package com.j2medev.chapter3.dialog;

import javax.microedition.lcdui.*;

public class ConfirmationDialog extends Dialog implements CommandListener {
    
    //定義兩個常量代表用戶的選擇
    public static final int YES = 0;
    public static final int NO = 1;
    protected Form wait;//用于實現對話框的組件
    protected Command noCommand;
    protected Command yesCommand;
    private String message;
    private String yesLabel;
    private String noLabel;
    
    public ConfirmationDialog(Display display, String message) {
        this(display, message, null, null);
    }
    
    public ConfirmationDialog(Display display, String amessage,
            String ayesLabel, String anoLabel) {
        super(display);
        this.message = (amessage == null) ? "繼續操作？" : amessage;
        this.yesLabel = (yesLabel == null) ? "確定" : ayesLabel;
        this.noLabel = (noLabel == null) ? "返回" : anoLabel;
        yesCommand = new Command(yesLabel, Command.OK, 1);
        noCommand = new Command(noLabel, Command.CANCEL, 1);
        wait = new Form("對話框");
        wait.append(message);
        wait.addCommand(yesCommand);
        wait.addCommand(noCommand);
        wait.setCommandListener(this);
    }
    
    public void commandAction(Command c, Displayable d) {
        if (c == yesCommand) {
            dismiss(YES);
        } else if (c == noCommand) {
            dismiss(NO);
        }
    }
    //實現Dialog的抽象方法，返回wait。
    protected Displayable getDisplayable() {
        return wait;
    }
}