TObservedHook¶

Observer pattern helper class implementing IFPObserved interface

Declaration¶

Source position: fpobserver.pp line 33

type

  TObservedHook = class(TObject, IFPObserved)
  public
    constructor CreateSender;
    destructor Destroy;
    procedure FPOAttachObserver;
    procedure FPODetachObserver;
    procedure Changed;
    procedure AddItem;
    procedure DeleteItem;
    procedure CustomNotify;
    procedure FPONotifyObservers;
    property Sender: TObject; {r}
  end;

Inheritance¶

Implements: IFPObserved

Description¶

The TObservedHook class provides a simple way to add observer pattern support to any object. It implements the IFPObserved interface and manages a list of observers that implement the IFPObserver interface.

Objects can use this class as a helper to notify observers about changes, item additions, deletions, or custom events. The class handles attaching and detaching observers automatically and provides methods for different types of notifications.

This class is intended to be used as a component within other classes that need to support observation, rather than being used directly as a standalone object.

Properties¶

Member	Visibility	Description
Sender read only	public	Default sender object for notifications

See all Properties

Methods¶

Member	Visibility	Description
AddItem	public	Notifies observers that an item was added
Changed	public	Notifies all observers that the object has changed
CreateSender	public	Creates an observer hook with a specified sender object
CustomNotify	public	Sends custom notification to all observers
DeleteItem	public	Notifies observers that an item was deleted
Destroy	public	Destroys the observer hook and notifies all observers
FPOAttachObserver	public	Attaches an observer implementing IFPObserver interface
FPODetachObserver	public	Detaches an observer from the notification list
FPONotifyObservers	public	Core method to notify all observers about operations

See all Methods