you can to get this one
by
f.pack()
beforef.setVisible(true);
desired widht should be at 22 / 23 pixelx but
component.getPreferredSize(
) orSwingUtilities#computeStringWidth(FontMetrics fm, String str)
returns only 17 / 18 and plustable.getIntercellSpacing().width
only one pixel for Po - Nenote real workaround could be based on TableColumnAdjuster by @camickr
from code
import java.awt.*;
import javax.swing.*;
import javax.swing.table.*;
import javax.swing.text.JTextComponent;
public class Main {
public static void main(String[] args) {
new Main().start();
}
private void start() {
JFrame f = new JFrame();
f.setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
initTable();
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException e) {
}
JPanel calendar = new JPanel();
calendar.setLayout(new GridBagLayout());
calendar.setBorder(BorderFactory.createTitledBorder("Calendar"));
gbc.fill = GridBagConstraints.NONE;
gbc.gridx = 0;
gbc.gridy = 0;
gbc.weighty = 0;
gbc.weightx = 0;
calendar.add(scrollPane, gbc);
f.add(calendar, gbc);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.pack();
f.setVisible(true);
}
JTable table;
JScrollPane scrollPane;
CalendarTableModel tableModel;
private void initTable() {
setTable(new JTable());
getTable().setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
getTable().setAutoscrolls(false);
getTable().getTableHeader().setResizingAllowed(false);
getTable().getTableHeader().setReorderingAllowed(false);
getTable().setColumnSelectionAllowed(true);
getTable().setRowSelectionAllowed(true);
getTable().setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
tableModel = new CalendarTableModel(); //my class extended from AbstractTableModel
getTable().setModel(tableModel);
scrollPane = new JScrollPane(table, JScrollPane.VERTICAL_SCROLLBAR_NEVER, JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
scrollPane.setAutoscrolls(false);
TableColumnModel columnModel = table.getColumnModel();
for (int col = 0; col < table.getColumnCount(); col++) {
int maxWidth = 0;
for (int row = 0; row < table.getRowCount(); row++) {
TableCellRenderer rend = table.getCellRenderer(row, col);
Object value = table.getValueAt(row, col);
Component comp = rend.getTableCellRendererComponent(table, value, false, false, row, col);
maxWidth = Math.max(comp.getPreferredSize().width, maxWidth);
}
TableColumn column = columnModel.getColumn(col);
TableCellRenderer headerRenderer = column.getHeaderRenderer();
if (headerRenderer == null) {
headerRenderer = table.getTableHeader().getDefaultRenderer();
}
Object headerValue = column.getHeaderValue();
Component headerComp = headerRenderer.getTableCellRendererComponent(table, headerValue, false, false, 0, col);
maxWidth = Math.max(maxWidth, headerComp.getPreferredSize().width);
// note some extra padding
column.setPreferredWidth(maxWidth + 6);//IntercellSpacing * 2 + 2 * 2 pixel instead of taking this value from Borders
}
DefaultTableCellRenderer stringRenderer = (DefaultTableCellRenderer) table.getDefaultRenderer(String.class);
stringRenderer.setHorizontalAlignment(SwingConstants.CENTER);
table.setPreferredScrollableViewportSize(table.getPreferredSize());
}
private void setTable(JTable jTable) {
this.table = jTable;
}
private JTable getTable() {
return this.table;
}
private class CalendarTableModel extends AbstractTableModel {
private String[] daysData = {"Pondelok", "Út", "St", "Čt", "Pá", "Sobota", "Ne"};
private int[][] values;
public CalendarTableModel() {
values = new int[7][6];
for (int i = 0; i < 6; i++) {
for (int j = 0; j < 7; j++) {
values[j][i] = 30;
}
}
}
@Override
public int getRowCount() {
return 6;
}
@Override
public int getColumnCount() {
return 7;
}
@Override
public String getColumnName(int column) {
return daysData[column];
}
@Override
public Object getValueAt(int row, int column) {
return this.values[column][row];
}
@Override
public boolean isCellEditable(int row, int column) {
return false;
}
}
}