@blueprintjs/core
Version:
Core styles & components
74 lines • 2.2 kB
JavaScript
/*
* Copyright 2020 Palantir Technologies, Inc. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
export function isRefObject(value) {
return value != null && typeof value.current !== "undefined";
}
export function isRefCallback(value) {
return typeof value === "function";
}
export function combineRefs(ref1, ref2) {
return mergeRefs(ref1, ref2);
}
export function mergeRefs() {
var refs = [];
for (var _i = 0; _i < arguments.length; _i++) {
refs[_i] = arguments[_i];
}
return function (value) {
refs.forEach(function (ref) {
if (isRefCallback(ref)) {
ref(value);
}
else if (isRefObject(ref)) {
ref.current = value;
}
});
};
}
export function getRef(ref) {
var _a;
if (ref === null) {
return null;
}
return (_a = ref.current) !== null && _a !== void 0 ? _a : ref;
}
/**
* Assign the given ref to a target, either a React ref object or a callback which takes the ref as its first argument.
*/
export function setRef(refTarget, ref) {
if (refTarget === undefined) {
return;
}
if (isRefObject(refTarget)) {
refTarget.current = ref;
}
else if (isRefCallback(refTarget)) {
refTarget(ref);
}
}
export function refHandler(refTargetParent, refTargetKey, refProp) {
if (isRefObject(refProp)) {
refTargetParent[refTargetKey] = refProp;
return refProp;
}
return function (ref) {
refTargetParent[refTargetKey] = ref;
if (isRefCallback(refProp)) {
refProp(ref);
}
};
}
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