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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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package javax.swing.plaf.synth;

import javax.swing.*;
import javax.swing.border.*;
import javax.swing.plaf.*;
import javax.swing.plaf.basic.BasicDesktopPaneUI;
import java.beans.*;
import java.awt.event.*;
import java.awt.*;

Provides the Synth L&F UI delegate for JDesktopPane. 
Author:
Joshua Outwater, Steve Wilson
Since:
1.7/**
 * Provides the Synth L&F UI delegate for
 * {@link javax.swing.JDesktopPane}.
 *
 * @author Joshua Outwater
 * @author Steve Wilson
 * @since 1.7
 */
public class SynthDesktopPaneUI extends BasicDesktopPaneUI implements
                  PropertyChangeListener, SynthUI {
    private SynthStyle style;
    private TaskBar taskBar;
    private DesktopManager oldDesktopManager;

    
Creates a new UI object for the given component.
Params:
c – component to create UI object for
Returns:
the UI object/**
     * Creates a new UI object for the given component.
     *
     * @param c component to create UI object for
     * @return the UI object
     */
    public static ComponentUI createUI(JComponent c) {
        return new SynthDesktopPaneUI();
    }

    
{@inheritDoc}
/**
     * {@inheritDoc}
     */
    @Override
    protected void installListeners() {
        super.installListeners();
        desktop.addPropertyChangeListener(this);
        if (taskBar != null) {
            // Listen for desktop being resized
            desktop.addComponentListener(taskBar);
            // Listen for frames being added to desktop
            desktop.addContainerListener(taskBar);
        }
    }

    
{@inheritDoc}
/**
     * {@inheritDoc}
     */
    @Override
    protected void installDefaults() {
        updateStyle(desktop);

        if (UIManager.getBoolean("InternalFrame.useTaskBar")) {
            taskBar = new TaskBar();

            for (Component comp : desktop.getComponents()) {
                JInternalFrame.JDesktopIcon desktopIcon;

                if (comp instanceof JInternalFrame.JDesktopIcon) {
                    desktopIcon = (JInternalFrame.JDesktopIcon)comp;
                } else if (comp instanceof JInternalFrame) {
                    desktopIcon = ((JInternalFrame)comp).getDesktopIcon();
                } else {
                    continue;
                }
                // Move desktopIcon from desktop to taskBar
                if (desktopIcon.getParent() == desktop) {
                    desktop.remove(desktopIcon);
                }
                if (desktopIcon.getParent() != taskBar) {
                    taskBar.add(desktopIcon);
                    desktopIcon.getInternalFrame().addComponentListener(
                        taskBar);
                }
            }
            taskBar.setBackground(desktop.getBackground());
            desktop.add(taskBar,
                Integer.valueOf(JLayeredPane.PALETTE_LAYER.intValue() + 1));
            if (desktop.isShowing()) {
                taskBar.adjustSize();
            }
        }
    }

    private void updateStyle(JDesktopPane c) {
        SynthStyle oldStyle = style;
        SynthContext context = getContext(c, ENABLED);
        style = SynthLookAndFeel.updateStyle(context, this);
        if (oldStyle != null) {
            uninstallKeyboardActions();
            installKeyboardActions();
        }
        context.dispose();
    }

    
{@inheritDoc}
/**
     * {@inheritDoc}
     */
    @Override
    protected void uninstallListeners() {
        if (taskBar != null) {
            desktop.removeComponentListener(taskBar);
            desktop.removeContainerListener(taskBar);
        }
        desktop.removePropertyChangeListener(this);
        super.uninstallListeners();
    }

    
{@inheritDoc}
/**
     * {@inheritDoc}
     */
    @Override
    protected void uninstallDefaults() {
        SynthContext context = getContext(desktop, ENABLED);

        style.uninstallDefaults(context);
        context.dispose();
        style = null;

        if (taskBar != null) {
            for (Component comp : taskBar.getComponents()) {
                JInternalFrame.JDesktopIcon desktopIcon =
                    (JInternalFrame.JDesktopIcon)comp;
                taskBar.remove(desktopIcon);
                desktopIcon.setPreferredSize(null);
                JInternalFrame f = desktopIcon.getInternalFrame();
                if (f.isIcon()) {
                    desktop.add(desktopIcon);
                }
                f.removeComponentListener(taskBar);
            }
            desktop.remove(taskBar);
            taskBar = null;
        }
    }

    
{@inheritDoc}
/**
     * {@inheritDoc}
     */
    @Override
    protected void installDesktopManager() {
        if (UIManager.getBoolean("InternalFrame.useTaskBar")) {
            desktopManager = oldDesktopManager = desktop.getDesktopManager();
            if (!(desktopManager instanceof SynthDesktopManager)) {
                desktopManager = new SynthDesktopManager();
                desktop.setDesktopManager(desktopManager);
            }
        } else {
            super.installDesktopManager();
        }
    }

