ListCellRenderer (Java 2 Platform SE v1.4.1) - JDK 5 Documentation v1.4.1, Java 2 SDK 英文文档

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Java^TM 2 Platform
Std. Ed. v1.4.1

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javax.swing
Interface ListCellRenderer

All Known Implementing Classes:: BasicComboBoxRenderer, DefaultListCellRenderer

public interface ListCellRenderer

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 {
     public MyCellRenderer() {
         setOpaque(true);
     }
     public Component getListCellRendererComponent(
         JList list,
         Object value,
         int index,
         boolean isSelected,
         boolean cellHasFocus)
     {
         setText(value.toString());
         setBackground(isSelected ? Color.red : Color.white);
         setForeground(isSelected ? Color.white : Color.black);
         return this;
     }
 }

See Also:: JList, DefaultListCellRenderer

Method Summary

Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus)
Return a component that has been configured to display the specified value.

Method Detail

getListCellRendererComponent

public Component getListCellRendererComponent(JList list,
                                              Object 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