Module java.desktop

Class SynthScrollBarUI

All Implemented Interfaces:
LayoutManager, PropertyChangeListener, EventListener, SynthConstants, SynthUI, SwingConstants

public class SynthScrollBarUI
extends BasicScrollBarUI
implements PropertyChangeListener, SynthUI
Provides the Synth L&F UI delegate for JScrollBar.
Since:
1.7
  • Constructor Details

    • SynthScrollBarUI

      public SynthScrollBarUI()
  • Method Details

    • createUI

      public static ComponentUI createUI​(JComponent c)
      Returns a UI.
      Parameters:
      c - a component
      Returns:
      a UI
    • 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 ComponentUI
      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)
    • 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)