/*
 * Copyright (c) 2002, 2013, 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.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Insets;
import java.awt.LayoutManager;
import java.awt.Rectangle;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import javax.swing.Box;
import javax.swing.Icon;
import javax.swing.JComponent;
import javax.swing.JSeparator;
import javax.swing.JToolBar;
import javax.swing.plaf.ComponentUI;
import javax.swing.plaf.basic.BasicToolBarUI;

Provides the Synth L&F UI delegate for JToolBar. 
Since:
1.7/**
 * Provides the Synth L&F UI delegate for
 * {@link javax.swing.JToolBar}.
 *
 * @since 1.7
 */
public class SynthToolBarUI extends BasicToolBarUI
                            implements PropertyChangeListener, SynthUI {
    private Icon handleIcon = null;
    private Rectangle contentRect = new Rectangle();

    private SynthStyle style;
    private SynthStyle contentStyle;
    private SynthStyle dragWindowStyle;

    
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 SynthToolBarUI();
    }

    
{@inheritDoc}
/**
     * {@inheritDoc}
     */
    @Override
    protected void installDefaults() {
        toolBar.setLayout(createLayout());
        updateStyle(toolBar);
    }

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

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

    private void updateStyle(JToolBar c) {
        SynthContext context = getContext(
                c, Region.TOOL_BAR_CONTENT, null, ENABLED);
        contentStyle = SynthLookAndFeel.updateStyle(context, this);

        context = getContext(c, Region.TOOL_BAR_DRAG_WINDOW, null, ENABLED);
        dragWindowStyle = SynthLookAndFeel.updateStyle(context, this);

        context = getContext(c, ENABLED);
        SynthStyle oldStyle = style;

        style = SynthLookAndFeel.updateStyle(context, this);
        if (oldStyle != style) {
            handleIcon =
                style.getIcon(context, "ToolBar.handleIcon");
            if (oldStyle != null) {
                uninstallKeyboardActions();
                installKeyboardActions();
            }
        }
    }

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

        style.uninstallDefaults(context);
        style = null;

        handleIcon = null;

        context = getContext(toolBar, Region.TOOL_BAR_CONTENT,
                             contentStyle, ENABLED);
        contentStyle.uninstallDefaults(context);
        contentStyle = null;

        context = getContext(toolBar, Region.TOOL_BAR_DRAG_WINDOW,
                             dragWindowStyle, ENABLED);
        dragWindowStyle.uninstallDefaults(context);
        dragWindowStyle = null;

        toolBar.setLayout(null);
    }

    
{@inheritDoc}
/**
     * {@inheritDoc}
     */
    @Override
    protected void installComponents() {}

    
{@inheritDoc}
/**
     * {@inheritDoc}
     */
    @Override
    protected void uninstallComponents() {}

    
Creates a LayoutManager to use with the toolbar. 
Returns:
a LayoutManager instance/**
     * Creates a {@code LayoutManager} to use with the toolbar.
     *
     * @return a {@code LayoutManager} instance
     */
    protected LayoutManager createLayout() {
        return new SynthToolBarLayoutManager();
    }

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

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

    private SynthContext getContext(JComponent c, Region region, SynthStyle style) {
        return SynthContext.getContext(c, region,
                                       style, getComponentState(c, region));
    }

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

    private int getComponentState(JComponent c, Region region) {
        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().paintToolBarBackground(context,
                          g, 0, 0, c.getWidth(), c.getHeight(),
                          toolBar.getOrientation());
        paint(context, g);
    }

    
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);
    }

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

    
This implementation does nothing, because the rollover property of the JToolBar class is not used in the Synth Look and Feel. /**
     * This implementation does nothing, because the {@code rollover}
     * property of the {@code JToolBar} class is not used
     * in the Synth Look and Feel.
     */
    @Override
    protected void setBorderToNonRollover(Component c) {}

    
This implementation does nothing, because the rollover property of the JToolBar class is not used in the Synth Look and Feel. /**
     * This implementation does nothing, because the {@code rollover}
     * property of the {@code JToolBar} class is not used
     * in the Synth Look and Feel.
     */
    @Override
    protected void setBorderToRollover(Component c) {}

    
This implementation does nothing, because the rollover property of the JToolBar class is not used in the Synth Look and Feel. /**
     * This implementation does nothing, because the {@code rollover}
     * property of the {@code JToolBar} class is not used
     * in the Synth Look and Feel.
     */
    @Override
    protected void setBorderToNormal(Component c) {}

    
Paints the toolbar.
Params:
context – context for the component being painted
g – the Graphics object used for painting
See Also:
update(Graphics, JComponent)/**
     * Paints the toolbar.
     *
     * @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) {
        if (handleIcon != null && toolBar.isFloatable()) {
            int startX = toolBar.getComponentOrientation().isLeftToRight() ?
                0 : toolBar.getWidth() -
                    SynthGraphicsUtils.getIconWidth(handleIcon, context);
            SynthGraphicsUtils.paintIcon(handleIcon, context, g, startX, 0,
                    SynthGraphicsUtils.getIconWidth(handleIcon, context),
                    SynthGraphicsUtils.getIconHeight(handleIcon, context));
        }

