Java example source code file (DefaultTreeSelectionModel.java)
The DefaultTreeSelectionModel.java Java example source code
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
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* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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package javax.swing.tree;
import java.beans.PropertyChangeListener;
import java.io.*;
import java.util.ArrayList;
import java.util.BitSet;
import java.util.Enumeration;
import java.util.EventListener;
import java.util.Hashtable;
import java.util.List;
import java.util.Vector;
import javax.swing.event.*;
import javax.swing.DefaultListSelectionModel;
/**
* Default implementation of TreeSelectionModel. Listeners are notified
* whenever
* the paths in the selection change, not the rows. In order
* to be able to track row changes you may wish to become a listener
* for expansion events on the tree and test for changes from there.
* <p>resetRowSelection is called from any of the methods that update
* the selected paths. If you subclass any of these methods to
* filter what is allowed to be selected, be sure and message
* <code>resetRowSelection if you do not message super.
*
* <strong>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 <code>java.beans package.
* Please see {@link java.beans.XMLEncoder}.
*
* @see javax.swing.JTree
*
* @author Scott Violet
*/
@SuppressWarnings("serial")
public class DefaultTreeSelectionModel implements Cloneable, Serializable, TreeSelectionModel
{
/** Property name for selectionMode. */
public static final String SELECTION_MODE_PROPERTY = "selectionMode";
/** Used to messaged registered listeners. */
protected SwingPropertyChangeSupport changeSupport;
/** Paths that are currently selected. Will be null if nothing is
* currently selected. */
protected TreePath[] selection;
/** Event listener list. */
protected EventListenerList listenerList = new EventListenerList();
/** Provides a row for a given path. */
transient protected RowMapper rowMapper;
/** Handles maintaining the list selection model. The RowMapper is used
* to map from a TreePath to a row, and the value is then placed here. */
protected DefaultListSelectionModel listSelectionModel;
/** Mode for the selection, will be either SINGLE_TREE_SELECTION,
* CONTIGUOUS_TREE_SELECTION or DISCONTIGUOUS_TREE_SELECTION.
*/
protected int selectionMode;
/** Last path that was added. */
protected TreePath leadPath;
/** Index of the lead path in selection. */
protected int leadIndex;
/** Lead row. */
protected int leadRow;
/** Used to make sure the paths are unique, will contain all the paths
* in <code>selection.
*/
private Hashtable<TreePath, Boolean> uniquePaths;
private Hashtable<TreePath, Boolean> lastPaths;
private TreePath[] tempPaths;
/**
* Creates a new instance of DefaultTreeSelectionModel that is
* empty, with a selection mode of DISCONTIGUOUS_TREE_SELECTION.
*/
public DefaultTreeSelectionModel() {
listSelectionModel = new DefaultListSelectionModel();
selectionMode = DISCONTIGUOUS_TREE_SELECTION;
leadIndex = leadRow = -1;
uniquePaths = new Hashtable<TreePath, Boolean>();
lastPaths = new Hashtable<TreePath, Boolean>();
tempPaths = new TreePath[1];
}
/**
* Sets the RowMapper instance. This instance is used to determine
* the row for a particular TreePath.
*/
public void setRowMapper(RowMapper newMapper) {
rowMapper = newMapper;
resetRowSelection();
}
/**
* Returns the RowMapper instance that is able to map a TreePath to a
* row.
*/
public RowMapper getRowMapper() {
return rowMapper;
}
/**
* Sets the selection model, which must be one of SINGLE_TREE_SELECTION,
* CONTIGUOUS_TREE_SELECTION or DISCONTIGUOUS_TREE_SELECTION. If mode
* is not one of the defined value,
* <code>DISCONTIGUOUS_TREE_SELECTION is assumed.
* <p>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 <code>SINGLE_TREE_SELECTION,
* only one TreePath will remain selected. It is up to the particular
* implementation to decide what TreePath remains selected.
* <p>
* Setting the mode to something other than the defined types will
* result in the mode becoming <code>DISCONTIGUOUS_TREE_SELECTION.
