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fix(event-manager): shadow dom event bubbling #758

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merged 9 commits into from Sep 5, 2019
Merged

fix(event-manager): shadow dom event bubbling #758

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7563566
fix(event-manager): shadow dom event bubbling
michaelw85 Jul 16, 2019
434b98f
Prevent calling parentNode multiple times.
michaelw85 Jul 16, 2019
eae0142
Dist did not include changes, manual build required?
michaelw85 Jul 16, 2019
58829d6
Replace string check with instanceof to detect shadowRoot
michaelw85 Jul 19, 2019
a2721b9
#755 Add flag for new behavior, defaults to original
michaelw85 Aug 13, 2019
5193bee
Replace arrow function to improve performance
michaelw85 Aug 30, 2019
48099e7
Fix event issue in unit test
michaelw85 Aug 30, 2019
766352b
Update based on review feedback
michaelw85 Sep 3, 2019
de5b880
Revert changes to dist
michaelw85 Sep 3, 2019
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157 changes: 84 additions & 73 deletions dist/amd/aurelia-binding.js
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65 changes: 37 additions & 28 deletions dist/aurelia-binding.js
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Expand Up @@ -3282,49 +3282,53 @@ class CapturedHandlerEntry {
}
}

function handleDelegatedEvent(event) {
event.propagationStopped = false;
let target = findOriginalEventTarget(event);
class DelegateHandlerEntry {
constructor(eventName, eventManager) {
this.eventName = eventName;
this.count = 0;
this.eventManager = eventManager;
}

while (target && !event.propagationStopped) {
if (target.delegatedCallbacks) {
let callback = target.delegatedCallbacks[event.type];
if (callback) {
if (event.stopPropagation !== stopPropagation) {
event.standardStopPropagation = event.stopPropagation;
event.stopPropagation = stopPropagation;
}
if ('handleEvent' in callback) {
callback.handleEvent(event);
} else {
callback(event);
handleDelegatedEvent = event => {
event.propagationStopped = false;
let target = findOriginalEventTarget(event);

while (target && !event.propagationStopped) {
if (target.delegatedCallbacks) {
let callback = target.delegatedCallbacks[event.type];
if (callback) {
if (event.stopPropagation !== stopPropagation) {
event.standardStopPropagation = event.stopPropagation;
event.stopPropagation = stopPropagation;
}
if ('handleEvent' in callback) {
callback.handleEvent(event);
} else {
callback(event);
}
}
}
}

target = target.parentNode;
}
}
const parent = target.parentNode;
const shouldEscapeShadowRoot = this.eventManager.escapeShadowRoot && parent && parent instanceof ShadowRoot;

class DelegateHandlerEntry {
constructor(eventName) {
this.eventName = eventName;
this.count = 0;
target = shouldEscapeShadowRoot ? parent.host : parent;
}
}

increment() {
this.count++;

if (this.count === 1) {
DOM.addEventListener(this.eventName, handleDelegatedEvent, false);
DOM.addEventListener(this.eventName, this.handleDelegatedEvent, false);
}
}

decrement() {
if (this.count === 0) {
emLogger.warn('The same EventListener was disposed multiple times.');
} else if (--this.count === 0) {
DOM.removeEventListener(this.eventName, handleDelegatedEvent, false);
DOM.removeEventListener(this.eventName, this.handleDelegatedEvent, false);
}
}
}
Expand Down Expand Up @@ -3378,6 +3382,10 @@ class DefaultEventStrategy {
delegatedHandlers = {};
capturedHandlers = {};

constructor(eventManager) {
this.eventManager = eventManager;
}

/**
* @param {Element} target
* @param {string} targetEvent
Expand All @@ -3392,7 +3400,7 @@ class DefaultEventStrategy {

if (strategy === delegationStrategy.bubbling) {
delegatedHandlers = this.delegatedHandlers;
handlerEntry = delegatedHandlers[targetEvent] || (delegatedHandlers[targetEvent] = new DelegateHandlerEntry(targetEvent));
handlerEntry = delegatedHandlers[targetEvent] || (delegatedHandlers[targetEvent] = new DelegateHandlerEntry(targetEvent, this.eventManager));
let delegatedCallbacks = target.delegatedCallbacks || (target.delegatedCallbacks = {});
if (!delegatedCallbacks[targetEvent]) {
handlerEntry.increment();
Expand Down Expand Up @@ -3450,9 +3458,10 @@ export const delegationStrategy = {
};

export class EventManager {
constructor() {
constructor(escapeShadowRoot = false) {
this.elementHandlerLookup = {};
this.eventStrategyLookup = {};
this.escapeShadowRoot = escapeShadowRoot;

this.registerElementConfig({
tagName: 'input',
Expand Down Expand Up @@ -3492,7 +3501,7 @@ export class EventManager {
}
});

this.defaultEventStrategy = new DefaultEventStrategy();
this.defaultEventStrategy = new DefaultEventStrategy(this);
}

registerElementConfig(config) {
Expand Down