Class MetalScrollBarUI

java.lang.Object

javax.swing.plaf.ComponentUI

javax.swing.plaf.ScrollBarUI

javax.swing.plaf.basic.BasicScrollBarUI

javax.swing.plaf.metal.MetalScrollBarUI

All Implemented Interfaces:

LayoutManager, SwingConstants

public class MetalScrollBarUI
extends BasicScrollBarUI

Implementation of ScrollBarUI for the Metal Look and Feel

Nested Class Summary

Nested classes/interfaces inherited from class javax.swing.plaf.basic.BasicScrollBarUI

BasicScrollBarUI.ArrowButtonListener, BasicScrollBarUI.ModelListener, BasicScrollBarUI.PropertyChangeHandler, BasicScrollBarUI.ScrollListener, BasicScrollBarUI.TrackListener

Field Summary

Fields

Modifier and Type	Field	Description
protected MetalScrollButton	decreaseButton	The decrease button.
static final String	FREE_STANDING_PROP	The property JScrollBar.isFreeStanding.
protected MetalScrollButton	increaseButton	The increase button.
protected boolean	isFreeStanding	The value of the property JScrollBar.isFreeStanding.
protected int	scrollBarWidth	The width of the scroll bar.

Fields inherited from class javax.swing.plaf.basic.BasicScrollBarUI

buttonListener, decrButton, DECREASE_HIGHLIGHT, decrGap, incrButton, INCREASE_HIGHLIGHT, incrGap, isDragging, maximumThumbSize, minimumThumbSize, modelListener, NO_HIGHLIGHT, propertyChangeListener, scrollbar, scrollListener, scrollTimer, thumbDarkShadowColor, thumbLightShadowColor, thumbRect, trackColor, trackHighlight, trackHighlightColor, trackListener, trackRect

Fields inherited from interface javax.swing.SwingConstants

BOTTOM, CENTER, EAST, HORIZONTAL, LEADING, LEFT, NEXT, NORTH, NORTH_EAST, NORTH_WEST, PREVIOUS, RIGHT, SOUTH, SOUTH_EAST, SOUTH_WEST, TOP, TRAILING, VERTICAL, WEST

Constructor Summary

Constructors

Constructor	Description
MetalScrollBarUI()	Constructs a MetalScrollBarUI.

Method Summary

Modifier and Type	Method	Description
protected void	configureScrollBarColors()	Configures the scroll bar colors.
protected JButton	createDecreaseButton(int orientation)	Returns the view that represents the decrease view.
protected JButton	createIncreaseButton(int orientation)	Returns the view that represents the increase view.
protected PropertyChangeListener	createPropertyChangeListener()	Creates a property change listener.
static ComponentUI	createUI(JComponent c)	Constructs a new MetalScrollBarUI instance.
protected Dimension	getMinimumThumbSize()	Returns the smallest acceptable size for the thumb.
Dimension	getPreferredSize(JComponent c)	A vertical scrollbar's preferred width is the maximum of preferred widths of the (non null) increment/decrement buttons, and the minimum width of the thumb.
protected void	installDefaults()	Installs the defaults.
protected void	installListeners()	Installs the listeners.
protected void	paintThumb(Graphics g, JComponent c, Rectangle thumbBounds)	Paints the thumb.
protected void	paintTrack(Graphics g, JComponent c, Rectangle trackBounds)	Paints the track.
protected void	setThumbBounds(int x, int y, int width, int height)	This is overridden only to increase the invalid area.

Methods inherited from class javax.swing.plaf.basic.BasicScrollBarUI

addLayoutComponent, createArrowButtonListener, createModelListener, createScrollListener, createTrackListener, getMaximumSize, getMaximumThumbSize, getSupportsAbsolutePositioning, getThumbBounds, getTrackBounds, installComponents, installKeyboardActions, installUI, isThumbRollover, layoutContainer, layoutHScrollbar, layoutVScrollbar, minimumLayoutSize, paint, paintDecreaseHighlight, paintIncreaseHighlight, preferredLayoutSize, removeLayoutComponent, scrollByBlock, scrollByUnit, setThumbRollover, uninstallComponents, uninstallDefaults, uninstallKeyboardActions, uninstallListeners, uninstallUI

Methods inherited from class javax.swing.plaf.ComponentUI

contains, getAccessibleChild, getAccessibleChildrenCount, getBaseline, getBaselineResizeBehavior, getMinimumSize, update

Methods inherited from class java.lang.Object

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

Field Details

increaseButton

protected MetalScrollButton increaseButton

The increase button.

decreaseButton

protected MetalScrollButton decreaseButton

The decrease button.

scrollBarWidth

protected int scrollBarWidth

The width of the scroll bar.

