JavaTM 2 Platform
Std. Ed. v1.4.2

javax.swing.tree
Class DefaultTreeSelectionModel

java.lang.Object
  extended byjavax.swing.tree.DefaultTreeSelectionModel
All Implemented Interfaces:
Cloneable, Serializable, TreeSelectionModel
Direct Known Subclasses:
JTree.EmptySelectionModel

public class DefaultTreeSelectionModel
extends Object
implements Cloneable, Serializable, TreeSelectionModel

Default implementation of TreeSelectionModel. Listeners are notified whenever the paths in the selection change, not the rows. In order to be able to track row changes you may wish to become a listener for expansion events on the tree and test for changes from there.

resetRowSelection is called from any of the methods that update the selected paths. If you subclass any of these methods to filter what is allowed to be selected, be sure and message resetRowSelection if you do not message super.

Warning: Serialized objects of this class will not be compatible with future Swing releases. The current serialization support is appropriate for short term storage or RMI between applications running the same version of Swing. As of 1.4, support for long term storage of all JavaBeansTM has been added to the java.beans package. Please see XMLEncoder.

See Also:
JTree

Field Summary
protected  SwingPropertyChangeSupport changeSupport
          Used to messaged registered listeners.
protected  int leadIndex
          Index of the lead path in selection.
protected  TreePath leadPath
          Last path that was added.
protected  int leadRow
          Lead row.
protected  EventListenerList listenerList
          Event listener list.
protected  DefaultListSelectionModel listSelectionModel
          Handles maintaining the list selection model.
protected  RowMapper rowMapper
          Provides a row for a given path.
protected  TreePath[] selection
          Paths that are currently selected.
static String SELECTION_MODE_PROPERTY
          Property name for selectionMode.
protected  int selectionMode
          Mode for the selection, will be either SINGLE_TREE_SELECTION, CONTIGUOUS_TREE_SELECTION or DISCONTIGUOUS_TREE_SELECTION.
 
Fields inherited from interface javax.swing.tree.TreeSelectionModel
CONTIGUOUS_TREE_SELECTION, DISCONTIGUOUS_TREE_SELECTION, SINGLE_TREE_SELECTION
 
Constructor Summary
DefaultTreeSelectionModel()
          Creates a new instance of DefaultTreeSelectionModel that is empty, with a selection mode of DISCONTIGUOUS_TREE_SELECTION.
 
