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117 lines
3.1 KiB
117 lines
3.1 KiB
/*
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* Copyright (c) 1997, 2005, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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package javax.swing;
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import java.awt.Component;
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/**
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* Identifies components that can be used as "rubber stamps" to paint
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* the cells in a JList. For example, to use a JLabel as a
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* ListCellRenderer, you would write something like this:
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* <pre>
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* {@code
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* class MyCellRenderer extends JLabel implements ListCellRenderer<Object> {
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* public MyCellRenderer() {
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* setOpaque(true);
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* }
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*
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* public Component getListCellRendererComponent(JList<?> list,
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* Object value,
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* int index,
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* boolean isSelected,
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* boolean cellHasFocus) {
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*
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* setText(value.toString());
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*
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* Color background;
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* Color foreground;
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*
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* // check if this cell represents the current DnD drop location
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* JList.DropLocation dropLocation = list.getDropLocation();
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* if (dropLocation != null
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* && !dropLocation.isInsert()
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* && dropLocation.getIndex() == index) {
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*
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* background = Color.BLUE;
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* foreground = Color.WHITE;
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*
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* // check if this cell is selected
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* } else if (isSelected) {
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* background = Color.RED;
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* foreground = Color.WHITE;
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*
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* // unselected, and not the DnD drop location
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* } else {
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* background = Color.WHITE;
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* foreground = Color.BLACK;
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* };
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*
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* setBackground(background);
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* setForeground(foreground);
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*
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* return this;
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* }
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* }
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* }
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* </pre>
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*
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* @param <E> the type of values this renderer can be used for
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*
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* @see JList
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* @see DefaultListCellRenderer
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*
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* @author Hans Muller
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*/
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public interface ListCellRenderer<E>
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{
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/**
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* Return a component that has been configured to display the specified
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* value. That component's <code>paint</code> method is then called to
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* "render" the cell. If it is necessary to compute the dimensions
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* of a list because the list cells do not have a fixed size, this method
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* is called to generate a component on which <code>getPreferredSize</code>
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* can be invoked.
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*
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* @param list The JList we're painting.
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* @param value The value returned by list.getModel().getElementAt(index).
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* @param index The cells index.
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* @param isSelected True if the specified cell was selected.
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* @param cellHasFocus True if the specified cell has the focus.
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* @return A component whose paint() method will render the specified value.
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*
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* @see JList
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* @see ListSelectionModel
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* @see ListModel
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*/
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Component getListCellRendererComponent(
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JList<? extends E> list,
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E value,
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int index,
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boolean isSelected,
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boolean cellHasFocus);
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}
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