* A specific node in a tree can be identified either by a
* TreePath (an object
* that encapsulates a node and all of its ancestors), or by its
* display row, where each row in the display area displays one node.
* An expanded node is a non-leaf node (as identified by
* TreeModel.isLeaf(node) returning false) that will displays
* its children when all its ancestors are expanded.
* A collapsed
* node is one which hides them. A hidden node is one which is
* under a collapsed ancestor. All of a viewable nodes parents
* are expanded, but may or may not be displayed. A displayed node
* is both viewable and in the display area, where it can be seen.
*
JTree methods use "visible" to mean "displayed":
* isRootVisible()
* setRootVisible()
* scrollPathToVisible()
* scrollRowToVisible()
* getVisibleRowCount()
* setVisibleRowCount()
* JTree methods use "visible" to mean
* "viewable" (under an expanded parent):
* isVisible()
* makeVisible()
* TreeSelectionListener interface and add the instance
* using the method addTreeSelectionListener.
* valueChanged will be invoked when the
* selection changes, that is if the user clicks twice on the same
* node valueChanged will only be invoked once.
* * If you are interested in detecting either double-click events or when * a user clicks on a node, regardless of whether or not it was selected, * we recommend you do the following: *
*
* final JTree tree = ...;
*
* MouseListener ml = new MouseAdapter() {
* public void mousePressed(MouseEvent e) {
* int selRow = tree.getRowForLocation(e.getX(), e.getY());
* TreePath selPath = tree.getPathForLocation(e.getX(), e.getY());
* if(selRow != -1) {
* if(e.getClickCount() == 1) {
* mySingleClick(selRow, selPath);
* }
* else if(e.getClickCount() == 2) {
* myDoubleClick(selRow, selPath);
* }
* }
* }
* };
* tree.addMouseListener(ml);
*
* NOTE: This example obtains both the path and row, but you only need to
* get the one you're interested in.
*
* To use JTree to display compound nodes
* (for example, nodes containing both
* a graphic icon and text), subclass {@link TreeCellRenderer} and use
* {@link #setCellRenderer} to tell the tree to use it. To edit such nodes,
* subclass {@link TreeCellEditor} and use {@link #setCellEditor}.
*
* Like all JComponent classes, you can use {@link InputMap} and
* {@link ActionMap}
* to associate an {@link Action} object with a {@link KeyStroke}
* and execute the action under specified conditions.
*
* 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 {@link java.beans.XMLEncoder}.
*
null, the UI uses a default
* cellRenderer.
*/
transient protected TreeCellRenderer cellRenderer;
/**
* Height to use for each display row. If this is <= 0 the renderer
* determines the height for each row.
*/
protected int rowHeight;
private boolean rowHeightSet = false;
/**
* Maps from TreePath to Boolean
* indicating whether or not the
* particular path is expanded. This ONLY indicates whether a
* given path is expanded, and NOT if it is visible or not. That
* information must be determined by visiting all the parent
* paths and seeing if they are visible.
*/
transient private Hashtable* A handle is a small icon that displays adjacent to the node which * allows the user to click once to expand or collapse the node. A * common interface shows a plus sign (+) for a node which can be * expanded and a minus sign (-) for a node which can be collapsed. * Handles are always shown for nodes below the topmost level. *
* If the rootVisible setting specifies that the root
* node is to be displayed, then that is the only node at the topmost
* level. If the root node is not displayed, then all of its
* children are at the topmost level of the tree. Handles are
* always displayed for nodes other than the topmost.
*
* If the root node isn't visible, it is generally a good to make
* this value true. Otherwise, the tree looks exactly like a list,
* and users may not know that the "list entries" are actually
* tree nodes.
*
* @see #rootVisible
*/
protected boolean showsRootHandles;
private boolean showsRootHandlesSet = false;
/**
* Creates a new event and passed it off the
* selectionListeners.
*/
protected transient TreeSelectionRedirector selectionRedirector;
/**
* Editor for the entries. Default is null
* (tree is not editable).
*/
transient protected TreeCellEditor cellEditor;
/**
* Is the tree editable? Default is false.
*/
protected boolean editable;
/**
* Is this tree a large model? This is a code-optimization setting.
* A large model can be used when the cell height is the same for all
* nodes. The UI will then cache very little information and instead
* continually message the model. Without a large model the UI caches
* most of the information, resulting in fewer method calls to the model.
*
* This value is only a suggestion to the UI. Not all UIs will
* take advantage of it. Default value is false.
*/
protected boolean largeModel;
/**
* Number of rows to make visible at one time. This value is used for
* the
* For drop modes
* For drop mode
* For
* Interpretation of this value depends on the drop mode set on the
* component. If the drop mode is
* If the drop mode is
* If the drop mode is This is an ugly workaround for a way to have the UI listener
* get notified before other listeners.
*/
private transient TreeExpansionListener uiTreeExpansionListener;
/**
* Max number of stacks to keep around.
*/
private static int TEMP_STACK_SIZE = 11;
//
// Bound property names
//
/** Bound property name for
* This is a bound property.
*
* @param ui the
* This is a bound property.
*
* @param x the
* This is a bound property.
*
* @param flag a boolean value, true if the tree is editable
* @beaninfo
* bound: true
* description: Whether the tree is editable.
*/
public void setEditable(boolean flag) {
boolean oldValue = this.editable;
this.editable = flag;
firePropertyChange(EDITABLE_PROPERTY, oldValue, flag);
if (accessibleContext != null) {
accessibleContext.firePropertyChange(
AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
(oldValue ? AccessibleState.EDITABLE : null),
(flag ? AccessibleState.EDITABLE : null));
}
}
/**
* Returns true if the tree is editable.
*
* @return true if the tree is editable
*/
public boolean isEditable() {
return editable;
}
/**
* Sets the cell editor. A
* This is a bound property.
*
* @param cellEditor the
* This is a bound property.
*
* @param newModel the
* This is a bound property.
*
* @param rootVisible true if the root node of the tree is to be displayed
* @see #rootVisible
* @beaninfo
* bound: true
* description: Whether or not the root node
* from the TreeModel is visible.
*/
public void setRootVisible(boolean rootVisible) {
boolean oldValue = this.rootVisible;
this.rootVisible = rootVisible;
firePropertyChange(ROOT_VISIBLE_PROPERTY, oldValue, this.rootVisible);
if (accessibleContext != null) {
((AccessibleJTree)accessibleContext).fireVisibleDataPropertyChange();
}
}
/**
* Sets the value of the
* This is a bound property.
*
* @param newValue
* This is a bound property.
*
* @param rowHeight the height of each cell, in pixels
* @beaninfo
* bound: true
* description: The height of each cell.
*/
public void setRowHeight(int rowHeight)
{
int oldValue = this.rowHeight;
this.rowHeight = rowHeight;
rowHeightSet = true;
firePropertyChange(ROW_HEIGHT_PROPERTY, oldValue, this.rowHeight);
invalidate();
}
/**
* Returns the height of each row. If the returned value is less than
* or equal to 0 the height for each row is determined by the
* renderer.
*
*/
public int getRowHeight()
{
return rowHeight;
}
/**
* Returns true if the height of each display row is a fixed size.
*
* @return true if the height of each row is a fixed size
*/
public boolean isFixedRowHeight()
{
return (rowHeight > 0);
}
/**
* Specifies whether the UI should use a large model.
* (Not all UIs will implement this.) Fires a property change
* for the LARGE_MODEL_PROPERTY.
*
* This is a bound property.
*
* @param newValue true to suggest a large model to the UI
* @see #largeModel
* @beaninfo
* bound: true
* description: Whether the UI should use a
* large model.
*/
public void setLargeModel(boolean newValue) {
boolean oldValue = largeModel;
largeModel = newValue;
firePropertyChange(LARGE_MODEL_PROPERTY, oldValue, newValue);
}
/**
* Returns true if the tree is configured for a large model.
*
* @return true if a large model is suggested
* @see #largeModel
*/
public boolean isLargeModel() {
return largeModel;
}
/**
* Determines what happens when editing is interrupted by selecting
* another node in the tree, a change in the tree's data, or by some
* other means. Setting this property to
* Fires a property change for the INVOKES_STOP_CELL_EDITING_PROPERTY.
*
* @param newValue true means that
* This is a bound property.
*
* @param newValue
* This is a bound property.
*
* @since 1.3
* @beaninfo
* bound: true
* description: Number of clicks before a node will expand/collapse.
*/
public void setToggleClickCount(int clickCount) {
int oldCount = toggleClickCount;
toggleClickCount = clickCount;
firePropertyChange(TOGGLE_CLICK_COUNT_PROPERTY, oldCount,
clickCount);
}
/**
* Returns the number of mouse clicks needed to expand or close a node.
*
* @return number of mouse clicks before node is expanded
* @since 1.3
*/
public int getToggleClickCount() {
return toggleClickCount;
}
/**
* Configures the
* This is a bound property.
*
* @param newValue the new value for
* The job of honoring this property, and recognizing a user drag gesture,
* lies with the look and feel implementation, and in particular, the tree's
* {@code TreeUI}. When automatic drag handling is enabled, most look and
* feels (including those that subclass {@code BasicLookAndFeel}) begin a
* drag and drop operation whenever the user presses the mouse button over
* an item and then moves the mouse a few pixels. Setting this property to
* {@code true} can therefore have a subtle effect on how selections behave.
*
* If a look and feel is used that ignores this property, you can still
* begin a drag and drop operation by calling {@code exportAsDrag} on the
* tree's {@code TransferHandler}.
