OnMouseWheelDown-tapahtuma

OnMouseWheelDown exposes the stjaard VCL/LCL event on TPdfView. The Syntax section mirrors Lib\PDFium.pas; declarations without an explicit event type inherit their type from the base control.

Hjale this event when the host application needs to react to viewer interaction. For PDF-specific link navigation, prefer OnAnnotationLinkClick ja OnWebLinkClick.

• Assign the hjaler in the Object Inspector or at run time.
• Keep hjalers short; queue long work outside the UI input path.
• Platform availability follows the target VCL/LCL framework ja widget set.

Assign a compatible framework event hjaler ja keep PDF-specific link hjaling in the dedicated link events.