javax.swing.plaf.basic
Class BasicScrollBarUI

java.lang.Object
  |
  +--javax.swing.plaf.ComponentUI
        |
        +--javax.swing.plaf.ScrollBarUI
              |
              +--javax.swing.plaf.basic.BasicScrollBarUI

Direct Known Subclasses:

MetalScrollBarUI

public class BasicScrollBarUI

extends ScrollBarUI

implements LayoutManager, SwingConstants

Implementation of ScrollBarUI for the Basic Look and Feel

Inner Class Summary

protected class	BasicScrollBarUI.ArrowButtonListener Listener for cursor keys.
protected class	BasicScrollBarUI.ModelListener A listener to listen for model changes.
class	BasicScrollBarUI.PropertyChangeHandler
protected class	BasicScrollBarUI.ScrollListener Listener for scrolling events intiated in the ScrollPane.
protected class	BasicScrollBarUI.TrackListener Track mouse drags.

Field Summary

protected BasicScrollBarUI.ArrowButtonListener	buttonListener
protected JButton	decrButton
protected static int	DECREASE_HIGHLIGHT
protected JButton	incrButton
protected static int	INCREASE_HIGHLIGHT
protected boolean	isDragging
protected Dimension	maximumThumbSize
protected Dimension	minimumThumbSize
protected BasicScrollBarUI.ModelListener	modelListener
protected static int	NO_HIGHLIGHT
protected PropertyChangeListener	propertyChangeListener
protected JScrollBar	scrollbar
protected BasicScrollBarUI.ScrollListener	scrollListener
protected Timer	scrollTimer
protected Color	thumbColor
protected Color	thumbDarkShadowColor
protected Color	thumbHighlightColor
protected Color	thumbLightShadowColor
protected Rectangle	thumbRect
protected Color	trackColor
protected int	trackHighlight
protected Color	trackHighlightColor
protected BasicScrollBarUI.TrackListener	trackListener
protected Rectangle	trackRect

Fields inherited from interface javax.swing.SwingConstants

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

Constructor Summary

BasicScrollBarUI()

Method Summary

void	addLayoutComponent(String name, Component child) Adds the specified component with the specified name to the layout.
protected void	configureScrollBarColors()
protected BasicScrollBarUI.ArrowButtonListener	createArrowButtonListener()
protected JButton	createDecreaseButton(int orientation)
protected JButton	createIncreaseButton(int orientation)
protected BasicScrollBarUI.ModelListener	createModelListener()
protected PropertyChangeListener	createPropertyChangeListener()
protected BasicScrollBarUI.ScrollListener	createScrollListener()
protected BasicScrollBarUI.TrackListener	createTrackListener()
static ComponentUI	createUI(JComponent c)
Dimension	getMaximumSize(JComponent c)
protected Dimension	getMaximumThumbSize() Return the smallest acceptable size for the thumb.
Dimension	getMinimumSize(JComponent c) A vertical scrollbars minimum width is the largest minimum width of the (non null) increment/decrement buttons, and the minimum width of the thumb.
protected Dimension	getMinimumThumbSize() Return the smallest acceptable size for the thumb.
Dimension	getPreferredSize(JComponent c) A vertical scrollbars preferred width is the maximum of preferred widths of the (non null) increment/decrement buttons, and the minimum width of the thumb.
protected Rectangle	getThumbBounds() Return the current size/location of the thumb.
protected Rectangle	getTrackBounds() Return the current bounds of the track, i.e.
protected void	installComponents()
protected void	installDefaults()
protected void	installKeyboardActions()
protected void	installListeners()
void	installUI(JComponent c)
void	layoutContainer(Container scrollbarContainer) Lays out the container in the specified panel.
protected void	layoutHScrollbar(JScrollBar sb)
protected void	layoutVScrollbar(JScrollBar sb)
Dimension	minimumLayoutSize(Container scrollbarContainer) Calculates the minimum size dimensions for the specified panel given the components in the specified parent container.
void	paint(Graphics g, JComponent c)
protected void	paintDecreaseHighlight(Graphics g)
protected void	paintIncreaseHighlight(Graphics g)
protected void	paintThumb(Graphics g, JComponent c, Rectangle thumbBounds)
protected void	paintTrack(Graphics g, JComponent c, Rectangle trackBounds)
Dimension	preferredLayoutSize(Container scrollbarContainer) Calculates the preferred size dimensions for the specified panel given the components in the specified parent container.
void	removeLayoutComponent(Component child) Removes the specified component from the layout.
protected void	scrollByBlock(int direction)
protected void	scrollByUnit(int direction)
protected 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.
protected void	uninstallComponents()
protected void	uninstallDefaults()
protected void	uninstallKeyboardActions()
protected void	uninstallListeners()
void	uninstallUI(JComponent c)

