javax.swing
Class DefaultListSelectionModel

java.lang.Object
  |
  +--javax.swing.DefaultListSelectionModel

All Implemented Interfaces:

Cloneable, ListSelectionModel, Serializable

public class DefaultListSelectionModel

extends Object

implements ListSelectionModel, Cloneable, Serializable

Default data model for list selections.

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^TM has been added to the java.beans package. Please see XMLEncoder.

See Also:

ListSelectionModel

Field Summary

protected boolean	leadAnchorNotificationEnabled
protected EventListenerList	listenerList

Fields inherited from interface javax.swing.ListSelectionModel

MULTIPLE_INTERVAL_SELECTION, SINGLE_INTERVAL_SELECTION, SINGLE_SELECTION

Constructor Summary

DefaultListSelectionModel()

Method Summary

void	addListSelectionListener(ListSelectionListener l) Add a listener to the list that's notified each time a change to the selection occurs.
void	addSelectionInterval(int index0, int index1) Change the selection to be the set union of the current selection and the indices between index0 and index1 inclusive.
void	clearSelection() Change the selection to the empty set.
Object	clone() Returns a clone of this selection model with the same selection.
protected void	fireValueChanged(boolean isAdjusting) Notifies listeners that we have ended a series of adjustments.
protected void	fireValueChanged(int firstIndex, int lastIndex) Notifies ListSelectionListeners that the value of the selection, in the closed interval firstIndex, lastIndex, has changed.
protected void	fireValueChanged(int firstIndex, int lastIndex, boolean isAdjusting)
int	getAnchorSelectionIndex() Return the first index argument from the most recent call to setSelectionInterval(), addSelectionInterval() or removeSelectionInterval().
int	getLeadSelectionIndex() Return the second index argument from the most recent call to setSelectionInterval(), addSelectionInterval() or removeSelectionInterval().
EventListener[]	getListeners(Class listenerType) Returns an array of all the objects currently registered as FooListeners upon this model.
ListSelectionListener[]	getListSelectionListeners() Returns an array of all the list selection listeners registered on this DefaultListSelectionModel.
int	getMaxSelectionIndex() Returns the last selected index or -1 if the selection is empty.
int	getMinSelectionIndex() Returns the first selected index or -1 if the selection is empty.
int	getSelectionMode() Returns the selection mode.
boolean	getValueIsAdjusting() Returns true if the value is undergoing a series of changes.
void	insertIndexInterval(int index, int length, boolean before) Insert length indices beginning before/after index.
boolean	isLeadAnchorNotificationEnabled() Returns the value of the leadAnchorNotificationEnabled flag.
boolean	isSelectedIndex(int index) Returns true if the specified index is selected.
boolean	isSelectionEmpty() Returns true if no indices are selected.
void	removeIndexInterval(int index0, int index1) Remove the indices in the interval index0,index1 (inclusive) from the selection model.
void	removeListSelectionListener(ListSelectionListener l) Remove a listener from the list that's notified each time a change to the selection occurs.
void	removeSelectionInterval(int index0, int index1) Change the selection to be the set difference of the current selection and the indices between index0 and index1 inclusive.
void	setAnchorSelectionIndex(int anchorIndex) Set the anchor selection index, leaving all selection values unchanged.
void	setLeadAnchorNotificationEnabled(boolean flag) Sets the value of the leadAnchorNotificationEnabled flag.
void	setLeadSelectionIndex(int leadIndex) Sets the lead selection index, ensuring that values between the anchor and the new lead are either all selected or all deselected.
void	setSelectionInterval(int index0, int index1) Change the selection to be between index0 and index1 inclusive.
void	setSelectionMode(int selectionMode) Sets the selection mode.
void	setValueIsAdjusting(boolean isAdjusting) This property is true if upcoming changes to the value of the model should be considered a single event.
String	toString() Returns a string that displays and identifies this object's properties.

