如何將控件從一個TabItem拖放到SWT中的另一個TabItem中

Question

我想在SWT中使用DND（拖放）。它似乎工作正常TreeView。我想從一個TabItem拖放一個控件（現在的標籤）到一個TabFolder中的另一個TabItem。

這裏我創建了一個TabFolder中和兩個的TabItems和使用setControl定義什麼是每個TabItem的

class DNDTab { 

    TabFolder tabFolder = new TabFolder(composite, SWT.NONE); 
    tabFolder.setLayoutData(new GridData(SWT.FILL,GridData.FILL, true, true)); 

    tabItem = new TabItem(tabFolder, SWT.NONE); 
    tabItem.setText("Favorite"); 
    tabItem.setControl(new CompositeFav(tabFolder)); 

    tabItem = new TabItem(tabFolder, SWT.NONE); 
    tabItem.setText("Verified"); 
    tabItem.setControl(new CompositeVerified(tabFolder)); 
} 

這裏面的驗證TabItem的定義

class CompositeVerified extends Composite { 
    CompositeVerified(Composite parent) { 
     super(parent, SWT.NONE); 
     GridLayout layout = new GridLayout(1, false); 
     setLayout(layout); 

     String[] testList = {"My TestCase 1", "My TestCase 2", 
       "My TestCase 3", "My  TestCase 4", "My TestCase 5"}; 

     for (int i = 0; i < 5; i++) { 
      final Label dragLabel = new Label(this, SWT.NONE); 
      dragLabel.setText(testList[i]); 
      creatingDragSource(dragLabel); 

      /*** createDragSource is my defined function where each label within the TabItem 
      * is made as a drag source using "DragSource source = new DragSource(dragLabel, operations);" 
      ***/ 
     } 

    } 
} 

這裏收藏的TabItem被製成降目標

class CompositeFav extends Composite { 
    CompositeFav(final Composite parent) { 
     super(parent, SWT.NONE); 

     DropTarget target = new DropTarget(parent, operations); 
     target.setTransfer(types); 

     target.addDropListener(new DropTargetListener() { 
      /*** The part of the code where dragEnter, dragOver, drop events are added***/ 
     } 
    } 
} 

拖動源創建正常，拖動似乎工作。但是當我將它放入Fav TabItem中時，它不會被添加到那裏。

Answer 1

的TabFolder中捕捉的DropTargetEvent第一... 醜陋的黑客：

• 創建的DropTarget的TabFolder中
• 前進的DropTargetEvent到目標複合

像這樣：

DropTarget target = new DropTarget(tabFolder, DND.DROP_MOVE | DND.DROP_COPY | DND.DROP_DEFAULT); 
     target.setTransfer(transfers); 
     target.addDropListener(new DropTargetAdapter() { 
      public void dragOver(DropTargetEvent event) {} 

      public void dragEnter(DropTargetEvent event){} 

      public void dragLeave(DropTargetEvent event){} 

      public void drop(DropTargetEvent event) { 
       DropTarget target = targetComposite.getData(DND.DROP_TARGET_KEY); 
       target.getDropListeners()[0].drop(event); 
      } 
     });