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package javax.swing.plaf.metal;

import java.awt.*;
import javax.swing.*;
import javax.swing.plaf.ComponentUI;
import javax.swing.plaf.UIResource;
import javax.swing.plaf.basic.*;

Metal implementation of MenuBarUI. This class is responsible for providing the metal look and feel for JMenuBars.
See Also:
  • MenuBarUI
Since:1.5
/** * Metal implementation of <code>MenuBarUI</code>. This class is responsible * for providing the metal look and feel for <code>JMenuBar</code>s. * * @see javax.swing.plaf.MenuBarUI * @since 1.5 */
public class MetalMenuBarUI extends BasicMenuBarUI {
Creates the ComponentUI implementation for the passed in component.
Params:
  • x – JComponent to create the ComponentUI implementation for
Throws:
Returns:ComponentUI implementation for x
/** * Creates the <code>ComponentUI</code> implementation for the passed * in component. * * @param x JComponent to create the ComponentUI implementation for * @return ComponentUI implementation for <code>x</code> * @throws NullPointerException if <code>x</code> is null */
public static ComponentUI createUI(JComponent x) { if (x == null) { throw new NullPointerException("Must pass in a non-null component"); } return new MetalMenuBarUI(); }
Configures the specified component appropriate for the metal look and feel.
Params:
  • c – the component where this UI delegate is being installed
Throws:
/** * Configures the specified component appropriate for the metal look and * feel. * * @param c the component where this UI delegate is being installed * @throws NullPointerException if <code>c</code> is null. */
public void installUI(JComponent c) { super.installUI(c); MetalToolBarUI.register(c); }
Reverses configuration which was done on the specified component during installUI.
Params:
  • c – the component where this UI delegate is being installed
Throws:
/** * Reverses configuration which was done on the specified component during * <code>installUI</code>. * * @param c the component where this UI delegate is being installed * @throws NullPointerException if <code>c</code> is null. */
public void uninstallUI(JComponent c) { super.uninstallUI(c); MetalToolBarUI.unregister(c); }
If necessary paints the background of the component, then invokes paint.
Params:
  • g – Graphics to paint to
  • c – JComponent painting on
Throws:
See Also:
Since:1.5
/** * If necessary paints the background of the component, then * invokes <code>paint</code>. * * @param g Graphics to paint to * @param c JComponent painting on * @throws NullPointerException if <code>g</code> or <code>c</code> is * null * @see javax.swing.plaf.ComponentUI#update * @see javax.swing.plaf.ComponentUI#paint * @since 1.5 */
public void update(Graphics g, JComponent c) { boolean isOpaque = c.isOpaque(); if (g == null) { throw new NullPointerException("Graphics must be non-null"); } if (isOpaque && (c.getBackground() instanceof UIResource) && UIManager.get("MenuBar.gradient") != null) { if (MetalToolBarUI.doesMenuBarBorderToolBar((JMenuBar)c)) { JToolBar tb = (JToolBar)MetalToolBarUI. findRegisteredComponentOfType(c, JToolBar.class); if (tb.isOpaque() &&tb.getBackground() instanceof UIResource) { MetalUtils.drawGradient(c, g, "MenuBar.gradient", 0, 0, c.getWidth(), c.getHeight() + tb.getHeight(), true); paint(g, c); return; } } MetalUtils.drawGradient(c, g, "MenuBar.gradient", 0, 0, c.getWidth(), c.getHeight(),true); paint(g, c); } else { super.update(g, c); } } }