
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// Failed to read the 'selectionStart' property from 'HTMLInputElement'
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// http://stackoverflow.com/q/21177489/3040605
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}
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}
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/**
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* Restore logic:
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* 1. back string same
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* 2. start string same
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*/
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function restoreCursor() {
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if (input && selectionRef.current && focused) {
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try {
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const {
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value
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} = input;
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const {
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beforeTxt,
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afterTxt,
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start
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} = selectionRef.current;
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let startPos = value.length;
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if (value.startsWith(beforeTxt)) {
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startPos = beforeTxt.length;
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} else if (value.endsWith(afterTxt)) {
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startPos = value.length - selectionRef.current.afterTxt.length;
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} else {
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const beforeLastChar = beforeTxt[start - 1];
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const newIndex = value.indexOf(beforeLastChar, start - 1);
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if (newIndex !== -1) {
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startPos = newIndex + 1;
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}
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}
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input.setSelectionRange(startPos, startPos);
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} catch (e) {
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(0, _warning.default)(false, `Something warning of cursor restore. Please fire issue about this: ${e.message}`);
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}
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}
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}
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return [recordCursor, restoreCursor];
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} |