/*

 * Copyright (c) 2011, 2012, 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

 * questions.

 */

package com.apple.laf;

import java.awt.*;

import javax.swing.*;

import javax.swing.plaf.ComponentUI;

import javax.swing.plaf.basic.BasicOptionPaneUI;

public class AquaOptionPaneUI extends BasicOptionPaneUI {

    private static final int kOKCancelButtonWidth = 79;

    private static final int kButtonHeight = 23;

    private static final int kDialogSmallPadding = 4;

    private static final int kDialogLargePadding = 23;

    /**

     * Creates a new BasicOptionPaneUI instance.

     */

    public static ComponentUI createUI(final JComponent x) {

        return new AquaOptionPaneUI();

    }

    /**

     * Creates and returns a Container containin the buttons. The buttons

     * are created by calling {@code getButtons}.

     */

    protected Container createButtonArea() {

        final Container bottom = super.createButtonArea();

        // Now replace the Layout

        bottom.setLayout(new AquaButtonAreaLayout(true, kDialogSmallPadding));

        return bottom;

    }

    /**

     * Messaged from installComponents to create a Container containing the

     * body of the message.

     * The icon and body should be aligned on their top edges

     */

    protected Container createMessageArea() {

        final JPanel top = new JPanel();

        top.setBorder(UIManager.getBorder("OptionPane.messageAreaBorder"));

        top.setLayout(new BoxLayout(top, BoxLayout.X_AXIS));

        /* Fill the body. */

        final Container body = new JPanel();

        final Icon sideIcon = getIcon();

        if (sideIcon != null) {

            final JLabel iconLabel = new JLabel(sideIcon);

            iconLabel.setVerticalAlignment(SwingConstants.TOP);

            final JPanel iconPanel = new JPanel();

            iconPanel.add(iconLabel);

            top.add(iconPanel);

            top.add(Box.createHorizontalStrut(kDialogLargePadding));

        }

        body.setLayout(new GridBagLayout());

        final GridBagConstraints cons = new GridBagConstraints();

        cons.gridx = cons.gridy = 0;

        cons.gridwidth = GridBagConstraints.REMAINDER;

        cons.gridheight = 1;

        cons.anchor = GridBagConstraints.WEST;

        cons.insets = new Insets(0, 0, 3, 0);

        addMessageComponents(body, cons, getMessage(), getMaxCharactersPerLineCount(), false);

        top.add(body);

        return top;

    }

    /**

     * AquaButtonAreaLayout lays out all

     *   components according to the HI Guidelines:

     * The most important button is always on the far right

     * The group of buttons is on the right for left-to-right,

     *         left for right-to-left

     * The widths of each component will be set to the largest preferred size width.

     *

     *

     * This inner class is marked "public" due to a compiler bug.

     * This class should be treated as a "protected" inner class.

     * Instantiate it only within subclasses of BasicOptionPaneUI.

     *

     * BasicOptionPaneUI expects that its buttons are layed out with

     * a subclass of ButtonAreaLayout

     */

    public static class AquaButtonAreaLayout extends ButtonAreaLayout {

        public AquaButtonAreaLayout(final boolean syncAllWidths, final int padding) {

            super(true, padding);

        }

        public void layoutContainer(final Container container) {

            final Component[] children = container.getComponents();

            if (children == null || 0 >= children.length) return;

            final int numChildren = children.length;

            final int yLocation = container.getInsets().top;

            // Always syncAllWidths - and heights!

            final Dimension maxSize = new Dimension(kOKCancelButtonWidth, kButtonHeight);

            for (int i = 0; i < numChildren; i++) {

                final Dimension sizes = children[i].getPreferredSize();

                maxSize.width = Math.max(maxSize.width, sizes.width);

                maxSize.height = Math.max(maxSize.height, sizes.height);

            }

            // ignore getCentersChildren, because we don't

            int xLocation = container.getSize().width - (maxSize.width * numChildren + (numChildren - 1) * padding);

            final int xOffset = maxSize.width + padding;

            // most important button (button zero) on far right

            for (int i = numChildren - 1; i >= 0; i--) {

                children[i].setBounds(xLocation, yLocation, maxSize.width, maxSize.height);

                xLocation += xOffset;

            }

        }

    }

}