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Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Class BasicScrollBarUI - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

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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

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public class BasicScrollBarUI

extends ScrollBarUI

implements LayoutManager, SwingConstants

Implementation of ScrollBarUI for the Basic Look and Feel

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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

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maximumThumbSize

protected Dimension maximumThumbSize

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thumbHighlightColor

protected Color thumbHighlightColor

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thumbLightShadowColor

protected Color thumbLightShadowColor

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thumbDarkShadowColor

protected Color thumbDarkShadowColor

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thumbColor

protected Color thumbColor

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trackColor

protected Color trackColor

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trackHighlightColor

protected Color trackHighlightColor

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scrollbar

protected JScrollBar scrollbar

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incrButton

protected JButton incrButton

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decrButton

protected JButton decrButton

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isDragging

protected boolean isDragging

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trackListener

protected BasicScrollBarUI.TrackListener trackListener

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buttonListener

protected BasicScrollBarUI.ArrowButtonListener buttonListener

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modelListener

protected BasicScrollBarUI.ModelListener modelListener

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thumbRect

protected Rectangle thumbRect

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trackRect

protected Rectangle trackRect

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trackHighlight

protected int trackHighlight

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NO_HIGHLIGHT

protected static final int NO_HIGHLIGHT

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DECREASE_HIGHLIGHT

protected static final int DECREASE_HIGHLIGHT

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INCREASE_HIGHLIGHT

protected static final int INCREASE_HIGHLIGHT

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scrollListener

protected BasicScrollBarUI.ScrollListener scrollListener

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propertyChangeListener

protected PropertyChangeListener propertyChangeListener

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scrollTimer

protected Timer scrollTimer

Constructor Detail

BasicScrollBarUI

public BasicScrollBarUI()

Method Detail

createUI

public static ComponentUI createUI(JComponent c)

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configureScrollBarColors

protected void configureScrollBarColors()

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installUI

public void installUI(JComponent c)

Overrides:

installUI in class ComponentUI

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uninstallUI

public void uninstallUI(JComponent c)

Overrides:

uninstallUI in class ComponentUI

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installDefaults

protected void installDefaults()

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installComponents

protected void installComponents()

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uninstallComponents

protected void uninstallComponents()

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installListeners

protected void installListeners()

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installKeyboardActions

protected void installKeyboardActions()

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uninstallKeyboardActions

protected void uninstallKeyboardActions()

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uninstallListeners

protected void uninstallListeners()

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uninstallDefaults

protected void uninstallDefaults()

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createTrackListener

protected BasicScrollBarUI.TrackListener createTrackListener()

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createArrowButtonListener

protected BasicScrollBarUI.ArrowButtonListener createArrowButtonListener()

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createModelListener

protected BasicScrollBarUI.ModelListener createModelListener()

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createScrollListener

protected BasicScrollBarUI.ScrollListener createScrollListener()

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createPropertyChangeListener

protected PropertyChangeListener createPropertyChangeListener()

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paint

public void paint(Graphics g,
                  JComponent c)

Overrides:

paint in class ComponentUI

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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)

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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)

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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)

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createDecreaseButton

protected JButton createDecreaseButton(int orientation)

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createIncreaseButton

protected JButton createIncreaseButton(int orientation)

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paintDecreaseHighlight

protected void paintDecreaseHighlight(Graphics g)

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paintIncreaseHighlight

protected void paintIncreaseHighlight(Graphics g)

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paintTrack

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

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paintThumb

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

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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()

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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()

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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

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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

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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)

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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)

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layoutVScrollbar

protected void layoutVScrollbar(JScrollBar sb)

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layoutHScrollbar

protected void layoutHScrollbar(JScrollBar sb)

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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

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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()

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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)

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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)

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scrollByBlock

protected void scrollByBlock(int direction)

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scrollByUnit

protected void scrollByUnit(int direction)

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