Interface ListSelectionModel
- All Known Implementing Classes:
DefaultListSelectionModel
public interface ListSelectionModel
This interface represents the current state of the selection for any of the components that display a list of values with stable indices. The selection is modeled as a set of intervals, each interval represents a contiguous range of selected list elements. The methods for modifying the set of selected intervals all take a pair of indices, index0 and index1, that represent a closed interval, i.e. the interval includes both index0 and index1.
- Since:
- 1.2
- See Also:
DefaultListSelectionModel
Field Summary
Modifier and Type | Field | Description |
---|---|---|
static int | MULTIPLE_INTERVAL_SELECTION | A value for the selectionMode property: select one or more contiguous ranges of indices at a time. |
static int | SINGLE_INTERVAL_SELECTION | A value for the selectionMode property: select one contiguous range of indices at a time. |
static int | SINGLE_SELECTION | A value for the selectionMode property: select one list index at a time. |
Method Summary
Modifier and Type | Method | Description |
---|---|---|
void | addListSelectionListener(ListSelectionListener x) | Add a listener to the list that's notified each time a change to the selection occurs. |
void | addSelectionInterval(int index0,
int index1) | Changes the selection to be the set union of the current selection and the indices between |
void | clearSelection() | Change the selection to the empty set. |
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(). |
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. |
default int[] | getSelectedIndices() | Returns an array of all of the selected indices in the selection model, in increasing order. |
default int | getSelectedItemsCount() | Returns the number of selected items. |
int | getSelectionMode() | Returns the current selection mode. |
boolean | getValueIsAdjusting() | Returns |
void | insertIndexInterval(int index,
int length,
boolean before) | Insert |
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 |
void | removeListSelectionListener(ListSelectionListener x) | Remove a listener from the list that's notified each time a change to the selection occurs. |
void | removeSelectionInterval(int index0,
int index1) | Changes the selection to be the set difference of the current selection and the indices between |
void | setAnchorSelectionIndex(int index) | Set the anchor selection index. |
void | setLeadSelectionIndex(int index) | Set the lead selection index. |
void | setSelectionInterval(int index0,
int index1) | Changes the selection to be between |
void | setSelectionMode(int selectionMode) | Sets the selection mode. |
void | setValueIsAdjusting(boolean valueIsAdjusting) | Sets the |
Field Detail
SINGLE_SELECTION
static final int SINGLE_SELECTION
A value for the selectionMode property: select one list index at a time.
- See Also:
-
setSelectionMode(int)
, Constant Field Values
SINGLE_INTERVAL_SELECTION
static final int SINGLE_INTERVAL_SELECTION
A value for the selectionMode property: select one contiguous range of indices at a time.
- See Also:
-
setSelectionMode(int)
, Constant Field Values
MULTIPLE_INTERVAL_SELECTION
static final int MULTIPLE_INTERVAL_SELECTION
A value for the selectionMode property: select one or more contiguous ranges of indices at a time.
- See Also:
-
setSelectionMode(int)
, Constant Field Values
Method Detail
setSelectionInterval
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.
- Parameters:
-
index0
- one end of the interval. -
index1
- other end of the interval - See Also:
addListSelectionListener(javax.swing.event.ListSelectionListener)
addSelectionInterval
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. index0
doesn't have to be less than or equal to index1
.
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 the selection.
If this represents a change to the current selection, then each ListSelectionListener
is notified of the change.
- Parameters:
-
index0
- one end of the interval. -
index1
- other end of the interval - See Also:
-
addListSelectionListener(javax.swing.event.ListSelectionListener)
,setSelectionInterval(int, int)
removeSelectionInterval
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.
- Parameters:
-
index0
- one end of the interval. -
index1
- other end of the interval - See Also:
addListSelectionListener(javax.swing.event.ListSelectionListener)
getMinSelectionIndex
int getMinSelectionIndex()
Returns the first selected index or -1 if the selection is empty.
- Returns:
- the first selected index or -1 if the selection is empty.
getMaxSelectionIndex
int getMaxSelectionIndex()
Returns the last selected index or -1 if the selection is empty.
- Returns:
- the last selected index or -1 if the selection is empty.
isSelectedIndex
boolean isSelectedIndex(int index)
Returns true if the specified index is selected.
- Parameters:
-
index
- an index - Returns:
-
true
if the specified index is selected
getAnchorSelectionIndex
int getAnchorSelectionIndex()
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.
- Returns:
- the anchor selection index
- See Also:
-
getLeadSelectionIndex()
,setSelectionInterval(int, int)
,addSelectionInterval(int, int)
setAnchorSelectionIndex
void setAnchorSelectionIndex(int index)
Set the anchor selection index.
