Class JScrollBar

java.lang.Object

vaadinx.awt.Component

vaadinx.awt.Container

vaadinx.swing.JComponent

vaadinx.swing.JScrollBar

All Implemented Interfaces:

Adjustable, ImageObserver, MenuContainer, Serializable, Accessible

public class JScrollBar
extends JComponent
implements Adjustable, Accessible

Emulator for JScrollBar. Per D_viewport_scrollbar_shadows, a shadow JDK component: emulator-only, no surrogate counterpart. Vaadin's Scroller web component owns scrollbar rendering internally — there is no separate Vaadin "scrollbar" object server-side. JScrollBar here exists to give migrated code that calls scrollPane.getVerticalScrollBar().setUnitIncrement(16) a non-null object that round-trips its own state without NPE — a common pattern in L&F-aware migrated code.

Full BoundedRangeModel bookkeeping

The JDK contract treats JScrollBar as a model object with value / minimum / maximum / extent + unitIncrement / blockIncrement. The emulator stores all of these so user code's setters round-trip through their getters.

Listeners stored but never fire

addAdjustmentListener(AdjustmentListener) stores the listener; no Vaadin source fires AdjustmentEvents for scroll position without a custom DOM listener stack (R_match_swing_errors sub-bucket (a) — graduate when a migration target asks).

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected int	blockIncrement
protected BoundedRangeModel	model
protected int	orientation
protected int	unitIncrement

Fields inherited from class JComponent

TOOL_TIP_TEXT_KEY, UNDEFINED_CONDITION, WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, WHEN_FOCUSED, WHEN_IN_FOCUSED_WINDOW

Fields inherited from class Component

BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, FILL_CHROME, FILL_DEFAULT, LEFT_ALIGNMENT, listenerList, RIGHT_ALIGNMENT, TOP_ALIGNMENT

Fields inherited from interface Adjustable

HORIZONTAL, NO_ORIENTATION, VERTICAL

Fields inherited from interface ImageObserver

ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH

Constructor Summary

Constructors

Constructor	Description
JScrollBar()
JScrollBar(int orientation)
JScrollBar(int orientation, int value, int extent, int min, int max)

Method Summary

Modifier and Type	Method	Description
void	addAdjustmentListener(AdjustmentListener l)
AccessibleContext	getAccessibleContext()
AdjustmentListener[]	getAdjustmentListeners()
int	getBlockIncrement()
int	getMaximum()
int	getMinimum()
BoundedRangeModel	getModel()
int	getOrientation()
ScrollBarUI	getUI()
String	getUIClassID()
int	getUnitIncrement()
int	getValue()
boolean	getValueIsAdjusting()
int	getVisibleAmount()
void	removeAdjustmentListener(AdjustmentListener l)
void	setBlockIncrement(int blockIncrement)
void	setMaximum(int maximum)
void	setMinimum(int minimum)
void	setModel(BoundedRangeModel newModel)
void	setOrientation(int orientation)
void	setUI(ScrollBarUI ui)
void	setUnitIncrement(int unitIncrement)
void	setValue(int value)
void	setValueIsAdjusting(boolean adjusting)
void	setValues(int newValue, int newExtent, int newMin, int newMax)	Atomic setter for value / extent / min / max — JDK contract: re-clamps coherently rather than four independent setMinimum/setMaximum/... calls (which can transiently violate invariants).
void	setVisibleAmount(int extent)
void	updateUI()

Methods inherited from class JComponent

addAncestorListener, addNotify, addVetoableChangeListener, computeVisibleRect, contains, createToolTip, disable, enable, firePropertyChange, firePropertyChange, firePropertyChange, fireVetoableChange, getActionForKeyStroke, getActionMap, getAlignmentX, getAlignmentY, getAncestorListeners, getAutoscrolls, getBaseline, getBorder, getBounds, getClientProperty, getComponentGraphics, getComponentPopupMenu, getConditionForKeyStroke, getDebugGraphicsOptions, getDefaultLocale, getFontMetrics, getGraphics, getHeight, getInheritsPopupMenu, getInputMap, getInputMap, getInputVerifier, getInsets, getInsets, getListeners, getLocation, getMaximumSize, getMinimumSize, getNextFocusableComponent, getPopupLocation, getPreferredSize, getRegisteredKeyStrokes, getRootPane, getSize, getToolTipLocation, getToolTipText, getToolTipText, getTopLevelAncestor, getTransferHandler, getVerifyInputWhenFocusTarget, getVetoableChangeListeners, getVisibleRect, getWidth, getX, getY, grabFocus, hide, isDoubleBuffered, isLightweightComponent, isManagingFocus, isOpaque, isOptimizedDrawingEnabled, isPaintingForPrint, isPaintingOrigin, isPaintingTile, isRequestFocusEnabled, isValidateRoot, paint, paintBorder, paintChildren, paintComponent, paintImmediately, paintImmediately, paramString, print, printAll, printBorder, printChildren, printComponent, processComponentKeyEvent, processKeyBinding, 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, setEnabled, setFocusTraversalKeys, setFont, setForeground, setInheritsPopupMenu, setInputMap, setInputVerifier, setMaximumSize, setMinimumSize, setNextFocusableComponent, setOpaque, setPreferredSize, setRequestFocusEnabled, setToolTipText, setTransferHandler, setUI, setVerifyInputWhenFocusTarget, setVisible, unregisterKeyboardAction, update

