前几篇讲过SWT的使用，但是SWT是基本的小控件，只能针对使用简单的数据类型，比如字符串，数字等等。但是遇到了复杂的类，该怎么办呢？
不要担心！这里就可以使用JFace了，它是对SWT的封装，可以应用于复杂的数据类型。
下面的介绍中有时候说控件，有时候说视图，原因就是这个JFace通常用于某个视图中，但是它其实就是一个复杂的组合控件而已，只不过需要我们额外的去设定内容与复杂类的内容匹配。因此如果想使用复杂的数据类型，必然要与JFace提供的控件进行兼容，就涉及到两个主要的函数：setContentProvider() 以及 setLabelProvider()。这两个函数下面会进行详细的介绍：
setContentProvider() 内容提供者
这个函数为JFace的控件提供内容，总的来说一共有一下几种：
ListViewer列表视图 TabelViewer表格视图 TreeViewer树形视图 TextViewer文本视图
除了最后一种比较特殊，不需压指定内容提供者，其他的三个JFace视图都需要设置内容提供者，以便设定关联的内容。
setLabelProvider()标签提供者
这个函数设置了标签提供者，用于JFace的控件视图现实内容，一般来说都有两个函数：
getColumnImage()和getColumnText()，一个用于设定标签上现实的图片，一个用于设定现实的内容
那么下面就看一下不同的JFace视图，这两个函数使用的差异。
ListViewer
这个列表视图，属于最简单的视图了，这里我们创建一个复杂点的元素
代码语言：javascript复制 1 class Person{
2 private int id;
3 private String name;
4 private int age;
5 private String address;
6 public int getId() {
7 return id;
8 }
9 public void setId(int id) {
10 this.id = id;
11 }
12 public String getName() {
13 return name;
14 }
15 public void setName(String name) {
16 this.name = name;
17 }
18 public int getAge() {
19 return age;
20 }
21 public void setAge(int age) {
22 this.age = age;
23 }
24 public String getAddress() {
25 return address;
26 }
27 public void setAddress(String address) {
28 this.address = address;
29 }
30 public String toString() {
31 return name;
32 }
33 }当我们从扩展点创建一个视图，并打开它的实现类时，插件为我们自动添加好了接口，里面有三个直接生成的函数
代码语言：javascript复制public class ListViewerTest extends ViewPart {
public ListViewerTest() {
}
public void createPartControl(Composite parent) {
}
public void setFocus() {
}
}此时，我们需要扩展createPartControl，在这里面创建一个view，并在其中添加 内容提供者函数，以及标签提供者函数。
代码语言：javascript复制viewer = new ListViewer(parent, SWT.SINGLE);
viewer.setContentProvider(new ViewContentProvider());
viewer.setLabelProvider(new ViewLabelProvider());
viewer.setSorter(new MySorter());
viewer.setInput(getSite());通常来说，都会有上面的五句话
第一行：创建了一个ListViewer的视图
第二行：设置它的内容提供者
第三行：设置它的标签提供者
第四行：设置排序规则
第五行：设置输入，这里面我们的输入由内容提供者提供，因此这里就直接设置参数为getSite()（可以理解为一个字符串，这个地方随便写都行，但是一定要有这个函数，空串都可以）就可以了。
下面看一下这几个函数的实现：
代码语言：javascript复制 class ViewContentProvider implements IStructuredContentProvider{
public Object[] getElements(Object inputElement) {
Person[] persons = new Person[3];
persons[0] = new Person();
persons[0].setId(001);
persons[0].setName("xingoo");
persons[0].setAge(25);
persons[0].setAddress("ChangChun");
persons[1] = new Person();
persons[1].setId(002);
persons[1].setName("halo");
persons[1].setAge(27);
persons[1].setAddress("ShenYang");
persons[2] = new Person();
persons[2].setId(003);
persons[2].setName("haha");
persons[2].setAge(25);
persons[2].setAddress("DaLian");
return persons;
}
public void dispose() {
}
public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
}
}
class ViewLabelProvider extends LabelProvider{
public Image getColumnImage(Object element) {
return null;
}
public String getColumnText(Object element) {
return getText(element);
}
}
class MySorter extends ViewerSorter{
public int compare(Viewer viewer,Object ob1,Object ob2){
return ((Person)ob1).getId() - ((Person)ob2).getId();
}
}对于内容提供者来说，最重要的一个方法就是getElements，因为视图上现实的数据，都要从这个方法获得。
下面看一下对应的全部代码
代码语言：javascript复制 1 package testpreference.views;
2
3 import org.eclipse.jface.viewers.DoubleClickEvent;
4 import org.eclipse.jface.viewers.IDoubleClickListener;
5 import org.eclipse.jface.viewers.ISelectionChangedListener;
6 import org.eclipse.jface.viewers.IStructuredContentProvider;
7 import org.eclipse.jface.viewers.IStructuredSelection;
8 import org.eclipse.jface.viewers.LabelProvider;
9 import org.eclipse.jface.viewers.ListViewer;
10 import org.eclipse.jface.viewers.SelectionChangedEvent;
11 import org.eclipse.jface.viewers.Viewer;
12 import org.eclipse.jface.viewers.ViewerSorter;
13 import org.eclipse.swt.SWT;
14 import org.eclipse.swt.graphics.Image;
