Java JTable:如何使用TableCellRenderer实现自定义滚动效果
我已经在我的JTable with TableCellRenderer中添加了一张带有JLabel的图片。但是,当鼠标移动到单元格上的特定列和行上时,如何向JLabel添加边框 这是第一个渲染器类:Java JTable:如何使用TableCellRenderer实现自定义滚动效果,java,swing,jtable,Java,Swing,Jtable,我已经在我的JTable with TableCellRenderer中添加了一张带有JLabel的图片。但是,当鼠标移动到单元格上的特定列和行上时,如何向JLabel添加边框 这是第一个渲染器类: public class RenderTabel implements TableCellRenderer{ @Override public Component getTableCellRendererComponent(JTable table, Object value,boolean is
public class RenderTabel implements TableCellRenderer{
@Override
public Component getTableCellRendererComponent(JTable table, Object
value,boolean isSelected, boolean hasFocus,int row, int column){
JLabel gambar=new JLabel();
String url="D:\\Kuliah Semester 4\\Pemrograman Berorientasi Objek\\DINUS BOOKSTORE\\image";
ImageIcon img=scalegmbr(url+"\\"+table.getModel().getValueAt(row, 0)+".png");
gambar.setIcon(img);
gambar.setText("");
gambar.setHorizontalAlignment(SwingConstants.CENTER);
table.setRowHeight(row, 50);
table.getColumnModel().getColumn(column).setPreferredWidth(80);
return gambar;
}
public ImageIcon scalegmbr(String file){
Image image=new ImageIcon(file).getImage();
return new ImageIcon(image.getScaledInstance(80,50,SCALE_SMOOTH));
}
}
public class RenderTabel1 implements TableCellRenderer{
@Override
public Component getTableCellRendererComponent(JTable table, Object
value,boolean isSelected, boolean hasFocus,int row, int column){
JLabel gambar=new JLabel();
String url="D:\\Kuliah Semester 4\\Pemrograman Berorientasi Objek\\DINUS BOOKSTORE\\image";
ImageIcon img=scalegmbr(url+"\\"+table.getModel().getValueAt(row, 0)+".png");
gambar.setIcon(img);
gambar.setText("");
gambar.setHorizontalAlignment(SwingConstants.CENTER);
gambar.setBorder(javax.swing.BorderFactory.createLineBorder(new java.awt.Color(200, 100, 52), 2));
table.setRowHeight(row, 50);
table.getColumnModel().getColumn(column).setPreferredWidth(80);
return gambar;
}
public ImageIcon scalegmbr(String file){
Image image=new ImageIcon(file).getImage();
return new ImageIcon(image.getScaledInstance(80,50,SCALE_SMOOTH));
}
}
这是二级渲染器:
public class RenderTabel implements TableCellRenderer{
@Override
public Component getTableCellRendererComponent(JTable table, Object
value,boolean isSelected, boolean hasFocus,int row, int column){
JLabel gambar=new JLabel();
String url="D:\\Kuliah Semester 4\\Pemrograman Berorientasi Objek\\DINUS BOOKSTORE\\image";
ImageIcon img=scalegmbr(url+"\\"+table.getModel().getValueAt(row, 0)+".png");
gambar.setIcon(img);
gambar.setText("");
gambar.setHorizontalAlignment(SwingConstants.CENTER);
table.setRowHeight(row, 50);
table.getColumnModel().getColumn(column).setPreferredWidth(80);
return gambar;
}
public ImageIcon scalegmbr(String file){
Image image=new ImageIcon(file).getImage();
return new ImageIcon(image.getScaledInstance(80,50,SCALE_SMOOTH));
}
}
public class RenderTabel1 implements TableCellRenderer{
@Override
public Component getTableCellRendererComponent(JTable table, Object
value,boolean isSelected, boolean hasFocus,int row, int column){
JLabel gambar=new JLabel();
String url="D:\\Kuliah Semester 4\\Pemrograman Berorientasi Objek\\DINUS BOOKSTORE\\image";
ImageIcon img=scalegmbr(url+"\\"+table.getModel().getValueAt(row, 0)+".png");
gambar.setIcon(img);
gambar.setText("");
gambar.setHorizontalAlignment(SwingConstants.CENTER);
gambar.setBorder(javax.swing.BorderFactory.createLineBorder(new java.awt.Color(200, 100, 52), 2));
table.setRowHeight(row, 50);