*
* @param b whether or not to enable automatic drag handling
* @exception HeadlessException if
*
*
* The drop mode is only meaningful if this component has a
*
* Let's say that on the first call to this method the component decides
* to save some state (because it is about to use the selection to show
* a drop index). It can return a state object to the caller encapsulating
* any saved selection state. On a second call, let's say the drop location
* is being changed to something else. The component doesn't need to
* restore anything yet, so it simply passes back the same state object
* to have the DnD system continue storing it. Finally, let's say this
* method is messaged with
* This method is not meant for querying the drop location
* from a {@code TransferHandler}, as the drop location is only
* set after the {@code TransferHandler}'s
* When this property changes, a property change event with
* name "dropLocation" is fired by the component.
*
* @return the drop location
* @see #setDropMode
* @see TransferHandler#canImport(TransferHandler.TransferSupport)
* @since 1.6
*/
public final DropLocation getDropLocation() {
return dropLocation;
}
private void startDropTimer() {
if (dropTimer == null) {
dropTimer = new TreeTimer();
}
dropTimer.start();
}
private void cancelDropTimer() {
if (dropTimer != null && dropTimer.isRunning()) {
expandRow = -1;
dropTimer.stop();
}
}
/**
* Returns
* NOTE: For
* This is a bound property.
*
* @param newPath the new lead path
* @since 1.3
* @beaninfo
* bound: true
* description: Lead selection path
*/
public void setLeadSelectionPath(TreePath newPath) {
TreePath oldValue = leadPath;
leadPath = newPath;
firePropertyChange(LEAD_SELECTION_PATH_PROPERTY, oldValue, newPath);
if (accessibleContext != null){
((AccessibleJTree)accessibleContext).
fireActiveDescendantPropertyChange(oldValue, newPath);
}
}
/**
* Sets the path identified as the anchor.
* The anchor is not maintained by
* This is a bound property.
*
* @param newPath the new anchor path
* @since 1.3
* @beaninfo
* bound: true
* description: Anchor selection path
*/
public void setAnchorSelectionPath(TreePath newPath) {
TreePath oldValue = anchorPath;
anchorPath = newPath;
firePropertyChange(ANCHOR_SELECTION_PATH_PROPERTY, oldValue, newPath);
}
/**
* Selects the node at the specified row in the display.
*
* @param row the row to select, where 0 is the first row in
* the display
*/
public void setSelectionRow(int row) {
int[] rows = { row };
setSelectionRows(rows);
}
/**
* Selects the nodes corresponding to each of the specified rows
* in the display. If a particular element of
* Note that
* Note that
* Note:
* If
* If
* This is a bound property.
*
* @param selectionModel the
* The parameters are not order dependent. That is, {@code
* getPathBetweenRows(x, y)} is equivalent to
* {@code getPathBetweenRows(y, x)}.
*
* An empty array is returned if the row count is {@code 0}, or
* the specified indices do not bound the viewable set of rows.
*
* @param index0 the first index in the range
* @param index1 the last index in the range
* @return the paths (inclusive) between the specified row indices
*/
protected TreePath[] getPathBetweenRows(int index0, int index1) {
TreeUI tree = getUI();
if (tree != null) {
int rowCount = getRowCount();
if (rowCount > 0 && !((index0 < 0 && index1 < 0) ||
(index0 >= rowCount && index1 >= rowCount))){
index0 = Math.min(rowCount - 1, Math.max(index0, 0));
index1 = Math.min(rowCount - 1, Math.max(index1, 0));
int minIndex = Math.min(index0, index1);
int maxIndex = Math.max(index0, index1);
TreePath[] selection = new TreePath[
maxIndex - minIndex + 1];
for(int counter = minIndex; counter <= maxIndex; counter++) {
selection[counter - minIndex] =
tree.getPathForRow(this, counter);
}
return selection;
}
}
return new TreePath[0];
}
/**
* Selects the rows in the specified interval (inclusive). If
* the specified indices are within the viewable set of rows, or bound
* the viewable set of rows, then the specified rows are constrained by
* the viewable set of rows. If the specified indices are not within the
* viewable set of rows, or do not bound the viewable set of rows, then
* the selection is cleared. For example, if the row count is {@code
* 10}, and this method is invoked with {@code -1, 20}, then the
* specified indices bounds the viewable range, and this is treated as
* if invoked with {@code 0, 9}. On the other hand, if this were
* invoked with {@code -10, -1}, then the specified indices do not
* bound the viewable set of rows, and the selection is cleared.
*
* The parameters are not order dependent. That is, {@code
* setSelectionInterval(x, y)} is equivalent to
* {@code setSelectionInterval(y, x)}.
*
* @param index0 the first index in the range to select
* @param index1 the last index in the range to select
*/
public void setSelectionInterval(int index0, int index1) {
TreePath[] paths = getPathBetweenRows(index0, index1);
this.getSelectionModel().setSelectionPaths(paths);
}
/**
* Adds the specified rows (inclusive) to the selection. If the
* specified indices are within the viewable set of rows, or bound
* the viewable set of rows, then the specified indices are
* constrained by the viewable set of rows. If the indices are not
* within the viewable set of rows, or do not bound the viewable
* set of rows, then the selection is unchanged. For example, if
* the row count is {@code 10}, and this method is invoked with
* {@code -1, 20}, then the specified indices bounds the viewable
* range, and this is treated as if invoked with {@code 0, 9}. On
* the other hand, if this were invoked with {@code -10, -1}, then
* the specified indices do not bound the viewable set of rows,
* and the selection is unchanged.
*
* The parameters are not order dependent. That is, {@code
* addSelectionInterval(x, y)} is equivalent to
* {@code addSelectionInterval(y, x)}.
*
* @param index0 the first index in the range to add to the selection
* @param index1 the last index in the range to add to the selection
*/
public void addSelectionInterval(int index0, int index1) {
TreePath[] paths = getPathBetweenRows(index0, index1);
if (paths != null && paths.length > 0) {
this.getSelectionModel().addSelectionPaths(paths);
}
}
/**
* Removes the specified rows (inclusive) from the selection. If
* the specified indices are within the viewable set of rows, or bound
* the viewable set of rows, then the specified indices are constrained by
* the viewable set of rows. If the specified indices are not within the
* viewable set of rows, or do not bound the viewable set of rows, then
* the selection is unchanged. For example, if the row count is {@code
* 10}, and this method is invoked with {@code -1, 20}, then the
* specified range bounds the viewable range, and this is treated as
* if invoked with {@code 0, 9}. On the other hand, if this were
* invoked with {@code -10, -1}, then the specified range does not
* bound the viewable set of rows, and the selection is unchanged.
*
* The parameters are not order dependent. That is, {@code
* removeSelectionInterval(x, y)} is equivalent to
* {@code removeSelectionInterval(y, x)}.
*
* @param index0 the first row to remove from the selection
* @param index1 the last row to remove from the selection
*/
public void removeSelectionInterval(int index0, int index1) {
TreePath[] paths = getPathBetweenRows(index0, index1);
if (paths != null && paths.length > 0) {
this.getSelectionModel().removeSelectionPaths(paths);
}
}
/**
* Removes the node identified by the specified path from the current
* selection.
*
* @param path the
* This is a bound property.
*
* @param newCount the number of rows to display
* @beaninfo
* bound: true
* description: The number of rows that are to be displayed.
*/
public void setVisibleRowCount(int newCount) {
int oldCount = visibleRowCount;
visibleRowCount = newCount;
firePropertyChange(VISIBLE_ROW_COUNT_PROPERTY, oldCount,
visibleRowCount);
invalidate();
if (accessibleContext != null) {
((AccessibleJTree)accessibleContext).fireVisibleDataPropertyChange();
}
}
/**
* Returns the number of rows that are displayed in the display area.
*
* @return the number of rows displayed
*/
public int getVisibleRowCount() {
return visibleRowCount;
}
/**
* Expands the root path, assuming the current TreeModel has been set.
*/
private void expandRoot() {
TreeModel model = getModel();
if(model != null && model.getRoot() != null) {
expandPath(new TreePath(model.getRoot()));
}
}
/**
* Returns the TreePath to the next tree element that
* begins with a prefix. To handle the conversion of a
* Scrollable interface. It determines the preferred
* size of the display area.
*/
protected int visibleRowCount;
/**
* If true, when editing is to be stopped by way of selection changing,
* data in tree changing or other means stopCellEditing
* is invoked, and changes are saved. If false,
* cancelCellEditing is invoked, and changes
* are discarded. Default is false.
*/
protected boolean invokesStopCellEditing;
/**
* If true, when a node is expanded, as many of the descendants are
* scrolled to be visible.
*/
protected boolean scrollsOnExpand;
private boolean scrollsOnExpandSet = false;
/**
* Number of mouse clicks before a node is expanded.
*/
protected int toggleClickCount;
/**
* Updates the expandedState.
*/
transient protected TreeModelListener treeModelListener;
/**
* Used when setExpandedState is invoked,
* will be a Stack of Stacks.
*/
transient private Stacknull.
*/
private TreePath leadPath;
/**
* Anchor path.
*/
private TreePath anchorPath;
/**
* True if paths in the selection should be expanded.
*/
private boolean expandsSelectedPaths;
/**
* This is set to true for the life of the setUI call.
*/
private boolean settingUI;
/** If true, mouse presses on selections initiate a drag operation. */
private boolean dragEnabled;
/**
* The drop mode for this component.
*/
private DropMode dropMode = DropMode.USE_SELECTION;
/**
* The drop location.
*/
private transient DropLocation dropLocation;
/**
* A subclass of TransferHandler.DropLocation representing
* a drop location for a JTree.
*
* @see #getDropLocation
* @since 1.6
*/
public static final class DropLocation extends TransferHandler.DropLocation {
private final TreePath path;
private final int index;
private DropLocation(Point p, TreePath path, int index) {
super(p);
this.path = path;
this.index = index;
}
/**
* Returns the index where the dropped data should be inserted
* with respect to the path returned by getPath().
