一个完整的TableViewer实例

http://tieba.baidu.com/f?kz=168159793

一、前言 
　　在《Eclipse从入门到精通》一书中，TableViewer的例子还是被相对简化了的，今天（2005年8月30日）在开发中正好涉及到这方面，于是将代码提取出来，帖在这里以供读者参考。　　 

二、实例说明 
实例的示例图如下： 


例图说明： 
（1）提供一个表格，表格有两列。第一列是一个文本框，可直接编辑。第二列是一个下拉框。 
（2）实现“删除”按钮的功能，但“新增、修改”按钮功能未实现 
（3）当点击“OK”按钮时，则界面上的数据情况打印出来。如下图。 

其他说明： 
（1） 本文的数据涉及到Log4j，读者需要了解一些Log4j的Level类的知识。Log4j的文档，网上一搜一大把，本文就省略不说了。 
（2）因为要用到log4j，所以需要log4j的jar包加入到引用库中。（操作方法参考书的P261） 


三、程序实现 
第一步：构造数据模型。经过对界面的数据进行分析后，创建一个数据类，代码如下： 

import java.util.ArrayList; 
import java.util.List; 
public class LogMonitorSet { 
  private String name; 
  private boolean selected; 
  private int logLevel; 
  private List loggers = new ArrayList(1); 
  public List getLoggers() { 
    return loggers; 
  } 
  public void setLoggers(List loggers) { 
    this.loggers = loggers; 
  } 
  public void addLogger(String logger) { 
    this.loggers.add(logger); 
  } 
  public void removeLogger(String logger) { 
    this.loggers.remove(logger); 
  } 
  public int getLogLevel() { 
    return logLevel; 
  } 
  public void setLogLevel(int logLevel) { 
    this.logLevel = logLevel; 
  } 
  public String getName() { 
    return name; 
  } 
  public void setName(String name) { 
    this.name = name; 
  } 
  public boolean getSelection() { 
    return selected; 
  } 
  public void setSelection(boolean selected) { 
    this.selected = selected; 
  } 
} 

  说明： 

（1）name相对于表格中的“集合名称” 
（2）selected相对于表格中的Check框 
（3）logLevel相对于表格中的“日志级别” 
（4）loggers这个属性是为以后用的，本文读者不必管它。

