E
- the type of values this renderer can be used forBasicComboBoxRenderer
, BasicComboBoxRenderer.UIResource
, DefaultListCellRenderer
, DefaultListCellRenderer.UIResource
, MetalFileChooserUI.FileRenderer
, MetalFileChooserUI.FilterComboBoxRenderer
public interface ListCellRenderer<E>
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;
}
}
Modifier and Type | Method | Description |
---|---|---|
Component |
getListCellRendererComponent |
Return a component that has been configured to display the specified value. |
Component getListCellRendererComponent(JList<? extends E> list, E value, int index, boolean isSelected, boolean cellHasFocus)
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.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.
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Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
Various third party code in OpenJDK is licensed under different licenses (see Debian package).
Java and OpenJDK are trademarks or registered trademarks of Oracle and/or its affiliates.
https://docs.oracle.com/en/java/javase/21/docs/api/java.desktop/javax/swing/ListCellRenderer.html