/*
* Copyright (c) 1997, 2007, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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*/
package javax.swing;
import java.awt.Component;
import java.awt.event.*;
import java.lang.Boolean;
import javax.swing.table.*;
import javax.swing.event.*;
import java.util.EventObject;
import javax.swing.tree.*;
import java.io.Serializable;
/**
* The default editor for table and tree cells.
* <p>
* <strong>Warning:</strong>
* 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<sup><font size="-2">TM</font></sup>
* has been added to the <code>java.beans</code> package.
* Please see {@link java.beans.XMLEncoder}.
*
* @author Alan Chung
* @author Philip Milne
*/
public class DefaultCellEditor extends AbstractCellEditor
implements TableCellEditor, TreeCellEditor {
//
// Instance Variables
//
/** The Swing component being edited. */
protected JComponent editorComponent;
/**
* The delegate class which handles all methods sent from the
* <code>CellEditor</code>.
*/
protected EditorDelegate delegate;
/**
* An integer specifying the number of clicks needed to start editing.
* Even if <code>clickCountToStart</code> is defined as zero, it
* will not initiate until a click occurs.
*/
protected int clickCountToStart = 1;
//
// Constructors
//
/**
* Constructs a <code>DefaultCellEditor</code> that uses a text field.
*
* @param textField a <code>JTextField</code> object
*/
public DefaultCellEditor(final JTextField textField) {
editorComponent = textField;
this.clickCountToStart = 2;
delegate = new EditorDelegate() {
public void setValue(Object value) {
textField.setText((value != null) ? value.toString() : "");
}
public Object getCellEditorValue() {
return textField.getText();
}
};
textField.addActionListener(delegate);
}
/**
* Constructs a <code>DefaultCellEditor</code> object that uses a check box.
*
* @param checkBox a <code>JCheckBox</code> object
*/
public DefaultCellEditor(final JCheckBox checkBox) {
editorComponent = checkBox;
delegate = new EditorDelegate() {
public void setValue(Object value) {
boolean selected = false;
if (value instanceof Boolean) {
selected = ((Boolean)value).booleanValue();
}
else if (value instanceof String) {
selected = value.equals("true");
}
checkBox.setSelected(selected);
}
public Object getCellEditorValue() {
return Boolean.valueOf(checkBox.isSelected());
}
};
checkBox.addActionListener(delegate);
checkBox.setRequestFocusEnabled(false);
}
/**
* Constructs a <code>DefaultCellEditor</code> object that uses a
* combo box.
*
* @param comboBox a <code>JComboBox</code> object
*/
public DefaultCellEditor(final JComboBox comboBox) {
editorComponent = comboBox;
comboBox.putClientProperty("JComboBox.isTableCellEditor", Boolean.TRUE);
delegate = new EditorDelegate() {
public void setValue(Object value) {
comboBox.setSelectedItem(value);
}
public Object getCellEditorValue() {
return comboBox.getSelectedItem();
}
public boolean shouldSelectCell(EventObject anEvent) {
if (anEvent instanceof MouseEvent) {
MouseEvent e = (MouseEvent)anEvent;
return e.getID() != MouseEvent.MOUSE_DRAGGED;
}
return true;
}
public boolean stopCellEditing() {
if (comboBox.isEditable()) {
// Commit edited value.
comboBox.actionPerformed(new ActionEvent(
DefaultCellEditor.this, 0, ""));
}
return super.stopCellEditing();
}
};
comboBox.addActionListener(delegate);
}
/**
* Returns a reference to the editor component.
*
* @return the editor <code>Component</code>
*/
public Component getComponent() {
return editorComponent;
}
//
// Modifying
//
/**
* Specifies the number of clicks needed to start editing.
*
* @param count an int specifying the number of clicks needed to start editing
* @see #getClickCountToStart
*/
public void setClickCountToStart(int count) {
clickCountToStart = count;
}
/**
* Returns the number of clicks needed to start editing.
* @return the number of clicks needed to start editing
*/
public int getClickCountToStart() {
return clickCountToStart;
}
//
// Override the implementations of the superclass, forwarding all methods
// from the CellEditor interface to our delegate.
//
/**
* Forwards the message from the <code>CellEditor</code> to
* the <code>delegate</code>.
* @see EditorDelegate#getCellEditorValue
*/
public Object getCellEditorValue() {
return delegate.getCellEditorValue();
}
/**
* Forwards the message from the <code>CellEditor</code> to
* the <code>delegate</code>.
