TCustomImageList.RegisterChanges procedure
Registers a TChangeLink object for notifications when the image list is changed.
Declaration
procedure RegisterChanges(Value: TChangeLink)Arguments
Value | Reference to the ChangeLink object. |
Description
RegisterChanges is a procedure used to register the specified
change link object to receive change notifications when the image list is
changed.
Value contains a
TChangeLink instance that represents
the class subscribing to the event notifications. When AValue is assigned,
but not yet stored in the internal change link list, the current class
instance is assigned as the Sender for change notifications. Value is added
to the internal list of subscribers.
No actions are performed when Value is unassigned (contains Nil) or when it has already been added to the internal list of subscribers.
Value, and other subscribers the internal list, receive change notifications
when the Reference class for an image resolution is freed and when the
private NotifyChangeLink method is called.
Use UnRegisterChanges to remove a TChangeLink instance from the
internal list of subscribers.
NotifyChangeLink is called from the implementation of the Change
method.
See also
An experiment, built from development snapshots. Not the official Free Pascal or Lazarus documentation.