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passing old value for stateful events

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This commit is contained in:
Val Erastov 2018-02-07 00:49:28 -08:00
parent 271b7dd84a
commit d6c5a56e5f
1 changed files with 5 additions and 2 deletions
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7
modules/bus/index.js
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@ -75,13 +75,16 @@ export default class Bus {
}
dispatch(key, data) {
// console.log('dispatch: ' + key + ' -> ' + JSON.stringify(data));
// console.log('dispatch: %c' + key, 'color: #0a0');
// console.log(data);
if (this.lock.has(key)) {
console.warn('recursive dispatch');
return
}
let oldValue;
if (this.keepStateFor.has(key)) {
oldValue = this.state[key];
this.state[key] = data;
}
this.lock.add(key);
@ -91,7 +94,7 @@ export default class Bus {
for (let i = 0; i < listenerList.length; i++) {
const callback = listenerList[i];
try {
callback(data);
callback(data, oldValue);
} catch(e) {
console.error(e);
}