[JAVA][SWING]JTable Row Header Example

위 이미지와 같은 이쁜놈을 만들고 싶었다

JTable 로는 왼편 1 ~ 를 만들어주는 방법을 몰랐다.

그래서 찾아본 검색 결과

// Example from http://www.crionics.com/products/opensource/faq/swing_ex/SwingExamples.html
/* (swing1.1beta3) */
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
 
import javax.swing.AbstractListModel;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.ListCellRenderer;
import javax.swing.ListModel;
import javax.swing.UIManager;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.JTableHeader;
 
/**
 * @version 1.0 11/09/98
 */
 
class RowHeaderRenderer extends JLabel implements ListCellRenderer {
 
    RowHeaderRenderer(JTable table) {
        JTableHeader header = table.getTableHeader();
        setOpaque(true);
        setBorder(UIManager.getBorder("TableHeader.cellBorder"));
        setHorizontalAlignment(CENTER);
        setForeground(header.getForeground());
        setBackground(header.getBackground());
        setFont(header.getFont());
    }
 
    public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected,
            boolean cellHasFocus) {
        setText((value == null) ? "" : value.toString());
        return this;
    }
}
 
public class RowHeaderExample extends JFrame {
 
    public RowHeaderExample() {
        super("Row Header Example");
        setSize(300, 150);
 
        ListModel lm = new AbstractListModel() {
            String headers[] = { "a", "2", "c", "d", "e", "f", "g", "h", "i" };
 
            public int getSize() {
                return headers.length;
            }
 
            public Object getElementAt(int index) {
                return headers[index];
            }
        };
 
        DefaultTableModel dm = new DefaultTableModel(lm.getSize(), 100);
        JTable table = new JTable(dm);
        table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
 
        JList rowHeader = new JList(lm);
        rowHeader.setFixedCellWidth(50);
 
        rowHeader.setFixedCellHeight(table.getRowHeight() + table.getRowMargin());
        // + table.getIntercellSpacing().height);
        rowHeader.setCellRenderer(new RowHeaderRenderer(table));
 
        JScrollPane scroll = new JScrollPane(table);
        scroll.setRowHeaderView(rowHeader);
        getContentPane().add(scroll, BorderLayout.CENTER);
    }
 
    public static void main(String[] args) {
        RowHeaderExample framwlrmae = new RowHeaderExample();
        framwlrmae.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
        framwlrmae.setVisible(true);
    }
}

출처 : http://www.java2s.com/Code/Java/Swing-Components/TableRowHeaderExample.htm

출력 결과는 

위 이미지에서 보다싶이 왼편에 숫자대신 a b c d 찍어주긴 하지만 라인이 딱딱 맞아 떨어지지 않음을 확인할 수 있다

즉 ... 죄송하지만 어설퍼 보인다는것 대중성을 고려한다면 ... X

---

조금더 조회해보니 

위 이미지와 같은 결과가 나오는 소스가 있었으니

출처는 : https://tips4java.wordpress.com/2008/11/18/row-number-table/

하지만 소스는

RowNumberTable.java

import java.awt.*;
import java.awt.event.*;
import java.beans.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;
 
/*
 *    Use a JTable as a renderer for row numbers of a given main table.
 *  This table must be added to the row header of the scrollpane that
 *  contains the main table.
 */
public class RowNumberTable extends JTable
    implements ChangeListener, PropertyChangeListener, TableModelListener
{
    private JTable main;
 
    public RowNumberTable(JTable table)
    {
        main = table;
        main.addPropertyChangeListener( this );
        main.getModel().addTableModelListener( this );
 
        setFocusable( false );
        setAutoCreateColumnsFromModel( false );
        setSelectionModel( main.getSelectionModel() );
 
 
        TableColumn column = new TableColumn();
        column.setHeaderValue(" ");
        addColumn( column );
        column.setCellRenderer(new RowNumberRenderer());
 
        getColumnModel().getColumn(0).setPreferredWidth(50);
        setPreferredScrollableViewportSize(getPreferredSize());
    }
 
    @Override
    public void addNotify()
    {
        super.addNotify();
 
        Component c = getParent();
 
        //  Keep scrolling of the row table in sync with the main table.
 
        if (c instanceof JViewport)
        {
            JViewport viewport = (JViewport)c;
            viewport.addChangeListener( this );
        }
    }
 
    /*
     *  Delegate method to main table
     */
    @Override
    public int getRowCount()
    {
        return main.getRowCount();
    }
 
    @Override
    public int getRowHeight(int row)
    {
        int rowHeight = main.getRowHeight(row);
 
        if (rowHeight != super.getRowHeight(row))
        {
            super.setRowHeight(row, rowHeight);
        }
 
        return rowHeight;
    }
 
    /*
     *  No model is being used for this table so just use the row number
     *  as the value of the cell.
     */
    @Override
    public Object getValueAt(int row, int column)
    {
        return Integer.toString(row + 1);
    }
 
    /*
     *  Don't edit data in the main TableModel by mistake
     */
    @Override
    public boolean isCellEditable(int row, int column)
    {
        return false;
    }
 
    /*
     *  Do nothing since the table ignores the model
     */
    @Override
    public void setValueAt(Object value, int row, int column) {}
//
//  Implement the ChangeListener
//
    public void stateChanged(ChangeEvent e)
    {
        //  Keep the scrolling of the row table in sync with main table
 
