* @param {!Window} win * @param {number} purgeTimeout
(win, purgeTimeout)
| 15 | * @param {number} purgeTimeout |
| 16 | */ |
| 17 | constructor(win, purgeTimeout) { |
| 18 | /** @const {!Window} */ |
| 19 | this.win = win; |
| 20 | |
| 21 | /** @private @const {number} */ |
| 22 | this.purgeTimeout_ = purgeTimeout; |
| 23 | |
| 24 | /** @private @const {!Array<!{el: !Element, time: time}>} */ |
| 25 | this.history_ = []; |
| 26 | |
| 27 | /** @private @const {!Observable<!Element>} */ |
| 28 | this.observeFocus_ = new Observable(); |
| 29 | |
| 30 | /** |
| 31 | * @private |
| 32 | * @param {!Event} e |
| 33 | */ |
| 34 | this.captureFocus_ = (e) => { |
| 35 | // Hack (#15079) due to Firefox firing focus events on the entire page |
| 36 | if (isElement(e.target)) { |
| 37 | this.pushFocus_(dev().assertElement(e.target)); |
| 38 | } |
| 39 | }; |
| 40 | |
| 41 | /** |
| 42 | * @private |
| 43 | * @param {*} unusedE |
| 44 | */ |
| 45 | this.captureBlur_ = (unusedE) => { |
| 46 | // IFrame elements do not receive `focus` event. An alternative way is |
| 47 | // implemented here. We wait for a blur to arrive on the main window |
| 48 | // and after a short time check which element is active. |
| 49 | Services.timerFor(win).delay(() => { |
| 50 | if (this.win.document.activeElement) { |
| 51 | this.pushFocus_(this.win.document.activeElement); |
| 52 | } |
| 53 | }, 500); |
| 54 | }; |
| 55 | this.win.document.addEventListener('focus', this.captureFocus_, true); |
| 56 | this.win.addEventListener('blur', this.captureBlur_); |
| 57 | } |
| 58 | |
| 59 | /** @visibleForTesting */ |
| 60 | cleanup_() { |
nothing calls this directly
no test coverage detected