jdk-sandbox: comparison jdk/src/share/classes/javax/swing/JComboBox.java

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+/*
+* Copyright 1997-2007 Sun Microsystems, Inc.  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.  Sun designates this
+* particular file as subject to the "Classpath" exception as provided
+* by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+* CA 95054 USA or visit www.sun.com if you need additional information or
+* have any questions.
+*/
+package javax.swing;
+import java.beans.*;
+import java.util.*;
+import java.awt.*;
+import java.awt.event.*;
+import java.io.Serializable;
+import java.io.ObjectOutputStream;
+import java.io.ObjectInputStream;
+import java.io.IOException;
+import javax.swing.event.*;
+import javax.swing.plaf.*;
+import javax.swing.border.*;
+import javax.accessibility.*;
+/**
+* A component that combines a button or editable field and a drop-down list.
+* The user can select a value from the drop-down list, which appears at the
+* user's request. If you make the combo box editable, then the combo box
+* includes an editable field into which the user can type a value.
+* <p>
+* <strong>Warning:</strong> Swing is not thread safe. For more
+* information see <a
+* href="package-summary.html#threading">Swing's Threading
+* Policy</a>.
+* <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}.
+*
+* <p>
+* See <a href="http://java.sun.com/docs/books/tutorial/uiswing/components/combobox.html">How to Use Combo Boxes</a>
+* in <a href="http://java.sun.com/Series/Tutorial/index.html"><em>The Java Tutorial</em></a>
+* for further information.
+* <p>
+* @see ComboBoxModel
+* @see DefaultComboBoxModel
+*
+* @beaninfo
+*   attribute: isContainer false
+* description: A combination of a text field and a drop-down list.
+*
+* @author Arnaud Weber
+* @author Mark Davidson
+*/
+public class JComboBox extends JComponent
+implements ItemSelectable,ListDataListener,ActionListener, Accessible {
+/**
+* @see #getUIClassID
+* @see #readObject
+*/
+private static final String uiClassID = "ComboBoxUI";
+/**
+* This protected field is implementation specific. Do not access directly
+* or override. Use the accessor methods instead.
+*
+* @see #getModel
+* @see #setModel
+*/
+protected ComboBoxModel    dataModel;
+/**
+* This protected field is implementation specific. Do not access directly
+* or override. Use the accessor methods instead.
+*
+* @see #getRenderer
+* @see #setRenderer
+*/
+protected ListCellRenderer renderer;
+/**
+* This protected field is implementation specific. Do not access directly
+* or override. Use the accessor methods instead.
+*
+* @see #getEditor
+* @see #setEditor
+*/
+protected ComboBoxEditor       editor;
+/**
+* This protected field is implementation specific. Do not access directly
+* or override. Use the accessor methods instead.
+*
+* @see #getMaximumRowCount
+* @see #setMaximumRowCount
+*/
+protected int maximumRowCount = 8;
+/**
+* This protected field is implementation specific. Do not access directly
+* or override. Use the accessor methods instead.
+*
+* @see #isEditable
+* @see #setEditable
+*/
+protected boolean isEditable  = false;
+/**
+* This protected field is implementation specific. Do not access directly
+* or override. Use the accessor methods instead.
+*
+* @see #setKeySelectionManager
+* @see #getKeySelectionManager
+*/
+protected KeySelectionManager keySelectionManager = null;
+/**
+* This protected field is implementation specific. Do not access directly
+* or override. Use the accessor methods instead.
+*
+* @see #setActionCommand
+* @see #getActionCommand
+*/
+protected String actionCommand = "comboBoxChanged";
+/**
+* This protected field is implementation specific. Do not access directly
+* or override. Use the accessor methods instead.
+*
+* @see #setLightWeightPopupEnabled
+* @see #isLightWeightPopupEnabled
+*/
+protected boolean lightWeightPopupEnabled = JPopupMenu.getDefaultLightWeightPopupEnabled();
+/**
+* This protected field is implementation specific. Do not access directly
+* or override.
+*/
+protected Object selectedItemReminder = null;
+private Object prototypeDisplayValue;
+// Flag to ensure that infinite loops do not occur with ActionEvents.
+private boolean firingActionEvent = false;
+// Flag to ensure the we don't get multiple ActionEvents on item selection.
+private boolean selectingItem = false;
+/**
+* Creates a <code>JComboBox</code> that takes its items from an
+* existing <code>ComboBoxModel</code>.  Since the
+* <code>ComboBoxModel</code> is provided, a combo box created using
+* this constructor does not create a default combo box model and
+* may impact how the insert, remove and add methods behave.
+*
+* @param aModel the <code>ComboBoxModel</code> that provides the
+*          displayed list of items
+* @see DefaultComboBoxModel
+*/
+public JComboBox(ComboBoxModel aModel) {
+super();
+setModel(aModel);
+init();
+}
+/**
+* Creates a <code>JComboBox</code> that contains the elements
+* in the specified array.  By default the first item in the array
+* (and therefore the data model) becomes selected.
+*
+* @param items  an array of objects to insert into the combo box
+* @see DefaultComboBoxModel
+*/
+public JComboBox(final Object items[]) {
+super();
+setModel(new DefaultComboBoxModel(items));
+init();
+}
+/**
+* Creates a <code>JComboBox</code> that contains the elements
+* in the specified Vector.  By default the first item in the vector
+* (and therefore the data model) becomes selected.
+*
+* @param items  an array of vectors to insert into the combo box
+* @see DefaultComboBoxModel
+*/
+public JComboBox(Vector<?> items) {
+super();
+setModel(new DefaultComboBoxModel(items));
+init();
+}
+/**
+* Creates a <code>JComboBox</code> with a default data model.
+* The default data model is an empty list of objects.
+* Use <code>addItem</code> to add items.  By default the first item
+* in the data model becomes selected.