15 import org.eclipse.swt.widgets.Composite;
16 import org.eclipse.ui.part.ViewPart;
17 class Person{
18 private int id;
19 private String name;
20 private int age;
21 private String address;
22 public int getId() {
23 return id;
24 }
25 public void setId(int id) {
26 this.id = id;
27 }
28 public String getName() {
29 return name;
30 }
31 public void setName(String name) {
32 this.name = name;
33 }
34 public int getAge() {
35 return age;
36 }
37 public void setAge(int age) {
38 this.age = age;
39 }
40 public String getAddress() {
41 return address;
42 }
43 public void setAddress(String address) {
44 this.address = address;
45 }
46 public String toString() {
47 return name;
48 }
49 }
50
51
52 public class ListViewerTest extends ViewPart {
53 public static final String ID = "testpreference.views.ListViewerTest";
54 private ListViewer viewer;
55
56 public ListViewerTest() {
57
58 }
59
60 public void createPartControl(Composite parent) {
61 viewer = new ListViewer(parent, SWT.SINGLE);
62 viewer.setContentProvider(new ViewContentProvider());
63 viewer.setLabelProvider(new ViewLabelProvider());
64 viewer.setSorter(new MySorter());
65 viewer.setInput(getSite());
66
67 viewer.addSelectionChangedListener( new ISelectionChangedListener() {
68 public void selectionChanged(SelectionChangedEvent event) {
69 IStructuredSelection selection = (IStructuredSelection)event.getSelection();
70 System.out.println("Now selecting " selection.getFirstElement().toString());
71 }
72 });
73
74 viewer.addDoubleClickListener( new IDoubleClickListener() {
75 public void doubleClick(DoubleClickEvent event) {
76 IStructuredSelection selection = (IStructuredSelection)event.getSelection();
77 System.out.println("Double clicking " selection.getFirstElement().toString());
78 }
79 });
80 }
81
82 public void setFocus() {
83
84 }
85 class ViewContentProvider implements IStructuredContentProvider{
86 public Object[] getElements(Object inputElement) {
87
88 Person[] persons = new Person[3];
89 persons[0] = new Person();
90 persons[0].setId(001);
91 persons[0].setName("xingoo");
92 persons[0].setAge(25);
93 persons[0].setAddress("ChangChun");
94
95 persons[1] = new Person();
96 persons[1].setId(002);
97 persons[1].setName("halo");
98 persons[1].setAge(27);
99 persons[1].setAddress("ShenYang");
100
101 persons[2] = new Person();
102 persons[2].setId(003);
103 persons[2].setName("haha");
104 persons[2].setAge(25);
105 persons[2].setAddress("DaLian");
106
107 return persons;
108 }
109 public void dispose() {
110 }
111 public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
112 }
113 }
114 class ViewLabelProvider extends LabelProvider{
115 public Image getColumnImage(Object element) {
116 return null;
117 }
118 public String getColumnText(Object element) {
119 return getText(element);
120 }
121 }
122 class MySorter extends ViewerSorter{
123 public int compare(Viewer viewer,Object ob1,Object ob2){
124 return ((Person)ob1).getId() - ((Person)ob2).getId();
125 }
126 }
127 }
tableViewer
这个对于上面的Listviewer来说，标签提供者方面复杂了一些
首先，创建视图时，需要定义Table的样式
代码语言：javascript复制 1 viewer = new TableViewer(parent,SWT.SINGLE|SWT.FULL_SELECTION);
2 Table table = viewer.getTable();
3 table.setHeaderVisible(true);
4 table.setLinesVisible(true);
5
6 String[] columnNames = new String[]{"id","name","age","address"};
7 int[] columnWidths = new int[]{100,100,100,100};
8 int[] columnAlignments = new int[]{SWT.LEFT,SWT.LEFT,SWT.LEFT,SWT.LEFT};
9 for(int i=0;i<columnNames.length;i ){
10 TableColumn tableColumn = new TableColumn(table,columnAlignments[i]);
11 tableColumn.setText(columnNames[i]);
12 tableColumn.setWidth(columnWidths[i]);
13 }
14
15 viewer.setContentProvider(new ViewContentProvider());
16 viewer.setLabelProvider(new ViewLabelProvider());
17 viewer.setSorter(new MySorter());