* DropMode.USE_SELECTION and
* DropMode.ON, this index is unimportant (and it will
* always be -1) as the only interesting data is the
* path over which the drop operation occurred.
* DropMode.INSERT, this index
* indicates the index at which the data should be inserted into
* the parent path represented by getPath().
* -1 indicates that the drop occurred over the
* parent itself, and in most cases should be treated as inserting
* into either the beginning or the end of the parent's list of
* children.
* DropMode.ON_OR_INSERT, this value will be
* an insert index, as described above, or -1 if
* the drop occurred over the path itself.
*
* @return the child index
* @see #getPath
*/
public int getChildIndex() {
return index;
}
/**
* Returns the path where dropped data should be placed in the
* tree.
* DropMode.USE_SELECTION
* or DropMode.ON, the return value is the path in the
* tree over which the data has been (or will be) dropped.
* null indicates that the drop is over empty space,
* not associated with a particular path.
* DropMode.INSERT, the return value
* refers to the path that should become the parent of the new data,
* in which case getChildIndex() indicates where the
* new item should be inserted into this parent path. A
* null path indicates that no parent path has been
* determined, which can happen for multiple reasons:
*
*
* It is up to the developer to decide if and how they wish to handle
* the null case.
* DropMode.ON_OR_INSERT,
* getChildIndex can be used to determine whether the
* drop is on top of the path itself (-1) or the index
* at which it should be inserted into the path (values other than
* -1).
*
* @return the drop path
* @see #getChildIndex
*/
public TreePath getPath() {
return path;
}
/**
* Returns a string representation of this drop location.
* This method is intended to be used for debugging purposes,
* and the content and format of the returned string may vary
* between implementations.
*
* @return a string representation of this drop location
*/
public String toString() {
return getClass().getName()
+ "[dropPoint=" + getDropPoint() + ","
+ "path=" + path + ","
+ "childIndex=" + index + "]";
}
}
/**
* The row to expand during DnD.
*/
private int expandRow = -1;
@SuppressWarnings("serial")
private class TreeTimer extends Timer {
public TreeTimer() {
super(2000, null);
setRepeats(false);
}
public void fireActionPerformed(ActionEvent ae) {
JTree.this.expandRow(expandRow);
}
}
/**
* A timer to expand nodes during drop.
*/
private TreeTimer dropTimer;
/**
* When addTreeExpansionListener is invoked,
* and settingUI is true, this ivar gets set to the passed in
* Listener. This listener is then notified first in
* fireTreeCollapsed and fireTreeExpanded.
* cellRenderer. */
public final static String CELL_RENDERER_PROPERTY = "cellRenderer";
/** Bound property name for treeModel. */
public final static String TREE_MODEL_PROPERTY = "model";
/** Bound property name for rootVisible. */
public final static String ROOT_VISIBLE_PROPERTY = "rootVisible";
/** Bound property name for showsRootHandles. */
public final static String SHOWS_ROOT_HANDLES_PROPERTY = "showsRootHandles";
/** Bound property name for rowHeight. */
public final static String ROW_HEIGHT_PROPERTY = "rowHeight";
/** Bound property name for cellEditor. */
public final static String CELL_EDITOR_PROPERTY = "cellEditor";
/** Bound property name for editable. */
public final static String EDITABLE_PROPERTY = "editable";
/** Bound property name for largeModel. */
public final static String LARGE_MODEL_PROPERTY = "largeModel";
/** Bound property name for selectionModel. */
public final static String SELECTION_MODEL_PROPERTY = "selectionModel";
/** Bound property name for visibleRowCount. */
public final static String VISIBLE_ROW_COUNT_PROPERTY = "visibleRowCount";
/** Bound property name for messagesStopCellEditing. */
public final static String INVOKES_STOP_CELL_EDITING_PROPERTY = "invokesStopCellEditing";
/** Bound property name for scrollsOnExpand. */
public final static String SCROLLS_ON_EXPAND_PROPERTY = "scrollsOnExpand";
/** Bound property name for toggleClickCount. */
public final static String TOGGLE_CLICK_COUNT_PROPERTY = "toggleClickCount";
/** Bound property name for leadSelectionPath.
* @since 1.3 */
public final static String LEAD_SELECTION_PATH_PROPERTY = "leadSelectionPath";
/** Bound property name for anchor selection path.
* @since 1.3 */
public final static String ANCHOR_SELECTION_PATH_PROPERTY = "anchorSelectionPath";
/** Bound property name for expands selected paths property
* @since 1.3 */
public final static String EXPANDS_SELECTED_PATHS_PROPERTY = "expandsSelectedPaths";
/**
* Creates and returns a sample TreeModel.
* Used primarily for beanbuilders to show something interesting.
*
* @return the default TreeModel
*/
protected static TreeModel getDefaultTreeModel() {
DefaultMutableTreeNode root = new DefaultMutableTreeNode("JTree");
DefaultMutableTreeNode parent;
parent = new DefaultMutableTreeNode("colors");
root.add(parent);
parent.add(new DefaultMutableTreeNode("blue"));
parent.add(new DefaultMutableTreeNode("violet"));
parent.add(new DefaultMutableTreeNode("red"));
parent.add(new DefaultMutableTreeNode("yellow"));
parent = new DefaultMutableTreeNode("sports");
root.add(parent);
parent.add(new DefaultMutableTreeNode("basketball"));
parent.add(new DefaultMutableTreeNode("soccer"));
parent.add(new DefaultMutableTreeNode("football"));
parent.add(new DefaultMutableTreeNode("hockey"));
parent = new DefaultMutableTreeNode("food");
root.add(parent);
parent.add(new DefaultMutableTreeNode("hot dogs"));
parent.add(new DefaultMutableTreeNode("pizza"));
parent.add(new DefaultMutableTreeNode("ravioli"));
parent.add(new DefaultMutableTreeNode("bananas"));
return new DefaultTreeModel(root);
}
/**
* Returns a TreeModel wrapping the specified object.
* If the object is:
*
then a new root node is created with each of the incoming
* objects as children. Otherwise, a new root is created with
* a value of {@code "root"}.
*
* @param value the Objects,
* Hashtable, or
* Vector
* Object used as the foundation for
* the TreeModel
* @return a TreeModel wrapping the specified object
*/
protected static TreeModel createTreeModel(Object value) {
DefaultMutableTreeNode root;
if((value instanceof Object[]) || (value instanceof Hashtable) ||
(value instanceof Vector)) {
root = new DefaultMutableTreeNode("root");
DynamicUtilTreeNode.createChildren(root, value);
}
else {
root = new DynamicUtilTreeNode("root", value);
}
return new DefaultTreeModel(root, false);
}
/**
* Returns a JTree with a sample model.
* The default model used by the tree defines a leaf node as any node
* without children.
*
* @see DefaultTreeModel#asksAllowsChildren
*/
public JTree() {
this(getDefaultTreeModel());
}
/**
* Returns a JTree with each element of the
* specified array as the
* child of a new root node which is not displayed.
* By default, the tree defines a leaf node as any node without
* children.
*
* @param value an array of Objects
* @see DefaultTreeModel#asksAllowsChildren
*/
public JTree(Object[] value) {
this(createTreeModel(value));
this.setRootVisible(false);
this.setShowsRootHandles(true);
expandRoot();
}
/**
* Returns a JTree with each element of the specified
* Vector as the
* child of a new root node which is not displayed. By default, the
* tree defines a leaf node as any node without children.
*
* @param value a Vector
* @see DefaultTreeModel#asksAllowsChildren
*/
public JTree(Vector value) {
this(createTreeModel(value));
this.setRootVisible(false);
this.setShowsRootHandles(true);
expandRoot();
}
/**
* Returns a JTree created from a Hashtable
* which does not display with root.
* Each value-half of the key/value pairs in the HashTable
* becomes a child of the new root node. By default, the tree defines
* a leaf node as any node without children.
*
* @param value a Hashtable
* @see DefaultTreeModel#asksAllowsChildren
*/
public JTree(Hashtable value) {
this(createTreeModel(value));
this.setRootVisible(false);
this.setShowsRootHandles(true);
expandRoot();
}
/**
* Returns a JTree with the specified
* TreeNode as its root,
* which displays the root node.
* By default, the tree defines a leaf node as any node without children.
*
* @param root a TreeNode object
* @see DefaultTreeModel#asksAllowsChildren
*/
public JTree(TreeNode root) {
this(root, false);
}
/**
* Returns a JTree with the specified TreeNode
* as its root, which
* displays the root node and which decides whether a node is a
* leaf node in the specified manner.
*
* @param root a TreeNode object
* @param asksAllowsChildren if false, any node without children is a
* leaf node; if true, only nodes that do not allow
* children are leaf nodes
* @see DefaultTreeModel#asksAllowsChildren
*/
public JTree(TreeNode root, boolean asksAllowsChildren) {
this(new DefaultTreeModel(root, asksAllowsChildren));
}
/**
* Returns an instance of JTree which displays the root node
* -- the tree is created using the specified data model.
*
* @param newModel the TreeModel to use as the data model
*/
@ConstructorProperties({"model"})
public JTree(TreeModel newModel) {
super();
expandedStack = new StackTreeUI object that renders this component
*/
public TreeUI getUI() {
return (TreeUI)ui;
}
/**
* Sets the L&F object that renders this component.
* TreeUI L&F object
* @see UIDefaults#getUI
* @beaninfo
* bound: true
* hidden: true
* attribute: visualUpdate true
* description: The UI object that implements the Component's LookAndFeel.
*/
public void setUI(TreeUI ui) {
if (this.ui != ui) {
settingUI = true;
uiTreeExpansionListener = null;
try {
super.setUI(ui);
}
finally {
settingUI = false;
}
}
}
/**
* Notification from the UIManager that the L&F has changed.