Method Summary
 void addPropertyChangeListener(PropertyChangeListener listener)
          Adds a PropertyChangeListener to the listener list.
 void addSelectionPath(TreePath path)
          Adds path to the current selection.
 void addSelectionPaths(TreePath[] paths)
          Adds paths to the current selection.
 void addTreeSelectionListener(TreeSelectionListener x)
          Adds x to the list of listeners that are notified each time the set of selected TreePaths changes.
protected  boolean arePathsContiguous(TreePath[] paths)
          Returns true if the paths are contiguous, or this object has no RowMapper.
protected  boolean canPathsBeAdded(TreePath[] paths)
          Used to test if a particular set of TreePaths can be added.
protected  boolean canPathsBeRemoved(TreePath[] paths)
          Returns true if the paths can be removed without breaking the continuity of the model.
 void clearSelection()
          Empties the current selection.
 Object clone()
          Returns a clone of this object with the same selection.
protected  void fireValueChanged(TreeSelectionEvent e)
          Notifies all listeners that are registered for tree selection events on this object.
 TreePath getLeadSelectionPath()
          Returns the last path that was added.
 int getLeadSelectionRow()
          Returns the lead selection index.
 EventListener[] getListeners(Class listenerType)
          Returns an array of all the objects currently registered as FooListeners upon this model.
 int getMaxSelectionRow()
          Returns the largest value obtained from the RowMapper for the current set of selected TreePaths.
 int getMinSelectionRow()
          Returns the smallest value obtained from the RowMapper for the current set of selected TreePaths.
 PropertyChangeListener[] getPropertyChangeListeners()
          Returns an array of all the property change listeners registered on this DefaultTreeSelectionModel.
 RowMapper getRowMapper()
          Returns the RowMapper instance that is able to map a TreePath to a row.
 int getSelectionCount()
          Returns the number of paths that are selected.
 int getSelectionMode()
          Returns the selection mode, one of SINGLE_TREE_SELECTION, DISCONTIGUOUS_TREE_SELECTION or CONTIGUOUS_TREE_SELECTION.
 TreePath getSelectionPath()
          Returns the first path in the selection.
 TreePath[] getSelectionPaths()
          Returns the paths in the selection.
 int[] getSelectionRows()
          Returns all of the currently selected rows.
 TreeSelectionListener[] getTreeSelectionListeners()
          Returns an array of all the tree selection listeners registered on this model.
protected  void insureRowContinuity()
          Makes sure the currently selected TreePaths are valid for the current selection mode.
protected  void insureUniqueness()
          This method is obsolete and its implementation is now a noop.
 boolean isPathSelected(TreePath path)
          Returns true if the path, path, is in the current selection.
 boolean isRowSelected(int row)
          Returns true if the row identified by row is selected.
 boolean isSelectionEmpty()
          Returns true if the selection is currently empty.
protected  void notifyPathChange(Vector changedPaths, TreePath oldLeadSelection)
          Notifies listeners of a change in path.
 void removePropertyChangeListener(PropertyChangeListener listener)
          Removes a PropertyChangeListener from the listener list.
 void removeSelectionPath(TreePath path)
          Removes path from the selection.
 void removeSelectionPaths(TreePath[] paths)
          Removes paths from the selection.
 void removeTreeSelectionListener(TreeSelectionListener x)
          Removes x from the list of listeners that are notified each time the set of selected TreePaths changes.
 void resetRowSelection()
          Updates this object's mapping from TreePath to rows.
 void setRowMapper(RowMapper newMapper)
          Sets the RowMapper instance.
 void setSelectionMode(int mode)
          Sets the selection model, which must be one of SINGLE_TREE_SELECTION, CONTIGUOUS_TREE_SELECTION or DISCONTIGUOUS_TREE_SELECTION.
 void setSelectionPath(TreePath path)
          Sets the selection to path.
 void setSelectionPaths(TreePath[] pPaths)
          Sets the selection to the paths in paths.
 String toString()
          Returns a string that displays and identifies this object's properties.
protected  void updateLeadIndex()
          Updates the leadIndex instance variable.
 
Methods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Field Detail

SELECTION_MODE_PROPERTY

public static final String SELECTION_MODE_PROPERTY
Property name for selectionMode.

See Also:
Constant Field Values

changeSupport

protected SwingPropertyChangeSupport changeSupport
Used to messaged registered listeners.


selection

protected TreePath[] selection
Paths that are currently selected. Will be null if nothing is currently selected.


listenerList

protected EventListenerList listenerList
Event listener list.


rowMapper

protected transient RowMapper rowMapper
Provides a row for a given path.


listSelectionModel

protected DefaultListSelectionModel listSelectionModel
Handles maintaining the list selection model. The RowMapper is used to map from a TreePath to a row, and the value is then placed here.


selectionMode

protected int selectionMode
Mode for the selection, will be either SINGLE_TREE_SELECTION, CONTIGUOUS_TREE_SELECTION or DISCONTIGUOUS_TREE_SELECTION.


leadPath

protected TreePath leadPath
Last path that was added.


leadIndex

protected int leadIndex
Index of the lead path in selection.


leadRow

protected int leadRow
Lead row.

Constructor Detail

DefaultTreeSelectionModel

public DefaultTreeSelectionModel()
Creates a new instance of DefaultTreeSelectionModel that is empty, with a selection mode of DISCONTIGUOUS_TREE_SELECTION.

Method Detail

setRowMapper

public void setRowMapper(RowMapper newMapper)
Sets the RowMapper instance. This instance is used to determine the row for a particular TreePath.

Specified by:
setRowMapper in interface TreeSelectionModel

getRowMapper

public RowMapper getRowMapper()
Returns the RowMapper instance that is able to map a TreePath to a row.

