java align=left> 工作台窗口的Editor区域默认是显示的，而且它支持拖拽操作。
在Eclipse里面，把一个文件拖到Editor区域，就会自动打开该文件的Editor.该特性是在IWorkbenchWindowConfigurer 中设置。
在Password Gate中，当拖动Password Gate View中的一个Group 或者 Service到Editor区域，会在Editor显示该项的属性。
要实现此特性，有四部分是必须的。
1 实现必要的Transfer类型，而且定义Editor要支持哪些类型。在Password Gate中，Transfer是LocalSelectionTransfer.Transfer用来进行数据的序列化，它可以支持在同一个程序，或不同程序间拖拽。
2 因为在拖拽传递的过程中Editor Input 要实现序列化，所以要实现IPersistableElement接口。
3 加入一个释放适配器，当一个元素被扔到Editor区域，它可以知道如何进行操作，其实就是打开该元素的Editor.
4 使Password View能够进行拖操作，它要提供供拖的元素。
下面进行代码实现。
在RCP的WorkbenchWindowAdvisor. preWindowOpen中定义要求Editor Area支持的拖入对象的类型，以及打开相应Editor的事件。
ApplicationWorkbenchWindowAdvisor.preWindowOpen（）
01 public void preWindowOpen() {
02 ......
03 configurer.addEditorAreaTransfer(LocalSelectionTransfer.getInstance());
04 configurer.configureEditorAreaDropListener(new EditorAreaDropAdapter(
05 configurer.getWindow()));
06 } |
MILY: Arial; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">
Row 03定义了Editor Area支持的Transfer为LocalSelectionTransfer， LocalSelectionTransfer为自己实现的传输介质类。Row 04定义了对拖入Editor Area的对象的处理方法。EditorAreaDropAdapter实现了DropTargetListener接口，用来监听Editor Area中的Drop事件，它会打开拖入Editor Area的对象所对应的Editor，如果同时拖入多个对象，它会打开每个对象对应的Editor.
|
EditorAreaDropAdapter.java |
01 public class EditorAreaDropAdapter extends DropTargetAdapter {
02 private IWorkbenchWindow window;
03
04 public EditorAreaDropAdapter(IWorkbenchWindow window) {
05 this.window = window;
06 }
07
08 public void dragEnter(DropTargetEvent event) {
09 // always indicate a copy
10 event.detail = DND.DROP_COPY;
11 }
12
13 public void dragOperationChanged(DropTargetEvent event) {
14 // always indicate a copy
15 event.detail = DND.DROP_COPY;
16 }
17
18 public void drop(final DropTargetEvent event) {
19 Display d = window.getShell().getDisplay();
20 final IWorkbenchPage page = window.getActivePage();
21 if (page != null) {
22 d.asyncExec(new Runnable() {
23 public void run() {
24 asyncDrop(event, page);
25 }
26 });
27 }
28 }
29
30 private void asyncDrop(DropTargetEvent event, IWorkbenchPage page) {
31 if (LocalSelectionTransfer.getInstance().isSupportedType(
32 event.currentDataType)) {
33 StructuredSelection selection = (StructuredSelection) event.data;
34 for (Iterator iter = selection.iterator(); iter.hasNext();) {
35 Object o = iter.next();
36 if (o instanceof Record) {
37 IEditorInput input = new RecordEditorInput((Record) o);
38 try {
39 page.openEditor(input, RecordEditor.ID);
40 } catch (Exception e) {
41 PwdgatePlugin.log("open ediotr RecordEditor", e);
42 }
43 } else if (o instanceof Group) {
44 IEditorInput input = new GroupEditorInput((Group) o);
45 try {
46 page.openEditor(input, GroupEditor.ID);
47 } catch (PartInitException e) {
48 PwdgatePlugin.log("open ediotr GroupEditor", e);
49 }
50 }
51 }
52 }
53 }
54 } |
Row 18，用来处理Drop事件，Row 30的asyncDrop（）方法用来打来相应对象的Editor.
现在Editor Area已经可以接收拖入对象了。下一步要使一个View支持拖出对象的功能。下面的例子是在Pass Gate View中的createPartControl（）方法中为一个TreeViewer添加拖出功能。
|
PassGateView.java |
01 private void initDragAndDrop() {
02 Transfer[] transfer = new Transfer[] { LocalSelectionTransfer
03 .getInstance() };
04 LocalSelectionDragAdapter adapter = new LocalSelectionDragAdapter(
05 viewer);
06 viewer.addDragSupport(DND.DROP_MOVE | DND.DROP_COPY, transfer, adapter);
07
08 LocalSelectionDropAdapter dropAdapter = new LocalSelectionDropAdapter(
09 viewer);
10 viewer.addDropSupport(DND.DROP_MOVE | DND.DROP_COPY, transfer,
11 dropAdapter);
12 } |
Row 06 为TreeViewer添加了监听拖动的事件，当在TreeViewer中有拖动时，LocalSelectionDragAdapter把拖动的对象放入LocalSelectionTransfer中，通过其传到 Editor Area中。
|
LocalSelectionDragAdapter.java |
01 public class LocalSelectionDragAdapter extends DragSourceAdapter {
02
03 ISelectionProvider selectionProvider;
04
05 public LocalSelectionDragAdapter(ISelectionProvider provider) {
06 selectionProvider = provider;
07 }
08
09 public void dragFinished(DragSourceEvent event) {
10 // TODO Auto-generated method stub
11 super.dragFinished(event);
12 System.out
13 .println("DragSourceListener.dragFinished(DragSourceEvent event)");
14 }
15
16 public void dragSetData(DragSourceEvent event) {
17 System.out
18 .println("DragSourceListener.dragSetData(DragSourceEvent event)");
19 DragSource dragSource = (DragSource) event.widget;
20 Control control = dragSource.getControl();
21 if (control != control.getDisplay().getFocusControl()) {
22 event.doit = false;
23 return;
24 }
25
26 IStructuredSelection selection = (IStructuredSelection) selectionProvider
27 .getSelection();
28
29 if (selection.isEmpty()) {
30 event.doit = false;
31 return;
32 }
33 LocalSelectionTransfer.getInstance().setSelection(selection);
34 event.doit = true;
35 }
36
37 public void dragStart(DragSourceEvent event) {
38 System.out
39 .println("DragSourceListener.dragStart(DragSourceEvent event)");
40 }
41 } |
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