/* 
 * File JavaExamples/Caviness/ScrollTest_1_1.java
 * Copyright BF Caviness
 * 04 November 1997 Version 1.0
 * 25 Nov 1998 changes by E Kaltofen: Java 1.1 event model
 */


/**
 * This example demonstrates the use of the JDK component Scrollbar
 * and further methods for TextField components.  It uses three scroll
 * bars in addition to three TextFields to specify the red, green,
 * and blue components of a  color to be displayed.  The text fields
 * and the scroll bars interact with each other.  For example, when the
 * red scoll bar is changed, it changes the value of the red text field
 * as well as the color.  When the red text field is changed, the 
 * corresponding change is made in the setting of the red scroll bar.
 * The green and blue textfield/scrollbar pairs work in an analogous 
 * fashion.
 */

import java.awt.*;
import java.awt.event.*;

public class ScrollTest_1_1C extends Frame{
// EK: has two Panels (tfp, sbp) and a Canvas (palette)
//     tfp (textfieldpanel) has three TextFields
//     sbp (scrollbarpanel) has three Scrollbars (which are painted in
//                          an Panel holding the Label and the Scrollbar)
//                          and layed out vertically

    private TextField redTF;	// Text field variables
    private TextField greenTF;
    private TextField blueTF;

    private Scrollbar redSB;	// Scroll bar variables
    private Scrollbar greenSB;
    private Scrollbar blueSB;

    private ColorCanvas palette;// Canvas for color palette; EK:local class def'd below
    
    public ScrollTest_1_1C( String title ){
        super( title );				// Set frame title

        Panel tfp = new Panel();		// A panel to hold the TextFields
        redTF = addTextField( tfp,"Red" );	// EK: ScrollTest_1_1.addTextfield
        redTF.addActionListener(new ActionListener () {
           public void actionPerformed(ActionEvent e) {
                 System.out.println("Textfield.actionPerformed() w e " + e );
                 int col = Integer.parseInt(redTF.getText());
                 redSB.setValue(col);
                 palette.setColor();
              } });

        greenTF = addTextField( tfp,"Green" );
        greenTF.addActionListener(new ActionListener () {
           public void actionPerformed(ActionEvent e) {
                 System.out.println("Textfield.actionPerformed() w e " + e );
                 int col = Integer.parseInt(greenTF.getText());
                 greenSB.setValue(col);
                 palette.setColor();
              } });

        blueTF = addTextField( tfp,"Blue" );
        blueTF.addActionListener(new ActionListener () {
           public void actionPerformed(ActionEvent e) {
                 System.out.println("Textfield.actionPerformed() w e " + e );
                 int col = Integer.parseInt(blueTF.getText());
                 blueSB.setValue(col);
                 palette.setColor();
              } });

        Panel sbp = new Panel();		// A panel to hold the Scrollbars
        sbp.setLayout( new BorderLayout() );	// EK: Container.setLayout
        redSB = addScrollbar( sbp,"Red","North" ); // EK: ScrollTest_1_1.addScrollbar
        redSB.addAdjustmentListener(new AdjustmentListener () {
           public void adjustmentValueChanged(AdjustmentEvent e) {
                System.out.println("Scrollbar.adjustmentValueChanged() w e " + e );
                int col = e.getValue();               
                redTF.setText( "" + col );
                palette.setColor();
             } } );

        greenSB = addScrollbar( sbp,"Green","Center" );
        greenSB.addAdjustmentListener(new AdjustmentListener () {
           public void adjustmentValueChanged(AdjustmentEvent e) {
                System.out.println("Scrollbar.adjustmentValueChanged() w e " + e );
                int col = e.getValue();               
                greenTF.setText( "" + col );
                palette.setColor();
             } } );

        blueSB = addScrollbar( sbp,"Blue","South" );
        blueSB.addAdjustmentListener(new AdjustmentListener () {
           public void adjustmentValueChanged(AdjustmentEvent e) {
                System.out.println("Scrollbar.adjustmentValueChanged() w e " + e );
                int col = e.getValue();               
                blueTF.setText( "" + col );
                palette.setColor();
             } } );

        setLayout( new BorderLayout() );	// Layout frame
        setSize( 600,300 );                     // EK: Component.setSize
        add( tfp,"North" );			// Add text fields
                                                // EK: Container.add(Component,Object)
        palette = new ColorCanvas();           
        add( palette,"Center" );
        add( sbp,"South" );			// Add scroll bars

        this.addWindowListener(new WindowAdapter() {
         public void windowClosing(WindowEvent e) {
           System.out.println("ScrollTest.windowClosing() w e " + e );
           dispose(); System.exit(0);
         } } );

    }// end ScrollTest_1_1(String)


    /**
     * Two auxilary functions used by the constructor
     */
    public TextField addTextField( Panel p, String label ){
        p.add( new Label( label ) );
        TextField t = new TextField( "255" );
        p.add( t ); // EK: Container.add(...)
        return t;
    }

    public Scrollbar addScrollbar( Panel p, String label, String here ){
        Scrollbar b = new Scrollbar( Scrollbar.HORIZONTAL,0,0,0,255 );
                              // EK: orientation,init,visible,min,max
        b.setValue( 255 );		// Set initial value; EK: Scrollbar.setValue
        Panel pair = new Panel();	// Panel to hold each label and
        // pair.add( new Label( label ) );	// scroll bar pair
        p.add( new Label( label ), here );	// scroll bar pair
        // pair.add( b );
        // p.add( pair, here );
        p.add( b, here );
        return b;
    }

    public static void main( String arg[] ){
        Frame f = new ScrollTest_1_1( "Color Mixer" );
        f.show();
    }

class ColorCanvas extends Canvas{

    private Color backGround;
    private int red;
    private int green;
    private int blue;

    public ColorCanvas(){
        setColor( 255,255,255 );
    }

    public void setColor( int r, int g, int b ){
        
        backGround = new Color( r,g,b );
        setBackground( backGround );	// Note that paint() does not need
        // EK: Component.setBackground  // to be redefined as we are only
        repaint();			// changing the bkground color and
    }                                   // repaint() redoes the background.

    public void setColor() {
         setColor(redSB.getValue(), greenSB.getValue(), blueSB.getValue());
    }

}// end class ColorCanvas

}// end class ScrollTest_1_1