+*
+* @see DefaultComboBoxModel
+*/
+public JComboBox() {
+super();
+setModel(new DefaultComboBoxModel());
+init();
+}
+private void init() {
+installAncestorListener();
+setOpaque(true);
+updateUI();
+}
+protected void installAncestorListener() {
+addAncestorListener(new AncestorListener(){
+public void ancestorAdded(AncestorEvent event){ hidePopup();}
+public void ancestorRemoved(AncestorEvent event){ hidePopup();}
+public void ancestorMoved(AncestorEvent event){
+if (event.getSource() != JComboBox.this)
+hidePopup();
+}});
+}
+/**
+* Sets the L&F object that renders this component.
+*
+* @param ui  the <code>ComboBoxUI</code> 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(ComboBoxUI ui) {
+super.setUI(ui);
+}
+/**
+* Resets the UI property to a value from the current look and feel.
+*
+* @see JComponent#updateUI
+*/
+public void updateUI() {
+setUI((ComboBoxUI)UIManager.getUI(this));
+ListCellRenderer renderer = getRenderer();
+if (renderer instanceof Component) {
+SwingUtilities.updateComponentTreeUI((Component)renderer);
+}
+}
+/**
+* Returns the name of the L&F class that renders this component.
+*
+* @return the string "ComboBoxUI"
+* @see JComponent#getUIClassID
+* @see UIDefaults#getUI
+*/
+public String getUIClassID() {
+return uiClassID;
+}
+/**
+* Returns the L&F object that renders this component.
+*
+* @return the ComboBoxUI object that renders this component
+*/
+public ComboBoxUI getUI() {
+return(ComboBoxUI)ui;
+}
+/**
+* Sets the data model that the <code>JComboBox</code> uses to obtain
+* the list of items.
+*
+* @param aModel the <code>ComboBoxModel</code> that provides the
+*  displayed list of items
+*
+* @beaninfo
+*        bound: true
+*  description: Model that the combo box uses to get data to display.
+*/
+public void setModel(ComboBoxModel aModel) {
+ComboBoxModel oldModel = dataModel;
+if (oldModel != null) {
+oldModel.removeListDataListener(this);
+}
+dataModel = aModel;
+dataModel.addListDataListener(this);
+// set the current selected item.
+selectedItemReminder = dataModel.getSelectedItem();
+firePropertyChange( "model", oldModel, dataModel);
+}
+/**
+* Returns the data model currently used by the <code>JComboBox</code>.
+*
+* @return the <code>ComboBoxModel</code> that provides the displayed
+*                  list of items
+*/
+public ComboBoxModel getModel() {
+return dataModel;
+}
+/*
+* Properties
+*/
+/**
+* Sets the <code>lightWeightPopupEnabled</code> property, which
+* provides a hint as to whether or not a lightweight
+* <code>Component</code> should be used to contain the
+* <code>JComboBox</code>, versus a heavyweight
+* <code>Component</code> such as a <code>Panel</code>
+* or a <code>Window</code>.  The decision of lightweight
+* versus heavyweight is ultimately up to the
+* <code>JComboBox</code>.  Lightweight windows are more
+* efficient than heavyweight windows, but lightweight
+* and heavyweight components do not mix well in a GUI.
+* If your application mixes lightweight and heavyweight
+* components, you should disable lightweight popups.
+* The default value for the <code>lightWeightPopupEnabled</code>
+* property is <code>true</code>, unless otherwise specified
+* by the look and feel.  Some look and feels always use
+* heavyweight popups, no matter what the value of this property.
+* <p>
+* See the article <a href="http://java.sun.com/products/jfc/tsc/articles/mixing/index.html">Mixing Heavy and Light Components</a>
+* on <a href="http://java.sun.com/products/jfc/tsc">
+* <em>The Swing Connection</em></a>
+* This method fires a property changed event.
+*
+* @param aFlag if <code>true</code>, lightweight popups are desired
+*
+* @beaninfo
+*        bound: true
+*       expert: true
+*  description: Set to <code>false</code> to require heavyweight popups.
+*/
+public void setLightWeightPopupEnabled(boolean aFlag) {
+boolean oldFlag = lightWeightPopupEnabled;
+lightWeightPopupEnabled = aFlag;
+firePropertyChange("lightWeightPopupEnabled", oldFlag, lightWeightPopupEnabled);
+}
+/**
+* Gets the value of the <code>lightWeightPopupEnabled</code>
+* property.
+*
+* @return the value of the <code>lightWeightPopupEnabled</code>
+*    property
+* @see #setLightWeightPopupEnabled
+*/
+public boolean isLightWeightPopupEnabled() {
+return lightWeightPopupEnabled;
+}
+/**
+* Determines whether the <code>JComboBox</code> field is editable.
+* An editable <code>JComboBox</code> allows the user to type into the
+* field or selected an item from the list to initialize the field,
+* after which it can be edited. (The editing affects only the field,
+* the list item remains intact.) A non editable <code>JComboBox</code>
+* displays the selected item in the field,
+* but the selection cannot be modified.
+*
+* @param aFlag a boolean value, where true indicates that the
+*                  field is editable
+*
+* @beaninfo
+*        bound: true
+*    preferred: true
+*  description: If true, the user can type a new value in the combo box.
+*/
+public void setEditable(boolean aFlag) {
+boolean oldFlag = isEditable;
+isEditable = aFlag;
+firePropertyChange( "editable", oldFlag, isEditable );
+}
+/**
+* Returns true if the <code>JComboBox</code> is editable.
+* By default, a combo box is not editable.
+*
+* @return true if the <code>JComboBox</code> is editable, else false
+*/
+public boolean isEditable() {
+return isEditable;
+}
+/**
+* Sets the maximum number of rows the <code>JComboBox</code> displays.
+* If the number of objects in the model is greater than count,
+* the combo box uses a scrollbar.
