Wimp_TextOp 1 (changes)
Showing changes from revision #2 to #3:
Added | Removed | Changed
WindowManager
» SWI Calls
» Wimp_TextOp
» Wimp_TextOp (Calculate Width of String)
Wimp_TextOp (Calculate Width of String)
(Reason Code 1)
| Entry | |
|---|---|
| R0 | 1 |
| R1 | Pointer to ctrl-terminated string |
| R2 | Number of Characters to scan, or |
| 0 for whole string |
| Exit | |
|---|---|
| R0 | String width in OS units |
| R1 | Preserved |
| R2 | Preserved |
Use
With a reason code of 1, this call returns the width of a specified string using the current desktop font.
Notes
This is often used prior to plotting a string to an icon, in case the icon needs to be resized.
The value returned is in OS units.
In RO4/6 b31 requests coverage: the maximum of advance width and the bounding box.
See also
Social
Follow us on
and
and
ROOL Store
Buy RISC OS Open merchandise here, including SD cards for Raspberry Pi and more.