/*
 * [ColorChooser.java]
 *
 * Summary: Simple ColorChooser for AWT use.
 *
 * Copyright: (c) 2005-2017 Roedy Green, Canadian Mind Products, http://mindprod.com
 *
 * Licence: This software may be copied and used freely for any purpose but military.
 *          http://mindprod.com/contact/nonmil.html
 *
 * Requires: JDK 1.8+
 *
 * Created with: JetBrains IntelliJ IDEA IDE http://www.jetbrains.com/idea/
 *
 * Version History:
 *  2.9 2009-01-23 add Kanji digits to font samples
 */
package com.mindprod.fontshowerawt;

import com.mindprod.common18.FontFactory;

import java.awt.Button;
import java.awt.Choice;
import java.awt.Color;
import java.awt.Dialog;
import java.awt.Font;
import java.awt.Frame;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.Label;
import java.awt.TextArea;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

/**
 * Simple ColorChooser for AWT use.
 * <p/>
 * Reusable Dialog. Construct, then call query to trigger a pop-up and modal user
 * interaction. Query will return the new color selected. You can reuse the same ColorChooser Object by calling query
 * again.
 * <p/>
 * Conserves RAM and time by reusing Font and Font peer objects.
 *
 * @author Roedy Green, Canadian Mind Products
 * @version 2.9 2009-01-23 add Kanji digits to font samples
 * @since 2005-08-10
 */
final class ColorChooser extends Dialog
    {
    /**
     * Cancel request to change colour, undoes selection
     */
    private final Button cancel;

    /**
     * OK to select colour
     */
    private final Button ok;

    /**
     * decimal value for blue
     */
    private final Choice blueDecimalChoice;

    /**
     * hex value for blue
     */
    private final Choice blueHexChoice;

    /**
     * decimal value for green
     */
    private final Choice greenDecimalChoice;

    /**
     * hex value for green
     */
    private final Choice greenHexChoice;

    /**
     * hex value for red
     */
    private final Choice redDecimalChoice;

    /**
     * hex value for red
     */
    private final Choice redHexChoice;

    /**
     * label for blue
     */
    private final Label blueLabel;

    /**
     * "decimal"
     */
    private final Label decimalLabel;

    /**
     * label for green
     */
    private final Label greenLabel;

    /**
     * "hex"
     */
    private final Label hexLabel;

    /**
     * label for red
     */
    private final Label redLabel;

    /**
     * colour swatch
     */
    private final TextArea colorSwatch;

    /**
     * dddd
     */
    private final TextField decimalValue;

    /**
     * #hhhh
     */
    private final TextField hexValue;

    /**
     * original color selection before we started meddling
     */
    private Color originalColor;

    /**
     * color the user chose
     */
    private Color selectedColor;

    /**
     * true if choosing foreground colour
     */
    private boolean choosingForeground;

