Nimbus優先于手動定義的渲染器？

奇怪的是，如果我選擇一個單元格，整行都會得到正確的背景，包括布爾單元格：

我發現的最后一條相關資訊是，在 setBackground() 方法的 javadoc 中：It is up to the look and feel to honor this property, some may choose to ignore it.這讓我懷疑這甚至可以在沒有將 Nimbus 換成其他東西的情況下作業。

我的結論：無論我將渲染指令放在哪里，我都只能設法更改不在交替行之一上的布林值的背景，除非選擇了該行。

問題：我是否錯過了一些明顯的主要配置步驟？或者也許有辦法禁用 Nimbus 的表格交替行顏色？或者，這是某種已知問題嗎？

（更多的答案： 這不相關； 這不起作用；）

編輯：添加了 SSCCE，盡管從 IDE 制作的 GUI 代碼遠非短。

package tabletest;

import java.awt.Color;
import java.awt.Component;
import javax.swing.JTable;
import javax.swing.table.TableCellRenderer;

public class NewJFrame extends javax.swing.JFrame {
    public NewJFrame() {
        initComponents();
        
        // attempt #1        
        /*
        jTable1.setDefaultRenderer(Boolean.class, new MyTableRenderer(jTable1.getDefaultRenderer(Boolean.class)));;
        jTable1.setDefaultRenderer(String.class, new MyTableRenderer(jTable1.getDefaultRenderer(String.class)));;
        */
    }

    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        jScrollPane1 = new javax.swing.JScrollPane();
        jTable1 = new javax.swing.JTable() {
            //attempt #2
            @Override
            public Component prepareRenderer(TableCellRenderer renderer, int row, int column) {
                Component c = super.prepareRenderer(renderer, row, column);
                //((JComponent)c).setOpaque(true);
                c.setBackground(Color.red);
                return c;
            }
        }
        ;

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jTable1.setModel(new javax.swing.table.DefaultTableModel(
            new Object [][] {
                { new Boolean(true),  new Integer(1),  new Float(0.1), "asd"},
                { new Boolean(true),  new Integer(2),  new Float(0.2), "lol"},
                {null,  new Integer(3),  new Float(0.3), "xd"},
                {null,  new Integer(4),  new Float(0.4), "ftw"},
                {null,  new Integer(5),  new Float(0.5), "wtf"}
            },
            new String [] {
                "bool", "int", "float", "string"
            }
        ) {
            Class[] types = new Class [] {
                java.lang.Boolean.class, java.lang.Integer.class, java.lang.Float.class, java.lang.String.class
            };

            public Class getColumnClass(int columnIndex) {
                return types [columnIndex];
            }
        });
        jScrollPane1.setViewportView(jTable1);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(59, 59, 59)
                .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(174, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(25, 25, 25)
                .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(100, Short.MAX_VALUE))
        );

        pack();
    }// </editor-fold>                        

    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new NewJFrame().setVisible(true);
            }
        });
    }
    
    //attempt #1
    class MyTableRenderer implements TableCellRenderer {
        private final TableCellRenderer renderer;

        public MyTableRenderer(TableCellRenderer renderer) {
            this.renderer = renderer;
        }
        
        @Override
        public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
            Component c = renderer.getTableCellRendererComponent(table, value, isSelected, hasFocus, row,  column);
            //c.setOpaque(true);
            c.setBackground(Color.red);
            return c;
        }
    }
    
    // Variables declaration - do not modify                     
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JTable jTable1;
    // End of variables declaration                   
}

uj5u.com熱心網友回復：

您在問題中寫道（關于您問題中的代碼）：

以下代碼嘗試為整個表格繪制背景

這就是我打算做的。但是，您還寫道：

我的目標是一次為一行設定背景

然后我嘗試了一種不同的方法——它仍然將整個背景涂成紅色，但我希望你能夠調整下面的代碼以滿足你的要求。

第一種方法

詳見此處：
https
://docs.oracle.com/javase/tutorial/uiswing/lookandfeel/color.html 和此處：
https ://docs.oracle.com/javase/tutorial/uiswing/lookandfeel/_nimbusDefaults.html

只需在 class 中設定適當的屬性，就UIManager可以實作[我認為是]您想要的結果，即使整個JTable背景變為紅色。JTable這適用于除顯示Boolean值的第一列之外的所有列。為此，我創建了一個自定義 [table] 單元格渲染器，基于Nimbus外觀使用的渲染器，即：

javax.swing.plaf.synth.SynthTableUI.SynthBooleanTableCellRenderer

這是該渲染器的代碼：

class BoolTableCellRenderer extends JCheckBox implements TableCellRenderer {
    private boolean isRowSelected;

    public BoolTableCellRenderer() {
        setHorizontalAlignment(JLabel.CENTER);
        setName("Table.cellRenderer");
    }

    public Component getTableCellRendererComponent(JTable   table,
                                                   Object   value,
                                                   boolean  isSelected,
                                                   boolean  hasFocus,
                                                   int      row,
                                                   int      column) {
        isRowSelected = isSelected;
        if (isSelected) {
            setForeground(unwrap(table.getSelectionForeground()));
            setBackground(unwrap(Color.red));
        }
        else {
            setForeground(unwrap(table.getForeground()));
            setBackground(unwrap(Color.red));
        }
        setSelected((value != null && ((Boolean)value).booleanValue()));
        return this;
    }

    private Color unwrap(Color c) {
        if (c instanceof UIResource) {
            return new Color(c.getRGB());
        }
        return c;
    }

    public boolean isOpaque() {
        return true;
    }
}

我還寫了一個自定義TableModel。

class PrimitivesTableModel extends DefaultTableModel {

    public PrimitivesTableModel(Object[][] data, Object[] columnNames) {
        super(data, columnNames);
    }

    public Class<?> getColumnClass(int columnIndex) {
        Class<?> columnClass;
        switch (columnIndex) {
            case 0:
                columnClass = Boolean.class;
                break;
            case 1:
                columnClass = Integer.class;
                break;
            case 2:
                columnClass = Float.class;
                break;
            case 3:
                columnClass = String.class;
                break;
            default:
                columnClass = Object.class;
        }
        return columnClass;
    }
}

