- java.lang.Object
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- javax.swing.plaf.ComponentUI
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- javax.swing.plaf.ScrollBarUI
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- javax.swing.plaf.basic.BasicScrollBarUI
 
 
 
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- All Implemented Interfaces:
- LayoutManager,- SwingConstants
 - Direct Known Subclasses:
- MetalScrollBarUI,- SynthScrollBarUI
 
 public class BasicScrollBarUI extends ScrollBarUI implements LayoutManager, SwingConstants Implementation of ScrollBarUI for the Basic Look and Feel
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Nested Class SummaryNested Classes Modifier and Type Class Description protected classBasicScrollBarUI.ArrowButtonListenerListener for cursor keys.protected classBasicScrollBarUI.ModelListenerA listener to listen for model changes.classBasicScrollBarUI.PropertyChangeHandlerProperty change handlerprotected classBasicScrollBarUI.ScrollListenerListener for scrolling events initiated in theScrollPane.protected classBasicScrollBarUI.TrackListenerTrack mouse drags.
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Field SummaryFields Modifier and Type Field Description protected BasicScrollBarUI.ArrowButtonListenerbuttonListenerButton listenerprotected JButtondecrButtonDecrement buttonprotected static intDECREASE_HIGHLIGHTDecrease highlightprotected intdecrGapDistance between the decrement button and the track.protected JButtonincrButtonIncrement buttonprotected static intINCREASE_HIGHLIGHTIncrease highlightprotected intincrGapDistance between the increment button and the track.protected booleanisDraggingDraggingprotected DimensionmaximumThumbSizeMaximum thumb sizeprotected DimensionminimumThumbSizeMinimum thumb sizeprotected BasicScrollBarUI.ModelListenermodelListenerModel listenerprotected static intNO_HIGHLIGHTNo highlightprotected PropertyChangeListenerpropertyChangeListenerProperty change listenerprotected JScrollBarscrollbarScrollbarprotected intscrollBarWidthHint as to what width (when vertical) or height (when horizontal) should be.protected BasicScrollBarUI.ScrollListenerscrollListenerScroll listenerprotected TimerscrollTimerScroll timerprotected ColorthumbColorThumb colorprotected ColorthumbDarkShadowColorThumb dark shadow colorprotected ColorthumbHighlightColorThumb highlight colorprotected ColorthumbLightShadowColorThumb light shadow colorprotected RectanglethumbRectThumb rectangleprotected ColortrackColorTrack colorprotected inttrackHighlightTrack highlightprotected ColortrackHighlightColorTrack highlight colorprotected BasicScrollBarUI.TrackListenertrackListenerTrack listenerprotected RectangletrackRectTrack rectangle- 
Fields declared in interface javax.swing.SwingConstantsBOTTOM, CENTER, EAST, HORIZONTAL, LEADING, LEFT, NEXT, NORTH, NORTH_EAST, NORTH_WEST, PREVIOUS, RIGHT, SOUTH, SOUTH_EAST, SOUTH_WEST, TOP, TRAILING, VERTICAL, WEST
 
