如何使某些JavaFX TreeView节点不可选择? [英] How to make certain JavaFX TreeView nodes non-selectable?

问题描述

我想使JavaFX TreeView中的文件夹"节点可扩展和折叠，但不可选择.

我找到了此讨论，并调查了EventFilter，但似乎没有与TreeView选择相对应的任何EventType都会更改.第二个建议是自定义选择模型，这听起来像是对我的深入了解.因此，我是否坚持允许选择事件触发我的侦听器，然后对其中的垃圾进行分类?

解决方案

有点hacky，但是我最终还是这样:

table.getSelectionModel().selectedItemProperty().addListener((observable, oldValue, newValue) -> {
    if (newValue != null && !newValue.isLeaf()) {
        Platform.runLater(() -> table.getSelectionModel().clearSelection());
    }
});

对我来说，单击非叶节点时只需清除选择就足够了.但是，重新选择oldValue参数并不难，但要知道这将再次触发更改事件(clearSelection调用也是如此，这就是为什么newValue != null检查是必需的). /p>

I would like to make the 'folder' nodes in my JavaFX TreeView expandable and collapsible but not selectable.

I found this discussion and looked into EventFilter, but there does not appear to be any EventType that corresponds with TreeView selection changes. The second suggestion, a custom selection model, sounds like a deep dive to me. So, am I stuck allowing the selection events to trigger my listener and then sort through the trash there?

解决方案

It's a bit hacky, but I ended up doing it like this:

table.getSelectionModel().selectedItemProperty().addListener((observable, oldValue, newValue) -> {
    if (newValue != null && !newValue.isLeaf()) {
        Platform.runLater(() -> table.getSelectionModel().clearSelection());
    }
});

For me it was enough to just clear the selection when clicking a non-leaf node. However, it shouldn't be to hard to just reselect the oldValue parameter, but be aware that this will fire a change event again (so does the clearSelection call, that's why the newValue != null check is necessary).

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