I already add a picture with JLabel in my JTable with TableCellRenderer. But how to add a border to the JLabel when mouse moves over the cell, on specific column and row?
This is the 1st renderer class:
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));
}
}
This is 2nd renderer class:
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));
}
}
and this is how I set the mouse enter and mouse clicked in my JTable:
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());
}
But this adds a border to all cells in column 6 when mouse moves ofer a cell of that column. How to change it only into specific row and column when mouse entered that row and column?
So, for a particular column of your table, you want to paint a border on the cell that is hovered by the mouse (only the hovered cell, only in this column).
(edit: after clarification it appears that this question has been asked before -- I'm leaving my answer below as it might still help)
don't change the cell renderer dynamically, have only 1 renderer for that column, and handle that situation within the single renderer.
don't add listeners on the Component
that is returned by the renderer: such listeners won't be triggered, as the component is only used for its paint()
-ing logic.
instead, add a mouse motion listener on the table itself, and compute the coordinates of hovered cells with JTable
's methods rowAtPoint
and columnAtPoint
, when mouse moves over table, or exits the area.
(irrelevant to problem at hand, but deserves a mention) Avoid creating a new JLabel
for each call of your renderer, this is wasteful. Swing is single-thread, it's safe to reuse the same object (provided you don't forget to reset all its properties that might have changed between 2 calls)
Small demo that shows the effect:
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;
}
}
}
Note 1: I'm using the default cell renderer, unlike you, but the same idea applies. The demo above is a generic example, that will be more useful as example to keep here than a specific solution for your case (for example, in my interpretation of the problem, I understand the details about icon are irrelevant).
Note 2: In the demo I repaint the whole visible area each time, but if you want to optimize it should be possible to repaint only 2 cells, that's an entire new question, see here for help about that.
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