在TreeView中设置选定的TreeItem [英] Set selected TreeItem in TreeView

问题描述

我有一个位于GridPane内的TreeView。某个功能要求用户选择TreeItem并单击屏幕上的按钮。完成与按钮关联的功能后，我希望焦点返回到先前在TreeView中选择的TreeItem。

I have a TreeView that is inside a GridPane. A certain function requires the user to select a TreeItem and click on button on the screen. After the function associated with the button is completed, I want the focus to go back to the TreeItem that was previously selected in the TreeView.

在按钮操作结束时，我有：

At the end of the button action, I have:

TreeItem< String> ; selectedItem = [上次选择的TreeItem]

如何使用 selectedItem将焦点重新放回TreeView 突出显示？

TreeView或TreeItem都没有我可以使用的 setSelected 方法。

Neither the TreeView or TreeItem have a setSelected method I can use.

推荐答案

选择项目：

TreeView treeView = ... ; // initialize this
TreeItem treeItem = ... ; // initialize this, too
MultipleSelectionModel msm = treeView.getSelectionModel();

// This line is the not-so-clearly documented magic.
int row = treeView.getRow( treeItem );

// Now the row can be selected.
msm.select( row );

即获取的行 treeItem 从其 treeView ，然后将行传递到 treeView 的选择模型。

That is, get the row of the treeItem from its treeView, then pass that row into the treeView's selection model.

除此之外，可以改进 TreeView API以委托单个树项：

Aside, the TreeView API could be improved to delegate for a single tree item:

treeView.select( treeItem );

不幸的是，不存在这样的方法。

Unfortunately, no such method exists.

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