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YUI.add('plugin', function (Y, NAME) {
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/**
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* Provides the base Plugin class, which plugin developers should extend, when creating custom plugins
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*
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* @module plugin
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*/
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/**
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* The base class for all Plugin instances.
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*
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* @class Plugin.Base
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* @extends Base
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* @param {Object} config Configuration object with property name/value pairs.
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*/
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function Plugin(config) {
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if (! (this.hasImpl && this.hasImpl(Y.Plugin.Base)) ) {
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Plugin.superclass.constructor.apply(this, arguments);
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} else {
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Plugin.prototype.initializer.apply(this, arguments);
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}
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}
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/**
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* Object defining the set of attributes supported by the Plugin.Base class
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*
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* @property ATTRS
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* @type Object
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* @static
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*/
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Plugin.ATTRS = {
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/**
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* The plugin's host object.
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*
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* @attribute host
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* @writeonce
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* @type Plugin.Host
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*/
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host : {
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writeOnce: true
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}
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};
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/**
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* The string identifying the Plugin.Base class. Plugins extending
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* Plugin.Base should set their own NAME value.
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*
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* @property NAME
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* @type String
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* @static
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*/
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Plugin.NAME = 'plugin';
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/**
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* The name of the property the the plugin will be attached to
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* when plugged into a Plugin Host. Plugins extending Plugin.Base,
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* should set their own NS value.
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*
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* @property NS
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* @type String
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* @static
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*/
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Plugin.NS = 'plugin';
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Y.extend(Plugin, Y.Base, {
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/**
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* The list of event handles for event listeners or AOP injected methods
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* applied by the plugin to the host object.
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*
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* @property _handles
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* @private
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* @type Array
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* @value null
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*/
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_handles: null,
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/**
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* Initializer lifecycle implementation.
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*
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* @method initializer
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* @param {Object} config Configuration object with property name/value pairs.
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*/
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initializer : function(config) {
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if (!this.get("host")) { Y.log('No host defined for plugin ' + this, 'warn', 'Plugin');}
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this._handles = [];
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Y.log('Initializing: ' + this.constructor.NAME, 'info', 'Plugin');
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},
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/**
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* Destructor lifecycle implementation.
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*
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* Removes any event listeners or injected methods applied by the Plugin
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*
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* @method destructor
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*/
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destructor: function() {
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// remove all handles
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if (this._handles) {
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for (var i = 0, l = this._handles.length; i < l; i++) {
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this._handles[i].detach();
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}
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}
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},
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/**
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* Listens for the "on" moment of events fired by the host,
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* or injects code "before" a given method on the host.
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*
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* @method doBefore
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*
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* @param strMethod {String} The event to listen for, or method to inject logic before.
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* @param fn {Function} The handler function. For events, the "on" moment listener. For methods, the function to execute before the given method is executed.
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* @param context {Object} An optional context to call the handler with. The default context is the plugin instance.
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* @return handle {EventHandle} The detach handle for the handler.
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*/
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doBefore: function(strMethod, fn, context) {
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var host = this.get("host"), handle;
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if (strMethod in host) { // method
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handle = this.beforeHostMethod(strMethod, fn, context);
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} else if (host.on) { // event
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handle = this.onHostEvent(strMethod, fn, context);
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}
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return handle;
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},
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/**
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* Listens for the "after" moment of events fired by the host,
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* or injects code "after" a given method on the host.
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*
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* @method doAfter
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*
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* @param strMethod {String} The event to listen for, or method to inject logic after.
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* @param fn {Function} The handler function. For events, the "after" moment listener. For methods, the function to execute after the given method is executed.
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* @param context {Object} An optional context to call the handler with. The default context is the plugin instance.
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* @return handle {EventHandle} The detach handle for the listener.
