Java Module java.desktop Package javax.swing Class JScrollPane.ScrollBar（JDK11）

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

All Implemented Interfaces:

Adjustable, ImageObserver, MenuContainer, Serializable, Accessible, 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 JavaBeans™ has been added to the java.beans package. Please see XMLEncoder.

See Also:

Scrollable, JScrollPane.createVerticalScrollBar(), JScrollPane.createHorizontalScrollBar(), Serialized Form

Nested Class Summary
- Nested classes/interfaces declared in class javax.swing.JScrollBar
  JScrollBar.AccessibleJScrollBar
- Nested classes/interfaces declared in class javax.swing.JComponent
  JComponent.AccessibleJComponent
- Nested classes/interfaces declared in class java.awt.Container
  Container.AccessibleAWTContainer
- Nested classes/interfaces declared in class java.awt.Component
  Component.AccessibleAWTComponent, Component.BaselineResizeBehavior, Component.BltBufferStrategy, Component.FlipBufferStrategy

Field Summary
- Fields declared in class javax.swing.JScrollBar
  blockIncrement, model, orientation, unitIncrement
- Fields declared in class javax.swing.JComponent
  listenerList, TOOL_TIP_TEXT_KEY, ui, UNDEFINED_CONDITION, WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, WHEN_FOCUSED, WHEN_IN_FOCUSED_WINDOW
- Fields declared in class java.awt.Component
  accessibleContext, BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT
- Fields declared in interface java.awt.Adjustable
  HORIZONTAL, NO_ORIENTATION, VERTICAL
- Fields declared in interface java.awt.image.ImageObserver
  ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH

Constructor Summary

Constructors
Constructor	Description
`ScrollBar(int orientation)`	Creates a scrollbar with the specified orientation.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`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 declared in class javax.swing.JComponent
addAncestorListener, addNotify, addVetoableChangeListener, computeVisibleRect, contains, createToolTip, disable, enable, firePropertyChange, firePropertyChange, fireVetoableChange, getActionForKeyStroke, getActionMap, getAlignmentX, getAlignmentY, getAncestorListeners, getAutoscrolls, getBaseline, getBaselineResizeBehavior, getBorder, getBounds, getClientProperty, getComponentGraphics, getComponentPopupMenu, getConditionForKeyStroke, getDebugGraphicsOptions, getDefaultLocale, getFontMetrics, getGraphics, getHeight, getInheritsPopupMenu, getInputMap, getInputMap, getInputVerifier, getInsets, getInsets, getListeners, getLocation, getNextFocusableComponent, getPopupLocation, getPreferredSize, getRegisteredKeyStrokes, getRootPane, getSize, getToolTipLocation, getToolTipText, getToolTipText, getTopLevelAncestor, getTransferHandler, getVerifyInputWhenFocusTarget, getVetoableChangeListeners, getVisibleRect, getWidth, getX, getY, grabFocus, isDoubleBuffered, isLightweightComponent, isManagingFocus, isOpaque, isOptimizedDrawingEnabled, isPaintingForPrint, isPaintingOrigin, isPaintingTile, isRequestFocusEnabled, isValidateRoot, paint, paintBorder, paintChildren, paintComponent, paintImmediately, paintImmediately, print, printAll, printBorder, printChildren, printComponent, processComponentKeyEvent, processKeyBinding, processKeyEvent, processMouseEvent, processMouseMotionEvent, putClientProperty, registerKeyboardAction, registerKeyboardAction, removeAncestorListener, removeNotify, removeVetoableChangeListener, repaint, repaint, requestDefaultFocus, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, resetKeyboardActions, reshape, revalidate, scrollRectToVisible, setActionMap, setAlignmentX, setAlignmentY, setAutoscrolls, setBackground, setBorder, setComponentPopupMenu, setDebugGraphicsOptions, setDefaultLocale, setDoubleBuffered, setFocusTraversalKeys, setFont, setForeground, setInheritsPopupMenu, setInputMap, setInputVerifier, setMaximumSize, setMinimumSize, setNextFocusableComponent, setOpaque, setPreferredSize, setRequestFocusEnabled, setToolTipText, setTransferHandler, setUI, setVerifyInputWhenFocusTarget, setVisible, unregisterKeyboardAction, update

Methods declared in class java.awt.Container
add, add, add, add, add, addContainerListener, addImpl, addPropertyChangeListener, addPropertyChangeListener, applyComponentOrientation, areFocusTraversalKeysSet, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getComponentZOrder, getContainerListeners, getFocusTraversalKeys, getFocusTraversalPolicy, getLayout, getMousePosition, insets, invalidate, isAncestorOf, isFocusCycleRoot, isFocusCycleRoot, isFocusTraversalPolicyProvider, isFocusTraversalPolicySet, layout, list, list, locate, minimumSize, paintComponents, preferredSize, printComponents, processContainerEvent, processEvent, remove, remove, removeAll, removeContainerListener, setComponentZOrder, setFocusCycleRoot, setFocusTraversalPolicy, setFocusTraversalPolicyProvider, setLayout, transferFocusDownCycle, validate, validateTree

Methods declared in 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, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, getBackground, getBounds, getColorModel, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusCycleRootAncestor, getFocusListeners, getFocusTraversalKeysEnabled, getFont, getForeground, getGraphicsConfiguration, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputContext, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getLocale, getLocation, getLocationOnScreen, getMouseListeners, getMouseMotionListeners, getMousePosition, getMouseWheelListeners, getName, getParent, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getToolkit, getTreeLock, gotFocus, handleEvent, hasFocus, hide, imageUpdate, inside, isBackgroundSet, isCursorSet, isDisplayable, isEnabled, isFocusable, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, isMaximumSizeSet, isMinimumSizeSet, isPreferredSizeSet, 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, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, requestFocus, requestFocus, requestFocusInWindow, resize, resize, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setFocusable, setFocusTraversalKeysEnabled, setIgnoreRepaint, setLocale, setLocation, setLocation, setMixingCutoutShape, setName, setSize, setSize, show, show, size, toString, transferFocus, transferFocusBackward, transferFocusUpCycle

Methods declared in class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - ScrollBar
```
public ScrollBar(int orientation)
```
    Creates a scrollbar with the specified orientation. The options are:
    
    ScrollPaneConstants.VERTICAL
    
    ScrollPaneConstants.HORIZONTAL
    Parameters:
    
    orientation - an integer specifying one of the legal orientation values shown above
    
    Since:
    
    1.4
- 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)

Java Module java.desktop Package javax.swing Class JScrollPane.ScrollBar（JDK11）

Class JScrollPane.ScrollBar

Nested Class Summary

Nested classes/interfaces declared in class javax.swing.JScrollBar

Nested classes/interfaces declared in class javax.swing.JComponent

Nested classes/interfaces declared in class java.awt.Container

Nested classes/interfaces declared in class java.awt.Component

Field Summary

Fields declared in class javax.swing.JScrollBar

Fields declared in class javax.swing.JComponent

Fields declared in class java.awt.Component

Fields declared in interface java.awt.Adjustable

Fields declared in interface java.awt.image.ImageObserver

Constructor Summary

Method Summary

Methods declared in class javax.swing.JScrollBar

Methods declared in class javax.swing.JComponent

Methods declared in class java.awt.Container

Methods declared in class java.awt.Component

Methods declared in class java.lang.Object

Constructor Detail

ScrollBar

Method Detail

setUnitIncrement

getUnitIncrement

setBlockIncrement

getBlockIncrement