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[fix] AppState should not throw for 'memoryWarning' event

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This commit is contained in:
Nicolas Gallagher
2018-05-09 10:52:44 -07:00
parent 2237777341
commit 4bc16fa3eb
1 changed files with 16 additions and 12 deletions
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28
packages/react-native-web/src/exports/AppState/index.js vendored
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@@ -16,7 +16,7 @@ import invariant from 'fbjs/lib/invariant';
const isPrefixed =
canUseDOM && !document.hasOwnProperty('hidden') && document.hasOwnProperty('webkitHidden');
const EVENT_TYPES = ['change'];
const EVENT_TYPES = ['change', 'memoryWarning'];
const VISIBILITY_CHANGE_EVENT = isPrefixed ? 'webkitvisibilitychange' : 'visibilitychange';
const VISIBILITY_STATE_PROPERTY = isPrefixed ? 'webkitVisibilityState' : 'visibilityState';
@@ -52,9 +52,11 @@ export default class AppState {
'Trying to subscribe to unknown event: "%s"',
type
);
const callback = () => handler(AppState.currentState);
listeners.push([handler, callback]);
document.addEventListener(VISIBILITY_CHANGE_EVENT, callback, false);
if (type === 'change') {
const callback = () => handler(AppState.currentState);
listeners.push([handler, callback]);
document.addEventListener(VISIBILITY_CHANGE_EVENT, callback, false);
}
}
}
@@ -65,14 +67,16 @@ export default class AppState {
'Trying to remove listener for unknown event: "%s"',
type
);
const listenerIndex = findIndex(listeners, pair => pair[0] === handler);
invariant(
listenerIndex !== -1,
'Trying to remove AppState listener for unregistered handler'
);
const callback = listeners[listenerIndex][1];
document.removeEventListener(VISIBILITY_CHANGE_EVENT, callback, false);
listeners.splice(listenerIndex, 1);
if (type === 'change') {
const listenerIndex = findIndex(listeners, pair => pair[0] === handler);
invariant(
listenerIndex !== -1,
'Trying to remove AppState listener for unregistered handler'
);
const callback = listeners[listenerIndex][1];
document.removeEventListener(VISIBILITY_CHANGE_EVENT, callback, false);
listeners.splice(listenerIndex, 1);
}
}
}
}