TreeSelectionModel (Java 2 Platform SE v1.4.1) - JDK 5 Documentation v1.4.1, Java 2 SDK 英文文档

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Java^TM 2 Platform
Std. Ed. v1.4.1

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javax.swing.tree
Interface TreeSelectionModel

All Known Implementing Classes:: DefaultTreeSelectionModel

public interface TreeSelectionModel

This interface represents the current state of the selection for the tree component. For information and examples of using tree selection models, see How to Use Trees in The Java Tutorial.

The state of the tree selection is characterized by a set of TreePaths, and optionally a set of integers. The mapping from TreePath to integer is done by way of an instance of RowMapper. It is not necessary for a TreeSelectionModel to have a RowMapper to correctly operate, but without a RowMapper getSelectionRows will return null.

A TreeSelectionModel can be configured to allow only one path (SINGLE_TREE_SELECTION) a number of continguous paths (CONTIGUOUS_TREE_SELECTION) or a number of discontiguous paths (DISCONTIGUOUS_TREE_SELECTION). A RowMapper is used to determine if TreePaths are contiguous. In the absence of a RowMapper CONTIGUOUS_TREE_SELECTION and DISCONTIGUOUS_TREE_SELECTION behave the same, that is they allow any number of paths to be contained in the TreeSelectionModel.

For a selection model of CONTIGUOUS_TREE_SELECTION any time the paths are changed (setSelectionPath, addSelectionPath ...) the TreePaths are again checked to make they are contiguous. A check of the TreePaths can also be forced by invoking resetRowSelection. How a set of discontiguous TreePaths is mapped to a contiguous set is left to implementors of this interface to enforce a particular policy.

Implementations should combine duplicate TreePaths that are added to the selection. For example, the following code

   TreePath[] paths = new TreePath[] { treePath, treePath };
   treeSelectionModel.setSelectionPaths(paths);

should result in only one path being selected: treePath, and not two copies of treePath.

The lead TreePath is the last path that was added (or set). The lead row is then the row that corresponds to the TreePath as determined from the RowMapper.

Field Summary

static int CONTIGUOUS_TREE_SELECTION
          Selection can only be contiguous.

static int DISCONTIGUOUS_TREE_SELECTION
          Selection can contain any number of items that are not necessarily contiguous.

static int SINGLE_TREE_SELECTION
          Selection can only contain one path at a time.

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.

void clearSelection()
          Empties the current selection.

TreePath getLeadSelectionPath()
          Returns the last path that was added.

int getLeadSelectionRow()
          Returns the lead selection index.

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.

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 current selection mode, one of SINGLE_TREE_SELECTION, CONTIGUOUS_TREE_SELECTION or DISCONTIGUOUS_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.

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.

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 TreePaths 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[] paths)
          Sets the selection to path.

Field Detail

SINGLE_TREE_SELECTION

public static final int SINGLE_TREE_SELECTION

Selection can only contain one path at a time.

See Also:: Constant Field Values

CONTIGUOUS_TREE_SELECTION

public static final int CONTIGUOUS_TREE_SELECTION

Selection can only be contiguous. This will only be enforced if a RowMapper instance is provided. That is, if no RowMapper is set this behaves the same as DISCONTIGUOUS_TREE_SELECTION.

See Also:: Constant Field Values

DISCONTIGUOUS_TREE_SELECTION

public static final int DISCONTIGUOUS_TREE_SELECTION

Selection can contain any number of items that are not necessarily contiguous.

See Also:: Constant Field Values

Method Detail

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.

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.

getSelectionMode

public int getSelectionMode()

Returns the current selection mode, one of SINGLE_TREE_SELECTION, CONTIGUOUS_TREE_SELECTION or DISCONTIGUOUS_TREE_SELECTION.

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.

Parameters:: path - new path to select

setSelectionPaths

public void setSelectionPaths(TreePath[] paths)

Sets the selection to path. If this represents a change, then the TreeSelectionListeners are notified. If paths is null, this has the same effect as invoking clearSelection.

Parameters:: paths - 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.

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.

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.

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 method has no effect if paths is null.

Parameters:: paths - the path to remove from the selection

getSelectionPath

public TreePath getSelectionPath()

Returns the first path in the selection. How first is defined is up to implementors, and may not necessarily be the TreePath with the smallest integer value as determined from the RowMapper.

getSelectionPaths

public TreePath[] getSelectionPaths()

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

getSelectionCount

public int getSelectionCount()

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.

isSelectionEmpty

public boolean isSelectionEmpty()

Returns true if 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.

setRowMapper

public void setRowMapper(RowMapper newMapper)

Sets the RowMapper instance. This instance is used to determine the row for a particular TreePath.

getRowMapper

public RowMapper getRowMapper()

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

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.

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.

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.

isRowSelected

public boolean isRowSelected(int row)

Returns true if the row identified by row is selected.

resetRowSelection

public void resetRowSelection()

Updates this object's mapping from TreePaths 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.

getLeadSelectionRow

public int getLeadSelectionRow()

Returns the lead selection index. That is the last index that was added.

getLeadSelectionPath

public TreePath getLeadSelectionPath()

Returns the last path that was added. This may differ from the leadSelectionPath property maintained by the JTree.

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.

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.

Parameters:: listener - the PropertyChangeListener to be removed

addTreeSelectionListener

public void addTreeSelectionListener(TreeSelectionListener x)

Adds x to the list of listeners that are notified each time the set of selected TreePaths changes.

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.

Parameters:: x - the listener to remove