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Wimp_TextOp 1
Programmer's Reference Manuals
» Part 7 - The Desktop
» The Window Manager
» 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 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.