`rasKeyStroke`

Keyboard input for the viewer — real, narrow behavior:

TPDFCursor __stdcall rasKeyStroke(IPGC CachePtr, BOOL32 Down, uint32_t CharCode, uint32_t ShiftState);

Delphi

function rasKeyStroke(CachePtr: IPGC; Down: LongBool; CharCode, ShiftState: Cardinal): TPDFCursor; stdcall;

Purpose. Keyboard input for the viewer — real, narrow behavior: Esc clears the current selection; Ctrl+A marquee-selects the whole current page.

Description. Acts only on key-down (if not Down then Exit) — key-up events are accepted but always no-op. Recognizes exactly two key combinations by hardcoded virtual-key/shift-mask constants (KEY_ESC = 27, KEY_A = 65, SS_CTRL = $04): Esc clears HasSel/Dragging/the cached selected-text buffer; Ctrl+A calls SelectWholePage(C) to select the entire current page as a device rect matching the page's own on-screen placement. No other key is handled — there is no text-input, arrow-key-scroll, or page-navigation keyboard handling anywhere in this function.

Parameters.

Parameter	Description
`CachePtr`	Target page cache.
`Down`	`False` (key-up) is always a no-op.
`CharCode`	Only `27` (`Esc`) and `65` (`A`, with `Ctrl`) have any effect.
`ShiftState`	Only bit `$04` (`Ctrl`) is checked, and only in combination with `CharCode = 65`.

Return value. pcrArrow1 in all cases (including the two recognized key combinations — no cursor-shape change results from either).

C# (P/Invoke)

wrappers/dotnet/LumasPdf.cs

public static extern TPDFCursor rasKeyStroke(IntPtr CachePtr, [MarshalAs(UnmanagedType.Bool)] bool Down, uint CharCode, uint ShiftState);

Area

Rendering & Viewer