JScrollBar (Java 2 Platform SE 5.0) (original) (raw)

javax.swing

Class JScrollBar

java.lang.Object extended by java.awt.Component java.awt.Container javax.swing.JComponent javax.swing.JScrollBar

All Implemented Interfaces:

Adjustable, ImageObserver, MenuContainer, Serializable, Accessible

Direct Known Subclasses:

JScrollPane.ScrollBar

public class JScrollBar

extends JComponent

implements Adjustable, Accessible

An implementation of a scrollbar. The user positions the knob in the scrollbar to determine the contents of the viewing area. The program typically adjusts the display so that the end of the scrollbar represents the end of the displayable contents, or 100% of the contents. The start of the scrollbar is the beginning of the displayable contents, or 0%. The position of the knob within those bounds then translates to the corresponding percentage of the displayable contents.

Typically, as the position of the knob in the scrollbar changes a corresponding change is made to the position of the JViewport on the underlying view, changing the contents of the JViewport.

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:

JScrollPane

Nested Class Summary
protected class	JScrollBar.AccessibleJScrollBar This class implements accessibility support for the JScrollBar class.

Nested classes/interfaces inherited from class javax.swing.JComponent
JComponent.AccessibleJComponent

Nested classes/interfaces inherited from class java.awt.Container
Container.AccessibleAWTContainer

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

Field Summary
protected int	blockIncrement
protected BoundedRangeModel	model The model that represents the scrollbar's minimum, maximum, extent (aka "visibleAmount") and current value.
protected int	orientation
protected int	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
JScrollBar() Creates a vertical scrollbar with the following initial values:
JScrollBar(int orientation) Creates a scrollbar with the specified orientation and the following initial values:
[JScrollBar](../../javax/swing/JScrollBar.html#JScrollBar%28int, int, int, int, int%29)(int orientation, int value, int extent, int min, int max) Creates a scrollbar with the specified orientation, value, extent, minimum, and maximum.

Method Summary
void	addAdjustmentListener(AdjustmentListener l) Adds an AdjustmentListener.
protected void	[fireAdjustmentValueChanged](../../javax/swing/JScrollBar.html#fireAdjustmentValueChanged%28int, int, int%29)(int id, int type, int value)
AccessibleContext	getAccessibleContext() Gets the AccessibleContext associated with this JScrollBar.
AdjustmentListener[]	getAdjustmentListeners() Returns an array of all the AdjustmentListeners added to this JScrollBar with addAdjustmentListener().
int	getBlockIncrement() For backwards compatibility with java.awt.Scrollbar.
int	getBlockIncrement(int direction) Returns the amount to change the scrollbar's value by, given a block (usually "page") up/down request.
int	getMaximum() The maximum value of the scrollbar is maximum - extent.
Dimension	getMaximumSize() The scrollbar is flexible along it's scrolling axis and rigid along the other axis.
int	getMinimum() Returns the minimum value supported by the scrollbar (usually zero).
Dimension	getMinimumSize() The scrollbar is flexible along it's scrolling axis and rigid along the other axis.
BoundedRangeModel	getModel() Returns data model that handles the scrollbar's four fundamental properties: minimum, maximum, value, extent.
int	getOrientation() Returns the component's orientation (horizontal or vertical).
ScrollBarUI	getUI() Returns the delegate that implements the look and feel for this component.
String	getUIClassID() Returns the name of the LookAndFeel class for this component.
int	getUnitIncrement() For backwards compatibility with java.awt.Scrollbar.
int	getUnitIncrement(int direction) Returns the amount to change the scrollbar's value by, given a unit up/down request.
int	getValue() Returns the scrollbar's value.
boolean	getValueIsAdjusting() True if the scrollbar knob is being dragged.
int	getVisibleAmount() Returns the scrollbar's extent, aka its "visibleAmount".
protected String	paramString() Returns a string representation of this JScrollBar.
void	removeAdjustmentListener(AdjustmentListener l) Removes an AdjustmentEvent listener.
void	setBlockIncrement(int blockIncrement) Sets the blockIncrement property.
void	setEnabled(boolean x) Enables the component so that the knob position can be changed.
void	setMaximum(int maximum) Sets the model's maximum property.
void	setMinimum(int minimum) Sets the model's minimum property.
void	setModel(BoundedRangeModel newModel) Sets the model that handles the scrollbar's four fundamental properties: minimum, maximum, value, extent.
void	setOrientation(int orientation) Set the scrollbar's orientation to either VERTICAL or HORIZONTAL.
void	setUI(ScrollBarUI ui) Sets the L&F object that renders this component.
void	setUnitIncrement(int unitIncrement) Sets the unitIncrement property.
void	setValue(int value) Sets the scrollbar's value.
void	setValueIsAdjusting(boolean b) Sets the model's valueIsAdjusting property.
void	[setValues](../../javax/swing/JScrollBar.html#setValues%28int, int, int, int%29)(int newValue, int newExtent, int newMin, int newMax) Sets the four BoundedRangeModel properties after forcing the arguments to obey the usual constraints:
void	setVisibleAmount(int extent) Set the model's extent property.
void	updateUI() Overrides JComponent.updateUI.

