Module java.desktop

Class EnumControl

  • public abstract class EnumControl
    extends Control
    An EnumControl provides control over a set of discrete possible values, each represented by an object. In a graphical user interface, such a control might be represented by a set of buttons, each of which chooses one value or setting. For example, a reverb control might provide several preset reverberation settings, instead of providing continuously adjustable parameters of the sort that would be represented by FloatControl objects.

    Controls that provide a choice between only two settings can often be implemented instead as a BooleanControl, and controls that provide a set of values along some quantifiable dimension might be implemented instead as a FloatControl with a coarse resolution. However, a key feature of EnumControl is that the returned values are arbitrary objects, rather than numerical or boolean values. This means that each returned object can provide further information. As an example, the settings of a REVERB control are instances of ReverbType that can be queried for the parameter values used for each setting.

    • Constructor Detail

      • EnumControl

        protected EnumControl​(EnumControl.Type type,
                              Object[] values,
                              Object value)
        Constructs a new enumerated control object with the given parameters.
        type - the type of control represented this enumerated control object
        values - the set of possible values for the control
        value - the initial control value
    • Method Detail

      • setValue

        public void setValue​(Object value)
        Sets the current value for the control. The default implementation simply sets the value as indicated. If the value indicated is not supported, an IllegalArgumentException is thrown. Some controls require that their line be open before they can be affected by setting a value.
        value - the desired new value
        IllegalArgumentException - if the value indicated does not fall within the allowable range
      • getValue

        public Object getValue()
        Obtains this control's current value.
        the current value
      • getValues

        public Object[] getValues()
        Returns the set of possible values for this control.
        the set of possible values
      • toString

        public String toString()
        Provides a string representation of the control.
        toString in class Control
        a string description