18 viewer.setInput(getSite());对于标签提供者函数来说，稍微麻烦一点，需要根据index指定每一列显示的内容
代码语言：javascript复制class ViewLabelProvider extends LabelProvider implements ITableLabelProvider{
public Image getColumnImage(Object element,int index) {
return null;
}
public String getColumnText(Object element,int index) {
Person person = (Person)element;
switch(index){
case 0:
return person.getId() "";
case 1:
return person.getName();
case 2:
return person.getAge() "";
case 3:
return person.getAddress();
default:
return "unknown" index;
}
}
}全部代码及运行结果
代码语言：javascript复制 1 package testpreference.views;
2
3 import org.eclipse.jface.viewers.IStructuredContentProvider;
4 import org.eclipse.jface.viewers.ITableLabelProvider;
5 import org.eclipse.jface.viewers.LabelProvider;
6 import org.eclipse.jface.viewers.TableViewer;
7 import org.eclipse.jface.viewers.Viewer;
8 import org.eclipse.jface.viewers.ViewerSorter;
9 import org.eclipse.swt.SWT;
10 import org.eclipse.swt.graphics.Image;
11 import org.eclipse.swt.widgets.Composite;
12 import org.eclipse.swt.widgets.Table;
13 import org.eclipse.swt.widgets.TableColumn;
14 import org.eclipse.ui.part.ViewPart;
15
16 public class TableViewerTest extends ViewPart {
17 public static final String ID = "testpreference.views.TableViewerTest";
18 private TableViewer viewer;
19 public TableViewerTest() {
20 // TODO Auto-generated constructor stub
21 }
22
23 public void createPartControl(Composite parent) {
24 viewer = new TableViewer(parent,SWT.SINGLE|SWT.FULL_SELECTION);
25 Table table = viewer.getTable();
26 table.setHeaderVisible(true);
27 table.setLinesVisible(true);
28
29 String[] columnNames = new String[]{"id","name","age","address"};
30 int[] columnWidths = new int[]{100,100,100,100};
31 int[] columnAlignments = new int[]{SWT.LEFT,SWT.LEFT,SWT.LEFT,SWT.LEFT};
32 for(int i=0;i<columnNames.length;i ){
33 TableColumn tableColumn = new TableColumn(table,columnAlignments[i]);
34 tableColumn.setText(columnNames[i]);
35 tableColumn.setWidth(columnWidths[i]);
36 }
37
38 viewer.setContentProvider(new ViewContentProvider());
39 viewer.setLabelProvider(new ViewLabelProvider());
40 viewer.setSorter(new MySorter());
41 viewer.setInput(getSite());
42 }
43
44 public void setFocus() {
45 // TODO Auto-generated method stub
46
47 }
48 class ViewContentProvider implements IStructuredContentProvider {
49 public Object[] getElements(Object inputElement) {
50
51 Person[] persons = new Person[3];
52 persons[0] = new Person();
53 persons[0].setId(001);
54 persons[0].setName("xingoo");
55 persons[0].setAge(25);
56 persons[0].setAddress("ChangChun");
57
58 persons[1] = new Person();
59 persons[1].setId(002);
60 persons[1].setName("halo");
61 persons[1].setAge(27);
62 persons[1].setAddress("ShenYang");
63
64 persons[2] = new Person();
65 persons[2].setId(003);
66 persons[2].setName("haha");
67 persons[2].setAge(25);
68 persons[2].setAddress("DaLian");
69
70 return persons;
71 }
72 public void dispose() {
73 }
74 public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
75 }
76 }
77 class ViewLabelProvider extends LabelProvider implements ITableLabelProvider{
78 public Image getColumnImage(Object element,int index) {
79 return null;
80 }
81 public String getColumnText(Object element,int index) {
82 Person person = (Person)element;
83 switch(index){
84 case 0:
85 return person.getId() "";
86 case 1:
87 return person.getName();
88 case 2:
89 return person.getAge() "";
90 case 3:
91 return person.getAddress();
92 default:
93 return "unknown" index;
94 }
95 }
96 }
97 class MySorter extends ViewerSorter{
98 public int compare(Viewer viewer,Object ob1,Object ob2){
99 return ((Person)ob1).getId() - ((Person)ob2).getId();
100 }
101 }
102
103 }
TreeViewer
这个视图相比前面的这个复杂在它的内容提供者函数，我们需要让他的ContentProvider函数继承ITreeContentProvider接口，需要实现下面几个方法：
