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observable.d.ts
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observable.d.ts
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/**
* Contains the Observable class, which represents an observable object, or "data" in the model-view paradigm.
* @module "data/observable"
*/ /** */
/**
* Base event data.
*/
export interface EventData {
/**
* The name of the event.
*/
eventName: string;
/**
* The Observable instance that has raised the event.
*/
object: Observable;
}
/**
* Data for the "propertyChange" event.
*/
export interface PropertyChangeData extends EventData {
/**
* The name of the property that has changed.
*/
propertyName: string;
/**
* The new value of the property.
*/
value: any;
/**
* The previous value of the property.
*/
oldValue?: any;
}
/**
* Helper class that is used to fire property change even when real object is the same.
* By default property change will not be fired for a same object.
* By wrapping object into a WrappedValue instance `same object restriction` will be passed.
*/
export class WrappedValue {
/**
* Property which holds the real value.
*/
wrapped: any;
/**
* Creates an instance of WrappedValue object.
* @param value - the real value which should be wrapped.
*/
constructor(value: any);
/**
* Gets the real value of previously wrappedValue.
* @param value - Value that should be unwraped. If there is no wrappedValue property of the value object then value will be returned.
*/
static unwrap(value: any): any;
/**
* Returns an instance of WrappedValue. The actual instance is get from a WrappedValues pool.
* @param value - Value that should be wrapped.
*/
static wrap(value: any): WrappedValue
}
/**
* Observable is used when you want to be notified when a change occurs. Use on/off methods to add/remove listener.
*/
export class Observable {
/**
* Please note that should you be using the `new Observable({})` constructor, it is **obsolete** since v3.0,
* and you have to migrate to the "data/observable" `fromObject({})` or the `fromObjectRecursive({})` functions.
*/
constructor();
/**
* String value used when hooking to propertyChange event.
*/
public static propertyChangeEvent: string;
/**
* A basic method signature to hook an event listener (shortcut alias to the addEventListener method).
* @param eventNames - String corresponding to events (e.g. "propertyChange"). Optionally could be used more events separated by `,` (e.g. "propertyChange", "change").
* @param callback - Callback function which will be executed when event is raised.
* @param thisArg - An optional parameter which will be used as `this` context for callback execution.
*/
on(eventNames: string, callback: (data: EventData) => void, thisArg?: any);
/**
* Raised when a propertyChange occurs.
*/
on(event: "propertyChange", callback: (data: EventData) => void, thisArg?: any);
/**
* Adds one-time listener function for the event named `event`.
* @param event Name of the event to attach to.
* @param callback A function to be called when the specified event is raised.
* @param thisArg An optional parameter which when set will be used as "this" in callback method call.
*/
once(event: string, callback: (data: EventData) => void, thisArg?: any);
/**
* Shortcut alias to the removeEventListener method.
*/
off(eventNames: string, callback?: any, thisArg?: any);
/**
* Adds a listener for the specified event name.
* @param eventNames Comma delimited names of the events to attach the listener to.
* @param callback A function to be called when some of the specified event(s) is raised.
* @param thisArg An optional parameter which when set will be used as "this" in callback method call.
*/
addEventListener(eventNames: string, callback: (data: EventData) => void, thisArg?: any);
/**
* Removes listener(s) for the specified event name.
* @param eventNames Comma delimited names of the events the specified listener is associated with.
* @param callback An optional parameter pointing to a specific listener. If not defined, all listeners for the event names will be removed.
* @param thisArg An optional parameter which when set will be used to refine search of the correct callback which will be removed as event listener.
*/
removeEventListener(eventNames: string, callback?: any, thisArg?: any);
/**
* Updates the specified property with the provided value.
*/
set(name: string, value: any): void;
/**
* Updates the specified property with the provided value and raises a property change event and a specific change event based on the property name.
*/
setProperty(name: string, value: any): void;
/**
* Gets the value of the specified property.
*/
get(name: string): any;
/**
* Notifies all the registered listeners for the event provided in the data.eventName.
* @param data The data associated with the event.
*/
notify<T extends EventData>(data: T): void;
/**
* Notifies all the registered listeners for the property change event.
*/
notifyPropertyChange(propertyName: string, value: any, oldValue?: any): void;
/**
* Checks whether a listener is registered for the specified event name.
* @param eventName The name of the event to check for.
*/
hasListeners(eventName: string): boolean;
//@private
/**
* This method is intended to be overriden by inheritors to provide additional implementation.
* @private
*/
_createPropertyChangeData(name: string, value: any, oldValue?: any): PropertyChangeData;
//@private
/**
* Filed to use instead of instanceof ViewBase.
* @private
*/
public _isViewBase: boolean;
/**
* @private
*/
_emit(eventNames: string);
//@endprivate
}
/**
* Creates an Observable instance and sets its properties according to the supplied JavaScript object.
* param obj - A JavaScript object used to initialize nativescript Observable instance.
*/
export function fromObject(obj: any): Observable;
/**
* Creates an Observable instance and sets its properties according to the supplied JavaScript object.
* This function will create new Observable for each nested object (expect arrays and functions) from supplied JavaScript object.
* param obj - A JavaScript object used to initialize nativescript Observable instance.
*/
export function fromObjectRecursive(obj: any): Observable;