* Replaces the current UI object with the latest version from the
* UIManager.
*
* @see JComponent#updateUI
*/
public void updateUI() {
setUI((TreeUI)UIManager.getUI(this));
SwingUtilities.updateRendererOrEditorUI(getCellRenderer());
SwingUtilities.updateRendererOrEditorUI(getCellEditor());
}
/**
* Returns the name of the L&F class that renders this component.
*
* @return the string "TreeUI"
* @see JComponent#getUIClassID
* @see UIDefaults#getUI
*/
public String getUIClassID() {
return uiClassID;
}
/**
* Returns the current TreeCellRenderer
* that is rendering each cell.
*
* @return the TreeCellRenderer that is rendering each cell
*/
public TreeCellRenderer getCellRenderer() {
return cellRenderer;
}
/**
* Sets the TreeCellRenderer that will be used to
* draw each cell.
* TreeCellRenderer that is to render each cell
* @beaninfo
* bound: true
* description: The TreeCellRenderer that will be used to draw
* each cell.
*/
public void setCellRenderer(TreeCellRenderer x) {
TreeCellRenderer oldValue = cellRenderer;
cellRenderer = x;
firePropertyChange(CELL_RENDERER_PROPERTY, oldValue, cellRenderer);
invalidate();
}
/**
* Determines whether the tree is editable. Fires a property
* change event if the new setting is different from the existing
* setting.
* null value implies that the
* tree cannot be edited. If this represents a change in the
* cellEditor, the propertyChange
* method is invoked on all listeners.
* TreeCellEditor to use
* @beaninfo
* bound: true
* description: The cell editor. A null value implies the tree
* cannot be edited.
*/
public void setCellEditor(TreeCellEditor cellEditor) {
TreeCellEditor oldEditor = this.cellEditor;
this.cellEditor = cellEditor;
firePropertyChange(CELL_EDITOR_PROPERTY, oldEditor, cellEditor);
invalidate();
}
/**
* Returns the editor used to edit entries in the tree.
*
* @return the TreeCellEditor in use,
* or null if the tree cannot be edited
*/
public TreeCellEditor getCellEditor() {
return cellEditor;
}
/**
* Returns the TreeModel that is providing the data.
*
* @return the TreeModel that is providing the data
*/
public TreeModel getModel() {
return treeModel;
}
/**
* Sets the TreeModel that will provide the data.
* TreeModel that is to provide the data
* @beaninfo
* bound: true
* description: The TreeModel that will provide the data.
*/
public void setModel(TreeModel newModel) {
clearSelection();
TreeModel oldModel = treeModel;
if(treeModel != null && treeModelListener != null)
treeModel.removeTreeModelListener(treeModelListener);
if (accessibleContext != null) {
if (treeModel != null) {
treeModel.removeTreeModelListener((TreeModelListener)accessibleContext);
}
if (newModel != null) {
newModel.addTreeModelListener((TreeModelListener)accessibleContext);
}
}
treeModel = newModel;
clearToggledPaths();
if(treeModel != null) {
if(treeModelListener == null)
treeModelListener = createTreeModelListener();
if(treeModelListener != null)
treeModel.addTreeModelListener(treeModelListener);
// Mark the root as expanded, if it isn't a leaf.
Object treeRoot = treeModel.getRoot();
if(treeRoot != null &&
!treeModel.isLeaf(treeRoot)) {
expandedState.put(new TreePath(treeRoot),
Boolean.TRUE);
}
}
firePropertyChange(TREE_MODEL_PROPERTY, oldModel, treeModel);
invalidate();
}
/**
* Returns true if the root node of the tree is displayed.
*
* @return true if the root node of the tree is displayed
* @see #rootVisible
*/
public boolean isRootVisible() {
return rootVisible;
}
/**
* Determines whether or not the root node from
* the TreeModel is visible.
* showsRootHandles property,
* which specifies whether the node handles should be displayed.
* The default value of this property depends on the constructor
* used to create the JTree.
* Some look and feels might not support handles;
* they will ignore this property.
* true if root handles should be displayed;
* otherwise, false
* @see #showsRootHandles
* @see #getShowsRootHandles
* @beaninfo
* bound: true
* description: Whether the node handles are to be
* displayed.
*/
public void setShowsRootHandles(boolean newValue) {
boolean oldValue = showsRootHandles;
TreeModel model = getModel();
showsRootHandles = newValue;
showsRootHandlesSet = true;
firePropertyChange(SHOWS_ROOT_HANDLES_PROPERTY, oldValue,
showsRootHandles);
if (accessibleContext != null) {
((AccessibleJTree)accessibleContext).fireVisibleDataPropertyChange();
}
invalidate();
}
/**
* Returns the value of the showsRootHandles property.
*
* @return the value of the showsRootHandles property
* @see #showsRootHandles
*/
public boolean getShowsRootHandles()
{
return showsRootHandles;
}
/**
* Sets the height of each cell, in pixels. If the specified value
* is less than or equal to zero the current cell renderer is
* queried for each row's height.
* true causes the
* changes to be automatically saved when editing is interrupted.
* stopCellEditing is invoked
* when editing is interrupted, and data is saved; false means that
* cancelCellEditing is invoked, and changes are lost
* @beaninfo
* bound: true
* description: Determines what happens when editing is interrupted,
* selecting another node in the tree, a change in the
* tree's data, or some other means.
*/
public void setInvokesStopCellEditing(boolean newValue) {
boolean oldValue = invokesStopCellEditing;
invokesStopCellEditing = newValue;
firePropertyChange(INVOKES_STOP_CELL_EDITING_PROPERTY, oldValue,
newValue);
}
/**
* Returns the indicator that tells what happens when editing is
* interrupted.
*
* @return the indicator that tells what happens when editing is
* interrupted
* @see #setInvokesStopCellEditing
*/
public boolean getInvokesStopCellEditing() {
return invokesStopCellEditing;
}
/**
* Sets the scrollsOnExpand property,
* which determines whether the
* tree might scroll to show previously hidden children.
* If this property is true (the default),
* when a node expands
* the tree can use scrolling to make
* the maximum possible number of the node's descendants visible.
* In some look and feels, trees might not need to scroll when expanded;
* those look and feels will ignore this property.
* false to disable scrolling on expansion;
* true to enable it
* @see #getScrollsOnExpand
*
* @beaninfo
* bound: true
* description: Indicates if a node descendant should be scrolled when expanded.
*/
public void setScrollsOnExpand(boolean newValue) {
boolean oldValue = scrollsOnExpand;
scrollsOnExpand = newValue;
scrollsOnExpandSet = true;
firePropertyChange(SCROLLS_ON_EXPAND_PROPERTY, oldValue,
newValue);
}
/**
* Returns the value of the scrollsOnExpand property.
*
* @return the value of the scrollsOnExpand property
*/
public boolean getScrollsOnExpand() {
return scrollsOnExpand;
}
/**
* Sets the number of mouse clicks before a node will expand or close.
* The default is two.
* expandsSelectedPaths property. If
* true, any time the selection is changed, either via the
* TreeSelectionModel, or the cover methods provided by
* JTree, the TreePaths parents will be
* expanded to make them visible (visible meaning the parent path is
* expanded, not necessarily in the visible rectangle of the
* JTree). If false, when the selection
* changes the nodes parent is not made visible (all its parents expanded).
* This is useful if you wish to have your selection model maintain paths
* that are not always visible (all parents expanded).
* expandsSelectedPaths
*
* @since 1.3
* @beaninfo
* bound: true
* description: Indicates whether changes to the selection should make
* the parent of the path visible.
*/
public void setExpandsSelectedPaths(boolean newValue) {
boolean oldValue = expandsSelectedPaths;
expandsSelectedPaths = newValue;
firePropertyChange(EXPANDS_SELECTED_PATHS_PROPERTY, oldValue,
newValue);
}
/**
* Returns the expandsSelectedPaths property.
* @return true if selection changes result in the parent path being
* expanded
* @since 1.3
* @see #setExpandsSelectedPaths
*/
public boolean getExpandsSelectedPaths() {
return expandsSelectedPaths;
}
/**
* Turns on or off automatic drag handling. In order to enable automatic
* drag handling, this property should be set to {@code true}, and the
* tree's {@code TransferHandler} needs to be {@code non-null}.
* The default value of the {@code dragEnabled} property is {@code false}.
* b is true and
* GraphicsEnvironment.isHeadless()
* returns true
* @see java.awt.GraphicsEnvironment#isHeadless
* @see #getDragEnabled
* @see #setTransferHandler
* @see TransferHandler
* @since 1.4
*
* @beaninfo
* description: determines whether automatic drag handling is enabled
* bound: false
*/
public void setDragEnabled(boolean b) {
if (b && GraphicsEnvironment.isHeadless()) {
throw new HeadlessException();
}
dragEnabled = b;
}
/**
* Returns whether or not automatic drag handling is enabled.
*
* @return the value of the {@code dragEnabled} property
* @see #setDragEnabled
* @since 1.4
*/
public boolean getDragEnabled() {
return dragEnabled;
}
/**
* Sets the drop mode for this component. For backward compatibility,
* the default for this property is DropMode.USE_SELECTION.
* Usage of one of the other modes is recommended, however, for an
* improved user experience. DropMode.ON, for instance,
* offers similar behavior of showing items as selected, but does so without
* affecting the actual selection in the tree.
* JTree supports the following drop modes:
*
*
* DropMode.USE_SELECTIONDropMode.ONDropMode.INSERTDropMode.ON_OR_INSERTTransferHandler that accepts drops.
