import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
import java.util.*;

public class PrefUnits extends PrefEditor implements java.io.Serializable {

  private static final long serialVersionUID = Version.getSUID();

  public Unit screenunit = Unit.inch;
  public Unit surveyunit = Unit.foot;

  Carto target;

  public PrefUnits() {
    name = "Default Units";
    screenunit = Carto.defscreenunit;
    surveyunit = Carto.defmapunit;
  }

  public PrefUnits(Carto target) {
    this.target = target;
    name = "Units"; 
    screenunit = target.screenunit;
    surveyunit = target.mapunit;
  }

  public void newPane() throws NoSuchFieldException {
    pane = new javax.swing.Box(BoxLayout.Y_AXIS);
    setUnit("screenunit",Unit.predefined,"Screen units");
    setUnit("surveyunit",Unit.predefined,"Survey units");
  }

  public void save() {
    if (pane==null) return;
    super.save();
    apply();
  }

  public void apply() {
    if (target==null) {
      Carto.defscreenunit = screenunit;
      Carto.defmapunit = surveyunit;
    } else {
      target.screenunit = screenunit;
      target.mapunit = surveyunit;
    }
  }
}