Button operators

getButtonClick :: Button a -> IO a

setButtonLabel :: Button a -> Picture -> IO a

change the current label for the button.

combineButtons :: Button a -> IO (Button a)

merge a set of buttons together, such that button clicks that are reported to any of the combined buttons are forwarded to the combined button.

mapButton :: (a->b) -> Button a -> Button b

returns a new button which for every value output by an existing button apply a function to its output.

disableButton :: Button a -> IO ()

disable interaction with the user.

enableButton :: Button a -> IO ()

if disabled, enable interaction again.

nameButton :: SelectorName -> Button a -> Button a

return a button value with a new name.