Methods inherited from class java.lang.Object

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

Field Detail

listenerList

protected EventListenerList listenerList

leadAnchorNotificationEnabled

protected boolean leadAnchorNotificationEnabled

Constructor Detail

DefaultListSelectionModel

public DefaultListSelectionModel()

Method Detail

getMinSelectionIndex

public int getMinSelectionIndex()

Description copied from interface: ListSelectionModel

Returns the first selected index or -1 if the selection is empty.

Specified by:

getMinSelectionIndex in interface ListSelectionModel

getMaxSelectionIndex

public int getMaxSelectionIndex()

Description copied from interface: ListSelectionModel

Returns the last selected index or -1 if the selection is empty.

Specified by:

getMaxSelectionIndex in interface ListSelectionModel

getValueIsAdjusting

public boolean getValueIsAdjusting()

Description copied from interface: ListSelectionModel

Returns true if the value is undergoing a series of changes.

Specified by:

getValueIsAdjusting in interface ListSelectionModel

Returns:

true if the value is currently adjusting

See Also:

ListSelectionModel.setValueIsAdjusting(boolean)

getSelectionMode

public int getSelectionMode()

Returns the selection mode.

Specified by:

getSelectionMode in interface ListSelectionModel

Returns:

one of the these values:

• SINGLE_SELECTION
• SINGLE_INTERVAL_SELECTION
• MULTIPLE_INTERVAL_SELECTION

See Also:

getSelectionMode()

setSelectionMode

public void setSelectionMode(int selectionMode)

Sets the selection mode. The default is MULTIPLE_INTERVAL_SELECTION.

Specified by:

setSelectionMode in interface ListSelectionModel

Parameters:

selectionMode - one of three values:

• SINGLE_SELECTION
• SINGLE_INTERVAL_SELECTION
• MULTIPLE_INTERVAL_SELECTION

Throws:

IllegalArgumentException - if selectionMode is not one of the legal values shown above

See Also:

setSelectionMode(int)

isSelectedIndex

public boolean isSelectedIndex(int index)

Description copied from interface: ListSelectionModel

Returns true if the specified index is selected.

Specified by:

isSelectedIndex in interface ListSelectionModel

isSelectionEmpty

public boolean isSelectionEmpty()

Description copied from interface: ListSelectionModel

Returns true if no indices are selected.

Specified by:

isSelectionEmpty in interface ListSelectionModel

addListSelectionListener

public void addListSelectionListener(ListSelectionListener l)

Description copied from interface: ListSelectionModel

Add a listener to the list that's notified each time a change to the selection occurs.

Specified by:

addListSelectionListener in interface ListSelectionModel

See Also:

ListSelectionModel.removeListSelectionListener(javax.swing.event.ListSelectionListener), ListSelectionModel.setSelectionInterval(int, int), ListSelectionModel.addSelectionInterval(int, int), ListSelectionModel.removeSelectionInterval(int, int), ListSelectionModel.clearSelection(), ListSelectionModel.insertIndexInterval(int, int, boolean), ListSelectionModel.removeIndexInterval(int, int)

removeListSelectionListener

public void removeListSelectionListener(ListSelectionListener l)

Description copied from interface: ListSelectionModel

Remove a listener from the list that's notified each time a change to the selection occurs.

Specified by:

removeListSelectionListener in interface ListSelectionModel

See Also:

ListSelectionModel.addListSelectionListener(javax.swing.event.ListSelectionListener)

getListSelectionListeners

public ListSelectionListener[] getListSelectionListeners()

Returns an array of all the list selection listeners registered on this DefaultListSelectionModel.

