Swt/Jface tableViewer入门教程2

来源：互联网发布：unity3d 面部表情编辑：程序博客网时间：2024/06/08 22:09

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"); // final TableViewer tableViewer = new TableViewer(shell, SWT.CHECK|SWT.MULTI | SWT.FULL_SELECTION | SWT.BORDER|SWT.V_SCROLL|SWT.H_SCROLL); 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。