根据节点中存储的数据突出显示jtree中的特定节点 [英] Highlighting specific nodes in a jtree depending on data stored in the node

问题描述

我有一个显示jTree的应用程序.树中的每个节点都有一个名为flagged的布尔字段，指示是否需要用户的注意.

I have an application that displays a jTree. Each node in the tree has a boolean field called flagged which indicates whether it requires attention or not from the user.

如果该字段为true，那么我希望将其突出显示为红色，否则不要突出显示.

If the field is true, then I would like it to be highlighted in red, otherwise no highlighting.

什么是完成此任务的好方法?我应该扩展DefaultTreeCellRenderer吗?实现我自己的自定义TreeCellRenderer?还有其他方法吗?

What is a good way to accomplish this? Should I extend DefaultTreeCellRenderer? Implement my own custom TreeCellRenderer? Some other method?

推荐答案

由于您要进行的自定义渲染非常简单，因此我将扩展DefaultTreeCellRenderer并覆盖其getTreeCellRendererComponent方法.您可以简单地在DefaultTreeCellRenderer使用的JLabel上调整前景色.这是一个简单的示例:

Since the custom rendering you want to do is pretty basic, I would just extend DefaultTreeCellRenderer and override its getTreeCellRendererComponent method. You could simply adjust the foreground color on the JLabel that the DefaultTreeCellRenderer uses. Here's a quick example:

tree.setCellRenderer(new DefaultTreeCellRenderer() {
  @Override
  public Component getTreeCellRendererComponent(JTree tree, Object value, boolean sel, boolean expanded,
                                                boolean leaf, int row, boolean hasFocus) {
    JLabel label = (JLabel)super.getTreeCellRendererComponent(tree, value, sel, expanded, leaf, row, hasFocus);
    YourNode node = (YourNode)value;
    if (node.isFlagged())
      label.setForeground(Color.RED);

    return label;
  }
});

结果:

这篇关于根据节点中存储的数据突出显示jtree中的特定节点的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！