Returns:

all of this model's ListSelectionListeners or an empty array if no list selection listeners are currently registered

Since:

1.4

See Also:

addListSelectionListener(javax.swing.event.ListSelectionListener), removeListSelectionListener(javax.swing.event.ListSelectionListener)

fireValueChanged

protected void fireValueChanged(boolean isAdjusting)

Notifies listeners that we have ended a series of adjustments.

fireValueChanged

protected void fireValueChanged(int firstIndex,
                                int lastIndex)

Notifies ListSelectionListeners that the value of the selection, in the closed interval firstIndex, lastIndex, has changed.

fireValueChanged

protected void fireValueChanged(int firstIndex,
                                int lastIndex,
                                boolean isAdjusting)

Parameters:

firstIndex - the first index in the interval

lastIndex - the last index in the interval

isAdjusting - true if this is the final change in a series of adjustments

See Also:

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 DefaultListSelectionModel instance m for its list selection listeners with the following code:

ListSelectionListener[] lsls = (ListSelectionListener[])(m.getListeners(ListSelectionListener.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 model, 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:

getListSelectionListeners()

setLeadAnchorNotificationEnabled

public void setLeadAnchorNotificationEnabled(boolean flag)

Sets the value of the leadAnchorNotificationEnabled flag.

See Also:

isLeadAnchorNotificationEnabled()

isLeadAnchorNotificationEnabled

public boolean isLeadAnchorNotificationEnabled()

Returns the value of the leadAnchorNotificationEnabled flag. When leadAnchorNotificationEnabled is true the model generates notification events with bounds that cover all the changes to the selection plus the changes to the lead and anchor indices. Setting the flag to false causes a narrowing of the event's bounds to include only the elements that have been selected or deselected since the last change. Either way, the model continues to maintain the lead and anchor variables internally. The default is true.

Returns:

the value of the leadAnchorNotificationEnabled flag

See Also:

setLeadAnchorNotificationEnabled(boolean)

clearSelection

public void clearSelection()

Description copied from interface: ListSelectionModel

Change the selection to the empty set. If this represents a change to the current selection then notify each ListSelectionListener.

Specified by:

clearSelection in interface ListSelectionModel

See Also:

ListSelectionModel.addListSelectionListener(javax.swing.event.ListSelectionListener)

setSelectionInterval

public void setSelectionInterval(int index0,
                                 int index1)

Description copied from interface: ListSelectionModel

Change the selection to be between index0 and index1 inclusive. If this represents a change to the current selection, then notify each ListSelectionListener. Note that index0 doesn't have to be less than or equal to index1.

Specified by:

setSelectionInterval in interface ListSelectionModel

Parameters:

index0 - one end of the interval.

index1 - other end of the interval

See Also:

ListSelectionModel.addListSelectionListener(javax.swing.event.ListSelectionListener)

addSelectionInterval

public void addSelectionInterval(int index0,
                                 int index1)

Description copied from interface: ListSelectionModel

Change the selection to be the set union of the current selection and the indices between index0 and index1 inclusive. If this represents a change to the current selection, then notify each ListSelectionListener. Note that index0 doesn't have to be less than or equal to index1.

Specified by:

addSelectionInterval in interface ListSelectionModel

Parameters:

index0 - one end of the interval.

index1 - other end of the interval

See Also:

ListSelectionModel.addListSelectionListener(javax.swing.event.ListSelectionListener)

removeSelectionInterval

public void removeSelectionInterval(int index0,
                                    int index1)

Description copied from interface: ListSelectionModel

Change the selection to be the set difference of the current selection and the indices between index0 and index1 inclusive. If this represents a change to the current selection, then notify each ListSelectionListener. Note that index0 doesn't have to be less than or equal to index1.

Specified by:

removeSelectionInterval in interface ListSelectionModel

Parameters:

index0 - one end of the interval.

index1 - other end of the interval

See Also:

ListSelectionModel.addListSelectionListener(javax.swing.event.ListSelectionListener)

insertIndexInterval

public void insertIndexInterval(int index,
                                int length,
                                boolean before)

Insert length indices beginning before/after index. If the value at index is itself selected and the selection mode is not SINGLE_SELECTION, set all of the newly inserted items as selected. Otherwise leave them unselected. This method is typically called to sync the selection model with a corresponding change in the data model.

