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document.js
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document.js
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'use strict';
var getDocument = require('can-globals/document/document');
var domDataState = require("can-dom-data-state");
var getMutationObserver = require("can-globals/mutation-observer/mutation-observer");
var each = require("../../../js/each/each");
var CIDStore = require("../../../js/cid-set/cid-set");
var makeArray = require("../../../js/make-array/make-array");
var string = require("../../../js/string/string");
var dispatchIfListening = function(mutatedNode, nodes, dispatched){
if(dispatched.has(mutatedNode)) {
return true;
}
dispatched.add(mutatedNode);
if(nodes.name === "removedNodes") {
var documentElement = getDocument().documentElement;
if(documentElement.contains(mutatedNode)) {
return;
}
}
nodes.handlers.forEach(function(handler){
handler(mutatedNode);
});
nodes.afterHandlers.forEach(function(handler){
handler(mutatedNode);
});
};
var mutationObserverDocument = {
add: function(handler) {
var MO = getMutationObserver();
if (MO) {
var documentElement = getDocument().documentElement;
var globalObserverData = domDataState.get.call(documentElement, "globalObserverData");
if(!globalObserverData) {
var observer = new MO(function (mutations) {
globalObserverData.handlers.forEach(function(handler){
handler(mutations);
});
});
observer.observe(documentElement, {childList: true, subtree: true});
globalObserverData = {
observer: observer,
handlers: []
};
domDataState.set.call(documentElement, "globalObserverData", globalObserverData);
}
globalObserverData.handlers.push(handler);
}
},
remove: function(handler){
var documentElement = getDocument().documentElement;
var globalObserverData = domDataState.get.call(documentElement, "globalObserverData");
if(globalObserverData) {
var index = globalObserverData.handlers.indexOf(handler);
if(index >= 0) {
globalObserverData.handlers.splice(index, 1);
}
if(globalObserverData.handlers.length === 0 ){
globalObserverData.observer.disconnect();
domDataState.clean.call(documentElement, "globalObserverData");
}
}
}
};
var makeMutationMethods = function(name) {
var mutationName = name.toLowerCase() + "Nodes";
var getMutationData = function() {
var documentElement = getDocument().documentElement;
var mutationData = domDataState.get.call(documentElement, mutationName + "MutationData");
if(!mutationData) {
mutationData = {
name: mutationName,
handlers: [],
afterHandlers: [],
hander: null
};
if (getMutationObserver()) {
domDataState.set.call(documentElement, mutationName + "MutationData", mutationData);
}
}
return mutationData;
};
var setup = function() {
var mutationData = getMutationData();
if( mutationData.handlers.length === 0 || mutationData.afterHandlers.length === 0 ) {
mutationData.handler = function(mutations){
var dispatched = new CIDStore();
mutations.forEach(function(mutation){
each(mutation[mutationName], function(mutatedNode){
var children = mutatedNode.getElementsByTagName && makeArray( mutatedNode.getElementsByTagName("*") );
var alreadyChecked = dispatchIfListening(mutatedNode, mutationData, dispatched);
if(children && !alreadyChecked) {
for (var j = 0, child;
(child = children[j]) !== undefined; j++) {
dispatchIfListening(child, mutationData, dispatched);
}
}
});
});
};
this.add(mutationData.handler);
}
return mutationData;
};
var teardown = function() {
var documentElement = getDocument().documentElement;
var mutationData = getMutationData();
if( mutationData.handlers.length === 0 && mutationData.afterHandlers.length === 0 ) {
this.remove(mutationData.handler);
domDataState.clean.call(documentElement, mutationName + "MutationData");
}
};
var createOnOffHandlers = function(name, handlerList) {
mutationObserverDocument["on" + name] = function(handler) {
var mutationData = setup.call(this);
mutationData[handlerList].push(handler);
};
mutationObserverDocument["off" + name] = function(handler) {
var mutationData = getMutationData();
var index = mutationData[handlerList].indexOf(handler);
if(index >=0 ) {
mutationData[handlerList].splice(index, 1);
}
teardown.call(this);
};
};
var createHandlers = function(name) {
createOnOffHandlers(name, "handlers");
createOnOffHandlers("After" + name, "afterHandlers");
};
createHandlers(string.capitalize(mutationName));
};
makeMutationMethods("added");
makeMutationMethods("removed");
module.exports = mutationObserverDocument;