////////////////////////////////////////////////////////////////////////////////
// checkstyle: Checks Java source code for adherence to a set of rules.
// Copyright (C) 2001-2002 Oliver Burn
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
////////////////////////////////////////////////////////////////////////////////
/*
* @(#)JTreeTable.java 1.2 98/10/27
*
* Copyright 1997, 1998 by Sun Microsystems, Inc.,
* 901 San Antonio Road, Palo Alto, California, 94303, U.S.A.
* All rights reserved.
*
* This software is the confidential and proprietary information
* of Sun Microsystems, Inc. ("Confidential Information"). You
* shall not disclose such Confidential Information and shall use
* it only in accordance with the terms of the license agreement
* you entered into with Sun.
*/
package com.puppycrawl.tools.checkstyle.gui;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.MouseEvent;
import java.util.EventObject;
import javax.swing.Action;
import javax.swing.AbstractAction;
import javax.swing.JTable;
import javax.swing.JTree;
import javax.swing.KeyStroke;
import javax.swing.ListSelectionModel;
import javax.swing.LookAndFeel;
import javax.swing.UIManager;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.table.TableCellEditor;
import javax.swing.table.TableCellRenderer;
import javax.swing.tree.DefaultTreeCellRenderer;
import javax.swing.tree.DefaultTreeSelectionModel;
import javax.swing.tree.TreeCellRenderer;
import javax.swing.tree.TreeModel;
import javax.swing.tree.TreePath;
/**
* This example shows how to create a simple JTreeTable component,
* by using a JTree as a renderer (and editor) for the cells in a
* particular column in the JTable.
*
* @version 1.2 10/27/98
*
* @author Philip Milne
* @author Scott Violet
* @author Lars K�hne
*/
public class JTreeTable extends JTable
{
/** A subclass of JTree. */
protected TreeTableCellRenderer tree;
public JTreeTable(TreeTableModel treeTableModel)
{
super();
// Create the tree. It will be used as a renderer and editor.
tree = new TreeTableCellRenderer(treeTableModel);
// Install a tableModel representing the visible rows in the tree.
super.setModel(new TreeTableModelAdapter(treeTableModel, tree));
// Force the JTable and JTree to share their row selection models.
ListToTreeSelectionModelWrapper selectionWrapper = new
ListToTreeSelectionModelWrapper();
tree.setSelectionModel(selectionWrapper);
setSelectionModel(selectionWrapper.getListSelectionModel());
// Install the tree editor renderer and editor.
setDefaultRenderer(TreeTableModel.class, tree);
setDefaultEditor(TreeTableModel.class, new TreeTableCellEditor());
// No grid.
setShowGrid(false);
// No intercell spacing
setIntercellSpacing(new Dimension(0, 0));
// And update the height of the trees row to match that of
// the table.
if (tree.getRowHeight() < 1) {
// Metal looks better like this.
setRowHeight(getRowHeight());
}
Action expand = new AbstractAction() {
public void actionPerformed(ActionEvent e) {
TreePath selected = tree.getSelectionPath();
if (tree.isExpanded(selected)) {
tree.collapsePath(selected);
}
else {
tree.expandPath(selected);
}
tree.setSelectionPath(selected);
}
};
KeyStroke stroke = KeyStroke.getKeyStroke("ENTER");
String command = "expand/collapse";
getInputMap().put(stroke, command);
getActionMap().put(command, expand);
}
/**
* Overridden to message super and forward the method to the tree.
* Since the tree is not actually in the component hierarchy it will
* never receive this unless we forward it in this manner.
*/
public void updateUI()
{
super.updateUI();
if (tree != null) {
tree.updateUI();
}
// Use the tree's default foreground and background colors in the
// table.
LookAndFeel.installColorsAndFont(this, "Tree.background",
"Tree.foreground", "Tree.font");
}
/* Workaround for BasicTableUI anomaly. Make sure the UI never tries to
* paint the editor. The UI currently uses different techniques to
* paint the renderers and editors and overriding setBounds() below
* is not the right thing to do for an editor. Returning -1 for the
* editing row in this case, ensures the editor is never painted.
*/
public int getEditingRow()
{
final Class editingClass = getColumnClass(editingColumn);
return (editingClass == TreeTableModel.class) ? -1 : editingRow;
}
/**
* Overridden to pass the new rowHeight to the tree.
*/
public void setRowHeight(int newRowHeight)
{
super.setRowHeight(newRowHeight);
if (tree != null && tree.getRowHeight() != newRowHeight) {
tree.setRowHeight(getRowHeight());
}
}
/**
* @return the tree that is being shared between the model.
*/
public JTree getTree()
{
return tree;
}
/**
* A TreeCellRenderer that displays a JTree.
*/
class TreeTableCellRenderer extends JTree implements
TableCellRenderer
{
/** Last table/tree row asked to renderer. */
protected int visibleRow;
/** creates a new instance */
public TreeTableCellRenderer(TreeModel model)
{
super(model);
}
/**
* updateUI is overridden to set the colors of the Tree's renderer
* to match that of the table.
*/
public void updateUI()
{
super.updateUI();
// Make the tree's cell renderer use the table's cell selection
// colors.
TreeCellRenderer tcr = getCellRenderer();
if (tcr instanceof DefaultTreeCellRenderer) {
DefaultTreeCellRenderer dtcr = ((DefaultTreeCellRenderer) tcr);
// For 1.1 uncomment this, 1.2 has a bug that will cause an
// exception to be thrown if the border selection color is
// null.
// dtcr.setBorderSelectionColor(null);
dtcr.setTextSelectionColor(UIManager.getColor
("Table.selectionForeground"));
dtcr.setBackgroundSelectionColor(UIManager.getColor
("Table.selectionBackground"));
}
}
/**
* Sets the row height of the tree, and forwards the row height to
* the table.
