Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Class TreeUI - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

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Java^TM 2 Platform
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javax.swing.plaf
Class TreeUI

java.lang.Object
  |
  +--javax.swing.plaf.ComponentUI
        |
        +--javax.swing.plaf.TreeUI

Direct Known Subclasses:: BasicTreeUI, MultiTreeUI

public abstract class TreeUI
extends ComponentUI

Pluggable look and feel interface for JTree.

Constructor Summary

TreeUI()


Method Summary

abstract void cancelEditing(JTree tree)
          Cancels the current editing session.

abstract TreePath getClosestPathForLocation(JTree tree, int x, int y)
          Returns the path to the node that is closest to x,y.

abstract TreePath getEditingPath(JTree tree)
          Returns the path to the element that is being edited.

abstract Rectangle getPathBounds(JTree tree, TreePath path)
          Returns the Rectangle enclosing the label portion that the last item in path will be drawn into.

abstract TreePath getPathForRow(JTree tree, int row)
          Returns the path for passed in row.

abstract int getRowCount(JTree tree)
          Returns the number of rows that are being displayed.

abstract int getRowForPath(JTree tree, TreePath path)
          Returns the row that the last item identified in path is visible at.

abstract boolean isEditing(JTree tree)
          Returns true if the tree is being edited.

abstract void startEditingAtPath(JTree tree, TreePath path)
          Selects the last item in path and tries to edit it.

abstract boolean stopEditing(JTree tree)
          Stops the current editing session.

Methods inherited from class javax.swing.plaf.ComponentUI

contains, createUI, getAccessibleChild, getAccessibleChildrenCount, getMaximumSize, getMinimumSize, getPreferredSize, installUI, paint, uninstallUI, update

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

TreeUI

public TreeUI()

Method Detail

getPathBounds

public abstract Rectangle getPathBounds(JTree tree,
                                        TreePath path)

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.

getPathForRow

public abstract TreePath getPathForRow(JTree tree,
                                       int row)

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

getRowForPath

public abstract int getRowForPath(JTree tree,
                                  TreePath path)

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.

getRowCount

public abstract int getRowCount(JTree tree)

Returns the number of rows that are being displayed.

getClosestPathForLocation

public abstract TreePath getClosestPathForLocation(JTree tree,
                                                   int x,
                                                   int y)

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.

isEditing

public abstract boolean isEditing(JTree tree)

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

stopEditing

public abstract boolean stopEditing(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.

cancelEditing

public abstract void cancelEditing(JTree tree)

Cancels 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.

startEditingAtPath

public abstract void startEditingAtPath(JTree tree,
                                        TreePath path)

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.

getEditingPath

public abstract TreePath getEditingPath(JTree tree)

Returns the path to the element that is being edited.