VioScrollDn

Description

This call scrolls the entire display buffer (or area specified within the display buffer) down.

Syntax

 VioScrollDn

    (TopRow, LeftCol, BotRow, RightCol, Lines, Cell, VioHandle)

Parameters

TopRow (USHORT) - input

Top row to be scrolled.

LeftCol (USHORT) - input

Left column to be scrolled.

BotRow (USHORT) - input

Bottom row to be scrolled.

RightCol (USHORT) - input

Right column to be scrolled.

Lines (USHORT) - input

Number of lines to be inserted at the top of the screen area being scrolled. If 0 is specified, no lines are scrolled.

Cell (PBYTE) - input

Address of the character-attribute(s) pair (2 or 4 bytes) used as a fill character on inserted lines.

VioHandle (HVIO) - input

This must be zero unless the caller is a Presentation Manager application, in which case it must be the value returned by VioGetPs.

Return Code

rc (USHORT) - return

Return code descriptions are:

• 0 NO_ERROR
• 355 ERROR_VIO_MODE
• 358 ERROR_VIO_ROW
• 359 ERROR_VIO_COL
• 436 ERROR_VIO_INVALID_HANDLE
• 465 ERROR_VIO_DETACHED

Remarks

TopRow = 0 and LeftCol = 0 identifies the top left corner of the screen.

If a value greater than the maximum value is specified for TopRow, LeftCol, BotRow, RightCol, or Lines, the maximum value for that parameter is used.

If TopRow and LeftCol = 0 and if BotRow, RightCol, and Lines = 65535 (or -1 in assembler language), the entire screen is filled with the character-attribute pair defined by Cell.

OS/2 Toolkit 4.52

This function is defined on bsesub.h header of the OS/2 Toolkit on 4.52.

   #define VioScrollDn             VIO16SCROLLDN

Example Code

C Binding

#define INCL_VIO

USHORT  rc = VioScrollDn(TopRow, LeftCol, BotRow, RightCol, Lines, Cell,
                             VioHandle);

USHORT           TopRow;        /* Top row */
USHORT           LeftCol;       /* Left column */
USHORT           BotRow;        /* Bottom row */
USHORT           RightCol;      /* Right column */
USHORT           Lines;         /* Number of lines */
PBYTE            Cell;          /* Cell to be written */
HVIO             VioHandle;     /* Video handle */

USHORT           rc;            /* return code */

MASM Binding

EXTRN  VioScrollDn:FAR
INCL_VIO            EQU 1

PUSH   WORD    TopRow        ;Top row
PUSH   WORD    LeftCol       ;Left column
PUSH   WORD    BotRow        ;Bottom row
PUSH   WORD    RightCol      ;Right column
PUSH   WORD    Lines         ;Number of lines
PUSH@  OTHER   Cell          ;Cell to be written
PUSH   WORD    VioHandle     ;Video handle
CALL   VioScrollDn

Returns WORD