/*

 * Copyright (c) 2002, 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

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

 * questions.

 */

package javax.swing.plaf.synth;

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import javax.swing.plaf.*;

import javax.swing.plaf.basic.BasicInternalFrameTitlePane;

import java.beans.PropertyChangeListener;

import java.beans.PropertyChangeEvent;

import java.beans.PropertyVetoException;

import sun.swing.SwingUtilities2;

/**

 * The class that manages a synth title bar

 *

 * @author David Kloba

 * @author Joshua Outwater

 * @author Steve Wilson

 */

@SuppressWarnings("serial") // Superclass is not serializable across versions

class SynthInternalFrameTitlePane extends BasicInternalFrameTitlePane

        implements SynthUI, PropertyChangeListener {

    protected JPopupMenu systemPopupMenu;

    protected JButton menuButton;

    private SynthStyle style;

    private int titleSpacing;

    private int buttonSpacing;

    // Alignment for the title, one of SwingConstants.(LEADING|TRAILING|CENTER)

    private int titleAlignment;

    public SynthInternalFrameTitlePane(JInternalFrame f) {

        super(f);

    }

    public String getUIClassID() {

        return "InternalFrameTitlePaneUI";

    }

    public SynthContext getContext(JComponent c) {

        return getContext(c, getComponentState(c));

    }

    public SynthContext getContext(JComponent c, int state) {

        return SynthContext.getContext(c, style, state);

    }

    private Region getRegion(JComponent c) {

        return SynthLookAndFeel.getRegion(c);

    }

    private int getComponentState(JComponent c) {

        if (frame != null) {

            if (frame.isSelected()) {

                return SELECTED;

            }

        }

        return SynthLookAndFeel.getComponentState(c);

    }

    protected void addSubComponents() {

        menuButton.setName("InternalFrameTitlePane.menuButton");

        iconButton.setName("InternalFrameTitlePane.iconifyButton");

        maxButton.setName("InternalFrameTitlePane.maximizeButton");

        closeButton.setName("InternalFrameTitlePane.closeButton");

        add(menuButton);

        add(iconButton);

        add(maxButton);

        add(closeButton);

    }

    protected void installListeners() {

        super.installListeners();

        frame.addPropertyChangeListener(this);

        addPropertyChangeListener(this);

    }

    protected void uninstallListeners() {

        frame.removePropertyChangeListener(this);

        removePropertyChangeListener(this);

        super.uninstallListeners();

    }

    private void updateStyle(JComponent c) {

        SynthContext context = getContext(this, ENABLED);

        SynthStyle oldStyle = style;

        style = SynthLookAndFeel.updateStyle(context, this);

        if (style != oldStyle) {

            maxIcon =

                style.getIcon(context,"InternalFrameTitlePane.maximizeIcon");

            minIcon =

                style.getIcon(context,"InternalFrameTitlePane.minimizeIcon");

            iconIcon =

                style.getIcon(context,"InternalFrameTitlePane.iconifyIcon");

            closeIcon =

                style.getIcon(context,"InternalFrameTitlePane.closeIcon");

            titleSpacing = style.getInt(context,

                              "InternalFrameTitlePane.titleSpacing", 2);

            buttonSpacing = style.getInt(context,

                              "InternalFrameTitlePane.buttonSpacing", 2);

            String alignString = (String)style.get(context,

                              "InternalFrameTitlePane.titleAlignment");

            titleAlignment = SwingConstants.LEADING;

            if (alignString != null) {

                alignString = alignString.toUpperCase();

                if (alignString.equals("TRAILING")) {

                    titleAlignment = SwingConstants.TRAILING;

                }

                else if (alignString.equals("CENTER")) {

                    titleAlignment = SwingConstants.CENTER;

                }

            }

        }

    }

    protected void installDefaults() {

        super.installDefaults();

        updateStyle(this);

    }

    protected void uninstallDefaults() {

        SynthContext context = getContext(this, ENABLED);

        style.uninstallDefaults(context);

        style = null;

        JInternalFrame.JDesktopIcon di = frame.getDesktopIcon();

        if(di != null && di.getComponentPopupMenu() == systemPopupMenu) {

            // Release link to systemMenu from the JInternalFrame

            di.setComponentPopupMenu(null);

        }

        super.uninstallDefaults();

    }

    @SuppressWarnings("serial") // Superclass is not serializable across versions

    private static class JPopupMenuUIResource extends JPopupMenu implements

        UIResource { }

    protected void assembleSystemMenu() {

        systemPopupMenu = new JPopupMenuUIResource();

        addSystemMenuItems(systemPopupMenu);

        enableActions();

        menuButton = createNoFocusButton();

        updateMenuIcon();

        menuButton.addMouseListener(new MouseAdapter() {

            public void mousePressed(MouseEvent e) {

                try {

                    frame.setSelected(true);

                } catch(PropertyVetoException pve) {

                }

                showSystemMenu();

            }

        });

        JPopupMenu p = frame.getComponentPopupMenu();

        if (p == null || p instanceof UIResource) {

            frame.setComponentPopupMenu(systemPopupMenu);

