TApplication.ControlDestroyed procedure
Clears all references to the destroyed control.
Declaration
procedure ControlDestroyed(AControl: TControl)Arguments
AControl | Control instance which is being freed. |
Description
ControlDestroyed is a method used to update the application when
the control in
AControl is freed. ControlDestroyed ensures that
any property in the application that contains a reference to AControl is set
to
Nil, including:
- MainForm
- MouseControl
- HintControl
- CreatingForm (internal)
Properties in the Screen singleton are also updated to remove any
references to AControl, including:
- ActiveControl
- ActiveCustomForm
- ActiveForm
- FocusedForm
The UpdateLastActive method in Screen is called to perform change
notification for the forms and / or controls.
ControlDestroyed is called from the Destroy method in
TControl.
See also
An experiment, built from development snapshots. Not the official Free Pascal or Lazarus documentation.