content: package tim.prune.load.babel;
  
  import java.awt.BorderLayout;
  import java.awt.Component;
  import java.awt.GridLayout;
  
  import javax.swing.Box;
  import javax.swing.BoxLayout;
  import javax.swing.JComboBox;
  import javax.swing.JLabel;
  import javax.swing.JPanel;
  
  import tim.prune.I18nManager;
  import tim.prune.gui.DecimalNumberField;
  import tim.prune.gui.WholeNumberField;
  
  /**
   * Interpolate filter for GPSBabel (adding extra points, does that make it still a filter?)
   * Very similar to the distance filter in terms of gui
   */
  public final class InterpolateFilter extends FilterDefinition
  {
  	/** Constructor */
  	public InterpolateFilter(AddFilterDialog inFilterDialog)
  	{
  		super(inFilterDialog);
  		makePanelContents();
  	}
  
  	private DecimalNumberField _distField = null;
  	private JComboBox<String> _distUnitsCombo = null;
  	private WholeNumberField _secondsField = null;
  
  
  	/** @return filter name */
  	protected String getFilterName() {
  		return "interpolate";
  	}
  
  	/** Make the panel contents */
  	protected void makePanelContents()
  	{
  		setLayout(new BorderLayout());
  		JPanel boxPanel = new JPanel();
  		boxPanel.setLayout(new BoxLayout(boxPanel, BoxLayout.Y_AXIS));
  		add(boxPanel, BorderLayout.NORTH);
  		JLabel topLabel = new JLabel(I18nManager.getText("dialog.gpsbabel.filter.interpolate.intro"));
  		topLabel.setAlignmentX(Component.LEFT_ALIGNMENT);
  		boxPanel.add(topLabel);
  		boxPanel.add(Box.createVerticalStrut(18)); // spacer
  		// Main three-column grid
  		JPanel gridPanel = new JPanel();
  		gridPanel.setLayout(new GridLayout(0, 3, 4, 4));
  		gridPanel.add(new JLabel(I18nManager.getText("dialog.gpsbabel.filter.interpolate.distance")));
  		_distField = new DecimalNumberField();
  		_distField.addKeyListener(_paramChangeListener);
  		gridPanel.add(_distField);
  		_distUnitsCombo = new JComboBox<String>(new String[] {I18nManager.getText("units.kilometres"), I18nManager.getText("units.miles")});
  		gridPanel.add(_distUnitsCombo);
  		gridPanel.add(new JLabel(I18nManager.getText("dialog.gpsbabel.filter.interpolate.time")));
  		_secondsField = new WholeNumberField(4);
  		_secondsField.addKeyListener(_paramChangeListener);
  		gridPanel.add(_secondsField);
  		gridPanel.add(new JLabel(I18nManager.getText("units.seconds")));
  		gridPanel.setAlignmentX(Component.LEFT_ALIGNMENT);
  		boxPanel.add(gridPanel);
  	}
  
  	/**
  	 * @return true if the filters are valid
  	 */
  	public boolean isFilterValid()
  	{
  		final boolean distGiven = !_distField.isEmpty();
  		final boolean timeGiven = !_secondsField.isEmpty();
  		if ((!distGiven && !timeGiven) || (distGiven && timeGiven)) {
  			return false; // either one or the other, not both
  		}
  		if (distGiven && _distField.getValue() < 0.0001) {
  			return false; // must have a decent distance
  		}
  		if (timeGiven && _secondsField.getValue() <= 1) {
  			return false; // must have a decent number of seconds
  		}
  		// must be ok
  		return true;
  	}
  
  	/**
  	 * @return filter parameters as a string, or null
  	 */
  	protected String getParameters()
  	{
  		if (!isFilterValid()) return null;
  		StringBuilder builder = new StringBuilder();
  		final boolean distGiven = !_distField.isEmpty();
  		final boolean timeGiven = !_secondsField.isEmpty();
  		if (distGiven)
  		{
  			// Get the distance
  			double dValue = _distField.getValue();
  			builder.append(",distance=").append(dValue);
  			// units of distance (km or miles)
  			builder.append(_distUnitsCombo.getSelectedIndex() == 0 ? "k" : "m");
  		}
  		else if (timeGiven) {
  			// time
  			builder.append(",time=").append(_secondsField.getValue()); // no s at the end
  		}
  		return builder.toString();
  	}
  }
  