        SynthContext subcontext = getContext(
                toolBar, Region.TOOL_BAR_CONTENT, contentStyle);
        paintContent(subcontext, g, contentRect);
    }

    
Paints the toolbar content.
Params:
context – context for the component being painted
g – Graphics object used for painting
bounds – bounding box for the toolbar/**
     * Paints the toolbar content.
     *
     * @param context context for the component being painted
     * @param g {@code Graphics} object used for painting
     * @param bounds bounding box for the toolbar
     */
    protected void paintContent(SynthContext context, Graphics g,
            Rectangle bounds) {
        SynthLookAndFeel.updateSubregion(context, g, bounds);
        context.getPainter().paintToolBarContentBackground(context, g,
                             bounds.x, bounds.y, bounds.width, bounds.height,
                             toolBar.getOrientation());
        context.getPainter().paintToolBarContentBorder(context, g,
                             bounds.x, bounds.y, bounds.width, bounds.height,
                             toolBar.getOrientation());
    }

    
{@inheritDoc}
/**
     * {@inheritDoc}
     */
    @Override
    protected void paintDragWindow(Graphics g) {
        int w = dragWindow.getWidth();
        int h = dragWindow.getHeight();
        SynthContext context = getContext(
                toolBar, Region.TOOL_BAR_DRAG_WINDOW, dragWindowStyle);
        SynthLookAndFeel.updateSubregion(
                context, g, new Rectangle(0, 0, w, h));
        context.getPainter().paintToolBarDragWindowBackground(context,
                                                           g, 0, 0, w, h,
                                                           dragWindow.getOrientation());
        context.getPainter().paintToolBarDragWindowBorder(context, g, 0, 0, w, h,
                                                          dragWindow.getOrientation());
    }

    //
    // PropertyChangeListener
    //

    
{@inheritDoc}
/**
     * {@inheritDoc}
     */
    @Override
    public void propertyChange(PropertyChangeEvent e) {
        if (SynthLookAndFeel.shouldUpdateStyle(e)) {
            updateStyle((JToolBar)e.getSource());
        }
    }


    class SynthToolBarLayoutManager implements LayoutManager {
        public void addLayoutComponent(String name, Component comp) {}

        public void removeLayoutComponent(Component comp) {}

        public Dimension minimumLayoutSize(Container parent) {
            JToolBar tb = (JToolBar)parent;
            Insets insets = tb.getInsets();
            Dimension dim = new Dimension();
            SynthContext context = getContext(tb);

            if (tb.getOrientation() == JToolBar.HORIZONTAL) {
                dim.width = tb.isFloatable() ?
                    SynthGraphicsUtils.getIconWidth(handleIcon, context) : 0;
                Dimension compDim;
                for (int i = 0; i < tb.getComponentCount(); i++) {
                    Component component = tb.getComponent(i);
                    if (component.isVisible()) {
                        compDim = component.getMinimumSize();
                        dim.width += compDim.width;
                        dim.height = Math.max(dim.height, compDim.height);
                    }
                }
            } else {
                dim.height = tb.isFloatable() ?
                    SynthGraphicsUtils.getIconHeight(handleIcon, context) : 0;
                Dimension compDim;
                for (int i = 0; i < tb.getComponentCount(); i++) {
                    Component component = tb.getComponent(i);
                    if (component.isVisible()) {
                        compDim = component.getMinimumSize();
                        dim.width = Math.max(dim.width, compDim.width);
                        dim.height += compDim.height;
                    }
                }
            }
            dim.width += insets.left + insets.right;
            dim.height += insets.top + insets.bottom;

            return dim;
        }

        public Dimension preferredLayoutSize(Container parent) {
            JToolBar tb = (JToolBar)parent;
            Insets insets = tb.getInsets();
            Dimension dim = new Dimension();
            SynthContext context = getContext(tb);

            if (tb.getOrientation() == JToolBar.HORIZONTAL) {
                dim.width = tb.isFloatable() ?
                    SynthGraphicsUtils.getIconWidth(handleIcon, context) : 0;
                Dimension compDim;
                for (int i = 0; i < tb.getComponentCount(); i++) {
                    Component component = tb.getComponent(i);
                    if (component.isVisible()) {
                        compDim = component.getPreferredSize();
                        dim.width += compDim.width;
                        dim.height = Math.max(dim.height, compDim.height);
                    }
                }
            } else {
                dim.height = tb.isFloatable() ?
                    SynthGraphicsUtils.getIconHeight(handleIcon, context) : 0;
                Dimension compDim;
                for (int i = 0; i < tb.getComponentCount(); i++) {
                    Component component = tb.getComponent(i);
                    if (component.isVisible()) {
                        compDim = component.getPreferredSize();
                        dim.width = Math.max(dim.width, compDim.width);
                        dim.height += compDim.height;
                    }
                }
            }
            dim.width += insets.left + insets.right;
            dim.height += insets.top + insets.bottom;

            return dim;
        }

        public void layoutContainer(Container parent) {
            JToolBar tb = (JToolBar)parent;
            Insets insets = tb.getInsets();
            boolean ltr = tb.getComponentOrientation().isLeftToRight();
            SynthContext context = getContext(tb);

