happstack-yui-7371.5.0: bundle/attribute-events/attribute-events-coverage.js
/*
YUI 3.7.1 (build 5627)
Copyright 2012 Yahoo! Inc. All rights reserved.
Licensed under the BSD License.
http://yuilibrary.com/license/
*/
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YUI.add('attribute-events', function (Y, NAME) {
/**
* The attribute module provides an augmentable Attribute implementation, which
* adds configurable attributes and attribute change events to the class being
* augmented. It also provides a State class, which is used internally by Attribute,
* but can also be used independently to provide a name/property/value data structure to
* store state.
*
* @module attribute
*/
/**
* The attribute-events submodule provides augmentable attribute change event support
* for AttributeCore based implementations.
*
* @module attribute
* @submodule attribute-events
*/
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var EventTarget = Y.EventTarget,
CHANGE = "Change",
BROADCAST = "broadcast",
PUBLISHED = "published";
/**
* Provides an augmentable implementation of attribute change events for
* AttributeCore.
*
* @class AttributeEvents
* @uses EventTarget
*/
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function AttributeEvents() {
// Perf tweak - avoid creating event literals if not required.
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this._ATTR_E_FACADE = {};
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EventTarget.call(this, {emitFacade:true});
}
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AttributeEvents._ATTR_CFG = [BROADCAST];
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AttributeEvents.prototype = {
/**
* Sets the value of an attribute.
*
* @method set
* @chainable
*
* @param {String} name The name of the attribute. If the
* current value of the attribute is an Object, dot notation can be used
* to set the value of a property within the object (e.g. <code>set("x.y.z", 5)</code>).
*
* @param {Any} value The value to set the attribute to.
*
* @param {Object} opts (Optional) Optional event data to be mixed into
* the event facade passed to subscribers of the attribute's change event. This
* can be used as a flexible way to identify the source of a call to set, allowing
* the developer to distinguish between set called internally by the host, vs.
* set called externally by the application developer.
*
* @return {Object} A reference to the host object.
*/
set : function(name, val, opts) {
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return this._setAttr(name, val, opts);
},
/**
* Allows setting of readOnly/writeOnce attributes. See <a href="#method_set">set</a> for argument details.
*
* @method _set
* @protected
* @chainable
*
* @param {String} name The name of the attribute.
* @param {Any} val The value to set the attribute to.
* @param {Object} opts (Optional) Optional event data to be mixed into
* the event facade passed to subscribers of the attribute's change event.
* @return {Object} A reference to the host object.
*/
_set : function(name, val, opts) {
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return this._setAttr(name, val, opts, true);
},
/**
* Sets multiple attribute values.
*
* @method setAttrs
* @param {Object} attrs An object with attributes name/value pairs.
* @param {Object} opts Properties to mix into the event payload. These are shared and mixed into each set
* @return {Object} A reference to the host object.
* @chainable
*/
setAttrs : function(attrs, opts) {
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return this._setAttrs(attrs, opts);
},
/**
* Implementation behind the public setAttrs method, to set multiple attribute values.
*
* @method _setAttrs
* @protected
* @param {Object} attrs An object with attributes name/value pairs.
* @param {Object} opts Properties to mix into the event payload. These are shared and mixed into each set
* @return {Object} A reference to the host object.
* @chainable
*/
_setAttrs : function(attrs, opts) {
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var attr;
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for (attr in attrs) {
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if ( attrs.hasOwnProperty(attr) ) {
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this.set(attr, attrs[attr], opts);
}
}
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return this;
},
/**
* Utility method to help setup the event payload and fire the attribute change event.
*
* @method _fireAttrChange
* @private
* @param {String} attrName The name of the attribute
* @param {String} subAttrName The full path of the property being changed,
* if this is a sub-attribute value being change. Otherwise null.
* @param {Any} currVal The current value of the attribute
* @param {Any} newVal The new value of the attribute
* @param {Object} opts Any additional event data to mix into the attribute change event's event facade.
*/
_fireAttrChange : function(attrName, subAttrName, currVal, newVal, opts) {
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var host = this,
eventName = attrName + CHANGE,
state = host._state,
facade,
broadcast,
evtCfg;
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if (!state.get(attrName, PUBLISHED)) {
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evtCfg = {
queuable:false,
defaultTargetOnly: true,
defaultFn:host._defAttrChangeFn,
silent:true
};
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broadcast = state.get(attrName, BROADCAST);
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if (broadcast !== undefined) {
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evtCfg.broadcast = broadcast;
}
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host.publish(eventName, evtCfg);
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state.add(attrName, PUBLISHED, true);
}
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facade = (opts) ? Y.merge(opts) : host._ATTR_E_FACADE;
// Not using the single object signature for fire({type:..., newVal:...}), since
// we don't want to override type. Changed to the fire(type, {newVal:...}) signature.
// facade.type = eventName;
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facade.attrName = attrName;
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facade.subAttrName = subAttrName;
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facade.prevVal = currVal;
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facade.newVal = newVal;
// host.fire(facade);
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host.fire(eventName, facade);
},
/**
* Default function for attribute change events.
*
* @private
* @method _defAttrChangeFn
* @param {EventFacade} e The event object for attribute change events.
*/
_defAttrChangeFn : function(e) {
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if (!this._setAttrVal(e.attrName, e.subAttrName, e.prevVal, e.newVal)) {
// Prevent "after" listeners from being invoked since nothing changed.
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e.stopImmediatePropagation();
} else {
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e.newVal = this.get(e.attrName);
}
}
};
// Basic prototype augment - no lazy constructor invocation.
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Y.mix(AttributeEvents, EventTarget, false, null, 1);
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Y.AttributeEvents = AttributeEvents;
}, '3.7.1', {"requires": ["event-custom"]});