Module java.desktop
Package javax.swing.tree

Interface TreeSelectionModel

All Known Implementing Classes:
DefaultTreeSelectionModel, JTree.EmptySelectionModel
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 contiguous 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 Details

    • SINGLE_TREE_SELECTION

      static final int SINGLE_TREE_SELECTION
      Selection can only contain one path at a time.
      See Also:

    • CONTIGUOUS_TREE_SELECTION

      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:

    • DISCONTIGUOUS_TREE_SELECTION

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

  • Method Details

    • setSelectionMode

      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.

      Parameters:
      mode - selection mode to be set

    • getSelectionMode

      int getSelectionMode()
      Returns the current selection mode, one of SINGLE_TREE_SELECTION, CONTIGUOUS_TREE_SELECTION or DISCONTIGUOUS_TREE_SELECTION.
      Returns:
      the current selection mode

    • setSelectionPath

      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

      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

      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

      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.
      Parameters:
      paths - the new paths to add to the current selection

    • removeSelectionPath

      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

      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

      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.
      Returns:
      the first path in the selection

    • getSelectionPaths

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

    • getSelectionCount

      int getSelectionCount()
      Returns the number of paths that are selected.
      Returns:
      the number of paths that are selected

    • isPathSelected

      boolean isPathSelected(TreePath path)
      Returns true if the path, path, is in the current selection.
      Parameters:
      path - the path to be loked for
      Returns:
      whether the path is in the current selection

    • isSelectionEmpty

      boolean isSelectionEmpty()
      Returns true if the selection is currently empty.
      Returns:
      whether the selection is currently empty

    • clearSelection

      void clearSelection()
      Empties the current selection. If this represents a change in the current selection, the selection listeners are notified.

    • setRowMapper

      void setRowMapper(RowMapper newMapper)
      Sets the RowMapper instance. This instance is used to determine the row for a particular TreePath.
      Parameters:
      newMapper - RowMapper to be set

    • getRowMapper

      RowMapper getRowMapper()
      Returns the RowMapper instance that is able to map a TreePath to a row.
      Returns:
      the RowMapper instance that is able to map a TreePath to a row

    • getSelectionRows

      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.
      Returns:
      all of the currently selected rows

    • getMinSelectionRow

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

    • getMaxSelectionRow

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

    • isRowSelected

      boolean isRowSelected(int row)
      Returns true if the row identified by row is selected.
      Parameters:
      row - row to check
      Returns:
      whether the row is selected

    • resetRowSelection

      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

      int getLeadSelectionRow()
      Returns the lead selection index. That is the last index that was added.
      Returns:
      the lead selection index

    • getLeadSelectionPath

      TreePath getLeadSelectionPath()
      Returns the last path that was added. This may differ from the leadSelectionPath property maintained by the JTree.
      Returns:
      the last path that was added

    • addPropertyChangeListener

      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

      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

      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

      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