QDOS Internals

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====== SD_PXENQ/IOW_PIXQ & SD_CHENQ/IOW_CHRQ ======


These traps return the window size and cursor position.
^Trap^Value of D0.B^Action^
|SD_PXENQ/IOW_PIXQ|$0A|Cursor position in pixel coordinates|
|SD_CHENQ/IOW_CHRQ|$0B|Cursor position in character coordinates|

^Call Parameters^^Return Parameters^^
|D0.B|See above|D0.L|Error return.|
|D1.L| |D1.L|Corrupted.|
|D3.W|Timeout |D3.L|Preserved.|
|A0.L|Channel ID |A0.L|Preserved.|
|A1.L|Address of enquiry block|A1.L|Corrupted.|

===== 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.
  * A1.L must point to a four word block which will contain:
    * X-size of window
    * Y-size of window
    * X-position of cursor
    * Y-position of cursor
  * A pending newline is activated by this trap.

===== Example =====
The example below shows the use of this trap call to find the window size and the position of the cursor in pixel coordinates. It is assumed that A0 contains the window's ID.

<code>
enq     moveq   #sd_pxenq,d0    ; $0A
        moveq   #-1,d3          ; Timeout
        lea     ans,a1          ; Address of answer block
        trap    #3              ; Get the information
        tst.l   d0              ; OK? . .
        bne     error           ; . . no!

ans     ds.w    4               ; Space for the answer
</code>

QDOS Internals

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