        JViewport viewport = (JViewport) e.getSource();
        JScrollPane scrollPane = (JScrollPane)viewport.getParent();
        scrollPane.getVerticalScrollBar().setValue(viewport.getViewPosition().y);
    }
//
//  Implement the PropertyChangeListener
//
    public void propertyChange(PropertyChangeEvent e)
    {
        //  Keep the row table in sync with the main table
 
        if ("selectionModel".equals(e.getPropertyName()))
        {
            setSelectionModel( main.getSelectionModel() );
        }
 
        if ("rowHeight".equals(e.getPropertyName()))
        {
            repaint();
        }
 
        if ("model".equals(e.getPropertyName()))
        {
            main.getModel().addTableModelListener( this );
            revalidate();
        }
    }
 
//
//  Implement the TableModelListener
//
    @Override
    public void tableChanged(TableModelEvent e)
    {
        revalidate();
    }
 
    /*
     *  Attempt to mimic the table header renderer
     */
    private static class RowNumberRenderer extends DefaultTableCellRenderer
    {
        public RowNumberRenderer()
        {
            setHorizontalAlignment(JLabel.CENTER);
        }
 
        public Component getTableCellRendererComponent(
            JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column)
        {
            if (table != null)
            {
                JTableHeader header = table.getTableHeader();
 
                if (header != null)
                {
                    setForeground(header.getForeground());
                    setBackground(header.getBackground());
                    setFont(header.getFont());
                }
            }
 
            if (isSelected)
            {
                setFont( getFont().deriveFont(Font.BOLD) );
            }
 
            setText((value == null) ? "" : value.toString());
            setBorder(UIManager.getBorder("TableHeader.cellBorder"));
 
            return this;
        }
    }
}
 

위와 같이 달랑 public class RowNumberTable extends JTable

JTable 을 상속 받은놈이 전부였다.

You can use the RowNumberTable in your program with code like the following…

다음과 같은 코드를 사용하여 프로그램에서 RowNumberTable을 사용할 수 있습니다.

JTable mainTable = new JTable(...);
JScrollPane scrollPane = new JScrollPane(mainTable);
JTable rowTable = new RowNumberTable(mainTable);
scrollPane.setRowHeaderView(rowTable);
scrollPane.setCorner(JScrollPane.UPPER_LEFT_CORNER,
    rowTable.getTableHeader());

which will generate a table looking something like…

테이블을 생성합니다.

구글 번역기 돌리니 저런식으로 어케 어케 쓰라는데

지금 보니 소스가 보이긴하는데 

당시엔 뭔소린지 당췌 몰라서 1시간가량 삽질하다가 소스를 첨부한다

RowNumberTable.java 과는 별개로 class 를 하나더 만들었다

RowHeaderExample.java

// Example from http://www.crionics.com/products/opensource/faq/swing_ex/SwingExamples.html
/* (swing1.1beta3) */
import java.awt.BorderLayout;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
 
import javax.swing.AbstractListModel;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.ListModel;
import javax.swing.table.DefaultTableModel;
 
 
public class RowHeaderExample extends JFrame {
 
    public RowHeaderExample() {
        super("Row Header Example");
        setSize(300, 150);
 
        ListModel lm = new AbstractListModel() {
            String headers[] = { "a", "2", "c", "d", "e", "f", "g", "h", "i" };
 
            public int getSize() {
                return headers.length;
            }
 
            public Object getElementAt(int index) {
                return headers[index];
            }
        };
        
        String colNames[] = {"A","B","C","D","E","F","G","H","I","J"};
        
        Object data[][];
        data = new Object[10][10];
        for(int i=0 ; i<10 ; i++) {
            for(int j=0 ; j<10 ; j++) {
                data[i][j] = String.valueOf(i) + " " + String.valueOf(j);
            }
        }
        
        
        DefaultTableModel dm = new DefaultTableModel(data, colNames) {
            public boolean isCellEditable(int rowIndex, int mColindex) {
                return false;
            }
        };
        JTable table = new JTable(dm);
        table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
        RowNumberTable rowNumberTable = new RowNumberTable(table);
 
//        JList rowHeader = new JList(lm);
//        rowHeader.setFixedCellWidth(50);
//
//        rowHeader.setFixedCellHeight(table.getRowHeight() + table.getRowMargin());
        // + table.getIntercellSpacing().height);
        //rowHeader.setCellRenderer(new RowHeaderRenderer(table));
 
        JScrollPane scroll = new JScrollPane(table);
        scroll.setRowHeaderView(rowNumberTable);
        getContentPane().add(scroll, BorderLayout.CENTER);
    }
 
    public static void main(String[] args) {
        RowHeaderExample framwlrmae = new RowHeaderExample();
        framwlrmae.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
        framwlrmae.setVisible(true);
    }
}

뭐 ... 불필요한 소스도 있고 해서 정리가 필요하다

가장 큰 문제는 문제는 

https://docs.oracle.com/javase/7/docs/api/javax/swing/table/DefaultTableModel.html

여기도 나와있듯이 

아 18 나는 data 만 넘겨주고 싶은데

인자로 해더도 받아쳐먹고 있다

걍 count 만 넘기면 안이런다

아주 깔끔하게 엑셀마냥 A, B, C ... 찍어준다

아 근데 왜 data 를 넣어주면 안찍어주냐고!

해서 ...

하나 만들어야 할듯 하다

어쩨꺼나 이건 다음 숙제 ~

끝