Merge pull request #6364 from p-jackson/issue-5700
Don't wrap drag events in IE/Edge in dev builds
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commit
2e8f28c29f
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@ -11,6 +11,8 @@
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'use strict';
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var SyntheticDragEvent = require('SyntheticDragEvent');
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var caughtError = null;
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/**
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@ -65,6 +67,11 @@ if (__DEV__) {
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typeof document.createEvent === 'function') {
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var fakeNode = document.createElement('react');
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ReactErrorUtils.invokeGuardedCallback = function(name, func, a, b) {
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if (!canWrapEvent(a)) {
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invokeGuardedCallback(name, func, a, b);
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return;
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}
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var boundFunc = func.bind(null, a, b);
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var evtType = `react-${name}`;
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fakeNode.addEventListener(evtType, boundFunc, false);
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@ -74,6 +81,41 @@ if (__DEV__) {
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fakeNode.removeEventListener(evtType, boundFunc, false);
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};
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}
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var cacheCanWrapEvent = null;
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/**
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* IE and Edge don't allow access to the DataTransfer.dropEffect property when
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* it's wrapped in another event. This function detects whether we're in an
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* environment that behaves this way.
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*
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* @param {*} ev Event that is being tested
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*/
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function canWrapEvent(ev) {
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if (!(ev instanceof SyntheticDragEvent)) {
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return true;
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} else if (cacheCanWrapEvent !== null) {
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return cacheCanWrapEvent;
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}
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var canAccessDropEffect = false;
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function handleWrappedEvent() {
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try {
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ev.dataTransfer.dropEffect; // eslint-disable-line no-unused-expressions
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canAccessDropEffect = true;
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} catch (e) {}
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}
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var wrappedEventName = 'react-wrappeddragevent';
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var wrappedEvent = document.createEvent('Event');
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wrappedEvent.initEvent(wrappedEventName, false, false);
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fakeNode.addEventListener(wrappedEventName, handleWrappedEvent, false);
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fakeNode.dispatchEvent(wrappedEvent);
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fakeNode.removeEventListener(wrappedEventName, handleWrappedEvent, false);
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cacheCanWrapEvent = canAccessDropEffect;
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return canAccessDropEffect;
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}
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}
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module.exports = ReactErrorUtils;
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