get Max Column Width in JTable - Java Swing

Java examples for Swing:JTable Column

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Description

get Max Column Width in JTable

Demo Code


//package com.java2s;
import javax.swing.*;

import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Component;
import javax.swing.text.JTextComponent;

import javax.swing.table.TableColumn;
import javax.swing.table.TableCellRenderer;

public class Main {
    private static int getMaxColumnWidth(JTable aTable, int columnNo,
            boolean includeColumnHeaderWidth, int columnPadding) {
        TableColumn column = aTable.getColumnModel().getColumn(columnNo);
        Component comp = null;//w ww. j  a va  2  s.  co  m
        int maxWidth = 0;
        if (includeColumnHeaderWidth) {
            TableCellRenderer headerRenderer = column.getHeaderRenderer();
            if (headerRenderer != null) {
                comp = headerRenderer.getTableCellRendererComponent(aTable,
                        column.getHeaderValue(), false, false, 0, columnNo);
                if (comp instanceof JTextComponent) {
                    JTextComponent jtextComp = (JTextComponent) comp;
                    String text = jtextComp.getText();
                    Font font = jtextComp.getFont();
                    FontMetrics fontMetrics = jtextComp
                            .getFontMetrics(font);
                    maxWidth = SwingUtilities.computeStringWidth(
                            fontMetrics, text);
                } else {
                    maxWidth = comp.getPreferredSize().width;
                }
            } else {
                try {
                    String headerText = (String) column.getHeaderValue();
                    JLabel defaultLabel = new JLabel(headerText);
                    Font font = defaultLabel.getFont();
                    FontMetrics fontMetrics = defaultLabel
                            .getFontMetrics(font);
                    maxWidth = SwingUtilities.computeStringWidth(
                            fontMetrics, headerText);
                } catch (ClassCastException ce) {
                    // Can't work out the header column width..
                    maxWidth = 0;
                }
            }
        }
        TableCellRenderer tableCellRenderer;
        // Component comp;
        int cellWidth = 0;
        for (int i = 0; i < aTable.getRowCount(); i++) {
            tableCellRenderer = aTable.getCellRenderer(i, columnNo);
            comp = tableCellRenderer.getTableCellRendererComponent(aTable,
                    aTable.getValueAt(i, columnNo), false, false, i,
                    columnNo);
            if (comp instanceof JTextComponent) {
                JTextComponent jtextComp = (JTextComponent) comp;
                String text = jtextComp.getText();
                Font font = jtextComp.getFont();
                FontMetrics fontMetrics = jtextComp.getFontMetrics(font);
                int textWidth = SwingUtilities.computeStringWidth(
                        fontMetrics, text);
                maxWidth = Math.max(maxWidth, textWidth);
            } else {
                cellWidth = comp.getPreferredSize().width;
                // maxWidth = Math.max ( headerWidth, cellWidth );
                maxWidth = Math.max(maxWidth, cellWidth);
            }
        }
        return (maxWidth + columnPadding);
    }
}

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