[Overview][Constants][Types][Classes][Procedures and functions][Variables][Index] Reference for unit 'Controls' (#lcl)

TGraphicControl.DoOnParentHandleDestruction

Performs actions when the handle for the parent control is freed.

Declaration

Source position: controls.pp line 2466

protected procedure TGraphicControl.DoOnParentHandleDestruction; override;

Description

DoOnParentHandleDestruction is overridden in TGraphicControl to re-implement the method in the ancestor class. It ensures that Handle for the Canvas is freed when the parent handler is destroyed.

See also

TGraphicControl.Canvas

  

A clipped window into the parent Canvas.

TControlCanvas.FreeHandle

  

Frees the Handle for the control canvas, and its device context when assigned.

TControl.DoOnParentHandleDestruction

  

Performs actions needed when the handle for the parent control is freed.

Version 3.2 Generated 2024-02-25 Home