=> R0 = reason code
0 set text colours
1 calculate width of string
2 plot text
3 get split point
4 truncate
other registers depend on R0
Operations on text in the current desktop font.
See also Wimp_ReadSysInfo with R0 = 8.
Wimp_TextOp 0 (&400F9)
=> R0 = 0 (reason code)
R1 = foreground colour
R2 = background colour
Sets the text colours in the form &BBGGRR00.
Wimp_TextOp 1 (&400F9)
=> R0 = 1 (reason code)
R1 = Pointer to string
R2 = Number of characters to scan, or 0 for whole string
<= R0 = String width in OS units
Calculates the width of a (sub)string, if plotted in the current desktop font. Desktop font can be outline font or old BBC-type font.
Wimp_TextOp 2 (&400F9)
=> R0 = 2 + flags:
/Bit/ /Meaning/
30 Vertically justify, so baseline of characters is at same height as when using system font
31 Right-justify
R1 = Pointer to string
R2 = -1
R3 = -1
R4 = X coordinate
R5 = Y coordinate
Plots a string in the current desktop font.
Wimp_TextOp 3 (&400F9) [5.00]
=> R0 = 3 (reason code)
R1 = pointer to string
R2 = width in OS units
R3 = split character
<= R0 = pointer to split point
all others preserved
Wimp_TextOp 4 (&400F9) [5.00]
=> R0 = 4 (reason code)
R1 = pointer to string
R2 = pointer to output buffer
R3 = buffer size, or 0 to find required size
R4 = maximum width in OS units
<= R0 = required buffer size
all others preserved
This call fills the buffer with the string, truncated if necessary with an ellipsis. Depending on the current alphabet and Wimp font, either an ellipsis character is used, or three full stops.
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