這是第一種方法的代碼：

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class NewsFram {

    private void buildAndDisplayGui() {
        JFrame frame = new JFrame("NewsFram");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(createTable(), BorderLayout.CENTER);
        frame.pack();
        frame.setLocationByPlatform(true);
        frame.setVisible(true);
    }

    private JScrollPane createTable() {
        Object[][] data = new Object[][]{{Boolean.valueOf(true), Integer.valueOf(1), Float.valueOf(0.1f), "asd"},
                                         {Boolean.valueOf(true), Integer.valueOf(2), Float.valueOf(0.2f), "lol"},
                                         {null, Integer.valueOf(3), Float.valueOf(0.3f), "xd"},
                                         {null, Integer.valueOf(4), Float.valueOf(0.4f), "ftw"},
                                         {null, Integer.valueOf(5), Float.valueOf(0.5f), "wtf"}};
        String[] columnNames = new String[]{"bool", "int", "float", "string"};
        PrimitivesTableModel model = new PrimitivesTableModel(data, columnNames);
        JTable table = new JTable(model);
        table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
        table.setDefaultRenderer(Boolean.class, new BoolTableCellRenderer());
        JScrollPane scrollPane = new JScrollPane(table);
        return scrollPane;
    }

    public static void main(String[] args) {
        UIManager.put("Table:\"Table.cellRenderer\".background", Color.red);
        UIManager.put("Table.alternateRowColor", Color.red);
        for (UIManager.LookAndFeelInfo info : UIManager.getInstalledLookAndFeels()) {
            if ("Nimbus".equals(info.getName())) {
                try {
                    UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
                catch (ClassNotFoundException |
                       IllegalAccessException |
                       InstantiationException |
                       UnsupportedLookAndFeelException x) {
                    x.printStackTrace();
                }
            }
        }
        EventQueue.invokeLater(() -> new NewsFram().buildAndDisplayGui());
    }
}

第二種方法

這種方法不會修改UIManager默認值，而是覆寫方法prepareRenderer（在類中JTable）。請注意，此方法還使用與TableModel第一種方法相同的自定義渲染器。

我覆寫了方法prepareRenderer，而不是創建另一個基于NimbusJTable外觀使用的通用單元格渲染器的自定義渲染器，因為該渲染器比.SynthBooleanTableCellRenderer

這是第二種方法的代碼：

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.EventQueue;

import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.plaf.UIResource;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellRenderer;

public class NewFrame {

    private void buildAndDisplayGui() {
        JFrame frame = new JFrame("NewFrame");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(createTable(), BorderLayout.CENTER);
        frame.pack();
        frame.setLocationByPlatform(true);
        frame.setVisible(true);
    }

    private JScrollPane createTable() {
        Object[][] data = new Object[][]{{Boolean.valueOf(true), Integer.valueOf(1), Float.valueOf(0.1f), "asd"},
                                         {Boolean.valueOf(true), Integer.valueOf(2), Float.valueOf(0.2f), "lol"},
                                         {null, Integer.valueOf(3), Float.valueOf(0.3f), "xd"},
                                         {null, Integer.valueOf(4), Float.valueOf(0.4f), "ftw"},
                                         {null, Integer.valueOf(5), Float.valueOf(0.5f), "wtf"}};
        String[] columnNames = new String[]{"bool", "int", "float", "string"};
        PrimitivesTableModel model = new PrimitivesTableModel(data, columnNames);

        @SuppressWarnings("serial")
        JTable table = new JTable(model) {
            public Component prepareRenderer(TableCellRenderer renderer, int row, int column) {
                Object value = getValueAt(row, column);
                boolean isSelected = false;
                boolean hasFocus = false;

                // Only indicate the selection and focused cell if not printing
                if (!isPaintingForPrint()) {
                    isSelected = isCellSelected(row, column);
                    boolean rowIsLead = (selectionModel.getLeadSelectionIndex() == row);
                    boolean colIsLead = (columnModel.getSelectionModel().getLeadSelectionIndex() == column);
                    hasFocus = (rowIsLead && colIsLead) && isFocusOwner();
                }
                Component cmpt = renderer.getTableCellRendererComponent(this,
                                                                        value,
                                                                        isSelected,
                                                                        hasFocus,
                                                                        row,
                                                                        column);
                if (!(value instanceof Boolean)) {
                    cmpt.setBackground(Color.red);
                }
                return cmpt;
            }
        };

        table.setDefaultRenderer(Boolean.class, new BoolTableCellRenderer());
        table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
        JScrollPane scrollPane = new JScrollPane(table);
        return scrollPane;
    }

    public static void main(String[] args) {
        for (UIManager.LookAndFeelInfo info : UIManager.getInstalledLookAndFeels()) {
            if ("Nimbus".equals(info.getName())) {
                try {
                    UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
                catch (ClassNotFoundException |
                       IllegalAccessException |
                       InstantiationException |
                       UnsupportedLookAndFeelException x) {
                    x.printStackTrace();
                }
            }
        }
        EventQueue.invokeLater(() -> new NewFrame().buildAndDisplayGui());
    }
}

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