Specified by:

insertIndexInterval in interface ListSelectionModel

removeIndexInterval

public void removeIndexInterval(int index0,
                                int index1)

Remove the indices in the interval index0,index1 (inclusive) from the selection model. This is typically called to sync the selection model width a corresponding change in the data model. Note that (as always) index0 need not be <= index1.

Specified by:

removeIndexInterval in interface ListSelectionModel

setValueIsAdjusting

public void setValueIsAdjusting(boolean isAdjusting)

Description copied from interface: ListSelectionModel

This property is true if upcoming changes to the value of the model should be considered a single event. For example if the model is being updated in response to a user drag, the value of the valueIsAdjusting property will be set to true when the drag is initiated and be set to false when the drag is finished. This property allows listeners to to update only when a change has been finalized, rather than always handling all of the intermediate values.

Specified by:

setValueIsAdjusting in interface ListSelectionModel

Parameters:

isAdjusting - The new value of the property.

See Also:

ListSelectionModel.getValueIsAdjusting()

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 selection model with the same selection. listenerLists are not duplicated.

Overrides:

clone in class Object

Returns:

a clone of this instance.

Throws:

CloneNotSupportedException - if the selection model does not both (a) implement the Cloneable interface and (b) define a clone method.

See Also:

Cloneable

getAnchorSelectionIndex

public int getAnchorSelectionIndex()

Description copied from interface: ListSelectionModel

Return the first index argument from the most recent call to setSelectionInterval(), addSelectionInterval() or removeSelectionInterval(). The most recent index0 is considered the "anchor" and the most recent index1 is considered the "lead". Some interfaces display these indices specially, e.g. Windows95 displays the lead index with a dotted yellow outline.

Specified by:

getAnchorSelectionIndex in interface ListSelectionModel

See Also:

ListSelectionModel.getLeadSelectionIndex(), ListSelectionModel.setSelectionInterval(int, int), ListSelectionModel.addSelectionInterval(int, int)

getLeadSelectionIndex

public int getLeadSelectionIndex()

Description copied from interface: ListSelectionModel

Return the second index argument from the most recent call to setSelectionInterval(), addSelectionInterval() or removeSelectionInterval().

Specified by:

getLeadSelectionIndex in interface ListSelectionModel

See Also:

ListSelectionModel.getAnchorSelectionIndex(), ListSelectionModel.setSelectionInterval(int, int), ListSelectionModel.addSelectionInterval(int, int)

setAnchorSelectionIndex

public void setAnchorSelectionIndex(int anchorIndex)

Set the anchor selection index, leaving all selection values unchanged. If leadAnchorNotificationEnabled is true, send a notification covering the old and new anchor cells.

Specified by:

setAnchorSelectionIndex in interface ListSelectionModel

See Also:

getAnchorSelectionIndex(), setLeadSelectionIndex(int)

setLeadSelectionIndex

public void setLeadSelectionIndex(int leadIndex)

Sets the lead selection index, ensuring that values between the anchor and the new lead are either all selected or all deselected. If the value at the anchor index is selected, first clear all the values in the range [anchor, oldLeadIndex], then select all the values values in the range [anchor, newLeadIndex], where oldLeadIndex is the old leadIndex and newLeadIndex is the new one.

If the value at the anchor index is not selected, do the same thing in reverse selecting values in the old range and deslecting values in the new one.

Generate a single event for this change and notify all listeners. For the purposes of generating minimal bounds in this event, do the operation in a single pass; that way the first and last index inside the ListSelectionEvent that is broadcast will refer to cells that actually changed value because of this method. If, instead, this operation were done in two steps the effect on the selection state would be the same but two events would be generated and the bounds around the changed values would be wider, including cells that had been first cleared only to later be set.

This method can be used in the mouseDragged method of a UI class to extend a selection.

Specified by:

setLeadSelectionIndex in interface ListSelectionModel

See Also:

getLeadSelectionIndex(), setAnchorSelectionIndex(int)