    /**
     * constructor
     *
     * @param owner enclosing frame, unfortuately Applet is a panel, not a Frame. Chase parents to get the Frame.
     */
    public ColorChooser( Frame owner )
        {
        super( owner, "Choose Color", true );
        decimalLabel = new Label( "Decimal", Label.LEFT );
        hexLabel = new Label( "Hex", Label.RIGHT );
        redDecimalChoice = new Choice();
        greenDecimalChoice = new Choice();
        blueDecimalChoice = new Choice();
        for ( int i = 0; i <= 255; i++ )
            {
            String decimal = Integer.toString( i );
            redDecimalChoice.addItem( decimal );
            greenDecimalChoice.addItem( decimal );
            blueDecimalChoice.addItem( decimal );
            }
        ItemListener theDecimalListener = new ItemListener()
            {
            public void itemStateChanged( ItemEvent e )
                {
                int red = redDecimalChoice.getSelectedIndex();
                int green = greenDecimalChoice.getSelectedIndex();
                int blue = blueDecimalChoice.getSelectedIndex();
                selectedColor = new Color( red, green, blue );
                displayColorSwatch();
                }
            };
        redDecimalChoice.addItemListener( theDecimalListener );
        greenDecimalChoice.addItemListener( theDecimalListener );
        blueDecimalChoice.addItemListener( theDecimalListener );
        redLabel = new Label( "Red", Label.CENTER );
        redLabel.setForeground( Color.white );
        redLabel.setBackground( Color.red );
        greenLabel = new Label( "Green", Label.CENTER );
        greenLabel.setForeground( Color.white );
        greenLabel.setBackground( new Color( 0x009900 ) );// darken green a
        // bit
        blueLabel = new Label( "Blue", Label.CENTER );
        blueLabel.setForeground( Color.white );
        blueLabel.setBackground( Color.blue );
        redHexChoice = new Choice();
        greenHexChoice = new Choice();
        blueHexChoice = new Choice();
        for ( int i = 0; i <= 0xff; i++ )
            {
            String hex = Integer.toHexString( i + 0x100 ).substring( 1 );
            redHexChoice.addItem( hex );
            greenHexChoice.addItem( hex );
            blueHexChoice.addItem( hex );
            }
        ItemListener theHexListener = new ItemListener()
            {
            public void itemStateChanged( ItemEvent e )
                {
                int red = redHexChoice.getSelectedIndex();
                int green = greenHexChoice.getSelectedIndex();
                int blue = blueHexChoice.getSelectedIndex();
                selectedColor = new Color( red, green, blue );
                displayColorSwatch();
                }
            };
        redHexChoice.addItemListener( theHexListener );
        greenHexChoice.addItemListener( theHexListener );
        blueHexChoice.addItemListener( theHexListener );
        decimalValue = new TextField( "16777215" );
        decimalValue.setFont( FontFactory.build( "Dialog", Font.PLAIN, 15 ) );
        // no such things as right justify is AWT with TextField.
        hexValue = new TextField( "#ffffff" );
        hexValue.setFont( FontFactory.build( "Dialog", Font.PLAIN, 15 ) );
        colorSwatch =
                new TextArea( "The quick brown fox jumps\n"
                              + "over the lazy dog's back.",
                        2,
                        25,
                        TextArea.SCROLLBARS_NONE
                );
        colorSwatch.setEditable( false );
        ok = new Button( "OK" );
        ok.addActionListener( new ActionListener()
            {
            public void actionPerformed( ActionEvent e )
                {
                // selectedColor has our choice
                ColorChooser.this.dispose();
                }
            } );
        cancel = new Button( "Cancel" );
        cancel.addActionListener( new ActionListener()
            {
            public void actionPerformed( ActionEvent e )
                {
                // backout to what we started with.
                selectedColor = originalColor;
                ColorChooser.this.dispose();
                }
            } );
        this.addWindowListener( new WindowAdapter()
            {
            /**
             * Handle request to close Dialog.
             * @param e event giving details of closing.
             */
            public void windowClosing( WindowEvent e )
                {
                // backout to what we started with.
                selectedColor = originalColor;
                ColorChooser.this.dispose();
                }
            } );
        this.setLayout( new GridBagLayout() );
        // ---0--1-2------3----
        // 0 decimal----- hex 0
        // 1 rd-- red---- rh -1
        // 2 gd-- green-- gh -2
        // 3 bd-- blue--- bh -3
        // 4 ddddd---- #xxxxx-4
        // 5 ---swatch------ -5
        // 6 ok -- -- -cancel-6
        // x y w h wtx wty anchor fill T L B R padx pady
        this.add( decimalLabel,
                new GridBagConstraints( 0,
                        0,
                        1,
                        1,
                        0.0,
                        0.0,
                        GridBagConstraints.WEST,
                        GridBagConstraints.NONE,
                        new Insets( 10, 10, 5, 5 ),
                        0,
                        0 )
        );
        // x y w h wtx wty anchor fill T L B R padx pady
        this.add( hexLabel,
                new GridBagConstraints( 3,
                        0,
                        1,
                        1,
                        0.0,
                        0.0,
                        GridBagConstraints.EAST,
                        GridBagConstraints.NONE,
                        new Insets( 10, 5, 5, 10 ),
                        0,
                        0 )
        );
        // x y w h wtx wty anchor fill T L B R padx pady
        this.add( redDecimalChoice,
                new GridBagConstraints( 0,
                        1,
                        1,
                        1,
                        0.0,
                        0.0,
                        GridBagConstraints.WEST,
                        GridBagConstraints.NONE,
                        new Insets( 5, 10, 5, 5 ),
                        0,