* @see EditorDelegate#isCellEditable(EventObject)
*/
public boolean isCellEditable(EventObject anEvent) {
return delegate.isCellEditable(anEvent);
}
/**
* Forwards the message from the <code>CellEditor</code> to
* the <code>delegate</code>.
* @see EditorDelegate#shouldSelectCell(EventObject)
*/
public boolean shouldSelectCell(EventObject anEvent) {
return delegate.shouldSelectCell(anEvent);
}
/**
* Forwards the message from the <code>CellEditor</code> to
* the <code>delegate</code>.
* @see EditorDelegate#stopCellEditing
*/
public boolean stopCellEditing() {
return delegate.stopCellEditing();
}
/**
* Forwards the message from the <code>CellEditor</code> to
* the <code>delegate</code>.
* @see EditorDelegate#cancelCellEditing
*/
public void cancelCellEditing() {
delegate.cancelCellEditing();
}
//
// Implementing the TreeCellEditor Interface
//
/** Implements the <code>TreeCellEditor</code> interface. */
public Component getTreeCellEditorComponent(JTree tree, Object value,
boolean isSelected,
boolean expanded,
boolean leaf, int row) {
String stringValue = tree.convertValueToText(value, isSelected,
expanded, leaf, row, false);
delegate.setValue(stringValue);
return editorComponent;
}
//
// Implementing the CellEditor Interface
//
/** Implements the <code>TableCellEditor</code> interface. */
public Component getTableCellEditorComponent(JTable table, Object value,
boolean isSelected,
int row, int column) {
delegate.setValue(value);
if (editorComponent instanceof JCheckBox) {
//in order to avoid a "flashing" effect when clicking a checkbox
//in a table, it is important for the editor to have as a border
//the same border that the renderer has, and have as the background
//the same color as the renderer has. This is primarily only
//needed for JCheckBox since this editor doesn't fill all the
//visual space of the table cell, unlike a text field.
TableCellRenderer renderer = table.getCellRenderer(row, column);
Component c = renderer.getTableCellRendererComponent(table, value,
isSelected, true, row, column);
if (c != null) {
editorComponent.setOpaque(true);
editorComponent.setBackground(c.getBackground());
if (c instanceof JComponent) {
editorComponent.setBorder(((JComponent)c).getBorder());
}
} else {
editorComponent.setOpaque(false);
}
}
return editorComponent;
}
//
// Protected EditorDelegate class
//
/**
* The protected <code>EditorDelegate</code> class.
*/
protected class EditorDelegate implements ActionListener, ItemListener, Serializable {
/** The value of this cell. */
protected Object value;
/**
* Returns the value of this cell.
* @return the value of this cell
*/
public Object getCellEditorValue() {
return value;
}
/**
* Sets the value of this cell.
* @param value the new value of this cell
*/
public void setValue(Object value) {
this.value = value;
}
/**
* Returns true if <code>anEvent</code> is <b>not</b> a
* <code>MouseEvent</code>. Otherwise, it returns true
* if the necessary number of clicks have occurred, and
* returns false otherwise.
*
* @param anEvent the event
* @return true if cell is ready for editing, false otherwise
* @see #setClickCountToStart
* @see #shouldSelectCell
*/
public boolean isCellEditable(EventObject anEvent) {
if (anEvent instanceof MouseEvent) {
return ((MouseEvent)anEvent).getClickCount() >= clickCountToStart;
}
return true;
}
/**
* Returns true to indicate that the editing cell may
* be selected.
*
* @param anEvent the event
* @return true
* @see #isCellEditable
*/
public boolean shouldSelectCell(EventObject anEvent) {
return true;
}
/**
* Returns true to indicate that editing has begun.
*
* @param anEvent the event
*/
public boolean startCellEditing(EventObject anEvent) {
return true;
}
/**
* Stops editing and
* returns true to indicate that editing has stopped.
* This method calls <code>fireEditingStopped</code>.
*
* @return true
*/
public boolean stopCellEditing() {
fireEditingStopped();
return true;
}
/**
* Cancels editing. This method calls <code>fireEditingCanceled</code>.
*/
public void cancelCellEditing() {
fireEditingCanceled();
}
/**
* When an action is performed, editing is ended.
* @param e the action event
* @see #stopCellEditing
*/
public void actionPerformed(ActionEvent e) {
DefaultCellEditor.this.stopCellEditing();
}
/**
* When an item's state changes, editing is ended.
* @param e the action event
* @see #stopCellEditing
*/
public void itemStateChanged(ItemEvent e) {
DefaultCellEditor.this.stopCellEditing();
}
}
} // End of class JCellEditor