java - JXTreeTable 结合 TreeCellRender 和 selectedBackground 与 ColorHighlighter

Question

我正在尝试将自定义 selectionBackground 设置为 JXTreeTable 中的行。如果我没有设置自定义 TreeCellRenderer，这会起作用。如果我像在我的示例中那样另外设置它，则节点文本的 selectionBackground 是默认的。任何想法如何将节点文本的背景设置为自定义背景？

import java.awt.Color;

import javax.swing.Icon;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.UIManager;

import org.jdesktop.swingx.JXTreeTable;
import org.jdesktop.swingx.decorator.ColorHighlighter;
import org.jdesktop.swingx.decorator.HighlightPredicate;
import org.jdesktop.swingx.renderer.DefaultTreeRenderer;
import org.jdesktop.swingx.renderer.IconValue;
import org.jdesktop.swingx.treetable.DefaultMutableTreeTableNode;
import org.jdesktop.swingx.treetable.DefaultTreeTableModel;

public class TestHighlighter {

    public static void main(String[] args) {
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JScrollPane scrollPane = new JScrollPane();
        frame.setContentPane(scrollPane);

        JXTreeTable treeTable = new JXTreeTable(new DefaultTreeTableModel(new DefaultMutableTreeTableNode("Test")));
        treeTable.setRootVisible(true);
        scrollPane.setViewportView(treeTable);

        DefaultTreeRenderer treeCellRenderer = new DefaultTreeRenderer(new IconValue() {
            @Override
            public Icon getIcon(Object value) {
                return UIManager.getIcon("FileView.directoryIcon");
            }
        });
        //Comment out next line and background is like set in Highlighter
        treeTable.setTreeCellRenderer(treeCellRenderer);

        treeTable.addHighlighter(new ColorHighlighter(HighlightPredicate.ALWAYS, null, null, Color.RED, null));

        frame.pack();
        frame.setVisible(true);
    }
}

我还尝试使用 IconHighlighter(避免使用自定义 TreeCellRenderer)来更改节点的图标，但图标没有更改。

treeTable.addHighlighter(new IconHighlighter(HighlightPredicate.ALWAYS, UIManager.getIcon("FileView.directoryIcon")));

Answer 1

[...]the problem is, that I want to have different selectionBackgrounds dependent of the node. [...] I thought there is maybe a more elegant way by using the swingx-renderer.

您当然可以使用 SwingX 渲染器(又名:DefaultTreeRenderer)并覆盖 getCellRendererComponent(...)为了根据需要根据节点设置背景颜色。例如:

IconValue iconValue = new IconValue() {
    @Override
    public Icon getIcon(Object value) {
        return UIManager.getIcon("FileView.directoryIcon");
    }
};

DefaultTreeRenderer treeCellRenderer = new DefaultTreeRenderer(iconValue) {
    @Override
    public Component getTreeCellRendererComponent(JTree tree, Object value, boolean selected, boolean expanded, boolean leaf, int row, boolean hasFocus) {
        Component c = super.getTreeCellRendererComponent(tree, value, selected, expanded, leaf, row, hasFocus);
        if (selected && leaf) {
            c.setBackground(Color.RED);
        } else {
            setBackground(tree.getBackground());
        }
        return c;
    }
};

在此代码段中，如果选择了叶节点(既不是根节点也不是父节点)，那么标签的背景颜色将为红色。否则标签的背景颜色将是默认的。