*/
public void setSelectionMode(int mode) {
int oldMode = selectionMode;
selectionMode = mode;
if(selectionMode != TreeSelectionModel.SINGLE_TREE_SELECTION &&
selectionMode != TreeSelectionModel.CONTIGUOUS_TREE_SELECTION &&
selectionMode != TreeSelectionModel.DISCONTIGUOUS_TREE_SELECTION)
selectionMode = TreeSelectionModel.DISCONTIGUOUS_TREE_SELECTION;
if(oldMode != selectionMode && changeSupport != null)
changeSupport.firePropertyChange(SELECTION_MODE_PROPERTY,
Integer.valueOf(oldMode),
Integer.valueOf(selectionMode));
}
/**
* Returns the selection mode, one of <code>SINGLE_TREE_SELECTION,
* <code>DISCONTIGUOUS_TREE_SELECTION or
* <code>CONTIGUOUS_TREE_SELECTION.
*/
public int getSelectionMode() {
return selectionMode;
}
/**
* Sets the selection to path. If this represents a change, then
* the TreeSelectionListeners are notified. If <code>path is
* null, this has the same effect as invoking <code>clearSelection.
*
* @param path new path to select
*/
public void setSelectionPath(TreePath path) {
if(path == null)
setSelectionPaths(null);
else {
TreePath[] newPaths = new TreePath[1];
newPaths[0] = path;
setSelectionPaths(newPaths);
}
}
/**
* Sets the selection. Whether the supplied paths are taken as the
* new selection depends upon the selection mode. If the supplied
* array is {@code null}, or empty, the selection is cleared. If
* the selection mode is {@code SINGLE_TREE_SELECTION}, only the
* first path in {@code pPaths} is used. If the selection
* mode is {@code CONTIGUOUS_TREE_SELECTION} and the supplied paths
* are not contiguous, then only the first path in {@code pPaths} is
* used. If the selection mode is
* {@code DISCONTIGUOUS_TREE_SELECTION}, then all paths are used.
* <p>
* All {@code null} paths in {@code pPaths} are ignored.
* <p>
* If this represents a change, all registered {@code
* TreeSelectionListener}s are notified.
* <p>
* The lead path is set to the last unique path.
* <p>
* The paths returned from {@code getSelectionPaths} are in the same
* order as those supplied to this method.
*
* @param pPaths the new selection
*/
public void setSelectionPaths(TreePath[] pPaths) {
int newCount, newCounter, oldCount, oldCounter;
TreePath[] paths = pPaths;
if(paths == null)
newCount = 0;
else
newCount = paths.length;
if(selection == null)
oldCount = 0;
else
oldCount = selection.length;
if((newCount + oldCount) != 0) {
if(selectionMode == TreeSelectionModel.SINGLE_TREE_SELECTION) {
/* If single selection and more than one path, only allow
first. */
if(newCount > 1) {
paths = new TreePath[1];
paths[0] = pPaths[0];
newCount = 1;
}
}
else if(selectionMode ==
TreeSelectionModel.CONTIGUOUS_TREE_SELECTION) {
/* If contiguous selection and paths aren't contiguous,
only select the first path item. */
if(newCount > 0 && !arePathsContiguous(paths)) {
paths = new TreePath[1];
paths[0] = pPaths[0];
newCount = 1;
}
}
TreePath beginLeadPath = leadPath;
Vector<PathPlaceHolder> cPaths = new Vector
*
* If no such listeners exist, this method returns an empty array.
*
* @param listenerType the type of listeners requested; this parameter
* should specify an interface that descends from
* <code>java.util.EventListener
* @return an array of all objects registered as
* <code>FooListeners on this component,
* or an empty array if no such
* listeners have been added
* @exception ClassCastException if <code>listenerType
* doesn't specify a class or interface that implements
* <code>java.util.EventListener
*
* @see #getTreeSelectionListeners
* @see #getPropertyChangeListeners
*
* @since 1.3
*/
public <T extends EventListener> T[] getListeners(ClassinsureRowContinuity to make sure
* the currently selected TreePaths are still valid based on the
* selection mode.
