/*

 * Copyright (c) 1998, 2014, 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

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 */

package javax.swing.plaf.metal;

import sun.swing.SwingUtilities2;

import sun.awt.AppContext;

import javax.swing.*;

import javax.swing.border.*;

import javax.swing.plaf.basic.*;

import java.awt.*;

import java.awt.event.*;

import java.beans.*;

import javax.swing.plaf.*;

/**

 * MetalButtonUI implementation

 * <p>

 * <strong>Warning:</strong>

 * Serialized objects of this class will not be compatible with

 * future Swing releases. The current serialization support is

 * appropriate for short term storage or RMI between applications running

 * the same version of Swing.  As of 1.4, support for long term storage

 * of all JavaBeans™

 * has been added to the <code>java.beans</code> package.

 * Please see {@link java.beans.XMLEncoder}.

 *

 * @author Tom Santos

 */

@SuppressWarnings("serial") // Same-version serialization only

public class MetalButtonUI extends BasicButtonUI {

    // NOTE: These are not really needed, but at this point we can't pull

    // them. Their values are updated purely for historical reasons.

    protected Color focusColor;

    protected Color selectColor;

    protected Color disabledTextColor;

    private static final Object METAL_BUTTON_UI_KEY = new Object();

    // ********************************

    //          Create PLAF

    // ********************************

    public static ComponentUI createUI(JComponent c) {

        AppContext appContext = AppContext.getAppContext();

        MetalButtonUI metalButtonUI =

                (MetalButtonUI) appContext.get(METAL_BUTTON_UI_KEY);

        if (metalButtonUI == null) {

            metalButtonUI = new MetalButtonUI();

            appContext.put(METAL_BUTTON_UI_KEY, metalButtonUI);

        }

        return metalButtonUI;

    }

    // ********************************

    //          Install

    // ********************************

    public void installDefaults(AbstractButton b) {

        super.installDefaults(b);

    }

    public void uninstallDefaults(AbstractButton b) {

        super.uninstallDefaults(b);

    }

    // ********************************

    //         Create Listeners

    // ********************************

    protected BasicButtonListener createButtonListener(AbstractButton b) {

        return super.createButtonListener(b);

    }

    // ********************************

    //         Default Accessors

    // ********************************

    protected Color getSelectColor() {

        selectColor = UIManager.getColor(getPropertyPrefix() + "select");

        return selectColor;

    }

    protected Color getDisabledTextColor() {

        disabledTextColor = UIManager.getColor(getPropertyPrefix() +

                                               "disabledText");

        return disabledTextColor;

    }

    protected Color getFocusColor() {

        focusColor = UIManager.getColor(getPropertyPrefix() + "focus");

        return focusColor;

    }

    // ********************************

    //          Paint

    // ********************************

    /**

     * 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) {

        AbstractButton button = (AbstractButton)c;

        if ((c.getBackground() instanceof UIResource) &&

                  button.isContentAreaFilled() && c.isEnabled()) {

            ButtonModel model = button.getModel();

            if (!MetalUtils.isToolBarButton(c)) {

                if (!model.isArmed() && !model.isPressed() &&

                        MetalUtils.drawGradient(

                        c, g, "Button.gradient", 0, 0, c.getWidth(),

                        c.getHeight(), true)) {

                    paint(g, c);

                    return;

                }

            }

            else if (model.isRollover() && MetalUtils.drawGradient(

                        c, g, "Button.gradient", 0, 0, c.getWidth(),

                        c.getHeight(), true)) {

                paint(g, c);

                return;

            }

        }

        super.update(g, c);

    }

    protected void paintButtonPressed(Graphics g, AbstractButton b) {

        if ( b.isContentAreaFilled() ) {

            Dimension size = b.getSize();

            g.setColor(getSelectColor());

            g.fillRect(0, 0, size.width, size.height);

        }

    }

    protected void paintFocus(Graphics g, AbstractButton b,

                              Rectangle viewRect, Rectangle textRect, Rectangle iconRect){

        Rectangle focusRect = new Rectangle();

        String text = b.getText();

        boolean isIcon = b.getIcon() != null;

        // If there is text

        if ( text != null && !text.equals( "" ) ) {

            if ( !isIcon ) {

                focusRect.setBounds( textRect );

            }

            else {

                focusRect.setBounds( iconRect.union( textRect ) );

            }

        }

        // If there is an icon and no text

        else if ( isIcon ) {

            focusRect.setBounds( iconRect );

        }

        g.setColor(getFocusColor());

        g.drawRect((focusRect.x-1), (focusRect.y-1),

                  focusRect.width+1, focusRect.height+1);

    }

    protected void paintText(Graphics g, JComponent c, Rectangle textRect, String text) {

        AbstractButton b = (AbstractButton) c;

        ButtonModel model = b.getModel();

        FontMetrics fm = SwingUtilities2.getFontMetrics(c, g);

        int mnemIndex = b.getDisplayedMnemonicIndex();

        /* Draw the Text */

        if(model.isEnabled()) {

            /*** paint the text normally */

            g.setColor(b.getForeground());

        }

        else {

            /*** paint the text disabled ***/

            g.setColor(getDisabledTextColor());

        }

        SwingUtilities2.drawStringUnderlineCharAt(c, g,text,mnemIndex,

                                  textRect.x, textRect.y + fm.getAscent());

    }

}