+*
+* @param count an integer specifying the maximum number of items to
+*              display in the list before using a scrollbar
+* @beaninfo
+*        bound: true
+*    preferred: true
+*  description: The maximum number of rows the popup should have
+*/
+public void setMaximumRowCount(int count) {
+int oldCount = maximumRowCount;
+maximumRowCount = count;
+firePropertyChange( "maximumRowCount", oldCount, maximumRowCount );
+}
+/**
+* Returns the maximum number of items the combo box can display
+* without a scrollbar
+*
+* @return an integer specifying the maximum number of items that are
+*         displayed in the list before using a scrollbar
+*/
+public int getMaximumRowCount() {
+return maximumRowCount;
+}
+/**
+* Sets the renderer that paints the list items and the item selected from the list in
+* the JComboBox field. The renderer is used if the JComboBox is not
+* editable. If it is editable, the editor is used to render and edit
+* the selected item.
+* <p>
+* The default renderer displays a string or an icon.
+* Other renderers can handle graphic images and composite items.
+* <p>
+* To display the selected item,
+* <code>aRenderer.getListCellRendererComponent</code>
+* is called, passing the list object and an index of -1.
+*
+* @param aRenderer  the <code>ListCellRenderer</code> that
+*                  displays the selected item
+* @see #setEditor
+* @beaninfo
+*      bound: true
+*     expert: true
+*  description: The renderer that paints the item selected in the list.
+*/
+public void setRenderer(ListCellRenderer aRenderer) {
+ListCellRenderer oldRenderer = renderer;
+renderer = aRenderer;
+firePropertyChange( "renderer", oldRenderer, renderer );
+invalidate();
+}
+/**
+* Returns the renderer used to display the selected item in the
+* <code>JComboBox</code> field.
+*
+* @return  the <code>ListCellRenderer</code> that displays
+*                  the selected item.
+*/
+public ListCellRenderer getRenderer() {
+return renderer;
+}
+/**
+* Sets the editor used to paint and edit the selected item in the
+* <code>JComboBox</code> field.  The editor is used only if the
+* receiving <code>JComboBox</code> is editable. If not editable,
+* the combo box uses the renderer to paint the selected item.
+*
+* @param anEditor  the <code>ComboBoxEditor</code> that
+*                  displays the selected item
+* @see #setRenderer
+* @beaninfo
+*     bound: true
+*    expert: true
+*  description: The editor that combo box uses to edit the current value
+*/
+public void setEditor(ComboBoxEditor anEditor) {
+ComboBoxEditor oldEditor = editor;
+if ( editor != null ) {
+editor.removeActionListener(this);
+}
+editor = anEditor;
+if ( editor != null ) {
+editor.addActionListener(this);
+}
+firePropertyChange( "editor", oldEditor, editor );
+}
+/**
+* Returns the editor used to paint and edit the selected item in the
+* <code>JComboBox</code> field.
+*
+* @return the <code>ComboBoxEditor</code> that displays the selected item
+*/
+public ComboBoxEditor getEditor() {
+return editor;
+}
+//
+// Selection
+//
+/**
+* Sets the selected item in the combo box display area to the object in
+* the argument.
+* If <code>anObject</code> is in the list, the display area shows
+* <code>anObject</code> selected.
+* <p>
+* If <code>anObject</code> is <i>not</i> in the list and the combo box is
+* uneditable, it will not change the current selection. For editable
+* combo boxes, the selection will change to <code>anObject</code>.
+* <p>
+* If this constitutes a change in the selected item,
+* <code>ItemListener</code>s added to the combo box will be notified with
+* one or two <code>ItemEvent</code>s.
+* If there is a current selected item, an <code>ItemEvent</code> will be
+* fired and the state change will be <code>ItemEvent.DESELECTED</code>.
+* If <code>anObject</code> is in the list and is not currently selected
+* then an <code>ItemEvent</code> will be fired and the state change will
+* be <code>ItemEvent.SELECTED</code>.
+* <p>
+* <code>ActionListener</code>s added to the combo box will be notified
+* with an <code>ActionEvent</code> when this method is called.
+*
+* @param anObject  the list object to select; use <code>null</code> to
+clear the selection
+* @beaninfo
+*    preferred:   true
+*    description: Sets the selected item in the JComboBox.
+*/
+public void setSelectedItem(Object anObject) {
+Object oldSelection = selectedItemReminder;
+Object objectToSelect = anObject;
+if (oldSelection == null || !oldSelection.equals(anObject)) {
+if (anObject != null && !isEditable()) {
+// For non editable combo boxes, an invalid selection
+// will be rejected.
+boolean found = false;
+for (int i = 0; i < dataModel.getSize(); i++) {
+Object element = dataModel.getElementAt(i);
+if (anObject.equals(element)) {
+found = true;
+objectToSelect = element;
+break;
+}
+}
+if (!found) {
+return;
+}
+}
+// Must toggle the state of this flag since this method
+// call may result in ListDataEvents being fired.
+selectingItem = true;
+dataModel.setSelectedItem(objectToSelect);
+selectingItem = false;
+if (selectedItemReminder != dataModel.getSelectedItem()) {
+// in case a users implementation of ComboBoxModel
+// doesn't fire a ListDataEvent when the selection
+// changes.
+selectedItemChanged();
+}
+}
+fireActionEvent();
+}
+/**
+* Returns the current selected item.
+* <p>
+* If the combo box is editable, then this value may not have been added
+* to the combo box with <code>addItem</code>, <code>insertItemAt</code>
+* or the data constructors.
+*
+* @return the current selected Object
+* @see #setSelectedItem
+*/
+public Object getSelectedItem() {
+return dataModel.getSelectedItem();
+}
+/**
+* Selects the item at index <code>anIndex</code>.
+*
+* @param anIndex an integer specifying the list item to select,
+*                  where 0 specifies the first item in the list and -1 indicates no selection
+* @exception IllegalArgumentException if <code>anIndex</code> < -1 or
+*                  <code>anIndex</code> is greater than or equal to size
+* @beaninfo
+*   preferred: true
+*  description: The item at index is selected.