Methods inherited from class Container

add, add, add, add, add, addContainerListener, addImpl, addPropertyChangeListener, addPropertyChangeListener, addSlotChild, applyComponentOrientation, areFocusTraversalKeysSet, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, fireHierarchyEvent, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getComponentZOrder, getContainerListeners, getFocusTraversalKeys, getFocusTraversalPolicy, getLayout, getMousePosition, insets, invalidate, isAncestorOf, isFocusCycleRoot, isFocusCycleRoot, isFocusTraversalPolicyProvider, isFocusTraversalPolicySet, layout, list, list, locate, minimumSize, paintComponents, peerContentElement, preferredSize, printComponents, processContainerEvent, processEvent, remove, remove, removeAll, removeContainerListener, removeSlotChild, setComponentZOrder, setFocusCycleRoot, setFocusTraversalPolicy, setFocusTraversalPolicyProvider, setLayout, transferFocusDownCycle, validate, validateTree

Methods inherited from class Component

action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, applyBackgroundToPeer, applyVisibleToPeer, awtListeners, bounds, checkImage, checkImage, coalesceEvents, contains, createImage, createImage, createVolatileImage, createVolatileImage, defaultFillCssClass, disableEvents, dispatchEvent, enable, enableEvents, enableInputMethods, fireComponentEvent, 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, getPeer, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getToolkit, getTreeLock, gotFocus, handleEvent, hasFocus, imageUpdate, inside, isBackgroundSet, isCursorSet, isDisplayable, isEnabled, isFocusable, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, isMaximumSizeSet, isMinimumSizeSet, isPreferredSizeSet, isShowing, isThemeDefault, isValid, isVisible, keyDown, keyUp, list, list, list, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, peerIs, postEvent, prepareImage, prepareImage, processComponentEvent, processFocusEvent, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processKeyEvent, processMouseEvent, processMouseMotionEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, resize, resize, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setFocusable, setFocusTraversalKeysEnabled, setIgnoreRepaint, setLocale, setLocation, setLocation, setMixingCutoutShape, setName, setSize, setSize, show, show, size, suppressMouseBridge, toString, transferFocus, transferFocusBackward, transferFocusUpCycle, withPeer, withPeerOnLiveUI

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Details

orientation

protected int orientation

model

protected BoundedRangeModel model

unitIncrement

protected int unitIncrement

blockIncrement

protected int blockIncrement

Constructor Details

JScrollBar

public JScrollBar()

JScrollBar

public JScrollBar(int orientation)

JScrollBar

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

Method Details

getModel

public BoundedRangeModel getModel()

setModel

public void setModel(BoundedRangeModel newModel)

getOrientation

public int getOrientation()

Specified by:

getOrientation in interface Adjustable

setOrientation

public void setOrientation(int orientation)

getValue

public int getValue()

Specified by:

getValue in interface Adjustable

setValue

public void setValue(int value)

Specified by:

setValue in interface Adjustable

getMinimum

public int getMinimum()

Specified by:

getMinimum in interface Adjustable

setMinimum

public void setMinimum(int minimum)

Specified by:

setMinimum in interface Adjustable

getMaximum

public int getMaximum()

Specified by:

getMaximum in interface Adjustable

setMaximum

public void setMaximum(int maximum)

Specified by:

setMaximum in interface Adjustable

getVisibleAmount

public int getVisibleAmount()

Specified by:

getVisibleAmount in interface Adjustable

setVisibleAmount

public void setVisibleAmount(int extent)

Specified by:

setVisibleAmount in interface Adjustable

getUnitIncrement

public int getUnitIncrement()

Specified by:

getUnitIncrement in interface Adjustable

setUnitIncrement

public void setUnitIncrement(int unitIncrement)

Specified by:

setUnitIncrement in interface Adjustable

getBlockIncrement

public int getBlockIncrement()

Specified by:

getBlockIncrement in interface Adjustable

setBlockIncrement

public void setBlockIncrement(int blockIncrement)

Specified by:

setBlockIncrement in interface Adjustable

getValueIsAdjusting

public boolean getValueIsAdjusting()

setValueIsAdjusting

public void setValueIsAdjusting(boolean adjusting)

setValues

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

Atomic setter for value / extent / min / max — JDK contract: re-clamps coherently rather than four independent setMinimum/setMaximum/... calls (which can transiently violate invariants).

addAdjustmentListener

public void addAdjustmentListener(AdjustmentListener l)

Specified by:

addAdjustmentListener in interface Adjustable

removeAdjustmentListener

public void removeAdjustmentListener(AdjustmentListener l)

Specified by:

removeAdjustmentListener in interface Adjustable

getAdjustmentListeners

public AdjustmentListener[] getAdjustmentListeners()

getUIClassID

public String getUIClassID()

Overrides:

getUIClassID in class JComponent

updateUI

public void updateUI()

Overrides:

updateUI in class JComponent

getUI

public ScrollBarUI getUI()

Overrides:

getUI in class JComponent

setUI

public void setUI(ScrollBarUI ui)

getAccessibleContext

public AccessibleContext getAccessibleContext()

Specified by:

getAccessibleContext in interface Accessible

Overrides:

getAccessibleContext in class Component