Methods inherited from class javax.swing.JComponent
addAncestorListener, addNotify, addVetoableChangeListener, computeVisibleRect, [contains](../../javax/swing/JComponent.html#contains%28int, int%29), createToolTip, disable, enable, [firePropertyChange](../../javax/swing/JComponent.html#firePropertyChange%28java.lang.String, boolean, boolean%29), [firePropertyChange](../../javax/swing/JComponent.html#firePropertyChange%28java.lang.String, char, char%29), [firePropertyChange](../../javax/swing/JComponent.html#firePropertyChange%28java.lang.String, int, int%29), [fireVetoableChange](../../javax/swing/JComponent.html#fireVetoableChange%28java.lang.String, java.lang.Object, java.lang.Object%29), getActionForKeyStroke, getActionMap, getAlignmentX, getAlignmentY, getAncestorListeners, getAutoscrolls, 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, isPaintingTile, isRequestFocusEnabled, isValidateRoot, paint, paintBorder, paintChildren, paintComponent, [paintImmediately](../../javax/swing/JComponent.html#paintImmediately%28int, int, int, int%29), paintImmediately, print, printAll, printBorder, printChildren, printComponent, processComponentKeyEvent, [processKeyBinding](../../javax/swing/JComponent.html#processKeyBinding%28javax.swing.KeyStroke, java.awt.event.KeyEvent, int, boolean%29), processKeyEvent, processMouseEvent, processMouseMotionEvent, [putClientProperty](../../javax/swing/JComponent.html#putClientProperty%28java.lang.Object, java.lang.Object%29), [registerKeyboardAction](../../javax/swing/JComponent.html#registerKeyboardAction%28java.awt.event.ActionListener, javax.swing.KeyStroke, int%29), [registerKeyboardAction](../../javax/swing/JComponent.html#registerKeyboardAction%28java.awt.event.ActionListener, java.lang.String, javax.swing.KeyStroke, int%29), removeAncestorListener, removeNotify, removeVetoableChangeListener, [repaint](../../javax/swing/JComponent.html#repaint%28long, int, int, int, int%29), repaint, requestDefaultFocus, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, resetKeyboardActions, [reshape](../../javax/swing/JComponent.html#reshape%28int, int, int, int%29), revalidate, scrollRectToVisible, setActionMap, setAlignmentX, setAlignmentY, setAutoscrolls, setBackground, setBorder, setComponentPopupMenu, setDebugGraphicsOptions, setDefaultLocale, setDoubleBuffered, [setFocusTraversalKeys](../../javax/swing/JComponent.html#setFocusTraversalKeys%28int, java.util.Set%29), setFont, setForeground, setInheritsPopupMenu, [setInputMap](../../javax/swing/JComponent.html#setInputMap%28int, javax.swing.InputMap%29), setInputVerifier, setMaximumSize, setMinimumSize, setNextFocusableComponent, setOpaque, setPreferredSize, setRequestFocusEnabled, setToolTipText, setTransferHandler, setUI, setVerifyInputWhenFocusTarget, setVisible, unregisterKeyboardAction, update