*/
public void resetRowSelection() {
listSelectionModel.clearSelection();
if(selection != null && rowMapper != null) {
int aRow;
int validCount = 0;
int[] rows = rowMapper.getRowsForPaths(selection);
for(int counter = 0, maxCounter = selection.length;
counter < maxCounter; counter++) {
aRow = rows[counter];
if(aRow != -1) {
listSelectionModel.addSelectionInterval(aRow, aRow);
}
}
if(leadIndex != -1 && rows != null) {
leadRow = rows[leadIndex];
}
else if (leadPath != null) {
// Lead selection path doesn't have to be in the selection.
tempPaths[0] = leadPath;
rows = rowMapper.getRowsForPaths(tempPaths);
leadRow = (rows != null) ? rows[0] : -1;
}
else {
leadRow = -1;
}
insureRowContinuity();
}
else
leadRow = -1;
}
/**
* Returns the lead selection index. That is the last index that was
* added.
*/
public int getLeadSelectionRow() {
return leadRow;
}
/**
* Returns the last path that was added. This may differ from the
* leadSelectionPath property maintained by the JTree.
*/
public TreePath getLeadSelectionPath() {
return leadPath;
}
/**
* Adds a PropertyChangeListener to the listener list.
* The listener is registered for all properties.
* <p>
* A PropertyChangeEvent will get fired when the selection mode
* changes.
*
* @param listener the PropertyChangeListener to be added
*/
public synchronized void addPropertyChangeListener(
PropertyChangeListener listener) {
if (changeSupport == null) {
changeSupport = new SwingPropertyChangeSupport(this);
}
changeSupport.addPropertyChangeListener(listener);
}
/**
* Removes a PropertyChangeListener from the listener list.
* This removes a PropertyChangeListener that was registered
* for all properties.
*
* @param listener the PropertyChangeListener to be removed
*/
public synchronized void removePropertyChangeListener(
PropertyChangeListener listener) {
if (changeSupport == null) {
return;
}
changeSupport.removePropertyChangeListener(listener);
}
/**
* Returns an array of all the property change listeners
* registered on this <code>DefaultTreeSelectionModel.
*
* @return all of this model's <code>PropertyChangeListeners
* or an empty
* array if no property change listeners are currently registered
*
* @see #addPropertyChangeListener
* @see #removePropertyChangeListener
*
* @since 1.4
*/
public PropertyChangeListener[] getPropertyChangeListeners() {
if (changeSupport == null) {
return new PropertyChangeListener[0];
}
return changeSupport.getPropertyChangeListeners();
}
/**
* Makes sure the currently selected <code>TreePaths are valid
* for the current selection mode.
* If the selection mode is <code>CONTIGUOUS_TREE_SELECTION
* and a <code>RowMapper exists, this will make sure all
* the rows are contiguous, that is, when sorted all the rows are
* in order with no gaps.
* If the selection isn't contiguous, the selection is
* reset to contain the first set, when sorted, of contiguous rows.
* <p>
* If the selection mode is <code>SINGLE_TREE_SELECTION and
* more than one TreePath is selected, the selection is reset to
* contain the first path currently selected.
*/
protected void insureRowContinuity() {
if(selectionMode == TreeSelectionModel.CONTIGUOUS_TREE_SELECTION &&
selection != null && rowMapper != null) {
DefaultListSelectionModel lModel = listSelectionModel;
int min = lModel.getMinSelectionIndex();
if(min != -1) {
for(int counter = min,
maxCounter = lModel.getMaxSelectionIndex();
counter <= maxCounter; counter++) {
if(!lModel.isSelectedIndex(counter)) {
if(counter == min) {
clearSelection();
}
else {
TreePath[] newSel = new TreePath[counter - min];
int selectionIndex[] = rowMapper.getRowsForPaths(selection);
// find the actual selection pathes corresponded to the
// rows of the new selection
for (int i = 0; i < selectionIndex.length; i++) {
if (selectionIndex[i]<counter) {
newSel[selectionIndex[i]-min] = selection[i];
}
}
setSelectionPaths(newSel);
break;
}
}
}
}
}
else if(selectionMode == TreeSelectionModel.SINGLE_TREE_SELECTION &&
selection != null && selection.length > 1) {
setSelectionPath(selection[0]);
}
}
/**
* Returns true if the paths are contiguous,
* or this object has no RowMapper.
