package hello;
 
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
 
/**
 * @author Anselmo Battisti
 */
public class HelloMIDlet extends MIDlet implements CommandListener {
 
    private boolean midletPaused = false;
 
    private String[] cidades = {"Tupãssi","JS","Cascavel"};
    private int[][] distancia;
 
    // interface
    private List listInicioTrajeto;
    private List listFimTrajeto;
    private TextBox tbxDistancia;
 
    // comandos
    Command avancar = new Command("Destino",Command.OK,0);
    Command calcular = new Command("Distancia,",Command.OK,0);
 
    //
    private Command exitCommand;
    private Form form;
    private StringItem stringItem;
    //
 
    /**
     * The HelloMIDlet constructor.
     */
    public HelloMIDlet()
    {
        // distancia entre as cidades
        distancia = new int[3][3];
 
        distancia[0][0] = 0;
        distancia[1][1] = 0;
        distancia[2][2] = 0;
 
        distancia[0][1] = 10;
        distancia[1][0] = 10;
 
        distancia[1][2] = 30;
        distancia[2][1] = 30;
 
        distancia[0][2] = 40;
        distancia[2][0] = 40;
    }
 
    private void initialize() {
    }
    public void startMIDlet() {
        switchDisplayable(null, getForm());
    }
 
    public void resumeMIDlet() {
    }
 
    public void switchDisplayable(Alert alert, Displayable nextDisplayable) {
        // write pre-switch user code here
        Display display = getDisplay();
        if (alert == null) {
            display.setCurrent(nextDisplayable);
        } else {
            display.setCurrent(alert, nextDisplayable);
        }
        // write post-switch user code here
    }
 
    public void commandAction(Command command, Displayable displayable) {
 
        if(command == avancar){
            listFimTrajeto.setTitle("Fim do Trajeto");
            listFimTrajeto.addCommand(calcular);
            this.getDisplay().setCurrent(listFimTrajeto);
        } else if (command == calcular){
            String dist = Integer.toString(this.getDistancia(listInicioTrajeto.getSelectedIndex(),listFimTrajeto.getSelectedIndex()));
            tbxDistancia.setString(dist);
            this.getDisplay().setCurrent(tbxDistancia);
        }
    }
 
    /**
     * Returns an initiliazed instance of exitCommand component.
     * @return the initialized component instance
     */
    public Command getExitCommand() {
        if (exitCommand == null) {
            // write pre-init user code here
            exitCommand = new Command("Exit", Command.EXIT, 0);
            // write post-init user code here
        }
        return exitCommand;
    }
 
    public Form getForm() {
        if (form == null) {
            // write pre-init user code here
            form = new Form("Welcome", new Item[] { getStringItem() });
            form.addCommand(getExitCommand());
            form.setCommandListener(this);
            // write post-init user code here
        }
        return form;
    }
 
    public StringItem getStringItem() {
        if (stringItem == null) {
            // write pre-init user code here
            stringItem = new StringItem("Hello", "Hello, World!");
            // write post-init user code here
        }
        return stringItem;
    }
 
    public Display getDisplay () {
        return Display.getDisplay(this);
    }
 
    public void exitMIDlet() {
        switchDisplayable (null, null);
        destroyApp(true);
        notifyDestroyed();
    }
 
    public void startApp()
    {
        listInicioTrajeto = new List("Origem",List.EXCLUSIVE,cidades,null);
        listInicioTrajeto.setCommandListener(this);
 
        listFimTrajeto = new List("Destino",List.EXCLUSIVE,cidades,null);
        listFimTrajeto.setCommandListener(this);
 
        // tela inicial da aplicação
        listInicioTrajeto.setTitle("Inicio do Trajeto");
        listInicioTrajeto.addCommand(avancar);
 
        tbxDistancia = new TextBox("A Distancia eh", "", 30, TextField.ANY);
        this.getDisplay().setCurrent(listInicioTrajeto);
    }
 
    private int getDistancia(int cidInicial, int cidFinal)
    {
        return this.distancia[cidInicial][cidFinal];
    }
 
    public void pauseApp() {
        midletPaused = true;
    }
 
    public void destroyApp(boolean unconditional) {
    }
}