- java.lang.Object
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- java.awt.Component
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- java.awt.Container
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- javax.swing.JComponent
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- javax.swing.JScrollBar
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- All Implemented Interfaces:
Adjustable,ImageObserver,MenuContainer,Serializable,Accessible
- Direct Known Subclasses:
JScrollPane.ScrollBar
@JavaBean(defaultProperty="UI", description="A component that helps determine the visible content range of an area.") 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: Swing is not thread safe. For more information see Swing's Threading Policy.
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.beanspackage. Please seeXMLEncoder.- Since:
- 1.2
- See Also:
JScrollPane, Serialized Form
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Nested Class Summary
Nested Classes Modifier and Type Class Description protected classJScrollBar.AccessibleJScrollBarThis class implements accessibility support for theJScrollBarclass.-
Nested classes/interfaces declared in class javax.swing.JComponent
JComponent.AccessibleJComponent
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Nested classes/interfaces declared in class java.awt.Container
Container.AccessibleAWTContainer
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Nested classes/interfaces declared in class java.awt.Component
Component.AccessibleAWTComponent, Component.BaselineResizeBehavior, Component.BltBufferStrategy, Component.FlipBufferStrategy
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Field Summary
Fields Modifier and Type Field Description protected intblockIncrementprotected BoundedRangeModelmodelThe model that represents the scrollbar's minimum, maximum, extent (aka "visibleAmount") and current value.protected intorientationprotected intunitIncrement-
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
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Fields declared in class java.awt.Component
accessibleContext, BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT
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Fields declared in interface java.awt.Adjustable
HORIZONTAL, NO_ORIENTATION, VERTICAL
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Fields declared in interface java.awt.image.ImageObserver
ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH
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Constructor Summary
Constructors Constructor Description 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(int orientation, int value, int extent, int min, int max)Creates a scrollbar with the specified orientation, value, extent, minimum, and maximum.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description voidaddAdjustmentListener(AdjustmentListener l)Adds an AdjustmentListener.protected voidfireAdjustmentValueChanged(int id, int type, int value)Notify listeners that the scrollbar's model has changed.AccessibleContextgetAccessibleContext()Gets the AccessibleContext associated with this JScrollBar.AdjustmentListener[]getAdjustmentListeners()Returns an array of all theAdjustmentListeners added to this JScrollBar with addAdjustmentListener().intgetBlockIncrement()For backwards compatibility with java.awt.Scrollbar.intgetBlockIncrement(int direction)Returns the amount to change the scrollbar's value by, given a block (usually "page") up/down request.intgetMaximum()The maximum value of the scrollbar is maximum - extent.DimensiongetMaximumSize()The scrollbar is flexible along it's scrolling axis and rigid along the other axis.intgetMinimum()Returns the minimum value supported by the scrollbar (usually zero).DimensiongetMinimumSize()The scrollbar is flexible along it's scrolling axis and rigid along the other axis.BoundedRangeModelgetModel()Returns data model that handles the scrollbar's four fundamental properties: minimum, maximum, value, extent.intgetOrientation()Returns the component's orientation (horizontal or vertical).ScrollBarUIgetUI()Returns the delegate that implements the look and feel for this component.StringgetUIClassID()Returns the name of the LookAndFeel class for this component.intgetUnitIncrement()For backwards compatibility with java.awt.Scrollbar.intgetUnitIncrement(int direction)Returns the amount to change the scrollbar's value by, given a unit up/down request.intgetValue()Returns the scrollbar's value.booleangetValueIsAdjusting()True if the scrollbar knob is being dragged.intgetVisibleAmount()Returns the scrollbar's extent, aka its "visibleAmount".protected StringparamString()Returns a string representation of this JScrollBar.voidremoveAdjustmentListener(AdjustmentListener l)Removes an AdjustmentEvent listener.voidsetBlockIncrement(int blockIncrement)Sets the blockIncrement property.voidsetEnabled(boolean x)Enables the component so that the knob position can be changed.voidsetMaximum(int maximum)Sets the model's maximum property.voidsetMinimum(int minimum)Sets the model's minimum property.voidsetModel(BoundedRangeModel newModel)Sets the model that handles the scrollbar's four fundamental properties: minimum, maximum, value, extent.voidsetOrientation(int orientation)Set the scrollbar's orientation to either VERTICAL or HORIZONTAL.voidsetUI(ScrollBarUI ui)Sets the L&F object that renders this component.voidsetUnitIncrement(int unitIncrement)Sets the unitIncrement property.voidsetValue(int value)Sets the scrollbar's value.voidsetValueIsAdjusting(boolean b)Sets the model's valueIsAdjusting property.voidsetValues(int newValue, int newExtent, int newMin, int newMax)Sets the four BoundedRangeModel properties after forcing the arguments to obey the usual constraints:voidsetVisibleAmount(int extent)Set the model's extent property.voidupdateUI()OverridesJComponent.updateUI.-
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
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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
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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
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Field Detail
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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)
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orientation
protected int orientation
- See Also:
setOrientation(int)
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unitIncrement
protected int unitIncrement
- See Also:
setUnitIncrement(int)
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blockIncrement
protected int blockIncrement
- See Also:
setBlockIncrement(int)
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Constructor Detail
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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
setBlockIncrementto 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.- Parameters:
orientation- an orientation of theJScrollBarvalue- an int giving the current valueextent- an int giving the amount by which the value can "jump"min- an int giving the minimum valuemax- an int giving the maximum value- Throws:
IllegalArgumentException- if orientation is not one of VERTICAL, HORIZONTAL- See Also:
setOrientation(int),setValue(int),setVisibleAmount(int),setMinimum(int),setMaximum(int)
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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
- Parameters:
orientation- an orientation of theJScrollBar
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JScrollBar
public JScrollBar()
Creates a vertical scrollbar with the following initial values:minimum = 0 maximum = 100 value = 0 extent = 10
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Method Detail
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setUI
@BeanProperty(hidden=true, visualUpdate=true, description="The UI object that implements the Component\'s LookAndFeel") public void setUI(ScrollBarUI ui)
Sets the L&F object that renders this component.- Parameters:
ui- theScrollBarUIL&F object- Since:
- 1.4
- See Also:
UIDefaults.getUI(javax.swing.JComponent)
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getUI
public ScrollBarUI getUI()
Returns the delegate that implements the look and feel for this component.- Overrides:
getUIin classJComponent- Returns:
- the scroll bar's current UI.