            Component c;
            Dimension d;

            // JToolBar by default uses a somewhat modified BoxLayout as
            // its layout manager. For compatibility reasons, we want to
            // support Box "glue" as a way to move things around on the
            // toolbar. "glue" is represented in BoxLayout as a Box.Filler
            // with a minimum and preferred size of (0,0).
            // So what we do here is find the number of such glue fillers
            // and figure out how much space should be allocated to them.
            int glueCount = 0;
            for (int i=0; i<tb.getComponentCount(); i++) {
                if (isGlue(tb.getComponent(i))) glueCount++;
            }

            if (tb.getOrientation() == JToolBar.HORIZONTAL) {
                int handleWidth = tb.isFloatable() ?
                    SynthGraphicsUtils.getIconWidth(handleIcon, context) : 0;

                // Note: contentRect does not take insets into account
                // since it is used for determining the bounds that are
                // passed to paintToolBarContentBackground().
                contentRect.x = ltr ? handleWidth : 0;
                contentRect.y = 0;
                contentRect.width = tb.getWidth() - handleWidth;
                contentRect.height = tb.getHeight();

                // However, we do take the insets into account here for
                // the purposes of laying out the toolbar child components.
                int x = ltr ?
                    handleWidth + insets.left :
                    tb.getWidth() - handleWidth - insets.right;
                int baseY = insets.top;
                int baseH = tb.getHeight() - insets.top - insets.bottom;

                // we need to get the minimum width for laying things out
                // so that we can calculate how much empty space needs to
                // be distributed among the "glue", if any
                int extraSpacePerGlue = 0;
                if (glueCount > 0) {
                    int minWidth = preferredLayoutSize(parent).width;
                    extraSpacePerGlue = (tb.getWidth() - minWidth) / glueCount;
                    if (extraSpacePerGlue < 0) extraSpacePerGlue = 0;
                }

                for (int i = 0; i < tb.getComponentCount(); i++) {
                    c = tb.getComponent(i);
                    if (c.isVisible()) {
                        d = c.getPreferredSize();
                        int y, h;
                        if (d.height >= baseH || c instanceof JSeparator) {
                            // Fill available height
                            y = baseY;
                            h = baseH;
                        } else {
                            // Center component vertically in the available space
                            y = baseY + (baseH / 2) - (d.height / 2);
                            h = d.height;
                        }
                        //if the component is a "glue" component then add to its
                        //width the extraSpacePerGlue it is due
                        if (isGlue(c)) d.width += extraSpacePerGlue;
                        c.setBounds(ltr ? x : x - d.width, y, d.width, h);
                        x = ltr ? x + d.width : x - d.width;
                    }
                }
            } else {
                int handleHeight = tb.isFloatable() ?
                    SynthGraphicsUtils.getIconHeight(handleIcon, context) : 0;

                // See notes above regarding the use of insets
                contentRect.x = 0;
                contentRect.y = handleHeight;
                contentRect.width = tb.getWidth();
                contentRect.height = tb.getHeight() - handleHeight;

                int baseX = insets.left;
                int baseW = tb.getWidth() - insets.left - insets.right;
                int y = handleHeight + insets.top;

                // we need to get the minimum height for laying things out
                // so that we can calculate how much empty space needs to
                // be distributed among the "glue", if any
                int extraSpacePerGlue = 0;
                if (glueCount > 0) {
                    int minHeight = minimumLayoutSize(parent).height;
                    extraSpacePerGlue = (tb.getHeight() - minHeight) / glueCount;
                    if (extraSpacePerGlue < 0) extraSpacePerGlue = 0;
                }

                for (int i = 0; i < tb.getComponentCount(); i++) {
                    c = tb.getComponent(i);
                    if (c.isVisible()) {
                        d = c.getPreferredSize();
                        int x, w;
                        if (d.width >= baseW || c instanceof JSeparator) {
                            // Fill available width
                            x = baseX;
                            w = baseW;
                        } else {
                            // Center component horizontally in the available space
                            x = baseX + (baseW / 2) - (d.width / 2);
                            w = d.width;
                        }
                        //if the component is a "glue" component then add to its
                        //height the extraSpacePerGlue it is due
                        if (isGlue(c)) d.height += extraSpacePerGlue;
                        c.setBounds(x, y, w, d.height);
                        y += d.height;
                    }
                }
            }
        }

        private boolean isGlue(Component c) {
            if (c.isVisible() && c instanceof Box.Filler) {
                Box.Filler f = (Box.Filler)c;
                Dimension min = f.getMinimumSize();
                Dimension pref = f.getPreferredSize();
                return min.width == 0 &&  min.height == 0 &&
                        pref.width == 0 && pref.height == 0;
            }
            return false;
        }
    }
}