TBasicAction¶

Abstract base class for all Actions.

Declaration¶

Source position: classesh.inc line 2764

type

  TBasicAction = class(TComponent)
  public
    constructor Create;
    destructor Destroy;
    function HandlesTarget : Boolean;
    procedure UpdateTarget;
    procedure ExecuteTarget;
    function Execute : Boolean;
    procedure RegisterChanges;
    procedure UnRegisterChanges;
    function Update : Boolean;
    function Suspended : Boolean;
    property ActionComponent: TComponent; {rw}
    property OnExecute: TNotifyEvent; {rw}
    property OnUpdate: TNotifyEvent; {rw}
    property Clients[Idx : Integer]: TObject; {r}
  end;

Inheritance¶

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.

Properties¶

Member	Visibility	Description
ActionComponent	public	Returns the component that initiated the action.
Clients read only	public

See all Properties

Methods¶

Member	Visibility	Description
Create	public	Creates a new instance of a TBasicAction class.
Destroy	public	Destroys the action.
Execute	public	Triggers the OnExecute event.
ExecuteTarget	public	Executes the action on the Target object.
HandlesTarget	public	Determines whether Target can be handled by this action.
RegisterChanges	public	Registers a new client with the action.
Suspended	public
UnRegisterChanges	public	Unregisters a client from the list of clients.
Update	public	Triggers the OnUpdate event.
UpdateTarget	public	Notify client controls when the action updates itself.

See all Methods

Events¶

Member	Visibility	Description
OnExecute	public	Event triggered when the action executes.
OnUpdate	public	Event triggered when the application is idle.

See all Events

Name	Description
TBasicActionLink	Link between actions and action clients (e.g. controls).
TComponent	Base class for all components that need owner-owned functionality.