/*

 * Copyright (c) 1998, 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.colorchooser;

import javax.swing.*;

import javax.swing.border.*;

import javax.swing.event.*;

import javax.swing.text.*;

import java.awt.*;

import java.awt.image.*;

import java.awt.event.*;

import java.beans.PropertyChangeEvent;

import java.beans.PropertyChangeListener;

import java.io.Serializable;

import sun.swing.SwingUtilities2;

/**

 * The standard preview panel for the color chooser.

 * <p>

 * <strong>Warning:</strong>

 * Serialized objects of this class will not be compatible with

 * future Swing releases. The current serialization support is

 * appropriate for short term storage or RMI between applications running

 * the same version of Swing.  As of 1.4, support for long term storage

 * of all JavaBeans™

 * has been added to the <code>java.beans</code> package.

 * Please see {@link java.beans.XMLEncoder}.

 *

 * @author Steve Wilson

 * @see JColorChooser

 */

class DefaultPreviewPanel extends JPanel {

    private int squareSize = 25;

    private int squareGap = 5;

    private int innerGap = 5;

    private int textGap = 5;

    private Font font = new Font(Font.DIALOG, Font.PLAIN, 12);

    private String sampleText;

    private int swatchWidth = 50;

    private Color oldColor = null;

    private JColorChooser getColorChooser() {

        return (JColorChooser)SwingUtilities.getAncestorOfClass(

                                   JColorChooser.class, this);

    }

    public Dimension getPreferredSize() {

        JComponent host = getColorChooser();

        if (host == null) {

            host = this;

        }

        FontMetrics fm = host.getFontMetrics(getFont());

        int ascent = fm.getAscent();

        int height = fm.getHeight();

        int width = SwingUtilities2.stringWidth(host, fm, getSampleText());

        int y = height*3 + textGap*3;

        int x = squareSize * 3 + squareGap*2 + swatchWidth + width + textGap*3;

        return new Dimension( x,y );

    }

    public void paintComponent(Graphics g) {

        if (oldColor == null)

            oldColor = getForeground();

        g.setColor(getBackground());

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

        if (this.getComponentOrientation().isLeftToRight()) {

            int squareWidth = paintSquares(g, 0);

            int textWidth = paintText(g, squareWidth);

            paintSwatch(g, squareWidth + textWidth);

        } else {

            int swatchWidth = paintSwatch(g, 0);

            int textWidth = paintText(g, swatchWidth);

            paintSquares(g , swatchWidth + textWidth);

        }

    }

    private int paintSwatch(Graphics g, int offsetX) {

        int swatchX = offsetX;

        g.setColor(oldColor);

        g.fillRect(swatchX, 0, swatchWidth, (squareSize) + (squareGap/2));

        g.setColor(getForeground());

        g.fillRect(swatchX, (squareSize) + (squareGap/2), swatchWidth, (squareSize) + (squareGap/2) );

        return (swatchX+swatchWidth);

    }

    private int paintText(Graphics g, int offsetX) {

        g.setFont(getFont());

        JComponent host = getColorChooser();

        if (host == null) {

            host = this;

        }

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

        int ascent = fm.getAscent();

        int height = fm.getHeight();

        int width = SwingUtilities2.stringWidth(host, fm, getSampleText());

        int textXOffset = offsetX + textGap;

        Color color = getForeground();

        g.setColor(color);

        SwingUtilities2.drawString(host, g, getSampleText(),textXOffset+(textGap/2),

                                   ascent+2);

        g.fillRect(textXOffset,

                   ( height) + textGap,

                   width + (textGap),

                   height +2);

        g.setColor(Color.black);

        SwingUtilities2.drawString(host, g, getSampleText(),

                     textXOffset+(textGap/2),

                     height+ascent+textGap+2);

        g.setColor(Color.white);

        g.fillRect(textXOffset,

                   ( height + textGap) * 2,

                   width + (textGap),

                   height +2);

        g.setColor(color);

        SwingUtilities2.drawString(host, g, getSampleText(),

                     textXOffset+(textGap/2),

                     ((height+textGap) * 2)+ascent+2);

        return width + textGap*3;

    }

    private int paintSquares(Graphics g, int offsetX) {

        int squareXOffset = offsetX;

        Color color = getForeground();

        g.setColor(Color.white);

        g.fillRect(squareXOffset,0,squareSize,squareSize);

        g.setColor(color);

        g.fillRect(squareXOffset+innerGap,

                   innerGap,

                   squareSize - (innerGap*2),

                   squareSize - (innerGap*2));

        g.setColor(Color.white);

        g.fillRect(squareXOffset+innerGap*2,

                   innerGap*2,

                   squareSize - (innerGap*4),

                   squareSize - (innerGap*4));

        g.setColor(color);

        g.fillRect(squareXOffset,squareSize+squareGap,squareSize,squareSize);

        g.translate(squareSize+squareGap, 0);

        g.setColor(Color.black);

        g.fillRect(squareXOffset,0,squareSize,squareSize);

        g.setColor(color);

        g.fillRect(squareXOffset+innerGap,

                   innerGap,

                   squareSize - (innerGap*2),

                   squareSize - (innerGap*2));

        g.setColor(Color.white);

        g.fillRect(squareXOffset+innerGap*2,

                   innerGap*2,

                   squareSize - (innerGap*4),

                   squareSize - (innerGap*4));

        g.translate(-(squareSize+squareGap), 0);

        g.translate(squareSize+squareGap, squareSize+squareGap);

        g.setColor(Color.white);

        g.fillRect(squareXOffset,0,squareSize,squareSize);

        g.setColor(color);

        g.fillRect(squareXOffset+innerGap,

                   innerGap,

                   squareSize - (innerGap*2),

                   squareSize - (innerGap*2));

        g.translate(-(squareSize+squareGap), -(squareSize+squareGap));

        g.translate((squareSize+squareGap)*2, 0);

        g.setColor(Color.white);

        g.fillRect(squareXOffset,0,squareSize,squareSize);

        g.setColor(color);

        g.fillRect(squareXOffset+innerGap,

                   innerGap,

                   squareSize - (innerGap*2),

                   squareSize - (innerGap*2));

        g.setColor(Color.black);

        g.fillRect(squareXOffset+innerGap*2,

                   innerGap*2,

                   squareSize - (innerGap*4),

                   squareSize - (innerGap*4));

        g.translate(-((squareSize+squareGap)*2), 0);

        g.translate((squareSize+squareGap)*2, (squareSize+squareGap));

        g.setColor(Color.black);

        g.fillRect(squareXOffset,0,squareSize,squareSize);

        g.setColor(color);

        g.fillRect(squareXOffset+innerGap,

                   innerGap,

                   squareSize - (innerGap*2),

                   squareSize - (innerGap*2));

        g.translate(-((squareSize+squareGap)*2), -(squareSize+squareGap));

        return (squareSize*3+squareGap*2);

    }

    private String getSampleText() {

        if (this.sampleText == null) {

            this.sampleText = UIManager.getString("ColorChooser.sampleText", getLocale());

        }

        return this.sampleText;

    }

}