Specified by:
getRowMapper in interface TreeSelectionModel

setSelectionMode

public void setSelectionMode(int mode)
Sets the selection model, which must be one of SINGLE_TREE_SELECTION, CONTIGUOUS_TREE_SELECTION or DISCONTIGUOUS_TREE_SELECTION. If mode is not one of the defined value, DISCONTIGUOUS_TREE_SELECTION is assumed.

This may change the selection if the current selection is not valid for the new mode. For example, if three TreePaths are selected when the mode is changed to SINGLE_TREE_SELECTION, only one TreePath will remain selected. It is up to the particular implementation to decide what TreePath remains selected.

Setting the mode to something other than the defined types will result in the mode becoming DISCONTIGUOUS_TREE_SELECTION.

Specified by:
setSelectionMode in interface TreeSelectionModel

getSelectionMode

public int getSelectionMode()
Returns the selection mode, one of SINGLE_TREE_SELECTION, DISCONTIGUOUS_TREE_SELECTION or CONTIGUOUS_TREE_SELECTION.

Specified by:
getSelectionMode in interface TreeSelectionModel

setSelectionPath

public void setSelectionPath(TreePath path)
Sets the selection to path. If this represents a change, then the TreeSelectionListeners are notified. If path is null, this has the same effect as invoking clearSelection.

Specified by:
setSelectionPath in interface TreeSelectionModel
Parameters:
path - new path to select

setSelectionPaths

public void setSelectionPaths(TreePath[] pPaths)
Sets the selection to the paths in paths. If this represents a change the TreeSelectionListeners are notified. Potentially paths will be held by this object; in other words don't change any of the objects in the array once passed in.

If paths is null, this has the same effect as invoking clearSelection.

The lead path is set to the last path in pPaths.

If the selection mode is CONTIGUOUS_TREE_SELECTION, and adding the new paths would make the selection discontiguous, the selection is reset to the first TreePath in paths.

Specified by:
setSelectionPaths in interface TreeSelectionModel
Parameters:
pPaths - new selection

addSelectionPath

public void addSelectionPath(TreePath path)
Adds path to the current selection. If path is not currently in the selection the TreeSelectionListeners are notified. This has no effect if path is null.

Specified by:
addSelectionPath in interface TreeSelectionModel
Parameters:
path - the new path to add to the current selection

addSelectionPaths

public void addSelectionPaths(TreePath[] paths)
Adds paths to the current selection. If any of the paths in paths are not currently in the selection the TreeSelectionListeners are notified. This has no effect if paths is null.

The lead path is set to the last element in paths.

If the selection mode is CONTIGUOUS_TREE_SELECTION, and adding the new paths would make the selection discontiguous. Then two things can result: if the TreePaths in paths are contiguous, then the selection becomes these TreePaths, otherwise the TreePaths aren't contiguous and the selection becomes the first TreePath in paths.

Specified by:
addSelectionPaths in interface TreeSelectionModel
Parameters:
paths - the new path to add to the current selection

removeSelectionPath

public void removeSelectionPath(TreePath path)
Removes path from the selection. If path is in the selection The TreeSelectionListeners are notified. This has no effect if path is null.

Specified by:
removeSelectionPath in interface TreeSelectionModel
Parameters:
path - the path to remove from the selection

removeSelectionPaths

public void removeSelectionPaths(TreePath[] paths)
Removes paths from the selection. If any of the paths in paths are in the selection the TreeSelectionListeners are notified. This has no effect if paths is null.

Specified by:
removeSelectionPaths in interface TreeSelectionModel
Parameters:
paths - the paths to remove from the selection

getSelectionPath

public TreePath getSelectionPath()
Returns the first path in the selection. This is useful if there if only one item currently selected.

Specified by:
getSelectionPath in interface TreeSelectionModel

getSelectionPaths

public TreePath[] getSelectionPaths()
Returns the paths in the selection. This will return null (or an empty array) if nothing is currently selected.

Specified by:
getSelectionPaths in interface TreeSelectionModel

getSelectionCount

public int getSelectionCount()
Returns the number of paths that are selected.

