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## javax.swing
Class JScrollPane.ScrollBar

    java.lang.Object
      |
      +--java.awt.Component
            |
            +--java.awt.Container
                  |
                  +--javax.swing.JComponent
                        |
                        +--javax.swing.JScrollBar
                              |
                              +--javax.swing.JScrollPane.ScrollBar

All Implemented Interfaces:
  Accessible, Adjustable, ImageObserver, MenuContainer, Serializable, UIResource

Enclosing class:
  JScrollPane

protected class JScrollPane.ScrollBar
extends JScrollBar
implements UIResource

By default `JScrollPane` creates scrollbars that are instances of this class. `Scrollbar` overrides the `getUnitIncrement` and `getBlockIncrement` methods so that, if the viewport's view is a `Scrollable`, the view is asked to compute these values. Unless the unit/block increment have been explicitly set.

Warning: Serialized objects of this class will not be compatible with future Swing releases. The current serialization support is appropriate for short term storage or RMI between applications running the same version of Swing. As of 1.4, support for long term storage of all JavaBeansTM has been added to the `java.beans` package. Please see `XMLEncoder`.

See Also:
  `Scrollable`, `JScrollPane.createVerticalScrollBar()`, `JScrollPane.createHorizontalScrollBar()`

Nested Class Summary

Nested classes inherited from class javax.swing.JScrollBar
`JScrollBar.AccessibleJScrollBar`

Nested classes inherited from class javax.swing.JComponent
`JComponent.AccessibleJComponent`

Nested classes inherited from class java.awt.Container
`Container.AccessibleAWTContainer`

Nested classes inherited from class java.awt.Component
`Component.AccessibleAWTComponent, Component.BltBufferStrategy, Component.FlipBufferStrategy`

Field Summary

Fields inherited from class javax.swing.JScrollBar
`blockIncrement, model, orientation, unitIncrement`

Fields inherited from class javax.swing.JComponent
`accessibleContext, listenerList, TOOL_TIP_TEXT_KEY, ui, UNDEFINED_CONDITION, WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, WHEN_FOCUSED, WHEN_IN_FOCUSED_WINDOW`

Fields inherited from class java.awt.Component
`BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT`

Fields inherited from interface java.awt.Adjustable
`HORIZONTAL, NO_ORIENTATION, VERTICAL`

Fields inherited from interface java.awt.image.ImageObserver
`ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH`

Constructor Summary
`JScrollPane.ScrollBar(int orientation)` Creates a scrollbar with the specified orientation, where the options are: JScrollPane.VERTICAL JScrollPane.HORIZONTAL

Method Summary
`int` | `getBlockIncrement(int direction)` Computes the block increment for scrolling if the viewport's view is a `Scrollable` object.
`int` | `getUnitIncrement(int direction)` Computes the unit increment for scrolling if the viewport's view is a `Scrollable` object.
`void` | `setBlockIncrement(int blockIncrement)` Messages super to set the value, and resets the `blockIncrementSet` instance variable to true.
`void` | `setUnitIncrement(int unitIncrement)` Messages super to set the value, and resets the `unitIncrementSet` instance variable to true.

Methods inherited from class javax.swing.JScrollBar
`addAdjustmentListener, fireAdjustmentValueChanged, getAccessibleContext, getAdjustmentListeners, getBlockIncrement, getMaximum, getMaximumSize, getMinimum, getMinimumSize, getModel, getOrientation, getUI, getUIClassID, getUnitIncrement, getValue, getValueIsAdjusting, getVisibleAmount, paramString, removeAdjustmentListener, setEnabled, setMaximum, setMinimum, setModel, setOrientation, setUI, setValue, setValueIsAdjusting, setValues, setVisibleAmount, updateUI`

Methods inherited from class javax.swing.JComponent
`addAncestorListener, addNotify, addPropertyChangeListener, addPropertyChangeListener, addVetoableChangeListener, computeVisibleRect, contains, createToolTip, disable, enable, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, fireVetoableChange, getActionForKeyStroke, getActionMap, getAlignmentX, getAlignmentY, getAncestorListeners, getAutoscrolls, getBorder, getBounds, getClientProperty, getComponentGraphics, getConditionForKeyStroke, getDebugGraphicsOptions, getDefaultLocale, getGraphics, getHeight, getInputMap, getInputMap, getInputVerifier, getInsets, getInsets, getListeners, getLocation, getNextFocusableComponent, getPreferredSize, getPropertyChangeListeners, getPropertyChangeListeners, getRegisteredKeyStrokes, getRootPane, getSize, getToolTipLocation, getToolTipText, getToolTipText, getTopLevelAncestor, getTransferHandler, getVerifyInputWhenFocusTarget, getVetoableChangeListeners, getVisibleRect, getWidth, getX, getY, grabFocus, isDoubleBuffered, isLightweightComponent, isManagingFocus, isMaximumSizeSet, isMinimumSizeSet, isOpaque, isOptimizedDrawingEnabled, isPaintingTile, isPreferredSizeSet, isRequestFocusEnabled, isValidateRoot, paint, paintBorder, paintChildren, paintComponent, paintImmediately, paintImmediately, print, printAll, printBorder, printChildren, printComponent, processComponentKeyEvent, processKeyBinding, processKeyEvent, processMouseMotionEvent, putClientProperty, registerKeyboardAction, registerKeyboardAction, removeAncestorListener, removeNotify, removePropertyChangeListener, removePropertyChangeListener, removeVetoableChangeListener, repaint, repaint, requestDefaultFocus, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, resetKeyboardActions, reshape, revalidate, scrollRectToVisible, setActionMap, setAlignmentX, setAlignmentY, setAutoscrolls, setBackground, setBorder, setDebugGraphicsOptions, setDefaultLocale, setDoubleBuffered, setFont, setForeground, setInputMap, setInputVerifier, setMaximumSize, setMinimumSize, setNextFocusableComponent, setOpaque, setPreferredSize, setRequestFocusEnabled, setToolTipText, setTransferHandler, setUI, setVerifyInputWhenFocusTarget, setVisible, unregisterKeyboardAction, update`

