/**
 * ControllerSlider.java
 *
 * ControllerSlider is a class that generates a GUI JSlider, potentially for any Midi
 * controller number, with methods to interrogate it if it is the source of an external
 * ChangeListener. Internally, it looks after itself regarding updating the border
 * title to include the current reading. More public static final ints could be added
 * to make this class very widely applicable.
 *
 * It does not actually send any midi data - this should be done through the external
 * ChangeListener.
 *
 * Methods are:
 *	getValue()	int
 *	getChan()	int
 *	getControllerNum()	int
 *	getControllerName()	String
 *	updateLabel()	void
 *
 * Andy Murray 18/12/02
 */

import java.awt.*;
import java.applet.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.border.*;

class ControllerSlider extends JSlider implements ChangeListener
{
	private int intChan,
				intController,	//MIDI controller number
				intInitialVal,
				intMTS;	//minor tick spacing
	private String strController;
	public static final int MOD_WHEEL = 1,
							VOL = 7,
							PAN = 10,
							REVERB = 75,
							CHORUS = 78;							;

	//constructor
	ControllerSlider(int chan, int TYPE, boolean showTicks)
	{
		super(JSlider.HORIZONTAL,0,128,0);//final tick not drawn if 127 used!
		intController=TYPE;
		switch (TYPE)
		{
			case MOD_WHEEL : strController="Mod"; intInitialVal=0; intMTS=1; break;
			case VOL : strController="Vol"; intInitialVal=100; intMTS=8; break;
			case PAN : strController="Pan"; intInitialVal=64; intMTS=8; break;
			case REVERB : strController="Rvb"; intInitialVal=40; intMTS=1; break;
			case CHORUS : strController="Chorus"; intInitialVal=0; intMTS=1; break;
		}
		setValue(intInitialVal);
		intChan = chan;
		setMajorTickSpacing(64);
		setMinorTickSpacing(intMTS);
		setPaintTicks(showTicks);
		TitledBorder tb = new TitledBorder(new EtchedBorder(),strController+" = "+intInitialVal);
		setBorder(tb);
		setBackground(Color.lightGray);
		addChangeListener(this);
	}

	/**
	 * Internal listener to update title border reading
	 */
	public void stateChanged(ChangeEvent ce)
	{
		updateLabel();
	}

	/**
	 * Can also be called externally to make title reflect current value
	 */
	public void updateLabel()
	{
		int val = getValue();
		TitledBorder tb = (TitledBorder)getBorder();
		String title = tb.getTitle();
		tb.setTitle(title.substring(0,title.indexOf('=')+2) + val);
		repaint();
	}

	/**
	 * Returns slider value
	 */
	public int getValue()
	{
		int val=super.getValue();
		if (val>127) {val=127;}	//correct for possible 128 value
		return val;
	}

	/**
	 * Returns slider channel
	 */
	public int getChan()
	{
		return intChan;
	}

	/**
	 * Returns controller number to be altered
	 */
	public int getControllerNum()
	{
		return intController;
	}

	/**
	 * Returns abbreviated name (description) of controller
	 */
	public String getControllerName()
	{
		return strController;
	}

}