如何在 JXTreeTable 的子节点设置字体和背景颜色

Question

我有一个简单的 Java swing 应用程序。所以我有一个带有 JXTreeTable 的 JPanel。我可以在这个 TreeTable 中插入带有子节点的 soma 行，这样就可以了。

现在如果我尝试运行我的应用程序，我可以看到：

这也没关系。所以，现在如果我尝试扩展一个或多个 NODE，我可以看到：

我想知道是否可以更改渲染（为 NODE 子节点设置另一个背景或其他字体颜色。

这是我用来创建 JXTreeTable 的代码。

private void createTable(List<Entrate> v,String tipoConto){
    tableCatEntrate = new CustomTreeTableEntrate(v,tipoConto);
    daiProprietaJTableCatEntrate();
    jscrollPaneCatEntrate.setViewportView(tableCatEntrate);
}

这是 CustomTreeTableEntralte 类：

public class CustomTreeTableEntrate extends JXTreeTable{

    public CustomTreeTableEntrate(List<Entrate> listaConti,String tipoConto){
        setTreeTableModel(new RandomTextTreeTableModel(listaConti,tipoConto));
        setRowSelectionAllowed(false);
        this.setDefaultRenderer(Object.class, new CustomTreeTableSpeseXCategoriaSpese());
    }
    class RandomTextTreeTableModel extends DefaultTreeTableModel {
        public final NumberFormat decimalFormatter2 = new DecimalFormat("#,##0.00");
        DefaultMutableTreeTableNode Root = null;
        final String[] ColName = {"","Acquisti/Vendite","Uscite","Entrate","Saldo"};
        //public LinkedHashMap<String, Entrate> mappaConti = new LinkedHashMap<String, Entrate>();
        String tipoConto;

        RandomTextTreeTableModel(List<Entrate>listaConti,String tipoConto) {
            Root = new DefaultMutableTreeTableNode();
            this.setRoot(Root);
            for (Entrate conti : listaConti) {
                DefaultMutableTreeTableNode node = new DefaultMutableTreeTableNode(conti);
                Root.add(node);
                if(conti.getListaContiFigli()!=null){
                    for (Entrate contoFiglio : conti.getListaContiFigli()) {
                        node.add(new DefaultMutableTreeTableNode(contoFiglio));
                        mappaConti.put(contoFiglio.getDescrizione(), contoFiglio);
                    }
                }
                contoTotale.setTotale(conti.getTotale()+contoTotale.getTotale());
                contoTotale.setTotalePubblico(conti.getTotalePubblico()+contoTotale.getTotalePubblico());
                contoTotale.setEntrate(conti.getEntrate()+contoTotale.getEntrate());
                contoTotale.setUscite(conti.getUscite()+contoTotale.getUscite());
            }

            DefaultMutableTreeTableNode node = new DefaultMutableTreeTableNode(contoTotale);
            Root.add(node);
        }

        @Override
        public Object getValueAt(Object arg0, int arg1) {
            try{
                if(arg1==0){
                    int numberElement = ((DefaultMutableTreeTableNode)arg0).getChildCount();
                    if(numberElement<=0)
                        return null;
                    //Conti c = (Conti)((DefaultMutableTreeTableNode)arg0).getChildAt(0).getUserObject();
                    return "";
                }
                Entrate c = (Entrate)((DefaultMutableTreeTableNode)arg0).getUserObject();
                if(c==null)
                    return null;
                if (arg1 == 0) {
                    return "";
                }else if (arg1 == 1) {
                    return c.getDescrizione();
                }else if (arg1 == 2) {
                    return decimalFormatter2.format(c.getUscite());
                }else if (arg1 == 3) {
                    return decimalFormatter2.format(c.getEntrate());
                }else if (arg1 == 4 && tipoConto!=null && tipoConto.equalsIgnoreCase(WFConst.TIPO_CONTO_DEFAULT_AMMINISTRAZIONE_PRIVATO)) {
                    return decimalFormatter2.format(c.getTotale());
                }else if (arg1 == 4 && tipoConto!=null && tipoConto.equalsIgnoreCase(WFConst.TIPO_CONTO_DEFAULT_AMMINISTRAZIONE_PUBBLICO)) {
                    return decimalFormatter2.format(c.getTotalePubblico());
                }
            }catch(Exception e){
                e.printStackTrace();
            }
            return arg0;
        }



    }

}

这是 TreeTableRenderer，我认为问题出在这个类中，因为如果我尝试执行 Debug，我无法进入 getTreeCellRendererComponent。

public class CustomTreeTableSpeseXCategoriaSpese extends JLabel implements TreeCellRenderer, TableCellRenderer {
    /**
     * 
     */
    DefaultTreeCellRenderer defaultRenderer = new DefaultTreeCellRenderer();
    private static final long serialVersionUID = 4842418316518803090L;
    private Font fontTotale = new Font("Verdana", Font.BOLD, 12);
    private Font fontNegativo = new Font("Verdana", Font.BOLD, 12);




    public Component getTableCellRendererComponent(JTable table, Object value, 
            boolean isSelected, boolean hasFocus, int row, int column) {
        setOpaque(true);



        if(column ==1){
            setHorizontalAlignment(SwingConstants.LEFT);
        }else{
            setHorizontalAlignment(SwingConstants.RIGHT);
        }

        if (row== table.getRowCount()-1) {
            setForeground(Color.BLACK);
            setBackground( Color.RED );
            setFont(fontTotale);
        }else if(row != table.getRowCount() && column !=4){
            setForeground( Color.BLACK );
            setBackground(new Color(200, 200, 200));
            setFont(UtilitySwing.getTableFont());
        }else if(row != table.getRowCount()-1 && column ==4){
            String valore = value.toString();
            if(valore.startsWith("-")){
                setForeground(Color.red);
                setFont(fontNegativo);
            }else{
                setForeground(Color.blue);
                setFont(fontNegativo);
            }
        }
        setText(value != null ? value.toString() : "<null>");
        return this;
    }



    @Override
    public Component getTreeCellRendererComponent(JTree tree, Object value,
            boolean selected, boolean expanded, boolean leaf, int row,
            boolean hasFocus) {
        setOpaque(true);

        if(expanded){
            setForeground(Color.PINK);
            setBackground( Color.PINK );
            setFont(fontTotale);
        }
        return this;
    }
} 

Answer 1

您已经在使用TreeCellRenderer，所以您已经很接近了。 您需要做的就是访问模型（类似于DefaultTreeModel）并使用getPathToRoot() 查看您在树中的深度并相应地更改渲染器。

一个例子：

DefaultTreeCellRenderer defaultTreeCellRenderer = new DefaultTreeCellRenderer() {
    @Override
    public Component getTreeCellRendererComponent(JTree tree, Object value,
                                                  boolean selected, boolean expanded, boolean leaf, int row,
                                                  boolean hasFocus) {
        setOpaque(true);

        DefaultTreeModel model = (DefaultTreeModel) tree.getModel();
        if (model.getPathToRoot((TreeNode) value).length > 2) {
            //Do your rendering goodness here
        } else if (expanded) {
            setForeground(Color.PINK);
            setBackground(Color.PINK);
            setFont(fontTotale);
        }
        return this;
    }
};

注意我做了一些假设，所以请根据您的需要更正。

1. 型号是DefaultTreeModel
2. 节点是TreeNode
3. 您只关心节点是否至少 3 层深

另外，请查看 JavaDoc 的此功能，以确保它是您需要的。