FrozenColumnHeader.java Source code

Introduction

Here is the source code for FrozenColumnHeader.java

Source

import java.awt.Component;
import java.awt.Dimension;

import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.SwingUtilities;
import javax.swing.table.DefaultTableColumnModel;
import javax.swing.table.TableColumn;
import javax.swing.table.TableColumnModel;

public class FrozenColumnHeader extends JScrollPane {

    protected JTable mainTable;
    protected JTable headerTable;
    protected int columnCount;

    public FrozenColumnHeader(JTable table, int columns) {
        super();
        mainTable = table;
        headerTable = new JTable(mainTable.getModel());
        getViewport().setView(headerTable);
        columnCount = columns;
    }

    public void addNotify() {
        TableColumn column;
        super.addNotify();
        TableColumnModel mainModel = mainTable.getColumnModel();
        TableColumnModel headerModel = new DefaultTableColumnModel();
        int frozenWidth = 0;
        for (int i = 0; i < columnCount; i++) {
            column = mainModel.getColumn(0);
            mainModel.removeColumn(column);
            headerModel.addColumn(column);
            frozenWidth += column.getPreferredWidth() + headerModel.getColumnMargin();
        }
        headerTable.setColumnModel(headerModel);
        Component columnHeader = getColumnHeader().getView();
        getColumnHeader().setView(null);
        JScrollPane mainScrollPane = (JScrollPane) SwingUtilities.getAncestorOfClass(JScrollPane.class, mainTable);
        mainScrollPane.setCorner(JScrollPane.UPPER_LEFT_CORNER, new JLabel("..."));

        headerTable.setPreferredScrollableViewportSize(new Dimension(frozenWidth, 0));
    }

}