TreeItem支持拖放吗？ [英] Is drag and drop supported by TreeItem?

问题描述

我正在使用JavaFx-2的 TreeView 代表文件系统。

I'm currently working with a JavaFx-2's TreeView representing a file system.

我想启用拖放允许移动操作，但它看起来像 TreeItem 不包括拖动事件侦听器。我只能在拖放的TreeView对象上实现拖放，但它不适用于子项目。

I want to enable drag and drop to allow move operations, but it looks like TreeItem doesn't include drag events listeners. I was only able to implement drag and drop on the englobing TreeView object, but it doesn't work for sub-items.

我错过了一些东西，尚未支持TreeItems的drop事件？

Am I missing something, or are drag and drop events not supported for TreeItems yet?

推荐答案

Csh在Oracle论坛上回答的问题： https://forums.oracle.com/forums/message.jspa?messageID=10426066#10426066

Question answered by Csh on the Oracle Forums : https://forums.oracle.com/forums/message.jspa?messageID=10426066#10426066

您必须在TreeCell上实施拖放。

You have to implement drag on drop on the TreeCell.

编写像这样的CellFactory：

Write a CellFactory like this:

TreeView<String> treeView = new TreeView<String>();
    treeView.setCellFactory(new Callback<TreeView<String>, TreeCell<String>>() {
        @Override
        public TreeCell<String> call(TreeView<String> stringTreeView) {
            TreeCell<String> treeCell = new TreeCell<String>() {
                protected void updateItem(String item, boolean empty) {
                    super.updateItem(item, empty);
                    if (item != null) {
                        setText(item);
                    }
                }
            };

            treeCell.setOnDragDetected(new EventHandler<MouseEvent>() {
                @Override
                public void handle(MouseEvent mouseEvent) {

                }
            });

            return treeCell;
        }
    });

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