*
* @param dropMode the drop mode to use
* @throws IllegalArgumentException if the drop mode is unsupported
* or null
* @see #getDropMode
* @see #getDropLocation
* @see #setTransferHandler
* @see TransferHandler
* @since 1.6
*/
public final void setDropMode(DropMode dropMode) {
if (dropMode != null) {
switch (dropMode) {
case USE_SELECTION:
case ON:
case INSERT:
case ON_OR_INSERT:
this.dropMode = dropMode;
return;
}
}
throw new IllegalArgumentException(dropMode + ": Unsupported drop mode for tree");
}
/**
* Returns the drop mode for this component.
*
* @return the drop mode for this component
* @see #setDropMode
* @since 1.6
*/
public final DropMode getDropMode() {
return dropMode;
}
/**
* Calculates a drop location in this component, representing where a
* drop at the given point should insert data.
*
* @param p the point to calculate a drop location for
* @return the drop location, or null
*/
DropLocation dropLocationForPoint(Point p) {
DropLocation location = null;
int row = getClosestRowForLocation(p.x, p.y);
Rectangle bounds = getRowBounds(row);
TreeModel model = getModel();
Object root = (model == null) ? null : model.getRoot();
TreePath rootPath = (root == null) ? null : new TreePath(root);
TreePath child;
TreePath parent;
boolean outside = row == -1
|| p.y < bounds.y
|| p.y >= bounds.y + bounds.height;
switch(dropMode) {
case USE_SELECTION:
case ON:
if (outside) {
location = new DropLocation(p, null, -1);
} else {
location = new DropLocation(p, getPathForRow(row), -1);
}
break;
case INSERT:
case ON_OR_INSERT:
if (row == -1) {
if (root != null && !model.isLeaf(root) && isExpanded(rootPath)) {
location = new DropLocation(p, rootPath, 0);
} else {
location = new DropLocation(p, null, -1);
}
break;
}
boolean checkOn = dropMode == DropMode.ON_OR_INSERT
|| !model.isLeaf(getPathForRow(row).getLastPathComponent());
Section section = SwingUtilities2.liesInVertical(bounds, p, checkOn);
if(section == LEADING) {
child = getPathForRow(row);
parent = child.getParentPath();
} else if (section == TRAILING) {
int index = row + 1;
if (index >= getRowCount()) {
if (model.isLeaf(root) || !isExpanded(rootPath)) {
location = new DropLocation(p, null, -1);
} else {
parent = rootPath;
index = model.getChildCount(root);
location = new DropLocation(p, parent, index);
}
break;
}
child = getPathForRow(index);
parent = child.getParentPath();
} else {
assert checkOn;
location = new DropLocation(p, getPathForRow(row), -1);
break;
}
if (parent != null) {
location = new DropLocation(p, parent,
model.getIndexOfChild(parent.getLastPathComponent(),
child.getLastPathComponent()));
} else if (checkOn || !model.isLeaf(root)) {
location = new DropLocation(p, rootPath, -1);
} else {
location = new DropLocation(p, null, -1);
}
break;
default:
assert false : "Unexpected drop mode";
}
if (outside || row != expandRow) {
cancelDropTimer();
}
if (!outside && row != expandRow) {
if (isCollapsed(row)) {
expandRow = row;
startDropTimer();
}
}
return location;
}
/**
* Called to set or clear the drop location during a DnD operation.
* In some cases, the component may need to use it's internal selection
* temporarily to indicate the drop location. To help facilitate this,
* this method returns and accepts as a parameter a state object.
* This state object can be used to store, and later restore, the selection
* state. Whatever this method returns will be passed back to it in
* future calls, as the state parameter. If it wants the DnD system to
* continue storing the same state, it must pass it back every time.
* Here's how this is used:
* null. This means DnD
* is finished with this component for now, meaning it should restore
* state. At this point, it can use the state parameter to restore
* said state, and of course return null since there's
* no longer anything to store.
*
* @param location the drop location (as calculated by
* dropLocationForPoint) or null
* if there's no longer a valid drop location
* @param state the state object saved earlier for this component,
* or null
* @param forDrop whether or not the method is being called because an
* actual drop occurred
* @return any saved state for this component, or null if none
*/
Object setDropLocation(TransferHandler.DropLocation location,
Object state,
boolean forDrop) {
Object retVal = null;
DropLocation treeLocation = (DropLocation)location;
if (dropMode == DropMode.USE_SELECTION) {
if (treeLocation == null) {
if (!forDrop && state != null) {
setSelectionPaths(((TreePath[][])state)[0]);
setAnchorSelectionPath(((TreePath[][])state)[1][0]);
setLeadSelectionPath(((TreePath[][])state)[1][1]);
}
} else {
if (dropLocation == null) {
TreePath[] paths = getSelectionPaths();
if (paths == null) {
paths = new TreePath[0];
}
retVal = new TreePath[][] {paths,
{getAnchorSelectionPath(), getLeadSelectionPath()}};
} else {
retVal = state;
}
setSelectionPath(treeLocation.getPath());
}
}
DropLocation old = dropLocation;
dropLocation = treeLocation;
firePropertyChange("dropLocation", old, dropLocation);
return retVal;
}
/**
* Called to indicate to this component that DnD is done.
* Allows for us to cancel the expand timer.
*/
void dndDone() {
cancelDropTimer();
dropTimer = null;
}
/**
* Returns the location that this component should visually indicate
* as the drop location during a DnD operation over the component,
* or {@code null} if no location is to currently be shown.
* canImport
* has returned and has allowed for the location to be shown.
* isEditable. This is invoked from the UI before
* editing begins to insure that the given path can be edited. This
* is provided as an entry point for subclassers to add filtered
* editing without having to resort to creating a new editor.
*
* @return true if every parent node and the node itself is editable
* @see #isEditable
*/
public boolean isPathEditable(TreePath path) {
return isEditable();
}
/**
* Overrides JComponent's getToolTipText
* method in order to allow
* renderer's tips to be used if it has text set.
* JTree to properly display tooltips of its
* renderers, JTree must be a registered component with the
* ToolTipManager. This can be done by invoking
* ToolTipManager.sharedInstance().registerComponent(tree).
* This is not done automatically!
*
* @param event the MouseEvent that initiated the
* ToolTip display
* @return a string containing the tooltip or null
* if event is null
*/
public String getToolTipText(MouseEvent event) {
String tip = null;
if(event != null) {
Point p = event.getPoint();
int selRow = getRowForLocation(p.x, p.y);
TreeCellRenderer r = getCellRenderer();
if(selRow != -1 && r != null) {
TreePath path = getPathForRow(selRow);
Object lastPath = path.getLastPathComponent();
Component rComponent = r.getTreeCellRendererComponent
(this, lastPath, isRowSelected(selRow),
isExpanded(selRow), getModel().isLeaf(lastPath), selRow,
true);
if(rComponent instanceof JComponent) {
MouseEvent newEvent;
Rectangle pathBounds = getPathBounds(path);
p.translate(-pathBounds.x, -pathBounds.y);
newEvent = new MouseEvent(rComponent, event.getID(),
event.getWhen(),
event.getModifiers(),
p.x, p.y,
event.getXOnScreen(),
event.getYOnScreen(),
event.getClickCount(),
event.isPopupTrigger(),
MouseEvent.NOBUTTON);
tip = ((JComponent)rComponent).getToolTipText(newEvent);
}
}
}
// No tip from the renderer get our own tip
if (tip == null) {
tip = getToolTipText();
}
return tip;
}
/**
* Called by the renderers to convert the specified value to
* text. This implementation returns value.toString, ignoring
* all other arguments. To control the conversion, subclass this
* method and use any of the arguments you need.
*
* @param value the Object to convert to text
* @param selected true if the node is selected
* @param expanded true if the node is expanded
* @param leaf true if the node is a leaf node
* @param row an integer specifying the node's display row, where 0 is
* the first row in the display
* @param hasFocus true if the node has the focus
* @return the String representation of the node's value
*/
public String convertValueToText(Object value, boolean selected,
boolean expanded, boolean leaf, int row,
boolean hasFocus) {
if(value != null) {
String sValue = value.toString();
if (sValue != null) {
return sValue;
}
}
return "";
}
//
// The following are convenience methods that get forwarded to the
// current TreeUI.
//
/**
* Returns the number of viewable nodes. A node is viewable if all of its
* parents are expanded. The root is only included in this count if
* {@code isRootVisible()} is {@code true}. This returns {@code 0} if
* the UI has not been set.
*
* @return the number of viewable nodes
*/
public int getRowCount() {
TreeUI tree = getUI();
if(tree != null)
return tree.getRowCount(this);
return 0;
}
/**
* Selects the node identified by the specified path. If any
* component of the path is hidden (under a collapsed node), and
* getExpandsSelectedPaths is true it is
* exposed (made viewable).
*
* @param path the TreePath specifying the node to select
*/
public void setSelectionPath(TreePath path) {
getSelectionModel().setSelectionPath(path);
}
/**
* Selects the nodes identified by the specified array of paths.
* If any component in any of the paths is hidden (under a collapsed
* node), and getExpandsSelectedPaths is true
* it is exposed (made viewable).
*
* @param paths an array of TreePath objects that specifies
* the nodes to select
*/
public void setSelectionPaths(TreePath[] paths) {
getSelectionModel().setSelectionPaths(paths);
}
/**
* Sets the path identifies as the lead. The lead may not be selected.
* The lead is not maintained by JTree,
* rather the UI will update it.
* JTree, rather the UI will
* update it.
* rows is
* < 0 or >= getRowCount, it will be ignored.
* If none of the elements
* in rows are valid rows, the selection will
* be cleared. That is it will be as if clearSelection
* was invoked.
