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package javax.swing.plaf;

import java.awt.Rectangle;
import javax.swing.JTree;
import javax.swing.tree.TreePath;


Pluggable look and feel interface for JTree.

Author:Rob Davis, Scott Violet
/**
 * Pluggable look and feel interface for JTree.
 *
 * @author Rob Davis
 * @author Scott Violet
 */
public abstract class TreeUI extends ComponentUI
{
    
Returns the Rectangle enclosing the label portion that the
last item in path will be drawn into.  Will return null if
any component in path is currently valid.

Params:
  • tree – the JTree for path
  • path – the TreePath identifying the node
Returns:the Rectangle enclosing the label portion that the last item in path will be drawn into, null if any component in path is currently valid.
/**
     * Returns the Rectangle enclosing the label portion that the
     * last item in path will be drawn into.  Will return null if
     * any component in path is currently valid.
     *
     * @param tree the {@code JTree} for {@code path}
     * @param path the {@code TreePath} identifying the node
     * @return the {@code Rectangle} enclosing the label portion that the
     *         last item in path will be drawn into, {@code null} if any
     *         component in path is currently valid.
     */
    public abstract Rectangle getPathBounds(JTree tree, TreePath path);

    
Returns the path for passed in row.  If row is not visible
null is returned.

Params:
  • tree – a JTree object
  • row – an integer specifying a row
Returns:the path for row or null if row is not visible
/**
     * Returns the path for passed in row.  If row is not visible
     * null is returned.
     *
     * @param tree a {@code JTree} object
     * @param row an integer specifying a row
     * @return the {@code path} for {@code row} or {@code null} if {@code row}
     *         is not visible
     */
    public abstract TreePath getPathForRow(JTree tree, int row);

    
Returns the row that the last item identified in path is visible
at.  Will return -1 if any of the elements in path are not
currently visible.

Params:
  • tree – the JTree for path
  • path – the TreePath object to look in
Returns:an integer specifying the row at which the last item identified is visible, -1 if any of the elements in path are not currently visible
/**
     * Returns the row that the last item identified in path is visible
     * at.  Will return -1 if any of the elements in path are not
     * currently visible.
     *
     * @param tree the {@code JTree} for {@code path}
     * @param path the {@code TreePath} object to look in
     * @return an integer specifying the row at which the last item
     *         identified is visible, -1 if any of the elements in
     *         {@code path} are not currently visible
     */
    public abstract int getRowForPath(JTree tree, TreePath path);

    
Returns the number of rows that are being displayed.

Params:
  • tree – the JTree for which to count rows
Returns:an integer specifying the number of row being displayed
/**
     * Returns the number of rows that are being displayed.
     *
     * @param tree the {@code JTree} for which to count rows
     * @return an integer specifying the number of row being displayed
     */
    public abstract int getRowCount(JTree tree);

    
Returns the path to the node that is closest to x,y.  If
there is nothing currently visible this will return null, otherwise
it'll always return a valid path.  If you need to test if the
returned object is exactly at x, y you should get the bounds for
the returned path and test x, y against that.

Params:
  • tree – a JTree object
  • x – an integer giving the number of pixels horizontally from the
       left edge of the display area
  • y – an integer giving the number of pixels vertically from the top
       of the display area, minus any top margin
Returns:the TreePath node closest to x,y or null if there is nothing currently visible
/**
     * Returns the path to the node that is closest to x,y.  If
     * there is nothing currently visible this will return null, otherwise
     * it'll always return a valid path.  If you need to test if the
     * returned object is exactly at x, y you should get the bounds for
     * the returned path and test x, y against that.
     *
     * @param tree a {@code JTree} object
     * @param x an integer giving the number of pixels horizontally from the
     *        left edge of the display area
     * @param y an integer giving the number of pixels vertically from the top
     *        of the display area, minus any top margin
     * @return the {@code TreePath} node closest to {@code x,y} or {@code null}
     *         if there is nothing currently visible
     */
    public abstract TreePath getClosestPathForLocation(JTree tree, int x,
                                                       int y);

    
Returns true if the tree is being edited.  The item that is being
edited can be returned by getEditingPath().

Params:
  • tree – a JTree object
Returns:true if tree is being edited
/**
     * Returns true if the tree is being edited.  The item that is being
     * edited can be returned by getEditingPath().
     *
     * @param tree a {@code JTree} object
     * @return true if {@code tree} is being edited
     */
    public abstract boolean isEditing(JTree tree);

    
Stops the current editing session.  This has no effect if the
tree isn't being edited.  Returns true if the editor allows the
editing session to stop.

Params:
  • tree – a JTree object
Returns:true if the editor allows the editing session to stop
/**
     * Stops the current editing session.  This has no effect if the
     * tree isn't being edited.  Returns true if the editor allows the
     * editing session to stop.
     *
     * @param tree a {@code JTree} object
     * @return true if the editor allows the editing session to stop
     */
    public abstract boolean stopEditing(JTree tree);

    
Cancels the current editing session. This has no effect if the
tree isn't being edited.

Params:
  • tree – a JTree object
/**
     * Cancels the current editing session. This has no effect if the
     * tree isn't being edited.
     *
     * @param tree a {@code JTree} object
     */
    public abstract void cancelEditing(JTree tree);

    
Selects the last item in path and tries to edit it.  Editing will
fail if the CellEditor won't allow it for the selected item.

Params:
  • tree – the JTree being edited
  • path – the TreePath to be edited
/**
     * Selects the last item in path and tries to edit it.  Editing will
     * fail if the CellEditor won't allow it for the selected item.
     *
     * @param tree the {@code JTree} being edited
     * @param path the {@code TreePath} to be edited
     */
    public abstract void startEditingAtPath(JTree tree, TreePath path);

    
Returns the path to the element that is being edited.

Params:
  • tree – the JTree for which to return a path
Returns:a TreePath containing the path to tree
/**
     * Returns the path to the element that is being edited.
     *
     * @param tree the {@code JTree} for which to return a path
     * @return a {@code TreePath} containing the path to {@code tree}
     */
    public abstract TreePath getEditingPath(JTree tree);
}