changetablescreen.java

PDA餐饮管理系统,在掌上电脑实现的,可以开台,点菜等多功能模块

package junwei;
import javax.microedition.lcdui.*;
import rms.*;

/**
 * 换台、并台界面
 * @author hong
 *
 */
public class ChangeTableScreen extends InputScreen implements CommandListener{

	private static ChangeTableScreen instance;

	private static StringItem siTableNo;
	private static ChoiceGroup toTable;
    private int tag;//1-换台，2-并台
	
	synchronized public static ChangeTableScreen getInstance(int tag) {
		if (instance == null)
			instance = new ChangeTableScreen();
		siTableNo.setText(MainScreen.getInstance().getCurTableNo());
		instance.tag=tag;
		instance.initTable();
		return instance;
	}

	private ChangeTableScreen() {
		super("换台");
		
		siTableNo=new StringItem("原桌台号：","",Item.PLAIN);
		append(siTableNo);
		
		toTable=new ChoiceGroup("换至桌台：",ChoiceGroup.EXCLUSIVE);
		append(toTable);
		
		addCommand(new Command("确定", Command.OK, 1));
		addCommand(new Command("取消", Command.CANCEL, 1));
		setCommandListener(this);
	}
	
	
	public void commandAction(Command c, Displayable s) {
		String cmd = c.getLabel();
		if (cmd.equals("确定")) {
	 		GetDataThread t = new GetDataThread();
	 		t.init(GetDataThread.rt_work,"ChangeTableServlet?tag="+tag+"&fromTable="
					+ siTableNo.getText()+"&toTable="+toTable.getString(toTable.getSelectedIndex()));
			
			t.start();
		}
   		Navigator.flow(cmd);
	}
	
	private void initTable(){
		toTable.deleteAll();
		Table[] tables=MainScreen.getInstance().all_tables;
		switch (tag){
		case 1:
			setTitle("换台");
			toTable.setLabel("换至桌台：");
			for (int i=0;i<tables.length;i++)
			{
				if (tables[i].getTableNo().equals(siTableNo.getText()))
					continue;
				if (tables[i].getStatus()==Table.ST_free)
					toTable.append(tables[i].getTableNo(),null);
			}
			break;
		case 2:
			setTitle("并台");
			toTable.setLabel("并至桌台：");
			for (int i=0;i<tables.length;i++)
			{
				if (tables[i].getTableNo().equals(siTableNo.getText()))
					continue;
				if (tables[i].getStatus()==Table.ST_use)
					toTable.append(tables[i].getTableNo(),null);
			}
			break;
		}
	}

}