+*/
+public void setSelectedIndex(int anIndex) {
+int size = dataModel.getSize();
+if ( anIndex == -1 ) {
+setSelectedItem( null );
+} else if ( anIndex < -1 || anIndex >= size ) {
+throw new IllegalArgumentException("setSelectedIndex: " + anIndex + " out of bounds");
+} else {
+setSelectedItem(dataModel.getElementAt(anIndex));
+}
+}
+/**
+* Returns the first item in the list that matches the given item.
+* The result is not always defined if the <code>JComboBox</code>
+* allows selected items that are not in the list.
+* Returns -1 if there is no selected item or if the user specified
+* an item which is not in the list.
+* @return an integer specifying the currently selected list item,
+*                  where 0 specifies
+*                  the first item in the list;
+*                  or -1 if no item is selected or if
+*                  the currently selected item is not in the list
+*/
+public int getSelectedIndex() {
+Object sObject = dataModel.getSelectedItem();
+int i,c;
+Object obj;
+for ( i=0,c=dataModel.getSize();i<c;i++ ) {
+obj = dataModel.getElementAt(i);
+if ( obj != null && obj.equals(sObject) )
+return i;
+}
+return -1;
+}
+/**
+* Returns the "prototypical display" value - an Object used
+* for the calculation of the display height and width.
+*
+* @return the value of the <code>prototypeDisplayValue</code> property
+* @see #setPrototypeDisplayValue
+* @since 1.4
+*/
+public Object getPrototypeDisplayValue() {
+return prototypeDisplayValue;
+}
+/**
+* Sets the prototype display value used to calculate the size of the display
+* for the UI portion.
+* <p>
+* If a prototype display value is specified, the preferred size of
+* the combo box is calculated by configuring the renderer with the
+* prototype display value and obtaining its preferred size. Specifying
+* the preferred display value is often useful when the combo box will be
+* displaying large amounts of data. If no prototype display value has
+* been specified, the renderer must be configured for each value from
+* the model and its preferred size obtained, which can be
+* relatively expensive.
+*
+* @param prototypeDisplayValue
+* @see #getPrototypeDisplayValue
+* @since 1.4
+* @beaninfo
+*       bound: true
+*   attribute: visualUpdate true
+* description: The display prototype value, used to compute display width and height.
+*/
+public void setPrototypeDisplayValue(Object prototypeDisplayValue) {
+Object oldValue = this.prototypeDisplayValue;
+this.prototypeDisplayValue = prototypeDisplayValue;
+firePropertyChange("prototypeDisplayValue", oldValue, prototypeDisplayValue);
+}
+/**
+* Adds an item to the item list.
+* This method works only if the <code>JComboBox</code> uses a
+* mutable data model.
+* <p>
+* <strong>Warning:</strong>
+* Focus and keyboard navigation problems may arise if you add duplicate
+* String objects. A workaround is to add new objects instead of String
+* objects and make sure that the toString() method is defined.
+* For example:
+* <pre>
+*   comboBox.addItem(makeObj("Item 1"));
+*   comboBox.addItem(makeObj("Item 1"));
+*   ...
+*   private Object makeObj(final String item)  {
+*     return new Object() { public String toString() { return item; } };
+*   }
+* </pre>
+*
+* @param anObject the Object to add to the list
+* @see MutableComboBoxModel
+*/
+public void addItem(Object anObject) {
+checkMutableComboBoxModel();
+((MutableComboBoxModel)dataModel).addElement(anObject);
+}
+/**
+* Inserts an item into the item list at a given index.
+* This method works only if the <code>JComboBox</code> uses a
+* mutable data model.
+*
+* @param anObject the <code>Object</code> to add to the list
+* @param index    an integer specifying the position at which
+*                  to add the item
+* @see MutableComboBoxModel
+*/
+public void insertItemAt(Object anObject, int index) {
+checkMutableComboBoxModel();
+((MutableComboBoxModel)dataModel).insertElementAt(anObject,index);
+}
+/**
+* Removes an item from the item list.
+* This method works only if the <code>JComboBox</code> uses a
+* mutable data model.
+*
+* @param anObject  the object to remove from the item list
+* @see MutableComboBoxModel
+*/
+public void removeItem(Object anObject) {
+checkMutableComboBoxModel();
+((MutableComboBoxModel)dataModel).removeElement(anObject);
+}
+/**
+* Removes the item at <code>anIndex</code>
+* This method works only if the <code>JComboBox</code> uses a
+* mutable data model.
+*
+* @param anIndex  an int specifying the index of the item to remove,
+*                  where 0
+*                  indicates the first item in the list
+* @see MutableComboBoxModel
+*/
+public void removeItemAt(int anIndex) {
+checkMutableComboBoxModel();
+((MutableComboBoxModel)dataModel).removeElementAt( anIndex );
+}
+/**
+* Removes all items from the item list.
+*/
+public void removeAllItems() {
+checkMutableComboBoxModel();
+MutableComboBoxModel model = (MutableComboBoxModel)dataModel;
+int size = model.getSize();
+if ( model instanceof DefaultComboBoxModel ) {
+((DefaultComboBoxModel)model).removeAllElements();
+}
+else {
+for ( int i = 0; i < size; ++i ) {
+Object element = model.getElementAt( 0 );
+model.removeElement( element );
+}
+}
+selectedItemReminder = null;
+if (isEditable()) {
+editor.setItem(null);
+}
+}
+/**
+* Checks that the <code>dataModel</code> is an instance of
+* <code>MutableComboBoxModel</code>.  If not, it throws an exception.
+* @exception RuntimeException if <code>dataModel</code> is not an
+*          instance of <code>MutableComboBoxModel</code>.
+*/
+void checkMutableComboBoxModel() {
+if ( !(dataModel instanceof MutableComboBoxModel) )
+throw new RuntimeException("Cannot use this method with a non-Mutable data model.");
+}
+/**
+* Causes the combo box to display its popup window.
+* @see #setPopupVisible
+*/
+public void showPopup() {
+setPopupVisible(true);
+}
+/**
+* Causes the combo box to close its popup window.
+* @see #setPopupVisible
+*/
+public void hidePopup() {
+setPopupVisible(false);
+}
+/**
+* Sets the visibility of the popup.
