istio.io/src/ts/resizeObserver.js

33 lines
983 B
JavaScript

// Copyright Istio Authors
//
// 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.
"use strict";
function observeResize(el, callback) {
if (window.ResizeObserver) {
const ro = new ResizeObserver(entries => {
for (let entry of entries) {
callback(entry.target);
}
});
ro.observe(el);
} else {
// simple fallback...
listen(window, "resize", () => {
callback(el);
});
}
}