Methods inherited from class javax.swing.JComponent

addAncestorListener, addNotify, addVetoableChangeListener, computeVisibleRect, [contains](../../javax/swing/JComponent.html#contains%28int, int%29), createToolTip, disable, enable, [firePropertyChange](../../javax/swing/JComponent.html#firePropertyChange%28java.lang.String, boolean, boolean%29), [firePropertyChange](../../javax/swing/JComponent.html#firePropertyChange%28java.lang.String, char, char%29), [firePropertyChange](../../javax/swing/JComponent.html#firePropertyChange%28java.lang.String, int, int%29), [fireVetoableChange](../../javax/swing/JComponent.html#fireVetoableChange%28java.lang.String, java.lang.Object, java.lang.Object%29), getActionForKeyStroke, getActionMap, getAlignmentX, getAlignmentY, getAncestorListeners, getAutoscrolls, 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, isPaintingTile, isRequestFocusEnabled, isValidateRoot, paint, paintBorder, paintChildren, paintComponent, [paintImmediately](../../javax/swing/JComponent.html#paintImmediately%28int, int, int, int%29), paintImmediately, print, printAll, printBorder, printChildren, printComponent, processComponentKeyEvent, [processKeyBinding](../../javax/swing/JComponent.html#processKeyBinding%28javax.swing.KeyStroke, java.awt.event.KeyEvent, int, boolean%29), processKeyEvent, processMouseEvent, processMouseMotionEvent, [putClientProperty](../../javax/swing/JComponent.html#putClientProperty%28java.lang.Object, java.lang.Object%29), [registerKeyboardAction](../../javax/swing/JComponent.html#registerKeyboardAction%28java.awt.event.ActionListener, javax.swing.KeyStroke, int%29), [registerKeyboardAction](../../javax/swing/JComponent.html#registerKeyboardAction%28java.awt.event.ActionListener, java.lang.String, javax.swing.KeyStroke, int%29), removeAncestorListener, removeNotify, removeVetoableChangeListener, [repaint](../../javax/swing/JComponent.html#repaint%28long, int, int, int, int%29), repaint, requestDefaultFocus, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, resetKeyboardActions, [reshape](../../javax/swing/JComponent.html#reshape%28int, int, int, int%29), revalidate, scrollRectToVisible, setActionMap, setAlignmentX, setAlignmentY, setAutoscrolls, setBackground, setBorder, setComponentPopupMenu, setDebugGraphicsOptions, setDefaultLocale, setDoubleBuffered, [setFocusTraversalKeys](../../javax/swing/JComponent.html#setFocusTraversalKeys%28int, java.util.Set%29), setFont, setForeground, setInheritsPopupMenu, [setInputMap](../../javax/swing/JComponent.html#setInputMap%28int, javax.swing.InputMap%29), setInputVerifier, setMaximumSize, setMinimumSize, setNextFocusableComponent, setOpaque, setPreferredSize, setRequestFocusEnabled, setToolTipText, setTransferHandler, setUI, setVerifyInputWhenFocusTarget, setVisible, unregisterKeyboardAction, update

Methods inherited from class java.awt.Container
add, [add](../../java/awt/Container.html#add%28java.awt.Component, int%29), [add](../../java/awt/Container.html#add%28java.awt.Component, java.lang.Object%29), [add](../../java/awt/Container.html#add%28java.awt.Component, java.lang.Object, int%29), [add](../../java/awt/Container.html#add%28java.lang.String, java.awt.Component%29), addContainerListener, [addImpl](../../java/awt/Container.html#addImpl%28java.awt.Component, java.lang.Object, int%29), addPropertyChangeListener, [addPropertyChangeListener](../../java/awt/Container.html#addPropertyChangeListener%28java.lang.String, java.beans.PropertyChangeListener%29), applyComponentOrientation, areFocusTraversalKeysSet, countComponents, deliverEvent, doLayout, [findComponentAt](../../java/awt/Container.html#findComponentAt%28int, int%29), findComponentAt, getComponent, [getComponentAt](../../java/awt/Container.html#getComponentAt%28int, int%29), getComponentAt, getComponentCount, getComponents, getComponentZOrder, getContainerListeners, getFocusTraversalKeys, getFocusTraversalPolicy, getLayout, getMousePosition, insets, invalidate, isAncestorOf, isFocusCycleRoot, isFocusCycleRoot, isFocusTraversalPolicyProvider, isFocusTraversalPolicySet, layout, [list](../../java/awt/Container.html#list%28java.io.PrintStream, int%29), [list](../../java/awt/Container.html#list%28java.io.PrintWriter, int%29), [locate](../../java/awt/Container.html#locate%28int, int%29), minimumSize, paintComponents, preferredSize, printComponents, processContainerEvent, processEvent, remove, remove, removeAll, removeContainerListener, [setComponentZOrder](../../java/awt/Container.html#setComponentZOrder%28java.awt.Component, int%29), setFocusCycleRoot, setFocusTraversalPolicy, setFocusTraversalPolicyProvider, setLayout, transferFocusBackward, transferFocusDownCycle, validate, validateTree

Methods inherited from class java.awt.Container

add, [add](../../java/awt/Container.html#add%28java.awt.Component, int%29), [add](../../java/awt/Container.html#add%28java.awt.Component, java.lang.Object%29), [add](../../java/awt/Container.html#add%28java.awt.Component, java.lang.Object, int%29), [add](../../java/awt/Container.html#add%28java.lang.String, java.awt.Component%29), addContainerListener, [addImpl](../../java/awt/Container.html#addImpl%28java.awt.Component, java.lang.Object, int%29), addPropertyChangeListener, [addPropertyChangeListener](../../java/awt/Container.html#addPropertyChangeListener%28java.lang.String, java.beans.PropertyChangeListener%29), applyComponentOrientation, areFocusTraversalKeysSet, countComponents, deliverEvent, doLayout, [findComponentAt](../../java/awt/Container.html#findComponentAt%28int, int%29), findComponentAt, getComponent, [getComponentAt](../../java/awt/Container.html#getComponentAt%28int, int%29), getComponentAt, getComponentCount, getComponents, getComponentZOrder, getContainerListeners, getFocusTraversalKeys, getFocusTraversalPolicy, getLayout, getMousePosition, insets, invalidate, isAncestorOf, isFocusCycleRoot, isFocusCycleRoot, isFocusTraversalPolicyProvider, isFocusTraversalPolicySet, layout, [list](../../java/awt/Container.html#list%28java.io.PrintStream, int%29), [list](../../java/awt/Container.html#list%28java.io.PrintWriter, int%29), [locate](../../java/awt/Container.html#locate%28int, int%29), minimumSize, paintComponents, preferredSize, printComponents, processContainerEvent, processEvent, remove, remove, removeAll, removeContainerListener, [setComponentZOrder](../../java/awt/Container.html#setComponentZOrder%28java.awt.Component, int%29), setFocusCycleRoot, setFocusTraversalPolicy, setFocusTraversalPolicyProvider, setLayout, transferFocusBackward, transferFocusDownCycle, validate, validateTree

