| [Overview][Constants][Types][Classes][Procedures and functions][Variables][Index] |
[Properties (by Name)] [Methods (by Name)] [Events (by Name)]
Link between actions and action clients (e.g. controls)
Source position: classesh.inc line 1684
type TBasicActionLink = class(TObject) |
||
protected |
||
|
The action with which this link is associated |
|
procedure AssignClient(); virtual; |
|
Assigns a control (client) to the action link. |
procedure Change; virtual; |
|
Executed whenever the Action is changed. |
function IsOnExecuteLinked; virtual; |
|
Returns whether the client has it's OnExecute property linked. |
procedure SetAction(); virtual; |
|
Sets the action with which the actionlink is associated. |
procedure SetOnExecute(); virtual; |
|
Assigns the OnExecute handler to the client |
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; |
|
Link between actions and action clients (e.g. controls) |
|
| | | ||
|
Base class of all classes. |
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 descendents of TBasicActionLink which communicate changes in the action to the component.
|
Abstract base class for all Actions. |
| lazarus-ccr.sourceforge.net |