                        0 )
        );
        // x y w h wtx wty anchor fill T L B R padx pady
        this.add( redLabel,
                new GridBagConstraints( 1,
                        1,
                        2,
                        1,
                        0.0,
                        0.0,
                        GridBagConstraints.CENTER,
                        GridBagConstraints.HORIZONTAL,
                        new Insets( 5, 20, 5, 5 ),
                        0,
                        0 )
        );
        // x y w h wtx wty anchor fill T L B R padx pady
        this.add( redHexChoice,
                new GridBagConstraints( 3,
                        1,
                        1,
                        1,
                        0.0,
                        0.0,
                        GridBagConstraints.EAST,
                        GridBagConstraints.NONE,
                        new Insets( 5, 5, 5, 10 ),
                        0,
                        0 )
        );
        // x y w h wtx wty anchor fill T L B R padx pady
        this.add( greenDecimalChoice,
                new GridBagConstraints( 0,
                        2,
                        1,
                        1,
                        0.0,
                        0.0,
                        GridBagConstraints.WEST,
                        GridBagConstraints.NONE,
                        new Insets( 5, 10, 5, 5 ),
                        0,
                        0 )
        );
        // x y w h wtx wty anchor fill T L B R padx pady
        this.add( greenLabel,
                new GridBagConstraints( 1,
                        2,
                        2,
                        1,
                        0.0,
                        0.0,
                        GridBagConstraints.CENTER,
                        GridBagConstraints.HORIZONTAL,
                        new Insets( 5, 20, 5, 5 ),
                        0,
                        0 )
        );
        // x y w h wtx wty anchor fill T L B R padx pady
        this.add( greenHexChoice,
                new GridBagConstraints( 3,
                        2,
                        1,
                        1,
                        0.0,
                        0.0,
                        GridBagConstraints.EAST,
                        GridBagConstraints.NONE,
                        new Insets( 5, 5, 5, 10 ),
                        0,
                        0 )
        );
        // x y w h wtx wty anchor fill T L B R padx pady
        this.add( blueDecimalChoice,
                new GridBagConstraints( 0,
                        3,
                        1,
                        1,
                        0.0,
                        0.0,
                        GridBagConstraints.WEST,
                        GridBagConstraints.NONE,
                        new Insets( 5, 10, 5, 5 ),
                        0,
                        0 )
        );
        // x y w h wtx wty anchor fill T L B R padx pady
        this.add( blueLabel,
                new GridBagConstraints( 1,
                        3,
                        2,
                        1,
                        0.0,
                        0.0,
                        GridBagConstraints.CENTER,
                        GridBagConstraints.HORIZONTAL,
                        new Insets( 5, 20, 5, 5 ),
                        0,
                        0 )
        );
        // x y w h wtx wty anchor fill T L B R padx pady
        this.add( blueHexChoice,
                new GridBagConstraints( 3,
                        3,
                        1,
                        1,
                        0.0,
                        0.0,
                        GridBagConstraints.EAST,
                        GridBagConstraints.NONE,
                        new Insets( 5, 5, 5, 10 ),
                        0,
                        0 )
        );
        // x y w h wtx wty anchor fill T L B R padx pady
        this.add( decimalValue,
                new GridBagConstraints( 0,
                        4,
                        1,
                        1,
                        0.0,
                        0.0,
                        GridBagConstraints.WEST,
                        GridBagConstraints.NONE,
                        new Insets( 5, 10, 5, 5 ),
                        0,
                        0 )
        );
        // x y w h wtx wty anchor fill T L B R padx pady
        this.add( hexValue,
                new GridBagConstraints( 3,
                        4,
                        1,
                        1,
                        0.0,
                        0.0,
                        GridBagConstraints.EAST,
                        GridBagConstraints.NONE,
                        new Insets( 5, 5, 5, 10 ),
                        0,
                        0 )
        );
        // x y w h wtx wty anchor fill T L B R padx pady
        this.add( colorSwatch,
                new GridBagConstraints( 0,
                        5,
                        4,
                        1,
                        50.0,
                        50.0,
                        GridBagConstraints.CENTER,
                        GridBagConstraints.BOTH,
                        new Insets( 5, 10, 5, 10 ),
                        0,
                        0 )
        );
        // x y w h wtx wty anchor fill T L B R padx pady
        this.add( ok,
                new GridBagConstraints( 0,
                        6,
                        2,
                        1,
                        0.0,
                        0.0,
                        GridBagConstraints.WEST,
                        GridBagConstraints.NONE,
                        new Insets( 5, 10, 10, 5 ),
                        0,
                        0 )
        );
        // x y w h wtx wty anchor fill T L B R padx pady
        this.add( cancel,
                new GridBagConstraints( 2,
                        6,
                        2,
                        1,
                        0.0,
                        0.0,
                        GridBagConstraints.EAST,
                        GridBagConstraints.NONE,
                        new Insets( 5, 5, 10, 10 ),
                        0,
                        0 )
        );
        this.pack();
        } // end constructor