Methods inherited from class java.awt.Component
[action](../../java/awt/Component.html#action%28java.awt.Event, java.lang.Object%29), add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, bounds, [checkImage](../../java/awt/Component.html#checkImage%28java.awt.Image, java.awt.image.ImageObserver%29), [checkImage](../../java/awt/Component.html#checkImage%28java.awt.Image, int, int, java.awt.image.ImageObserver%29), [coalesceEvents](../../java/awt/Component.html#coalesceEvents%28java.awt.AWTEvent, java.awt.AWTEvent%29), contains, createImage, [createImage](../../java/awt/Component.html#createImage%28int, int%29), [createVolatileImage](../../java/awt/Component.html#createVolatileImage%28int, int%29), [createVolatileImage](../../java/awt/Component.html#createVolatileImage%28int, int, java.awt.ImageCapabilities%29), disableEvents, dispatchEvent, enable, enableEvents, enableInputMethods, [firePropertyChange](../../java/awt/Component.html#firePropertyChange%28java.lang.String, byte, byte%29), [firePropertyChange](../../java/awt/Component.html#firePropertyChange%28java.lang.String, double, double%29), [firePropertyChange](../../java/awt/Component.html#firePropertyChange%28java.lang.String, float, float%29), [firePropertyChange](../../java/awt/Component.html#firePropertyChange%28java.lang.String, long, long%29), [firePropertyChange](../../java/awt/Component.html#firePropertyChange%28java.lang.String, java.lang.Object, java.lang.Object%29), [firePropertyChange](../../java/awt/Component.html#firePropertyChange%28java.lang.String, short, short%29), 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, getPeer, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getToolkit, getTreeLock, [gotFocus](../../java/awt/Component.html#gotFocus%28java.awt.Event, java.lang.Object%29), handleEvent, hasFocus, hide, [imageUpdate](../../java/awt/Component.html#imageUpdate%28java.awt.Image, int, int, int, int, int%29), [inside](../../java/awt/Component.html#inside%28int, int%29), isBackgroundSet, isCursorSet, isDisplayable, isEnabled, isFocusable, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, isMaximumSizeSet, isMinimumSizeSet, isPreferredSizeSet, isShowing, isValid, isVisible, [keyDown](../../java/awt/Component.html#keyDown%28java.awt.Event, int%29), [keyUp](../../java/awt/Component.html#keyUp%28java.awt.Event, int%29), list, list, list, location, [lostFocus](../../java/awt/Component.html#lostFocus%28java.awt.Event, java.lang.Object%29), [mouseDown](../../java/awt/Component.html#mouseDown%28java.awt.Event, int, int%29), [mouseDrag](../../java/awt/Component.html#mouseDrag%28java.awt.Event, int, int%29), [mouseEnter](../../java/awt/Component.html#mouseEnter%28java.awt.Event, int, int%29), [mouseExit](../../java/awt/Component.html#mouseExit%28java.awt.Event, int, int%29), [mouseMove](../../java/awt/Component.html#mouseMove%28java.awt.Event, int, int%29), [mouseUp](../../java/awt/Component.html#mouseUp%28java.awt.Event, int, int%29), [move](../../java/awt/Component.html#move%28int, int%29), nextFocus, paintAll, postEvent, [prepareImage](../../java/awt/Component.html#prepareImage%28java.awt.Image, java.awt.image.ImageObserver%29), [prepareImage](../../java/awt/Component.html#prepareImage%28java.awt.Image, int, int, java.awt.image.ImageObserver%29), processComponentEvent, processFocusEvent, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removePropertyChangeListener, [removePropertyChangeListener](../../java/awt/Component.html#removePropertyChangeListener%28java.lang.String, java.beans.PropertyChangeListener%29), repaint, [repaint](../../java/awt/Component.html#repaint%28int, int, int, int%29), repaint, resize, [resize](../../java/awt/Component.html#resize%28int, int%29), [setBounds](../../java/awt/Component.html#setBounds%28int, int, int, int%29), setBounds, setComponentOrientation, setCursor, setDropTarget, setFocusable, setFocusTraversalKeysEnabled, setIgnoreRepaint, setLocale, [setLocation](../../java/awt/Component.html#setLocation%28int, int%29), setLocation, setName, setSize, [setSize](../../java/awt/Component.html#setSize%28int, int%29), show, show, size, toString, transferFocus, transferFocusUpCycle

