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| System.register([], function (_export) {
"use strict";
var noMutations, ChildObserver, ChildObserverBinder;
function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
return {
setters: [],
execute: function () {
noMutations = [];
ChildObserver = (function () {
function ChildObserver(property, changeHandler, selector) {
_classCallCheck(this, ChildObserver);
this.selector = selector;
this.changeHandler = changeHandler;
this.property = property;
}
ChildObserver.prototype.createBinding = function createBinding(target, behavior) {
return new ChildObserverBinder(this.selector, target, this.property, behavior, this.changeHandler);
};
return ChildObserver;
})();
_export("ChildObserver", ChildObserver);
ChildObserverBinder = (function () {
function ChildObserverBinder(selector, target, property, behavior, changeHandler) {
_classCallCheck(this, ChildObserverBinder);
this.selector = selector;
this.target = target;
this.property = property;
this.behavior = behavior;
this.changeHandler = changeHandler;
this.observer = new MutationObserver(this.onChange.bind(this));
}
ChildObserverBinder.prototype.bind = function bind(source) {
var items,
results,
i,
ii,
node,
behavior = this.behavior;
this.observer.observe(this.target, { childList: true, subtree: true });
items = behavior[this.property];
if (!items) {
items = behavior[this.property] = [];
} else {
items.length = 0;
}
results = this.target.querySelectorAll(this.selector);
for (i = 0, ii = results.length; i < ii; ++i) {
node = results[i];
items.push(node.primaryBehavior ? node.primaryBehavior.executionContext : node);
}
if (this.changeHandler) {
this.behavior[this.changeHandler](noMutations);
}
};
ChildObserverBinder.prototype.unbind = function unbind() {
this.observer.disconnect();
};
ChildObserverBinder.prototype.onChange = function onChange(mutations) {
var items = this.behavior[this.property],
selector = this.selector;
mutations.forEach(function (record) {
var added = record.addedNodes,
removed = record.removedNodes,
prev = record.previousSibling,
i,
ii,
primary,
index,
node;
for (i = 0, ii = removed.length; i < ii; ++i) {
node = removed[i];
if (node.nodeType === 1 && node.matches(selector)) {
primary = node.primaryBehavior ? node.primaryBehavior.executionContext : node;
index = items.indexOf(primary);
if (index != -1) {
items.splice(index, 1);
}
}
}
for (i = 0, ii = added.length; i < ii; ++i) {
node = added[i];
if (node.nodeType === 1 && node.matches(selector)) {
primary = node.primaryBehavior ? node.primaryBehavior.executionContext : node;
index = 0;
while (prev) {
if (prev.nodeType === 1 && prev.matches(selector)) {
index++;
}
prev = prev.previousSibling;
}
items.splice(index, 0, primary);
}
}
});
if (this.changeHandler) {
this.behavior[this.changeHandler](mutations);
}
};
return ChildObserverBinder;
})();
_export("ChildObserverBinder", ChildObserverBinder);
}
};
});
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