THotPDF.AddPageLayer Method
Registers a reusable background, header, footer or foreground callback for stable page composition
Declaration
function AddPageLayer(Kind: THPDFPageLayerKind; Handler: THPDFPageLayerEvent): Integer;Unit
HPDFDoc
Parameters
| Name | Purpose |
|---|---|
Kind | Composition position for the reusable page layer |
Handler | Object-method callback invoked once for each generated page |
Return value
Returns a stable positive identifier for later removal
Usage notes
- 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