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15.10. Adjuster.__sliderHandler(): Handler for slider changes

This method is called when the user changes the position of any of the color sliders in the ColorSliders widget. It updates the ColorReadout to show the new color. Then it calls this class's callback to inform external observers that the displayed color has changed. See Section 16.3, “ColorReadout.internalSet().

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# - - -   A d j u s t e r . _ _ s l i d e r H a n d l e r

    def __sliderHandler ( self, color ):
        """Notify observers of a change in the color sliders.
        """
        #-- 1 --
        # [ self.__colorReadout  :=  self.__colorReadout displaying
        #       color
        self.__colorReadout.internalSet ( color )

        #-- 2 --
        if  self.__callback is not None:
            self.__callback ( self.isText(), color )