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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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8
ui/static/js.go
View file

@ -9,7 +9,9 @@ static scrollPageTo(element){let windowScrollPosition=window.pageYOffset;let win
static getVisibleElements(selector){let elements=document.querySelectorAll(selector);let result=[];for(let i=0;i<elements.length;i++){if(this.isVisible(elements[i])){result.push(elements[i]);}}
return result;}
static findParent(element,selector){for(;element&&element!==document;element=element.parentNode){if(element.classList.contains(selector)){return element;}}
return null;}}
return null;}
static hasPassiveEventListenerOption(){var passiveSupported=false;try{var options=Object.defineProperty({},"passive",{get:function(){passiveSupported=true;}});window.addEventListener("test",options,options);window.removeEventListener("test",options,options);}catch(err){passiveSupported=false;}
return passiveSupported;}}
class TouchHandler{constructor(){this.reset();}
reset(){this.touch={start:{x:-1,y:-1},move:{x:-1,y:-1},element:null};}
calculateDistance(){if(this.touch.start.x>=-1&&this.touch.move.x>=-1){let horizontalDistance=Math.abs(this.touch.move.x-this.touch.start.x);let verticalDistance=Math.abs(this.touch.move.y-this.touch.start.y);if(horizontalDistance>30&&verticalDistance<70){return this.touch.move.x-this.touch.start.x;}}
@ -24,7 +26,7 @@ onTouchEnd(event){if(event.touches===undefined){return;}
if(this.touch.element!==null){let distance=Math.abs(this.calculateDistance());if(distance>75){EntryHandler.toggleEntryStatus(this.touch.element);}
this.touch.element.style.opacity=1;this.touch.element.style.transform="none";}
this.reset();}
listen(){let elements=document.querySelectorAll(".touch-item");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);});}}
listen(){let elements=document.querySelectorAll(".touch-item");let hasPassiveOption=DomHelper.hasPassiveEventListenerOption();elements.forEach((element)=>{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);});}}
class KeyboardHandler{constructor(){this.queue=[];this.shortcuts={};}
on(combination,callback){this.shortcuts[combination]=callback;}
listen(){document.onkeydown=(event)=>{if(this.isEventIgnored(event)){return;}
@ -93,5 +95,5 @@ document.addEventListener("DOMContentLoaded",function(){FormHandler.handleSubmit
}
var JavascriptChecksums = map[string]string{
"app": "c090bbc7f503aa032b4cfe68b58bc4754133aaed4f77ff768ac63f41528f55c3",
"app": "ef0457f301b924c25a20fa00e65bfda5437f41bc9ad0a0762b62b9c64b6d0ac5",
}

19
ui/static/js/dom_helper.js
View file

@ -43,4 +43,23 @@ class DomHelper {
return null;
}
static hasPassiveEventListenerOption() {
var passiveSupported = false;
try {
var options = Object.defineProperty({}, "passive", {
get: function() {
passiveSupported = true;
}
});
window.addEventListener("test", options, options);
window.removeEventListener("test", options, options);
} catch(err) {
passiveSupported = false;
}
return passiveSupported;
}
}

9
ui/static/js/touch_handler.js
View file

@ -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);
});
}
}