*/
protected boolean arePathsContiguous(TreePath[] paths) {
if(rowMapper == null || paths.length < 2)
return true;
else {
BitSet bitSet = new BitSet(32);
int anIndex, counter, min;
int pathCount = paths.length;
int validCount = 0;
TreePath[] tempPath = new TreePath[1];
tempPath[0] = paths[0];
min = rowMapper.getRowsForPaths(tempPath)[0];
for(counter = 0; counter < pathCount; counter++) {
if(paths[counter] != null) {
tempPath[0] = paths[counter];
int[] rows = rowMapper.getRowsForPaths(tempPath);
if (rows == null) {
return false;
}
anIndex = rows[0];
if(anIndex == -1 || anIndex < (min - pathCount) ||
anIndex > (min + pathCount))
return false;
if(anIndex < min)
min = anIndex;
if(!bitSet.get(anIndex)) {
bitSet.set(anIndex);
validCount++;
}
}
}
int maxCounter = validCount + min;
for(counter = min; counter < maxCounter; counter++)
if(!bitSet.get(counter))
return false;
}
return true;
}
/**
* Used to test if a particular set of <code>TreePaths can
* be added. This will return true if <code>paths is null (or
* empty), or this object has no RowMapper, or nothing is currently selected,
* or the selection mode is <code>DISCONTIGUOUS_TREE_SELECTION, or
* adding the paths to the current selection still results in a
* contiguous set of <code>TreePaths.
*/
protected boolean canPathsBeAdded(TreePath[] paths) {
if(paths == null || paths.length == 0 || rowMapper == null ||
selection == null || selectionMode ==
TreeSelectionModel.DISCONTIGUOUS_TREE_SELECTION)
return true;
else {
BitSet bitSet = new BitSet();
DefaultListSelectionModel lModel = listSelectionModel;
int anIndex;
int counter;
int min = lModel.getMinSelectionIndex();
int max = lModel.getMaxSelectionIndex();
TreePath[] tempPath = new TreePath[1];
if(min != -1) {
for(counter = min; counter <= max; counter++) {
if(lModel.isSelectedIndex(counter))
bitSet.set(counter);
}
}
else {
tempPath[0] = paths[0];
min = max = rowMapper.getRowsForPaths(tempPath)[0];
}
for(counter = paths.length - 1; counter >= 0; counter--) {
if(paths[counter] != null) {
tempPath[0] = paths[counter];
int[] rows = rowMapper.getRowsForPaths(tempPath);
if (rows == null) {
return false;
}
anIndex = rows[0];
min = Math.min(anIndex, min);
max = Math.max(anIndex, max);
if(anIndex == -1)
return false;
bitSet.set(anIndex);
}
}
for(counter = min; counter <= max; counter++)
if(!bitSet.get(counter))
return false;
}
return true;
}
/**
* Returns true if the paths can be removed without breaking the
* continuity of the model.
* This is rather expensive.
*/
protected boolean canPathsBeRemoved(TreePath[] paths) {
if(rowMapper == null || selection == null ||
selectionMode == TreeSelectionModel.DISCONTIGUOUS_TREE_SELECTION)
return true;
else {
BitSet bitSet = new BitSet();
int counter;
int pathCount = paths.length;
int anIndex;
int min = -1;
int validCount = 0;
TreePath[] tempPath = new TreePath[1];
int[] rows;
/* Determine the rows for the removed entries. */
lastPaths.clear();
for (counter = 0; counter < pathCount; counter++) {
if (paths[counter] != null) {
lastPaths.put(paths[counter], Boolean.TRUE);
}
}
for(counter = selection.length - 1; counter >= 0; counter--) {
if(lastPaths.get(selection[counter]) == null) {
tempPath[0] = selection[counter];
rows = rowMapper.getRowsForPaths(tempPath);
if(rows != null && rows[0] != -1 && !bitSet.get(rows[0])) {
validCount++;
if(min == -1)
min = rows[0];
else
min = Math.min(min, rows[0]);
bitSet.set(rows[0]);
}
}
}
lastPaths.clear();
/* Make sure they are contiguous. */
if(validCount > 1) {
for(counter = min + validCount - 1; counter >= min;
counter--)
if(!bitSet.get(counter))
return false;
}
}
return true;
}
/**
* Notifies listeners of a change in path. changePaths should contain
* instances of PathPlaceHolder.
