// swt/Menus.java
// ©2016 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://mindviewinc.com/Books/OnJava/ for more book information.
// Fun with menus.
import swt.util.*;
import org.eclipse.swt.*;
import org.eclipse.swt.widgets.*;
import java.util.*;
import java.io.IOException;
import java.nio.file.*;
import java.util.stream.*;

public class Menus implements SWTApplication {
  private static Shell shell;
  @Override
  public void createContents(Composite parent) {
    shell = parent.getShell();
    Menu bar = new Menu(shell, SWT.BAR);
    shell.setMenuBar(bar);
    Set<String> words = null;
    try {
      words = Files.lines(Paths.get("Menus.java"))
        .flatMap(s -> Arrays.stream(s.split("\\W+")))
        .filter(s -> !s.matches("[0-9]+")) // No numbers
        .map(String::trim)
        .collect(Collectors.toCollection(TreeSet::new));
    } catch(IOException e) {
      throw new RuntimeException(e);
    }
    Iterator<String> it = words.iterator();
    MenuItem[] mItem = new MenuItem[7];
    for(int i = 0; i < mItem.length; i++) {
      mItem[i] = new MenuItem(bar, SWT.CASCADE);
      mItem[i].setText(it.next());
      Menu submenu = new Menu(shell, SWT.DROP_DOWN);
      mItem[i].setMenu(submenu);
    }
    int i = 0;
    while(it.hasNext()) {
      addItem(bar, it, mItem[i]);
      i = (i + 1) % mItem.length;
    }
  }
  static Listener listener = new Listener() {
    public void handleEvent(Event e) {
      System.out.println(e.toString());
    }
  };
  void
  addItem(Menu bar, Iterator<String> it, MenuItem mItem) {
    MenuItem item = new MenuItem(mItem.getMenu(),SWT.PUSH);
    item.addListener(SWT.Selection, listener);
    item.setText(it.next());
  }
  public static void main(String[] args) {
    SWTConsole.run(new Menus(), 600, 200);
  }
}