Java javax.swing.plaf.synth Class SynthScrollBarUI（JDK8）

Constructor Detail

• SynthScrollBarUI

  public SynthScrollBarUI()

Method Detail

• createUI

  public static ComponentUI createUI(JComponent c)

• installDefaults

  protected void installDefaults()

  Overrides:

  installDefaults in class BasicScrollBarUI

• configureScrollBarColors

  protected void configureScrollBarColors()

  Overrides:

  configureScrollBarColors in class BasicScrollBarUI

• installListeners

  protected void installListeners()

  Overrides:

  installListeners in class BasicScrollBarUI

• uninstallListeners

  protected void uninstallListeners()

  Overrides:

  uninstallListeners in class BasicScrollBarUI

• uninstallDefaults

  protected void uninstallDefaults()

  Overrides:

  uninstallDefaults in class BasicScrollBarUI

• getContext

  public SynthContext getContext(JComponent c)

  Returns the Context for the specified component.

  Specified by:

  getContext in interface SynthUI

  Parameters:

  c - Component requesting SynthContext.

  Returns:

  SynthContext describing component.

• getSupportsAbsolutePositioning

  public boolean getSupportsAbsolutePositioning()

  Indicates whether the user can absolutely position the thumb with a mouse gesture (usually the middle mouse button).

  Overrides:

  getSupportsAbsolutePositioning in class BasicScrollBarUI

  Returns:

  true if a mouse gesture can absolutely position the thumb

• update

  public void update(Graphics g,
                     JComponent c)

  Notifies this UI delegate to repaint the specified component. This method paints the component background, then calls the paint(SynthContext,Graphics) method.

  In general, this method does not need to be overridden by subclasses. All Look and Feel rendering code should reside in the paint method.

  Overrides:

  update in class ComponentUI

  Parameters:

  g - the Graphics object used for painting

  c - the component being painted

  See Also:

  paint(SynthContext,Graphics)

• paint

  public void paint(Graphics g,
                    JComponent c)

  Paints the specified component according to the Look and Feel.

  This method is not used by Synth Look and Feel. Painting is handled by the paint(SynthContext,Graphics) method.

  Overrides:

  paint in class BasicScrollBarUI

  Parameters:

  g - the Graphics object used for painting

  c - the component being painted

  See Also:

  paint(SynthContext,Graphics)

• paint

  protected void paint(SynthContext context,
                       Graphics g)

  Paints the specified component.

  Parameters:

  context - context for the component being painted

  g - the Graphics object used for painting

  See Also:

  update(Graphics,JComponent)

• paintBorder

  public void paintBorder(SynthContext context,
                          Graphics g,
                          int x,
                          int y,
                          int w,
                          int h)

  Paints the border.

  Specified by:

  paintBorder in interface SynthUI

  Parameters:

  context - a component context

  g - Graphics to paint on

  x - the X coordinate

  y - the Y coordinate

  w - width of the border

  h - height of the border

• paintTrack

  protected void paintTrack(SynthContext context,
                            Graphics g,
                            Rectangle trackBounds)

  Paints the scrollbar track.

  Parameters:

  context - context for the component being painted

  g - Graphics object used for painting

  trackBounds - bounding box for the track

• paintThumb

  protected void paintThumb(SynthContext context,
                            Graphics g,
                            Rectangle thumbBounds)

  Paints the scrollbar thumb.

  Parameters:

  context - context for the component being painted

  g - Graphics object used for painting

  thumbBounds - bounding box for the thumb

• getPreferredSize

  public 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. 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(javax.swing.JComponent), ComponentUI.getMinimumSize(javax.swing.JComponent)

• getMinimumThumbSize

  protected 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.

  Overrides:

  getMinimumThumbSize in class BasicScrollBarUI

  Returns:

  The smallest acceptable size for the thumb.

  See Also:

  BasicScrollBarUI.getMaximumThumbSize()

• createDecreaseButton

  protected JButton createDecreaseButton(int orientation)

  Overrides:

  createDecreaseButton in class BasicScrollBarUI

• createIncreaseButton

  protected JButton createIncreaseButton(int orientation)

  Overrides:

  createIncreaseButton in class BasicScrollBarUI

• setThumbRollover

  protected void setThumbRollover(boolean active)

  Sets whether or not the mouse is currently over the thumb.

  Overrides:

  setThumbRollover in class BasicScrollBarUI

  Parameters:

  active - True indicates the thumb is currently active.

• propertyChange

  public void propertyChange(PropertyChangeEvent e)

  Description copied from interface: PropertyChangeListener
  This method gets called when a bound property is changed.

  Specified by:

  propertyChange in interface PropertyChangeListener

  Parameters:

  e - A PropertyChangeEvent object describing the event source and the property that has changed.