Question

我已经尝试了一段时间，并通过互联网寻找解决方案但是我失败了。我想要做的是动态更改Jtable的行背景。我创建了arrayList，它保留了所选行的数量（每次用户按alt +单击一个单元格时添加它们）并在我自己的tableCellRenderer中添加了

for(Integer c: leftSelectedCells){
if(c.equals(row)){comp.setForeground(Color.red); }
else { comp.setForeground(Color.black);}
}

它正在工作，对于很少的单元格，或者在选定的列恢复到它们的原始颜色之后的某个时间，我已经检查过，这些int仍然在Array中，这不是问题，任何想法可能导致问题？< / p>

Answer 1

正如上面评论中已经提到的，您需要为所有必需的列提供自定义渲染器。作为替代方法，您可以覆盖JTable.prepareRenderer以根据受影响的行列表设置背景。 @camickr Table Row Rendering解释了这种方法。下面是一个示例，突出显示使用鼠标+ Alt 键单击的行。为简单起见，突出显示的行列表保留为客户端属性。

import java.awt.Color;
import java.awt.Component;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.ArrayList;
import java.util.List;

import javax.swing.*;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellRenderer;

public class TableHighlight {
    TableHighlight() {
        JFrame frame = new JFrame("TableHighlight");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        Object[][] data = { { "Column 1", "Column 2" },
                { "Column 1", "Column 2" }, { "Column 1", "Column 2" },
                { "Column 1", "Column 2" } };

        Object[] columnNames = { "Column 1", "Column 2" };

        DefaultTableModel model = new DefaultTableModel(data, columnNames);

        final JTable table = new JTable(model) {
            @Override
            public Component prepareRenderer(TableCellRenderer renderer,
                    int row, int column) {
                Component c = super.prepareRenderer(renderer, row, column);
                List<Integer> selectedRows = (List<Integer>) getClientProperty("highlightRows");
                c.setBackground(selectedRows.contains(row) ? Color.cyan : getBackground());
                return c;
            }
        };

        table.putClientProperty("highlightRows", new ArrayList<Integer>());

        table.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseClicked(MouseEvent evt) {
                if (!evt.isAltDown())
                    return;
                int row = table.rowAtPoint(evt.getPoint());
                if (row == -1)
                    return;
                List<Integer> selectedRows = (List<Integer>) table
                        .getClientProperty("highlightRows");
                int index = selectedRows.indexOf(row);
                if (index != -1)
                    selectedRows.remove(index);
                else
                    selectedRows.add(row);
                table.repaint();
            }
        });

        frame.add(new JScrollPane(table));
        frame.setLocationByPlatform(true);
        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String args[]) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                new TableHighlight();
            }
        });
    }
}

Answer 2

我建议使用CTRL进行多选而不是ALT。首先，任何想要多选的用户都已经知道如何操作，因为CTRL是多选的事实上的标准修改键。其次，你可以免费获得你想要的行为，而不必实现任何特殊的行为（可能除了你喜欢的颜色方案）。

package com.example.table.multiselect;

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

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellRenderer;

public class MultiRowTableSelect extends JFrame {

    public MultiRowTableSelect() {
        DefaultTableModel model = new DefaultTableModel(0, 3);
        model.addRow(new Integer[]{1, 2, 3});
        model.addRow(new Integer[]{4, 5, 6});
        model.addRow(new Integer[]{7, 8, 9});
        model.addRow(new Integer[]{10, 11, 12});

        JTable tbl = new JTable(model);
        tbl.setRowSelectionAllowed(true); // when you click a cell, the entire row will be highlighted

        /* Assuming you want all cells to be rendered using the custom renderer
         * unless otherwise overridden, you can simply set the JTable's default
         * renderer.  The implementation is so simple here that I'm just
         * creating an anonymous subclass of DefaultTableCellRenderer.
         */
        tbl.setDefaultRenderer(Object.class, new DefaultTableCellRenderer() {
            @Override
            public Component getTableCellRendererComponent(JTable table, Object value,
                    boolean isSelected, boolean hasFocus, int row, int column) {

                Component c = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);

                if (isSelected) {
                    c.setForeground(Color.RED); // you can set the foreground and/or background here
                }

                return c;
            }
        });

        add(new JScrollPane(tbl), BorderLayout.CENTER);

        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setLocationByPlatform(true);
        pack();
        setSize(400, 200);
        setVisible(true);
    }


    /**
     * @param args
     */
    public static void main(String[] args) {
        new MultiRowTableSelect();
    }

}

Jtable cellRenderer更改行的背景

2 个答案: