SD_PAN/IOW_PANA etc

These traps pan all or part of a window.

Trap	Value in D0.B	Action
SD_PAN/IOW_PANA	$1B	Pan all of window
SD_PANLN/IOW_PANL	$1E	Pan cursor line
SD_PANRT/IOW_PANR	$1F	Pan right hand end of cursor line

Call Parameters		Return Parameters
D0.B	See above	D0.L	Error return.
D1.W	Distance to pan	D1.L	Corrupted.
D3.W	Timeout	D3.L	Preserved.
A0.L	Channel ID	A0.L	Preserved.

ERR_NC	Not complete.
ERR_NO	Channel not open.

All registers not shown above are not used on entry and are preserved on exit.
The number in D1.W is the number of pixels to pan. A positive distance implies that the pixels will move to the right. The space created will be filled with the paper colour.
For SD_PANRT/IOW_PANR the right hand end includes the character at the cursor position.

The example below shows the use of this trap call to jiggle part of the cursor line. It is assumed that A0 contains the window's ID.

jiggle  
        moveq   #-1,d3          ; Timeout
        moveq   #2,d1           ; Move right 2 pixels
        bsr     pan
        moveq   #10,d2          ; Delay a bit
loop    dbf     d2,loop
        moveq   #-2,d1          ; Move left 2 pixels
        bsr     pan

pan     moveq   #sd_panrt,d0    ; $1F
        trap    #3              ; Pan
        tst.l   d0              ; OK? . .
        bne     error           ; . . no!
        rts

SD_PAN/IOW_PANA etc

Errors

Notes

Example

QDOS Internals