177 lines
No EOL
5.5 KiB
JavaScript
177 lines
No EOL
5.5 KiB
JavaScript
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(function() {
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'use strict';
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Elm.fullscreen = function(module) {
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var style = document.createElement('style');
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style.type = 'text/css';
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style.innerHTML = "html,head,body { padding:0; margin:0; }" +
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"body { font-family: calibri, helvetica, arial, sans-serif; }";
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document.head.appendChild(style);
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var container = document.createElement('div');
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document.body.appendChild(container);
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return init(ElmRuntime.Display.FULLSCREEN, container, module);
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};
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Elm.embed = function(module, container) {
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var tag = container.tagName;
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if (tag !== 'DIV') {
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throw new Error('Elm.node must be given a DIV, not a ' + tag + '.');
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} else if (container.hasChildNodes()) {
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throw new Error('Elm.node must be given an empty DIV. No children allowed!');
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}
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return init(ElmRuntime.Display.COMPONENT, container, module);
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};
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Elm.worker = function(module) {
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return init(ElmRuntime.Display.NONE, {}, module);
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};
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function init(display, container, module, moduleToReplace) {
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// defining state needed for an instance of the Elm RTS
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var inputs = [];
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function notify(id, v) {
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var timestep = Date.now();
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var changed = false;
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for (var i = inputs.length; i--; ) {
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// order is important here to avoid short-circuiting
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changed = inputs[i].recv(timestep, id, v) || changed;
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}
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return changed;
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}
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var listeners = [];
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function addListener(relevantInputs, domNode, eventName, func) {
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domNode.addEventListener(eventName, func);
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var listener = {
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relevantInputs: relevantInputs,
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domNode: domNode,
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eventName: eventName,
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func: func
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};
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listeners.push(listener);
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}
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// create the actual RTS. Any impure modules will attach themselves to this
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// object. This permits many Elm programs to be embedded per document.
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var elm = {
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notify:notify,
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node:container,
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display:display,
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id:ElmRuntime.guid(),
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addListener:addListener,
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inputs:inputs
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};
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// Set up methods to communicate with Elm program from JS.
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function send(name, value) {
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if (typeof value === 'undefined') return function(v) { return send(name,v); };
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var e = document.createEvent('Event');
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e.initEvent(name + '_' + elm.id, true, true);
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e.value = value;
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document.dispatchEvent(e);
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}
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function recv(name, handler) {
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document.addEventListener(name + '_' + elm.id, handler);
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}
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recv('log', function(e) {console.log(e.value)});
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recv('title', function(e) {document.title = e.value});
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recv('redirect', function(e) {
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if (e.value.length > 0) { window.location = e.value; }
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});
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function swap(newModule) {
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removeListeners(listeners);
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var div = document.createElement('div');
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var newElm = init(display, div, newModule, elm);
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inputs = [];
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// elm.send = newElm.send;
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// elm.recv = newElm.recv;
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// elm.swap = newElm.swap;
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return newElm;
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}
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var Module = {};
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var reportAnyErrors = function() {};
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try {
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Module = module.make(elm);
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} catch(e) {
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var directions = "<br/> Open the developer console for more details."
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Module.main = Elm.Text.make(elm).text('<code>' + e.message + directions + '</code>');
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reportAnyErrors = function() { throw e; }
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}
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inputs = ElmRuntime.filterDeadInputs(inputs);
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filterListeners(inputs, listeners);
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if (display !== ElmRuntime.Display.NONE) {
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var graphicsNode = initGraphics(elm, Module);
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}
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if (typeof moduleToReplace !== 'undefined') {
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ElmRuntime.swap(moduleToReplace, elm);
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// rerender scene if graphics are enabled.
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if (typeof graphicsNode !== 'undefined') {
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graphicsNode.recv(0, true, 0);
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}
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}
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reportAnyErrors();
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return { send:send, recv:recv, swap:swap };
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};
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function filterListeners(inputs, listeners) {
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loop:
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for (var i = listeners.length; i--; ) {
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var listener = listeners[i];
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for (var j = inputs.length; j--; ) {
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if (listener.relevantInputs.indexOf(inputs[j].id) >= 0) {
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continue loop;
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}
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}
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listener.domNode.removeEventListener(listener.eventName, listener.func);
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}
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}
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function removeListeners(listeners) {
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for (var i = listeners.length; i--; ) {
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var listener = listeners[i];
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listener.domNode.removeEventListener(listener.eventName, listener.func);
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}
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}
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function initGraphics(elm, Module) {
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if (!('main' in Module))
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throw new Error("'main' is missing! What do I display?!");
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var signalGraph = Module.main;
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// make sure the signal graph is actually a signal & extract the visual model
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var Signal = Elm.Signal.make(elm);
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if (!('recv' in signalGraph)) {
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signalGraph = Signal.constant(signalGraph);
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}
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var currentScene = signalGraph.value;
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// Add the currentScene to the DOM
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var Render = ElmRuntime.use(ElmRuntime.Render.Element);
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elm.node.appendChild(Render.render(currentScene));
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// set up updates so that the DOM is adjusted as necessary.
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function domUpdate(newScene, currentScene) {
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ElmRuntime.draw(function(_) {
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Render.update(elm.node.firstChild, currentScene, newScene);
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if (elm.Native.Window) elm.Native.Window.values.resizeIfNeeded();
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});
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return newScene;
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}
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var renderer = A3(Signal.foldp, F2(domUpdate), currentScene, signalGraph);
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// must check for resize after 'renderer' is created so
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// that changes show up.
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if (elm.Native.Window) elm.Native.Window.values.resizeIfNeeded();
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return renderer;
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}
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}()); |