*/
public void setRowHeight(int newRowHeight)
{
if (newRowHeight > 0) {
super.setRowHeight(newRowHeight);
if (JTreeTable.this != null &&
JTreeTable.this.getRowHeight() != newRowHeight) {
JTreeTable.this.setRowHeight(getRowHeight());
}
}
}
/**
* This is overridden to set the height to match that of the JTable.
*/
public void setBounds(int x, int y, int w, int h)
{
super.setBounds(x, 0, w, JTreeTable.this.getHeight());
}
/**
* Sublcassed to translate the graphics such that the last visible
* row will be drawn at 0,0.
*/
public void paint(Graphics g)
{
g.translate(0, -visibleRow * getRowHeight());
super.paint(g);
}
/**
* TreeCellRenderer method. Overridden to update the visible row.
* @see TableCellRenderer
*/
public Component getTableCellRendererComponent(JTable table,
Object value,
boolean isSelected,
boolean hasFocus,
int row, int column)
{
if (isSelected) {
setBackground(table.getSelectionBackground());
} else {
setBackground(table.getBackground());
}
visibleRow = row;
return this;
}
}
/**
* TreeTableCellEditor implementation. Component returned is the
* JTree.
*/
public class TreeTableCellEditor extends AbstractCellEditor implements
TableCellEditor
{
public Component getTableCellEditorComponent(JTable table,
Object value,
boolean isSelected,
int r, int c)
{
return tree;
}
/**
* Overridden to return false, and if the event is a mouse event
* it is forwarded to the tree.<p>
* The behavior for this is debatable, and should really be offered
* as a property. By returning false, all keyboard actions are
* implemented in terms of the table. By returning true, the
* tree would get a chance to do something with the keyboard
* events. For the most part this is ok. But for certain keys,
* such as left/right, the tree will expand/collapse where as
* the table focus should really move to a different column. Page
* up/down should also be implemented in terms of the table.
* By returning false this also has the added benefit that clicking
* outside of the bounds of the tree node, but still in the tree
* column will select the row, whereas if this returned true
* that wouldn't be the case.
* <p>By returning false we are also enforcing the policy that
* the tree will never be editable (at least by a key sequence).
*
* @see TableCellEditor
*/
public boolean isCellEditable(EventObject e)
{
if (e instanceof MouseEvent) {
for (int counter = getColumnCount() - 1; counter >= 0;
counter--) {
if (getColumnClass(counter) == TreeTableModel.class) {
MouseEvent me = (MouseEvent) e;
MouseEvent newME = new MouseEvent(tree, me.getID(),
me.getWhen(), me.getModifiers(),
me.getX() - getCellRect(0, counter, true).x,
me.getY(), me.getClickCount(),
me.isPopupTrigger());
tree.dispatchEvent(newME);
break;
}
}
}
return false;
}
}
/**
* ListToTreeSelectionModelWrapper extends DefaultTreeSelectionModel
* to listen for changes in the ListSelectionModel it maintains. Once
* a change in the ListSelectionModel happens, the paths are updated
* in the DefaultTreeSelectionModel.
*/
class ListToTreeSelectionModelWrapper extends DefaultTreeSelectionModel
{
/** Set to true when we are updating the ListSelectionModel. */
protected boolean updatingListSelectionModel;
public ListToTreeSelectionModelWrapper()
{
super();
getListSelectionModel().addListSelectionListener
(createListSelectionListener());
}
/**
* Returns the list selection model. ListToTreeSelectionModelWrapper
* listens for changes to this model and updates the selected paths
* accordingly.
*
* @return the list selection model
*/
ListSelectionModel getListSelectionModel()
{
return listSelectionModel;
}
/**
* This is overridden to set <code>updatingListSelectionModel</code>
* and message super. This is the only place DefaultTreeSelectionModel
* alters the ListSelectionModel.
*/
public void resetRowSelection()
{
if (!updatingListSelectionModel) {
updatingListSelectionModel = true;
try {
super.resetRowSelection();
} finally {
updatingListSelectionModel = false;
}
}
// Notice how we don't message super if
// updatingListSelectionModel is true. If
// updatingListSelectionModel is true, it implies the
// ListSelectionModel has already been updated and the
// paths are the only thing that needs to be updated.
}
/**
* Creates and returns an instance of ListSelectionHandler.
*/
private ListSelectionListener createListSelectionListener()
{
return new ListSelectionHandler();
}
/**
* If <code>updatingListSelectionModel</code> is false, this will
* reset the selected paths from the selected rows in the list
* selection model.
*/
protected void updateSelectedPathsFromSelectedRows()
{
if (!updatingListSelectionModel) {
updatingListSelectionModel = true;
try {
// This is way expensive, ListSelectionModel needs an
// enumerator for iterating.
int min = listSelectionModel.getMinSelectionIndex();
int max = listSelectionModel.getMaxSelectionIndex();
clearSelection();
if (min != -1 && max != -1) {
for (int counter = min; counter <= max; counter++) {
if (listSelectionModel.isSelectedIndex(counter)) {
TreePath selPath = tree.getPathForRow
(counter);
if (selPath != null) {
addSelectionPath(selPath);
}
}
}
}
} finally {
updatingListSelectionModel = false;
}
}
}
/**
* Class responsible for calling updateSelectedPathsFromSelectedRows
* when the selection of the list changse.
*/
class ListSelectionHandler implements ListSelectionListener
{
public void valueChanged(ListSelectionEvent e)
{
updateSelectedPathsFromSelectedRows();
}
}
}
}