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 * 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

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 */

package javax.swing.plaf.synth;

import javax.swing.*;

import javax.swing.plaf.*;

import javax.swing.plaf.basic.*;

import javax.swing.text.View;

import java.awt.Dimension;

import java.awt.Rectangle;

import java.awt.Insets;

import java.awt.Graphics;

import java.awt.FontMetrics;

import java.beans.PropertyChangeEvent;

/**

 * Provides the Synth L&F UI delegate for

 * {@link javax.swing.JLabel}.

 *

 * @author Scott Violet

 * @since 1.7

 */

public class SynthLabelUI extends BasicLabelUI implements SynthUI {

    private SynthStyle style;

    /**

     * Returns the LabelUI implementation used for the skins look and feel.

     *

     * @param c component to create UI object for

     * @return the UI object

     */

    public static ComponentUI createUI(JComponent c){

        return new SynthLabelUI();

    }

    /**

     * {@inheritDoc}

     */

    @Override

    protected void installDefaults(JLabel c) {

        updateStyle(c);

    }

    void updateStyle(JLabel c) {

        SynthContext context = getContext(c, ENABLED);

        style = SynthLookAndFeel.updateStyle(context, this);

        context.dispose();

    }

    /**

     * {@inheritDoc}

     */

    @Override

    protected void uninstallDefaults(JLabel c){

        SynthContext context = getContext(c, ENABLED);

        style.uninstallDefaults(context);

        context.dispose();

        style = null;

    }

    /**

     * {@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) {

        int state = SynthLookAndFeel.getComponentState(c);

        if (SynthLookAndFeel.getSelectedUI() == this &&

                        state == SynthConstants.ENABLED) {

            state = SynthLookAndFeel.getSelectedUIState() | SynthConstants.ENABLED;

        }

        return state;

    }

    /**

     * {@inheritDoc}

     */

    @Override

    public int getBaseline(JComponent c, int width, int height) {

        if (c == null) {

            throw new NullPointerException("Component must be non-null");

        }

        if (width < 0 || height < 0) {

            throw new IllegalArgumentException(

                    "Width and height must be >= 0");

        }

        JLabel label = (JLabel)c;

        String text = label.getText();

        if (text == null || "".equals(text)) {

            return -1;

        }

        Insets i = label.getInsets();

        Rectangle viewRect = new Rectangle();

        Rectangle textRect = new Rectangle();

        Rectangle iconRect = new Rectangle();

        viewRect.x = i.left;

        viewRect.y = i.top;

        viewRect.width = width - (i.right + viewRect.x);

        viewRect.height = height - (i.bottom + viewRect.y);

        // layout the text and icon

        SynthContext context = getContext(label);

        FontMetrics fm = context.getComponent().getFontMetrics(

            context.getStyle().getFont(context));

        context.getStyle().getGraphicsUtils(context).layoutText(

            context, fm, label.getText(), label.getIcon(),

            label.getHorizontalAlignment(), label.getVerticalAlignment(),

            label.getHorizontalTextPosition(), label.getVerticalTextPosition(),

            viewRect, iconRect, textRect, label.getIconTextGap());

        View view = (View)label.getClientProperty(BasicHTML.propertyKey);

        int baseline;

        if (view != null) {

            baseline = BasicHTML.getHTMLBaseline(view, textRect.width,

                                                 textRect.height);

            if (baseline >= 0) {

                baseline += textRect.y;

            }

        }

        else {

            baseline = textRect.y + fm.getAscent();

        }

        context.dispose();

        return baseline;

    }

    /**

     * 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().paintLabelBackground(context,

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

        paint(context, g);

        context.dispose();

    }

    /**

     * 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.

     *

     * @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) {

        JLabel label = (JLabel)context.getComponent();

        Icon icon = (label.isEnabled()) ? label.getIcon() :

                                          label.getDisabledIcon();

        g.setColor(context.getStyle().getColor(context,

                                               ColorType.TEXT_FOREGROUND));

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

        context.getStyle().getGraphicsUtils(context).paintText(

            context, g, label.getText(), icon,

            label.getHorizontalAlignment(), label.getVerticalAlignment(),

            label.getHorizontalTextPosition(), label.getVerticalTextPosition(),

            label.getIconTextGap(), label.getDisplayedMnemonicIndex(), 0);

    }

    /**

     * {@inheritDoc}

     */

    @Override

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

                            int y, int w, int h) {

        context.getPainter().paintLabelBorder(context, g, x, y, w, h);

    }

    /**

     * {@inheritDoc}

     */

    @Override

    public Dimension getPreferredSize(JComponent c) {

        JLabel label = (JLabel)c;

        Icon icon = (label.isEnabled()) ? label.getIcon() :

                                          label.getDisabledIcon();

        SynthContext context = getContext(c);

        Dimension size = context.getStyle().getGraphicsUtils(context).

            getPreferredSize(

               context, context.getStyle().getFont(context), label.getText(),

               icon, label.getHorizontalAlignment(),

               label.getVerticalAlignment(), label.getHorizontalTextPosition(),

               label.getVerticalTextPosition(), label.getIconTextGap(),

               label.getDisplayedMnemonicIndex());

        context.dispose();

        return size;

    }

    /**

     * {@inheritDoc}

     */

    @Override

    public Dimension getMinimumSize(JComponent c) {

        JLabel label = (JLabel)c;

        Icon icon = (label.isEnabled()) ? label.getIcon() :

                                          label.getDisabledIcon();

        SynthContext context = getContext(c);

        Dimension size = context.getStyle().getGraphicsUtils(context).

            getMinimumSize(

               context, context.getStyle().getFont(context), label.getText(),

               icon, label.getHorizontalAlignment(),

               label.getVerticalAlignment(), label.getHorizontalTextPosition(),

               label.getVerticalTextPosition(), label.getIconTextGap(),

               label.getDisplayedMnemonicIndex());

        context.dispose();

        return size;

    }

    /**

     * {@inheritDoc}

     */

    @Override

    public Dimension getMaximumSize(JComponent c) {

        JLabel label = (JLabel)c;

        Icon icon = (label.isEnabled()) ? label.getIcon() :

                                          label.getDisabledIcon();

        SynthContext context = getContext(c);

        Dimension size = context.getStyle().getGraphicsUtils(context).

               getMaximumSize(

               context, context.getStyle().getFont(context), label.getText(),

               icon, label.getHorizontalAlignment(),

               label.getVerticalAlignment(), label.getHorizontalTextPosition(),

               label.getVerticalTextPosition(), label.getIconTextGap(),

               label.getDisplayedMnemonicIndex());

        context.dispose();

        return size;

    }

    /**

     * {@inheritDoc}

     */

    @Override

    public void propertyChange(PropertyChangeEvent e) {

        super.propertyChange(e);

        if (SynthLookAndFeel.shouldUpdateStyle(e)) {

            updateStyle((JLabel)e.getSource());

        }

    }

}