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javax.swing

Interface ListCellRenderer<E>

Contents
  • Type Parameters:
    E - the type of values this renderer can be used for
    All Known Implementing Classes:
    BasicComboBoxRenderer, BasicComboBoxRenderer.UIResource, DefaultListCellRenderer, DefaultListCellRenderer.UIResource, MetalFileChooserUI.FileRenderer, MetalFileChooserUI.FilterComboBoxRenderer

    public interface ListCellRenderer<E>
    Identifies components that can be used as "rubber stamps" to paint the cells in a JList. For example, to use a JLabel as a ListCellRenderer, you would write something like this: 
     class MyCellRenderer extends JLabel implements ListCellRenderer<Object> {
     public MyCellRenderer() {
         setOpaque(true);
     }

     public Component getListCellRendererComponent(JList<?> list,
                                                   Object value,
                                                   int index,
                                                   boolean isSelected,
                                                   boolean cellHasFocus) {

         setText(value.toString());

         Color background;
         Color foreground;

         // check if this cell represents the current DnD drop location
         JList.DropLocation dropLocation = list.getDropLocation();
         if (dropLocation != null
                 && !dropLocation.isInsert()
                 && dropLocation.getIndex() == index) {

             background = Color.BLUE;
             foreground = Color.WHITE;

         // check if this cell is selected
         } else if (isSelected) {
             background = Color.RED;
             foreground = Color.WHITE;

         // unselected, and not the DnD drop location
         } else {
             background = Color.WHITE;
             foreground = Color.BLACK;
         };

         setBackground(background);
         setForeground(foreground);

         return this;
     }
 }
    See Also:
    JList, DefaultListCellRenderer
    • Method Detail
      • getListCellRendererComponent 
        Component getListCellRendererComponent(JList<? extends E> list,
                                     E value,
                                     int index,
                                     boolean isSelected,
                                     boolean cellHasFocus)
        Return a component that has been configured to display the specified value. That component's paint method is then called to "render" the cell. If it is necessary to compute the dimensions of a list because the list cells do not have a fixed size, this method is called to generate a component on which getPreferredSize can be invoked.
        Parameters:
        list - The JList we're painting.
        value - The value returned by list.getModel().getElementAt(index).
        index - The cells index.
        isSelected - True if the specified cell was selected.
        cellHasFocus - True if the specified cell has the focus.
        Returns:
        A component whose paint() method will render the specified value.
        See Also:
        JList, ListSelectionModel, ListModel
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