*
* @deprecated As of JDK version 1.7
*/
@Deprecated
protected void notifyPathChange(Vector<?> changedPaths,
TreePath oldLeadSelection) {
int cPathCount = changedPaths.size();
boolean[] newness = new boolean[cPathCount];
TreePath[] paths = new TreePath[cPathCount];
PathPlaceHolder placeholder;
for(int counter = 0; counter < cPathCount; counter++) {
placeholder = (PathPlaceHolder) changedPaths.elementAt(counter);
newness[counter] = placeholder.isNew;
paths[counter] = placeholder.path;
}
TreeSelectionEvent event = new TreeSelectionEvent
(this, paths, newness, oldLeadSelection, leadPath);
fireValueChanged(event);
}
/**
* Updates the leadIndex instance variable.
*/
protected void updateLeadIndex() {
if(leadPath != null) {
if(selection == null) {
leadPath = null;
leadIndex = leadRow = -1;
}
else {
leadRow = leadIndex = -1;
for(int counter = selection.length - 1; counter >= 0;
counter--) {
// Can use == here since we know leadPath came from
// selection
if(selection[counter] == leadPath) {
leadIndex = counter;
break;
}
}
}
}
else {
leadIndex = -1;
}
}
/**
* This method is obsolete and its implementation is now a noop. It's
* still called by setSelectionPaths and addSelectionPaths, but only
* for backwards compatibility.
*/
protected void insureUniqueness() {
}
/**
* Returns a string that displays and identifies this
* object's properties.
*
* @return a String representation of this object
*/
public String toString() {
int selCount = getSelectionCount();
StringBuffer retBuffer = new StringBuffer();
int[] rows;
if(rowMapper != null)
rows = rowMapper.getRowsForPaths(selection);
else
rows = null;
retBuffer.append(getClass().getName() + " " + hashCode() + " [ ");
for(int counter = 0; counter < selCount; counter++) {
if(rows != null)
retBuffer.append(selection[counter].toString() + "@" +
Integer.toString(rows[counter])+ " ");
else
retBuffer.append(selection[counter].toString() + " ");
}
retBuffer.append("]");
return retBuffer.toString();
}
/**
* Returns a clone of this object with the same selection.
* This method does not duplicate
* selection listeners and property listeners.
*
* @exception CloneNotSupportedException never thrown by instances of
* this class
*/
public Object clone() throws CloneNotSupportedException {
DefaultTreeSelectionModel clone = (DefaultTreeSelectionModel)
super.clone();
clone.changeSupport = null;
if(selection != null) {
int selLength = selection.length;
clone.selection = new TreePath[selLength];
System.arraycopy(selection, 0, clone.selection, 0, selLength);
}
clone.listenerList = new EventListenerList();
clone.listSelectionModel = (DefaultListSelectionModel)
listSelectionModel.clone();
clone.uniquePaths = new Hashtable<TreePath, Boolean>();
clone.lastPaths = new Hashtable<TreePath, Boolean>();
clone.tempPaths = new TreePath[1];
return clone;
}
// Serialization support.
private void writeObject(ObjectOutputStream s) throws IOException {
Object[] tValues;
s.defaultWriteObject();
// Save the rowMapper, if it implements Serializable
if(rowMapper != null && rowMapper instanceof Serializable) {
tValues = new Object[2];
tValues[0] = "rowMapper";
tValues[1] = rowMapper;
}
else
tValues = new Object[0];
s.writeObject(tValues);
}
private void readObject(ObjectInputStream s)
throws IOException, ClassNotFoundException {
Object[] tValues;
s.defaultReadObject();
tValues = (Object[])s.readObject();
if(tValues.length > 0 && tValues[0].equals("rowMapper"))
rowMapper = (RowMapper)tValues[1];
}
}
/**
* Holds a path and whether or not it is new.
*/
class PathPlaceHolder {
protected boolean isNew;
protected TreePath path;
PathPlaceHolder(TreePath path, boolean isNew) {
this.path = path;
this.isNew = isNew;
}
}
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