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use passive event listener for mousewheel

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This commit is contained in:
Matthew Hodgson 2016-09-06 12:10:43 +01:00
parent e5dd2e0b46
commit c2f2fb3816
1 changed files with 4 additions and 2 deletions
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6
src/UserActivity.js
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@ -37,7 +37,8 @@ class UserActivity {
// itself being scrolled. Need to use addEventListener's useCapture.
// also this needs to be the wheel event, not scroll, as scroll is
// fired when the view scrolls down for a new message.
window.addEventListener('wheel', this._onUserActivity.bind(this), true);
window.addEventListener('wheel', this._onUserActivity.bind(this),
{ passive: true, capture: true });
this.lastActivityAtTs = new Date().getTime();
this.lastDispatchAtTs = 0;
this.activityEndTimer = undefined;
@ -50,7 +51,8 @@ class UserActivity {
document.onmousedown = undefined;
document.onmousemove = undefined;
document.onkeypress = undefined;
window.removeEventListener('wheel', this._onUserActivity.bind(this), true);
window.removeEventListener('wheel', this._onUserActivity.bind(this),
{ passive: true, capture: true });
}
/**