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<pre class="prettyprint lang-js"><span id='Ext-Class'>/**
</span> * @author Jacky Nguyen <jacky@sencha.com>
* @docauthor Jacky Nguyen <jacky@sencha.com>
* @class Ext.Class
*
* Handles class creation throughout the framework. This is a low level factory that is used by Ext.ClassManager and generally
* should not be used directly. If you choose to use Ext.Class you will lose out on the namespace, aliasing and depency loading
* features made available by Ext.ClassManager. The only time you would use Ext.Class directly is to create an anonymous class.
*
* If you wish to create a class you should use {@link Ext#define Ext.define} which aliases
* {@link Ext.ClassManager#create Ext.ClassManager.create} to enable namespacing and dynamic dependency resolution.
*
* Ext.Class is the factory and **not** the superclass of everything. For the base class that **all** Ext classes inherit
* from, see {@link Ext.Base}.
*/
(function() {
var ExtClass,
Base = Ext.Base,
baseStaticMembers = [],
baseStaticMember, baseStaticMemberLength;
for (baseStaticMember in Base) {
if (Base.hasOwnProperty(baseStaticMember)) {
baseStaticMembers.push(baseStaticMember);
}
}
baseStaticMemberLength = baseStaticMembers.length;
// Creates a constructor that has nothing extra in its scope chain.
function makeCtor (className) {
function constructor () {
// Opera has some problems returning from a constructor when Dragonfly isn't running. The || null seems to
// be sufficient to stop it misbehaving. Known to be required against 10.53, 11.51 and 11.61.
return this.constructor.apply(this, arguments) || null;
}
//<debug>
if (className) {
constructor.displayName = className;
}
//</debug>
return constructor;
}
<span id='Ext-Class-method-constructor'> /**
</span> * @method constructor
* Create a new anonymous class.
*
* @param {Object} data An object represent the properties of this class
* @param {Function} onCreated Optional, the callback function to be executed when this class is fully created.
* Note that the creation process can be asynchronous depending on the pre-processors used.
*
* @return {Ext.Base} The newly created class
*/
Ext.Class = ExtClass = function(Class, data, onCreated) {
if (typeof Class != 'function') {
onCreated = data;
data = Class;
Class = null;
}
if (!data) {
data = {};
}
Class = ExtClass.create(Class, data);
ExtClass.process(Class, data, onCreated);
return Class;
};
Ext.apply(ExtClass, {
<span id='Ext-Class-method-onBeforeCreated'> /**
</span> * @private
* @param Class
* @param data
* @param hooks
*/
onBeforeCreated: function(Class, data, hooks) {
Class.addMembers(data);
hooks.onCreated.call(Class, Class);
},
<span id='Ext-Class-method-create'> /**
</span> * @private
* @param Class
* @param classData
* @param onClassCreated
*/
create: function(Class, data) {
var name, i;
if (!Class) {
Class = makeCtor(
//<debug>
data.$className
//</debug>
);
}
for (i = 0; i < baseStaticMemberLength; i++) {
name = baseStaticMembers[i];
Class[name] = Base[name];
}
return Class;
},
<span id='Ext-Class-method-process'> /**
</span> * @private
* @param Class
* @param data
* @param onCreated
*/
process: function(Class, data, onCreated) {
var preprocessorStack = data.preprocessors || ExtClass.defaultPreprocessors,
registeredPreprocessors = this.preprocessors,
hooks = {
onBeforeCreated: this.onBeforeCreated
},
preprocessors = [],
preprocessor, preprocessorsProperties,
i, ln, j, subLn, preprocessorProperty, process;
delete data.preprocessors;
for (i = 0,ln = preprocessorStack.length; i < ln; i++) {
preprocessor = preprocessorStack[i];
if (typeof preprocessor == 'string') {
preprocessor = registeredPreprocessors[preprocessor];
preprocessorsProperties = preprocessor.properties;
if (preprocessorsProperties === true) {
preprocessors.push(preprocessor.fn);
}
else if (preprocessorsProperties) {
for (j = 0,subLn = preprocessorsProperties.length; j < subLn; j++) {
preprocessorProperty = preprocessorsProperties[j];
if (data.hasOwnProperty(preprocessorProperty)) {
preprocessors.push(preprocessor.fn);
break;
}
}
}
}
else {
preprocessors.push(preprocessor);
}
}
hooks.onCreated = onCreated ? onCreated : Ext.emptyFn;
hooks.preprocessors = preprocessors;
this.doProcess(Class, data, hooks);
},
doProcess: function(Class, data, hooks){
var me = this,
preprocessor = hooks.preprocessors.shift();
if (!preprocessor) {
hooks.onBeforeCreated.apply(me, arguments);
return;
}
if (preprocessor.call(me, Class, data, hooks, me.doProcess) !== false) {
me.doProcess(Class, data, hooks);
}
},
<span id='Ext-Class-property-preprocessors'> /** @private */
</span> preprocessors: {},
<span id='Ext-Class-static-method-registerPreprocessor'> /**
</span> * Register a new pre-processor to be used during the class creation process
*
* @param {String} name The pre-processor's name
* @param {Function} fn The callback function to be executed. Typical format:
*
* function(cls, data, fn) {
* // Your code here
*
* // Execute this when the processing is finished.
