# Class MetalMenuBarUI

java.lang.Object
javax.swing.plaf.ComponentUI
javax.swing.plaf.MenuBarUI
javax.swing.plaf.basic.BasicMenuBarUI
javax.swing.plaf.metal.MetalMenuBarUI

public class MetalMenuBarUI extends BasicMenuBarUI
Metal implementation of `MenuBarUI`. This class is responsible for providing the metal look and feel for `JMenuBar`s.

Since:
  1.5
See Also:
  - `MenuBarUI`

- ## Field Summary

  ### Fields declared in class BasicMenuBarUI

  `changeListener, containerListener, menuBar`
  Modifier and Type
  Field
  Description
  `protected ChangeListener`
  `changeListener`
  The instance of `ChangeListener`.
  `protected ContainerListener`
  `containerListener`
  The instance of `ContainerListener`.
  `protected JMenuBar`
  `menuBar`
  The instance of `JMenuBar`.

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `MetalMenuBarUI()`
  Constructs a `MetalMenuBarUI`.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `static ComponentUI`
  `createUI(JComponent x)`
  Creates the `ComponentUI` implementation for the passed in component.
  `void`
  `installUI(JComponent c)`
  Configures the specified component appropriate for the metal look and feel.
  `void`
  `uninstallUI(JComponent c)`
  Reverses configuration which was done on the specified component during `installUI`.
  `void`
  `update(Graphics g, JComponent c)`
  If necessary paints the background of the component, then invokes `paint`.

  ### Methods declared in class BasicMenuBarUI

  `createChangeListener, createContainerListener, installDefaults, installKeyboardActions, installListeners, uninstallDefaults, uninstallKeyboardActions, uninstallListeners`
  Modifier and Type
  Method
  Description
  `protected ChangeListener`
  `createChangeListener()`
  Returns an instance of `ChangeListener`.
  `protected ContainerListener`
  `createContainerListener()`
  Returns an instance of `ContainerListener`.
  `protected void`
  `installDefaults()`
  Installs default properties.
  `protected void`
  `installKeyboardActions()`
  Registers keyboard actions.
  `protected void`
  `installListeners()`
  Registers listeners.
  `protected void`
  `uninstallDefaults()`
  Uninstalls default properties.
  `protected void`
  `uninstallKeyboardActions()`
  Unregisters keyboard actions.
  `protected void`
  `uninstallListeners()`
  Unregisters listeners.

  ### Methods declared in class ComponentUI

  `contains, getAccessibleChild, getAccessibleChildrenCount, getBaseline, getBaselineResizeBehavior, getMaximumSize, getMinimumSize, getPreferredSize, paint`
  Modifier and Type
  Method
  Description
  `boolean`
  `contains(JComponent c, int x, int y)`
  Returns `true` if the specified x,y location is contained within the look and feel's defined shape of the specified component.
  `Accessible`
  `getAccessibleChild(JComponent c, int i)`
  Returns the `i`th `Accessible` child of the object.
  `int`
  `getAccessibleChildrenCount(JComponent c)`
  Returns the number of accessible children in the object.
  `int`
  `getBaseline(JComponent c, int width, int height)`
  Returns the baseline.
  `Component.BaselineResizeBehavior`
  `getBaselineResizeBehavior(JComponent c)`
  Returns an enum indicating how the baseline of the component changes as the size changes.
  `Dimension`
  `getMaximumSize(JComponent c)`
  Returns the specified component's maximum size appropriate for the look and feel.
  `Dimension`
  `getMinimumSize(JComponent c)`
  Returns the specified component's minimum size appropriate for the look and feel.
  `Dimension`
  `getPreferredSize(JComponent c)`
  Returns the specified component's preferred size appropriate for the look and feel.
  `void`
  `paint(Graphics g, JComponent c)`
  Paints the specified component appropriately for the look and feel.

  ### Methods declared in class Object

  `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`
  Modifier and Type
  Method
  Description
  `protected Object`
  `clone()`
  Creates and returns a copy of this object.
  `boolean`
  `equals(Object obj)`
  Indicates whether some other object is "equal to" this one.
  `protected void`
  `finalize()`
  Deprecated, for removal: This API element is subject to removal in a future version.
  Finalization is deprecated and subject to removal in a future release.
  `final Class<?>`
  `getClass()`
  Returns the runtime class of this `Object`.
  `int`
  `hashCode()`
  Returns a hash code value for this object.
  `final void`
  `notify()`
  Wakes up a single thread that is waiting on this object's monitor.
  `final void`
  `notifyAll()`
  Wakes up all threads that are waiting on this object's monitor.
  `String`
  `toString()`
  Returns a string representation of the object.
  `final void`
  `wait()`
  Causes the current thread to wait until it is awakened, typically by being notified or interrupted.
  `final void`
  `wait(long timeoutMillis)`
  Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
  `final void`
  `wait(long timeoutMillis, int nanos)`
  Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.

- ## Constructor Details

  - ### MetalMenuBarUI

    public MetalMenuBarUI()
    Constructs a `MetalMenuBarUI`.

- ## Method Details

  - ### createUI

    public static ComponentUI createUI(JComponent x)
    Creates the `ComponentUI` implementation for the passed in component.
    Parameters:
      `x` - JComponent to create the ComponentUI implementation for
    Returns:
      ComponentUI implementation for `x`
    Throws:
      `NullPointerException` - if `x` is null

  - ### installUI

    public void installUI(JComponent c)
    Configures the specified component appropriate for the metal look and feel.
    Overrides:
      `installUI` in class `ComponentUI`
    Parameters:
      `c` - the component where this UI delegate is being installed
    Throws:
      `NullPointerException` - if `c` is null.
    See Also:
      - `ComponentUI.uninstallUI(JComponent)`
      - `JComponent.setUI(ComponentUI)`
      - `JComponent.updateUI()`

  - ### uninstallUI

    public void uninstallUI(JComponent c)
    Reverses configuration which was done on the specified component during `installUI`.
    Overrides:
      `uninstallUI` in class `ComponentUI`
    Parameters:
      `c` - the component where this UI delegate is being installed
    Throws:
      `NullPointerException` - if `c` is null.
    See Also:
      - `ComponentUI.installUI(JComponent)`
      - `JComponent.updateUI()`

  - ### update

    public void update(Graphics g, JComponent c)
    If necessary paints the background of the component, then invokes `paint`.
    Overrides:
      `update` in class `ComponentUI`
    Parameters:
      `g` - Graphics to paint to
      `c` - JComponent painting on
    Throws:
      `NullPointerException` - if `g` or `c` is null
    Since:
      1.5
    See Also:
      - `ComponentUI.update(Graphics, JComponent)`
      - `ComponentUI.paint(Graphics, JComponent)`