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*/
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doAfter: function(strMethod, fn, context) {
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var host = this.get("host"), handle;
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if (strMethod in host) { // method
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handle = this.afterHostMethod(strMethod, fn, context);
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} else if (host.after) { // event
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handle = this.afterHostEvent(strMethod, fn, context);
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}
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return handle;
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},
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/**
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* Listens for the "on" moment of events fired by the host object.
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*
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* Listeners attached through this method will be detached when the plugin is unplugged.
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*
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* @method onHostEvent
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* @param {String | Object} type The event type.
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* @param {Function} fn The listener.
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* @param {Object} context The execution context. Defaults to the plugin instance.
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* @return handle {EventHandle} The detach handle for the listener.
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*/
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onHostEvent : function(type, fn, context) {
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var handle = this.get("host").on(type, fn, context || this);
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this._handles.push(handle);
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return handle;
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},
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/**
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* Listens for the "on" moment of events fired by the host object one time only.
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* The listener is immediately detached when it is executed.
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*
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* Listeners attached through this method will be detached when the plugin is unplugged.
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*
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* @method onceHostEvent
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* @param {String | Object} type The event type.
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* @param {Function} fn The listener.
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* @param {Object} context The execution context. Defaults to the plugin instance.
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* @return handle {EventHandle} The detach handle for the listener.
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*/
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onceHostEvent : function(type, fn, context) {
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var handle = this.get("host").once(type, fn, context || this);
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this._handles.push(handle);
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return handle;
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},
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/**
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* Listens for the "after" moment of events fired by the host object.
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*
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* Listeners attached through this method will be detached when the plugin is unplugged.
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*
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* @method afterHostEvent
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* @param {String | Object} type The event type.
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* @param {Function} fn The listener.
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* @param {Object} context The execution context. Defaults to the plugin instance.
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* @return handle {EventHandle} The detach handle for the listener.
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*/
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afterHostEvent : function(type, fn, context) {
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var handle = this.get("host").after(type, fn, context || this);
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this._handles.push(handle);
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return handle;
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},
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/**
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* Listens for the "after" moment of events fired by the host object one time only.
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* The listener is immediately detached when it is executed.
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*
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* Listeners attached through this method will be detached when the plugin is unplugged.
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*
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* @method onceAfterHostEvent
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* @param {String | Object} type The event type.
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* @param {Function} fn The listener.
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* @param {Object} context The execution context. Defaults to the plugin instance.
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* @return handle {EventHandle} The detach handle for the listener.
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*/
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onceAfterHostEvent : function(type, fn, context) {
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var handle = this.get("host").onceAfter(type, fn, context || this);
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this._handles.push(handle);
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return handle;
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},
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/**
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* Injects a function to be executed before a given method on host object.
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*
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* The function will be detached when the plugin is unplugged.
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*
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* @method beforeHostMethod
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* @param {String} method The name of the method to inject the function before.
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* @param {Function} fn The function to inject.
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* @param {Object} context The execution context. Defaults to the plugin instance.
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* @return handle {EventHandle} The detach handle for the injected function.
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*/
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beforeHostMethod : function(strMethod, fn, context) {
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var handle = Y.Do.before(fn, this.get("host"), strMethod, context || this);
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this._handles.push(handle);
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return handle;
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},
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/**
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* Injects a function to be executed after a given method on host object.
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*
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* The function will be detached when the plugin is unplugged.
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*
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* @method afterHostMethod
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* @param {String} method The name of the method to inject the function after.
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* @param {Function} fn The function to inject.
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* @param {Object} context The execution context. Defaults to the plugin instance.
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* @return handle {EventHandle} The detach handle for the injected function.
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*/
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afterHostMethod : function(strMethod, fn, context) {
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var handle = Y.Do.after(fn, this.get("host"), strMethod, context || this);
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this._handles.push(handle);
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return handle;
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},
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toString: function() {
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return this.constructor.NAME + '[' + this.constructor.NS + ']';
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}
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});
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Y.namespace("Plugin").Base = Plugin;
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}, '3.18.1', {"requires": ["base-base"]});
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