- See Also:
JComponent.setUI(javax.swing.plaf.ComponentUI)
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updateUI
public void updateUI()
OverridesJComponent.updateUI.- Overrides:
updateUIin classJComponent- See Also:
JComponent.updateUI()
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getUIClassID
@BeanProperty(bound=false) public String getUIClassID()
Returns the name of the LookAndFeel class for this component.- Overrides:
getUIClassIDin classJComponent- Returns:
- "ScrollBarUI"
- See Also:
JComponent.getUIClassID(),UIDefaults.getUI(javax.swing.JComponent)
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getOrientation
public int getOrientation()
Returns the component's orientation (horizontal or vertical).- Specified by:
getOrientationin interfaceAdjustable- Returns:
- VERTICAL or HORIZONTAL
- See Also:
setOrientation(int),Adjustable.getOrientation()
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setOrientation
@BeanProperty(preferred=true, visualUpdate=true, enumerationValues={"JScrollBar.VERTICAL","JScrollBar.HORIZONTAL"}, description="The scrollbar\'s orientation.") public void setOrientation(int orientation)
Set the scrollbar's orientation to either VERTICAL or HORIZONTAL.- Parameters:
orientation- an orientation of theJScrollBar- Throws:
IllegalArgumentException- if orientation is not one of VERTICAL, HORIZONTAL- See Also:
getOrientation()
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getModel
public BoundedRangeModel getModel()
Returns data model that handles the scrollbar's four fundamental properties: minimum, maximum, value, extent.- Returns:
- the data model
- See Also:
setModel(javax.swing.BoundedRangeModel)
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setModel
@BeanProperty(expert=true, description="The scrollbar\'s BoundedRangeModel.") public void setModel(BoundedRangeModel newModel)
Sets the model that handles the scrollbar's four fundamental properties: minimum, maximum, value, extent.- Parameters:
newModel- a new model- See Also:
getModel()
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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.
Some look and feels implement custom scrolling behavior and ignore this property.
- 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)
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setUnitIncrement
@BeanProperty(preferred=true, description="The scrollbar\'s unit increment.") 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.
Some look and feels implement custom scrolling behavior and ignore this property.
- Specified by:
setUnitIncrementin interfaceAdjustable- Parameters:
unitIncrement- the unit increment- See Also:
getUnitIncrement(int)
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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.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.
Some look and feels implement custom scrolling behavior and ignore this property.
- 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)
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setBlockIncrement
@BeanProperty(preferred=true, description="The scrollbar\'s block increment.") 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.
Some look and feels implement custom scrolling behavior and ignore this property.
