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frontend/node_modules/rc-input-number/lib/hooks/useCursor.js

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