java.lang.Object
java.awt.Component
java.awt.Container
javax.swing.JComponent
javax.swing.JScrollBar
javax.swing.JScrollPane.ScrollBar
- All Implemented Interfaces:
Adjustable
,ImageObserver
,MenuContainer
,Serializable
,Accessible
,UIResource
- Enclosing class:
- JScrollPane
protected class JScrollPane.ScrollBar extends JScrollBar implements UIResource
By default
JScrollPane
creates scrollbars
that are instances
of this class. Scrollbar
overrides the
getUnitIncrement
and getBlockIncrement
methods so that, if the viewport's view is a Scrollable
,
the view is asked to compute these values. Unless
the unit/block increment have been explicitly set.
Warning:
Serialized objects of this class will not be compatible with
future Swing releases. The current serialization support is
appropriate for short term storage or RMI between applications running
the same version of Swing. As of 1.4, support for long term storage
of all JavaBeans
has been added to the java.beans
package.
Please see XMLEncoder
.
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Nested Class Summary
Nested classes/interfaces declared in class javax.swing.JScrollBar
JScrollBar.AccessibleJScrollBar
Nested classes/interfaces declared in class javax.swing.JComponent
JComponent.AccessibleJComponent
Nested classes/interfaces declared in class java.awt.Container
Container.AccessibleAWTContainer
Nested classes/interfaces declared in class java.awt.Component
Component.AccessibleAWTComponent, Component.BaselineResizeBehavior, Component.BltBufferStrategy, Component.FlipBufferStrategy
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Field Summary
Fields declared in class javax.swing.JScrollBar
blockIncrement, model, orientation, unitIncrement
Fields declared in class javax.swing.JComponent
listenerList, TOOL_TIP_TEXT_KEY, ui, UNDEFINED_CONDITION, WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, WHEN_FOCUSED, WHEN_IN_FOCUSED_WINDOW
Fields declared in class java.awt.Component
accessibleContext, BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT
Fields declared in interface java.awt.Adjustable
HORIZONTAL, NO_ORIENTATION, VERTICAL
Fields declared in interface java.awt.image.ImageObserver
ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH
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Constructor Summary
Constructors Constructor Description ScrollBar(int orientation)
Creates a scrollbar with the specified orientation. -
Method Summary
Modifier and Type Method Description int
getBlockIncrement(int direction)
Computes the block increment for scrolling if the viewport's view is aScrollable
object.int
getUnitIncrement(int direction)
Computes the unit increment for scrolling if the viewport's view is aScrollable
object.void
setBlockIncrement(int blockIncrement)
Messages super to set the value, and resets theblockIncrementSet
instance variable to true.void
setUnitIncrement(int unitIncrement)
Messages super to set the value, and resets theunitIncrementSet
instance variable to true.Methods declared in class javax.swing.JScrollBar
addAdjustmentListener, fireAdjustmentValueChanged, getAccessibleContext, getAdjustmentListeners, getBlockIncrement, getMaximum, getMaximumSize, getMinimum, getMinimumSize, getModel, getOrientation, getUI, getUIClassID, getUnitIncrement, getValue, getValueIsAdjusting, getVisibleAmount, paramString, removeAdjustmentListener, setEnabled, setMaximum, setMinimum, setModel, setOrientation, setUI, setValue, setValueIsAdjusting, setValues, setVisibleAmount, 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, hide, isDoubleBuffered, isLightweightComponent, isManagingFocus, isOpaque, isOptimizedDrawingEnabled, isPaintingForPrint, isPaintingOrigin, isPaintingTile, isRequestFocusEnabled, isValidateRoot, paint, paintBorder, paintChildren, paintComponent, paintImmediately, paintImmediately, print, printAll, printBorder, printChildren, printComponent, processComponentKeyEvent, processKeyBinding, processKeyEvent, processMouseEvent, processMouseMotionEvent, putClientProperty, registerKeyboardAction, registerKeyboardAction, removeAncestorListener, removeNotify, removeVetoableChangeListener, repaint, repaint, requestDefaultFocus, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, resetKeyboardActions, reshape, revalidate, scrollRectToVisible, setActionMap, setAlignmentX, setAlignmentY, setAutoscrolls, setBackground, setBorder, setComponentPopupMenu, setDebugGraphicsOptions, setDefaultLocale, setDoubleBuffered, setFocusTraversalKeys, setFont, setForeground, setInheritsPopupMenu, setInputMap, setInputVerifier, setMaximumSize, setMinimumSize, setNextFocusableComponent, setOpaque, setPreferredSize, setRequestFocusEnabled, setToolTipText, setTransferHandler, setUI, setVerifyInputWhenFocusTarget, setVisible, unregisterKeyboardAction, update