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Constructor SummaryConstructors Constructor Description BasicScrollBarUI()
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Method SummaryAll Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description protected voidconfigureScrollBarColors()Configures the scroll bar colors.protected BasicScrollBarUI.ArrowButtonListenercreateArrowButtonListener()Creates an arrow button listener.protected JButtoncreateDecreaseButton(int orientation)Creates a decrease button.protected JButtoncreateIncreaseButton(int orientation)Creates an increase button.protected BasicScrollBarUI.ModelListenercreateModelListener()Creates a model listener.protected PropertyChangeListenercreatePropertyChangeListener()Creates a property change listener.protected BasicScrollBarUI.ScrollListenercreateScrollListener()Creates a scroll listener.protected BasicScrollBarUI.TrackListenercreateTrackListener()Creates a track listener.static ComponentUIcreateUI(JComponent c)Creates the UI.DimensiongetMaximumSize(JComponent c)Returns the specified component's maximum size appropriate for the look and feel.protected DimensiongetMaximumThumbSize()Returns the largest acceptable size for the thumb.protected DimensiongetMinimumThumbSize()Returns the smallest acceptable size for the thumb.DimensiongetPreferredSize(JComponent c)A vertical scrollbar's preferred width is the maximum of preferred widths of the (nonnull) increment/decrement buttons, and the minimum width of the thumb.booleangetSupportsAbsolutePositioning()Indicates whether the user can absolutely position the thumb with a mouse gesture (usually the middle mouse button).protected RectanglegetThumbBounds()Return the current size/location of the thumb.protected RectanglegetTrackBounds()Returns the current bounds of the track, i.e. the space in between the increment and decrement buttons, less the insets.protected voidinstallComponents()Installs the components.protected voidinstallDefaults()Installs the defaults.protected voidinstallKeyboardActions()Installs the keyboard actions.protected voidinstallListeners()Installs the listeners.voidinstallUI(JComponent c)Installs the UI.booleanisThumbRollover()Returns true if the mouse is currently over the thumb.protected voidlayoutHScrollbar(JScrollBar sb)Laysouts a vertical scroll bar.protected voidlayoutVScrollbar(JScrollBar sb)Laysouts a vertical scroll bar.protected voidpaintDecreaseHighlight(Graphics g)Paints the decrease highlight.protected voidpaintIncreaseHighlight(Graphics g)Paints the increase highlight.protected voidpaintThumb(Graphics g, JComponent c, Rectangle thumbBounds)Paints the thumb.protected voidpaintTrack(Graphics g, JComponent c, Rectangle trackBounds)Paints the track.protected voidscrollByBlock(int direction)Scrolls by block.protected voidscrollByUnit(int direction)Scrolls by unit.protected voidsetThumbBounds(int x, int y, int width, int height)Set the bounds of the thumb and force a repaint that includes the old thumbBounds and the new one.protected voidsetThumbRollover(boolean active)Sets whether or not the mouse is currently over the thumb.protected voiduninstallComponents()Uninstalls the components.protected voiduninstallDefaults()Uninstalls the defaults.protected voiduninstallKeyboardActions()Uninstalls the keyboard actions.protected voiduninstallListeners()Uninstall the listeners.voiduninstallUI(JComponent c)Uninstalls the UI.- 
Methods declared in class javax.swing.plaf.ComponentUIcontains, getAccessibleChild, getAccessibleChildrenCount, getBaseline, getBaselineResizeBehavior, getMinimumSize, paint, update
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Methods declared in class java.lang.Objectclone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
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Methods declared in interface java.awt.LayoutManageraddLayoutComponent, layoutContainer, minimumLayoutSize, preferredLayoutSize, removeLayoutComponent
 
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Field Detail- 
minimumThumbSizeprotected Dimension minimumThumbSize Minimum thumb size
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maximumThumbSizeprotected Dimension maximumThumbSize Maximum thumb size
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thumbHighlightColorprotected Color thumbHighlightColor Thumb highlight color
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thumbLightShadowColorprotected Color thumbLightShadowColor Thumb light shadow color
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thumbDarkShadowColorprotected Color thumbDarkShadowColor Thumb dark shadow color
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thumbColorprotected Color thumbColor Thumb color
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trackColorprotected Color trackColor Track color
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trackHighlightColorprotected Color trackHighlightColor Track highlight color
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scrollbarprotected JScrollBar scrollbar Scrollbar
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incrButtonprotected JButton incrButton Increment button
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decrButtonprotected JButton decrButton Decrement button
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isDraggingprotected boolean isDragging Dragging
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trackListenerprotected BasicScrollBarUI.TrackListener trackListener Track listener
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buttonListenerprotected BasicScrollBarUI.ArrowButtonListener buttonListener Button listener
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modelListenerprotected BasicScrollBarUI.ModelListener modelListener Model listener
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thumbRectprotected Rectangle thumbRect Thumb rectangle
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trackRectprotected Rectangle trackRect Track rectangle
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trackHighlightprotected int trackHighlight Track highlight
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NO_HIGHLIGHTprotected static final int NO_HIGHLIGHT No highlight- See Also:
- Constant Field Values
 
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DECREASE_HIGHLIGHTprotected static final int DECREASE_HIGHLIGHT Decrease highlight- See Also:
- Constant Field Values
 
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INCREASE_HIGHLIGHTprotected static final int INCREASE_HIGHLIGHT Increase highlight- See Also:
- Constant Field Values
 
