[ Version ( since = "5.0.3" ) ]
public void set_unknown_color (double red, double green, double blue, double alpha)
Defines the color to be used when this displays an invalid value.
Any value not between 0. and 1. will result in the default hard coded values to be used (grayish).
| this |
a BasicForm widget |
| red |
the red component of a color |
| green |
the green component of a color |
| blue |
the blue component of a color |
| alpha |
the alpha component of a color |