+*/
+public void setPopupVisible(boolean v) {
+getUI().setPopupVisible(this, v);
+}
+/**
+* Determines the visibility of the popup.
+*
+* @return true if the popup is visible, otherwise returns false
+*/
+public boolean isPopupVisible() {
+return getUI().isPopupVisible(this);
+}
+/** Selection **/
+/**
+* Adds an <code>ItemListener</code>.
+* <p>
+* <code>aListener</code> will receive one or two <code>ItemEvent</code>s when
+* the selected item changes.
+*
+* @param aListener the <code>ItemListener</code> that is to be notified
+* @see #setSelectedItem
+*/
+public void addItemListener(ItemListener aListener) {
+listenerList.add(ItemListener.class,aListener);
+}
+/** Removes an <code>ItemListener</code>.
+*
+* @param aListener  the <code>ItemListener</code> to remove
+*/
+public void removeItemListener(ItemListener aListener) {
+listenerList.remove(ItemListener.class,aListener);
+}
+/**
+* Returns an array of all the <code>ItemListener</code>s added
+* to this JComboBox with addItemListener().
+*
+* @return all of the <code>ItemListener</code>s added or an empty
+*         array if no listeners have been added
+* @since 1.4
+*/
+public ItemListener[] getItemListeners() {
+return (ItemListener[])listenerList.getListeners(ItemListener.class);
+}
+/**
+* Adds an <code>ActionListener</code>.
+* <p>
+* The <code>ActionListener</code> will receive an <code>ActionEvent</code>
+* when a selection has been made. If the combo box is editable, then
+* an <code>ActionEvent</code> will be fired when editing has stopped.
+*
+* @param l  the <code>ActionListener</code> that is to be notified
+* @see #setSelectedItem
+*/
+public void addActionListener(ActionListener l) {
+listenerList.add(ActionListener.class,l);
+}
+/** Removes an <code>ActionListener</code>.
+*
+* @param l  the <code>ActionListener</code> to remove
+*/
+public void removeActionListener(ActionListener l) {
+if ((l != null) && (getAction() == l)) {
+setAction(null);
+} else {
+listenerList.remove(ActionListener.class, l);
+}
+}
+/**
+* Returns an array of all the <code>ActionListener</code>s added
+* to this JComboBox with addActionListener().
+*
+* @return all of the <code>ActionListener</code>s added or an empty
+*         array if no listeners have been added
+* @since 1.4
+*/
+public ActionListener[] getActionListeners() {
+return (ActionListener[])listenerList.getListeners(
+ActionListener.class);
+}
+/**
+* Adds a <code>PopupMenu</code> listener which will listen to notification
+* messages from the popup portion of the combo box.
+* <p>
+* For all standard look and feels shipped with Java, the popup list
+* portion of combo box is implemented as a <code>JPopupMenu</code>.
+* A custom look and feel may not implement it this way and will
+* therefore not receive the notification.
+*
+* @param l  the <code>PopupMenuListener</code> to add
+* @since 1.4
+*/
+public void addPopupMenuListener(PopupMenuListener l) {
+listenerList.add(PopupMenuListener.class,l);
+}
+/**
+* Removes a <code>PopupMenuListener</code>.
+*
+* @param l  the <code>PopupMenuListener</code> to remove
+* @see #addPopupMenuListener
+* @since 1.4
+*/
+public void removePopupMenuListener(PopupMenuListener l) {
+listenerList.remove(PopupMenuListener.class,l);
+}
+/**
+* Returns an array of all the <code>PopupMenuListener</code>s added
+* to this JComboBox with addPopupMenuListener().
+*
+* @return all of the <code>PopupMenuListener</code>s added or an empty
+*         array if no listeners have been added
+* @since 1.4
+*/
+public PopupMenuListener[] getPopupMenuListeners() {
+return (PopupMenuListener[])listenerList.getListeners(
+PopupMenuListener.class);
+}
+/**
+* Notifies <code>PopupMenuListener</code>s that the popup portion of the
+* combo box will become visible.
+* <p>
+* This method is public but should not be called by anything other than
+* the UI delegate.
+* @see #addPopupMenuListener
+* @since 1.4
+*/
+public void firePopupMenuWillBecomeVisible() {
+Object[] listeners = listenerList.getListenerList();
+PopupMenuEvent e=null;
+for (int i = listeners.length-2; i>=0; i-=2) {
+if (listeners[i]==PopupMenuListener.class) {
+if (e == null)
+e = new PopupMenuEvent(this);
+((PopupMenuListener)listeners[i+1]).popupMenuWillBecomeVisible(e);
+}
+}
+}
+/**
+* Notifies <code>PopupMenuListener</code>s that the popup portion of the
+* combo box has become invisible.
+* <p>
+* This method is public but should not be called by anything other than
+* the UI delegate.
+* @see #addPopupMenuListener
+* @since 1.4
+*/
+public void firePopupMenuWillBecomeInvisible() {
+Object[] listeners = listenerList.getListenerList();
+PopupMenuEvent e=null;
+for (int i = listeners.length-2; i>=0; i-=2) {
+if (listeners[i]==PopupMenuListener.class) {
+if (e == null)
+e = new PopupMenuEvent(this);
+((PopupMenuListener)listeners[i+1]).popupMenuWillBecomeInvisible(e);
+}
+}
+}
+/**
+* Notifies <code>PopupMenuListener</code>s that the popup portion of the
+* combo box has been canceled.
+* <p>
+* This method is public but should not be called by anything other than
+* the UI delegate.
+* @see #addPopupMenuListener
+* @since 1.4
+*/
+public void firePopupMenuCanceled() {
+Object[] listeners = listenerList.getListenerList();
+PopupMenuEvent e=null;
+for (int i = listeners.length-2; i>=0; i-=2) {
+if (listeners[i]==PopupMenuListener.class) {
+if (e == null)
+e = new PopupMenuEvent(this);
+((PopupMenuListener)listeners[i+1]).popupMenuCanceled(e);
+}
+}
+}
+/**
+* Sets the action command that should be included in the event
+* sent to action listeners.
