/*

 * Copyright (c) 2002, 2013, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

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 */

package javax.swing.plaf.synth;

import javax.swing.*;

import java.awt.Graphics;

import java.beans.PropertyChangeEvent;

import java.beans.PropertyChangeListener;

import javax.swing.plaf.*;

import javax.swing.plaf.basic.*;

/**

 * Provides the Synth L&F UI delegate for

 * {@link javax.swing.JMenuBar}.

 *

 * @author Scott Violet

 * @since 1.7

 */

public class SynthMenuBarUI extends BasicMenuBarUI

                            implements PropertyChangeListener, SynthUI {

    private SynthStyle style;

    /**

     * Creates a new UI object for the given component.

     *

     * @param x component to create UI object for

     * @return the UI object

     */

    public static ComponentUI createUI(JComponent x) {

        return new SynthMenuBarUI();

    }

    /**

     * {@inheritDoc}

     */

    @Override

    protected void installDefaults() {

        if (menuBar.getLayout() == null ||

            menuBar.getLayout() instanceof UIResource) {

            menuBar.setLayout(new SynthMenuLayout(menuBar,BoxLayout.LINE_AXIS));

        }

        updateStyle(menuBar);

    }

    /**

     * {@inheritDoc}

     */

    @Override

    protected void installListeners() {

        super.installListeners();

        menuBar.addPropertyChangeListener(this);

    }

    private void updateStyle(JMenuBar c) {

        SynthContext context = getContext(c, ENABLED);

        SynthStyle oldStyle = style;

        style = SynthLookAndFeel.updateStyle(context, this);

        if (style != oldStyle) {

            if (oldStyle != null) {

                uninstallKeyboardActions();

                installKeyboardActions();

            }

        }

        context.dispose();

    }

    /**

     * {@inheritDoc}

     */

    @Override

    protected void uninstallDefaults() {

        SynthContext context = getContext(menuBar, ENABLED);

        style.uninstallDefaults(context);

        context.dispose();

        style = null;

    }

    /**

     * {@inheritDoc}

     */

    @Override

    protected void uninstallListeners() {

        super.uninstallListeners();

        menuBar.removePropertyChangeListener(this);

    }

    /**

     * {@inheritDoc}

     */

    @Override

    public SynthContext getContext(JComponent c) {

        return getContext(c, getComponentState(c));

    }

    private SynthContext getContext(JComponent c, int state) {

        return SynthContext.getContext(SynthContext.class, c,

                    SynthLookAndFeel.getRegion(c), style, state);

    }

    private int getComponentState(JComponent c) {

        return SynthLookAndFeel.getComponentState(c);

    }

    /**

     * Notifies this UI delegate to repaint the specified component.

     * This method paints the component background, then calls

     * the {@link #paint(SynthContext,Graphics)} method.

     *

     * <p>In general, this method does not need to be overridden by subclasses.

     * All Look and Feel rendering code should reside in the {@code paint} method.

     *

     * @param g the {@code Graphics} object used for painting

     * @param c the component being painted

     * @see #paint(SynthContext,Graphics)

     */

    @Override

    public void update(Graphics g, JComponent c) {

        SynthContext context = getContext(c);

        SynthLookAndFeel.update(context, g);

        context.getPainter().paintMenuBarBackground(context,

                          g, 0, 0, c.getWidth(), c.getHeight());

        paint(context, g);

        context.dispose();

    }

    /**

     * Paints the specified component according to the Look and Feel.

     * <p>This method is not used by Synth Look and Feel.

     * Painting is handled by the {@link #paint(SynthContext,Graphics)} method.

     *

     * @param g the {@code Graphics} object used for painting

     * @param c the component being painted

     * @see #paint(SynthContext,Graphics)

     */

    @Override

    public void paint(Graphics g, JComponent c) {

        SynthContext context = getContext(c);

        paint(context, g);

        context.dispose();

    }

    /**

     * Paints the specified component. This implementation does nothing.

     *

     * @param context context for the component being painted

     * @param g the {@code Graphics} object used for painting

     * @see #update(Graphics,JComponent)

     */

    protected void paint(SynthContext context, Graphics g) {

    }

    /**

     * {@inheritDoc}

     */

    @Override

    public void paintBorder(SynthContext context, Graphics g, int x,

                            int y, int w, int h) {

        context.getPainter().paintMenuBarBorder(context, g, x, y, w, h);

    }

    /**

     * {@inheritDoc}

     */

    @Override

    public void propertyChange(PropertyChangeEvent e) {

        if (SynthLookAndFeel.shouldUpdateStyle(e)) {

            updateStyle((JMenuBar)e.getSource());

        }

    }

}