*
* @param rows an array of ints specifying the rows to select,
* where 0 indicates the first row in the display
*/
public void setSelectionRows(int[] rows) {
TreeUI ui = getUI();
if(ui != null && rows != null) {
int numRows = rows.length;
TreePath[] paths = new TreePath[numRows];
for(int counter = 0; counter < numRows; counter++) {
paths[counter] = ui.getPathForRow(this, rows[counter]);
}
setSelectionPaths(paths);
}
}
/**
* Adds the node identified by the specified TreePath
* to the current selection. If any component of the path isn't
* viewable, and getExpandsSelectedPaths is true it is
* made viewable.
* JTree does not allow duplicate nodes to
* exist as children under the same parent -- each sibling must be
* a unique object.
*
* @param path the TreePath to add
*/
public void addSelectionPath(TreePath path) {
getSelectionModel().addSelectionPath(path);
}
/**
* Adds each path in the array of paths to the current selection. If
* any component of any of the paths isn't viewable and
* getExpandsSelectedPaths is true, it is
* made viewable.
* JTree does not allow duplicate nodes to
* exist as children under the same parent -- each sibling must be
* a unique object.
*
* @param paths an array of TreePath objects that specifies
* the nodes to add
*/
public void addSelectionPaths(TreePath[] paths) {
getSelectionModel().addSelectionPaths(paths);
}
/**
* Adds the path at the specified row to the current selection.
*
* @param row an integer specifying the row of the node to add,
* where 0 is the first row in the display
*/
public void addSelectionRow(int row) {
int[] rows = { row };
addSelectionRows(rows);
}
/**
* Adds the paths at each of the specified rows to the current selection.
*
* @param rows an array of ints specifying the rows to add,
* where 0 indicates the first row in the display
*/
public void addSelectionRows(int[] rows) {
TreeUI ui = getUI();
if(ui != null && rows != null) {
int numRows = rows.length;
TreePath[] paths = new TreePath[numRows];
for(int counter = 0; counter < numRows; counter++)
paths[counter] = ui.getPathForRow(this, rows[counter]);
addSelectionPaths(paths);
}
}
/**
* Returns the last path component of the selected path. This is
* a convenience method for
* {@code getSelectionModel().getSelectionPath().getLastPathComponent()}.
* This is typically only useful if the selection has one path.
*
* @return the last path component of the selected path, or
* null if nothing is selected
* @see TreePath#getLastPathComponent
*/
public Object getLastSelectedPathComponent() {
TreePath selPath = getSelectionModel().getSelectionPath();
if(selPath != null)
return selPath.getLastPathComponent();
return null;
}
/**
* Returns the path identified as the lead.
* @return path identified as the lead
*/
public TreePath getLeadSelectionPath() {
return leadPath;
}
/**
* Returns the path identified as the anchor.
* @return path identified as the anchor
* @since 1.3
*/
public TreePath getAnchorSelectionPath() {
return anchorPath;
}
/**
* Returns the path to the first selected node.
*
* @return the TreePath for the first selected node,
* or null if nothing is currently selected
*/
public TreePath getSelectionPath() {
return getSelectionModel().getSelectionPath();
}
/**
* Returns the paths of all selected values.
*
* @return an array of TreePath objects indicating the selected
* nodes, or null if nothing is currently selected
*/
public TreePath[] getSelectionPaths() {
TreePath[] selectionPaths = getSelectionModel().getSelectionPaths();
return (selectionPaths != null && selectionPaths.length > 0) ? selectionPaths : null;
}
/**
* Returns all of the currently selected rows. This method is simply
* forwarded to the TreeSelectionModel.
* If nothing is selected null or an empty array will
* be returned, based on the TreeSelectionModel
* implementation.
*
* @return an array of integers that identifies all currently selected rows
* where 0 is the first row in the display
*/
public int[] getSelectionRows() {
return getSelectionModel().getSelectionRows();
}
/**
* Returns the number of nodes selected.
*
* @return the number of nodes selected
*/
public int getSelectionCount() {
return selectionModel.getSelectionCount();
}
/**
* Returns the smallest selected row. If the selection is empty, or
* none of the selected paths are viewable, {@code -1} is returned.
*
* @return the smallest selected row
*/
public int getMinSelectionRow() {
return getSelectionModel().getMinSelectionRow();
}
/**
* Returns the largest selected row. If the selection is empty, or
* none of the selected paths are viewable, {@code -1} is returned.
*
* @return the largest selected row
*/
public int getMaxSelectionRow() {
return getSelectionModel().getMaxSelectionRow();
}
/**
* Returns the row index corresponding to the lead path.
*
* @return an integer giving the row index of the lead path,
* where 0 is the first row in the display; or -1
* if leadPath is null
*/
public int getLeadSelectionRow() {
TreePath leadPath = getLeadSelectionPath();
if (leadPath != null) {
return getRowForPath(leadPath);
}
return -1;
}
/**
* Returns true if the item identified by the path is currently selected.
*
* @param path a TreePath identifying a node
* @return true if the node is selected
*/
public boolean isPathSelected(TreePath path) {
return getSelectionModel().isPathSelected(path);
}
/**
* Returns true if the node identified by row is selected.
*
* @param row an integer specifying a display row, where 0 is the first
* row in the display
* @return true if the node is selected
*/
public boolean isRowSelected(int row) {
return getSelectionModel().isRowSelected(row);
}
/**
* Returns an Enumeration of the descendants of the
* path parent that
* are currently expanded. If parent is not currently
* expanded, this will return null.
* If you expand/collapse nodes while
* iterating over the returned Enumeration
* this may not return all
* the expanded paths, or may return paths that are no longer expanded.
*
* @param parent the path which is to be examined
* @return an Enumeration of the descendents of
* parent, or null if
* parent is not currently expanded
*/
public Enumerationpath has ever been expanded
*/
public boolean hasBeenExpanded(TreePath path) {
return (path != null && expandedState.get(path) != null);
}
/**
* Returns true if the node identified by the path is currently expanded,
*
* @param path the TreePath specifying the node to check
* @return false if any of the nodes in the node's path are collapsed,
* true if all nodes in the path are expanded
*/
public boolean isExpanded(TreePath path) {
if(path == null)
return false;
Object value;
do{
value = expandedState.get(path);
if(value == null || !((Boolean)value).booleanValue())
return false;
} while( (path=path.getParentPath())!=null );
return true;
}
/**
* Returns true if the node at the specified display row is currently
* expanded.
*
* @param row the row to check, where 0 is the first row in the
* display
* @return true if the node is currently expanded, otherwise false
*/
public boolean isExpanded(int row) {
TreeUI tree = getUI();
if(tree != null) {
TreePath path = tree.getPathForRow(this, row);
if(path != null) {
Boolean value = expandedState.get(path);
return (value != null && value.booleanValue());
}
}
return false;
}
/**
* Returns true if the value identified by path is currently collapsed,
* this will return false if any of the values in path are currently
* not being displayed.
*
* @param path the TreePath to check
* @return true if any of the nodes in the node's path are collapsed,
* false if all nodes in the path are expanded
*/
public boolean isCollapsed(TreePath path) {
return !isExpanded(path);
}
/**
* Returns true if the node at the specified display row is collapsed.
*
* @param row the row to check, where 0 is the first row in the
* display
* @return true if the node is currently collapsed, otherwise false
*/
public boolean isCollapsed(int row) {
return !isExpanded(row);
}
/**
* Ensures that the node identified by path is currently viewable.
*
* @param path the TreePath to make visible
*/
public void makeVisible(TreePath path) {
if(path != null) {
TreePath parentPath = path.getParentPath();
if(parentPath != null) {
expandPath(parentPath);
}
}
}
/**
* Returns true if the value identified by path is currently viewable,
* which means it is either the root or all of its parents are expanded.
* Otherwise, this method returns false.
*
* @return true if the node is viewable, otherwise false
*/
public boolean isVisible(TreePath path) {
if(path != null) {
TreePath parentPath = path.getParentPath();
if(parentPath != null)
return isExpanded(parentPath);
// Root.
return true;
}
return false;
}
/**
* Returns the Rectangle that the specified node will be drawn
* into. Returns null if any component in the path is hidden
* (under a collapsed parent).
*
* This method returns a valid rectangle, even if the specified
* node is not currently displayed.
*
* @param path the TreePath identifying the node
* @return the Rectangle the node is drawn in,
* or null
*/
public Rectangle getPathBounds(TreePath path) {
TreeUI tree = getUI();
if(tree != null)
return tree.getPathBounds(this, path);
return null;
}
/**
* Returns the Rectangle that the node at the specified row is
* drawn in.
*
* @param row the row to be drawn, where 0 is the first row in the
* display
* @return the Rectangle the node is drawn in
*/
public Rectangle getRowBounds(int row) {
return getPathBounds(getPathForRow(row));
}
/**
* Makes sure all the path components in path are expanded (except
* for the last path component) and scrolls so that the
* node identified by the path is displayed. Only works when this
* JTree is contained in a JScrollPane.
*
* @param path the TreePath identifying the node to
* bring into view
*/
public void scrollPathToVisible(TreePath path) {
if(path != null) {
makeVisible(path);
Rectangle bounds = getPathBounds(path);
if(bounds != null) {
scrollRectToVisible(bounds);
if (accessibleContext != null) {
((AccessibleJTree)accessibleContext).fireVisibleDataPropertyChange();
}
}
}
}
/**
* Scrolls the item identified by row until it is displayed. The minimum
* of amount of scrolling necessary to bring the row into view
* is performed. Only works when this JTree is contained in a
* JScrollPane.
*
* @param row an integer specifying the row to scroll, where 0 is the
* first row in the display
*/
public void scrollRowToVisible(int row) {
scrollPathToVisible(getPathForRow(row));
}
/**
* Returns the path for the specified row. If row is
* not visible, or a {@code TreeUI} has not been set, null
* is returned.