getChildren();获取节点的孩子节点。
getParent();获取节点的父节点
hasChildren();判断是否有孩子节点
getElements();获取全部的节点
下面看一下示例的代码
代码语言：javascript复制 1 class ViewContentProvider extends ArrayContentProvider implements ITreeContentProvider{
2
3 public Object[] getChildren(Object parentElement) {
4 TreePerson person = (TreePerson)parentElement;
5 return person.getChildren().toArray();
6 }
7
8 public Object getParent(Object element) {
9 TreePerson person = (TreePerson)element;
10 return person.getParent();
11 }
12
13 public boolean hasChildren(Object element) {
14 TreePerson person = (TreePerson)element;
15 return person.getChildren().size()>0?true:false;
16 }
17
18 public Object[] getElements(Object inputElement) {
19 TreePerson[] persons = new TreePerson[3];
20 persons[0] = new TreePerson();
21 persons[0].setId(001);
22 persons[0].setName("xingoo");
23 persons[0].setAge(25);
24 persons[0].setAddress("ChangChun");
25
26 persons[1] = new TreePerson();
27 persons[1].setId(002);
28 persons[1].setName("halo");
29 persons[1].setAge(27);
30 persons[1].setAddress("ShenYang");
31
32 persons[2] = new TreePerson();
33 persons[2].setId(003);
34 persons[2].setName("haha");
35 persons[2].setAge(25);
36 persons[2].setAddress("DaLian");
37
38 persons[0].getChildren().add(persons[1]);
39 persons[0].getChildren().add(persons[2]);
40 persons[1].setParent(persons[0]);
41 persons[2].setParent(persons[0]);
42
43 return persons;
44 }
45
46 }而他的标签提供者跟ListViewer的差不多，仅仅需要提供一个简单的名称就可以了。
代码语言：javascript复制class ViewLabelProvider extends LabelProvider{
public Image getColumnImage(Object element) {
return null;
}
public String getColumnText(Object element) {
return ((TreePerson)element).toString();
}
}全部代码以及运行结果
代码语言：javascript复制 1 package testpreference.views;
2
3 import java.util.ArrayList;
4 import java.util.List;
5
6 import org.eclipse.jface.viewers.ArrayContentProvider;
7 import org.eclipse.jface.viewers.ITreeContentProvider;
8 import org.eclipse.jface.viewers.LabelProvider;
9 import org.eclipse.jface.viewers.TreeViewer;
10 import org.eclipse.jface.viewers.Viewer;
11 import org.eclipse.jface.viewers.ViewerSorter;
12 import org.eclipse.swt.SWT;
13 import org.eclipse.swt.graphics.Image;
14 import org.eclipse.swt.widgets.Composite;
15 import org.eclipse.ui.part.ViewPart;
16 class TreePerson{
17 private int id;
18 private String name;
19 private int age;
20 private String address;
21 private List<TreePerson> children;
22 private TreePerson parent = null;
23
24 public TreePerson() {
25 children = new ArrayList();
26 }
27 public List<TreePerson> getChildren() {
28 return children;
29 }
30 public void setChildren(List<TreePerson> children) {
31 this.children = children;
32 }
33 public TreePerson getParent() {
34 return parent;
35 }
36 public void setParent(TreePerson parent) {
37 this.parent = parent;
38 }
39 public int getId() {
40 return id;
41 }
42 public void setId(int id) {
43 this.id = id;
44 }
45 public String getName() {
46 return name;
47 }
48 public void setName(String name) {
49 this.name = name;
50 }
51 public int getAge() {
52 return age;
53 }
54 public void setAge(int age) {
55 this.age = age;
56 }
57 public String getAddress() {
58 return address;
59 }
60 public void setAddress(String address) {
61 this.address = address;
62 }
63 public String toString() {
64 return name;
65 }
66 }
67 public class TreeViewerTest extends ViewPart {
68 public static final String ID = "testpreference.views.TreeViewerTest";
69 private TreeViewer viewer;
70 public TreeViewerTest() {
71 // TODO Auto-generated constructor stub
72 }
73
74 public void createPartControl(Composite parent) {
75 viewer = new TreeViewer(parent,SWT.SINGLE);
76 viewer.setLabelProvider(new ViewLabelProvider());
77 viewer.setContentProvider(new ViewContentProvider());