table.getColumnModel().getColumn(column).setPreferredWidth(80);
return gambar;
}
public ImageIcon scalegmbr(String file){
Image image=new ImageIcon(file).getImage();
return new ImageIcon(image.getScaledInstance(80,50,SCALE_SMOOTH));
}
}
这就是我在JTable中设置鼠标输入和鼠标单击的方式:
private void tblbukuMouseEntered(java.awt.event.MouseEvent evt) {
// TODO add your handling code here:
tblbuku.getColumnModel().getColumn(6).setCellRenderer( new RenderTabel1());
}
private void tblbukuMouseExited(java.awt.event.MouseEvent evt) {
// TODO add your handling code here:
tblbuku.getColumnModel().getColumn(6).setCellRenderer( new RenderTabel());
}
但当鼠标移动到第6列的某个单元格上时,会为该列的所有单元格添加边框。当鼠标输入特定的行和列时,如何将其仅更改为特定的行和列?因此,对于表格的特定列,您希望在鼠标悬停的单元格上绘制边框(仅悬停的单元格,仅在此列中) (编辑:澄清之后,我似乎在下面留下我的答案,因为它可能仍然有用)
- 不要动态更改单元渲染器,该列只有一个渲染器,并在单个渲染器中处理这种情况
- 不要在呈现程序返回的
组件上添加侦听器:不会触发此类侦听器,因为该组件仅用于其
-ing逻辑paint()
- 相反,在工作台上添加一个鼠标运动监听器,当鼠标移动到工作台上方或退出该区域时,使用
的方法JTable
和rowAtPoint
计算悬停单元格的坐标columnAtPoint
- (与当前问题无关,但值得一提)避免为渲染器的每次调用创建新的
,这是浪费。Swing是单线程的,可以安全地重用同一个对象(前提是不要忘记重置其在两次调用之间可能已更改的所有属性)JLabel
import javax.swing.*;
import javax.swing.table.DefaultTableCellRenderer;
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
public class SimpleTableDemo extends JPanel {
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(SimpleTableDemo::createAndShowGUI);
}
private int
hoveredRow = -1,
hoveredColumn = -1;
SimpleTableDemo() {
super(new GridLayout(1,0));
String[] columnNames = {"First Name", "Last Name", "Sport", "# of Years", "Vegetarian"};
Object[][] data = {
{"Kathy", "Smith", "Snowboarding", 5, Boolean.FALSE},
{"John", "Doe", "Rowing", 3, Boolean.TRUE},
{"Sue", "Black", "Knitting", 2, Boolean.FALSE},
{"Jane", "White", "Speed reading", 20, Boolean.TRUE},
{"Joe", "Brown", "Pool", 10, Boolean.FALSE}
};
final JTable table = new JTable(data, columnNames);
table.setPreferredScrollableViewportSize(new Dimension(500, 70));
table.setFillsViewportHeight(true);
table.getColumn("Sport").setCellRenderer(new MyCellRenderer());
table.addMouseMotionListener(new MouseAdapter() {
public void mouseMoved(MouseEvent e) {
Point p = e.getPoint();
hoveredRow = table.rowAtPoint(p);
hoveredColumn = table.columnAtPoint(p);
table.repaint();
}
public void mouseExited(MouseEvent e) {
hoveredRow = hoveredColumn = -1;
table.repaint();
}
});
JScrollPane scrollPane = new JScrollPane(table);
add(scrollPane);
}
private static void createAndShowGUI() {
JFrame frame = new JFrame("SimpleTableDemo");
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
SimpleTableDemo newContentPane = new SimpleTableDemo();
newContentPane.setOpaque(true);
frame.setContentPane(newContentPane);
frame.pack();
frame.setVisible(true);
}
private class MyCellRenderer extends DefaultTableCellRenderer {
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
JLabel label = (JLabel) super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
if (hoveredColumn == column && hoveredRow == row) {
label.setBorder(BorderFactory.createLineBorder(Color.GREEN, 2));
}
else {
label.setBorder(BorderFactory.createEmptyBorder(2, 2, 2, 2));
}
return label;
}
}
}
注1:与您不同,我使用的是默认的单元渲染器,但同样的想法也适用。上面的演示是一个通用示例,作为示例保存在这里比作为您案例的特定解决方案更有用(例如,在我对问题的解释中,我理解关于图标的细节是不相关的)
注2:在演示中,我每次都会重新绘制整个可见区域,但如果您想优化,应该可以只重新绘制2个单元格,这是一个全新的问题,请参阅以获取相关帮助。如果您创建并发布一个有效的、小但完整的程序,该程序只有必要的代码来演示您的问题,这将非常有帮助,我们可以复制、粘贴、编译和运行而无需修改,因为这将帮助我们完全理解您可能做错了什么。请注意,这是作为代码格式文本发布的代码,而不是作为指向非站点资源的链接。将鼠标运动侦听器添加到单元格渲染器返回的组件。已经这样做了,但没有效果:(好的,我将尝试并告诉结果later@mKorbel谢谢,添加了答案的链接。现在OP确认它有效了,这可能值得优化。