/*
 * Scroller.java
 */

import java.awt.*;

/* Scroller Object */
public class Scroller extends Panel3D {
    int ratio, base;
    Thumb thumb;
    Button3D up, down;          /* Line Up/Down Button */

    /** Scroller Constructor */
    public Scroller(int _type) { this(_type, 10);}

    /** Scroller Constructor with Ratio Setting */
    public Scroller(int _type, int _ratio) {
        int tofs;
        ratio = _ratio;
        setLayout(new BorderLayout());
        add("Center", thumb = new Thumb(_type));
        if ( thumb.type == Scrollbar.HORIZONTAL ) {
          add("West", up = new Button3D(Button3D.LEFT));
          add("East", down = new Button3D(Button3D.RIGHT));
        } else {
          add("North", up = new Button3D(Button3D.UP)); 
          add("South", down = new Button3D(Button3D.DOWN)); 
        }
        setBase(18);
        thumb.setValue(0, 1, 0, 1, false);
    }

    /** Set Scale Base */
    public void setBase(int _base) {
        base = _base;
        up.setBase(base);
        down.setBase(base);
    }

    /** Overwrite Preferred Size */
    public Dimension preferredSize() {
        if ( thumb.type == Scrollbar.HORIZONTAL )
          return new Dimension(base*ratio, base);
        else return new Dimension(base, base*ratio);
    }

    /** Set Current Value */
    public synchronized boolean setValue(int _value, int _visible,
        int _minimum, int _maximum, boolean frepaint) {
        thumb.setValue(_value, _visible, _minimum, _maximum, frepaint);
        boolean _active = (thumb.range > thumb.visible);
        up.setActive(_active);
        down.setActive(_active);
        return true;
    }

    /** Set Current Value */
    public synchronized boolean setValue(int _value, boolean frepaint)
    { return thumb.setValue(_value, frepaint);}

    /* Get Scroller Paramters */
    public int getValue() { return thumb.value;}

    /** Component Action Event */
    public boolean action(Event ev, Object arg) {
        if (arg == up) {
            if ( ev.id != Event.MOUSE_UP )
              thumb.moveThumb(-1);
	    return true;
        } else if (arg == down) {
            if ( ev.id != Event.MOUSE_UP )
              thumb.moveThumb(1);
	    return true;
        } else if (arg == thumb) {
            Notify(ev, this);
	    return true;
        }
	return false;
    }
}