- Specified by:
setBlockIncrementin interfaceAdjustable- Parameters:
blockIncrement- the block increment- See Also:
getBlockIncrement()
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getUnitIncrement
public int getUnitIncrement()
For backwards compatibility with java.awt.Scrollbar.- Specified by:
getUnitIncrementin interfaceAdjustable- Returns:
- the unit value increment for the adjustable object
- See Also:
Adjustable.getUnitIncrement(),getUnitIncrement(int)
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getBlockIncrement
public int getBlockIncrement()
For backwards compatibility with java.awt.Scrollbar.- Specified by:
getBlockIncrementin interfaceAdjustable- Returns:
- the block value increment for the adjustable object
- See Also:
Adjustable.getBlockIncrement(),getBlockIncrement(int)
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getValue
public int getValue()
Returns the scrollbar's value.- Specified by:
getValuein interfaceAdjustable- Returns:
- the model's value property
- See Also:
setValue(int)
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setValue
@BeanProperty(bound=false, preferred=true, description="The scrollbar\'s current value.") public void setValue(int value)
Sets the scrollbar's value. This method just forwards the value to the model.- Specified by:
setValuein interfaceAdjustable- Parameters:
value- the current value, betweenminimumandmaximum-visibleAmount- See Also:
getValue(),BoundedRangeModel.setValue(int)
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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:
getVisibleAmountin interfaceAdjustable- Returns:
- the value of the model's extent property
- See Also:
setVisibleAmount(int)
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setVisibleAmount
@BeanProperty(bound=false, preferred=true, description="The amount of the view that is currently visible.") public void setVisibleAmount(int extent)
Set the model's extent property.- Specified by:
setVisibleAmountin interfaceAdjustable- Parameters:
extent- the length of the indicator- See Also:
getVisibleAmount(),BoundedRangeModel.setExtent(int)
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getMinimum
public int getMinimum()
Returns the minimum value supported by the scrollbar (usually zero).- Specified by:
getMinimumin interfaceAdjustable- Returns:
- the value of the model's minimum property
- See Also:
setMinimum(int)
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setMinimum
@BeanProperty(bound=false, preferred=true, description="The scrollbar\'s minimum value.") public void setMinimum(int minimum)
Sets the model's minimum property.- Specified by:
setMinimumin interfaceAdjustable- Parameters:
minimum- the minimum value- See Also:
getMinimum(),BoundedRangeModel.setMinimum(int)
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getMaximum
public int getMaximum()
The maximum value of the scrollbar is maximum - extent.- Specified by:
getMaximumin interfaceAdjustable- Returns:
- the value of the model's maximum property
- See Also:
setMaximum(int)
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setMaximum
@BeanProperty(bound=false, preferred=true, description="The scrollbar\'s maximum value.") 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:
setMaximumin interfaceAdjustable- Parameters:
maximum- the maximum value- See Also:
getMaximum(),BoundedRangeModel.setMaximum(int)
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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)
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setValueIsAdjusting
@BeanProperty(bound=false, expert=true, description="True if the scrollbar thumb is being dragged.") 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.- Parameters:
b-trueif the upcoming changes to the value property are part of a series- See Also:
getValueIsAdjusting(),BoundedRangeModel.setValueIsAdjusting(boolean)
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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
- Parameters:
newValue- an int giving the current valuenewExtent- an int giving the amount by which the value can "jump"newMin- an int giving the minimum valuenewMax- an int giving the maximum value- See Also:
BoundedRangeModel.setRangeProperties(int, int, int, int, boolean),setValue(int),setVisibleAmount(int),setMinimum(int),setMaximum(int)
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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:
addAdjustmentListenerin interfaceAdjustable- Parameters:
l- the AdjustmentLister to add- See Also:
removeAdjustmentListener(java.awt.event.AdjustmentListener),BoundedRangeModel.addChangeListener(javax.swing.event.ChangeListener)
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removeAdjustmentListener
public void removeAdjustmentListener(AdjustmentListener l)
Removes an AdjustmentEvent listener.- Specified by:
removeAdjustmentListenerin interfaceAdjustable- Parameters:
l- the AdjustmentLister to remove- See Also:
addAdjustmentListener(java.awt.event.AdjustmentListener)
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getAdjustmentListeners
@BeanProperty(bound=false) public AdjustmentListener[] getAdjustmentListeners()
Returns an array of all theAdjustmentListeners 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
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fireAdjustmentValueChanged
protected void fireAdjustmentValueChanged(int id, int type, int value)Notify listeners that the scrollbar's model has changed.- Parameters:
id- an integer indicating the type of event.type- an integer indicating the adjustment type.value- the current value of the adjustment- See Also:
addAdjustmentListener(java.awt.event.AdjustmentListener),EventListenerList
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getMinimumSize
public Dimension getMinimumSize()
The scrollbar is flexible along it's scrolling axis and rigid along the other axis.- Overrides:
getMinimumSizein classJComponent- Returns:
- the value of the
minimumSizeproperty - See Also:
JComponent.setMinimumSize(java.awt.Dimension),ComponentUI
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getMaximumSize
public Dimension getMaximumSize()
The scrollbar is flexible along it's scrolling axis and rigid along the other axis.- Overrides:
getMaximumSizein classJComponent- Returns:
- the value of the
maximumSizeproperty - See Also:
JComponent.setMaximumSize(java.awt.Dimension),ComponentUI
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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:
setEnabledin classJComponent- Parameters:
x- a boolean value, where true enables the component and false disables it- See Also:
Component.isEnabled(),Component.isLightweight()
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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 benull.- Overrides:
paramStringin classJComponent- Returns:
- a string representation of this JScrollBar.
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getAccessibleContext
@BeanProperty(bound=false) 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:
getAccessibleContextin interfaceAccessible- Overrides:
getAccessibleContextin classComponent- Returns:
- an AccessibleJScrollBar that serves as the AccessibleContext of this JScrollBar
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