mirror of
https://github.com/vector-im/element-web.git
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109 lines
3.7 KiB
JavaScript
109 lines
3.7 KiB
JavaScript
/*
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Copyright 2015, 2016 OpenMarket Ltd
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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var dis = require("./dispatcher");
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var MIN_DISPATCH_INTERVAL_MS = 500;
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var CURRENTLY_ACTIVE_THRESHOLD_MS = 2000;
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/**
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* This class watches for user activity (moving the mouse or pressing a key)
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* and dispatches the user_activity action at times when the user is interacting
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* with the app (but at a much lower frequency than mouse move events)
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*/
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class UserActivity {
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/**
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* Start listening to user activity
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*/
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start() {
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document.onmousedown = this._onUserActivity.bind(this);
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document.onmousemove = this._onUserActivity.bind(this);
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document.onkeydown = this._onUserActivity.bind(this);
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// can't use document.scroll here because that's only the document
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// itself being scrolled. Need to use addEventListener's useCapture.
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// also this needs to be the wheel event, not scroll, as scroll is
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// fired when the view scrolls down for a new message.
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window.addEventListener('wheel', this._onUserActivity.bind(this),
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{ passive: true, capture: true });
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this.lastActivityAtTs = new Date().getTime();
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this.lastDispatchAtTs = 0;
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this.activityEndTimer = undefined;
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}
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/**
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* Stop tracking user activity
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*/
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stop() {
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document.onmousedown = undefined;
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document.onmousemove = undefined;
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document.onkeydown = undefined;
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window.removeEventListener('wheel', this._onUserActivity.bind(this),
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{ passive: true, capture: true });
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}
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/**
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* Return true if there has been user activity very recently
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* (ie. within a few seconds)
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*/
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userCurrentlyActive() {
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return this.lastActivityAtTs > new Date().getTime() - CURRENTLY_ACTIVE_THRESHOLD_MS;
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}
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_onUserActivity(event) {
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if (event.screenX && event.type == "mousemove") {
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if (event.screenX === this.lastScreenX &&
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event.screenY === this.lastScreenY)
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{
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// mouse hasn't actually moved
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return;
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}
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this.lastScreenX = event.screenX;
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this.lastScreenY = event.screenY;
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}
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this.lastActivityAtTs = new Date().getTime();
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if (this.lastDispatchAtTs < this.lastActivityAtTs - MIN_DISPATCH_INTERVAL_MS) {
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this.lastDispatchAtTs = this.lastActivityAtTs;
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dis.dispatch({
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action: 'user_activity'
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});
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if (!this.activityEndTimer) {
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this.activityEndTimer = setTimeout(
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this._onActivityEndTimer.bind(this), MIN_DISPATCH_INTERVAL_MS
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);
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}
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}
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}
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_onActivityEndTimer() {
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var now = new Date().getTime();
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var targetTime = this.lastActivityAtTs + MIN_DISPATCH_INTERVAL_MS;
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if (now >= targetTime) {
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dis.dispatch({
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action: 'user_activity_end'
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});
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this.activityEndTimer = undefined;
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} else {
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this.activityEndTimer = setTimeout(
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this._onActivityEndTimer.bind(this), targetTime - now
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);
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}
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}
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}
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module.exports = new UserActivity();
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