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


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

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


Source position: classesh.inc line 2002

type TBasicActionLink = class(TObject)


  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





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




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



Abstract base class for all Actions.

Documentation generated on: Jun 22 2020