Module java.desktop
Package javax.swing

## Class DefaultListSelectionModel

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

- All Implemented Interfaces:
    `Serializable`, `Cloneable`, `ListSelectionModel`

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

  Since:
    1.2
  See Also:
    `ListSelectionModel`

- - ### Field Summary

    Fields
    Modifier and Type | Field | Description
    --- | --- | ---
    `protected boolean` | `leadAnchorNotificationEnabled` | Whether or not the lead anchor notification is enabled.
    `protected EventListenerList` | `listenerList` | The list of listeners.

    - ### Fields declared in interface javax.swing.ListSelectionModel

      `MULTIPLE_INTERVAL_SELECTION, SINGLE_INTERVAL_SELECTION, SINGLE_SELECTION`

  - ### Constructor Summary

    Constructors
    Constructor | Description
    --- | ---
    `DefaultListSelectionModel()` |

  - ### Method Summary

    Modifier and Type | Method | Description
    --- | --- | ---
    `void` | `addSelectionInterval​(int index0, int index1)` | Changes the selection to be the set union of the current selection and the indices between `index0` and `index1` inclusive.
    `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)` |
    `<T extends EventListener> T[]` | `getListeners​(Class<T> listenerType)` | Returns an array of all the objects currently registered as `FooListener`s upon this model.
    `ListSelectionListener[]` | `getListSelectionListeners()` | Returns an array of all the list selection listeners registered on this `DefaultListSelectionModel`.
    `void` | `insertIndexInterval​(int index, int length, boolean before)` | Insert length indices beginning before/after index.
    `boolean` | `isLeadAnchorNotificationEnabled()` | Returns the value of the `leadAnchorNotificationEnabled` flag.
    `void` | `moveLeadSelectionIndex​(int leadIndex)` | Set the lead selection index, leaving all selection values unchanged.
    `void` | `removeIndexInterval​(int index0, int index1)` | Remove the indices in the interval index0,index1 (inclusive) from the selection model.
    `void` | `removeSelectionInterval​(int index0, int index1)` | Changes 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)` | Changes the selection to be between `index0` and `index1` inclusive.
    `void` | `setSelectionMode​(int selectionMode)` | Sets the selection mode.
    `String` | `toString()` | Returns a string that displays and identifies this object's properties.

    - ### Methods declared in class java.lang.Object

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

    - ### Methods declared in interface javax.swing.ListSelectionModel

      `addListSelectionListener, clearSelection, getAnchorSelectionIndex, getLeadSelectionIndex, getMaxSelectionIndex, getMinSelectionIndex, getSelectedIndices, getSelectedItemsCount, getSelectionMode, getValueIsAdjusting, isSelectedIndex, isSelectionEmpty, removeListSelectionListener, setValueIsAdjusting`

- - ### Field Detail

    - #### listenerList

          protected EventListenerList listenerList

      The list of listeners.

    - #### leadAnchorNotificationEnabled

          protected boolean leadAnchorNotificationEnabled

      Whether or not the lead anchor notification is enabled.

  - ### Constructor Detail

    - #### DefaultListSelectionModel

          public DefaultListSelectionModel()

  - ### Method Detail

    - #### setSelectionMode

          public void setSelectionMode​(int selectionMode)

      Sets the selection mode. The following list describes the accepted selection modes:
      - `ListSelectionModel.SINGLE_SELECTION` - Only one list index can be selected at a time. In this mode, `setSelectionInterval` and `addSelectionInterval` are equivalent, both replacing the current selection with the index represented by the second argument (the "lead").
      - `ListSelectionModel.SINGLE_INTERVAL_SELECTION` - Only one contiguous interval can be selected at a time. In this mode, `addSelectionInterval` behaves like `setSelectionInterval` (replacing the current selection), unless the given interval is immediately adjacent to or overlaps the existing selection, and can therefore be used to grow it.
      - `ListSelectionModel.MULTIPLE_INTERVAL_SELECTION` - In this mode, there's no restriction on what can be selected.
      Specified by:
        `setSelectionMode` in interface `ListSelectionModel`
      Parameters:
        `selectionMode` - the selection mode
      Throws:
        `IllegalArgumentException` - if the selection mode isn't one of those allowed
      See Also:
        `ListSelectionModel.getSelectionMode()`

    - #### getListSelectionListeners

          public ListSelectionListener[] getListSelectionListeners()

      Returns an array of all the list selection listeners registered on this `DefaultListSelectionModel`.
      Returns:
        all of this model's `ListSelectionListener`s or an empty array if no list selection listeners are currently registered
      Since:
        1.4
      See Also:
        `ListSelectionModel.addListSelectionListener(javax.swing.event.ListSelectionListener)`, `ListSelectionModel.removeListSelectionListener(javax.swing.event.ListSelectionListener)`

    - #### fireValueChanged

          protected void fireValueChanged​(boolean isAdjusting)

      Notifies listeners that we have ended a series of adjustments.
      Parameters:
        `isAdjusting` - true if this is the final change in 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.
      Parameters:
        `firstIndex` - the first index in the interval
        `lastIndex` - the last index in the interval

    - #### 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 <T extends EventListener> T[] getListeners​(Class<T> listenerType)

      Returns an array of all the objects currently registered as `FooListener`s upon this model. `FooListener`s 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.
      Type Parameters:
        `T` - the type of `EventListener` class being requested
      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 `FooListener`s 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.
      Parameters:
        `flag` - boolean value for `leadAnchorNotificationEnabled`
      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.

