如何使用Renderer for TableHeader

时间：2012-03-24 11:09:59

标签： java swing jtable tablecellrenderer jtableheader

即使我阅读并测试了@kleopatra的答案

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来自SSCCE 

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.*;

public class SelectedTableHeader {

    private JFrame frame = new JFrame("Table Demo");
    private JTableHeader header;
    private Object selectedColumn = null;
    private String[] columnNames = {"String", "Integer", "Float", "Double", "Locale & Double", "Boolean"};
    private Object[][] data = {
        {"aaa", new Integer(12), new Float(12.15), new Double(100.05), new Double(12.05), true},
        {"bbb", new Integer(5), new Float(7.154), new Double(6.1555), new Double(417.55), false},
        {"CCC", new Integer(92), new Float(0.1135), new Double(3.1455), new Double(11.05), true},
        {"ddd", new Integer(12), new Float(31.15), new Double(10.05), new Double(23.05), true},
        {"eee", new Integer(5), new Float(5.154), new Double(16.1555), new Double(17.55), false},
        {"fff", new Integer(92), new Float(4.1135), new Double(31.1455), new Double(3.05), true}};
    private TableModel model = new DefaultTableModel(data, columnNames) {

        private static final long serialVersionUID = 1L;

        @Override
        public Class<?> getColumnClass(int column) {
            return getValueAt(0, column).getClass();
        }
    };
    private JTable table = new JTable(model);

    public SelectedTableHeader() {
        header = table.getTableHeader();
        header.addMouseListener(new MouseAdapter() {

            @Override
            public void mouseClicked(MouseEvent e) {
                JTableHeader h = (JTableHeader) e.getSource();
                int i = h.columnAtPoint(e.getPoint());
                Object o = h.getColumnModel().getColumn(i).getHeaderValue();
                if (i < 0) {
                    selectedColumn = null;
                    return;
                }
                selectedColumn = o;
                h.requestFocusInWindow();
            }
        });
        final TableCellRenderer hr = table.getTableHeader().getDefaultRenderer();
        header.setDefaultRenderer(new TableCellRenderer() {

            private JLabel lbl;

            @Override
            public Component getTableCellRendererComponent(
                    JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
                if (selectedColumn == value) {
                    lbl = (JLabel) hr.getTableCellRendererComponent(table, value, true, true, row, column);
                    lbl.setBorder(BorderFactory.createCompoundBorder(lbl.getBorder(), BorderFactory.createLineBorder(Color.red, 1)));
                    lbl.setHorizontalAlignment(SwingConstants.LEFT);
                } else {
                    lbl = (JLabel) hr.getTableCellRendererComponent(table, value, false, false, row, column);
                    lbl.setBorder(BorderFactory.createCompoundBorder(lbl.getBorder(), BorderFactory.createEmptyBorder(0, 5, 0, 0)));
                    lbl.setHorizontalAlignment(SwingConstants.CENTER);
                }
                if (column == 0) {
                    lbl.setForeground(Color.red);
                } else {
                    lbl.setForeground(header.getForeground());
                }
                /*return (value == selectedColumn) ? hr.getTableCellRendererComponent(
                table, value, true, true, row, column) : hr.getTableCellRendererComponent(
                table, value, false, false, row, column);*/
                return lbl;
            }
        });
        table.setRowHeight(20);
        table.setPreferredScrollableViewportSize(table.getPreferredSize());
        JScrollPane scroll = new JScrollPane(table);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(scroll);
        frame.pack();
        frame.setLocation(150, 150);
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                SelectedTableHeader selectedTableHeader = new SelectedTableHeader();
            }
        });
    }
}

2 个答案:

答案 0 :(得分：4)

