sortheaderrenderer.java

文件上传的java例子

package wjhk.jupload.filepanel;

import java.awt.Component;
import javax.swing.Icon;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.JTableHeader;

public class SortHeaderRenderer extends DefaultTableCellRenderer {
  public Icon NONSORTED =
      new SortArrowIcon(SortArrowIcon.NONE);
  public Icon ASCENDING =
      new SortArrowIcon(SortArrowIcon.ASCENDING);
  public Icon DECENDING =
      new SortArrowIcon(SortArrowIcon.DECENDING);

  public SortHeaderRenderer() {
    setHorizontalTextPosition(LEFT);
    setHorizontalAlignment(CENTER);
  }

  public Component getTableCellRendererComponent(
      JTable table, Object value, boolean isSelected,
      boolean hasFocus, int row, int col) {
    int index = -1;
    boolean ascending = true;
    if (table instanceof FilePanelJTable) {
      FilePanelJTable sortTable = (FilePanelJTable) table;
      index = sortTable.getSortedColumnIndex();
      ascending = sortTable.isSortedColumnAscending();
    }
    if (table != null) {
      JTableHeader header = table.getTableHeader();
      if (header != null) {
        setForeground(header.getForeground());
        setBackground(header.getBackground());
        setFont(header.getFont());
      }
    }
    Icon icon = ascending ? ASCENDING : DECENDING;
    setIcon(col == index ? icon : NONSORTED);
    setText( (value == null) ? "" : value.toString());
    setBorder(UIManager.getBorder("TableHeader.cellBorder"));
    return this;
  }
}