javax.swing
Class JScrollPane.ScrollBar

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

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 viewports 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. A future release of Swing will provide support for long term persistence.

See Also:

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

Inner classes inherited from class javax.swing.JScrollBar

JScrollBar.AccessibleJScrollBar

Inner classes inherited from class javax.swing.JComponent

JComponent.AccessibleJComponent

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

Constructor Summary

JScrollPane.ScrollBar(int orientation)
Create a scrollbar with the specified orientation, where the options are: JScrollPane.VERTICAL_SCROLLBAR JScrollPane.HORIZONTAL_SCROLLBAR

Method Summary

int	getBlockIncrement(int direction) If the viewports view is a Scrollable then ask the view to compute the block increment.
int	getUnitIncrement(int direction) If the viewports view is a Scrollable then ask the view to compute the unit increment.
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, getBlockIncrement, getMaximum, getMaximumSize, getMinimum, getMinimumSize, getModel, getOrientation, getUI, getUIClassID, getUnitIncrement, getValue, getValueIsAdjusting, getVisibleAmount, paramString, removeAdjustmentListener, setEnabled, setMaximum, setMinimum, setModel, setOrientation, setValue, setValueIsAdjusting, setValues, setVisibleAmount, updateUI

Methods inherited from class javax.swing.JComponent

addAncestorListener, addNotify, addPropertyChangeListener, addVetoableChangeListener, computeVisibleRect, contains, createToolTip, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, fireVetoableChange, getActionForKeyStroke, getAlignmentX, getAlignmentY, getAutoscrolls, getBorder, getBounds, getClientProperty, getComponentGraphics, getConditionForKeyStroke, getDebugGraphicsOptions, getGraphics, getHeight, getInsets, getInsets, getLocation, getNextFocusableComponent, getPreferredSize, getRegisteredKeyStrokes, getRootPane, getSize, getToolTipLocation, getToolTipText, getToolTipText, getTopLevelAncestor, getVisibleRect, getWidth, getX, getY, grabFocus, hasFocus, isDoubleBuffered, isFocusCycleRoot, isFocusTraversable, isLightweightComponent, isManagingFocus, isOpaque, isOptimizedDrawingEnabled, isPaintingTile, isRequestFocusEnabled, isValidateRoot, paint, paintBorder, paintChildren, paintComponent, paintImmediately, paintImmediately, processComponentKeyEvent, processFocusEvent, processKeyEvent, processMouseMotionEvent, putClientProperty, registerKeyboardAction, registerKeyboardAction, removeAncestorListener, removeNotify, removePropertyChangeListener, removeVetoableChangeListener, repaint, repaint, requestDefaultFocus, requestFocus, resetKeyboardActions, reshape, revalidate, scrollRectToVisible, setAlignmentX, setAlignmentY, setAutoscrolls, setBackground, setBorder, setDebugGraphicsOptions, setDoubleBuffered, setFont, setForeground, setMaximumSize, setMinimumSize, setNextFocusableComponent, setOpaque, setPreferredSize, setRequestFocusEnabled, setToolTipText, setUI, setVisible, unregisterKeyboardAction, update

Methods inherited from class java.awt.Container

add, add, add, add, add, addContainerListener, addImpl, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getLayout, insets, invalidate, isAncestorOf, layout, list, list, locate, minimumSize, paintComponents, preferredSize, print, printComponents, processContainerEvent, processEvent, remove, remove, removeAll, removeContainerListener, setLayout, validate, validateTree

Methods inherited from class java.awt.Component

action, add, addComponentListener, addFocusListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addPropertyChangeListener, bounds, checkImage, checkImage, coalesceEvents, contains, createImage, createImage, disable, disableEvents, dispatchEvent, enable, enable, enableEvents, enableInputMethods, getBackground, getBounds, getColorModel, getComponentOrientation, getCursor, getDropTarget, getFont, getFontMetrics, getForeground, getInputContext, getInputMethodRequests, getLocale, getLocation, getLocationOnScreen, getName, getParent, getPeer, getSize, getToolkit, getTreeLock, gotFocus, handleEvent, hide, imageUpdate, inside, isDisplayable, isEnabled, isLightweight, isShowing, isValid, isVisible, keyDown, keyUp, list, list, list, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, postEvent, prepareImage, prepareImage, printAll, processComponentEvent, processInputMethodEvent, processMouseEvent, remove, removeComponentListener, removeFocusListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removePropertyChangeListener, repaint, repaint, repaint, resize, resize, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setLocale, setLocation, setLocation, setName, setSize, setSize, show, show, size, toString, transferFocus

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)

Create a scrollbar with the specified orientation, where the options are:

• JScrollPane.VERTICAL_SCROLLBAR
• JScrollPane.HORIZONTAL_SCROLLBAR

Parameters:

orientation - an int specifying the orientation

Method Detail

setUnitIncrement

public void setUnitIncrement(int unitIncrement)

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

Overrides:

setUnitIncrement in class JScrollBar

getUnitIncrement

public int getUnitIncrement(int direction)

If the viewports view is a Scrollable then ask the view to compute the unit increment. Otherwise return super.getUnitIncrement().

Overrides:

getUnitIncrement in class JScrollBar

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.

Overrides:

setBlockIncrement in class JScrollBar

getBlockIncrement

public int getBlockIncrement(int direction)

If the viewports view is a Scrollable then ask the view to compute the block increment. Otherwise the blockIncrement equals the viewports width or height. If there's no viewport reuurn super.getBlockIncrement().

Overrides:

getBlockIncrement in class JScrollBar

See Also:

Scrollable.getScrollableBlockIncrement(java.awt.Rectangle, int, int)