SynthViewportUI (Java SE 12 & JDK 12 )
Keywords: javax.swing.plaf.synth.SynthViewportUI class

Module java.desktop
Package javax.swing.plaf.synth

## Class SynthViewportUI

- java.lang.Object
- - javax.swing.plaf.ComponentUI
  - - javax.swing.plaf.ViewportUI
    - - javax.swing.plaf.synth.SynthViewportUI

- All Implemented Interfaces:
    `PropertyChangeListener`, `EventListener`, `SynthConstants`, `SynthUI`

      public class SynthViewportUI
      extends ViewportUI
      implements PropertyChangeListener, SynthUI

  Provides the Synth L&F UI delegate for `JViewport`.
  Since:
    1.7

- - ### Field Summary

    - ### Fields declared in interface javax.swing.plaf.synth.SynthConstants

      `DEFAULT, DISABLED, ENABLED, FOCUSED, MOUSE_OVER, PRESSED, SELECTED`

  - ### Constructor Summary

    Constructors
    Constructor | Description
    --- | ---
    `SynthViewportUI()` |

  - ### Method Summary

    Modifier and Type | Method | Description
    --- | --- | ---
    `static ComponentUI` | `createUI​(JComponent c)` | Creates a new UI object for the given component.
    `protected void` | `installDefaults​(JComponent c)` | Installs defaults for a viewport.
    `protected void` | `installListeners​(JComponent c)` | Installs listeners into the viewport.
    `void` | `paint​(Graphics g, JComponent c)` | Paints the specified component according to the Look and Feel.
    `protected void` | `paint​(SynthContext context, Graphics g)` | Paints the specified component.
    `void` | `paintBorder​(SynthContext context, Graphics g, int x, int y, int w, int h)` | Paints the border.
    `protected void` | `uninstallDefaults​(JComponent c)` | Uninstalls defaults from a viewport.
    `protected void` | `uninstallListeners​(JComponent c)` | Uninstalls listeners from the viewport.
    `void` | `update​(Graphics g, JComponent c)` | Notifies this UI delegate to repaint the specified component.

    - ### Methods declared in class javax.swing.plaf.ComponentUI

      `contains, getAccessibleChild, getAccessibleChildrenCount, getBaseline, getBaselineResizeBehavior, getMaximumSize, getMinimumSize, getPreferredSize, installUI, uninstallUI`

    - ### Methods declared in class java.lang.Object

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

    - ### Methods declared in interface java.beans.PropertyChangeListener

      `propertyChange`

    - ### Methods declared in interface javax.swing.plaf.synth.SynthUI

      `getContext`

- - ### Constructor Detail

    - #### SynthViewportUI

          public SynthViewportUI()

  - ### Method Detail

    - #### createUI

          public static ComponentUI createUI​(JComponent c)

      Creates a new UI object for the given component.
      Parameters:
        `c` - component to create UI object for
      Returns:
        the UI object

    - #### installDefaults

          protected void installDefaults​(JComponent c)

      Installs defaults for a viewport.
      Parameters:
        `c` - a `JViewport` object

    - #### installListeners

          protected void installListeners​(JComponent c)

      Installs listeners into the viewport.
      Parameters:
        `c` - a `JViewport` object

    - #### uninstallListeners

          protected void uninstallListeners​(JComponent c)

      Uninstalls listeners from the viewport.
      Parameters:
        `c` - a `JViewport` object

    - #### uninstallDefaults

          protected void uninstallDefaults​(JComponent c)

      Uninstalls defaults from a viewport.
      Parameters:
        `c` - a `JViewport` object

    - #### 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)`

    - #### paintBorder

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

      Paints the border. The method is never called, because the `JViewport` class does not support a border. This implementation does nothing.
      Specified by:
        `paintBorder` in interface `SynthUI`
      Parameters:
        `context` - a component context
        `g` - the `Graphics` to paint on
        `x` - the X coordinate
        `y` - the Y coordinate
        `w` - width of the border
        `h` - height of the border

    - #### 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. This implementation does nothing.
      Parameters:
        `context` - context for the component being painted
        `g` - the `Graphics` object used for painting
      See Also:
        `update(Graphics,JComponent)`