我在选项卡中对树项目的拖放支持存在问题,下面的简单代码在 Windows XP/7、Ubuntu、Fedora 和 RedHat 4 上运行良好,但在 RedHat 5 上失败。
@Override
protected Control createDialogArea(Composite parent) {
Composite composite = (Composite) super.createDialogArea(parent);
setShellStyle(getShellStyle() | SWT.RESIZE);
TabFolder tabFolder = new TabFolder(composite, SWT.NONE);
tabFolder.setLayoutData(new GridData(GridData.FILL_BOTH));
TabItem tab = new TabItem(tabFolder, SWT.NONE);
tab.setText("TabName");
/*
* TabItem 1 Content:
*/
TreeViewer tree = new TreeViewer(tabFolder, SWT.SINGLE|SWT.BORDER);
tree.setLabelProvider(provider);
tree.setContentProvider(provider);
tree.getTree().setHeaderVisible(true);
tree.getTree().setLayoutData(new GridData(GridData.FILL_BOTH));
TreeColumn tc = new TreeColumn(tree.getTree(), SWT.NONE, 0);
tc.setText("Name");
tc.setWidth(100);
tab.setControl(tree.getTree());
tree.setInput(provider.getInput());
/*
* Drag&Drop Support
*/
Transfer[] transfers = new Transfer[] { TextTransfer.getInstance()};
DragDropItemsSupport dndItemsListener = new DragDropItemsSupport(tree);
tree.addDragSupport(DND.DROP_MOVE, transfers, dndItemsListener);
tree.addDropSupport(DND.DROP_MOVE, transfers, dndItemsListener);
return composite;
}
当我说“效果很好”时,我可以通过提到的主机上的 ViewerDropAdapter 的方法 dragOver 。
@Override
public void dragOver(DropTargetEvent event) {
if (event.item != null)
System.out.println("Drag over : " + ((TreeItem)event.item).getText());
}
有人有解释、调查方法或解决方案吗:)?