将滚动条添加到JList [英] Adding Scrollbar to JList

问题描述

我正在尝试向JList添加滚动条(它使用自定义数据模型).添加JScrollPane实际上是隐藏 JList，而不是添加滚动条.当我使用滚动条运行代码时，JList不可见，并且我也看不到数据.

I'm trying to add a scrollbar to a JList (which uses a custom data model). Adding a JScrollPane actually hides the JList, instead of adding a scrollbar. When I run the code with the scrollbar, the JList is not visible, and I cannot see the data.

playlistField = new JList(playlist); // playlist is a data model
playlistField.setLocation(32, 220-36);
playlistField.setSize(350,120);
playlistField.setVisible(true);
this.add(playlistField);

listScrollPane = new JScrollPane(playlistField, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);

注释listScrollPane = ...行使JList再次可见，并且按预期方式工作.

Commenting out the listScrollPane = ... line makes the JList visible again and it works as expected.

我想念什么?

推荐答案

您需要将滚动窗格添加到容器中，而不是列表中.

You need to add the scrollpane to the container, and not the list.

在您当前的示例中，通过将列表添加到滚动窗格中，它会将列表从其原始容器中删除，因为一个组件只能有一个父级.

In your current example, by adding the list in the scrollpane, it removes the list from its original container, since a component can have only one parent.

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