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Observing "MemoryWarningNotification" and proxying it up to the DeviceEventEmitter

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This commit is contained in:
Jared Forsyth
2015-05-22 12:57:08 -07:00
parent 56d6ee3f0f
commit aad54006e3
3 changed files with 57 additions and 12 deletions
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41
Libraries/AppStateIOS/AppStateIOS.ios.js
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@@ -16,10 +16,12 @@ var RCTDeviceEventEmitter = require('RCTDeviceEventEmitter');
var RCTAppState = NativeModules.AppState;
var logError = require('logError');
var invariant = require('invariant');
var DEVICE_APPSTATE_EVENT = 'appStateDidChange';
var _appStateHandlers = {};
var _eventHandlers = {
change: new Map(),
memoryWarning: new Map(),
};
/**
* `AppStateIOS` can tell you if the app is in the foreground or background,
@@ -82,12 +84,23 @@ var AppStateIOS = {
type: string,
handler: Function
) {
_appStateHandlers[handler] = RCTDeviceEventEmitter.addListener(
DEVICE_APPSTATE_EVENT,
(appStateData) => {
handler(appStateData.app_state);
}
invariant(
['change', 'memoryWarning'].indexOf(type) !== -1,
'Trying to subscribe to unknown event: "%s"', type
);
if (type === 'change') {
_eventHandlers[type].set(handler, RCTDeviceEventEmitter.addListener(
'appStateDidChange',
(appStateData) => {
handler(appStateData.app_state);
}
));
} else if (type === 'memoryWarning') {
_eventHandlers[type].set(handler, RCTDeviceEventEmitter.addListener(
'memoryWarning',
handler
));
}
},
/**
@@ -97,11 +110,15 @@ var AppStateIOS = {
type: string,
handler: Function
) {
if (!_appStateHandlers[handler]) {
invariant(
['change', 'memoryWarning'].indexOf(type) !== -1,
'Trying to remove listener for unknown event: "%s"', type
);
if (!_eventHandlers[type].has(handler)) {
return;
}
_appStateHandlers[handler].remove();
_appStateHandlers[handler] = null;
_eventHandlers[type].get(handler).remove();
_eventHandlers[type].delete(handler);
},
currentState: (null : ?String),
@@ -109,7 +126,7 @@ var AppStateIOS = {
};
RCTDeviceEventEmitter.addListener(
DEVICE_APPSTATE_EVENT,
'appStateDidChange',
(appStateData) => {
AppStateIOS.currentState = appStateData.app_state;
}