=> R0 = flags
R1 = pointer to block (if flags b0 or b1 set)
<= R0 = new flags
This call controls how the Wimp automatically scrolls an application's windows.
Wimp_AutoScroll block
Offset Meaning
0 Window handle of window to scroll
4 Left pause zone width
8 Bottom pause zone height
12 Right pause zone width
16 Top pause zone height
20 Pause duration in centiseconds
-1 configured pause length
0 no pause
Other duration in cs
24 State change handler:
0 none
1 use Wimp's pointer shape routine
> 1 pointer to a routine.
28 Value to pass in R12 to state change handler routine (if applicable)
Zone sizes are in OS units, and are ignored unless the relevent flag bit is set. A sensible default for these is 80.
Wimp_AutoScroll R0 entry flags
Bit Meaning when set
0 Enable horizontal autoscrolling
1 Enable vertical autoscrolling
2 Delegate window repositioning to task (send Scroll_Requests rather than Open_Window_Requests
7 Just read the current states of all flags.
Other bits are reserved.
Wimp_AutoScroll exit flags
Bits Meaning when set
0-2 are preserved or read, according to bit 7 on entry.
7 is cleared
8 Autoscrolling has commenced (this bit is set after a pause is completed, and remains set when a scroll has "hit the stops", but is cleared again when the pointer re-enters the centre zone)
9 Pointer is outside the window's visible area
10 Pointer is within one or two pause zones
11 Pointer is within the centre zone
12 Pointer is left of the centre zone
13 Pointer is below the centre zone
14 Pointer is right of the centre zone
15 Pointer is above the centre zone
16 There is work area to the left of the visible area (always cleared if bit 0 is clear)
17 There is work area below the visible area (always cleared if bit 1 is clear)
18 There is work area to the right of the visible area (always cleared if bit 0 is clear)
19 There is work area above the visible area (always cleared if bit 1 is clear)
Other bits must be ignored.
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