Methods inherited from class java.awt.Container
`add, add, add, add, add, addContainerListener, addImpl, applyComponentOrientation, areFocusTraversalKeysSet, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getContainerListeners, getFocusTraversalKeys, getFocusTraversalPolicy, getLayout, insets, invalidate, isAncestorOf, isFocusCycleRoot, isFocusCycleRoot, isFocusTraversalPolicySet, layout, list, list, locate, minimumSize, paintComponents, preferredSize, printComponents, processContainerEvent, processEvent, remove, remove, removeAll, removeContainerListener, setFocusCycleRoot, setFocusTraversalKeys, setFocusTraversalPolicy, setLayout, transferFocusBackward, transferFocusDownCycle, validate, validateTree`

Methods inherited from class java.awt.Component
`action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, bounds, checkImage, checkImage, coalesceEvents, contains, createImage, createImage, createVolatileImage, createVolatileImage, disableEvents, dispatchEvent, enable, enableEvents, enableInputMethods, getBackground, getBounds, getColorModel, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusCycleRootAncestor, getFocusListeners, getFocusTraversalKeysEnabled, getFont, getFontMetrics, getForeground, getGraphicsConfiguration, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputContext, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getLocale, getLocation, getLocationOnScreen, getMouseListeners, getMouseMotionListeners, getMouseWheelListeners, getName, getParent, getPeer, getSize, getToolkit, getTreeLock, gotFocus, handleEvent, hasFocus, hide, imageUpdate, inside, isBackgroundSet, isCursorSet, isDisplayable, isEnabled, isFocusable, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, isShowing, isValid, isVisible, keyDown, keyUp, list, list, list, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, postEvent, prepareImage, prepareImage, processComponentEvent, processFocusEvent, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processMouseEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, repaint, repaint, repaint, resize, resize, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setFocusable, setFocusTraversalKeysEnabled, setIgnoreRepaint, setLocale, setLocation, setLocation, setName, setSize, setSize, show, show, size, toString, transferFocus, transferFocusUpCycle`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Constructor Detail

### JScrollPane.ScrollBar

    public JScrollPane.ScrollBar(int orientation)

  Creates a scrollbar with the specified orientation, where the options are:
  - JScrollPane.VERTICAL
  - JScrollPane.HORIZONTAL

Parameters:
  `orientation` - an integer specifying one of the legal orientation values shown above

Method Detail

### setUnitIncrement

    public void setUnitIncrement(int unitIncrement)

  Messages super to set the value, and resets the `unitIncrementSet` instance variable to true.

  Specified by:
    `setUnitIncrement` in interface `Adjustable`
  Overrides:
    `setUnitIncrement` in class `JScrollBar`
  Parameters:
    `unitIncrement` - the new unit increment value, in pixels
  See Also:
    `JScrollBar.getUnitIncrement(int)`

### getUnitIncrement

    public int getUnitIncrement(int direction)

  Computes the unit increment for scrolling if the viewport's view is a `Scrollable` object. Otherwise return `super.getUnitIncrement`.

  Overrides:
    `getUnitIncrement` in class `JScrollBar`
  Parameters:
    `direction` - less than zero to scroll up/left, greater than zero for down/right
  Returns:
    an integer, in pixels, containing the unit increment
  See Also:
    `Scrollable.getScrollableUnitIncrement(java.awt.Rectangle, int, int)`

### setBlockIncrement

    public void setBlockIncrement(int blockIncrement)

  Messages super to set the value, and resets the `blockIncrementSet` instance variable to true.

  Specified by:
    `setBlockIncrement` in interface `Adjustable`
  Overrides:
    `setBlockIncrement` in class `JScrollBar`
  Parameters:
    `blockIncrement` - the new block increment value, in pixels
  See Also:
    `JScrollBar.getBlockIncrement()`

### getBlockIncrement

    public int getBlockIncrement(int direction)

  Computes the block increment for scrolling if the viewport's view is a `Scrollable` object. Otherwise the `blockIncrement` equals the viewport's width or height. If there's no viewport return `super.getBlockIncrement`.

  Overrides:
    `getBlockIncrement` in class `JScrollBar`
  Parameters:
    `direction` - less than zero to scroll up/left, greater than zero for down/right
  Returns:
    an integer, in pixels, containing the block increment
  See Also:
    `Scrollable.getScrollableBlockIncrement(java.awt.Rectangle, int, int)`

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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.