FREE_STANDING_PROP

public static final String FREE_STANDING_PROP

The property JScrollBar.isFreeStanding.

See Also:

• Constant Field Values

isFreeStanding

protected boolean isFreeStanding

The value of the property JScrollBar.isFreeStanding.

Constructor Details

MetalScrollBarUI

public MetalScrollBarUI()

Constructs a MetalScrollBarUI.

Method Details

createUI

public static ComponentUI createUI(JComponent c)

Constructs a new MetalScrollBarUI instance.

Parameters:

c - a component

Returns:

a new MetalScrollBarUI instance

installDefaults

protected void installDefaults()

Description copied from class: BasicScrollBarUI

Installs the defaults.

Overrides:

installDefaults in class BasicScrollBarUI

installListeners

protected void installListeners()

Description copied from class: BasicScrollBarUI

Installs the listeners.

Overrides:

installListeners in class BasicScrollBarUI

createPropertyChangeListener

protected PropertyChangeListener createPropertyChangeListener()

Description copied from class: BasicScrollBarUI

Creates a property change listener.

Overrides:

createPropertyChangeListener in class BasicScrollBarUI

Returns:

a property change listener

configureScrollBarColors

protected void configureScrollBarColors()

Description copied from class: BasicScrollBarUI

Configures the scroll bar colors.

Overrides:

configureScrollBarColors in class BasicScrollBarUI

getPreferredSize

public Dimension getPreferredSize(JComponent c)

Description copied from class: BasicScrollBarUI

A vertical scrollbar's preferred width is the maximum of preferred widths of the (non null) 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 preferredSize is only computed once, subsequent calls to this method just return a cached size.

Overrides:

getPreferredSize in class BasicScrollBarUI

Parameters:

c - the JScrollBar that's delegating this method to us

Returns:

the preferred size of a Basic JScrollBar

See Also:

• BasicScrollBarUI.getMaximumSize(JComponent)
• ComponentUI.getMinimumSize(JComponent)

createDecreaseButton

protected JButton createDecreaseButton(int orientation)

Returns the view that represents the decrease view.

Overrides:

createDecreaseButton in class BasicScrollBarUI

Parameters:

orientation - the orientation

Returns:

a decrease button

createIncreaseButton

protected JButton createIncreaseButton(int orientation)

Returns the view that represents the increase view.

Overrides:

createIncreaseButton in class BasicScrollBarUI

Parameters:

orientation - the orientation

Returns:

an increase button

paintTrack

protected void paintTrack(Graphics g,
 JComponent c,
 Rectangle trackBounds)

Description copied from class: BasicScrollBarUI

Paints the track.

Overrides:

paintTrack in class BasicScrollBarUI

Parameters:

g - the graphics

c - the component

trackBounds - the track bounds

paintThumb

protected void paintThumb(Graphics g,
 JComponent c,
 Rectangle thumbBounds)

Description copied from class: BasicScrollBarUI

Paints the thumb.

Overrides:

paintThumb in class BasicScrollBarUI

Parameters:

g - the graphics

c - the component

thumbBounds - the thumb bounds

getMinimumThumbSize

protected Dimension getMinimumThumbSize()

Description copied from class: BasicScrollBarUI

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.

Overrides:

getMinimumThumbSize in class BasicScrollBarUI

Returns:

The smallest acceptable size for the thumb.

See Also:

• BasicScrollBarUI.getMaximumThumbSize()

setThumbBounds

protected void setThumbBounds(int x,
 int y,
 int width,
 int height)

This is overridden only to increase the invalid area. This ensures that the "Shadow" below the thumb is invalidated

Overrides:

setThumbBounds in class BasicScrollBarUI

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:

• BasicScrollBarUI.getThumbBounds()