Module java.desktop
Package javax.swing.plaf

## Class ComboBoxUI

- java.lang.Object
- - javax.swing.plaf.ComponentUI
  - - javax.swing.plaf.ComboBoxUI

- Direct Known Subclasses:
    `BasicComboBoxUI`, `MultiComboBoxUI`

      public abstract class ComboBoxUI
      extends ComponentUI

  Pluggable look and feel interface for JComboBox.

- - ### Constructor Summary

    Constructors
    Constructor | Description
    --- | ---
    `ComboBoxUI​()` |

  - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `abstract boolean` | `isFocusTraversable​(JComboBox<?> c)` | Determine whether or not the combo box itself is traversable
    `abstract boolean` | `isPopupVisible​(JComboBox<?> c)` | Determine the visibility of the popup
    `abstract void` | `setPopupVisible​(JComboBox<?> c, boolean v)` | Set the visibility of the popup

    - ### Methods inherited from class javax.swing.plaf.ComponentUI

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

    - ### Methods inherited from class java.lang.Object

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

- - ### Constructor Detail

    - #### ComboBoxUI

          public ComboBoxUI​()

  - ### Method Detail

    - #### setPopupVisible

          public abstract void setPopupVisible​(JComboBox<?> c,
                                               boolean v)

      Set the visibility of the popup
      Parameters:
        `c` - a `JComboBox`
        `v` - a `boolean` determining the visibilty of the popup

    - #### isPopupVisible

          public abstract boolean isPopupVisible​(JComboBox<?> c)

      Determine the visibility of the popup
      Parameters:
        `c` - a `JComboBox`
      Returns:
        true if popup of the `JComboBox` is visible

    - #### isFocusTraversable

          public abstract boolean isFocusTraversable​(JComboBox<?> c)

      Determine whether or not the combo box itself is traversable
      Parameters:
        `c` - a `JComboBox`
      Returns:
        true if the given `JComboBox` is traversable