A fast and easily customised operating system for ARM devices

Extend Block

+Offset	Contents	Returned Value
+0	Window handle	preserved
+4	Left border width	1 pixel, or
		0 if absent
+8	Bottom border width	horizontal scroll height, or
		1 pixel border, or
		0 if absent
+12	Right border width	vertical scroll width, or
		1 pixel border, or
		0 if absent
+16	Top border width	title bar height, or
		1 pixel border, or
		0 if absent
+20	Back width	0 if absent
+24	Close width	0 if absent
+28	Reserved
+32	Title width	0 if absent, or
		Corrupt if no window handle provided on entry
+36	Reserved
+40	Iconise width	0 if absent. i.e. no close, configure off, or child window
+44	Toggle-size width	0 if absent
+48	Toggle-size height	0 if absent
+52	Vertical scrollbar upper-gap	0 if no vertical scroll bar
+56	Up-arrow height, possibly squashed	0 if no vertical scroll bar
+60	Vertical scroll well height	0 if no vertical scroll bar, or
		Corrupt if no window handle provided on entry
+64	Down-arrow height, possibly squashed	0 if no vertical scroll bar
+68	Vertical scrollbar lower-gap	0 if no vertical scroll bar
+72	Adjust-size or blank height	0 if none
+76	Adjust-size or blank width	0 if none
+80	Horizontal scrollbar right-gap	0 if no horizontal scroll bar
+84	Right-arrow width, possibly squashed	0 if no horizontal scroll bar
+88	Horizontal scroll well width	0 if no horizontal scroll bar, or
		Corrupt if no window handle provided on entry
+92	Left-arrow width, possibly squashed	0 if no horizontal scroll bar
+96	Horizontal scrollbar left-gap	0 if no horizontal scroll bar

This call block is updated using Wimp_Extend with a reason code of 11.

For commercial enquiries, please contact the owners of RISC OS, Castle Technology Ltd.