Yahoo! UI Library

Container  2.8.0r4

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Class YAHOO.util.Config

Config is a utility used within an Object to allow the implementer to maintain a list of local configuration properties and listen for changes to those properties dynamically using CustomEvent. The initial values are also maintained so that the configuration can be reset at any given point to its initial state.

Constructor

YAHOO.util.Config ( owner )
Parameters:
owner <Object> The owner Object to which this Config Object belongs

Properties

config - private Object

Maintains the local collection of configuration property objects and their specified values

eventQueue - private Object

Maintains the local, normalized CustomEvent queue

initialConfig - private Object

Maintains the local collection of configuration property objects as they were initially applied. This object is used when resetting a property.

owner - Object

Object reference to the owner of this Config Object

queueInProgress - Boolean

Boolean flag that specifies whether a queue is currently being executed

YAHOO.util.Config.BOOLEAN_TYPE - private static final object

Constant representing the boolean type string

YAHOO.util.Config.CONFIG_CHANGED_EVENT - private static final object

Constant representing the CustomEvent type for the config changed event.

Methods

addProperty

void addProperty ( key , propertyObject )
Adds a property to the Config Object's private config hash.
Parameters:
key <String> The configuration property's name
propertyObject <Object> The Object containing all of this property's arguments
Returns: void

applyConfig

void applyConfig ( userConfig , init )
Applies a key-value Object literal to the configuration, replacing any existing values, and queueing the property events. Although the values will be set, fireQueue() must be called for their associated events to execute.
Parameters:
userConfig <Object> The configuration Object literal
init <Boolean> When set to true, the initialConfig will be set to the userConfig passed in, so that calling a reset will reset the properties to the passed values.
Returns: void

checkBoolean

Boolean checkBoolean ( val )
Validates that the value passed in is a Boolean.
Parameters:
val <Object> The value to validate
Returns: Boolean
true, if the value is valid

checkNumber

Boolean checkNumber ( val )
Validates that the value passed in is a number.
Parameters:
val <Object> The value to validate
Returns: Boolean
true, if the value is valid

destroy

void destroy ( )
Sets all properties to null, unsubscribes all listeners from each property's change event and all listeners from the configChangedEvent.
Returns: void

fireEvent

private void fireEvent ( key , Object )
Fires a configuration property event using the specified value.
Parameters:
key <String> The configuration property's name
Object <value> The value of the correct type for the property
Returns: void

fireQueue

void fireQueue ( )
Fires the normalized list of queued property change events
Returns: void

getConfig

Object getConfig ( )
Returns a key-value configuration map of the values currently set in the Config Object.
Returns: Object
The current config, represented in a key-value map

getProperty

Object getProperty ( key )
Returns the value of specified property.
Parameters:
key <String> The name of the property
Returns: Object
The value of the specified property

init

void init ( owner )
Initializes the configuration Object and all of its local members.
Parameters:
owner <Object> The owner Object to which this Config Object belongs
Returns: void

outputEventQueue

String outputEventQueue ( )
Returns a string representation of the Config object's current CustomEvent queue
Returns: String
The string list of CustomEvents currently queued for execution

queueProperty

Boolean queueProperty ( key , value )
Sets the value of a property and queues its event to execute. If the event is already scheduled to execute, it is moved from its current position to the end of the queue.
Parameters:
key <String> The name of the property
value <String> The value to set the property to
Returns: Boolean
true, if the set was successful, false if it failed.

refireEvent

void refireEvent ( key )
Fires the event for a property using the property's current value.
Parameters:
key <String> The name of the property
Returns: void

refresh

void refresh ( )
Refires the events for all configuration properties using their current values.
Returns: void

resetProperty

Boolean resetProperty ( key )
Resets the specified property's value to its initial value.
Parameters:
key <String> The name of the property
Returns: Boolean
True is the property was reset, false if not

setProperty

Boolean setProperty ( key , value , silent )
Sets the value of a property. If the silent property is passed as true, the property's event will not be fired.
Parameters:
key <String> The name of the property
value <String> The value to set the property to
silent <Boolean> Whether the value should be set silently, without firing the property event.
Returns: Boolean
True, if the set was successful, false if it failed.

subscribeToConfigEvent

Boolean subscribeToConfigEvent ( key , handler , obj , overrideContext )
Subscribes an external handler to the change event for any given property.
Parameters:
key <String> The property name
handler <Function> The handler function to use subscribe to the property's event
obj <Object> The Object to use for scoping the event handler (see CustomEvent documentation)
overrideContext <Boolean> Optional. If true, will override "this" within the handler to map to the scope Object passed into the method.
Returns: Boolean
True, if the subscription was successful, otherwise false.

toString

String toString ( )
Returns a string representation of the Config object
Returns: String
The Config object in string format.

unsubscribeFromConfigEvent

Boolean unsubscribeFromConfigEvent ( key , handler , obj )
Unsubscribes an external handler from the change event for any given property.
Parameters:
key <String> The property name
handler <Function> The handler function to use subscribe to the property's event
obj <Object> The Object to use for scoping the event handler (see CustomEvent documentation)
Returns: Boolean
True, if the unsubscription was successful, otherwise false.

YAHOO.util.Config.alreadySubscribed

static Boolean YAHOO.util.Config.alreadySubscribed ( evt , fn , obj )
Checks to determine if a particular function/Object pair are already subscribed to the specified CustomEvent
Parameters:
evt <YAHOO.util.CustomEvent> The CustomEvent for which to check the subscriptions
fn <Function> The function to look for in the subscribers list
obj <Object> The execution scope Object for the subscription
Returns: Boolean
true, if the function/Object pair is already subscribed to the CustomEvent passed in

Events

configChangedEvent

configChangedEvent ( )
Custom Event, notifying subscribers when Config properties are set (setProperty is called without the silent flag


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