第二步：实例主界面程序 

import java.util.ArrayList; 
import java.util.List; 
import org.apache.log4j.Level; 
import org.eclipse.jface.dialogs.Dialog; 
import org.eclipse.jface.viewers.CellEditor; 
import org.eclipse.jface.viewers.CheckStateChangedEvent; 
import org.eclipse.jface.viewers.CheckboxTableViewer; 
import org.eclipse.jface.viewers.ColumnWeightData; 
import org.eclipse.jface.viewers.ComboBoxCellEditor; 
import org.eclipse.jface.viewers.ICellModifier; 
import org.eclipse.jface.viewers.ICheckStateListener; 
import org.eclipse.jface.viewers.IStructuredSelection; 
import org.eclipse.jface.viewers.TableLayout; 
import org.eclipse.jface.viewers.TableViewer; 
import org.eclipse.jface.viewers.TextCellEditor; 
import org.eclipse.swt.SWT; 
import org.eclipse.swt.events.SelectionAdapter; 
import org.eclipse.swt.events.SelectionEvent; 
import org.eclipse.swt.layout.GridData; 
import org.eclipse.swt.layout.GridLayout; 
import org.eclipse.swt.layout.RowLayout; 
import org.eclipse.swt.widgets.Button; 
import org.eclipse.swt.widgets.Composite; 
import org.eclipse.swt.widgets.Control; 
import org.eclipse.swt.widgets.Shell; 
import org.eclipse.swt.widgets.Table; 
import org.eclipse.swt.widgets.TableColumn; 
import org.eclipse.swt.widgets.TableItem; 
/** 
* @author ChenGang 
*/ 
public class LogMonitorDialog extends Dialog { 
  private TableViewer tv; 
  private CheckboxTableViewer ctv; 
  private String[] levelStrArray = LogHelper.getLevelShowStrings(); 
  public LogMonitorDialog(Shell parentShell) { 
    super(parentShell); 
  } 
  protected Control createDialogArea(Composite parent) { 
    Composite topComp = new Composite(parent, SWT.NONE); 
    topComp.setLayoutData(new GridData(GridData.FILL_BOTH)); //加此一句张开面板 
    topComp.setLayout(new GridLayout()); 
    { 
        tv = new TableViewer(topComp, SWT.CHECK | SWT.MULTI | SWT.BORDER | SWT.FULL_SELECTION); 
        tv.setUseHashlookup(true); 
        ctv = new CheckboxTableViewer(tv.getTable()); 
        Table table = tv.getTable(); 
        table.setHeaderVisible(true); //显示表头 
        table.setLinesVisible(true); //显示表格线 
        GridData gridData = new GridData(GridData.FILL_HORIZONTAL); 
        gridData.heightHint = 100; 
        table.setLayoutData(gridData); 
        TableLayout tLayout = new TableLayout(); //专用于表格的布局 
        table.setLayout(tLayout); 
        //建立TableViewer中的列 
        tLayout.addColumnData(new ColumnWeightData(40)); 
        new TableColumn(table, SWT.NONE).setText("集合名称"); 
        tLayout.addColumnData(new ColumnWeightData(40)); 
        new TableColumn(table, SWT.NONE).setText("日志级别"); 
        { 
          tv.setColumnProperties(new String[] { "name", "level" });//定义每一列的别名 
          CellEditor[] cellEditors = new CellEditor[2]; 
          cellEditors[0] = new TextCellEditor(table); 
          cellEditors[1] = new ComboBoxCellEditor(table, levelStrArray, SWT.READ_ONLY); 
          tv.setCellEditors(cellEditors); 
        } 
        tv.setContentProvider(new DefaultContentProvider()); 
        tv.setLabelProvider(new MyLabelProvider(ctv)); 
        tv.setCellModifier(new MyCellModifier()); 
        tv.setInput(getInputData()); 
        ctv.addCheckStateListener(new ICheckStateListener() { 
          public void checkStateChanged(CheckStateChangedEvent event) { 
            LogMonitorSet o = (LogMonitorSet) event.getElement(); 
            o.setSelection(event.getChecked()); 
          } 
        }); 
    } 
    { 
        Composite comp = new Composite(topComp, SWT.NONE); 
        comp.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); 
        comp.setLayout(new RowLayout()); 
        Button addButton = new Button(comp, SWT.PUSH); 
        addButton.setText("　　新增　　"); 
        addButton.addSelectionListener(new SelectionAdapter() { 
          public void widgetSelected(SelectionEvent e) { 
          //TODO 
          } 
        }); 
        Button editButton = new Button(comp, SWT.PUSH); 
        editButton.setText("　　修改　　"); 
        editButton.addSelectionListener(new SelectionAdapter() { 
          public void widgetSelected(SelectionEvent e) { 