Methods inherited from class java.awt.Component

[action](../../java/awt/Component.html#action%28java.awt.Event, java.lang.Object%29), add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, bounds, [checkImage](../../java/awt/Component.html#checkImage%28java.awt.Image, java.awt.image.ImageObserver%29), [checkImage](../../java/awt/Component.html#checkImage%28java.awt.Image, int, int, java.awt.image.ImageObserver%29), [coalesceEvents](../../java/awt/Component.html#coalesceEvents%28java.awt.AWTEvent, java.awt.AWTEvent%29), contains, createImage, [createImage](../../java/awt/Component.html#createImage%28int, int%29), [createVolatileImage](../../java/awt/Component.html#createVolatileImage%28int, int%29), [createVolatileImage](../../java/awt/Component.html#createVolatileImage%28int, int, java.awt.ImageCapabilities%29), disableEvents, dispatchEvent, enable, enableEvents, enableInputMethods, [firePropertyChange](../../java/awt/Component.html#firePropertyChange%28java.lang.String, byte, byte%29), [firePropertyChange](../../java/awt/Component.html#firePropertyChange%28java.lang.String, double, double%29), [firePropertyChange](../../java/awt/Component.html#firePropertyChange%28java.lang.String, float, float%29), [firePropertyChange](../../java/awt/Component.html#firePropertyChange%28java.lang.String, long, long%29), [firePropertyChange](../../java/awt/Component.html#firePropertyChange%28java.lang.String, java.lang.Object, java.lang.Object%29), [firePropertyChange](../../java/awt/Component.html#firePropertyChange%28java.lang.String, short, short%29), 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, getPeer, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getToolkit, getTreeLock, [gotFocus](../../java/awt/Component.html#gotFocus%28java.awt.Event, java.lang.Object%29), handleEvent, hasFocus, hide, [imageUpdate](../../java/awt/Component.html#imageUpdate%28java.awt.Image, int, int, int, int, int%29), [inside](../../java/awt/Component.html#inside%28int, int%29), isBackgroundSet, isCursorSet, isDisplayable, isEnabled, isFocusable, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, isMaximumSizeSet, isMinimumSizeSet, isPreferredSizeSet, isShowing, isValid, isVisible, [keyDown](../../java/awt/Component.html#keyDown%28java.awt.Event, int%29), [keyUp](../../java/awt/Component.html#keyUp%28java.awt.Event, int%29), list, list, list, location, [lostFocus](../../java/awt/Component.html#lostFocus%28java.awt.Event, java.lang.Object%29), [mouseDown](../../java/awt/Component.html#mouseDown%28java.awt.Event, int, int%29), [mouseDrag](../../java/awt/Component.html#mouseDrag%28java.awt.Event, int, int%29), [mouseEnter](../../java/awt/Component.html#mouseEnter%28java.awt.Event, int, int%29), [mouseExit](../../java/awt/Component.html#mouseExit%28java.awt.Event, int, int%29), [mouseMove](../../java/awt/Component.html#mouseMove%28java.awt.Event, int, int%29), [mouseUp](../../java/awt/Component.html#mouseUp%28java.awt.Event, int, int%29), [move](../../java/awt/Component.html#move%28int, int%29), nextFocus, paintAll, postEvent, [prepareImage](../../java/awt/Component.html#prepareImage%28java.awt.Image, java.awt.image.ImageObserver%29), [prepareImage](../../java/awt/Component.html#prepareImage%28java.awt.Image, int, int, java.awt.image.ImageObserver%29), processComponentEvent, processFocusEvent, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removePropertyChangeListener, [removePropertyChangeListener](../../java/awt/Component.html#removePropertyChangeListener%28java.lang.String, java.beans.PropertyChangeListener%29), repaint, [repaint](../../java/awt/Component.html#repaint%28int, int, int, int%29), repaint, resize, [resize](../../java/awt/Component.html#resize%28int, int%29), [setBounds](../../java/awt/Component.html#setBounds%28int, int, int, int%29), setBounds, setComponentOrientation, setCursor, setDropTarget, setFocusable, setFocusTraversalKeysEnabled, setIgnoreRepaint, setLocale, [setLocation](../../java/awt/Component.html#setLocation%28int, int%29), setLocation, setName, setSize, [setSize](../../java/awt/Component.html#setSize%28int, int%29), show, show, size, toString, transferFocus, transferFocusUpCycle

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, [wait](../../java/lang/Object.html#wait%28long, int%29)

Field Detail

model

protected BoundedRangeModel model

The model that represents the scrollbar's minimum, maximum, extent (aka "visibleAmount") and current value.

