fpObserver unit

The fpobserver unit provides a complete implementation of the Observer pattern for Free Pascal applications. It includes classes and interfaces for creating observable objects that can notify multiple observers when their state changes.

The unit contains the TObservedHook class for adding observer support to any object, the TBaseMediator hierarchy for automatic data binding between model and view objects, and mediator management classes for registering and finding appropriate mediators.

Classes and records

EMediator	class	Exception class for mediator-related errors
TBaseListMediator	class	Base mediator for handling lists of observable objects
TBaseMediator	class	Base class for mediating data between model and view objects
TColumnsListItemMediator	class	List item mediator with multi-column support
TColumnsListMediator	class	List mediator supporting multiple columns with field configuration
TComponentMediator	class	General-purpose mediator for any TComponent-based view
TListItemMediator	class	Mediator for individual items within list mediators
TMediatorDef	class	Definition for registering mediators with the mediator manager
TMediatorDefs	class	Collection of mediator definitions for the manager
TMediatorFieldInfo	class	Describes a column in columnar list display mediators
TMediatorFieldInfoList	class	Collection of field information for columnar list displays
TMediatorManager	class	Central manager for registering and finding mediator definitions
TObservedHook	class	Observer pattern helper class implementing IFPObserved interface

Procedures and functions

MediatorError	procedure	Raises formatted mediator error with context information
MediatorManager	function	Returns the global singleton mediator manager instance

Types

TMediatingEvent	procedure type	Event type for mediating data transfer operations
TMediatorClass	type	Class reference type for TBaseMediator descendants
TOnBeforeSetupField	procedure type	Event type for formatting field values before display

Uses

• Classes
• SysUtils
• typinfo
• Contnrs