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Class DefaultTreeSelectionModel

java.lang.Object

javax.swing.tree.DefaultTreeSelectionModel

All Implemented Interfaces:: Serializable, Cloneable, 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 JavaBeans has been added to the java.beans package. Please see XMLEncoder.

See Also:

Field Summary

Modifier and Type	Field	Description
`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 final 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 declared in interface javax.swing.tree.TreeSelectionModel

CONTIGUOUS_TREE_SELECTION, DISCONTIGUOUS_TREE_SELECTION, SINGLE_TREE_SELECTION

Constructor Summary

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

Method Summary

Modifier and Type	Method	Description
`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 `TreePath`s 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.
`<T extends EventListener> T[]`	`getListeners(Class<T> listenerType)`	Returns an array of all the objects currently registered as `FooListener`s 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 selection.
`int[]`	`getSelectionRows()`	Returns the selection in terms of rows.
`TreeSelectionListener[]`	`getTreeSelectionListeners()`	Returns an array of all the tree selection listeners registered on this model.
`protected void`	`insureRowContinuity()`	Makes sure the currently selected `TreePath`s 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)`	Deprecated. As of JDK version 1.7
`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.
`String`	`toString()`	Returns a string that displays and identifies this object's properties.
`protected void`	`updateLeadIndex()`	Updates the leadIndex instance variable.

Methods declared in class java.lang.Object

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

Field Details

SELECTION_MODE_PROPERTY

public static final String SELECTION_MODE_PROPERTY

Property name for selectionMode.

See Also:

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 Details

DefaultTreeSelectionModel

public DefaultTreeSelectionModel()

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

Method Details

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
Parameters:: newMapper - RowMapper to be set

getRowMapper

public RowMapper getRowMapper()

Returns the RowMapper instance that is able to map a TreePath to a row.

Specified by:: getRowMapper in interface TreeSelectionModel
Returns:: the RowMapper instance that is able to map a TreePath to a row

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
Parameters:: mode - selection mode to be set

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
Returns:: the current selection mode

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. Whether the supplied paths are taken as the new selection depends upon the selection mode. If the supplied array is null, or empty, the selection is cleared. If the selection mode is SINGLE_TREE_SELECTION, only the first path in pPaths is used. If the selection mode is CONTIGUOUS_TREE_SELECTION and the supplied paths are not contiguous, then only the first path in pPaths is used. If the selection mode is DISCONTIGUOUS_TREE_SELECTION, then all paths are used.

All null paths in pPaths are ignored.

If this represents a change, all registered TreeSelectionListeners are notified.

The lead path is set to the last unique path.

The paths returned from getSelectionPaths are in the same order as those supplied to this method.

Specified by:: setSelectionPaths in interface TreeSelectionModel
Parameters:: pPaths - the 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
Returns:: the first path in the selection

getSelectionPaths

public TreePath[] getSelectionPaths()

Returns the selection.

Specified by:: getSelectionPaths in interface TreeSelectionModel
Returns:: the selection

getSelectionCount

public int getSelectionCount()

Returns the number of paths that are selected.

Specified by:: getSelectionCount in interface TreeSelectionModel
Returns:: the number of paths that are selected

isPathSelected

public boolean isPathSelected(TreePath path)

Returns true if the path, path, is in the current selection.

Specified by:: isPathSelected in interface TreeSelectionModel
Parameters:: path - the path to be loked for
Returns:: whether the path is in the current selection

isSelectionEmpty

public boolean isSelectionEmpty()

Returns true if the selection is currently empty.

Specified by:: isSelectionEmpty in interface TreeSelectionModel
Returns:: whether the selection is currently empty

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:

fireValueChanged

protected void fireValueChanged(TreeSelectionEvent e)

Notifies all listeners that are registered for tree selection events on this object.

Parameters:

e - the event that characterizes the change

See Also:

getListeners

public <T extends EventListener> T[] getListeners(Class<T> 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.

Type Parameters:

T - the listener type

Parameters:

listenerType - the type of listeners requested

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:

getSelectionRows

public int[] getSelectionRows()

Returns the selection in terms of rows. There is not necessarily a one-to-one mapping between the TreePaths returned from getSelectionPaths and this method. In particular, if a TreePath is not viewable (the


 RowMapper

returns -1 for the row corresponding to the TreePath), then the corresponding row is not included in the returned array. For example, if the selection consists of two paths, A and B, with A at row 10, and B not currently viewable, then this method returns an array with the single entry 10.

Specified by:: getSelectionRows in interface TreeSelectionModel
Returns:: the selection in terms of rows

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
Returns:: the smallest value obtained from the RowMapper for the current set of selected TreePaths

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
Returns:: the largest value obtained from the RowMapper for the current set of selected TreePaths

isRowSelected

public boolean isRowSelected(int row)

Returns true if the row identified by row is selected.

Specified by:: isRowSelected in interface TreeSelectionModel
Parameters:: row - row to check
Returns:: whether the row is selected

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
Returns:: the lead selection index

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
Returns:: the last path that was added

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:

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, that is, when sorted all the rows are in order with no gaps. If the selection isn't contiguous, the selection is reset to contain the first set, when sorted, of contiguous rows.

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.

Parameters:: paths - array of paths to check
Returns:: whether 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.

Parameters:: paths - array of TreePaths to check
Returns:: whether the particular set of TreePaths can be added

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.

Parameters:: paths - array of TreePath to check
Returns:: whether the paths can be removed without breaking the continuity of the model

notifyPathChange

@Deprecated protected void notifyPathChange(Vector<?> changedPaths, TreePath oldLeadSelection)

Deprecated.

As of JDK version 1.7

Notifies listeners of a change in path. changePaths should contain instances of PathPlaceHolder.

Parameters:: changedPaths - the vector of the changed paths; oldLeadSelection - the old selection path

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 compatibility.

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:

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https://docs.oracle.com/en/java/javase/21/docs/api/java.desktop/javax/swing/tree/DefaultTreeSelectionModel.html