swing - 斯卡拉 Swing 中的树

Question

我想在我的 Scala 摆动应用程序中使用一棵树，但该组件在 API 中不可用。

是否包装了 JTree存在吗？

如果没有，你对制作有什么建议吗？

谢谢

Answer 1

即使您可以在 Scala 程序中直接使用 Java JTree，如 this thread 所示。 ，存在关于包含 JTree 的 Scala 包装器的争论。

The following common usages are tedious, verbose, non-type safe, and/or require unsafe null usage:

• Creating a custom tree model, backed by your own user objects -- the Scala Swing way would be to have a standard typesafe Map behind it
• Events - there are heaps of events created by trees -- TreeWillExpandListeners, TreeSelection, etc -- Using the Reactor/Publisher PartialFunction model would make this code far more readable and concise.
• Editable components -- This is done with implicit values elsewhere in scala.swing, and should be here too.
• Custom renderers -- Can't remember how Scala deals with these, but this is always fiddly in Java Swing too.

Bottom line is, JTrees are a massive pain to use in Java, for no particularly good reason. A Scala wrapper would be a massive boon for Scala Swing users.

design is in progress , 和 JTree wrapper proposal is available in this GitHub repo , 制作人 kenbot (Ken Scambler) .