    
{@inheritDoc}
/**
     * {@inheritDoc}
     */
    @Override
    protected void uninstallDesktopManager() {
        if (oldDesktopManager != null && !(oldDesktopManager instanceof UIResource)) {
            desktopManager = desktop.getDesktopManager();
            if (desktopManager == null || desktopManager instanceof UIResource) {
                desktop.setDesktopManager(oldDesktopManager);
            }
        }
        oldDesktopManager = null;
        super.uninstallDesktopManager();
    }

    static class TaskBar extends JPanel implements ComponentListener, ContainerListener {
        TaskBar() {
            setOpaque(true);
            setLayout(new FlowLayout(FlowLayout.LEFT, 0, 0) {
                public void layoutContainer(Container target) {
                    // First shrink buttons to fit
                    Component[] comps = target.getComponents();
                    int n = comps.length;
                    if (n > 0) {
                        // Start with the largest preferred width
                        int prefWidth = 0;
                        for (Component c : comps) {
                            c.setPreferredSize(null);
                            Dimension prefSize = c.getPreferredSize();
                            if (prefSize.width > prefWidth) {
                                prefWidth = prefSize.width;
                            }
                        }
                        // Shrink equally to fit if needed
                        Insets insets = target.getInsets();
                        int tw = target.getWidth() - insets.left - insets.right;
                        int w = Math.min(prefWidth, Math.max(10, tw/n));
                        for (Component c : comps) {
                            Dimension prefSize = c.getPreferredSize();
                            c.setPreferredSize(new Dimension(w, prefSize.height));
                        }
                    }
                    super.layoutContainer(target);
                }
            });

            // PENDING: This should be handled by the painter
            setBorder(new BevelBorder(BevelBorder.RAISED) {
                protected void paintRaisedBevel(Component c, Graphics g,
                                                int x, int y, int w, int h)  {
                    Color oldColor = g.getColor();
                    g.translate(x, y);
                    g.setColor(getHighlightOuterColor(c));
                    g.drawLine(0, 0, 0, h-2);
                    g.drawLine(1, 0, w-2, 0);
                    g.setColor(getShadowOuterColor(c));
                    g.drawLine(0, h-1, w-1, h-1);
                    g.drawLine(w-1, 0, w-1, h-2);
                    g.translate(-x, -y);
                    g.setColor(oldColor);
                }
            });
        }

        void adjustSize() {
            JDesktopPane desktop = (JDesktopPane)getParent();
            if (desktop != null) {
                int height = getPreferredSize().height;
                Insets insets = getInsets();
                if (height == insets.top + insets.bottom) {
                    if (getHeight() <= height) {
                        // Initial size, because we have no buttons yet
                        height += 21;
                    } else {
                        // We already have a good height
                        height = getHeight();
                    }
                }
                setBounds(0, desktop.getHeight() - height, desktop.getWidth(), height);
                revalidate();
                repaint();
            }
        }

        // ComponentListener interface

        public void componentResized(ComponentEvent e) {
            if (e.getSource() instanceof JDesktopPane) {
                adjustSize();
            }
        }

        public void componentMoved(ComponentEvent e){}

        public void componentShown(ComponentEvent e) {
            if (e.getSource() instanceof JInternalFrame) {
                adjustSize();
            }
        }

        public void componentHidden(ComponentEvent e) {
            if (e.getSource() instanceof JInternalFrame) {
                ((JInternalFrame)e.getSource()).getDesktopIcon().setVisible(false);
                revalidate();
            }
        }

        // ContainerListener interface

        public void componentAdded(ContainerEvent e) {
            if (e.getChild() instanceof JInternalFrame) {
                JDesktopPane desktop = (JDesktopPane)e.getSource();
                JInternalFrame f = (JInternalFrame)e.getChild();
                JInternalFrame.JDesktopIcon desktopIcon = f.getDesktopIcon();
                for (Component comp : getComponents()) {
                    if (comp == desktopIcon) {
                        // We have it already
                        return;
                    }
                }
                add(desktopIcon);
                f.addComponentListener(this);
                if (getComponentCount() == 1) {
                    adjustSize();
                }
            }
        }

        public void componentRemoved(ContainerEvent e) {
            if (e.getChild() instanceof JInternalFrame) {
                JInternalFrame f = (JInternalFrame)e.getChild();
                if (!f.isIcon()) {
                    // Frame was removed without using setClosed(true)
                    remove(f.getDesktopIcon());
                    f.removeComponentListener(this);
                    revalidate();
                    repaint();
                }
            }
        }
    }


