关于JFace带复选框的树

树的复选框用CheckboxTreeViewer实现.由于其子类ContainerCheckedTreeViewer在没有选择全部子节点时可以自动将父节点设置成灰选,所以实现树的复选框更多的是用ContainerCheckedTreeViewer.

TreeView4.java

 1 public class TreeViewer4 {
 2     public static void main(String[] args) {
 3         new TreeViewer4().open();
 4     }
 5
 6     public void open() {
 7         final Display display = new Display();
 8         final Shell shell = new Shell();
 9         shell.setSize(300, 300);
10         // -----------界面核心代码-------------------
11         shell.setLayout(new FillLayout());
12         // 用ContainerCheckedTreeViewer完全替换TreeViewer
13         ContainerCheckedTreeViewer tv = new ContainerCheckedTreeViewer(shell, SWT.BORDER);
14         tv.setUseHashlookup(true); // 加快查找速度
15
16         Tree tree = tv.getTree();
17         tree.setHeaderVisible(true);
18         TreeColumn column = new TreeColumn(tree, SWT.LEFT);
19         column.setText("名称");
20         column.setWidth(150);
21         column = new TreeColumn(tree, SWT.LEFT);
22         column.setText("子结点数");
23         column.setWidth(80);
24         column = new TreeColumn(tree, SWT.LEFT);
25         column.setText("性别");
26         column.setWidth(40);
27
28         tv.setContentProvider(new TreeViewerContentProvider());
29         tv.setLabelProvider(new MyTableLableProvider());
30         // 和TableViewer一样，数据的入口也是setInput方法
31         List<Country> input = (List)DataFactory.createTreeData();
32         tv.setInput(input);
33         MyActionGroup2 actionGroup = new MyActionGroup2(tv);// 改用另一个ActionGroup
34         actionGroup.fillContextMenu(new MenuManager());// 将按钮注入到菜单对象中
35         // -----------END------------------
36         shell.open();
37         while (!shell.isDisposed()) {
38             if (!display.readAndDispatch())
39                 display.sleep();
40         }
41         display.dispose();
42     }
43 }

MyActionGroup2.java

 1 public class MyActionGroup2 extends ActionGroup {
 2     private ContainerCheckedTreeViewer tv;
 3
 4     public MyActionGroup2(ContainerCheckedTreeViewer tv) {
 5         this.tv = tv;
 6     }
 7
 8     public void fillContextMenu(IMenuManager mgr) {
 9         MenuManager menuManager = (MenuManager) mgr;
10         menuManager.add(new SelectAllAction());
11         menuManager.add(new RemoveEntryAction());
12         Tree tree = tv.getTree();
13         Menu menu = menuManager.createContextMenu(tree);
14         tree.setMenu(menu);
15     }
16
17     private class SelectAllAction extends Action {
18         public SelectAllAction() {
19             setText("勾选当前结点的所有子结点");
20         }
21
22         public void run() {
23             IStructuredSelection selection = (IStructuredSelection) tv.getSelection();
24             ITreeEntry entry = (ITreeEntry) (selection.getFirstElement());
25             tv.setSubtreeChecked(entry, true); // false不勾选
26         }
27     }
28
29     // 删除结点的Action类
30     private class RemoveEntryAction extends Action {
31         public RemoveEntryAction() {
32             setText("删除");
33         }
34
35         public void run() {
36             Object[] checks = tv.getCheckedElements();// 取得被勾选的结点（包括灰选）
37             if (checks.length == 0) {
38                 MessageDialog.openInformation(null, "提示", "请先勾选记录");
39                 return;
40             }
41             List<ITreeEntry> inputList = (List<ITreeEntry>) tv.getInput();
42             for (Object object : checks) {
43                 if (tv.getGrayed(object))
44                     continue;// 灰选结点不删除
45                 ITreeEntry entry = (ITreeEntry) object;
46                 remove(inputList, entry);
47                 tv.remove(entry);
48             }
49         }
50
51         private void remove(List<ITreeEntry> list, ITreeEntry entry) {
52             if (list == null)
53                 return;
54             for (Iterator it = list.iterator(); it.hasNext();) {
55                 ITreeEntry o = (ITreeEntry) it.next();
56                 if (o.getName().equals(entry.getName())) {
57                     it.remove();
58                     return;
59                 } else {
60                     remove(o.getChildren(), entry);
61                 }
62             }
63         }
64     }
65 }