根据我的经验，当您覆盖任何DefaultTableCellHeaderRenderer JTable时，最好获得Renderer。因此，不要直接使用JLabel中的Renderer，而是使用Renderer抓取super()。所以，你的代码应该是这样的：

header.setDefaultRenderer(new DefaultTableCellHeaderRenderer() {


    @Override
    public Component getTableCellRendererComponent(
            JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
        DefaultTableCellHeaderRenderer rendererComponent = (DefaultTableCellHeaderRenderer)super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);

        if (selectedColumn == value) {
            rendererComponent.setBorder(BorderFactory.createCompoundBorder(rendererComponent.getBorder(), BorderFactory.createLineBorder(Color.red, 1)));
            rendererComponent.setHorizontalAlignment(SwingConstants.LEFT);
        } else {
            rendererComponent.setBorder(BorderFactory.createCompoundBorder(rendererComponent.getBorder(), BorderFactory.createEmptyBorder(0, 5, 0, 0)));
            rendererComponent.setHorizontalAlignment(SwingConstants.CENTER);
        }
        if (column == 0) {
            rendererComponent.setForeground(Color.red);
        } else {
            rendererComponent.setForeground(header.getForeground());
        }

        return rendererComponent;
    }
});

尝试直接回答您的问题：

问题1：

问：如何正确使用客户渲染器在JTable中绘制特定单元？

答：您当前的代码是在Renderer上设置JTableHeader。要在表格单元格上添加渲染器，代码与上面的代码类似，只有你通过Column模型设置它：

table.getColumnModel().getColumn(0).setCellRenderer(new DefaultTableCellRenderer() {
    @Override
    public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
        DefaultTableCellRenderer renderer = (DefaultTableCellRenderer)super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);

        // Set your code to render your component.

        return renderer;
    }

});

请注意：JTables是基于列的，这意味着某列中的所有数据必须是相同的类型（您的SSCCE遵循此约定）。我最喜欢的事情是为每种类型提供自定义Renderer。例如，每当我有Date列时，我都会使用此渲染器：

import java.awt.Component;
import javax.swing.JTable;
import javax.swing.table.DefaultTableCellRenderer;
import org.joda.time.LocalDate;

/**
 *
 * @author Ryan
 */
public class DateCellRenderer extends DefaultTableCellRenderer {

    String pattern;
    public DateCellRenderer(String pattern){
        this.pattern = pattern;
    }

    @Override
    public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
        DefaultTableCellRenderer renderer = (DefaultTableCellRenderer)super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
        if (value != null && value instanceof LocalDate) {
            renderer.setText(((LocalDate)value).toString(pattern));
        } else
            throw new IllegalArgumentException("Only supported Object type is LocalDate.");

        return renderer;
    }
}

我用类似的东西称这段代码：

table.getColumn("Date Entered").setCellRenderer(new DateCellRenderer("MMM dd, yyyy"));

问题2：

问：特别是一个表头颜色java swing

答：嗯..你的SSCCE好像已经弄明白了。

问题3：

问：关于super.getTableCellRendererComponent（...）必须是返回之前的最后一行代码行，我无法通过这些建议编写正确的渲染器，因为我只能这样工作

答：我不确定你的意思“必须在返回之前的最后一行代码行。”事实并非如此，我在上面的代码片段中证明了

问题4：

问：为Borders，Horizo​​ntalAlignment和Foreground添加了JLabel，特别是后台通过使用Component而不是JLabel引起了一些非句子，（在某种程度上不重要）

答：好的...... DefaultTableCellHeaderRenderer足以满足所有这些，边框，路线，前景和背景。

答案 1 :(得分：0)

我过去曾经遇到过这种情况，我确信它与细胞渲染器有关，但是ArraysXxxException种类的例外因为我忘记了取消选择并停止编辑< / strong>添加/删除行之前的单元格。在删除/添加之前，您应该在clearSelection()上尝试table.getCellEditor().stopCellEditing();和JTable，看看是否能解决您的问题。

首先，当然，确保它正在编辑：

if (table.isEditing()) {
    table.getCellEditor().stopCellEditing();
}
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