[Overview][Constants][Types][Classes][Procedures and functions][Variables][Index] Reference for unit 'Classes' (#rtl)

TBasicActionLink

[Properties (by Name)] [Methods (by Name)] [Events (by Name)]

Link between actions and action clients (e.g. controls)

Declaration

Source position: classesh.inc line 1997

type TBasicActionLink = class(TObject)

public

  constructor Create(); virtual;

  

Creates a new instance of the TBasicActionLink class

  destructor Destroy; override;

  

Destroys the TBasicActionLink instance.

  function Execute(); virtual;

  

Calls the action's Execute method.

  function Update; virtual;

  

Calls the action's Update method

  property Action: TBasicAction; [rw]

  

The action to which the link was assigned.

  property OnChange: TNotifyEvent; [rw]

  

Event handler triggered when the action's properties change

end;

Inheritance

TBasicActionLink

  

Link between actions and action clients (e.g. controls)

|

TObject

  

Base class of all classes.

Description

TBasicActionLink links an Action to its clients. With each client for an action, a TBasicActionLink class is instantiated to handle the communication between the action and the client. It passes events between the action and its clients, and thus presents the action with a uniform interface to the clients.

An application programmer should never use a TBasicActionLink instance directly; They are created automatically when an action is associated with a component. Component programmers should create specialized descendants of TBasicActionLink which communicate changes in the action to the component.

See also

TBasicAction

  

Abstract base class for all Actions.


Documentation generated on: May 14 2021