See Also:

setModel(javax.swing.BoundedRangeModel)

orientation

protected int orientation

See Also:

setOrientation(int)

unitIncrement

protected int unitIncrement

See Also:

setUnitIncrement(int)

blockIncrement

protected int blockIncrement

See Also:

setBlockIncrement(int)

Constructor Detail

JScrollBar

public JScrollBar(int orientation, int value, int extent, int min, int max)

Creates a scrollbar with the specified orientation, value, extent, minimum, and maximum. The "extent" is the size of the viewable area. It is also known as the "visible amount".

Note: Use setBlockIncrement to set the block increment to a size slightly smaller than the view's extent. That way, when the user jumps the knob to an adjacent position, one or two lines of the original contents remain in view.

Throws:

[IllegalArgumentException](../../java/lang/IllegalArgumentException.html "class in java.lang") - if orientation is not one of VERTICAL, HORIZONTAL

JScrollBar

public JScrollBar(int orientation)

Creates a scrollbar with the specified orientation and the following initial values:

minimum = 0 maximum = 100 value = 0 extent = 10

JScrollBar

public JScrollBar()

Creates a vertical scrollbar with the following initial values:

minimum = 0 maximum = 100 value = 0 extent = 10

Method Detail

setUI

public void setUI(ScrollBarUI ui)

Sets the L&F object that renders this component.

Parameters:

ui - the ScrollBarUI L&F object

Since:

1.4

getUI

public ScrollBarUI getUI()

Returns the delegate that implements the look and feel for this component.

updateUI

public void updateUI()

Overrides JComponent.updateUI.

Overrides:

[updateUI](../../javax/swing/JComponent.html#updateUI%28%29) in class [JComponent](../../javax/swing/JComponent.html "class in javax.swing")

See Also:

JComponent.updateUI()

getUIClassID

public String getUIClassID()

Returns the name of the LookAndFeel class for this component.

Overrides:

[getUIClassID](../../javax/swing/JComponent.html#getUIClassID%28%29) in class [JComponent](../../javax/swing/JComponent.html "class in javax.swing")

Returns:

"ScrollBarUI"

getOrientation

public int getOrientation()

Returns the component's orientation (horizontal or vertical).

Specified by:

[getOrientation](../../java/awt/Adjustable.html#getOrientation%28%29) in interface [Adjustable](../../java/awt/Adjustable.html "interface in java.awt")

Returns:

VERTICAL or HORIZONTAL

setOrientation

public void setOrientation(int orientation)

Set the scrollbar's orientation to either VERTICAL or HORIZONTAL.

Throws:

[IllegalArgumentException](../../java/lang/IllegalArgumentException.html "class in java.lang") - if orientation is not one of VERTICAL, HORIZONTAL

See Also:

getOrientation()

getModel

public BoundedRangeModel getModel()

Returns data model that handles the scrollbar's four fundamental properties: minimum, maximum, value, extent.

See Also:

setModel(javax.swing.BoundedRangeModel)

setModel

public void setModel(BoundedRangeModel newModel)

Sets the model that handles the scrollbar's four fundamental properties: minimum, maximum, value, extent.

See Also:

getModel()

getUnitIncrement

public int getUnitIncrement(int direction)

Returns the amount to change the scrollbar's value by, given a unit up/down request. A ScrollBarUI implementation typically calls this method when the user clicks on a scrollbar up/down arrow and uses the result to update the scrollbar's value. Subclasses my override this method to compute a value, e.g. the change required to scroll up or down one (variable height) line text or one row in a table.

The JScrollPane component creates scrollbars (by default) that override this method and delegate to the viewports Scrollable view, if it has one. The Scrollable interface provides a more specialized version of this method.

Parameters:

direction - is -1 or 1 for up/down respectively

Returns:

the value of the unitIncrement property

See Also:

setUnitIncrement(int), setValue(int), [Scrollable.getScrollableUnitIncrement(java.awt.Rectangle, int, int)](../../javax/swing/Scrollable.html#getScrollableUnitIncrement%28java.awt.Rectangle, int, int%29)

setUnitIncrement

public void setUnitIncrement(int unitIncrement)

Sets the unitIncrement property.

Note, that if the argument is equal to the value of Integer.MIN_VALUE, the most look and feels will not provide the scrolling to the right/down.

