343 lines
12 KiB
JavaScript
343 lines
12 KiB
JavaScript
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// ┌──────────────────────────────────────────────────────────────────────────────────────┐ \\
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// │ Eve 0.4.1 - JavaScript Events Library │ \\
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// ├──────────────────────────────────────────────────────────────────────────────────────┤ \\
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// │ Copyright (c) 2008-2012 Dmitry Baranovskiy (http://dmitry.baranovskiy.com/) │ \\
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// │ Licensed under the MIT (http://www.opensource.org/licenses/mit-license.php) license. │ \\
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// └──────────────────────────────────────────────────────────────────────────────────────┘ \\
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(function (glob) {
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var version = "0.4.1",
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has = "hasOwnProperty",
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separator = /[\.\/]/,
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wildcard = "*",
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fun = function () {},
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numsort = function (a, b) {
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return a - b;
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},
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current_event,
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stop,
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events = {n: {}},
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/*\
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* eve
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[ method ]
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* Fires event with given `name`, given scope and other parameters.
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> Arguments
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- name (string) name of the *event*, dot (`.`) or slash (`/`) separated
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- scope (object) context for the event handlers
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- varargs (...) the rest of arguments will be sent to event handlers
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= (object) array of returned values from the listeners
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\*/
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eve = function (name, scope) {
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var e = events,
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oldstop = stop,
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args = Array.prototype.slice.call(arguments, 2),
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listeners = eve.listeners(name),
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z = 0,
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f = false,
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l,
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indexed = [],
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queue = {},
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out = [],
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ce = current_event,
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errors = [];
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current_event = name;
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stop = 0;
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for (var i = 0, ii = listeners.length; i < ii; i++) if ("zIndex" in listeners[i]) {
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indexed.push(listeners[i].zIndex);
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if (listeners[i].zIndex < 0) {
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queue[listeners[i].zIndex] = listeners[i];
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}
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}
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indexed.sort(numsort);
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while (indexed[z] < 0) {
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l = queue[indexed[z++]];
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out.push(l.apply(scope, args));
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if (stop) {
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stop = oldstop;
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return out;
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}
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}
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for (i = 0; i < ii; i++) {
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l = listeners[i];
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if ("zIndex" in l) {
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if (l.zIndex == indexed[z]) {
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out.push(l.apply(scope, args));
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if (stop) {
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break;
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}
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do {
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z++;
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l = queue[indexed[z]];
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l && out.push(l.apply(scope, args));
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if (stop) {
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break;
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}
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} while (l)
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} else {
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queue[l.zIndex] = l;
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}
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} else {
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out.push(l.apply(scope, args));
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if (stop) {
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break;
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}
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}
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}
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stop = oldstop;
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current_event = ce;
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return out.length ? out : null;
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};
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// Undocumented. Debug only.
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eve._events = events;
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/*\
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* eve.listeners
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[ method ]
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* Internal method which gives you array of all event handlers that will be triggered by the given `name`.
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> Arguments
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- name (string) name of the event, dot (`.`) or slash (`/`) separated
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= (array) array of event handlers
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\*/
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eve.listeners = function (name) {
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var names = name.split(separator),
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e = events,
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item,
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items,
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k,
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i,
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ii,
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j,
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jj,
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nes,
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es = [e],
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out = [];
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for (i = 0, ii = names.length; i < ii; i++) {
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nes = [];
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for (j = 0, jj = es.length; j < jj; j++) {
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e = es[j].n;
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items = [e[names[i]], e[wildcard]];
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k = 2;
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while (k--) {
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item = items[k];
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if (item) {
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nes.push(item);
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out = out.concat(item.f || []);
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}
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}
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}
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es = nes;
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}
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return out;
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};
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/*\
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* eve.on
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[ method ]
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**
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* Binds given event handler with a given name. You can use wildcards “`*`” for the names:
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| eve.on("*.under.*", f);
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| eve("mouse.under.floor"); // triggers f
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* Use @eve to trigger the listener.
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**
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> Arguments
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**
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- name (string) name of the event, dot (`.`) or slash (`/`) separated, with optional wildcards
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- f (function) event handler function
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**
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= (function) returned function accepts a single numeric parameter that represents z-index of the handler. It is an optional feature and only used when you need to ensure that some subset of handlers will be invoked in a given order, despite of the order of assignment.
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> Example:
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| eve.on("mouse", eatIt)(2);
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| eve.on("mouse", scream);
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| eve.on("mouse", catchIt)(1);
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* This will ensure that `catchIt()` function will be called before `eatIt()`.
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*
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* If you want to put your handler before non-indexed handlers, specify a negative value.
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* Note: I assume most of the time you don’t need to worry about z-index, but it’s nice to have this feature “just in case”.