* // Asynchronous processing is perfectly ok
* if (fn) {
* fn.call(this, cls, data);
* }
* });
*
* @param {Function} fn.cls The created class
* @param {Object} fn.data The set of properties passed in {@link Ext.Class} constructor
* @param {Function} fn.fn The callback function that **must** to be executed when this
* pre-processor finishes, regardless of whether the processing is synchronous or aynchronous.
* @return {Ext.Class} this
* @private
* @static
*/
registerPreprocessor: function(name, fn, properties, position, relativeTo) {
if (!position) {
position = 'last';
}
if (!properties) {
properties = [name];
}
this.preprocessors[name] = {
name: name,
properties: properties || false,
fn: fn
};
this.setDefaultPreprocessorPosition(name, position, relativeTo);
return this;
},
<span id='Ext-Class-static-method-getPreprocessor'> /**
</span> * Retrieve a pre-processor callback function by its name, which has been registered before
*
* @param {String} name
* @return {Function} preprocessor
* @private
* @static
*/
getPreprocessor: function(name) {
return this.preprocessors[name];
},
<span id='Ext-Class-method-getPreprocessors'> /**
</span> * @private
*/
getPreprocessors: function() {
return this.preprocessors;
},
<span id='Ext-Class-property-defaultPreprocessors'> /**
</span> * @private
*/
defaultPreprocessors: [],
<span id='Ext-Class-static-method-getDefaultPreprocessors'> /**
</span> * Retrieve the array stack of default pre-processors
* @return {Function[]} defaultPreprocessors
* @private
* @static
*/
getDefaultPreprocessors: function() {
return this.defaultPreprocessors;
},
<span id='Ext-Class-static-method-setDefaultPreprocessors'> /**
</span> * Set the default array stack of default pre-processors
*
* @private
* @param {Array} preprocessors
* @return {Ext.Class} this
* @static
*/
setDefaultPreprocessors: function(preprocessors) {
this.defaultPreprocessors = Ext.Array.from(preprocessors);
return this;
},
<span id='Ext-Class-static-method-setDefaultPreprocessorPosition'> /**
</span> * Insert this pre-processor at a specific position in the stack, optionally relative to
* any existing pre-processor. For example:
*
* Ext.Class.registerPreprocessor('debug', function(cls, data, fn) {
* // Your code here
*
* if (fn) {
* fn.call(this, cls, data);
* }
* }).setDefaultPreprocessorPosition('debug', 'last');
*
* @private
* @param {String} name The pre-processor name. Note that it needs to be registered with
* {@link Ext.Class#registerPreprocessor registerPreprocessor} before this
* @param {String} offset The insertion position. Four possible values are:
* 'first', 'last', or: 'before', 'after' (relative to the name provided in the third argument)
* @param {String} relativeName
* @return {Ext.Class} this
* @static
*/
setDefaultPreprocessorPosition: function(name, offset, relativeName) {
var defaultPreprocessors = this.defaultPreprocessors,
index;
if (typeof offset == 'string') {
if (offset === 'first') {
defaultPreprocessors.unshift(name);
return this;
}
else if (offset === 'last') {
defaultPreprocessors.push(name);
return this;
}
offset = (offset === 'after') ? 1 : -1;
}
index = Ext.Array.indexOf(defaultPreprocessors, relativeName);
if (index !== -1) {
Ext.Array.splice(defaultPreprocessors, Math.max(0, index + offset), 0, name);
}
return this;
},
configNameCache: {},
getConfigNameMap: function(name) {
var cache = this.configNameCache,
map = cache[name],
capitalizedName;
if (!map) {
capitalizedName = name.charAt(0).toUpperCase() + name.substr(1);
map = cache[name] = {
internal: name,
initialized: '_is' + capitalizedName + 'Initialized',
apply: 'apply' + capitalizedName,