Specified by:

[setUnitIncrement](../../java/awt/Adjustable.html#setUnitIncrement%28int%29) in interface [Adjustable](../../java/awt/Adjustable.html "interface in java.awt")

Parameters:

unitIncrement - the unit increment

See Also:

getUnitIncrement(int)

getBlockIncrement

public int getBlockIncrement(int direction)

Returns the amount to change the scrollbar's value by, given a block (usually "page") up/down request. A ScrollBarUI implementation typically calls this method when the user clicks above or below the scrollbar "knob" to change the value up or down by large amount. Subclasses my override this method to compute a value, e.g. the change required to scroll up or down one paragraph in a text document.

Parameters:

direction - is -1 or 1 for up/down respectively

Returns:

the value of the blockIncrement property

See Also:

setBlockIncrement(int), setValue(int), [Scrollable.getScrollableBlockIncrement(java.awt.Rectangle, int, int)](../../javax/swing/Scrollable.html#getScrollableBlockIncrement%28java.awt.Rectangle, int, int%29)

setBlockIncrement

public void setBlockIncrement(int blockIncrement)

Sets the blockIncrement property.

Note, that if the argument is equal to the value of Integer.MIN_VALUE, the most look and feels will not provide the scrolling to the right/down.

Specified by:

[setBlockIncrement](../../java/awt/Adjustable.html#setBlockIncrement%28int%29) in interface [Adjustable](../../java/awt/Adjustable.html "interface in java.awt")

Parameters:

blockIncrement - the block increment

See Also:

getBlockIncrement()

getUnitIncrement

public int getUnitIncrement()

For backwards compatibility with java.awt.Scrollbar.

Specified by:

[getUnitIncrement](../../java/awt/Adjustable.html#getUnitIncrement%28%29) in interface [Adjustable](../../java/awt/Adjustable.html "interface in java.awt")

Returns:

the unit value increment for the adjustable object

getBlockIncrement

public int getBlockIncrement()

For backwards compatibility with java.awt.Scrollbar.

Specified by:

[getBlockIncrement](../../java/awt/Adjustable.html#getBlockIncrement%28%29) in interface [Adjustable](../../java/awt/Adjustable.html "interface in java.awt")

Returns:

the block value increment for the adjustable object

getValue

public int getValue()

Returns the scrollbar's value.

Specified by:

[getValue](../../java/awt/Adjustable.html#getValue%28%29) in interface [Adjustable](../../java/awt/Adjustable.html "interface in java.awt")

Returns:

the model's value property

See Also:

setValue(int)

setValue

public void setValue(int value)

Sets the scrollbar's value. This method just forwards the value to the model.

Specified by:

[setValue](../../java/awt/Adjustable.html#setValue%28int%29) in interface [Adjustable](../../java/awt/Adjustable.html "interface in java.awt")

Parameters:

value - the current value, between minimum and maximum - visibleAmount

getVisibleAmount

public int getVisibleAmount()

Returns the scrollbar's extent, aka its "visibleAmount". In many scrollbar look and feel implementations the size of the scrollbar "knob" or "thumb" is proportional to the extent.

Specified by:

[getVisibleAmount](../../java/awt/Adjustable.html#getVisibleAmount%28%29) in interface [Adjustable](../../java/awt/Adjustable.html "interface in java.awt")

Returns:

the value of the model's extent property

See Also:

setVisibleAmount(int)

setVisibleAmount

public void setVisibleAmount(int extent)

Set the model's extent property.

Specified by:

[setVisibleAmount](../../java/awt/Adjustable.html#setVisibleAmount%28int%29) in interface [Adjustable](../../java/awt/Adjustable.html "interface in java.awt")

Parameters:

extent - the length of the indicator

getMinimum

public int getMinimum()

Returns the minimum value supported by the scrollbar (usually zero).

Specified by:

[getMinimum](../../java/awt/Adjustable.html#getMinimum%28%29) in interface [Adjustable](../../java/awt/Adjustable.html "interface in java.awt")

Returns:

the value of the model's minimum property

See Also:

setMinimum(int)

setMinimum

public void setMinimum(int minimum)

Sets the model's minimum property.

Specified by:

[setMinimum](../../java/awt/Adjustable.html#setMinimum%28int%29) in interface [Adjustable](../../java/awt/Adjustable.html "interface in java.awt")

Parameters:

minimum - the minimum value

getMaximum

public int getMaximum()

The maximum value of the scrollbar is maximum - extent.

Specified by:

[getMaximum](../../java/awt/Adjustable.html#getMaximum%28%29) in interface [Adjustable](../../java/awt/Adjustable.html "interface in java.awt")

Returns:

the value of the model's maximum property

See Also:

setMaximum(int)

setMaximum

public void setMaximum(int maximum)

Sets the model's maximum property. Note that the scrollbar's value can only be set to maximum - extent.

Specified by:

[setMaximum](../../java/awt/Adjustable.html#setMaximum%28int%29) in interface [Adjustable](../../java/awt/Adjustable.html "interface in java.awt")

Parameters:

maximum - the maximum value

getValueIsAdjusting

public boolean getValueIsAdjusting()

True if the scrollbar knob is being dragged.

