JavaTM 2 Platform
Std. Ed. v1.3.1

javax.swing.plaf.basic
Class BasicScrollBarUI

java.lang.Object
  |
  +--javax.swing.plaf.ComponentUI
        |
        +--javax.swing.plaf.ScrollBarUI
              |
              +--javax.swing.plaf.basic.BasicScrollBarUI
All Implemented Interfaces:
LayoutManager, SwingConstants
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 largest 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 largest acceptable size for the thumb. 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 largest 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
Following copied from interface: java.awt.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
Following copied from interface: java.awt.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
Following copied from interface: java.awt.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
Following copied from interface: java.awt.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
Following copied from interface: java.awt.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)

JavaTM 2 Platform
Std. Ed. v1.3.1

Submit a bug or feature
For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

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