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

TBasicAction

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

Abstract base class for all Actions.

Declaration

Source position: classesh.inc line 2025

type TBasicAction = class(TComponent)

public

  constructor Create(); override;

  

Creates a new instance of a TBasicAction class.

  destructor Destroy; override;

  

Destroys the action.

  function HandlesTarget(); virtual;

  

Determines whether Target can be handled by this action

  procedure UpdateTarget(); virtual;

  

Notify client controls when the action updates itself.

  procedure ExecuteTarget(); virtual;

  

Executes the action on the Target object

  function Execute; dynamic;

  

Triggers the OnExecute event

  procedure RegisterChanges();

  

Registers a new client with the action.

  procedure UnRegisterChanges();

  

Unregisters a client from the list of clients

  function Update; virtual;

  

Triggers the OnUpdate event

  property ActionComponent: TComponent; [rw]

  

Returns the component that initiated the action.

  property OnExecute: TNotifyEvent; [rw]

  

Event triggered when the action executes.

  property OnUpdate: TNotifyEvent; [rw]

  

Event triggered when the application is idle.

end;

Inheritance

TBasicAction

  

Abstract base class for all Actions.

|

TComponent,IUnknown,IInterfaceComponentReference

  

Base class for all components that need owner-owned functionality.

|

TPersistent,IFPObserved

  

Base class for streaming system and persistent properties.

|

TObject

Description

TBasicAction implements a basic action class from which all actions are derived. It introduces all basic methods of an action, and implements functionality to maintain a list of clients, i.e. components that are connected with this action.

Do not create instances of TBasicAction. Instead, create a descendant class and create an instance of this class instead.

See also

TBasicActionLink

  

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

TComponent

  

Base class for all components that need owner-owned functionality.


Documentation generated on: Jun 22 2020