LWUIT 上实现 Grid表格

本文来自http://blog.csdn.net/hellogv/,转载务必注明出处!

最近不断在使用LWUIT,发觉LWUIT做的特效的确很不错，不过，有些LCDUI上的高级控件，例如StringsItem却没有。但是，可以用LWUIT现有的控件和排列方式来自己做个Gird,无须画图，大小自适应。。。。。。。。


废话就不多说了，直接贴出封装好的Grid代码：

package com.sun.lwuit.uidemo;
import com.sun.lwuit.Button;
import com.sun.lwuit.Component;
import com.sun.lwuit.Container;
import com.sun.lwuit.events.FocusListener;
import com.sun.lwuit.layouts.BoxLayout;
import com.sun.lwuit.layouts.GridLayout;
import com.sun.lwuit.plaf.Style;
/**
 * 使用LWUIT的GridLayout实现Grid，并且可以取得被选中的Item的值
 * @author 张国威
 */
public class LwuitGrid {
    public  String sel_column;//被选中的item所在的column
    public  String sel_value;//被选中的item的值
    public  int sel_X;//被选中的item的X坐标
    public  int sel_Y;//被选中的item的Y坐标
    private String[] columns;
    private String[] values;
    class GridBtn extends Button{//给原Button控件添加新的属性
        public int Xpos;
        public int Ypos;
    }
  /******************************************************************************
   * 创建Grid
   * @return Container
   *****************************************************************************/
    public Container CreateGrid(String []tmp_columns,Style columnstyle,String []tmp_values,Style labelstyle,boolean scrollable)
    {
         columns=tmp_columns;
         values=tmp_values;
         int lines = (tmp_values.length / tmp_columns.length) + 1;//取得行数
         Container grid = new Container(new BoxLayout(BoxLayout.Y_AXIS));
         grid.setScrollable(scrollable);//不知道为什么，为true时X轴可以滚动，却Y轴不能滚动
         grid.setLayout(new GridLayout(lines, tmp_columns.length));//设置排列
         for (int i = 0; i < tmp_columns.length; i++) {//先排列出column
             GridBtn btn=new GridBtn();
             btn.setText(tmp_columns[i]);//设置column的标题
             if(columnstyle!=null)
                 btn.setStyle(columnstyle);
             btn.setAlignment(Button.CENTER);
             btn.setTextPosition(Button.TOP);
             btn.addFocusListener(new ButtonFocusListener());
             btn.Xpos=i;//处于第一行,只管X坐标
             btn.Ypos=0;
             grid.addComponent(btn);
         }
         for (int i = 0; i < tmp_values.length; i++) {//排列出values
             GridBtn btn=new GridBtn();
             btn.setText(tmp_values[i]);
             if(labelstyle!=null)
                 btn.setStyle(labelstyle);
             btn.getStyle().setBgTransparency(0);
             btn.setAlignment(Button.CENTER);
             btn.setTextPosition(Button.TOP);
             btn.setBorderPainted(false);
             btn.Ypos=i/tmp_columns.length+1;//取得选中的行数,因为标题行作为第一行，所以表格从第二行开始
             btn.Xpos=i-tmp_columns.length*(btn.Ypos-1);//取得选中的列数
             btn.addFocusListener(new ButtonFocusListener());
             grid.addComponent(btn);
         }
         return grid;
    }
    private class ButtonFocusListener implements FocusListener {
          
       /******************************************************************************    
       * 选中时，计算出被选中的ITEM的位置和值
       * @return Container
       *****************************************************************************/
        public void focusGained(Component arg0) {
           GridBtn b=(GridBtn) arg0;
           sel_X=b.Xpos;
           sel_Y=b.Ypos;
           if(sel_Y==0)
           {
               sel_column=columns[sel_X];
               sel_value="";
           }
           else {
               sel_column=columns[sel_X];
               sel_value=values[(sel_Y-1)*columns.length+sel_X];
           }
        }
        public void focusLost(Component arg0) {
        }
    }
}

接下来的是调用代码:

public class ShowGrid implements ActionListener {
    public Form form = new Form("ShowGrid");
    private  Command okCommand = new Command("OK", 1);
    LwuitGrid grid=new LwuitGrid();
    ShowGrid()
    {
        String[] column = {"ID", "DATA", "TEXT", "MEMO"};
        String[] label={"AAAAA","BBBBBBBBB", "CCCCCC", "DDDDDDD", "EEEEEEEE", "FFFFFFFFF",
        "GGGGGGG", "HHHHHHH", "JJJJJJJJJJ", "KKKKKKKK", "LLLLLLLLL", "MMMMMMMMMM", "NNNNNNNNNNN"
        , "XXXXXXXX", "YYYYYYYY", "UUUUUUUUU", "IIIIIIIIII", "OOOOOOOOOOOO"};
        form.addComponent(grid.CreateGrid(column,null,label,null,false));    
        form.addCommand(okCommand);
        form.setCommandListener(this);
    }
 
    public void actionPerformed(ActionEvent arg0) {
        String msg="column: "+grid.sel_column+"/n"+
                   "value: "+grid.sel_value+"/n"+
                   "X: "+grid.sel_X+"/n"+
                   "Y: "+grid.sel_Y;
        Dialog.show("Grid", msg, "", "OK");
    }
}