TreeCellRenderer:如何设置背景颜色？

Question

我编写了一个自定义的TreeCellRenderer来更改组件外观.一切正常,但setBackground没有效果.代码肯定是执行的,因为前景色总是正确地改变.由于所选项目以蓝色呈现并且取消选择白色项目(没有自己编写该代码),我认为我的更改被JTree覆盖.那么改变背景颜色的正确方法是什么？

这基本上是我的代码:

JTree tree = new JTree(); 
tree.setCellRenderer(new MyCellRenderer()); 

///////

public class MyCellRenderer extends DefaultTreeCellRenderer{

   @Override
   public Component getTreeCellRendererComponent(JTree tree, Object value,
        boolean isSelected, boolean expanded, boolean leaf, int row,
        boolean hasFocus) {

    JComponent c = (JComponent) super.getTreeCellRendererComponent(tree, value, isSelected, expanded, leaf, row, hasFocus);
      DefaultMutableTreeNode node = (DefaultMutableTreeNode) value; 
      MyData data = (MyData)node.getUserObject();   
      if(data.isX()){
          c.setForeground(Color.blue); 
          c.setBackground(Color.gray); 
      }
      return c; 
    }
}

Answer 1

尝试添加呼叫c.setOpaque(true).