Returns:

the value of the model's valueIsAdjusting property

See Also:

setValueIsAdjusting(boolean)

setValueIsAdjusting

public void setValueIsAdjusting(boolean b)

Sets the model's valueIsAdjusting property. Scrollbar look and feel implementations should set this property to true when a knob drag begins, and to false when the drag ends. The scrollbar model will not generate ChangeEvents while valueIsAdjusting is true.

setValues

public void setValues(int newValue, int newExtent, int newMin, int newMax)

Sets the four BoundedRangeModel properties after forcing the arguments to obey the usual constraints:

minimum <= value <= value+extent <= maximum

See Also:

[BoundedRangeModel.setRangeProperties(int, int, int, int, boolean)](../../javax/swing/BoundedRangeModel.html#setRangeProperties%28int, int, int, int, boolean%29), setValue(int), setVisibleAmount(int), setMinimum(int), setMaximum(int)

addAdjustmentListener

public void addAdjustmentListener(AdjustmentListener l)

Adds an AdjustmentListener. Adjustment listeners are notified each time the scrollbar's model changes. Adjustment events are provided for backwards compatibility with java.awt.Scrollbar.

Note that the AdjustmentEvents type property will always have a placeholder value of AdjustmentEvent.TRACK because all changes to a BoundedRangeModels value are considered equivalent. To change the value of a BoundedRangeModel one just sets its value property, i.e. model.setValue(123). No information about the origin of the change, e.g. it's a block decrement, is provided. We don't try fabricate the origin of the change here.

Specified by:

[addAdjustmentListener](../../java/awt/Adjustable.html#addAdjustmentListener%28java.awt.event.AdjustmentListener%29) in interface [Adjustable](../../java/awt/Adjustable.html "interface in java.awt")

Parameters:

l - the AdjustmentLister to add

removeAdjustmentListener

public void removeAdjustmentListener(AdjustmentListener l)

Removes an AdjustmentEvent listener.

Specified by:

[removeAdjustmentListener](../../java/awt/Adjustable.html#removeAdjustmentListener%28java.awt.event.AdjustmentListener%29) in interface [Adjustable](../../java/awt/Adjustable.html "interface in java.awt")

Parameters:

l - the AdjustmentLister to remove

getAdjustmentListeners

public AdjustmentListener[] getAdjustmentListeners()

Returns an array of all the AdjustmentListeners added to this JScrollBar with addAdjustmentListener().

Returns:

all of the AdjustmentListeners added or an empty array if no listeners have been added

Since:

1.4

fireAdjustmentValueChanged

protected void fireAdjustmentValueChanged(int id, int type, int value)

getMinimumSize

public Dimension getMinimumSize()

The scrollbar is flexible along it's scrolling axis and rigid along the other axis.

Overrides:

[getMinimumSize](../../javax/swing/JComponent.html#getMinimumSize%28%29) in class [JComponent](../../javax/swing/JComponent.html "class in javax.swing")

Returns:

the value of the minimumSize property

getMaximumSize

public Dimension getMaximumSize()

The scrollbar is flexible along it's scrolling axis and rigid along the other axis.

Overrides:

[getMaximumSize](../../javax/swing/JComponent.html#getMaximumSize%28%29) in class [JComponent](../../javax/swing/JComponent.html "class in javax.swing")

Returns:

the value of the maximumSize property

setEnabled

public void setEnabled(boolean x)

Enables the component so that the knob position can be changed. When the disabled, the knob position cannot be changed.

Overrides:

[setEnabled](../../javax/swing/JComponent.html#setEnabled%28boolean%29) in class [JComponent](../../javax/swing/JComponent.html "class in javax.swing")

Parameters:

x - a boolean value, where true enables the component and false disables it

paramString

protected String paramString()

Returns a string representation of this JScrollBar. 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](../../javax/swing/JComponent.html#paramString%28%29) in class [JComponent](../../javax/swing/JComponent.html "class in javax.swing")

Returns:

a string representation of this JScrollBar.

getAccessibleContext

public AccessibleContext getAccessibleContext()

Gets the AccessibleContext associated with this JScrollBar. For JScrollBar, the AccessibleContext takes the form of an AccessibleJScrollBar. A new AccessibleJScrollBar instance is created if necessary.

Specified by:

[getAccessibleContext](../../javax/accessibility/Accessible.html#getAccessibleContext%28%29) in interface [Accessible](../../javax/accessibility/Accessible.html "interface in javax.accessibility")

Overrides:

[getAccessibleContext](../../javax/swing/JComponent.html#getAccessibleContext%28%29) in class [JComponent](../../javax/swing/JComponent.html "class in javax.swing")

Returns:

an AccessibleJScrollBar that serves as the AccessibleContext of this JScrollBar

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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.