        }

        if (frame.getDesktopIcon() != null) {

            p = frame.getDesktopIcon().getComponentPopupMenu();

            if (p == null || p instanceof UIResource) {

                frame.getDesktopIcon().setComponentPopupMenu(systemPopupMenu);

            }

        }

        setInheritsPopupMenu(true);

    }

    protected void addSystemMenuItems(JPopupMenu menu) {

        JMenuItem mi = menu.add(restoreAction);

        mi.setMnemonic(getButtonMnemonic("restore"));

        mi = menu.add(moveAction);

        mi.setMnemonic(getButtonMnemonic("move"));

        mi = menu.add(sizeAction);

        mi.setMnemonic(getButtonMnemonic("size"));

        mi = menu.add(iconifyAction);

        mi.setMnemonic(getButtonMnemonic("minimize"));

        mi = menu.add(maximizeAction);

        mi.setMnemonic(getButtonMnemonic("maximize"));

        menu.add(new JSeparator());

        mi = menu.add(closeAction);

        mi.setMnemonic(getButtonMnemonic("close"));

    }

    private static int getButtonMnemonic(String button) {

        try {

            return Integer.parseInt(UIManager.getString(

                    "InternalFrameTitlePane." + button + "Button.mnemonic"));

        } catch (NumberFormatException e) {

            return -1;

        }

    }

    protected void showSystemMenu() {

        Insets insets = frame.getInsets();

        if (!frame.isIcon()) {

            systemPopupMenu.show(frame, menuButton.getX(), getY() + getHeight());

        } else {

            systemPopupMenu.show(menuButton,

                getX() - insets.left - insets.right,

                getY() - systemPopupMenu.getPreferredSize().height -

                    insets.bottom - insets.top);

        }

    }

    // SynthInternalFrameTitlePane has no UI, we'll invoke paint on it.

    public void paintComponent(Graphics g) {

        SynthContext context = getContext(this);

        SynthLookAndFeel.update(context, g);

        context.getPainter().paintInternalFrameTitlePaneBackground(context,

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

        paint(context, g);

    }

    protected void paint(SynthContext context, Graphics g) {

        String title = frame.getTitle();

        if (title != null) {

            SynthStyle style = context.getStyle();

            g.setColor(style.getColor(context, ColorType.TEXT_FOREGROUND));

            g.setFont(style.getFont(context));

            // Center text vertically.

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

            int baseline = (getHeight() + fm.getAscent() - fm.getLeading() -

                            fm.getDescent()) / 2;

            JButton lastButton = null;

            if (frame.isIconifiable()) {

                lastButton = iconButton;

            }

            else if (frame.isMaximizable()) {

                lastButton = maxButton;

            }

            else if (frame.isClosable()) {

                lastButton = closeButton;

            }

            int maxX;

            int minX;

            boolean ltr = SynthLookAndFeel.isLeftToRight(frame);

            int titleAlignment = this.titleAlignment;

            if (ltr) {

                if (lastButton != null) {

                    maxX = lastButton.getX() - titleSpacing;

                }

                else {

                    maxX = frame.getWidth() - frame.getInsets().right -

                           titleSpacing;

                }

                minX = menuButton.getX() + menuButton.getWidth() +

                       titleSpacing;

            }

            else {

                if (lastButton != null) {

                    minX = lastButton.getX() + lastButton.getWidth() +

                           titleSpacing;

                }

                else {

                    minX = frame.getInsets().left + titleSpacing;

                }

                maxX = menuButton.getX() - titleSpacing;

                if (titleAlignment == SwingConstants.LEADING) {

                    titleAlignment = SwingConstants.TRAILING;

                }

                else if (titleAlignment == SwingConstants.TRAILING) {

                    titleAlignment = SwingConstants.LEADING;

                }

            }

            String clippedTitle = getTitle(title, fm, maxX - minX);

            if (clippedTitle == title) {

                // String fit, align as necessary.

                if (titleAlignment == SwingConstants.TRAILING) {

                    minX = maxX - style.getGraphicsUtils(context).

                        computeStringWidth(context, g.getFont(), fm, title);

                }

                else if (titleAlignment == SwingConstants.CENTER) {

                    int width = style.getGraphicsUtils(context).

                           computeStringWidth(context, g.getFont(), fm, title);

                    minX = Math.max(minX, (getWidth() - width) / 2);

                    minX = Math.min(maxX - width, minX);

                }

            }

            style.getGraphicsUtils(context).paintText(

                context, g, clippedTitle, minX, baseline - fm.getAscent(), -1);

        }

    }

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

                            int y, int w, int h) {

        context.getPainter().paintInternalFrameTitlePaneBorder(context,

                                                            g, x, y, w, h);

    }

    protected LayoutManager createLayout() {

        SynthContext context = getContext(this);

        LayoutManager lm =

            (LayoutManager)style.get(context, "InternalFrameTitlePane.titlePaneLayout");

        return (lm != null) ? lm : new SynthTitlePaneLayout();

    }

    public void propertyChange(PropertyChangeEvent evt) {

        if (evt.getSource() == this) {

            if (SynthLookAndFeel.shouldUpdateStyle(evt)) {

                updateStyle(this);

            }

        }

        else {

            // Changes for the internal frame

            if (evt.getPropertyName() == JInternalFrame.FRAME_ICON_PROPERTY) {

                updateMenuIcon();

            }

        }

    }

    /**

     * Resets the menuButton icon to match that of the frame.