Methods inherited from class javax.swing.plaf.ComponentUI

contains, getAccessibleChild, getAccessibleChildrenCount, update

Methods inherited from class java.lang.Object

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

Field Detail

minimumThumbSize

protected Dimension minimumThumbSize

maximumThumbSize

protected Dimension maximumThumbSize

thumbHighlightColor

protected Color thumbHighlightColor

thumbLightShadowColor

protected Color thumbLightShadowColor

thumbDarkShadowColor

protected Color thumbDarkShadowColor

thumbColor

protected Color thumbColor

trackColor

protected Color trackColor

trackHighlightColor

protected Color trackHighlightColor

scrollbar

protected JScrollBar scrollbar

incrButton

protected JButton incrButton

decrButton

protected JButton decrButton

isDragging

protected boolean isDragging

trackListener

protected BasicScrollBarUI.TrackListener trackListener

buttonListener

protected BasicScrollBarUI.ArrowButtonListener buttonListener

modelListener

protected BasicScrollBarUI.ModelListener modelListener

thumbRect

protected Rectangle thumbRect

trackRect

protected Rectangle trackRect

trackHighlight

protected int trackHighlight

NO_HIGHLIGHT

protected static final int NO_HIGHLIGHT

DECREASE_HIGHLIGHT

protected static final int DECREASE_HIGHLIGHT

INCREASE_HIGHLIGHT

protected static final int INCREASE_HIGHLIGHT

scrollListener

protected BasicScrollBarUI.ScrollListener scrollListener

propertyChangeListener

protected PropertyChangeListener propertyChangeListener

scrollTimer

protected Timer scrollTimer

Constructor Detail

BasicScrollBarUI

public BasicScrollBarUI()

Method Detail

createUI

public static ComponentUI createUI(JComponent c)

configureScrollBarColors

protected void configureScrollBarColors()

installUI

public void installUI(JComponent c)

Overrides:

installUI in class ComponentUI

uninstallUI

public void uninstallUI(JComponent c)

Overrides:

uninstallUI in class ComponentUI

installDefaults

protected void installDefaults()

installComponents

protected void installComponents()

uninstallComponents

protected void uninstallComponents()

installListeners

protected void installListeners()

installKeyboardActions

protected void installKeyboardActions()

uninstallKeyboardActions

protected void uninstallKeyboardActions()

uninstallListeners

protected void uninstallListeners()

uninstallDefaults

protected void uninstallDefaults()

createTrackListener

protected BasicScrollBarUI.TrackListener createTrackListener()

createArrowButtonListener

protected BasicScrollBarUI.ArrowButtonListener createArrowButtonListener()

createModelListener

protected BasicScrollBarUI.ModelListener createModelListener()

createScrollListener

protected BasicScrollBarUI.ScrollListener createScrollListener()

createPropertyChangeListener

protected PropertyChangeListener createPropertyChangeListener()

paint

public void paint(Graphics g,
                  JComponent c)

Overrides:

paint in class ComponentUI

getPreferredSize

public Dimension getPreferredSize(JComponent c)

A vertical scrollbars 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, subequent calls to this method just return a cached size. T

Overrides:

getPreferredSize in class ComponentUI

Parameters:

c - The JScrollBar that's delegating this method to us.

Returns:

The preferred size of a Basic JScrollBar.

