discourse/vendor/assets/javascripts/buffered-proxy.js

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(function (global) {
"use strict";
function empty(obj) {
var key;
for (key in obj) if (obj.hasOwnProperty(key)) return false;
return true;
}
var Ember = global.Ember,
get = Ember.get, set = Ember.set;
var BufferedProxy = Ember.Mixin.create({
buffer: null,
hasBufferedChanges: false,
unknownProperty: function (key) {
var buffer = this.buffer;
return buffer && buffer.hasOwnProperty(key) ? buffer[key] : this._super(key);
},
setUnknownProperty: function (key, value) {
if (!this.buffer) this.buffer = {};
var buffer = this.buffer,
content = this.get('content'),
current = content && get(content, key),
previous = buffer.hasOwnProperty(key) ? buffer[key] : current;
if (previous === value) return;
this.propertyWillChange(key);
if (current === value) {
delete buffer[key];
if (empty(buffer)) {
this.set('hasBufferedChanges', false);
}
} else {
buffer[key] = value;
this.set('hasBufferedChanges', true);
}
this.propertyDidChange(key);
return value;
},
applyBufferedChanges: function() {
var buffer = this.buffer,
content = this.get('content'),
key;
for (key in buffer) {
if (!buffer.hasOwnProperty(key)) continue;
set(content, key, buffer[key]);
}
this.buffer = {};
this.set('hasBufferedChanges', false);
},
discardBufferedChanges: function() {
var buffer = this.buffer,
content = this.get('content'),
key;
for (key in buffer) {
if (!buffer.hasOwnProperty(key)) continue;
this.propertyWillChange(key);
delete buffer[key];
this.propertyDidChange(key);
}
this.set('hasBufferedChanges', false);
}
});
// CommonJS module
if (typeof module !== 'undefined' && module.exports) {
module.exports = BufferedProxy;
} else if (typeof define === "function" && define.amd) {
define("buffered-proxy", function (require, exports, module) {
return BufferedProxy;
});
} else {
global.BufferedProxy = BufferedProxy;
}
}(this));