      Note: It is possible for the lead or anchor to be changed without a change to the selection. Notification of these changes is often important, such as when the new lead or anchor needs to be updated in the view. Therefore, caution is urged when changing the default value.

      Returns:
        the value of the `leadAnchorNotificationEnabled` flag
      See Also:
        `setLeadAnchorNotificationEnabled(boolean)`

    - #### setSelectionInterval

          public void setSelectionInterval​(int index0,
                                           int index1)

      Changes the selection to be between `index0` and `index1` inclusive. `index0` doesn't have to be less than or equal to `index1`.

      In `SINGLE_SELECTION` selection mode, only the second index is used.

      If this represents a change to the current selection, then each `ListSelectionListener` is notified of the change.

      If either index is `-1`, this method does nothing and returns without exception. Otherwise, if either index is less than `-1`, an `IndexOutOfBoundsException` is thrown.

      Specified by:
        `setSelectionInterval` in interface `ListSelectionModel`
      Parameters:
        `index0` - one end of the interval.
        `index1` - other end of the interval
      Throws:
        `IndexOutOfBoundsException` - if either index is less than `-1` (and neither index is `-1`)
      See Also:
        `ListSelectionModel.addListSelectionListener(javax.swing.event.ListSelectionListener)`

    - #### addSelectionInterval

          public void addSelectionInterval​(int index0,
                                           int index1)

      Changes the selection to be the set union of the current selection and the indices between `index0` and `index1` inclusive.

      In `SINGLE_SELECTION` selection mode, this is equivalent to calling `setSelectionInterval`, and only the second index is used. In `SINGLE_INTERVAL_SELECTION` selection mode, this method behaves like `setSelectionInterval`, unless the given interval is immediately adjacent to or overlaps the existing selection, and can therefore be used to grow it.

      If this represents a change to the current selection, then each `ListSelectionListener` is notified of the change. Note that `index0` doesn't have to be less than or equal to `index1`.

      If either index is `-1`, this method does nothing and returns without exception. Otherwise, if either index is less than `-1`, an `IndexOutOfBoundsException` is thrown.

      Specified by:
        `addSelectionInterval` in interface `ListSelectionModel`
      Parameters:
        `index0` - one end of the interval.
        `index1` - other end of the interval
      Throws:
        `IndexOutOfBoundsException` - if either index is less than `-1` (and neither index is `-1`)
      See Also:
        `ListSelectionModel.addListSelectionListener(javax.swing.event.ListSelectionListener)`, `setSelectionInterval(int, int)`

    - #### removeSelectionInterval

          public void removeSelectionInterval​(int index0,
                                              int index1)

      Changes the selection to be the set difference of the current selection and the indices between `index0` and `index1` inclusive. `index0` doesn't have to be less than or equal to `index1`.

      In `SINGLE_INTERVAL_SELECTION` selection mode, if the removal would produce two disjoint selections, the removal is extended through the greater end of the selection. For example, if the selection is `0-10` and you supply indices `5,6` (in any order) the resulting selection is `0-4`.

      If this represents a change to the current selection, then each `ListSelectionListener` is notified of the change.

      If either index is `-1`, this method does nothing and returns without exception. Otherwise, if either index is less than `-1`, an `IndexOutOfBoundsException` is thrown.

      Specified by:
        `removeSelectionInterval` in interface `ListSelectionModel`
      Parameters:
        `index0` - one end of the interval
        `index1` - other end of the interval
      Throws:
        `IndexOutOfBoundsException` - if either index is less than `-1` (and neither index is `-1`)
      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`
      Parameters:
        `index` - the beginning of the interval
        `length` - the length of the interval
        `before` - if `true`, interval inserts before the `index`, otherwise, interval inserts after the `index`

    - #### 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`
      Parameters:
        `index0` - the beginning of the interval
        `index1` - the end of the interval

    - #### 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`

    - #### 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`
      Parameters:
        `anchorIndex` - the anchor selection index
      See Also:
        `ListSelectionModel.getAnchorSelectionIndex()`, `setLeadSelectionIndex(int)`

    - #### moveLeadSelectionIndex

          public void moveLeadSelectionIndex​(int leadIndex)

      Set the lead selection index, leaving all selection values unchanged. If leadAnchorNotificationEnabled is true, send a notification covering the old and new lead cells.
      Parameters:
        `leadIndex` - the new lead selection index
      Since:
        1.5
      See Also:
        `setAnchorSelectionIndex(int)`, `setLeadSelectionIndex(int)`, `ListSelectionModel.getLeadSelectionIndex()`

    - #### 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 deselecting 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`
      Parameters:
        `leadIndex` - the lead selection index
      See Also:
        `ListSelectionModel.getLeadSelectionIndex()`, `setAnchorSelectionIndex(int)`