ServiceScroller.java

package de.calette.mephisto3.ui;

import de.calette.mephisto3.Mephisto3;
import de.calette.mephisto3.control.ControlListener;
import de.calette.mephisto3.control.ServiceControlEvent;
import de.calette.mephisto3.control.ServiceController;
import de.calette.mephisto3.control.ServiceState;
import javafx.application.Platform;
import javafx.geometry.Insets;
import javafx.geometry.Orientation;
import javafx.scene.control.ScrollBar;
import javafx.scene.layout.BorderPane;

/**
 * The footer only contains the scrollbar, indicating
 * the position of the current selection, e.g. for radio stations.
 */
public class ServiceScroller extends BorderPane implements ControlListener {
  private ScrollBar sc;

  public ServiceScroller() {
    setMaxWidth(Mephisto3.WIDTH);
    sc = new ScrollBar();
    sc.setOrientation(Orientation.HORIZONTAL);
    //this will hide the already invisible scroll buttons
    sc.setPadding(new Insets(0, -20, 0, -20));
    sc.setId("scroller");
    sc.setMin(0);

    sc.setVisibleAmount(0.9);
    setCenter(sc);
  }

  public void showScroller() {
    ServiceState serviceState = ServiceController.getInstance().getServiceState();
    sc.setMax(serviceState.getModels().size() - 1);
    sc.setValue(serviceState.getServiceIndex());
    ServiceController.getInstance().addControlListener(this);
  }
  
  public void updateSelection() {
    ServiceState serviceState = ServiceController.getInstance().getServiceState();
    sc.setValue(serviceState.getServiceIndex());    
  }

  public void hideScroller() {
    ServiceController.getInstance().removeControlListener(this);
  }

  @Override
  public void controlEvent(final ServiceControlEvent event) {
    ServiceControlEvent.EVENT_TYPE eventType = event.getEventType();
    if(eventType.equals(ServiceControlEvent.EVENT_TYPE.NEXT) || eventType.equals(ServiceControlEvent.EVENT_TYPE.PREVIOUS)) {
      Platform.runLater(new Runnable() {
        @Override
        public void run() {
          final int serviceIndex = event.getServiceState().getServiceIndex();
          sc.setValue(serviceIndex);
        }
      });

    }
  }
}