net.namekdev.entity_tracker.ui.utils.DefaultTableHeaderCellRenderer Maven / Gradle / Ivy
package net.namekdev.entity_tracker.ui.utils;
import java.awt.Component;
import java.util.List;
import javax.swing.Icon;
import javax.swing.JTable;
import javax.swing.RowSorter;
import javax.swing.RowSorter.SortKey;
import javax.swing.UIManager;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.JTableHeader;
/**
* A default cell renderer for a JTableHeader.
*
* DefaultTableHeaderCellRenderer attempts to provide identical behavior to the
* renderer which the Swing subsystem uses by default, the Sun proprietary
* class sun.swing.table.DefaultTableCellHeaderRenderer.
*
* To apply any desired customization, DefaultTableHeaderCellRenderer may be
* suitably extended.
*
* @author Darryl
*/
public class DefaultTableHeaderCellRenderer extends DefaultTableCellRenderer {
/**
* Constructs a DefaultTableHeaderCellRenderer.
*
* The horizontal alignment and text position are set as appropriate to a
* table header cell, and the opaque property is set to false.
*/
public DefaultTableHeaderCellRenderer() {
setHorizontalAlignment(CENTER);
setHorizontalTextPosition(LEFT);
setVerticalAlignment(BOTTOM);
setOpaque(false);
}
/**
* Returns the default table header cell renderer.
*
* If the column is sorted, the approapriate icon is retrieved from the
* current Look and Feel, and a border appropriate to a table header cell
* is applied.
*
* Subclasses may overide this method to provide custom content or
* formatting.
*
* @param table the JTable.
* @param value the value to assign to the header cell
* @param isSelected This parameter is ignored.
* @param hasFocus This parameter is ignored.
* @param row This parameter is ignored.
* @param column the column of the header cell to render
* @return the default table header cell renderer
*/
@Override
public Component getTableCellRendererComponent(JTable table, Object value,
boolean isSelected, boolean hasFocus, int row, int column) {
super.getTableCellRendererComponent(table, value,
isSelected, hasFocus, row, column);
JTableHeader tableHeader = table.getTableHeader();
if (tableHeader != null) {
setForeground(tableHeader.getForeground());
}
setIcon(getIcon(table, column));
setBorder(UIManager.getBorder("TableHeader.cellBorder"));
return this;
}
/**
* Overloaded to return an icon suitable to the primary sorted column, or null if
* the column is not the primary sort key.
*
* @param table the JTable.
* @param column the column index.
* @return the sort icon, or null if the column is unsorted.
*/
protected Icon getIcon(JTable table, int column) {
SortKey sortKey = getSortKey(table, column);
if (sortKey != null && table.convertColumnIndexToView(sortKey.getColumn()) == column) {
switch (sortKey.getSortOrder()) {
case ASCENDING:
return UIManager.getIcon("Table.ascendingSortIcon");
case DESCENDING:
return UIManager.getIcon("Table.descendingSortIcon");
}
}
return null;
}
/**
* Returns the current sort key, or null if the column is unsorted.
*
* @param table the table
* @param column the column index
* @return the SortKey, or null if the column is unsorted
*/
protected SortKey getSortKey(JTable table, int column) {
RowSorter rowSorter = table.getRowSorter();
if (rowSorter == null) {
return null;
}
List sortedColumns = rowSorter.getSortKeys();
if (sortedColumns.size() > 0) {
return (SortKey) sortedColumns.get(0);
}
return null;
}
}