Swt/Jface tableViewer入门教程二（让TableViewer按照列排序)

有一个功能是我们常使用的，就是在列的头上点击一下，整个表的记录按照这个列来排序，再点击一下按照这个列的反序来排序。那JFace是如何实现这个功能的呢？
在JFace中是通过一个排序器来实现的，就是ViewerSorter下边写出详细的步骤
一、定义一个sorter继承自ViewerSorter

import java.util.Date;

import org.eclipse.jface.viewers.Viewer;

import org.eclipse.jface.viewers.ViewerSorter;

public class Sorter extends ViewerSorter

{

private static final int ID = 1;

private static final int NAME = 2;

private static final int SEX = 3;

private static final int AGE = 4;

private static final int CREATE_DATE = 5;

public static final Sorter ID_ASC = new Sorter(ID);

public static final Sorter ID_DESC = new Sorter(-ID);

public static final Sorter NAME_ASC = new Sorter(NAME);

public static final Sorter NAME_DESC = new Sorter(-NAME);

public static final Sorter SEX_ASC = new Sorter(SEX);

public static final Sorter SEX_DESC = new Sorter(-SEX);

public static final Sorter AGE_ASC = new Sorter(AGE);

public static final Sorter AGE_DESC = new Sorter(-AGE);

public static final Sorter CREATE_DATE_ASC = new Sorter(CREATE_DATE);

public static final Sorter CREATE_DATE_DESC = new Sorter(-CREATE_DATE);

private int sortType ;

private Sorter(int sortType)

{

this.sortType = sortType;

}

public int compare(Viewer viewer, Object e1, Object e2)

{

People p1 = (People)e1;

People p2 = (People)e2;

switch(sortType)

{

case ID:

{

Long l1 = p1.getId();

Long l2 = p2.getId();

return l1.compareTo(l2);

}

case -ID:

{

Long l1 = p1.getId();

Long l2 = p2.getId();

return l2.compareTo(l1);

}

case NAME:

{

String s1 = p1.getName();

String s2 = p2.getName();

return s1.compareTo(s2);

}

case -NAME:

{

String s1 = p1.getName();

String s2 = p2.getName();

return s2.compareTo(s1);

}

case SEX:

{

String s1 = p1.getSex();

String s2 = p2.getSex();

return s1.compareTo(s2);

}

case -SEX:

{

String s1 = p1.getSex();

String s2 = p2.getSex();

return s2.compareTo(s1);

}

case AGE:

{

Integer i1 = p1.getAge();

Integer i2 = p2.getAge();

return i1.compareTo(i2);

}

case -AGE:

{

Integer i1 = p1.getAge();

Integer i2 = p2.getAge();

return i2.compareTo(i1);

}

case CREATE_DATE:

{

Date d1 = p1.getCreateDate();

Date d2 = p2.getCreateDate();

d1.compareTo(d2);

}

case -CREATE_DATE:

{

Date d1 = p1.getCreateDate();

Date d2 = p2.getCreateDate();

d2.compareTo(d1);

}

return 0;

}

二、在TableViewer上，为每一列加入事件监听器类似这样的结构

newColumnTableColumn.addSelectionListener( new SelectionAdapter()

{

boolean asc = true;

public void widgetSelected(SelectionEvent e)

{

tableViewer.setSorter(asc?Sorter.ID_ASC:Sorter.ID_DESC);

asc = !asc;

}

} );

都加入后TestTableViewer的结果：

import org.eclipse.jface.viewers.TableViewer;

import org.eclipse.swt.SWT;

import org.eclipse.swt.events.SelectionAdapter;

import org.eclipse.swt.events.SelectionEvent;

import org.eclipse.swt.layout.FillLayout;

import org.eclipse.swt.widgets.Display;

import org.eclipse.swt.widgets.Shell;

import org.eclipse.swt.widgets.Table;

import org.eclipse.swt.widgets.TableColumn;

public class TestTableViewer

{

private static Table table;

/** *//**

* Launch the application

* @param args

public static void main(String[] args)

{

final Display display = Display.getDefault();

final Shell shell = new Shell();

shell.setSize(500, 375);

shell.setText("SWT Application");

table = tableViewer.getTable();

table.setLinesVisible(true);

table.setHeaderVisible(true);

table.setBounds(97, 79, 373, 154);

final TableColumn newColumnTableColumn = new TableColumn(table, SWT.NONE);

newColumnTableColumn.setWidth(39);

newColumnTableColumn.setText("ID");

//加入事件监听器

newColumnTableColumn.addSelectionListener(new SelectionAdapter()

{

boolean asc = true;

public void widgetSelected(SelectionEvent e)

{

tableViewer.setSorter(asc?Sorter.ID_ASC:Sorter.ID_DESC);

asc = !asc;

}

});

final TableColumn newColumnTableColumn_1 = new TableColumn(table, SWT.NONE);

newColumnTableColumn_1.setWidth(85);

newColumnTableColumn_1.setText("姓名");

// 加入事件监听器

newColumnTableColumn_1.addSelectionListener(new SelectionAdapter()

{

boolean asc = true;

public void widgetSelected(SelectionEvent e)

{

tableViewer.setSorter(asc?Sorter.NAME_ASC:Sorter.NAME_DESC);

asc = !asc;

}

});

final TableColumn newColumnTableColumn_2 = new TableColumn(table, SWT.NONE);

newColumnTableColumn_2.setWidth(41);

newColumnTableColumn_2.setText("性别");

// 加入事件监听器

newColumnTableColumn_2.addSelectionListener(new SelectionAdapter()

{

boolean asc = true;

public void widgetSelected(SelectionEvent e)

{

tableViewer.setSorter(asc?Sorter.SEX_ASC:Sorter.SEX_DESC);

asc = !asc;

}

});

final TableColumn newColumnTableColumn_3 = new TableColumn(table, SWT.NONE);

newColumnTableColumn_3.setWidth(43);

newColumnTableColumn_3.setText("年龄");

// 加入事件监听器

newColumnTableColumn_3.addSelectionListener(new SelectionAdapter()

{

boolean asc = true;

public void widgetSelected(SelectionEvent e)

{

tableViewer.setSorter(asc?Sorter.AGE_ASC:Sorter.AGE_DESC);

asc = !asc;

}

});

final TableColumn newColumnTableColumn_4 = new TableColumn(table, SWT.NONE);

newColumnTableColumn_4.setWidth(126);

newColumnTableColumn_4.setText("创建日期");

// 加入事件监听器

newColumnTableColumn_4.addSelectionListener(new SelectionAdapter()

{

boolean asc = true;

public void widgetSelected(SelectionEvent e)

{

tableViewer.setSorter(asc?Sorter.CREATE_DATE_ASC:Sorter.CREATE_DATE_DESC);

asc = !asc;

}

});

tableViewer.setContentProvider(new ContentProvider());

tableViewer.setLabelProvider(new TableLabelProvider());

tableViewer.setInput(People.getPeople());

shell.open();

shell.setLayout(new FillLayout());

shell.layout();

while (!shell.isDisposed())

{

if (!display.readAndDispatch())

display.sleep();

}

试一下结果是不是出来了？
好了，最后解释几点：
1，sorter中利用了jdk的compareTo来实现比较，当然你也可以根据自己的需求来实现。
2, sorter中利用了"-"符号来得到正负数字，用来表现升序、降序。
source下载： http://www.blogjava.net/Files/dreamstone/jface-2.rar

Swt/Jface tableViewer入门教程二（让TableViewer按照列排序)

Swt/Jface tableViewer入门教程二（让TableViewer按照列排序)

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