JTable在单击鼠标时更改单元格背景-发布后又更改背景了吗? [英] JTable change cell background at mouse click - after release change background back?
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问题描述
我的问题是,如何解决以下问题:
my question is, how to solve following problem:
如果我单击JTable中的单元格,我想更改其背景.如果释放鼠标按钮,我希望背景变回正常颜色.
If i click on a cell in a JTable, i want to change its background. If i release the mousebutton, i want the background change back to normal color.
有可能吗?
问候ayk
推荐答案
在渲染器中,您必须覆盖hasFocus
in your renderer you have to overide hasFocus
例如
import java.awt.*;
import java.util.*;
import javax.swing.*;
import javax.swing.table.*;
public class TableRenderer extends JFrame {
private static final long serialVersionUID = 1L;
private JTable table;
private String[] columnNames = {"Date", "String", "Centered", "Integer", "Boolean"};
private Object[][] data = {
{new Date(), "A", "A", new Integer(1), true},
{new Date(), "B", "B", new Integer(2), false},
{new Date(), "C", "C", new Integer(10), null},
{new Date(), "D", "D", new Integer(4), false}
};
public TableRenderer() {
DefaultTableModel model = new DefaultTableModel(data, columnNames);
table = new JTable(model) {
private static final long serialVersionUID = 1L;
// Returning the Class of each column will allow different
// renderers to be used based on Class
@Override
public Class getColumnClass(int column) {
return getValueAt(0, column).getClass();
}
};
table.setPreferredScrollableViewportSize(table.getPreferredSize());
JScrollPane scrollPane = new JScrollPane(table);
getContentPane().add(scrollPane);
// Override default renderer on a specific Class
TableCellRenderer colorRenderer = new ColorRenderer();
table.setDefaultRenderer(String.class, colorRenderer);
// Override default renderer for a specific column
DefaultTableCellRenderer centerRenderer = new DefaultTableCellRenderer();
centerRenderer.setHorizontalAlignment(JLabel.CENTER);
table.getColumnModel().getColumn(2).setCellRenderer(centerRenderer);
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
TableRenderer frame = new TableRenderer();
frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
/*
** Color the focused cell
*/
private class ColorRenderer extends DefaultTableCellRenderer {
private static final long serialVersionUID = 1L;
@Override
public Component getTableCellRendererComponent(
JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
if (hasFocus) {
setBackground(Color.cyan);
} else if (isSelected) {
setBackground(table.getSelectionBackground());
} else {
setBackground(table.getBackground());
}
return this;
}
}
}
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