Alignment date parts in JTable column formatted in propotional font

问题

I need to make the date parts (dd, MMMM, yyyy) to be vertically aligned. I asked a question at Fixed length of month and day in date format? to insert padding letters, but I found that it doesn't help in case of proportional font (the width of the letters are different). For example, with Lucida Fax font:

Making different labels for different date parts is considering but it's too manual. It's hard to make the text wrapped if the column width is small....
Thanks

回答1:

note as for all Renderers (excluding preparedRenderer)you have to/be sure that you have to call that after any column/row changes in JTable

TableColumnModel m = myTable.getColumnModel();
m.getColumn(5).setCellRenderer(new SubstDateRenderer());

here you can set BackGround, ForeGround for TableCell

import java.text.SimpleDateFormat;
import java.util.Date;
import javax.swing.table.DefaultTableCellRenderer;

public class SubstDateRenderer extends DefaultTableCellRenderer {

    private static final long serialVersionUID = 1L;
    private Date dateValue;
    private SimpleDateFormat sdfNewValue = new SimpleDateFormat("dd.MMMM.yyyy");
    private String sdfNewValueString = "";

    public SubstDateRenderer() {// formating TableCell
        super();
        setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
    }

    @Override
    public void setValue(Object value) {
        if ((value != null) && (value instanceof Date)) {
            dateValue = (Date) value;
            sdfNewValueString = sdfNewValue.format(dateValue);
            value = sdfNewValueString;
        }
        super.setValue(value);
    }
}

回答2:

As suggested by @mKorbel, a suitable TableCellRenderer is the right choice, but you may have to override paintComponent() and render the text using the graphics context's FontMetrics as shown here.

If numeric months are acceptable, most proportionally-spaced fonts give digit glyphs the same constant advance.

回答3:

Thanks for your answers. I found for myself a solution that uses JTextPane as a TableCellRenderer, then define the tabstop values, and use tabs in formatting date. It seems ok for my requirement and also have other features of normal text field such as word wrapping...

来源：https://stackoverflow.com/questions/6517373/alignment-date-parts-in-jtable-column-formatted-in-propotional-font

标签

java

swing

jtable

date-format

tablecellrenderer