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Use passive event listeners for touch events

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Avoid this warning in Chrome console: https://www.chromestatus.com/feature/5745543795965952
This commit is contained in:
Frédéric Guillot 2018-07-10 20:41:27 -07:00
parent 6d25e02cb5
commit 3bdb9251da
3 changed files with 29 additions and 7 deletions
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9
ui/static/js/touch_handler.js
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@ -83,12 +83,13 @@ class TouchHandler {
listen() {
let elements = document.querySelectorAll(".touch-item");
let hasPassiveOption = DomHelper.hasPassiveEventListenerOption();
elements.forEach((element) => {
element.addEventListener("touchstart", (e) => this.onTouchStart(e), false);
element.addEventListener("touchmove", (e) => this.onTouchMove(e), false);
element.addEventListener("touchend", (e) => this.onTouchEnd(e), false);
element.addEventListener("touchcancel", () => this.reset(), false);
element.addEventListener("touchstart", (e) => this.onTouchStart(e), hasPassiveOption ? { passive: true } : false);
element.addEventListener("touchmove", (e) => this.onTouchMove(e), hasPassiveOption ? { passive: true } : false);
element.addEventListener("touchend", (e) => this.onTouchEnd(e), hasPassiveOption ? { passive: true } : false);
element.addEventListener("touchcancel", () => this.reset(), hasPassiveOption ? { passive: true } : false);
});
}
}