我已经创建了一个 jface treeviewer，并且我正在将元素拖放到 treeviewer 中。所以应该将项目添加到树的子子项上。我怎样才能获得要删除元素的子子名。例如：
tree->
A->
1
2
B
C
因此，当我拖放 1 时，它应该将所选项目设为 1，我们该怎么做。
drop的代码如下
int operationsn = DND.DROP_COPY | DND.DROP_MOVE;
Transfer[] transferType = new Transfer[]{TestTransfer.getInstance()};
DropTarget targetts = new DropTarget(treeComposite, operationsn);
targetts.setTransfer(new Transfer[] { TestTransfer.getInstance() });
targetts.addDropListener(new DropTargetListener() {
public void dragEnter(DropTargetEvent event) {
System.out.println("dragEnter in target ");
if (event.detail == DND.DROP_DEFAULT) {
if ((event.operations & DND.DROP_COPY) != 0) {
event.detail = DND.DROP_COPY;
} else {
event.detail = DND.DROP_NONE;
}
}
}
public void dragOver(DropTargetEvent event) {
System.out.println("dragOver in target ");
event.feedback = DND.FEEDBACK_SELECT | DND.FEEDBACK_SCROLL;
}
public void dragOperationChanged(DropTargetEvent event) {
System.out.println("dragOperationChanged in target ");
if (event.detail == DND.DROP_DEFAULT) {
if ((event.operations & DND.DROP_COPY) != 0) {
event.detail = DND.DROP_COPY;
} else {
event.detail = DND.DROP_NONE;
}
}
}
public void dragLeave(DropTargetEvent event) {
System.out.println("dragLeave in target ");
}
public void dropAccept(DropTargetEvent event) {
System.out.println("dropAccept in target ");
}
public void drop(DropTargetEvent event) {
//if (textTransfer.isSupportedType(event.currentDataType))
if (event.data != null) {
Test tsType = (Test) event.data;
addItem(tsType);
System.out.println("test step name is" +tsType);
}
}
});
在 addItem 函数中，我编写了将项目添加到选定项目上的树查看器的代码。但是在删除项目时我无法选择项目，所以我们如何在将元素拖放到树中时选择项目。