See Also:

getMaximumSize(javax.swing.JComponent), getMinimumSize(javax.swing.JComponent)

getMinimumSize

public Dimension getMinimumSize(JComponent c)

A vertical scrollbars minimum width is the largest minimum width of the (non null) increment/decrement buttons, and the minimum width of the thumb. The minimum height is the sum of the minimum heights of the same parts. The basis for the preferred size of a horizontal scrollbar is similar.

The minimumSize is only computed once, subequent calls to this method just return a cached size. T

Overrides:

getMinimumSize in class ComponentUI

Parameters:

c - The JScrollBar that's delegating this method to us.

Returns:

The minimum size of a Basic JScrollBar.

See Also:

getMaximumSize(javax.swing.JComponent), getPreferredSize(javax.swing.JComponent)

getMaximumSize

public Dimension getMaximumSize(JComponent c)

Overrides:

getMaximumSize in class ComponentUI

Parameters:

c - The JScrollBar that's delegating this method to us.

Returns:

new Dimension(Integer.MAX_VALUE, Integer.MAX_VALUE);

See Also:

getMinimumSize(javax.swing.JComponent), getPreferredSize(javax.swing.JComponent)

createDecreaseButton

protected JButton createDecreaseButton(int orientation)

createIncreaseButton

protected JButton createIncreaseButton(int orientation)

paintDecreaseHighlight

protected void paintDecreaseHighlight(Graphics g)

paintIncreaseHighlight

protected void paintIncreaseHighlight(Graphics g)

paintTrack

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

paintThumb

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

getMinimumThumbSize

protected Dimension getMinimumThumbSize()

Return 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()

getMaximumThumbSize

protected Dimension getMaximumThumbSize()

Return the smallest acceptable size for the thumb. If the scrollbar becomes so small that this size isn't available, the thumb will be hidden. To create a fixed size thumb one make this method and getMinimumThumbSize return the same value.

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:

getMinimumThumbSize()

addLayoutComponent

public void addLayoutComponent(String name,
                               Component child)

Description copied from interface: LayoutManager

Adds the specified component with the specified name to the layout.

Specified by:

addLayoutComponent in interface LayoutManager

Tags copied from interface: LayoutManager

Parameters:

name - the component name

comp - the component to be added

removeLayoutComponent

public void removeLayoutComponent(Component child)

Description copied from interface: LayoutManager

Removes the specified component from the layout.

Specified by:

removeLayoutComponent in interface LayoutManager

Tags copied from interface: LayoutManager

Parameters:

comp - the component to be removed

preferredLayoutSize

public Dimension preferredLayoutSize(Container scrollbarContainer)

Description copied from interface: LayoutManager

Calculates the preferred size dimensions for the specified panel given the components in the specified parent container.

Specified by:

preferredLayoutSize in interface LayoutManager

Tags copied from interface: LayoutManager

Parameters:

parent - the component to be laid out

See Also:

LayoutManager.minimumLayoutSize(java.awt.Container)

minimumLayoutSize

public Dimension minimumLayoutSize(Container scrollbarContainer)

Description copied from interface: LayoutManager

Calculates the minimum size dimensions for the specified panel given the components in the specified parent container.

Specified by:

minimumLayoutSize in interface LayoutManager

Tags copied from interface: LayoutManager

Parameters:

parent - the component to be laid out

See Also:

LayoutManager.preferredLayoutSize(java.awt.Container)

layoutVScrollbar

protected void layoutVScrollbar(JScrollBar sb)

layoutHScrollbar

protected void layoutHScrollbar(JScrollBar sb)

layoutContainer

public void layoutContainer(Container scrollbarContainer)

Description copied from interface: LayoutManager

Lays out the container in the specified panel.

Specified by:

layoutContainer in interface LayoutManager

Tags copied from interface: LayoutManager

Parameters:

parent - the component which needs to be laid out

setThumbBounds

protected 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.

See Also:

getThumbBounds()

getThumbBounds

protected 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)

getTrackBounds

protected Rectangle getTrackBounds()

Return 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 layed 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:

layoutContainer(java.awt.Container)

scrollByBlock

protected void scrollByBlock(int direction)

scrollByUnit

protected void scrollByUnit(int direction)