*
* @param row an integer specifying a row
* @return the TreePath to the specified node,
* null if row < 0
* or row >= getRowCount()
*/
public TreePath getPathForRow(int row) {
TreeUI tree = getUI();
if(tree != null)
return tree.getPathForRow(this, row);
return null;
}
/**
* Returns the row that displays the node identified by the specified
* path.
*
* @param path the TreePath identifying a node
* @return an integer specifying the display row, where 0 is the first
* row in the display, or -1 if any of the elements in path
* are hidden under a collapsed parent.
*/
public int getRowForPath(TreePath path) {
TreeUI tree = getUI();
if(tree != null)
return tree.getRowForPath(this, path);
return -1;
}
/**
* Ensures that the node identified by the specified path is
* expanded and viewable. If the last item in the path is a
* leaf, this will have no effect.
*
* @param path the TreePath identifying a node
*/
public void expandPath(TreePath path) {
// Only expand if not leaf!
TreeModel model = getModel();
if(path != null && model != null &&
!model.isLeaf(path.getLastPathComponent())) {
setExpandedState(path, true);
}
}
/**
* Ensures that the node in the specified row is expanded and
* viewable.
* row is < 0 or >= getRowCount this
* will have no effect.
*
* @param row an integer specifying a display row, where 0 is the
* first row in the display
*/
public void expandRow(int row) {
expandPath(getPathForRow(row));
}
/**
* Ensures that the node identified by the specified path is
* collapsed and viewable.
*
* @param path the TreePath identifying a node
*/
public void collapsePath(TreePath path) {
setExpandedState(path, false);
}
/**
* Ensures that the node in the specified row is collapsed.
* row is < 0 or >= getRowCount this
* will have no effect.
*
* @param row an integer specifying a display row, where 0 is the
* first row in the display
*/
public void collapseRow(int row) {
collapsePath(getPathForRow(row));
}
/**
* Returns the path for the node at the specified location.
*
* @param x an integer giving the number of pixels horizontally from
* the left edge of the display area, minus any left margin
* @param y an integer giving the number of pixels vertically from
* the top of the display area, minus any top margin
* @return the TreePath for the node at that location
*/
public TreePath getPathForLocation(int x, int y) {
TreePath closestPath = getClosestPathForLocation(x, y);
if(closestPath != null) {
Rectangle pathBounds = getPathBounds(closestPath);
if(pathBounds != null &&
x >= pathBounds.x && x < (pathBounds.x + pathBounds.width) &&
y >= pathBounds.y && y < (pathBounds.y + pathBounds.height))
return closestPath;
}
return null;
}
/**
* Returns the row for the specified location.
*
* @param x an integer giving the number of pixels horizontally from
* the left edge of the display area, minus any left margin
* @param y an integer giving the number of pixels vertically from
* the top of the display area, minus any top margin
* @return the row corresponding to the location, or -1 if the
* location is not within the bounds of a displayed cell
* @see #getClosestRowForLocation
*/
public int getRowForLocation(int x, int y) {
return getRowForPath(getPathForLocation(x, y));
}
/**
* Returns the path to the node that is closest to x,y. If
* no nodes are currently viewable, or there is no model, returns
* null, otherwise it always returns a valid path. To test if
* the node is exactly at x, y, get the node's bounds and
* test x, y against that.
*
* @param x an integer giving the number of pixels horizontally from
* the left edge of the display area, minus any left margin
* @param y an integer giving the number of pixels vertically from
* the top of the display area, minus any top margin
* @return the TreePath for the node closest to that location,
* null if nothing is viewable or there is no model
*
* @see #getPathForLocation
* @see #getPathBounds
*/
public TreePath getClosestPathForLocation(int x, int y) {
TreeUI tree = getUI();
if(tree != null)
return tree.getClosestPathForLocation(this, x, y);
return null;
}
/**
* Returns the row to the node that is closest to x,y. If no nodes
* are viewable or there is no model, returns -1. Otherwise,
* it always returns a valid row. To test if the returned object is
* exactly at x, y, get the bounds for the node at the returned
* row and test x, y against that.
*
* @param x an integer giving the number of pixels horizontally from
* the left edge of the display area, minus any left margin
* @param y an integer giving the number of pixels vertically from
* the top of the display area, minus any top margin
* @return the row closest to the location, -1 if nothing is
* viewable or there is no model
*
* @see #getRowForLocation
* @see #getRowBounds
*/
public int getClosestRowForLocation(int x, int y) {
return getRowForPath(getClosestPathForLocation(x, y));
}
/**
* Returns true if the tree is being edited. The item that is being
* edited can be obtained using getSelectionPath.
*
* @return true if the user is currently editing a node
* @see #getSelectionPath
*/
public boolean isEditing() {
TreeUI tree = getUI();
if(tree != null)
return tree.isEditing(this);
return false;
}
/**
* Ends the current editing session.
* (The DefaultTreeCellEditor
* object saves any edits that are currently in progress on a cell.
* Other implementations may operate differently.)
* Has no effect if the tree isn't being edited.
*
* Note:
*
* @return true if editing was in progress and is now stopped,
* false if editing was not in progress
*/
public boolean stopEditing() {
TreeUI tree = getUI();
if(tree != null)
return tree.stopEditing(this);
return false;
}
/**
* Cancels the current editing session. Has no effect if the
* tree isn't being edited.
*/
public void cancelEditing() {
TreeUI tree = getUI();
if(tree != null)
tree.cancelEditing(this);
}
/**
* Selects the node identified by the specified path and initiates
* editing. The edit-attempt fails if the
* To make edit-saves automatic whenever the user changes
* their position in the tree, use {@link #setInvokesStopCellEditing}.
* CellEditor
* does not allow
* editing for the specified item.
*
* @param path the TreePath identifying a node
*/
public void startEditingAtPath(TreePath path) {
TreeUI tree = getUI();
if(tree != null)
tree.startEditingAtPath(this, path);
}
/**
* Returns the path to the element that is currently being edited.
*
* @return the TreePath for the node being edited
*/
public TreePath getEditingPath() {
TreeUI tree = getUI();
if(tree != null)
return tree.getEditingPath(this);
return null;
}
//
// Following are primarily convenience methods for mapping from
// row based selections to path selections. Sometimes it is
// easier to deal with these than paths (mouse downs, key downs
// usually just deal with index based selections).
// Since row based selections require a UI many of these won't work
// without one.
//
/**
* Sets the tree's selection model. When a null value is
* specified an empty
* selectionModel is used, which does not allow selections.
* TreeSelectionModel to use,
* or null to disable selections
* @see TreeSelectionModel
* @beaninfo
* bound: true
* description: The tree's selection model.
*/
public void setSelectionModel(TreeSelectionModel selectionModel) {
if(selectionModel == null)
selectionModel = EmptySelectionModel.sharedInstance();
TreeSelectionModel oldValue = this.selectionModel;
if (this.selectionModel != null && selectionRedirector != null) {
this.selectionModel.removeTreeSelectionListener
(selectionRedirector);
}
if (accessibleContext != null) {
this.selectionModel.removeTreeSelectionListener((TreeSelectionListener)accessibleContext);
selectionModel.addTreeSelectionListener((TreeSelectionListener)accessibleContext);
}
this.selectionModel = selectionModel;
if (selectionRedirector != null) {
this.selectionModel.addTreeSelectionListener(selectionRedirector);
}
firePropertyChange(SELECTION_MODEL_PROPERTY, oldValue,
this.selectionModel);
if (accessibleContext != null) {
accessibleContext.firePropertyChange(
AccessibleContext.ACCESSIBLE_SELECTION_PROPERTY,
Boolean.valueOf(false), Boolean.valueOf(true));
}
}
/**
* Returns the model for selections. This should always return a
* non-null value. If you don't want to allow anything
* to be selected
* set the selection model to null, which forces an empty
* selection model to be used.
*
* @see #setSelectionModel
*/
public TreeSelectionModel getSelectionModel() {
return selectionModel;
}
/**
* Returns the paths (inclusive) between the specified rows. If
* the specified indices are within the viewable set of rows, or
* bound the viewable set of rows, then the indices are
* constrained by the viewable set of rows. If the specified
* indices are not within the viewable set of rows, or do not
* bound the viewable set of rows, then an empty array is
* returned. For example, if the row count is {@code 10}, and this
* method is invoked with {@code -1, 20}, then the specified
* indices are constrained to the viewable set of rows, and this is
* treated as if invoked with {@code 0, 9}. On the other hand, if
* this were invoked with {@code -10, -1}, then the specified
* indices do not bound the viewable set of rows, and an empty
* array is returned.
* TreePath identifying a node
*/
public void removeSelectionPath(TreePath path) {
this.getSelectionModel().removeSelectionPath(path);
}
/**
* Removes the nodes identified by the specified paths from the
* current selection.
*
* @param paths an array of TreePath objects that
* specifies the nodes to remove
*/
public void removeSelectionPaths(TreePath[] paths) {
this.getSelectionModel().removeSelectionPaths(paths);
}
/**
* Removes the row at the index row from the current
* selection.
*
* @param row the row to remove
*/
public void removeSelectionRow(int row) {
int[] rows = { row };
removeSelectionRows(rows);
}
/**
* Removes the rows that are selected at each of the specified
* rows.
*
* @param rows an array of ints specifying display rows, where 0 is
* the first row in the display
*/
public void removeSelectionRows(int[] rows) {
TreeUI ui = getUI();
if(ui != null && rows != null) {
int numRows = rows.length;
TreePath[] paths = new TreePath[numRows];
for(int counter = 0; counter < numRows; counter++)
paths[counter] = ui.getPathForRow(this, rows[counter]);
removeSelectionPaths(paths);
}
}
/**
* Clears the selection.
