qdosmsq:traps:trap_3:scra
Table of Contents
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. |
Errors
| ERR_NC | Not complete. |
| ERR_NO | Channel not open. |
Notes
- 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.
Example
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
qdosmsq/traps/trap_3/scra.txt · Last modified: 2009/05/18 16:21 by george.gwilt