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scrollListenerprotected BasicScrollBarUI.ScrollListener scrollListener Scroll listener
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propertyChangeListenerprotected PropertyChangeListener propertyChangeListener Property change listener
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scrollTimerprotected Timer scrollTimer Scroll timer
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scrollBarWidthprotected int scrollBarWidth Hint as to what width (when vertical) or height (when horizontal) should be.- Since:
- 1.7
 
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incrGapprotected int incrGap Distance between the increment button and the track. This may be a negative number. If negative, then an overlap between the button and track will occur, which is useful for shaped buttons.- Since:
- 1.7
 
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decrGapprotected int decrGap Distance between the decrement button and the track. This may be a negative number. If negative, then an overlap between the button and track will occur, which is useful for shaped buttons.- Since:
- 1.7
 
 
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Method Detail- 
createUIpublic static ComponentUI createUI(JComponent c) Creates the UI.- Parameters:
- c- the component
- Returns:
- the UI
 
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configureScrollBarColorsprotected void configureScrollBarColors() Configures the scroll bar colors.
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installUIpublic void installUI(JComponent c) Installs the UI.- Overrides:
- installUIin class- ComponentUI
- Parameters:
- c- the component
- See Also:
- ComponentUI.uninstallUI(javax.swing.JComponent),- JComponent.setUI(javax.swing.plaf.ComponentUI),- JComponent.updateUI()
 
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uninstallUIpublic void uninstallUI(JComponent c) Uninstalls the UI.- Overrides:
- uninstallUIin class- ComponentUI
- Parameters:
- c- the component
- See Also:
- ComponentUI.installUI(javax.swing.JComponent),- JComponent.updateUI()
 
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installDefaultsprotected void installDefaults() Installs the defaults.
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installComponentsprotected void installComponents() Installs the components.
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uninstallComponentsprotected void uninstallComponents() Uninstalls the components.
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installListenersprotected void installListeners() Installs the listeners.
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installKeyboardActionsprotected void installKeyboardActions() Installs the keyboard actions.
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uninstallKeyboardActionsprotected void uninstallKeyboardActions() Uninstalls the keyboard actions.
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uninstallListenersprotected void uninstallListeners() Uninstall the listeners.
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uninstallDefaultsprotected void uninstallDefaults() Uninstalls the defaults.
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createTrackListenerprotected BasicScrollBarUI.TrackListener createTrackListener() Creates a track listener.- Returns:
- a track listener
 
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createArrowButtonListenerprotected BasicScrollBarUI.ArrowButtonListener createArrowButtonListener() Creates an arrow button listener.- Returns:
- an arrow button listener
 
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createModelListenerprotected BasicScrollBarUI.ModelListener createModelListener() Creates a model listener.- Returns:
- a model listener
 
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createScrollListenerprotected BasicScrollBarUI.ScrollListener createScrollListener() Creates a scroll listener.- Returns:
- a scroll listener
 
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createPropertyChangeListenerprotected PropertyChangeListener createPropertyChangeListener() Creates a property change listener.- Returns:
- a property change listener
 
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setThumbRolloverprotected void setThumbRollover(boolean active) Sets whether or not the mouse is currently over the thumb.- Parameters:
- active- True indicates the thumb is currently active.
- Since:
- 1.5
 
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isThumbRolloverpublic boolean isThumbRollover() Returns true if the mouse is currently over the thumb.- Returns:
- true if the thumb is currently active
- Since:
- 1.5
 
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getPreferredSizepublic Dimension getPreferredSize(JComponent c) A vertical scrollbar's preferred width is the maximum of preferred widths of the (nonnull) increment/decrement buttons, and the minimum width of the thumb. The preferred height is the sum of the preferred heights of the same parts. The basis for the preferred size of a horizontal scrollbar is similar.The preferredSizeis only computed once, subsequent calls to this method just return a cached size.- Overrides:
- getPreferredSizein class- ComponentUI
- Parameters:
- c- the- JScrollBarthat's delegating this method to us
- Returns:
- the preferred size of a Basic JScrollBar
- See Also:
- getMaximumSize(javax.swing.JComponent),- ComponentUI.getMinimumSize(javax.swing.JComponent)
 
