删除JTree中的节点

Question

In my project i have a Jtree with custom node (which extends DefaultMutableTreeNode). 在我的项目中，我有一个带有自定义节点的Jtree（扩展了DefaultMutableTreeNode）。 Each node is associated with a boolean value. 每个节点都与一个布尔值相关联。 When the boolean is False i woul like to strike the texte of my node. 当布尔值为False时，我想敲击节点的texte。 So for example : 因此，例如：

node 1 节点1
- node1.1 node1.1
- ~~node1.2~~ ~~node1.2~~
node 2 节点2
- node2.1 node2.1
- ... ...

I tried to create a new Font but i don't find any properties to strike the text and i only managed to add my custom font to the whole tree and not node by node. 我试图创建一个新的字体，但是我没有找到任何属性来删除文本，我只设法将自定义字体添加到整个树中，而不是逐个节点地添加。

I think that i should use the TreeRenderer but i can't find any method to help me strike the node. 我认为我应该使用TreeRenderer，但是我找不到任何方法来帮助我击中该节点。

Does someone have an idea on i can do it ? 有人对我有想法吗？

Answer 1

Check out the example below. 查看以下示例。 For keeping it simple, I am just striking through the selected node. 为了简单起见，我仅介绍了所选节点。 You need to, of course, use your own check on the value. 当然，您需要对值使用自己的检查。

package snippet;

import java.awt.Component;
import java.awt.Font;
import java.awt.font.TextAttribute;
import java.util.Map;

import javax.swing.JFrame;
import javax.swing.JTree;
import javax.swing.SwingUtilities;
import javax.swing.tree.DefaultTreeCellRenderer;

public class JTreeTest extends JFrame {
    private final class StrikeoutCellRenderer extends DefaultTreeCellRenderer {
        private static final long serialVersionUID = 1L;

        @Override public Component getTreeCellRendererComponent(JTree tree, Object value, boolean sel, boolean expanded,
                boolean leaf, int row, boolean hasFocus) {
            Component c = super.getTreeCellRendererComponent(tree, value, sel, expanded, leaf, row, hasFocus);
            Font font = c.getFont();
            Map attributes = font.getAttributes();
            if(sel)
                attributes.put(TextAttribute.STRIKETHROUGH, TextAttribute.STRIKETHROUGH_ON);
            else
                attributes.remove(TextAttribute.STRIKETHROUGH);
            Font newFont = new Font(attributes);
            c.setFont(newFont);
            return c;
        }

    }

    private static final long serialVersionUID = 1L;

    public JTreeTest() {
        super(JTreeTest.class.getName());
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        initComponents();
    }

    private void initComponents() {
        JTree tree = new JTree();
        tree.setCellRenderer(new StrikeoutCellRenderer());
        add(tree);
        pack();
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override public void run() {
                JTreeTest t = new JTreeTest();
                t.setVisible(true);
            }
        });
    }
}

Note that even if the node doesn't need a strike through, you need to reset the attribute, since a single component is used for painting all the nodes. 请注意，即使节点不需要删除线，您也需要重置属性，因为单个组件用于绘制所有节点。

Answer 2

最简单的方法是定义一个渲染器（扩展DefaultTreeCellRenderer ），并调用setText()传递html字符串（例如“ <html><u>node1.2</u></html> ”）作为删除线的值。

删除JTree中的节点

问题描述

2 个解决方案

解决方案1
2 已采纳 2015-08-07 07:15:30

解决方案2
2 2015-08-07 07:16:20

删除JTree中的节点

问题描述

2 个解决方案

解决方案1 2 已采纳 2015-08-07 07:15:30

解决方案2 2 2015-08-07 07:16:20

解决方案1
2 已采纳 2015-08-07 07:15:30

解决方案2
2 2015-08-07 07:16:20