THotPDF.AddPageLayer Method

Registers a reusable background, header, footer, or foreground callback for stable page composition

اعلان

function AddPageLayer(Kind: THPDFPageLayerKind; Handler: THPDFPageLayerEvent): Integer;

HPDFDoc

نام	هدف
`Kind`	Composition position for the reusable page layer
`Handler`	Object-method callback invoked once for each generated page

Returns a stable positive identifier for later removal

Register page layers before BeginDoc
Callbacks execute once per page in background, header, content, footer, and foreground order
Each callback is isolated by a graphics-state save and restore pair