25 package javax.swing.tree; 26 27 import java.awt.Component; 28 import javax.swing.JTree; 29 30 /** 31 * Defines the requirements for an object that displays a tree node. 32 * See <a 33 href="http://docs.oracle.com/javase/tutorial/uiswing/components/tree.html">How to Use Trees</a> 34 * in <em>The Java Tutorial</em> 35 * for an example of implementing a tree cell renderer 36 * that displays custom icons. 37 * 38 * @author Rob Davis 39 * @author Ray Ryan 40 * @author Scott Violet 41 */ 42 public interface TreeCellRenderer { 43 44 /** 45 * Sets the value of the current tree cell to <code>value</code>. 46 * If <code>selected</code> is true, the cell will be drawn as if 47 * selected. If <code>expanded</code> is true the node is currently 48 * expanded and if <code>leaf</code> is true the node represents a 49 * leaf and if <code>hasFocus</code> is true the node currently has 50 * focus. <code>tree</code> is the <code>JTree</code> the receiver is being 51 * configured for. Returns the <code>Component</code> that the renderer 52 * uses to draw the value. 53 * <p> 54 * The <code>TreeCellRenderer</code> is also responsible for rendering the 55 * the cell representing the tree's current DnD drop location if 56 * it has one. If this renderer cares about rendering 57 * the DnD drop location, it should query the tree directly to 58 * see if the given row represents the drop location: 59 * <pre> 60 * JTree.DropLocation dropLocation = tree.getDropLocation(); 61 * if (dropLocation != null 62 * && dropLocation.getChildIndex() == -1 63 * && tree.getRowForPath(dropLocation.getPath()) == row) { 64 * 65 * // this row represents the current drop location 66 * // so render it specially, perhaps with a different color 67 * } 68 * </pre> 69 * 70 * @param tree the receiver is being configured for 71 * @param value the value to render 72 * @param selected whether node is selected 73 * @param expanded whether node is expanded 74 * @param leaf whether node is a lead node | 25 package javax.swing.tree; 26 27 import java.awt.Component; 28 import javax.swing.JTree; 29 30 /** 31 * Defines the requirements for an object that displays a tree node. 32 * See <a 33 href="http://docs.oracle.com/javase/tutorial/uiswing/components/tree.html">How to Use Trees</a> 34 * in <em>The Java Tutorial</em> 35 * for an example of implementing a tree cell renderer 36 * that displays custom icons. 37 * 38 * @author Rob Davis 39 * @author Ray Ryan 40 * @author Scott Violet 41 */ 42 public interface TreeCellRenderer { 43 44 /** 45 * Sets the value of the current tree cell to {@code value}. 46 * If {@code selected} is true, the cell will be drawn as if 47 * selected. If {@code expanded} is true the node is currently 48 * expanded and if {@code leaf} is true the node represents a 49 * leaf and if {@code hasFocus} is true the node currently has 50 * focus. {@code tree} is the {@code JTree} the receiver is being 51 * configured for. Returns the {@code Component} that the renderer 52 * uses to draw the value. 53 * <p> 54 * The {@code TreeCellRenderer} is also responsible for rendering the 55 * the cell representing the tree's current DnD drop location if 56 * it has one. If this renderer cares about rendering 57 * the DnD drop location, it should query the tree directly to 58 * see if the given row represents the drop location: 59 * <pre> 60 * JTree.DropLocation dropLocation = tree.getDropLocation(); 61 * if (dropLocation != null 62 * && dropLocation.getChildIndex() == -1 63 * && tree.getRowForPath(dropLocation.getPath()) == row) { 64 * 65 * // this row represents the current drop location 66 * // so render it specially, perhaps with a different color 67 * } 68 * </pre> 69 * 70 * @param tree the receiver is being configured for 71 * @param value the value to render 72 * @param selected whether node is selected 73 * @param expanded whether node is expanded 74 * @param leaf whether node is a lead node |