- Parameters:
-
index
- the anchor selection index - See Also:
getAnchorSelectionIndex()
getLeadSelectionIndex
int getLeadSelectionIndex()
Return the second index argument from the most recent call to setSelectionInterval(), addSelectionInterval() or removeSelectionInterval().
- Returns:
- the lead selection index.
- See Also:
-
getAnchorSelectionIndex()
,setSelectionInterval(int, int)
,addSelectionInterval(int, int)
setLeadSelectionIndex
void setLeadSelectionIndex(int index)
Set the lead selection index.
- Parameters:
-
index
- the lead selection index - See Also:
getLeadSelectionIndex()
clearSelection
void clearSelection()
Change the selection to the empty set. If this represents a change to the current selection then notify each ListSelectionListener.
isSelectionEmpty
boolean isSelectionEmpty()
Returns true if no indices are selected.
- Returns:
-
true
if no indices are selected.
insertIndexInterval
void insertIndexInterval(int index, int length, boolean before)
Insert length
indices beginning before/after index
. This is typically called to sync the selection model with a corresponding change in the data model.
- Parameters:
-
index
- the beginning of the interval -
length
- the length of the interval -
before
- iftrue
, interval inserts before theindex
, otherwise, interval inserts after theindex
removeIndexInterval
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.
- Parameters:
-
index0
- the beginning of the interval -
index1
- the end of the interval
setValueIsAdjusting
void setValueIsAdjusting(boolean valueIsAdjusting)
Sets the valueIsAdjusting
property, which indicates whether or not upcoming selection changes should be considered part of a single change. The value of this property is used to initialize the valueIsAdjusting
property of the ListSelectionEvent
s that are generated.
For example, if the selection is being updated in response to a user drag, this property can be set to true
when the drag is initiated and set to false
when the drag is finished. During the drag, listeners receive events with a valueIsAdjusting
property set to true
. At the end of the drag, when the change is finalized, listeners receive an event with the value set to false
. Listeners can use this pattern if they wish to update only when a change has been finalized.
Setting this property to true
begins a series of changes that is to be considered part of a single change. When the property is changed back to false
, an event is sent out characterizing the entire selection change (if there was one), with the event's valueIsAdjusting
property set to false
.
- Parameters:
-
valueIsAdjusting
- the new value of the property - See Also:
-
getValueIsAdjusting()
,ListSelectionEvent.getValueIsAdjusting()
getValueIsAdjusting
boolean getValueIsAdjusting()
Returns true
if the selection is undergoing a series of changes.
- Returns:
- true if the selection is undergoing a series of changes
- See Also:
setValueIsAdjusting(boolean)
setSelectionMode
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
andaddSelectionInterval
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 likesetSelectionInterval
(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.
- Parameters:
-
selectionMode
- the selection mode - Throws:
-
IllegalArgumentException
- if the selection mode isn't one of those allowed - See Also:
getSelectionMode()
getSelectionMode
int getSelectionMode()
Returns the current selection mode.
- Returns:
- the current selection mode
- See Also:
setSelectionMode(int)
addListSelectionListener
void addListSelectionListener(ListSelectionListener x)
Add a listener to the list that's notified each time a change to the selection occurs.
- Parameters:
-
x
- the ListSelectionListener - See Also:
-
removeListSelectionListener(javax.swing.event.ListSelectionListener)
,setSelectionInterval(int, int)
,addSelectionInterval(int, int)
,removeSelectionInterval(int, int)
,clearSelection()
,insertIndexInterval(int, int, boolean)
,removeIndexInterval(int, int)
removeListSelectionListener
void removeListSelectionListener(ListSelectionListener x)
Remove a listener from the list that's notified each time a change to the selection occurs.
- Parameters:
-
x
- the ListSelectionListener - See Also:
addListSelectionListener(javax.swing.event.ListSelectionListener)
getSelectedIndices
default int[] getSelectedIndices()
Returns an array of all of the selected indices in the selection model, in increasing order.
- Implementation Requirements:
- The default implementation iterates from minimum selected index
getMinSelectionIndex()
to maximum selected indexgetMaxSelectionIndex()
and returns the selected indicesisSelectedIndex(int)
in a newly allocated int array. - Returns:
- all of the selected indices, in increasing order, or an empty array if nothing is selected
- Since:
- 11
- See Also:
-
removeSelectionInterval(int, int)
,addListSelectionListener(javax.swing.event.ListSelectionListener)
getSelectedItemsCount
default int getSelectedItemsCount()
Returns the number of selected items.
- Implementation Requirements:
- The default implementation iterates from minimum selected index
getMinSelectionIndex()
to maximum selected indexgetMaxSelectionIndex()
and returns the number of selected indicesisSelectedIndex(int)
- Returns:
- the number of selected items, 0 if no items are selected
- Since:
- 11