*/
public void clearSelection() {
getSelectionModel().clearSelection();
}
/**
* Returns true if the selection is currently empty.
*
* @return true if the selection is currently empty
*/
public boolean isSelectionEmpty() {
return getSelectionModel().isSelectionEmpty();
}
/**
* Adds a listener for TreeExpansion events.
*
* @param tel a TreeExpansionListener that will be notified when
* a tree node is expanded or collapsed (a "negative
* expansion")
*/
public void addTreeExpansionListener(TreeExpansionListener tel) {
if (settingUI) {
uiTreeExpansionListener = tel;
}
listenerList.add(TreeExpansionListener.class, tel);
}
/**
* Removes a listener for TreeExpansion events.
*
* @param tel the TreeExpansionListener to remove
*/
public void removeTreeExpansionListener(TreeExpansionListener tel) {
listenerList.remove(TreeExpansionListener.class, tel);
if (uiTreeExpansionListener == tel) {
uiTreeExpansionListener = null;
}
}
/**
* Returns an array of all the TreeExpansionListeners added
* to this JTree with addTreeExpansionListener().
*
* @return all of the TreeExpansionListeners added or an empty
* array if no listeners have been added
* @since 1.4
*/
public TreeExpansionListener[] getTreeExpansionListeners() {
return listenerList.getListeners(TreeExpansionListener.class);
}
/**
* Adds a listener for TreeWillExpand events.
*
* @param tel a TreeWillExpandListener that will be notified
* when a tree node will be expanded or collapsed (a "negative
* expansion")
*/
public void addTreeWillExpandListener(TreeWillExpandListener tel) {
listenerList.add(TreeWillExpandListener.class, tel);
}
/**
* Removes a listener for TreeWillExpand events.
*
* @param tel the TreeWillExpandListener to remove
*/
public void removeTreeWillExpandListener(TreeWillExpandListener tel) {
listenerList.remove(TreeWillExpandListener.class, tel);
}
/**
* Returns an array of all the TreeWillExpandListeners added
* to this JTree with addTreeWillExpandListener().
*
* @return all of the TreeWillExpandListeners added or an empty
* array if no listeners have been added
* @since 1.4
*/
public TreeWillExpandListener[] getTreeWillExpandListeners() {
return listenerList.getListeners(TreeWillExpandListener.class);
}
/**
* Notifies all listeners that have registered interest for
* notification on this event type. The event instance
* is lazily created using the path parameter.
*
* @param path the TreePath indicating the node that was
* expanded
* @see EventListenerList
*/
public void fireTreeExpanded(TreePath path) {
// Guaranteed to return a non-null array
Object[] listeners = listenerList.getListenerList();
TreeExpansionEvent e = null;
if (uiTreeExpansionListener != null) {
e = new TreeExpansionEvent(this, path);
uiTreeExpansionListener.treeExpanded(e);
}
// Process the listeners last to first, notifying
// those that are interested in this event
for (int i = listeners.length-2; i>=0; i-=2) {
if (listeners[i]==TreeExpansionListener.class &&
listeners[i + 1] != uiTreeExpansionListener) {
// Lazily create the event:
if (e == null)
e = new TreeExpansionEvent(this, path);
((TreeExpansionListener)listeners[i+1]).
treeExpanded(e);
}
}
}
/**
* Notifies all listeners that have registered interest for
* notification on this event type. The event instance
* is lazily created using the path parameter.
*
* @param path the TreePath indicating the node that was
* collapsed
* @see EventListenerList
*/
public void fireTreeCollapsed(TreePath path) {
// Guaranteed to return a non-null array
Object[] listeners = listenerList.getListenerList();
TreeExpansionEvent e = null;
if (uiTreeExpansionListener != null) {
e = new TreeExpansionEvent(this, path);
uiTreeExpansionListener.treeCollapsed(e);
}
// Process the listeners last to first, notifying
// those that are interested in this event
for (int i = listeners.length-2; i>=0; i-=2) {
if (listeners[i]==TreeExpansionListener.class &&
listeners[i + 1] != uiTreeExpansionListener) {
// Lazily create the event:
if (e == null)
e = new TreeExpansionEvent(this, path);
((TreeExpansionListener)listeners[i+1]).
treeCollapsed(e);
}
}
}
/**
* Notifies all listeners that have registered interest for
* notification on this event type. The event instance
* is lazily created using the path parameter.
*
* @param path the TreePath indicating the node that was
* expanded
* @see EventListenerList
*/
public void fireTreeWillExpand(TreePath path) throws ExpandVetoException {
// Guaranteed to return a non-null array
Object[] listeners = listenerList.getListenerList();
TreeExpansionEvent e = null;
// Process the listeners last to first, notifying
// those that are interested in this event
for (int i = listeners.length-2; i>=0; i-=2) {
if (listeners[i]==TreeWillExpandListener.class) {
// Lazily create the event:
if (e == null)
e = new TreeExpansionEvent(this, path);
((TreeWillExpandListener)listeners[i+1]).
treeWillExpand(e);
}
}
}
/**
* Notifies all listeners that have registered interest for
* notification on this event type. The event instance
* is lazily created using the path parameter.
*
* @param path the TreePath indicating the node that was
* expanded
* @see EventListenerList
*/
public void fireTreeWillCollapse(TreePath path) throws ExpandVetoException {
// Guaranteed to return a non-null array
Object[] listeners = listenerList.getListenerList();
TreeExpansionEvent e = null;
// Process the listeners last to first, notifying
// those that are interested in this event
for (int i = listeners.length-2; i>=0; i-=2) {
if (listeners[i]==TreeWillExpandListener.class) {
// Lazily create the event:
if (e == null)
e = new TreeExpansionEvent(this, path);
((TreeWillExpandListener)listeners[i+1]).
treeWillCollapse(e);
}
}
}
/**
* Adds a listener for TreeSelection events.
*
* @param tsl the TreeSelectionListener that will be notified
* when a node is selected or deselected (a "negative
* selection")
*/
public void addTreeSelectionListener(TreeSelectionListener tsl) {
listenerList.add(TreeSelectionListener.class,tsl);
if(listenerList.getListenerCount(TreeSelectionListener.class) != 0
&& selectionRedirector == null) {
selectionRedirector = new TreeSelectionRedirector();
selectionModel.addTreeSelectionListener(selectionRedirector);
}
}
/**
* Removes a TreeSelection listener.
*
* @param tsl the TreeSelectionListener to remove
*/
public void removeTreeSelectionListener(TreeSelectionListener tsl) {
listenerList.remove(TreeSelectionListener.class,tsl);
if(listenerList.getListenerCount(TreeSelectionListener.class) == 0
&& selectionRedirector != null) {
selectionModel.removeTreeSelectionListener
(selectionRedirector);
selectionRedirector = null;
}
}
/**
* Returns an array of all the TreeSelectionListeners added
* to this JTree with addTreeSelectionListener().
*
* @return all of the TreeSelectionListeners added or an empty
* array if no listeners have been added
* @since 1.4
*/
public TreeSelectionListener[] getTreeSelectionListeners() {
return listenerList.getListeners(TreeSelectionListener.class);
}
/**
* Notifies all listeners that have registered interest for
* notification on this event type.
*
* @param e the TreeSelectionEvent to be fired;
* generated by the
* TreeSelectionModel
* when a node is selected or deselected
* @see EventListenerList
*/
protected void fireValueChanged(TreeSelectionEvent e) {
// Guaranteed to return a non-null array
Object[] listeners = listenerList.getListenerList();
// Process the listeners last to first, notifying
// those that are interested in this event
for (int i = listeners.length-2; i>=0; i-=2) {
// TreeSelectionEvent e = null;
if (listeners[i]==TreeSelectionListener.class) {
// Lazily create the event:
// if (e == null)
// e = new ListSelectionEvent(this, firstIndex, lastIndex);
((TreeSelectionListener)listeners[i+1]).valueChanged(e);
}
}
}
/**
* Sent when the tree has changed enough that we need to resize
* the bounds, but not enough that we need to remove the
* expanded node set (e.g nodes were expanded or collapsed, or
* nodes were inserted into the tree). You should never have to
* invoke this, the UI will invoke this as it needs to.
*/
public void treeDidChange() {
revalidate();
repaint();
}
/**
* Sets the number of rows that are to be displayed.
* This will only work if the tree is contained in a
* JScrollPane,
* and will adjust the preferred size and size of that scrollpane.
* TreePath into a String, convertValueToText
* is used.
*
* @param prefix the string to test for a match
* @param startingRow the row for starting the search
* @param bias the search direction, either
* Position.Bias.Forward or Position.Bias.Backward.
* @return the TreePath of the next tree element that
* starts with the prefix; otherwise null
* @exception IllegalArgumentException if prefix is null
* or startingRow is out of bounds
* @since 1.4
*/
public TreePath getNextMatch(String prefix, int startingRow,
Position.Bias bias) {
int max = getRowCount();
if (prefix == null) {
throw new IllegalArgumentException();
}
if (startingRow < 0 || startingRow >= max) {
throw new IllegalArgumentException();
}
prefix = prefix.toUpperCase();
// start search from the next/previous element froom the
// selected element
int increment = (bias == Position.Bias.Forward) ? 1 : -1;
int row = startingRow;
do {
TreePath path = getPathForRow(row);
String text = convertValueToText(
path.getLastPathComponent(), isRowSelected(row),
isExpanded(row), true, row, false);
if (text.toUpperCase().startsWith(prefix)) {
return path;
}
row = (row + increment + max) % max;
} while (row != startingRow);
return null;
}
// Serialization support.
private void writeObject(ObjectOutputStream s) throws IOException {
Vector