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/*
 * @(#)MidiParameterControlKnob.java    beta8   2006/04/23
 *
 * Copyright (C) 2008    Adam King (adamjking@optusnet.com.au)
 *
 * This application is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This application 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 for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this application; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */


package org.midibox.midi.gui;

import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.event.MouseWheelEvent;
import java.awt.event.MouseWheelListener;
import java.util.Observable;

import javax.swing.JPanel;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

import org.midibox.midi.MidiParameterControl;
import org.midibox.utils.gui.Knob;

public class MidiParameterControlKnob extends MidiParameterControlGUI implements
        ChangeListener, MouseWheelListener {

    public static float mouseWheelResolution = 10.0f;

    private Knob knob;

    public MidiParameterControlKnob(MidiParameterControl midiParameter,
            Knob knob, boolean showLabel, String labelLocation,
            boolean valueBelow, boolean showValue) {
        super(midiParameter, showLabel, labelLocation, valueBelow, showValue);
        this.knob = knob;
        JPanel panel = new JPanel(new FlowLayout(FlowLayout.CENTER, 0, 0));
        panel.setOpaque(false);
        panel.add(knob);

        knob.setMinValue(midiParameter.getMidiMinValue());
        knob.setMaxValue(midiParameter.getMidiMaxValue());

        add(panel, BorderLayout.CENTER);
        knob.addChangeListener(this);
        knob.addMouseListener(this);
        knob.addMouseWheelListener(this);
        updateGraphics();
    }

    public void mouseWheelMoved(MouseWheelEvent mwe) {
        knob
                .setValue((int) (knob.getValue() - (mwe.getWheelRotation() * ((mouseWheelResolution / 100) * (knob
                        .getMaxValue() - knob.getMinValue())))));
    }

    public void stateChanged(ChangeEvent ce) {
        if (update) {
            update = false;

            int newval = (int) ((knob.getValue() / knob.getMaxValue()) * (midiParameter
                    .getMidiMaxValue() - midiParameter.getMidiMinValue()))
                    + midiParameter.getMidiMinValue();

            midiParameter.setMidiValue(newval, true);
            update = true;
        }
    }

    public void updateGraphics() {
        super.updateGraphics();
        if (update) {
            update = false;

            float val = (((float) midiParameter.getMidiValue() - (float) midiParameter
                    .getMidiMinValue()) / ((float) midiParameter
                    .getMidiMaxValue() - (float) midiParameter
                    .getMidiMinValue()));

            knob
                    .setValue((int) (val * (knob.getMaxValue() - knob
                            .getMinValue())));

            update = true;
        }
    }

    public void update(Observable observable, Object object) {
        super.update(observable, object);
        if (object == midiParameter.HIGH_RESOLUTION) {

            knob.setMinValue(midiParameter.getMidiMinValue());
            knob.setMaxValue(midiParameter.getMidiMaxValue());
        }
    }
}