update: 'update' + capitalizedName,
'set': 'set' + capitalizedName,
'get': 'get' + capitalizedName,
doSet : 'doSet' + capitalizedName,
changeEvent: name.toLowerCase() + 'change'
};
}
return map;
}
});
<span id='Ext-Class-cfg-extend'> /**
</span> * @cfg {String} extend
* The parent class that this class extends. For example:
*
* Ext.define('Person', {
* say: function(text) { alert(text); }
* });
*
* Ext.define('Developer', {
* extend: 'Person',
* say: function(text) { this.callParent(["print "+text]); }
* });
*/
ExtClass.registerPreprocessor('extend', function(Class, data) {
var Base = Ext.Base,
basePrototype = Base.prototype,
extend = data.extend,
Parent, parentPrototype, i;
delete data.extend;
if (extend && extend !== Object) {
Parent = extend;
}
else {
Parent = Base;
}
parentPrototype = Parent.prototype;
if (!Parent.$isClass) {
for (i in basePrototype) {
if (!parentPrototype[i]) {
parentPrototype[i] = basePrototype[i];
}
}
}
Class.extend(Parent);
Class.triggerExtended.apply(Class, arguments);
if (data.onClassExtended) {
Class.onExtended(data.onClassExtended, Class);
delete data.onClassExtended;
}
}, true);
//<feature classSystem.statics>
<span id='Ext-Class-cfg-statics'> /**
</span> * @cfg {Object} statics
* List of static methods for this class. For example:
*
* Ext.define('Computer', {
* statics: {
* factory: function(brand) {
* // 'this' in static methods refer to the class itself
* return new this(brand);
* }
* },
*
* constructor: function() { ... }
* });
*
* var dellComputer = Computer.factory('Dell');
*/
ExtClass.registerPreprocessor('statics', function(Class, data) {
Class.addStatics(data.statics);
delete data.statics;
});
//</feature>
//<feature classSystem.inheritableStatics>
<span id='Ext-Class-cfg-inheritableStatics'> /**
</span> * @cfg {Object} inheritableStatics
* List of inheritable static methods for this class.
* Otherwise just like {@link #statics} but subclasses inherit these methods.
*/
ExtClass.registerPreprocessor('inheritableStatics', function(Class, data) {
Class.addInheritableStatics(data.inheritableStatics);
delete data.inheritableStatics;
});
//</feature>
//<feature classSystem.config>
<span id='Ext-Class-cfg-config'> /**
</span> * @cfg {Object} config
* List of configuration options with their default values, for which automatically
* accessor methods are generated. For example:
*
* Ext.define('SmartPhone', {
* config: {
* hasTouchScreen: false,
* operatingSystem: 'Other',
* price: 500
* },
* constructor: function(cfg) {
* this.initConfig(cfg);
* }
* });
*
* var iPhone = new SmartPhone({
* hasTouchScreen: true,
* operatingSystem: 'iOS'
* });
*
* iPhone.getPrice(); // 500;
* iPhone.getOperatingSystem(); // 'iOS'
* iPhone.getHasTouchScreen(); // true;
*/
ExtClass.registerPreprocessor('config', function(Class, data) {
var config = data.config,
prototype = Class.prototype;
delete data.config;
Ext.Object.each(config, function(name, value) {
var nameMap = ExtClass.getConfigNameMap(name),
internalName = nameMap.internal,
initializedName = nameMap.initialized,
applyName = nameMap.apply,
updateName = nameMap.update,
setName = nameMap.set,
getName = nameMap.get,
hasOwnSetter = (setName in prototype) || data.hasOwnProperty(setName),
hasOwnApplier = (applyName in prototype) || data.hasOwnProperty(applyName),
hasOwnUpdater = (updateName in prototype) || data.hasOwnProperty(updateName),
optimizedGetter, customGetter;
if (value === null || (!hasOwnSetter && !hasOwnApplier && !hasOwnUpdater)) {
prototype[internalName] = value;
prototype[initializedName] = true;
}
else {
prototype[initializedName] = false;
}
if (!hasOwnSetter) {
data[setName] = function(value) {
