Java List set 列表项的背景 [英] Java List set Background of list item

问题描述

如何更改 Java AWT 列表项的背景颜色?我的意思是 AWT 列表中的单个项目，而不是整个项目.

How does one change the background color of a Java AWT List item? By that I mean a single item in a AWT List, not the whole thing.

推荐答案

您需要一个自定义渲染器.也就是说，如果您使用的是 Swing.最好坚持使用 Swing 组件而不是 awt gui 组件.

You'll need a custom renderer. That is, if you're using Swing. It's better to stick with the Swing components and not the awt gui components.

JList
...
setCellRenderer(new MyCellRenderer());
...
class MyCellRenderer extends DefaultListCellRenderer
{
  public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus)
  {
    super.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);
    Color bg = <calculated color based on value>;
    setBackground(bg);
    setOpaque(true); // otherwise, it's transparent
    return this;  // DefaultListCellRenderer derived from JLabel, DefaultListCellRenderer.getListCellRendererComponent returns this as well.
  }
}

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