//Scroller
//A scrollbar that returns 0 to 255
//Or a float zero to 1
//used in ColorChooser.java
//Andy Harris, 05/00

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

/**
   The Scroller class is a custom scrollbar
   Intended to make color selection panels easier to creat
   It includes methods for RGB and HSB - style color selection
*/
public class Scroller extends Panel implements AdjustmentListener{

  /**  Used to specify an RGB - style scrollbar */
  public static final int RGB = 0;
  /**  Used to specify an RGB - style scrollbar */
  public static final int HSB = 1;

  private int privateType = RGB;

  Scrollbar scr = new Scrollbar(Scrollbar.VERTICAL, 0, 1, 0, 256);
  Label lblValue = new Label("0");
  Label lblCaption = new Label();
  AdjustmentListener listener;
  
  /** type is the type of scrollbar to generate.  Use
      Scroller.RGB to get a 0-255 value, and Scroller.HSB
      to get a 0-1 float value
  */
  public Scroller(int type, String caption){
    privateType = type;
    if (privateType == RGB){
      scr.setMaximum(256);
    } else {
      scr.setMaximum(101);
    } // end if

    setLayout(new BorderLayout());
    add (scr, BorderLayout.CENTER);
    add (lblCaption, BorderLayout.NORTH);
    add (lblValue, BorderLayout.SOUTH);

    setFont(new Font("Serif", Font.PLAIN, 10));
    lblCaption.setText(caption);
    scr.addAdjustmentListener(this);
  } // end constructor

  public void addAdjustmentListener(AdjustmentListener l){
    listener = l;
  } // end addAdjustmentListener

  public void adjustmentValueChanged(AdjustmentEvent e){
    lblValue.setText(String.valueOf(e.getValue()));
    listener.adjustmentValueChanged(e);
  } //end adjustmentValueChanged

  /** returns back an int between 0 and 255 useful for RGB color creation */
  public int getRGBValue(){
      return scr.getValue();
  } // end getIntValue
  
  /** returns back a float between 0 and 1 useful for HSB color creation */
  public float getHSBValue(){
      return (float)((float)scr.getValue() / 100);
  } // end getFloatValue  

  /** set the value of the scrollbar.  MUST be an int value */
  public void setValue(int val){
    scr.setValue(val);
    lblValue.setText(String.valueOf(val));
  } // end setValue

  /** set the value of the scrollbar.  If a float was sent (like an HSB value)
      multiply the value by 100, then set the value
  */
  public void setValue(float fval){
    int val = (int)(fval * 100);
    scr.setValue(val);
    lblValue.setText(String.valueOf(val));
  } // end setValue
  
} // end class def