121 lines
3.9 KiB
JavaScript
121 lines
3.9 KiB
JavaScript
// DOM fragment display driver
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var Patch = require("./patch.js");
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var DemandMatcher = require('./demand-matcher.js').DemandMatcher;
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var Struct = require('./struct.js');
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var Ack = require('./ack.js').Ack;
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var Dataspace_ = require("./dataspace.js");
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var Dataspace = Dataspace_.Dataspace;
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var __ = Dataspace_.__;
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var _$ = Dataspace_._$;
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var DOM = Struct.makeConstructor('DOM', ['selector', 'fragmentClass', 'fragmentSpec']);
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function spawnDOMDriver(domWrapFunction, jQueryWrapFunction) {
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domWrapFunction = domWrapFunction || DOM;
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var spec = domWrapFunction(_$('selector'), _$('fragmentClass'), _$('fragmentSpec'));
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Dataspace.spawn(
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new DemandMatcher([spec],
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[Patch.advertise(spec)],
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{
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onDemandIncrease: function (c) {
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Dataspace.spawn(new DOMFragment(c.selector,
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c.fragmentClass,
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c.fragmentSpec,
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domWrapFunction,
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jQueryWrapFunction));
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}
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}));
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}
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function DOMFragment(selector, fragmentClass, fragmentSpec, domWrapFunction, jQueryWrapFunction) {
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this.selector = selector;
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this.fragmentClass = fragmentClass;
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this.fragmentSpec = fragmentSpec;
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this.domWrapFunction = domWrapFunction;
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this.jQueryWrapFunction = jQueryWrapFunction;
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this.demandExists = false;
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this.subscriptionEstablished = new Ack();
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this.nodes = this.buildNodes();
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}
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DOMFragment.prototype.boot = function () {
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var self = this;
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var specification = self.domWrapFunction(self.selector, self.fragmentClass, self.fragmentSpec);
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Dataspace.spawn(new Dataspace(function () {
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Syndicate.JQuery.spawnJQueryDriver(self.selector+" > ."+self.fragmentClass,
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1,
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self.jQueryWrapFunction);
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Dataspace.spawn({
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demandExists: false,
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subscriptionEstablished: new Ack(1),
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boot: function () {
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this.subscriptionEstablished.arm();
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return Patch.sub(Patch.advertise(specification), 1);
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},
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handleEvent: function (e) {
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this.subscriptionEstablished.check(e);
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if (e.type === "stateChange") {
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if (e.patch.hasAdded()) this.demandExists = true;
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if (e.patch.hasRemoved()) this.demandExists = false;
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}
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if (this.subscriptionEstablished.done && !this.demandExists) {
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Dataspace.exitDataspace();
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}
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}
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});
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}));
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this.subscriptionEstablished.arm();
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return Patch.sub(specification).andThen(Patch.pub(specification));
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};
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DOMFragment.prototype.handleEvent = function (e) {
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this.subscriptionEstablished.check(e);
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if (e.type === "stateChange") {
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if (e.patch.hasAdded()) this.demandExists = true;
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if (e.patch.hasRemoved()) this.demandExists = false;
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}
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if (this.subscriptionEstablished.done && !this.demandExists) {
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for (var i = 0; i < this.nodes.length; i++) {
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var n = this.nodes[i];
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n.parentNode.removeChild(n);
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}
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Dataspace.exit();
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}
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};
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///////////////////////////////////////////////////////////////////////////
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DOMFragment.prototype.buildNodes = function () {
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var self = this;
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var nodes = [];
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$(self.selector).each(function (index, domNode) {
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if (typeof self.fragmentSpec !== 'string') {
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throw new Error("DOM fragmentSpec not a string: " + JSON.stringify(self.fragmentSpec));
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}
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var newNodes = $('<div>' + self.fragmentSpec + '</div>')[0].childNodes;
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// This next loop looks SUPER SUSPICIOUS. What is happening is
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// that each time we call domNode.appendChild(n), where n is an
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// element of the NodeList newNodes, the DOM is **removing** n
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// from the NodeList in order to place it in its new parent. So,
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// each call to appendChild shrinks the NodeList by one node until
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// it is finally empty, and its length property yields zero.
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while (newNodes.length) {
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var n = newNodes[0];
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if ('classList' in n) {
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n.classList.add(self.fragmentClass);
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}
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domNode.appendChild(n);
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nodes.push(n);
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}
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});
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return nodes;
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};
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///////////////////////////////////////////////////////////////////////////
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module.exports.spawnDOMDriver = spawnDOMDriver;
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module.exports.DOM = DOM;
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