+*
+* @param aCommand  a string containing the "command" that is sent
+*                  to action listeners; the same listener can then
+*                  do different things depending on the command it
+*                  receives
+*/
+public void setActionCommand(String aCommand) {
+actionCommand = aCommand;
+}
+/**
+* Returns the action command that is included in the event sent to
+* action listeners.
+*
+* @return  the string containing the "command" that is sent
+*          to action listeners.
+*/
+public String getActionCommand() {
+return actionCommand;
+}
+private Action action;
+private PropertyChangeListener actionPropertyChangeListener;
+/**
+* Sets the <code>Action</code> for the <code>ActionEvent</code> source.
+* The new <code>Action</code> replaces any previously set
+* <code>Action</code> but does not affect <code>ActionListeners</code>
+* independently added with <code>addActionListener</code>.
+* If the <code>Action</code> is already a registered
+* <code>ActionListener</code> for the <code>ActionEvent</code> source,
+* it is not re-registered.
+* <p>
+* Setting the <code>Action</code> results in immediately changing
+* all the properties described in <a href="Action.html#buttonActions">
+* Swing Components Supporting <code>Action</code></a>.
+* Subsequently, the combobox's properties are automatically updated
+* as the <code>Action</code>'s properties change.
+* <p>
+* This method uses three other methods to set
+* and help track the <code>Action</code>'s property values.
+* It uses the <code>configurePropertiesFromAction</code> method
+* to immediately change the combobox's properties.
+* To track changes in the <code>Action</code>'s property values,
+* this method registers the <code>PropertyChangeListener</code>
+* returned by <code>createActionPropertyChangeListener</code>. The
+* default {@code PropertyChangeListener} invokes the
+* {@code actionPropertyChanged} method when a property in the
+* {@code Action} changes.
+*
+* @param a the <code>Action</code> for the <code>JComboBox</code>,
+*                  or <code>null</code>.
+* @since 1.3
+* @see Action
+* @see #getAction
+* @see #configurePropertiesFromAction
+* @see #createActionPropertyChangeListener
+* @see #actionPropertyChanged
+* @beaninfo
+*        bound: true
+*    attribute: visualUpdate true
+*  description: the Action instance connected with this ActionEvent source
+*/
+public void setAction(Action a) {
+Action oldValue = getAction();
+if (action==null || !action.equals(a)) {
+action = a;
+if (oldValue!=null) {
+removeActionListener(oldValue);
+oldValue.removePropertyChangeListener(actionPropertyChangeListener);
+actionPropertyChangeListener = null;
+}
+configurePropertiesFromAction(action);
+if (action!=null) {
+// Don't add if it is already a listener
+if (!isListener(ActionListener.class, action)) {
+addActionListener(action);
+}
+// Reverse linkage:
+actionPropertyChangeListener = createActionPropertyChangeListener(action);
+action.addPropertyChangeListener(actionPropertyChangeListener);
+}
+firePropertyChange("action", oldValue, action);
+}
+}
+private boolean isListener(Class c, ActionListener a) {
+boolean isListener = false;
+Object[] listeners = listenerList.getListenerList();
+for (int i = listeners.length-2; i>=0; i-=2) {
+if (listeners[i]==c && listeners[i+1]==a) {
+isListener=true;
+}
+}
+return isListener;
+}
+/**
+* Returns the currently set <code>Action</code> for this
+* <code>ActionEvent</code> source, or <code>null</code> if no
+* <code>Action</code> is set.
+*
+* @return the <code>Action</code> for this <code>ActionEvent</code>
+*          source; or <code>null</code>
+* @since 1.3
+* @see Action
+* @see #setAction
+*/
+public Action getAction() {
+return action;
+}
+/**
+* Sets the properties on this combobox to match those in the specified
+* <code>Action</code>.  Refer to <a href="Action.html#buttonActions">
+* Swing Components Supporting <code>Action</code></a> for more
+* details as to which properties this sets.
+*
+* @param a the <code>Action</code> from which to get the properties,
+*          or <code>null</code>
+* @since 1.3
+* @see Action
+* @see #setAction
+*/
+protected void configurePropertiesFromAction(Action a) {
+AbstractAction.setEnabledFromAction(this, a);
+AbstractAction.setToolTipTextFromAction(this, a);
+setActionCommandFromAction(a);
+}
+/**
+* Creates and returns a <code>PropertyChangeListener</code> that is
+* responsible for listening for changes from the specified
+* <code>Action</code> and updating the appropriate properties.
+* <p>
+* <b>Warning:</b> If you subclass this do not create an anonymous
+* inner class.  If you do the lifetime of the combobox will be tied to
+* that of the <code>Action</code>.
+*
+* @param a the combobox's action
+* @since 1.3
+* @see Action
+* @see #setAction
+*/
+protected PropertyChangeListener createActionPropertyChangeListener(Action a) {
+return new ComboBoxActionPropertyChangeListener(this, a);
+}
+/**
+* Updates the combobox's state in response to property changes in
+* associated action. This method is invoked from the
+* {@code PropertyChangeListener} returned from
+* {@code createActionPropertyChangeListener}. Subclasses do not normally
+* need to invoke this. Subclasses that support additional {@code Action}
+* properties should override this and
+* {@code configurePropertiesFromAction}.
+* <p>
+* Refer to the table at <a href="Action.html#buttonActions">
+* Swing Components Supporting <code>Action</code></a> for a list of
+* the properties this method sets.
+*
+* @param action the <code>Action</code> associated with this combobox
+* @param propertyName the name of the property that changed
+* @since 1.6
+* @see Action
+* @see #configurePropertiesFromAction
+*/
+protected void actionPropertyChanged(Action action, String propertyName) {
+if (propertyName == Action.ACTION_COMMAND_KEY) {
+setActionCommandFromAction(action);
+} else if (propertyName == "enabled") {
+AbstractAction.setEnabledFromAction(this, action);
+} else if (Action.SHORT_DESCRIPTION == propertyName) {
+AbstractAction.setToolTipTextFromAction(this, action);
+}
+}
+private void setActionCommandFromAction(Action a) {
+setActionCommand((a != null) ?