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\*/
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eve.on = function (name, f) {
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var names = name.split(separator),
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e = events;
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for (var i = 0, ii = names.length; i < ii; i++) {
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e = e.n;
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e = e.hasOwnProperty(names[i]) && e[names[i]] || (e[names[i]] = {n: {}});
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}
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e.f = e.f || [];
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for (i = 0, ii = e.f.length; i < ii; i++) if (e.f[i] == f) {
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return fun;
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}
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e.f.push(f);
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return function (zIndex) {
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if (+zIndex == +zIndex) {
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f.zIndex = +zIndex;
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}
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};
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};
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/*\
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* eve.f
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[ method ]
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**
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* Returns function that will fire given event with optional arguments.
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* Arguments that will be passed to the result function will be also
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* concated to the list of final arguments.
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| el.onclick = eve.f("click", 1, 2);
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| eve.on("click", function (a, b, c) {
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| console.log(a, b, c); // 1, 2, [event object]
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| });
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> Arguments
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- event (string) event name
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- varargs (…) and any other arguments
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= (function) possible event handler function
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\*/
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eve.f = function (event) {
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var attrs = [].slice.call(arguments, 1);
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return function () {
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eve.apply(null, [event, null].concat(attrs).concat([].slice.call(arguments, 0)));
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};
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};
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/*\
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* eve.stop
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[ method ]
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**
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* Is used inside an event handler to stop the event, preventing any subsequent listeners from firing.
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\*/
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eve.stop = function () {
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stop = 1;
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};
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/*\
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* eve.nt
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[ method ]
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**
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* Could be used inside event handler to figure out actual name of the event.
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**
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> Arguments
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**
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- subname (string) #optional subname of the event
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**
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= (string) name of the event, if `subname` is not specified
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* or
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= (boolean) `true`, if current event’s name contains `subname`
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\*/
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eve.nt = function (subname) {
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if (subname) {
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return new RegExp("(?:\\.|\\/|^)" + subname + "(?:\\.|\\/|$)").test(current_event);
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}
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return current_event;
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};
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/*\
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* eve.off
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[ method ]
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**
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* Removes given function from the list of event listeners assigned to given name.
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* If no arguments specified all the events will be cleared.
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**
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> Arguments
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**
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- name (string) name of the event, dot (`.`) or slash (`/`) separated, with optional wildcards
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- f (function) event handler function
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\*/
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/*\
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* eve.unbind
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[ method ]
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**
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* See @eve.off
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\*/
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eve.off = eve.unbind = function (name, f) {
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if (!name) {
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eve._events = events = {n: {}};
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return;
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}
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var names = name.split(separator),
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e,
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key,
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splice,
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i, ii, j, jj,
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cur = [events];
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for (i = 0, ii = names.length; i < ii; i++) {
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for (j = 0; j < cur.length; j += splice.length - 2) {
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splice = [j, 1];
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e = cur[j].n;
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if (names[i] != wildcard) {
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if (e[names[i]]) {
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splice.push(e[names[i]]);
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}
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} else {
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for (key in e) if (e[has](key)) {
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splice.push(e[key]);
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}
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}
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cur.splice.apply(cur, splice);
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}
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}
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for (i = 0, ii = cur.length; i < ii; i++) {
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e = cur[i];
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while (e.n) {
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if (f) {
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if (e.f) {
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for (j = 0, jj = e.f.length; j < jj; j++) if (e.f[j] == f) {
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e.f.splice(j, 1);
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break;
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}
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!e.f.length && delete e.f;
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}
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for (key in e.n) if (e.n[has](key) && e.n[key].f) {
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var funcs = e.n[key].f;
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for (j = 0, jj = funcs.length; j < jj; j++) if (funcs[j] == f) {
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funcs.splice(j, 1);
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break;
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}
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!funcs.length && delete e.n[key].f;
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}
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} else {
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delete e.f;
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for (key in e.n) if (e.n[has](key) && e.n[key].f) {
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delete e.n[key].f;
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}
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}
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e = e.n;
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}
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}
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};
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/*\
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* eve.once
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[ method ]
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**
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* Binds given event handler with a given name to only run once then unbind itself.
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| eve.once("login", f);
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| eve("login"); // triggers f
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| eve("login"); // no listeners
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* Use @eve to trigger the listener.
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**
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> Arguments
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**
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- name (string) name of the event, dot (`.`) or slash (`/`) separated, with optional wildcards
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- f (function) event handler function
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**
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= (function) same return function as @eve.on
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\*/
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eve.once = function (name, f) {
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var f2 = function () {
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eve.unbind(name, f2);
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return f.apply(this, arguments);
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};
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return eve.on(name, f2);
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};
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/*\
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* eve.version
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[ property (string) ]
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**
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* Current version of the library.
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\*/
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eve.version = version;
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eve.toString = function () {
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return "You are running Eve " + version;
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};
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(typeof module != "undefined" && module.exports) ? (module.exports = eve) : (typeof define != "undefined" ? (define("eve", [], function() { return eve; })) : (glob.eve = eve));
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})(this);
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