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package javax.swing.plaf.synth;

import java.awt.*;
import java.beans.*;
import javax.swing.*;
import javax.swing.plaf.*;
import javax.swing.plaf.basic.*;
import sun.swing.MenuItemLayoutHelper;

Provides the Synth L&F UI delegate for JMenu. 
Author:
Georges Saab, David Karlton, Arnaud Weber
Since:
1.7/**
 * Provides the Synth L&F UI delegate for
 * {@link javax.swing.JMenu}.
 *
 * @author Georges Saab
 * @author David Karlton
 * @author Arnaud Weber
 * @since 1.7
 */
public class SynthMenuUI extends BasicMenuUI
                         implements PropertyChangeListener, SynthUI {
    private SynthStyle style;
    private SynthStyle accStyle;

    
Creates a new UI object for the given component.
Params:
x – component to create UI object for
Returns:
the UI object/**
     * 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 SynthMenuUI();
    }

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

    
{@inheritDoc}
/**
     * {@inheritDoc}
     */
    @Override
    protected void installListeners() {
        super.installListeners();
        menuItem.addPropertyChangeListener(this);
    }

    private void updateStyle(JMenuItem mi) {
        SynthStyle oldStyle = style;
        SynthContext context = getContext(mi, ENABLED);

        style = SynthLookAndFeel.updateStyle(context, this);
        if (oldStyle != style) {
            String prefix = getPropertyPrefix();
            defaultTextIconGap = style.getInt(
                           context, prefix + ".textIconGap", 4);
            if (menuItem.getMargin() == null ||
                         (menuItem.getMargin() instanceof UIResource)) {
                Insets insets = (Insets)style.get(context, prefix + ".margin");

                if (insets == null) {
                    // Some places assume margins are non-null.
                    insets = SynthLookAndFeel.EMPTY_UIRESOURCE_INSETS;
                }
                menuItem.setMargin(insets);
            }
            acceleratorDelimiter = style.getString(context, prefix +
                                            ".acceleratorDelimiter", "+");

            if (MenuItemLayoutHelper.useCheckAndArrow(menuItem)) {
                checkIcon = style.getIcon(context, prefix + ".checkIcon");
                arrowIcon = style.getIcon(context, prefix + ".arrowIcon");
            } else {
                // Not needed in this case
                checkIcon = null;
                arrowIcon = null;
            }

            ((JMenu)menuItem).setDelay(style.getInt(context, prefix +
                                                    ".delay", 200));
            if (oldStyle != null) {
                uninstallKeyboardActions();
                installKeyboardActions();
            }
        }
        context.dispose();

        SynthContext accContext = getContext(mi, Region.MENU_ITEM_ACCELERATOR,
                                             ENABLED);

        accStyle = SynthLookAndFeel.updateStyle(accContext, this);
        accContext.dispose();
    }

    
{@inheritDoc}
/**
     * {@inheritDoc}
     */
    @Override
    public void uninstallUI(JComponent c) {
        super.uninstallUI(c);
        // Remove values from the parent's Client Properties.
        JComponent p = MenuItemLayoutHelper.getMenuItemParent((JMenuItem) c);
        if (p != null) {
            p.putClientProperty(
                    SynthMenuItemLayoutHelper.MAX_ACC_OR_ARROW_WIDTH, null);
        }
    }

    
{@inheritDoc}
/**
     * {@inheritDoc}
     */
    @Override
    protected void uninstallDefaults() {
        SynthContext context = getContext(menuItem, ENABLED);
        style.uninstallDefaults(context);
        context.dispose();
        style = null;

        SynthContext accContext = getContext(menuItem,
                                     Region.MENU_ITEM_ACCELERATOR, ENABLED);
        accStyle.uninstallDefaults(accContext);
        accContext.dispose();
        accStyle = null;

        super.uninstallDefaults();
    }

    
{@inheritDoc}
/**
     * {@inheritDoc}
     */
    @Override
    protected void uninstallListeners() {
        super.uninstallListeners();
        menuItem.removePropertyChangeListener(this);
    }

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

    SynthContext getContext(JComponent c, int state) {
        return SynthContext.getContext(c, style, state);
    }

    SynthContext getContext(JComponent c, Region region) {
        return getContext(c, region, getComponentState(c, region));
    }

    private SynthContext getContext(JComponent c, Region region, int state) {
        return SynthContext.getContext(c, region, accStyle, state);
    }

    private int getComponentState(JComponent c) {
        int state;

        if (!c.isEnabled()) {
            return DISABLED;
        }
        if (menuItem.isArmed()) {
            state = MOUSE_OVER;
        }
        else {
            state = SynthLookAndFeel.getComponentState(c);
        }
        if (menuItem.isSelected()) {
            state |= SELECTED;
        }
        return state;
    }

    private int getComponentState(JComponent c, Region region) {
        return getComponentState(c);
    }

    
{@inheritDoc}
/**
     * {@inheritDoc}
     */
    @Override
    protected Dimension getPreferredMenuItemSize(JComponent c,
                                                     Icon checkIcon,
                                                     Icon arrowIcon,
                                                     int defaultTextIconGap) {
        SynthContext context = getContext(c);
        SynthContext accContext = getContext(c, Region.MENU_ITEM_ACCELERATOR);
        Dimension value = SynthGraphicsUtils.getPreferredMenuItemSize(
                context, accContext, c, checkIcon, arrowIcon,
                defaultTextIconGap, acceleratorDelimiter,
                MenuItemLayoutHelper.useCheckAndArrow(menuItem),
                getPropertyPrefix());
        context.dispose();
        accContext.dispose();
        return value;
    }

    
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().paintMenuBackground(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) {
        SynthContext accContext = getContext(menuItem,
                                             Region.MENU_ITEM_ACCELERATOR);
        // Refetch the appropriate check indicator for the current state
        String prefix = getPropertyPrefix();
        Icon checkIcon = style.getIcon(context, prefix + ".checkIcon");
        Icon arrowIcon = style.getIcon(context, prefix + ".arrowIcon");
        SynthGraphicsUtils.paint(context, accContext, g, checkIcon, arrowIcon,
              acceleratorDelimiter, defaultTextIconGap, getPropertyPrefix());
        accContext.dispose();
    }

    
{@inheritDoc}
/**
     * {@inheritDoc}
     */
    @Override
    public void paintBorder(SynthContext context, Graphics g, int x,
                            int y, int w, int h) {
        context.getPainter().paintMenuBorder(context, g, x, y, w, h);
    }

    
{@inheritDoc}
/**
     * {@inheritDoc}
     */
    @Override
    public void propertyChange(PropertyChangeEvent e) {
        if (SynthLookAndFeel.shouldUpdateStyle(e) ||
                (e.getPropertyName().equals("ancestor") && UIManager.getBoolean("Menu.useMenuBarForTopLevelMenus"))) {
            updateStyle((JMenu)e.getSource());
        }
    }
}