TBaseMediator¶

Base class for mediating data between model and view objects

Declaration¶

Source position: fpobserver.pp line 58

type

  TBaseMediator = class(TComponent, IFPObserver)
  public
    destructor Destroy;
    procedure ObjectToView;
    procedure ViewToObject;
    class function ViewClass : TClass;
    class function CompositeMediator : Boolean;
    property Subject: TObject; {rw}
    property View: TObject; {r}
    property Valuelist: TObjectList; {rw}
  published
    property SubjectPropertyName: string; {rw}
    property Active: Boolean; {rw}
    property ReadOnly: Boolean; {rw}
    property OnViewToObject: TMediatingEvent; {rw}
    property OnObjectToView: TMediatingEvent; {rw}
  end;

Inheritance¶

Implements: IFPObserver

Description¶

The TBaseMediator class provides automatic data binding between model objects (subjects) and view components. It implements the observer pattern to automatically synchronize data when either the model or view changes.

The mediator supports bidirectional data binding, read-only modes, and custom data transfer events. Subjects must implement the IFPObserved interface, while views must have published properties that can be accessed by name.

This class serves as the base class for more specialized mediators like list mediators and component mediators, providing common functionality for property validation, observer management, and data transfer coordination.

Properties¶

Member	Visibility	Description
Active	published	Enables or disables automatic data synchronization
ReadOnly	published	Prevents data transfer from view to subject when True
Subject	public	Model object implementing IFPObserved interface
SubjectPropertyName	published	Name of property in subject object to mediate
Valuelist	public	Optional list of values for list-based mediators
View read only	public	View component for data display and editing

See all Properties

Methods¶

Member	Visibility	Description
CompositeMediator	public	Indicates whether this is a composite mediator
Destroy	public	Destroys the mediator and cleans up observer attachments
ObjectToView	public	Copies data from subject object to view component
ViewClass	public	Returns the minimum view class this mediator can handle
ViewToObject	public	Copies data from view component to subject object

See all Methods

Events¶

Member	Visibility	Description
OnObjectToView	published	Event triggered when copying data from subject to view
OnViewToObject	published	Event triggered when copying data from view to subject

See all Events

Name	Description
TObservedHook	Observer pattern helper class implementing IFPObserved interface
TComponentMediator	General-purpose mediator for any TComponent-based view