     */

    private void updateMenuIcon() {

        Icon frameIcon = frame.getFrameIcon();

        SynthContext context = getContext(this);

        if (frameIcon != null) {

            Dimension maxSize = (Dimension)context.getStyle().get(context,

                                "InternalFrameTitlePane.maxFrameIconSize");

            int maxWidth = 16;

            int maxHeight = 16;

            if (maxSize != null) {

                maxWidth = maxSize.width;

                maxHeight = maxSize.height;

            }

            if ((frameIcon.getIconWidth() > maxWidth ||

                     frameIcon.getIconHeight() > maxHeight) &&

                    (frameIcon instanceof ImageIcon)) {

                frameIcon = new ImageIcon(((ImageIcon)frameIcon).

                             getImage().getScaledInstance(maxWidth, maxHeight,

                             Image.SCALE_SMOOTH));

            }

        }

        menuButton.setIcon(frameIcon);

    }

    class SynthTitlePaneLayout implements LayoutManager {

        public void addLayoutComponent(String name, Component c) {}

        public void removeLayoutComponent(Component c) {}

        public Dimension preferredLayoutSize(Container c)  {

            return minimumLayoutSize(c);

        }

        public Dimension minimumLayoutSize(Container c) {

            SynthContext context = getContext(

                             SynthInternalFrameTitlePane.this);

            int width = 0;

            int height = 0;

            int buttonCount = 0;

            Dimension pref;

            if (frame.isClosable()) {

                pref = closeButton.getPreferredSize();

                width += pref.width;

                height = Math.max(pref.height, height);

                buttonCount++;

            }

            if (frame.isMaximizable()) {

                pref = maxButton.getPreferredSize();

                width += pref.width;

                height = Math.max(pref.height, height);

                buttonCount++;

            }

            if (frame.isIconifiable()) {

                pref = iconButton.getPreferredSize();

                width += pref.width;

                height = Math.max(pref.height, height);

                buttonCount++;

            }

            pref = menuButton.getPreferredSize();

            width += pref.width;

            height = Math.max(pref.height, height);

            width += Math.max(0, (buttonCount - 1) * buttonSpacing);

            FontMetrics fm = SynthInternalFrameTitlePane.this.getFontMetrics(

                                          getFont());

            SynthGraphicsUtils graphicsUtils = context.getStyle().

                                       getGraphicsUtils(context);

            String frameTitle = frame.getTitle();

            int title_w = frameTitle != null ? graphicsUtils.

                               computeStringWidth(context, fm.getFont(),

                               fm, frameTitle) : 0;

            int title_length = frameTitle != null ? frameTitle.length() : 0;

            // Leave room for three characters in the title.

            if (title_length > 3) {

                int subtitle_w = graphicsUtils.computeStringWidth(context,

                    fm.getFont(), fm, frameTitle.substring(0, 3) + "...");

                width += (title_w < subtitle_w) ? title_w : subtitle_w;

            } else {

                width += title_w;

            }

            height = Math.max(fm.getHeight() + 2, height);

            width += titleSpacing + titleSpacing;

            Insets insets = getInsets();

            height += insets.top + insets.bottom;

            width += insets.left + insets.right;

            return new Dimension(width, height);

        }

        private int center(Component c, Insets insets, int x,

                           boolean trailing) {

            Dimension pref = c.getPreferredSize();

            if (trailing) {

                x -= pref.width;

            }

            c.setBounds(x, insets.top +

                        (getHeight() - insets.top - insets.bottom -

                         pref.height) / 2, pref.width, pref.height);

            if (pref.width > 0) {

                if (trailing) {

                    return x - buttonSpacing;

                }

                return x + pref.width + buttonSpacing;

            }

            return x;

        }

        public void layoutContainer(Container c) {

            Insets insets = c.getInsets();

            Dimension pref;

            if (SynthLookAndFeel.isLeftToRight(frame)) {

                center(menuButton, insets, insets.left, false);

                int x = getWidth() - insets.right;

                if (frame.isClosable()) {

                    x = center(closeButton, insets, x, true);

                }

                if (frame.isMaximizable()) {

                    x = center(maxButton, insets, x, true);

                }

                if (frame.isIconifiable()) {

                    x = center(iconButton, insets, x, true);

                }

            }

            else {

                center(menuButton, insets, getWidth() - insets.right,

                       true);

                int x = insets.left;

                if (frame.isClosable()) {

                    x = center(closeButton, insets, x, false);

                }

                if (frame.isMaximizable()) {

                    x = center(maxButton, insets, x, false);

                }

                if (frame.isIconifiable()) {

                    x = center(iconButton, insets, x, false);

                }

            }

        }

    }

    private JButton createNoFocusButton() {

        JButton button = new JButton();

        button.setFocusable(false);

        button.setMargin(new Insets(0,0,0,0));

        return button;

    }

}