keyboard-height/lib/ios.js

calaculate the height of soft keyboard in mobile phone and emit on changes

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = _default;
exports.getIosHeight = getIosHeight;
exports.getIosInnerHeight = getIosInnerHeight;

function _typeof(obj) { "@babel/helpers - typeof"; if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }

// innerHeight 在 ios 下可能变化，比如导航条有时候收起、展开
var vp = window["visualViewport"];

function isSame(a, b) {
  return Math.abs(a - b) < 0.01;
}

var lastHeight = -1;

function _default(cbArr) {
  if (!vp || _typeof(vp) !== "object") return;

  function emit() {
    var delta = getIosHeight();
    if (isSame(delta, lastHeight)) return;
    lastHeight = delta;
    cbArr.forEach(function (cb) {
      cb.call(null, lastHeight);
    });
  }

  vp.onscroll = function () {
    emit();
  };

  vp.onresize = function () {
    emit();
  };
}

function getIosHeight() {
  if (!vp) return 0;
  return document.documentElement.clientHeight - vp.height;
}

function getIosInnerHeight() {
  return innerHeight;
}