    class SynthDesktopManager extends DefaultDesktopManager implements UIResource {

        public void maximizeFrame(JInternalFrame f) {
            if (f.isIcon()) {
                try {
                    f.setIcon(false);
                } catch (PropertyVetoException e2) {
                }
            } else {
                f.setNormalBounds(f.getBounds());
                Component desktop = f.getParent();
                setBoundsForFrame(f, 0, 0,
                                  desktop.getWidth(),
                                  desktop.getHeight() - taskBar.getHeight());
            }

            try {
                f.setSelected(true);
            } catch (PropertyVetoException e2) {
            }
        }

        public void iconifyFrame(JInternalFrame f) {
            JInternalFrame.JDesktopIcon desktopIcon;
            Container c = f.getParent();
            JDesktopPane d = f.getDesktopPane();
            boolean findNext = f.isSelected();

            if (c == null) {
                return;
            }

            desktopIcon = f.getDesktopIcon();

            if (!f.isMaximum()) {
                f.setNormalBounds(f.getBounds());
            }
            c.remove(f);
            c.repaint(f.getX(), f.getY(), f.getWidth(), f.getHeight());
            try {
                f.setSelected(false);
            } catch (PropertyVetoException e2) {
            }

            // Get topmost of the remaining frames
            if (findNext) {
                for (Component comp : c.getComponents()) {
                    if (comp instanceof JInternalFrame) {
                        try {
                            ((JInternalFrame)comp).setSelected(true);
                        } catch (PropertyVetoException e2) {
                        }
                        ((JInternalFrame)comp).moveToFront();
                        return;
                    }
                }
            }
        }


        public void deiconifyFrame(JInternalFrame f) {
            JInternalFrame.JDesktopIcon desktopIcon = f.getDesktopIcon();
            Container c = desktopIcon.getParent();
            if (c != null) {
                c = c.getParent();
                if (c != null) {
                    c.add(f);
                    if (f.isMaximum()) {
                        int w = c.getWidth();
                        int h = c.getHeight() - taskBar.getHeight();
                        if (f.getWidth() != w || f.getHeight() != h) {
                            setBoundsForFrame(f, 0, 0, w, h);
                        }
                    }
                    if (f.isSelected()) {
                        f.moveToFront();
                    } else {
                        try {
                            f.setSelected(true);
                        } catch (PropertyVetoException e2) {
                        }
                    }
                }
            }
        }

        protected void removeIconFor(JInternalFrame f) {
            super.removeIconFor(f);
            taskBar.validate();
        }

        public void setBoundsForFrame(JComponent f, int newX, int newY, int newWidth, int newHeight) {
            super.setBoundsForFrame(f, newX, newY, newWidth, newHeight);
            if (taskBar != null && newY >= taskBar.getY()) {
                f.setLocation(f.getX(), taskBar.getY()-f.getInsets().top);
            }
        }
    }

    
{@inheritDoc}
/**
     * {@inheritDoc}
     */
    @Override
    public SynthContext getContext(JComponent c) {
        return getContext(c, getComponentState(c));
    }

    private SynthContext getContext(JComponent c, int state) {
        return SynthContext.getContext(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 paint(SynthContext, Graphics) method. 
In general, this method does not need to be overridden by subclasses. All Look and Feel rendering code should reside in the paint method. 
Params:
g – the Graphics object used for painting
c – the component being painted
See Also:
paint(SynthContext, Graphics)/**
     * 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().paintDesktopPaneBackground(context, g, 0, 0,
                                                  c.getWidth(), c.getHeight());
        paint(context, g);
        context.dispose();
    }

    
Paints the specified component according to the Look and Feel.
This method is not used by Synth Look and Feel. Painting is handled by the paint(SynthContext, Graphics) method. 
Params:
g – the Graphics object used for painting
c – the component being painted
See Also:
paint(SynthContext, Graphics)/**
     * 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.
Params:
context – context for the component being painted
g – the Graphics object used for painting
See Also:
update(Graphics, JComponent)/**
     * 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}
/**
     * {@inheritDoc}
     */
    @Override
    public void paintBorder(SynthContext context, Graphics g, int x,
                            int y, int w, int h) {
        context.getPainter().paintDesktopPaneBorder(context, g, x, y, w, h);
    }

    
{@inheritDoc}
/**
     * {@inheritDoc}
     */
    @Override
    public void propertyChange(PropertyChangeEvent evt) {
        if (SynthLookAndFeel.shouldUpdateStyle(evt)) {
            updateStyle((JDesktopPane)evt.getSource());
        }
        if (evt.getPropertyName() == "ancestor" && taskBar != null) {
            taskBar.adjustSize();
        }
    }
}