85 lines
No EOL
2.4 KiB
JavaScript
85 lines
No EOL
2.4 KiB
JavaScript
define([
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"util/text!config/commands.json",
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"util/dom2"
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], function(list) {
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try {
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list = JSON.parse(list);
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} catch (e) {
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console.error(e);
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list = [];
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}
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/*
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The command module is the heart of Caret's loosely-coupled modules. It
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serves as an event bus for inter-module communication, but it also listens
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to the DOM for click/change events and makes it easy to bind page interactions
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to command callbacks.
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Command is usually called as if synchronous, but it does support asynchronous
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operation--it will pass a callback in to any subscribers, but will also
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immediately pass back the return value (if any) from the those subscribers.
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*/
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var commands = {};
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//commands can pass a callback, although most don't respond that way
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var fire = function(command, argument, callback) {
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if (!commands[command]) return;
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var args = [].slice.call(arguments, 1);
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//technically, a function argument is a callback...
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if (typeof argument == "function") {
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callback = argument;
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}
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var registry = commands[command].slice();
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registry.forEach(function(entry) {
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var result = entry.callback.apply(null, args);
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//immediately call back if sync-style return value was provided
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if (typeof result !== "undefined" && callback) {
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callback.call(null, result);
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}
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});
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}
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var register = function(command, listener) {
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if (!commands[command]) {
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commands[command] = [];
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}
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commands[command].push({
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callback: listener
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});
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}
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//delegate for all elements that have a command attribute
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//may want to add more listeners for other UI elements (select)
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document.body.on("click", function(e) {
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//cancel on inputs, selectboxes
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if (["input", "select"].indexOf(e.target.tagName.toLowerCase()) >= 0) return;
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//delegate all items with a command attribute
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if (e.target.hasAttribute("command")) {
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var command = e.target.getAttribute("command");
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var arg = e.target.getAttribute("argument");
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fire(command, arg);
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e.preventDefault();
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}
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});
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document.body.on("change", function(e) {
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if (e.target.hasAttribute("command")) {
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var command = e.target.getAttribute("command");
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var arg = e.target.value;
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fire(command, arg);
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}
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});
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var facade = {
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fire: fire,
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on: register,
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list: list
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};
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return facade;
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}); |