JTable layout Columns - Java Swing

Java examples for Swing:JTable Column

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Description

JTable layout Columns

Demo Code


//package com.java2s;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Point;

import javax.swing.JTable;

import javax.swing.table.JTableHeader;
import javax.swing.table.TableColumn;

public class Main {
    public static void layoutColumns(JTable p_Table,
            boolean p_OnlyVisibleRows) {
        int column = 0;
        TableColumn c = null;/*from w  w  w.  j  a  va  2 s.co  m*/
        int firstRow = p_OnlyVisibleRows ? getFirstVisibleRow(p_Table) : 0;
        int lastRow = p_OnlyVisibleRows ? getLastVisibleRow(p_Table)
                : (p_Table.getModel().getRowCount() - 1);
        Dimension intercellSpacing = p_Table.getIntercellSpacing();
        JTableHeader tableHeader = p_Table.getTableHeader();
        for (java.util.Enumeration columns = tableHeader.getColumnModel()
                .getColumns(); columns.hasMoreElements(); column++) {
            c = (TableColumn) columns.nextElement();
            Component component = (c.getHeaderRenderer() != null) ? c
                    .getHeaderRenderer().getTableCellRendererComponent(
                            p_Table, c.getHeaderValue(), false, false, -1,
                            column) : tableHeader.getDefaultRenderer()
                    .getTableCellRendererComponent(p_Table,
                            c.getHeaderValue(), false, false, -1, column);

            int width = Math.max(c.getWidth(),
                    component.getPreferredSize().width);
            if (firstRow >= 0) {
                for (int i = firstRow, d = lastRow; i <= d; i++) {
                    width = Math.max(
                            width,
                            p_Table.getCellRenderer(i, column)
                                    .getTableCellRendererComponent(
                                            p_Table,
                                            p_Table.getModel().getValueAt(
                                                    i, column), false,
                                            false, i, column)
                                    .getPreferredSize().width
                                    + intercellSpacing.width);
                }
            }
            c.setPreferredWidth(width);
            c.setWidth(width);
        }
    }

    public static int getFirstVisibleRow(JTable p_Table) {
        Point p = p_Table.getVisibleRect().getLocation();
        return p_Table.rowAtPoint(p);
    }

    public static int getLastVisibleRow(JTable p_Table) {
        Point p = p_Table.getVisibleRect().getLocation();
        p.y = p.y + p_Table.getVisibleRect().height - 1;
        int result = p_Table.rowAtPoint(p);
        if (result > 0)
            return result;

        // if there is no rows at this point,rowatpoint() return -1,
        // It means that there is not enough rows to fill the rectangle where
        // the table is displayed.
        // if this case we return getRowCount()-1 because
        // we are sure that the last row is visible
        if (p_Table.getVisibleRect().height > 0)
            return p_Table.getRowCount() - 1;
        else
            return -1;
    }
}

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