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What are the differences between the TableCellRenderer and TableCellEditor in Java?
TableCellRenderer
- A TableCellRenderer creates a component that displays the value of a JTable cell.
- The default renderer uses JLabel to display the value of each table cell.
- The TableCellRenderer interface can be specified in two ways : By class of the object to be rendered using table.setDefaultRenderer() method and by a column using tableColumn.setCellRenderer() method and tableColumn.setHeaderRenderer() method for a specific column headers.
- The TableCellRenderer interface has only one method getTableCellRendererComponent() and this method can return different rendering components based on the value, a cell has the focus or is selected, row and column that can contain the value.
TableCellEditor
- A TableCellEditor is an interface and by default, the cells can be editable.
- A TableCellEditor can be determined by calling isCellEditable() method of a TableModel.
- If the class of a cell value is Boolean, a JCheckBox can be used. If must double click to put in edit mode, a JTextField can be used.
- The TableCellEditor interface has only one method getTableCellEditorComponent() and this method can return different editing components based on the value, a cell is selected, row and column that can contain the value.
Example
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.*;
public class TableCellRendererEditorTest extends JFrame {
private JTable table;
public TableCellRendererEditorTest() {
setTitle("TableCellRendererEditor Test");
DefaultTableModel dtm = new DefaultTableModel() {
public boolean isCellEditable(int row, int column) {
return !(column == 0);
}
};
dtm.setDataVector(new Object[][]{{"Table Cell Renderer", "Table Cell Editor"}, {"Table Cell Renderer","Table Cell Editor"}}, new Object[]{"Renderer","Editor"});
table = new JTable(dtm);
table.getColumn("Editor").setCellRenderer(new TextAreaRenderer());
table.getColumn("Editor").setCellEditor(new TextAreaEditor());
table.setRowHeight(80);
JScrollPane spane = new JScrollPane(table);
add(spane);
setSize(400, 275);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationRelativeTo(null);
setVisible(true);
}
public static void main(String[] args) {
new TableCellRendererEditorTest();
}
}
class TextAreaRenderer extends JScrollPane implements TableCellRenderer {
JTextArea textarea;
public TextAreaRenderer() {
textarea = new JTextArea();
textarea.setLineWrap(true);
textarea.setWrapStyleWord(true);
getViewport().add(textarea);
}
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus,int row, int column) {
if (isSelected) {
setForeground(table.getSelectionForeground());
setBackground(table.getSelectionBackground());
textarea.setForeground(table.getSelectionForeground());
textarea.setBackground(table.getSelectionBackground());
} else {
setForeground(table.getForeground());
setBackground(table.getBackground());
textarea.setForeground(table.getForeground());
textarea.setBackground(table.getBackground());
}
textarea.setText((String) value);
textarea.setCaretPosition(0);
return this;
}
}
class TextAreaEditor extends DefaultCellEditor {
protected JScrollPane scrollpane;
protected JTextArea textarea;
public TextAreaEditor() {
super(new JCheckBox());
scrollpane = new JScrollPane();
textarea = new JTextArea();
textarea.setLineWrap(true);
textarea.setWrapStyleWord(true);
scrollpane.getViewport().add(textarea);
}
public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
textarea.setText((String) value);
return scrollpane;
}
public Object getCellEditorValue() {
return textarea.getText();
}
}Output
Updated on: 10-Feb-2020
894 Views
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