Methods declared in class java.awt.Container
add, add, add, add, add, addContainerListener, addImpl, addPropertyChangeListener, addPropertyChangeListener, applyComponentOrientation, areFocusTraversalKeysSet, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getComponentZOrder, getContainerListeners, getFocusTraversalKeys, getFocusTraversalPolicy, getLayout, getMousePosition, insets, invalidate, isAncestorOf, isFocusCycleRoot, isFocusCycleRoot, isFocusTraversalPolicyProvider, isFocusTraversalPolicySet, layout, list, list, locate, minimumSize, paintComponents, preferredSize, printComponents, processContainerEvent, processEvent, remove, remove, removeAll, removeContainerListener, setComponentZOrder, setFocusCycleRoot, setFocusTraversalPolicy, setFocusTraversalPolicyProvider, setLayout, transferFocusDownCycle, validate, validateTree
Methods declared in class java.awt.Component
action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, bounds, checkImage, checkImage, coalesceEvents, contains, createImage, createImage, createVolatileImage, createVolatileImage, disableEvents, dispatchEvent, enable, enableEvents, enableInputMethods, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, getBackground, getBounds, getColorModel, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusCycleRootAncestor, getFocusListeners, getFocusTraversalKeysEnabled, getFont, getForeground, getGraphicsConfiguration, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputContext, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getLocale, getLocation, getLocationOnScreen, getMouseListeners, getMouseMotionListeners, getMousePosition, getMouseWheelListeners, getName, getParent, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getToolkit, getTreeLock, gotFocus, handleEvent, hasFocus, 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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Constructor Details
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ScrollBar
public ScrollBar(int orientation)Creates a scrollbar with the specified orientation. The options are:ScrollPaneConstants.VERTICAL
ScrollPaneConstants.HORIZONTAL
- Parameters:
orientation
- an integer specifying one of the legal orientation values shown above- Since:
- 1.4
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Method Details
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setUnitIncrement
public void setUnitIncrement(int unitIncrement)Messages super to set the value, and resets theunitIncrementSet
instance variable to true.- Specified by:
setUnitIncrement
in interfaceAdjustable
- Overrides:
setUnitIncrement
in classJScrollBar
- Parameters:
unitIncrement
- the new unit increment value, in pixels- See Also:
JScrollBar.getUnitIncrement(int)
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getUnitIncrement
public int getUnitIncrement(int direction)Computes the unit increment for scrolling if the viewport's view is aScrollable
object. Otherwise returnsuper.getUnitIncrement
.- Overrides:
getUnitIncrement
in classJScrollBar
- Parameters:
direction
- less than zero to scroll up/left, greater than zero for down/right- Returns:
- an integer, in pixels, containing the unit increment
- See Also:
Scrollable.getScrollableUnitIncrement(java.awt.Rectangle, int, int)
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setBlockIncrement
public void setBlockIncrement(int blockIncrement)Messages super to set the value, and resets theblockIncrementSet
instance variable to true.- Specified by:
setBlockIncrement
in interfaceAdjustable
- Overrides:
setBlockIncrement
in classJScrollBar
- Parameters:
blockIncrement
- the new block increment value, in pixels- See Also:
JScrollBar.getBlockIncrement()
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getBlockIncrement
public int getBlockIncrement(int direction)Computes the block increment for scrolling if the viewport's view is aScrollable
object. Otherwise theblockIncrement
equals the viewport's width or height. If there's no viewport returnsuper.getBlockIncrement
.- Overrides:
getBlockIncrement
in classJScrollBar
- Parameters:
direction
- less than zero to scroll up/left, greater than zero for down/right- Returns:
- an integer, in pixels, containing the block increment
- See Also:
Scrollable.getScrollableBlockIncrement(java.awt.Rectangle, int, int)
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