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getMaximumSizepublic Dimension getMaximumSize(JComponent c) Description copied from class:ComponentUIReturns the specified component's maximum size appropriate for the look and feel. Ifnullis returned, the maximum size will be calculated by the component's layout manager instead (this is the preferred approach for any component with a specific layout manager installed). The default implementation of this method invokesgetPreferredSizeand returns that value.- Overrides:
- getMaximumSizein class- ComponentUI
- Parameters:
- c- The JScrollBar that's delegating this method to us.
- Returns:
- new Dimension(Integer.MAX_VALUE, Integer.MAX_VALUE);
- See Also:
- ComponentUI.getMinimumSize(javax.swing.JComponent),- getPreferredSize(javax.swing.JComponent)
 
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createDecreaseButtonprotected JButton createDecreaseButton(int orientation) Creates a decrease button.- Parameters:
- orientation- the orientation
- Returns:
- a decrease button
 
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createIncreaseButtonprotected JButton createIncreaseButton(int orientation) Creates an increase button.- Parameters:
- orientation- the orientation
- Returns:
- an increase button
 
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paintDecreaseHighlightprotected void paintDecreaseHighlight(Graphics g) Paints the decrease highlight.- Parameters:
- g- the graphics
 
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paintIncreaseHighlightprotected void paintIncreaseHighlight(Graphics g) Paints the increase highlight.- Parameters:
- g- the graphics
 
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paintTrackprotected void paintTrack(Graphics g, JComponent c, Rectangle trackBounds) Paints the track.- Parameters:
- g- the graphics
- c- the component
- trackBounds- the track bounds
 
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paintThumbprotected void paintThumb(Graphics g, JComponent c, Rectangle thumbBounds) Paints the thumb.- Parameters:
- g- the graphics
- c- the component
- thumbBounds- the thumb bounds
 
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getMinimumThumbSizeprotected Dimension getMinimumThumbSize() Returns the smallest acceptable size for the thumb. If the scrollbar becomes so small that this size isn't available, the thumb will be hidden.Warning : the value returned by this method should not be be modified, it's a shared static constant. - Returns:
- The smallest acceptable size for the thumb.
- See Also:
- getMaximumThumbSize()
 
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getMaximumThumbSizeprotected Dimension getMaximumThumbSize() Returns the largest acceptable size for the thumb. To create a fixed size thumb one make this method andgetMinimumThumbSizereturn the same value.Warning : the value returned by this method should not be be modified, it's a shared static constant. - Returns:
- The largest acceptable size for the thumb.
- See Also:
- getMinimumThumbSize()
 
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layoutVScrollbarprotected void layoutVScrollbar(JScrollBar sb) Laysouts a vertical scroll bar.- Parameters:
- sb- the scroll bar
 
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layoutHScrollbarprotected void layoutHScrollbar(JScrollBar sb) Laysouts a vertical scroll bar.- Parameters:
- sb- the scroll bar
 
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setThumbBoundsprotected void setThumbBounds(int x, int y, int width, int height)Set the bounds of the thumb and force a repaint that includes the old thumbBounds and the new one.- Parameters:
- x- set the x location of the thumb
- y- set the y location of the thumb
- width- set the width of the thumb
- height- set the height of the thumb
- See Also:
- getThumbBounds()
 
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getThumbBoundsprotected Rectangle getThumbBounds() Return the current size/location of the thumb.Warning : the value returned by this method should not be be modified, it's a reference to the actual rectangle, not a copy. - Returns:
- The current size/location of the thumb.
- See Also:
- setThumbBounds(int, int, int, int)
 
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getTrackBoundsprotected Rectangle getTrackBounds() Returns the current bounds of the track, i.e. the space in between the increment and decrement buttons, less the insets. The value returned by this method is updated each time the scrollbar is laid out (validated).Warning : the value returned by this method should not be be modified, it's a reference to the actual rectangle, not a copy. - Returns:
- the current bounds of the scrollbar track
- See Also:
- LayoutManager.layoutContainer(java.awt.Container)
 
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scrollByBlockprotected void scrollByBlock(int direction) Scrolls by block.- Parameters:
- direction- the direction to scroll
 
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scrollByUnitprotected void scrollByUnit(int direction) Scrolls by unit.- Parameters:
- direction- the direction to scroll
 
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getSupportsAbsolutePositioningpublic boolean getSupportsAbsolutePositioning() Indicates whether the user can absolutely position the thumb with a mouse gesture (usually the middle mouse button).- Returns:
- true if a mouse gesture can absolutely position the thumb
- Since:
- 1.5
 
 
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