java - 如何为 JTree 上的各个节点设置自定义图标？

Question

我需要能够为 JTree 各个节点设置图标。例如，我有一个 JTree，我需要节点具有自定义图标来帮助表示它们的含义。

• ( Spanner 图标)设置
• (错误图标)调试
• (笑脸图标)有趣的东西

...

等等。我尝试了几种来源，其中一种有点工作，但它搞乱了树事件，所以没有雪茄。提前致谢。

根据某人的要求:

class Country {
    private String name;
    private String flagIcon;

    Country(String name, String flagIcon) {
        this.name = name;
        this.flagIcon = flagIcon;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getFlagIcon() {
        return flagIcon;
    }

    public void setFlagIcon(String flagIcon) {
        this.flagIcon = flagIcon;
    }
}

class CountryTreeCellRenderer implements TreeCellRenderer {
    private JLabel label;

    CountryTreeCellRenderer() {
        label = new JLabel();
    }

    public Component getTreeCellRendererComponent(JTree tree, Object value, boolean selected, boolean expanded, boolean leaf, int row, boolean hasFocus) {
        Object o = ((DefaultMutableTreeNode) value).getUserObject();
        if (o instanceof Country) {
            Country country = (Country) o;
            label.setIcon(new ImageIcon(country.getFlagIcon()));
            label.setText(country.getName());
        } else {
            label.setIcon(null);
            label.setText("" + value);
        }
        return label;
    }
}

然后在哪里初始化:

DefaultMutableTreeNode root = new DefaultMutableTreeNode("Countries");
    DefaultMutableTreeNode asia = new DefaultMutableTreeNode("General");
    Country[] countries = new Country[]{
            new Country("Properties", "src/biz/jabaar/lotus/sf/icons/page_white_edit.png"),
            new Country("Network", "src/biz/jabaar/lotus/sf/icons/drive_network.png"),
    };

    for (Country country : countries) {
        DefaultMutableTreeNode node = new DefaultMutableTreeNode(country);
        asia.add(node);
    }

这是可行的，只是我不想显示子根，只显示节点。此外，此代码还可以使该项目在单击时不会突出显示。

Answer 1

I don't want the sub-roots to show, just the nodes.

您的 getTreeCellRendererComponent() 实现应该会看到一个经过正确调节的boolean leaf 参数，您可以使用该参数，如图 here .

if (o instanceof Country && leaf) { ... }