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

Class BasicMenuBarUI

  • Direct Known Subclasses:
    MetalMenuBarUI, SynthMenuBarUI

    public class BasicMenuBarUI
extends MenuBarUI
    A default L&F implementation of MenuBarUI. This implementation is a "combined" view/controller.

    • Field Detail

      • menuBar

        protected JMenuBar menuBar
        The instance of JMenuBar.

      • containerListener

        protected ContainerListener containerListener
        The instance of ContainerListener.

      • changeListener

        protected ChangeListener changeListener
        The instance of ChangeListener.

    • Constructor Detail

      • BasicMenuBarUI

        public BasicMenuBarUI​()

    • Method Detail

      • createUI

        public static ComponentUI createUI​(JComponent x)
        Returns a new instance of BasicMenuBarUI.
        Parameters:
        x - a component
        Returns:
        a new instance of BasicMenuBarUI

      • installUI

        public void installUI​(JComponent c)
        Description copied from class: ComponentUI
        Configures the specified component appropriately for the look and feel. This method is invoked when the ComponentUI instance is being installed as the UI delegate on the specified component. This method should completely configure the component for the look and feel, including the following:
        1. Install default property values for color, fonts, borders, icons, opacity, etc. on the component. Whenever possible, property values initialized by the client program should not be overridden.
        2. Install a LayoutManager on the component if necessary.
        3. Create/add any required sub-components to the component.
        4. Create/install event listeners on the component.
        5. Create/install a PropertyChangeListener on the component in order to detect and respond to component property changes appropriately.
        6. Install keyboard UI (mnemonics, traversal, etc.) on the component.
        7. Initialize any appropriate instance data.
        Overrides:
        installUI in class ComponentUI
        Parameters:
        c - the component where this UI delegate is being installed
        See Also:
        ComponentUI.uninstallUI(javax.swing.JComponent), JComponent.setUI(javax.swing.plaf.ComponentUI), JComponent.updateUI()

      • installDefaults

        protected void installDefaults​()
        Installs default properties.

      • installListeners

        protected void installListeners​()
        Registers listeners.

      • installKeyboardActions

        protected void installKeyboardActions​()
        Registers keyboard actions.

      • uninstallUI

        public void uninstallUI​(JComponent c)
        Description copied from class: ComponentUI
        Reverses configuration which was done on the specified component during installUI. This method is invoked when this UIComponent instance is being removed as the UI delegate for the specified component. This method should undo the configuration performed in installUI, being careful to leave the JComponent instance in a clean state (no extraneous listeners, look-and-feel-specific property objects, etc.). This should include the following:
        1. Remove any UI-set borders from the component.
        2. Remove any UI-set layout managers on the component.
        3. Remove any UI-added sub-components from the component.
        4. Remove any UI-added event/property listeners from the component.
        5. Remove any UI-installed keyboard UI from the component.
        6. Nullify any allocated instance data objects to allow for GC.
        Overrides:
        uninstallUI in class ComponentUI
        Parameters:
        c - the component from which this UI delegate is being removed; this argument is often ignored, but might be used if the UI object is stateless and shared by multiple components
        See Also:
        ComponentUI.installUI(javax.swing.JComponent), JComponent.updateUI()

      • uninstallDefaults

        protected void uninstallDefaults​()
        Uninstalls default properties.

      • uninstallListeners

        protected void uninstallListeners​()
        Unregisters listeners.

      • uninstallKeyboardActions

        protected void uninstallKeyboardActions​()
        Unregisters keyboard actions.

      • createContainerListener

        protected ContainerListener createContainerListener​()
        Returns an instance of ContainerListener.
        Returns:
        an instance of ContainerListener

      • createChangeListener

        protected ChangeListener createChangeListener​()
        Returns an instance of ChangeListener.
        Returns:
        an instance of ChangeListener

      • getMaximumSize

        public Dimension getMaximumSize​(JComponent c)
        Description copied from class: ComponentUI
        Returns the specified component's maximum size appropriate for the look and feel. If null is returned, the maximum size will be calculated by the component's layout manager instead (this is the preferred approach for any component with a specific layout manager installed). The default implementation of this method invokes getPreferredSize and returns that value.
        Overrides:
        getMaximumSize in class ComponentUI
        Parameters:
        c - the component whose maximum size is being queried; this argument is often ignored, but might be used if the UI object is stateless and shared by multiple components
        Returns:
        a Dimension object or null
        See Also:
        JComponent.getMaximumSize(), LayoutManager2.maximumLayoutSize(java.awt.Container)