    /**
     * change the colour of the display swatch to reflect the recent color change.
     */
    private void displayColorSwatch()
        {
        redDecimalChoice.select( selectedColor.getRed() );
        greenDecimalChoice.select( selectedColor.getGreen() );
        blueDecimalChoice.select( selectedColor.getBlue() );
        redHexChoice.select( selectedColor.getRed() );
        greenHexChoice.select( selectedColor.getGreen() );
        blueHexChoice.select( selectedColor.getBlue() );
        int rgb = selectedColor.getRGB() & 0xffffff;
        decimalValue.setText( Integer.toString( rgb ) );
        // pad with lead zeros as necessary
        hexValue.setText( '#' + Integer.toHexString( rgb + 0x1000000 )
                .substring( 1 ) );
        if ( choosingForeground )
            {
            colorSwatch.setForeground( selectedColor );
            }
        else
            {
            colorSwatch.setBackground( selectedColor );
            }
        this.validate();
        colorSwatch.repaint();
        }

    /**
     * query user which color he wants.
     *
     * @param chooseForeground   true if want to choose the forground colour, false if the background.
     * @param originalBackground background before user changes it.
     * @param originalForeground foreground before user changes it.
     *
     * @return new color selected. Will match original selection if hits CANCEL.
     */
    public Color query( boolean chooseForeground,
                        Color originalBackground,
                        Color originalForeground )
        {
        this.choosingForeground = chooseForeground;
        if ( choosingForeground )
            {
            this.selectedColor = originalForeground;
            this.originalColor = originalForeground;
            setTitle( "Choose Foreground Color" );
            }
        else
            {
            this.selectedColor = originalBackground;
            this.originalColor = originalBackground;
            setTitle( "Choose Background Color" );
            }
        colorSwatch.setForeground( originalForeground );
        colorSwatch.setBackground( originalBackground );
        displayColorSwatch();
        // won't return from setVisible until entire dialog exchange is complete
        // which many consist of many selections before hitting OK or cancel.
        setVisible( true );
        return selectedColor;
        }
    }