78 viewer.setSorter(new MySorter());
79 viewer.setInput(getSite());
80 }
81
82 public void setFocus() {
83 // TODO Auto-generated method stub
84
85 }
86 class ViewContentProvider extends ArrayContentProvider implements ITreeContentProvider{
87
88 public Object[] getChildren(Object parentElement) {
89 TreePerson person = (TreePerson)parentElement;
90 return person.getChildren().toArray();
91 }
92
93 public Object getParent(Object element) {
94 TreePerson person = (TreePerson)element;
95 return person.getParent();
96 }
97
98 public boolean hasChildren(Object element) {
99 TreePerson person = (TreePerson)element;
100 return person.getChildren().size()>0?true:false;
101 }
102
103 public Object[] getElements(Object inputElement) {
104 TreePerson[] persons = new TreePerson[3];
105 persons[0] = new TreePerson();
106 persons[0].setId(001);
107 persons[0].setName("xingoo");
108 persons[0].setAge(25);
109 persons[0].setAddress("ChangChun");
110
111 persons[1] = new TreePerson();
112 persons[1].setId(002);
113 persons[1].setName("halo");
114 persons[1].setAge(27);
115 persons[1].setAddress("ShenYang");
116
117 persons[2] = new TreePerson();
118 persons[2].setId(003);
119 persons[2].setName("haha");
120 persons[2].setAge(25);
121 persons[2].setAddress("DaLian");
122
123 persons[0].getChildren().add(persons[1]);
124 persons[0].getChildren().add(persons[2]);
125 persons[1].setParent(persons[0]);
126 persons[2].setParent(persons[0]);
127
128 return persons;
129 }
130
131 }
132 class ViewLabelProvider extends LabelProvider{
133 public Image getColumnImage(Object element) {
134 return null;
135 }
136 public String getColumnText(Object element) {
137 return ((TreePerson)element).toString();
138 }
139 }
140 class MySorter extends ViewerSorter{
141 public int compare(Viewer viewer,Object ob1,Object ob2){
142 return ((TreePerson)ob1).getId() - ((TreePerson)ob2).getId();
143 }
144 }
145 }
TextViewer
这个前一篇的源码编辑器上有讲解过，是一种可以编辑的Text文本，它可以设定特定复杂的样式，这里就看一个简单的例子
代码语言：javascript复制 1 viewer = new TextViewer(parent,SWT.MULTI | SWT.V_SCROLL);
2 String str = "this is test n this is test";
3 Document document = new Document(str);
4 viewer.setDocument(document);
5
6 TextPresentation style = new TextPresentation();
7 style.addStyleRange(new StyleRange(0,12,null,null,SWT.BOLD));
8 viewer.changeTextPresentation(style, true);
9
10 viewer.setInput(getSite());全部代码以及运行结果
代码语言：javascript复制 1 package testpreference.views;
2
3 import org.eclipse.jface.text.Document;
4 import org.eclipse.jface.text.TextPresentation;
5 import org.eclipse.jface.text.TextViewer;
6 import org.eclipse.jface.viewers.TreeViewer;
7 import org.eclipse.swt.SWT;
8 import org.eclipse.swt.custom.StyleRange;
9 import org.eclipse.swt.graphics.Color;
10 import org.eclipse.swt.widgets.Composite;
11 import org.eclipse.ui.part.ViewPart;
12
13 import testpreference.views.TreeViewerTest.MySorter;
14 import testpreference.views.TreeViewerTest.ViewContentProvider;
15 import testpreference.views.TreeViewerTest.ViewLabelProvider;
16
17 public class TextViewerTest extends ViewPart {
18 public static final String ID = "testpreference.views.TreeViewerTest";
19 private TextViewer viewer;
20
21 public TextViewerTest() {
22 // TODO Auto-generated constructor stub
23 }
24
25 public void createPartControl(Composite parent) {
26 viewer = new TextViewer(parent,SWT.MULTI | SWT.V_SCROLL);
27 String str = "this is test n this is test";
28 Document document = new Document(str);
29 viewer.setDocument(document);
30
31 TextPresentation style = new TextPresentation();
32 style.addStyleRange(new StyleRange(0,12,null,null,SWT.BOLD));
33 viewer.changeTextPresentation(style, true);
34
35 viewer.setInput(getSite());
36 }
37
38 public void setFocus() {
39 // TODO Auto-generated method stub
40
41 }
42
43 }
