gtkDcoding Blog Post for 2019-03-29 - Grid

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On Tuesday, 2 April 2019 at 11:31:39 UTC, Ron Tarrant wrote:
> Today's the day for (yet) another blog post over on 
> gtkDcoding.com and the subjects are:
>
> - the RadioButton, and
> - the ColorButton.
>
> You can find it here:
>  
> http://gtkdcoding.com/2019/04/02/0023-radio-and-color-buttons.html

Thank you!

> But if we want one of the others to be active on start-up, as 
> well as syncing up the observed object, we have to call that 
> button’s setActive(true) function. To simplify this two-step 
> process, I broke it out into its own function, 
> setActiveButton().

The function ignores its argument and always uses member variable 
button2 instead. Changing the parameter type to MyRadioButton and 
using 'button' instead of 'button2' in the body works, so you 
could pass another default in RadioBox.this().


Can somebody explain why getRgba() (apparently inherited from 
ColorChooser) does take an out parameter instead of returning an 
Gdk.RGBA?