          //TODO 
          } 
        }); 
        Button removeButton = new Button(comp, SWT.PUSH); 
        removeButton.setText("　　删除　　"); 
        removeButton.addSelectionListener(new SelectionAdapter() { 
public void widgetSelected(SelectionEvent e) { 
            IStructuredSelection selection = (IStructuredSelection) tv.getSelection(); 
            LogMonitorSet m = (LogMonitorSet) ((selection).getFirstElement()); 
            if (m != null) { 
                //先预先移动到下一行 
                Table table = tv.getTable(); 
                int i = table.getSelectionIndex(); //取得当前所选行的序号，如没有则返回-1 
                table.setSelection(i + 1); //当前选择行移下一行 
                //删除 
                tv.remove(m);//从界面上删除 
                ((List) tv.getInput()).remove(m); //从数据模型中删除 
            } 
          } 
        }); 
    } 
    return topComp; 
  } 
  private List getInputData() { 
    //Test code 
    List list = new ArrayList(3); 
    { 
        LogMonitorSet lms = new LogMonitorSet(); 
        lms.setSelection(false); 
        lms.setName("aaaaa"); 
        lms.setLogLevel(Level.INFO_INT); 
        list.add(lms); 
    } 
    { 
        LogMonitorSet lms = new LogMonitorSet(); 
        lms.setSelection(true); 
        lms.setName("bbbb"); 
        lms.setLogLevel(Level.DEBUG_INT); 
        list.add(lms); 
    } 
    { 
        LogMonitorSet lms = new LogMonitorSet(); 
        lms.setSelection(false); 
        lms.setName("cccc"); 
        lms.setLogLevel(Level.ERROR_INT); 
        lms.addLogger("com.wxxr.jboss"); 
        lms.addLogger("com.wxxr.sms"); 
        list.add(lms); 
    } 
    return list; 
    //     return Collections.EMPTY_LIST; 
  } 
  public LogMonitorSet[] getDialogData() { 
    List list = (List) tv.getInput(); 
    LogMonitorSet[] array = new LogMonitorSet[list.size()]; 
    list.toArray(array); 
    return array; 
  } 
  /** 
  * 标签器 
  */ 
  private final static class MyLabelProvider extends TableLabelProviderAdapter { 
    private CheckboxTableViewer ctv; 
    public MyLabelProvider(CheckboxTableViewer ctv) { 
        this.ctv = ctv; 
    } 
    public String getColumnText(Object element, int col) { 
        LogMonitorSet o = (LogMonitorSet) element; 
        if (col == 0) { 
          ctv.setChecked(o, o.getSelection()); 
          return o.getName(); 
        } 
        if (col == 1) { 
          return LogHelper.getLevelShowString(o.getLogLevel()); 
        } 
        return ""; 
    } 
  } 
  /** 
  * 修改方法类 
  */ 
  private class MyCellModifier implements ICellModifier { 
    /** 
      * 是否可以修改此单元格。这里设置了任一单元格都可以修改。 
      * @param element 表格记录对象 
      * @param property 列的别名 
      */ 
    public boolean canModify(Object element, String property) { 
        return true; 
    } 
    /** 
      * 由此方法决定，当单击单元格出现CellEditor时应该显示什么值。 
      */ 
    public Object getValue(Object element, String property) { 
        LogMonitorSet o = (LogMonitorSet) element; 
        if (property.equals("name")) { 
          return o.getName(); 
        } 
        if (property.equals("level")) { 
          int index = LogHelper.getLevelIndex(o.getLogLevel()); 
          return new Integer(index); 
 } 
        return ""; 
    } 
    /** 
      * 从CellEditor取值得此单元格的值。 
      * @param value 修改的新值 
      */ 
    public void modify(Object element, String property, Object value) { 
        TableItem tableItem = (TableItem) element; 
        LogMonitorSet o = (LogMonitorSet) tableItem.getData(); 
        if (property.equals("name")) { 
          String newValue = (String) value; 
          if (!o.getName().equals(newValue)) { 
            o.setName(newValue); 
            tv.update(o, null);//或 tv.refresh(); 确认并更新修改 
          } 
        } 
        if (property.equals("level")) { 
          Integer newValue = (Integer) value; 
          String levelStr = levelStrArray[newValue.intValue()]; 
          int levelInt = LogHelper.getLevelInt(levelStr); 
          if (o.getLogLevel() != levelInt) { 
            o.setLogLevel(levelInt); 
            tv.update(o, null);//或 tv.refresh(); 确认并更新修改 
          } 
        } 
    } 
  } 
} 