Specified by:
getSelectionCount in interface TreeSelectionModel

isPathSelected

public boolean isPathSelected(TreePath path)
Returns true if the path, path, is in the current selection.

Specified by:
isPathSelected in interface TreeSelectionModel

isSelectionEmpty

public boolean isSelectionEmpty()
Returns true if the selection is currently empty.

Specified by:
isSelectionEmpty in interface TreeSelectionModel

clearSelection

public void clearSelection()
Empties the current selection. If this represents a change in the current selection, the selection listeners are notified.

Specified by:
clearSelection in interface TreeSelectionModel

addTreeSelectionListener

public void addTreeSelectionListener(TreeSelectionListener x)
Adds x to the list of listeners that are notified each time the set of selected TreePaths changes.

Specified by:
addTreeSelectionListener in interface TreeSelectionModel
Parameters:
x - the new listener to be added

removeTreeSelectionListener

public void removeTreeSelectionListener(TreeSelectionListener x)
Removes x from the list of listeners that are notified each time the set of selected TreePaths changes.

Specified by:
removeTreeSelectionListener in interface TreeSelectionModel
Parameters:
x - the listener to remove

getTreeSelectionListeners

public TreeSelectionListener[] getTreeSelectionListeners()
Returns an array of all the tree selection listeners registered on this model.

Returns:
all of this model's TreeSelectionListeners or an empty array if no tree selection listeners are currently registered
Since:
1.4
See Also:
addTreeSelectionListener(javax.swing.event.TreeSelectionListener), removeTreeSelectionListener(javax.swing.event.TreeSelectionListener)

fireValueChanged

protected void fireValueChanged(TreeSelectionEvent e)
Notifies all listeners that are registered for tree selection events on this object.

See Also:
addTreeSelectionListener(javax.swing.event.TreeSelectionListener), EventListenerList

getListeners

public EventListener[] getListeners(Class listenerType)
Returns an array of all the objects currently registered as FooListeners upon this model. FooListeners are registered using the addFooListener method.

You can specify the listenerType argument with a class literal, such as FooListener.class. For example, you can query a DefaultTreeSelectionModel m for its tree selection listeners with the following code:

TreeSelectionListener[] tsls = (TreeSelectionListener[])(m.getListeners(TreeSelectionListener.class));
If no such listeners exist, this method returns an empty array.

Parameters:
listenerType - the type of listeners requested; this parameter should specify an interface that descends from java.util.EventListener
Returns:
an array of all objects registered as FooListeners on this component, or an empty array if no such listeners have been added
Throws:
ClassCastException - if listenerType doesn't specify a class or interface that implements java.util.EventListener
Since:
1.3
See Also:
getTreeSelectionListeners(), getPropertyChangeListeners()

getSelectionRows

public int[] getSelectionRows()
Returns all of the currently selected rows. This will return null (or an empty array) if there are no selected TreePaths or a RowMapper has not been set. This may return an array of length less that than of the selected TreePaths if some of the rows are not visible (that is the RowMapper returned -1 for the row corresponding to the TreePath).

Specified by:
getSelectionRows in interface TreeSelectionModel

getMinSelectionRow

public int getMinSelectionRow()
Returns the smallest value obtained from the RowMapper for the current set of selected TreePaths. If nothing is selected, or there is no RowMapper, this will return -1.

Specified by:
getMinSelectionRow in interface TreeSelectionModel

getMaxSelectionRow

public int getMaxSelectionRow()
Returns the largest value obtained from the RowMapper for the current set of selected TreePaths. If nothing is selected, or there is no RowMapper, this will return -1.

Specified by:
getMaxSelectionRow in interface TreeSelectionModel

isRowSelected

public boolean isRowSelected(int row)
Returns true if the row identified by row is selected.

Specified by:
isRowSelected in interface TreeSelectionModel

resetRowSelection

public void resetRowSelection()
Updates this object's mapping from TreePath to rows. This should be invoked when the mapping from TreePaths to integers has changed (for example, a node has been expanded).