+(String)a.getValue(Action.ACTION_COMMAND_KEY) :
+null);
+}
+private static class ComboBoxActionPropertyChangeListener
+extends ActionPropertyChangeListener<JComboBox> {
+ComboBoxActionPropertyChangeListener(JComboBox b, Action a) {
+super(b, a);
+}
+protected void actionPropertyChanged(JComboBox cb,
+Action action,
+PropertyChangeEvent e) {
+if (AbstractAction.shouldReconfigure(e)) {
+cb.configurePropertiesFromAction(action);
+} else {
+cb.actionPropertyChanged(action, e.getPropertyName());
+}
+}
+}
+/**
+* Notifies all listeners that have registered interest for
+* notification on this event type.
+* @param e  the event of interest
+*
+* @see EventListenerList
+*/
+protected void fireItemStateChanged(ItemEvent 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 ) {
+if ( listeners[i]==ItemListener.class ) {
+// Lazily create the event:
+// if (changeEvent == null)
+// changeEvent = new ChangeEvent(this);
+((ItemListener)listeners[i+1]).itemStateChanged(e);
+}
+}
+}
+/**
+* Notifies all listeners that have registered interest for
+* notification on this event type.
+*
+* @see EventListenerList
+*/
+protected void fireActionEvent() {
+if (!firingActionEvent) {
+// Set flag to ensure that an infinite loop is not created
+firingActionEvent = true;
+ActionEvent e = null;
+// Guaranteed to return a non-null array
+Object[] listeners = listenerList.getListenerList();
+long mostRecentEventTime = EventQueue.getMostRecentEventTime();
+int modifiers = 0;
+AWTEvent currentEvent = EventQueue.getCurrentEvent();
+if (currentEvent instanceof InputEvent) {
+modifiers = ((InputEvent)currentEvent).getModifiers();
+} else if (currentEvent instanceof ActionEvent) {
+modifiers = ((ActionEvent)currentEvent).getModifiers();
+}
+// 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]==ActionListener.class ) {
+// Lazily create the event:
+if ( e == null )
+e = new ActionEvent(this,ActionEvent.ACTION_PERFORMED,
+getActionCommand(),
+mostRecentEventTime, modifiers);
+((ActionListener)listeners[i+1]).actionPerformed(e);
+}
+}
+firingActionEvent = false;
+}
+}
+/**
+* This protected method is implementation specific. Do not access directly
+* or override.
+*/
+protected void selectedItemChanged() {
+if (selectedItemReminder != null ) {
+fireItemStateChanged(new ItemEvent(this,ItemEvent.ITEM_STATE_CHANGED,
+selectedItemReminder,
+ItemEvent.DESELECTED));
+}
+// set the new selected item.
+selectedItemReminder = dataModel.getSelectedItem();
+if (selectedItemReminder != null ) {
+fireItemStateChanged(new ItemEvent(this,ItemEvent.ITEM_STATE_CHANGED,
+selectedItemReminder,
+ItemEvent.SELECTED));
+}
+}
+/**
+* Returns an array containing the selected item.
+* This method is implemented for compatibility with
+* <code>ItemSelectable</code>.
+*
+* @return an array of <code>Objects</code> containing one
+*          element -- the selected item
+*/
+public Object[] getSelectedObjects() {
+Object selectedObject = getSelectedItem();
+if ( selectedObject == null )
+return new Object[0];
+else {
+Object result[] = new Object[1];
+result[0] = selectedObject;
+return result;
+}
+}
+/**
+* This method is public as an implementation side effect.
+* do not call or override.
+*/
+public void actionPerformed(ActionEvent e) {
+Object newItem = getEditor().getItem();
+setPopupVisible(false);
+getModel().setSelectedItem(newItem);
+String oldCommand = getActionCommand();
+setActionCommand("comboBoxEdited");
+fireActionEvent();
+setActionCommand(oldCommand);
+}
+/**
+* This method is public as an implementation side effect.
+* do not call or override.
+*/
+public void contentsChanged(ListDataEvent e) {
+Object oldSelection = selectedItemReminder;
+Object newSelection = dataModel.getSelectedItem();
+if (oldSelection == null || !oldSelection.equals(newSelection)) {
+selectedItemChanged();
+if (!selectingItem) {
+fireActionEvent();
+}
+}
+}
+/**
+* This method is public as an implementation side effect.
+* do not call or override.
+*/
+public void intervalAdded(ListDataEvent e) {
+if (selectedItemReminder != dataModel.getSelectedItem()) {
+selectedItemChanged();
+}
+}
+/**
+* This method is public as an implementation side effect.
+* do not call or override.
+*/
+public void intervalRemoved(ListDataEvent e) {
+contentsChanged(e);
+}
+/**
+* Selects the list item that corresponds to the specified keyboard
+* character and returns true, if there is an item corresponding
+* to that character.  Otherwise, returns false.
+*
+* @param keyChar a char, typically this is a keyboard key
+*                  typed by the user
+*/
+public boolean selectWithKeyChar(char keyChar) {
+int index;
+if ( keySelectionManager == null )
+keySelectionManager = createDefaultKeySelectionManager();
+index = keySelectionManager.selectionForKey(keyChar,getModel());
+if ( index != -1 ) {
+setSelectedIndex(index);
+return true;
+}
+else
+return false;
+}
+/**
+* Enables the combo box so that items can be selected. When the
+* combo box is disabled, items cannot be selected and values
+* cannot be typed into its field (if it is editable).
+*
+* @param b a boolean value, where true enables the component and
+*          false disables it
+* @beaninfo
+*        bound: true
+*    preferred: true
+*  description: Whether the combo box is enabled.
+*/
+public void setEnabled(boolean b) {
+super.setEnabled(b);
+firePropertyChange( "enabled", !isEnabled(), isEnabled() );
+}
+/**
+* Initializes the editor with the specified item.