 上面的类用到的一些类的代码如下：

import org.eclipse.jface.viewers.ILabelProviderListener; 
import org.eclipse.jface.viewers.ITableLabelProvider; 
import org.eclipse.swt.graphics.Image; 
/** 
* 标签器的适配器，提供一些不常用方法的空实现，以助简化代码 
* @author ChenGang 
* @version 1.0 2004-5-8 
*/ 
public abstract class TableLabelProviderAdapter implements ITableLabelProvider { 
  public Image getColumnImage(Object arg0, int arg1) { 
    return null; 
  } 
  public boolean isLabelProperty(Object arg0, String arg1) { 
    return false; 
  } 
  public void addListener(ILabelProviderListener arg0) {} 
  public void removeListener(ILabelProviderListener arg0) {} 
  public void dispose() {} 
} 


import java.util.List; 
import org.eclipse.jface.viewers.IStructuredContentProvider; 
import org.eclipse.jface.viewers.Viewer; 
/** 
* 一个默认实现的内容器 
* @author ChenGang 
* @version 1.0, 2004-5-14 
*/ 
public class DefaultContentProvider implements IStructuredContentProvider { 
  public Object[] getElements(Object element) { 
    if (element instanceof List) 
        return ((List) element).toArray(); 
    if (element instanceof Object[]) 
        return (Object[]) element; 
    return new Object[0]; 
  } 
  public void dispose() {} 
  public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {} 
} 


import org.apache.log4j.Level; 
public class LogHelper { 
  public static final int NONE = -1; 
  private LogHelper() {} 
  public static String getLevelShowString(Level level) { 
    //     return AdminConsolePlugin.getResourceString(level.toString()); 
    return level.toString() + "（中文）"; 
  } 
  public static String getLevelShowString(int levelInt) { 
    Level level = Level.toLevel(levelInt); 
    return getLevelShowString(level); 
  } 
  public static String[] getLevelShowStrings() { 
    String[] strs = new String[5]; 
    strs[0] = getLevelShowString(Level.DEBUG); 
    strs[1] = getLevelShowString(Level.INFO); 
    strs[2] = getLevelShowString(Level.WARN); 
    strs[3] = getLevelShowString(Level.ERROR); 
    strs[4] = getLevelShowString(Level.FATAL); 
    return strs; 
  } 
  private static Level[] getLevels() { 
    Level[] levels = new Level[5]; 
    levels[0] = Level.DEBUG; 
    levels[1] = Level.INFO; 
    levels[2] = Level.WARN; 
    levels[3] = Level.ERROR; 
    levels[4] = Level.FATAL; 
    return levels; 
  } 
  public static int getLevelInt(String levelShowString) { 
    String[] strs = getLevelShowStrings(); 
    Level[] levels = getLevels(); 
    for (int i = 0; i < strs.length; i++) { 
        if (strs.equals(levelShowString)) { 
          return levels.toInt(); 
        } 
    } 
    return NONE; 
  } 
  public static int getLevelIndex(int levelInt) { 
    Level[] levels = getLevels(); 
    for (int i = 0; i < levels.length; i++) { 
        if (levels.toInt() == levelInt) { 
          return i; 
        } 
    } 
    return NONE; 
  } 
} 

 最后是入口程序，把这个程序当成SWT程序运行。 

import org.eclipse.jface.dialogs.IDialogConstants; 
import org.eclipse.swt.widgets.Shell; 
public class TestLogMonitorDialog { 
  public static void main(String[] args) { 
    Shell shell = new Shell(); 
    LogMonitorDialog d = new LogMonitorDialog(shell); 
    if (d.open() == IDialogConstants.OK_ID) { 
        LogMonitorSet[] lms = d.getDialogData(); 
        for (int i = 0; i < lms.length; i++) { 
          LogMonitorSet o = lms; 
          System.out.println(o.getSelection() + "__" + o.getName() + "__" + LogHelper.getLevelShowString(o.getLogLevel())); 
        } 
    } 
  } 
}