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77 lines
2.3 KiB
77 lines
2.3 KiB
/*
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* Copyright (c) 1997, 2013, 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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package javax.swing.tree;
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import java.awt.Component;
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import javax.swing.JTree;
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/**
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* Defines the requirements for an object that displays a tree node.
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* See <a
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href="https://docs.oracle.com/javase/tutorial/uiswing/components/tree.html">How to Use Trees</a>
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* in <em>The Java Tutorial</em>
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* for an example of implementing a tree cell renderer
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* that displays custom icons.
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*
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* @author Rob Davis
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* @author Ray Ryan
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* @author Scott Violet
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*/
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public interface TreeCellRenderer {
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/**
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* Sets the value of the current tree cell to <code>value</code>.
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* If <code>selected</code> is true, the cell will be drawn as if
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* selected. If <code>expanded</code> is true the node is currently
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* expanded and if <code>leaf</code> is true the node represents a
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* leaf and if <code>hasFocus</code> is true the node currently has
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* focus. <code>tree</code> is the <code>JTree</code> the receiver is being
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* configured for. Returns the <code>Component</code> that the renderer
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* uses to draw the value.
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* <p>
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* The <code>TreeCellRenderer</code> is also responsible for rendering the
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* the cell representing the tree's current DnD drop location if
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* it has one. If this renderer cares about rendering
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* the DnD drop location, it should query the tree directly to
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* see if the given row represents the drop location:
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* <pre>
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* JTree.DropLocation dropLocation = tree.getDropLocation();
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* if (dropLocation != null
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* && dropLocation.getChildIndex() == -1
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* && tree.getRowForPath(dropLocation.getPath()) == row) {
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*
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* // this row represents the current drop location
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* // so render it specially, perhaps with a different color
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* }
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* </pre>
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*
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* @return the <code>Component</code> that the renderer uses to draw the value
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*/
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Component getTreeCellRendererComponent(JTree tree, Object value,
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boolean selected, boolean expanded,
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boolean leaf, int row, boolean hasFocus);
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}
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