Swt/Jface treeViewer的使用
上边介绍了，tableviewer，这里介绍一下treeViewer，总的流程类似。 一、构造一个树形结构的数据出来，这里选择国家、城市、人来构造一个树形结构，代码如下: 1，定义一个接口
import java.util.List; public interface Itree { public String getName(); public void setName(String name); public void setChildren(List Children); public List getChildren(); }
2，国家
import java.util.ArrayList; import java.util.List; public class Country implements Itree{ private Long id; private String name; private List children = new ArrayList(); public Country(){ } public Country(String name){ this.name = name; } public List getChildren() { return children; } public void setChildren(List children) { this.children = children; } public Long getId() { return id; } public void setId(Long id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } } 
3，城市
import java.util.ArrayList; import java.util.List; public class City implements Itree{ private Long id; private String name; private List children = new ArrayList(); public City(){ } public City(String name){ this.name = name; } public List getChildren() { return children; } public void setChildren(List children) { this.children = children; } public Long getId() { return id; } public void setId(Long id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } }
4，人
import java.util.ArrayList; import java.util.List; public class People implements Itree{ private Long id; private String name; public People(){ } public People(String name){ this.name = name; } public List getChildren() { return null; } public void setChildren(List children) { } public Long getId() { return id; } public void setId(Long id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } }
5,把这些元素组织起来
import java.util.ArrayList; import java.util.List; public class Factory { @SuppressWarnings("unchecked") public static List createTree(){ //生成国家 Country cn = new Country("中国"); Country us = new Country("美国"); Country jp = new Country("日本"); //生成城市 City beijing = new City("北京"); City shanghai = new City("上海"); City newyork = new City("纽约"); City la = new City("洛杉矶"); City tokyo = new City("东京"); City osaka = new City("大阪"); //北京人 ArrayList list = new ArrayList(); list.add(new People("张三")); list.add(new People("李四")); list.add(new People("王五")); beijing.setChildren(list); //上海人 list = new ArrayList(); list.add(new People("翠花")); list.add(new People("小红")); list.add(new People("小崔")); shanghai.setChildren(list); //纽约人 list = new ArrayList(); list.add(new People("tom")); list.add(new People("rose")); list.add(new People("john")); newyork.setChildren(list); //洛杉矶人 list = new ArrayList(); list.add(new People("Sofia")); list.add(new People("sarah")); list.add(new People("Jennifer")); la.setChildren(list); //东京人 list = new ArrayList(); list.add(new People("渡边")); list.add(new People("鬼冢")); list.add(new People("山本")); tokyo.setChildren(list); //大阪人 list = new ArrayList(); list.add(new People("奈奈子")); list.add(new People("菜菜子")); list.add(new People("新垣结衣")); osaka.setChildren(list); //关联城市与国家 //中国 ArrayList citys = new ArrayList(); citys.add(beijing); citys.add(shanghai); cn.setChildren(citys); //美国 citys = new ArrayList(); citys.add(newyork); citys.add(la); us.setChildren(citys); //日本 citys = new ArrayList(); citys.add(tokyo); citys.add(osaka); jp.setChildren(citys); //国家列表 ArrayList countrys = new ArrayList(); countrys.add(cn); countrys.add(us); countrys.add(jp); return countrys; } }
二、定义内容器和标签器 1,内容器
import java.util.List; import model.Itree; import org.eclipse.jface.viewers.IStructuredContentProvider; import org.eclipse.jface.viewers.ITreeContentProvider; import org.eclipse.jface.viewers.Viewer; public class TreeContentProvider implements IStructuredContentProvider, ITreeContentProvider { public Object[] getElements(Object inputElement) { if (inputElement instanceof List){ List input = (List)inputElement; return input.toArray(); } return new Object[0]; } public Object[] getChildren(Object parentElement) { Itree node = (Itree)parentElement; List list = node.getChildren(); if(list == null){ return new Object[0]; } return list.toArray(); } public boolean hasChildren(Object element) { Itree node = (Itree)element; List list = node.getChildren(); return !(list == null || list.isEmpty()); } //以下三个函数根据需要填充 public Object getParent(Object element) { return null; } public void inputChanged(Viewer viewer, Object oldInput, Object newInput) { } public void dispose() { } }
2，标签器：
import model.Itree; import org.eclipse.jface.viewers.ILabelProvider; import org.eclipse.jface.viewers.LabelProvider; import org.eclipse.swt.graphics.Image; public class TreeLabelProvider extends LabelProvider implements ILabelProvider { public String getText(Object element) { Itree node = (Itree)element; return node.getName(); } public Image getImage(Object element) { return null; } }
三、好了，准备工作做好了，把上边的内容利用起来就好了。
import model.Factory; import org.eclipse.jface.viewers.TreeViewer; import org.eclipse.swt.SWT; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Tree; public class TestTreeViewer { private static Tree tree; 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 TreeViewer treeViewer = new TreeViewer(shell, SWT.BORDER|SWT.H_SCROLL); tree = treeViewer.getTree(); tree.setBounds(83, 75, 264, 185); treeViewer.setLabelProvider(new TreeLabelProvider()); treeViewer.setContentProvider(new TreeContentProvider()); treeViewer.setInput(Factory.createTree()); shell.open(); shell.setLayout(new FillLayout()); shell.layout(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } } }
看看是不是已经实现了treeViewer 四、上边是简单的treeViewer，如果我们需要带checkbox的treeViewer，简单，只需要更改
final
TreeViewer treeViewer
=
new
TreeViewer(shell, SWT.BORDER
|
SWT.H_SCROLL);
final
ContainerCheckedTreeViewer treeViewer
=
new
ContainerCheckedTreeViewer(shell, SWT.BORDER
|
SWT.H_SCROLL);