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author | kumavis <kumavis@users.noreply.github.com> | 2018-02-28 03:25:29 +0800 |
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committer | GitHub <noreply@github.com> | 2018-02-28 03:25:29 +0800 |
commit | 3fefccd37219c9b4b513fc8d929723e07022b9c4 (patch) | |
tree | 22865ecd672570a6162ac3c9402ec9d63ad3f7ef /app/scripts/lib/events-proxy.js | |
parent | 6a7ea00cd34f83b257f6b4280a5f4e20aa5d34ee (diff) | |
parent | ced62ac551a095c8f94f550f0c01a9d4fd04ce5b (diff) | |
download | tangerine-wallet-browser-3fefccd37219c9b4b513fc8d929723e07022b9c4.tar.gz tangerine-wallet-browser-3fefccd37219c9b4b513fc8d929723e07022b9c4.tar.zst tangerine-wallet-browser-3fefccd37219c9b4b513fc8d929723e07022b9c4.zip |
Merge branch 'master' into mascara-deploy
Diffstat (limited to 'app/scripts/lib/events-proxy.js')
-rw-r--r-- | app/scripts/lib/events-proxy.js | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/app/scripts/lib/events-proxy.js b/app/scripts/lib/events-proxy.js new file mode 100644 index 000000000..c0a490b05 --- /dev/null +++ b/app/scripts/lib/events-proxy.js @@ -0,0 +1,31 @@ +module.exports = function createEventEmitterProxy (eventEmitter, listeners) { + let target = eventEmitter + const eventHandlers = listeners || {} + const proxy = new Proxy({}, { + get: (obj, name) => { + // intercept listeners + if (name === 'on') return addListener + if (name === 'setTarget') return setTarget + if (name === 'proxyEventHandlers') return eventHandlers + return target[name] + }, + set: (obj, name, value) => { + target[name] = value + return true + }, + }) + function setTarget (eventEmitter) { + target = eventEmitter + // migrate listeners + Object.keys(eventHandlers).forEach((name) => { + eventHandlers[name].forEach((handler) => target.on(name, handler)) + }) + } + function addListener (name, handler) { + if (!eventHandlers[name]) eventHandlers[name] = [] + eventHandlers[name].push(handler) + target.on(name, handler) + } + if (listeners) proxy.setTarget(eventEmitter) + return proxy +} |