You do not normally have to call this, JTree and its associated Listeners will invoke this for you. If you are implementing your own View class, then you will have to invoke this.

This will invoke insureRowContinuity to make sure the currently selected TreePaths are still valid based on the selection mode.

Specified by:
resetRowSelection in interface TreeSelectionModel

getLeadSelectionRow

public int getLeadSelectionRow()
Returns the lead selection index. That is the last index that was added.

Specified by:
getLeadSelectionRow in interface TreeSelectionModel

getLeadSelectionPath

public TreePath getLeadSelectionPath()
Returns the last path that was added. This may differ from the leadSelectionPath property maintained by the JTree.

Specified by:
getLeadSelectionPath in interface TreeSelectionModel

addPropertyChangeListener

public void addPropertyChangeListener(PropertyChangeListener listener)
Adds a PropertyChangeListener to the listener list. The listener is registered for all properties.

A PropertyChangeEvent will get fired when the selection mode changes.

Specified by:
addPropertyChangeListener in interface TreeSelectionModel
Parameters:
listener - the PropertyChangeListener to be added

removePropertyChangeListener

public void removePropertyChangeListener(PropertyChangeListener listener)
Removes a PropertyChangeListener from the listener list. This removes a PropertyChangeListener that was registered for all properties.

Specified by:
removePropertyChangeListener in interface TreeSelectionModel
Parameters:
listener - the PropertyChangeListener to be removed

getPropertyChangeListeners

public PropertyChangeListener[] getPropertyChangeListeners()
Returns an array of all the property change listeners registered on this DefaultTreeSelectionModel.

Returns:
all of this model's PropertyChangeListeners or an empty array if no property change listeners are currently registered
Since:
1.4
See Also:
addPropertyChangeListener(java.beans.PropertyChangeListener), removePropertyChangeListener(java.beans.PropertyChangeListener)

insureRowContinuity

protected void insureRowContinuity()
Makes sure the currently selected TreePaths are valid for the current selection mode. If the selection mode is CONTIGUOUS_TREE_SELECTION and a RowMapper exists, this will make sure all the rows are contiguous. If the selection isn't contiguous, the selection is reset to contain the first set of contiguous paths.

If the selection mode is SINGLE_TREE_SELECTION and more than one TreePath is selected, the selection is reset to contain the first path currently selected.


arePathsContiguous

protected boolean arePathsContiguous(TreePath[] paths)
Returns true if the paths are contiguous, or this object has no RowMapper.


canPathsBeAdded

protected boolean canPathsBeAdded(TreePath[] paths)
Used to test if a particular set of TreePaths can be added. This will return true if paths is null (or empty), or this object has no RowMapper, or nothing is currently selected, or the selection mode is DISCONTIGUOUS_TREE_SELECTION, or adding the paths to the current selection still results in a contiguous set of TreePaths.


canPathsBeRemoved

protected boolean canPathsBeRemoved(TreePath[] paths)
Returns true if the paths can be removed without breaking the continuity of the model. This is rather expensive.


notifyPathChange

protected void notifyPathChange(Vector changedPaths,
                                TreePath oldLeadSelection)
Notifies listeners of a change in path. changePaths should contain instances of PathPlaceHolder.


updateLeadIndex

protected void updateLeadIndex()
Updates the leadIndex instance variable.


insureUniqueness

protected void insureUniqueness()
This method is obsolete and its implementation is now a noop. It's still called by setSelectionPaths and addSelectionPaths, but only for backwards compatability.


toString

public String toString()
Returns a string that displays and identifies this object's properties.

Overrides:
toString in class Object
Returns:
a String representation of this object

clone

public Object clone()
             throws CloneNotSupportedException
Returns a clone of this object with the same selection. This method does not duplicate selection listeners and property listeners.

Overrides:
clone in class Object
Returns:
a clone of this instance.
Throws:
CloneNotSupportedException - never thrown by instances of this class
See Also:
Cloneable

JavaTM 2 Platform
Std. Ed. v1.4.2

Submit a bug or feature
For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2003 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.


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