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 2152

Type
  TBasicActionLink = class (TObject)
  private
    FOnChange : TNotifyEvent;
  protected
    FAction : TBasicAction;
    procedure AssignClient(AClient: TObject);  Virtual;
    procedure Change;  Virtual;
    function IsOnExecuteLinked : Boolean;  Virtual;
    procedure SetAction(Value: TBasicAction);  Virtual;
    procedure SetOnExecute(Value: TNotifyEvent);  Virtual;
  public
    constructor Create(AClient: TObject);  Virtual;
    destructor Destroy;  Override;
    function Execute(AComponent: TComponent) : Boolean;  Virtual;
    function Update : Boolean;  Virtual;
    Action : TBasicAction;
    OnChange : TNotifyEvent;
  end
  ;

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.

Members

Member	Type	Visibility	Description
Action	Property	public	The action to which the link was assigned.
AssignClient	Method	protected	Assigns a control (client) to the action link.
Change	Method	protected	Executed whenever the Action is changed.
Create	Method	public	Creates a new instance of the TBasicActionLink class
Destroy	Method	public	Destroys the TBasicActionLink instance.
Execute	Method	public	Calls the action's Execute method.
FAction	Field	protected	The action with which this link is associated
FOnChange	Field	private
IsOnExecuteLinked	Method	protected	Returns whether the client has it's OnExecute property linked.
OnChange	Property	public	Event handler triggered when the action's properties change
SetAction	Method	protected	Sets the action with which the actionlink is associated.
SetOnExecute	Method	protected	Assigns the OnExecute handler to the client
Update	Method	public	Calls the action's Update method

Inheritance

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

See also

Name	Description
TBasicAction	Abstract base class for all Actions.
TBasicAction	Abstract base class for all Actions.
TBasicAction	Abstract base class for all Actions.
TNotifyEvent	Standard event handler type.
TNotifyEvent	Standard event handler type.

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