var oldValue = this[internalName],
applier = this[applyName],
updater = this[updateName];
if (!this[initializedName]) {
this[initializedName] = true;
}
if (applier) {
value = applier.call(this, value, oldValue);
}
if (typeof value != 'undefined') {
this[internalName] = value;
if (updater && value !== oldValue) {
updater.call(this, value, oldValue);
}
}
return this;
};
}
if (!(getName in prototype) || data.hasOwnProperty(getName)) {
customGetter = data[getName] || false;
if (customGetter) {
optimizedGetter = function() {
return customGetter.apply(this, arguments);
};
}
else {
optimizedGetter = function() {
return this[internalName];
};
}
data[getName] = function() {
var currentGetter;
if (!this[initializedName]) {
this[initializedName] = true;
this[setName](this.config[name]);
}
currentGetter = this[getName];
if ('$previous' in currentGetter) {
currentGetter.$previous = optimizedGetter;
}
else {
this[getName] = optimizedGetter;
}
return optimizedGetter.apply(this, arguments);
};
}
});
Class.addConfig(config, true);
});
//</feature>
//<feature classSystem.mixins>
<span id='Ext-Class-cfg-mixins'> /**
</span> * @cfg {String[]/Object} mixins
* List of classes to mix into this class. For example:
*
* Ext.define('CanSing', {
* sing: function() {
* alert("I'm on the highway to hell...")
* }
* });
*
* Ext.define('Musician', {
* mixins: ['CanSing']
* })
*
* In this case the Musician class will get a `sing` method from CanSing mixin.
*
* But what if the Musician already has a `sing` method? Or you want to mix
* in two classes, both of which define `sing`? In such a cases it's good
* to define mixins as an object, where you assign a name to each mixin:
*
* Ext.define('Musician', {
* mixins: {
* canSing: 'CanSing'
* },
*
* sing: function() {
* // delegate singing operation to mixin
* this.mixins.canSing.sing.call(this);
* }
* })
*
* In this case the `sing` method of Musician will overwrite the
* mixed in `sing` method. But you can access the original mixed in method
* through special `mixins` property.
*/
ExtClass.registerPreprocessor('mixins', function(Class, data, hooks) {
var mixins = data.mixins,
name, mixin, i, ln;
delete data.mixins;
Ext.Function.interceptBefore(hooks, 'onCreated', function() {
if (mixins instanceof Array) {
for (i = 0,ln = mixins.length; i < ln; i++) {
mixin = mixins[i];
name = mixin.prototype.mixinId || mixin.$className;
Class.mixin(name, mixin);
}
}
else {
for (var mixinName in mixins) {
if (mixins.hasOwnProperty(mixinName)) {
Class.mixin(mixinName, mixins[mixinName]);
}
}
}
});
});
//</feature>
//<feature classSystem.backwardsCompatible>
// Backwards compatible
Ext.extend = function(Class, Parent, members) {
if (arguments.length === 2 && Ext.isObject(Parent)) {
members = Parent;
Parent = Class;
Class = null;
}
var cls;
if (!Parent) {
throw new Error("[Ext.extend] Attempting to extend from a class which has not been loaded on the page.");
}
members.extend = Parent;
members.preprocessors = [
'extend'
//<feature classSystem.statics>
,'statics'
//</feature>
//<feature classSystem.inheritableStatics>
,'inheritableStatics'
//</feature>
//<feature classSystem.mixins>
,'mixins'
//</feature>
//<feature classSystem.config>
,'config'
//</feature>
];
if (Class) {
cls = new ExtClass(Class, members);
// The 'constructor' is given as 'Class' but also needs to be on prototype
cls.prototype.constructor = Class;
} else {
cls = new ExtClass(members);
}
cls.prototype.override = function(o) {
for (var m in o) {
if (o.hasOwnProperty(m)) {
this[m] = o[m];
}
}
};
return cls;
};
//</feature>
}());
</pre>
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