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Java Standard Edition (SE)

AdjustmentEvent


java.awt.event

Class AdjustmentEvent

  • All Implemented Interfaces:
    Serializable


    public class AdjustmentEvent
    extends AWTEvent
    The adjustment event emitted by Adjustable objects like Scrollbar and ScrollPane. When the user changes the value of the scrolling component, it receives an instance of AdjustmentEvent.

    An unspecified behavior will be caused if the id parameter of any particular AdjustmentEvent instance is not in the range from ADJUSTMENT_FIRST to ADJUSTMENT_LAST.

    The type of any AdjustmentEvent instance takes one of the following values:

    • UNIT_INCREMENT
    • UNIT_DECREMENT
    • BLOCK_INCREMENT
    • BLOCK_DECREMENT
    • TRACK
    Assigning the value different from listed above will cause an unspecified behavior.
    Since:
    1.1
    See Also:
    Adjustable, AdjustmentListener, Serialized Form
    • Field Detail

      • ADJUSTMENT_FIRST

        public static final int ADJUSTMENT_FIRST
        Marks the first integer id for the range of adjustment event ids.
        See Also:
        Constant Field Values
      • ADJUSTMENT_LAST

        public static final int ADJUSTMENT_LAST
        Marks the last integer id for the range of adjustment event ids.
        See Also:
        Constant Field Values
      • ADJUSTMENT_VALUE_CHANGED

        public static final int ADJUSTMENT_VALUE_CHANGED
        The adjustment value changed event.
        See Also:
        Constant Field Values
    • Constructor Detail

      • AdjustmentEvent

        public AdjustmentEvent(Adjustable source,
                               int id,
                               int type,
                               int value)
        Constructs an AdjustmentEvent object with the specified Adjustable source, event type, adjustment type, and value.

        This method throws an IllegalArgumentException if source is null.

        Parameters:
        source - The Adjustable object where the event originated
        id - An integer indicating the type of event. For information on allowable values, see the class description for AdjustmentEvent
        type - An integer indicating the adjustment type. For information on allowable values, see the class description for AdjustmentEvent
        value - The current value of the adjustment
        Throws:
        IllegalArgumentException - if source is null
        See Also:
        EventObject.getSource(), AWTEvent.getID(), getAdjustmentType(), getValue()
      • AdjustmentEvent

        public AdjustmentEvent(Adjustable source,
                               int id,
                               int type,
                               int value,
                               boolean isAdjusting)
        Constructs an AdjustmentEvent object with the specified Adjustable source, event type, adjustment type, and value.

        This method throws an IllegalArgumentException if source is null.

        Parameters:
        source - The Adjustable object where the event originated
        id - An integer indicating the type of event. For information on allowable values, see the class description for AdjustmentEvent
        type - An integer indicating the adjustment type. For information on allowable values, see the class description for AdjustmentEvent
        value - The current value of the adjustment
        isAdjusting - A boolean that equals true if the event is one of a series of multiple adjusting events, otherwise false
        Throws:
        IllegalArgumentException - if source is null
        Since:
        1.4
        See Also:
        EventObject.getSource(), AWTEvent.getID(), getAdjustmentType(), getValue(), getValueIsAdjusting()
    • Method Detail

      • getAdjustable

        public Adjustable getAdjustable()
        Returns the Adjustable object where this event originated.
        Returns:
        the Adjustable object where this event originated
      • getValue

        public int getValue()
        Returns the current value in the adjustment event.
        Returns:
        the current value in the adjustment event
      • getValueIsAdjusting

        public boolean getValueIsAdjusting()
        Returns true if this is one of multiple adjustment events.
        Returns:
        true if this is one of multiple adjustment events, otherwise returns false
        Since:
        1.4
      • paramString

        public String paramString()
        Description copied from class: AWTEvent
        Returns a string representing the state of this Event. This method is intended to be used only for debugging purposes, and the content and format of the returned string may vary between implementations. The returned string may be empty but may not be null.
        Overrides:
        paramString in class AWTEvent
        Returns:
        a string representation of this event


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