+*
+* @param anEditor the <code>ComboBoxEditor</code> that displays
+*                  the list item in the
+*                  combo box field and allows it to be edited
+* @param anItem   the object to display and edit in the field
+*/
+public void configureEditor(ComboBoxEditor anEditor, Object anItem) {
+anEditor.setItem(anItem);
+}
+/**
+* Handles <code>KeyEvent</code>s, looking for the Tab key.
+* If the Tab key is found, the popup window is closed.
+*
+* @param e  the <code>KeyEvent</code> containing the keyboard
+*          key that was pressed
+*/
+public void processKeyEvent(KeyEvent e) {
+if ( e.getKeyCode() == KeyEvent.VK_TAB ) {
+hidePopup();
+}
+super.processKeyEvent(e);
+}
+/**
+* Sets the object that translates a keyboard character into a list
+* selection. Typically, the first selection with a matching first
+* character becomes the selected item.
+*
+* @beaninfo
+*       expert: true
+*  description: The objects that changes the selection when a key is pressed.
+*/
+public void setKeySelectionManager(KeySelectionManager aManager) {
+keySelectionManager = aManager;
+}
+/**
+* Returns the list's key-selection manager.
+*
+* @return the <code>KeySelectionManager</code> currently in use
+*/
+public KeySelectionManager getKeySelectionManager() {
+return keySelectionManager;
+}
+/* Accessing the model */
+/**
+* Returns the number of items in the list.
+*
+* @return an integer equal to the number of items in the list
+*/
+public int getItemCount() {
+return dataModel.getSize();
+}
+/**
+* Returns the list item at the specified index.  If <code>index</code>
+* is out of range (less than zero or greater than or equal to size)
+* it will return <code>null</code>.
+*
+* @param index  an integer indicating the list position, where the first
+*               item starts at zero
+* @return the <code>Object</code> at that list position; or
+*                  <code>null</code> if out of range
+*/
+public Object getItemAt(int index) {
+return dataModel.getElementAt(index);
+}
+/**
+* Returns an instance of the default key-selection manager.
+*
+* @return the <code>KeySelectionManager</code> currently used by the list
+* @see #setKeySelectionManager
+*/
+protected KeySelectionManager createDefaultKeySelectionManager() {
+return new DefaultKeySelectionManager();
+}
+/**
+* The interface that defines a <code>KeySelectionManager</code>.
+* To qualify as a <code>KeySelectionManager</code>,
+* the class needs to implement the method
+* that identifies the list index given a character and the
+* combo box data model.
+*/
+public interface KeySelectionManager {
+/** Given <code>aKey</code> and the model, returns the row
+*  that should become selected. Return -1 if no match was
+*  found.
+*
+* @param  aKey  a char value, usually indicating a keyboard key that
+*               was pressed
+* @param aModel a ComboBoxModel -- the component's data model, containing
+*               the list of selectable items
+* @return an int equal to the selected row, where 0 is the
+*         first item and -1 is none.
+*/
+int selectionForKey(char aKey,ComboBoxModel aModel);
+}
+class DefaultKeySelectionManager implements KeySelectionManager, Serializable {
+public int selectionForKey(char aKey,ComboBoxModel aModel) {
+int i,c;
+int currentSelection = -1;
+Object selectedItem = aModel.getSelectedItem();
+String v;
+String pattern;
+if ( selectedItem != null ) {
+for ( i=0,c=aModel.getSize();i<c;i++ ) {
+if ( selectedItem == aModel.getElementAt(i) ) {
+currentSelection  =  i;
+break;
+}
+}
+}
+pattern = ("" + aKey).toLowerCase();
+aKey = pattern.charAt(0);
+for ( i = ++currentSelection, c = aModel.getSize() ; i < c ; i++ ) {
+Object elem = aModel.getElementAt(i);
+if (elem != null && elem.toString() != null) {
+v = elem.toString().toLowerCase();
+if ( v.length() > 0 && v.charAt(0) == aKey )
+return i;
+}
+}
+for ( i = 0 ; i < currentSelection ; i ++ ) {
+Object elem = aModel.getElementAt(i);
+if (elem != null && elem.toString() != null) {
+v = elem.toString().toLowerCase();
+if ( v.length() > 0 && v.charAt(0) == aKey )
+return i;
+}
+}
+return -1;
+}
+}
+/**
+* See <code>readObject</code> and <code>writeObject</code> in
+* <code>JComponent</code> for more
+* information about serialization in Swing.
+*/
+private void writeObject(ObjectOutputStream s) throws IOException {
+s.defaultWriteObject();
+if (getUIClassID().equals(uiClassID)) {
+byte count = JComponent.getWriteObjCounter(this);
+JComponent.setWriteObjCounter(this, --count);
+if (count == 0 && ui != null) {
+ui.installUI(this);
+}
+}
+}
+/**
+* Returns a string representation of this <code>JComboBox</code>.
+* This method is intended to be used only for debugging purposes,
+* and the content and format of the returned string may vary between
+* implementations. The returned string may be empty but may not
+* be <code>null</code>.
+*
+* @return  a string representation of this <code>JComboBox</code>
+*/
+protected String paramString() {
+String selectedItemReminderString = (selectedItemReminder != null ?
+selectedItemReminder.toString() :
+"");
+String isEditableString = (isEditable ? "true" : "false");
+String lightWeightPopupEnabledString = (lightWeightPopupEnabled ?
+"true" : "false");
+return super.paramString() +
+",isEditable=" + isEditableString +
+",lightWeightPopupEnabled=" + lightWeightPopupEnabledString +
+",maximumRowCount=" + maximumRowCount +
+",selectedItemReminder=" + selectedItemReminderString;
+}
+///////////////////
+// Accessibility support
+///////////////////
+/**
+* Gets the AccessibleContext associated with this JComboBox.
+* For combo boxes, the AccessibleContext takes the form of an
+* AccessibleJComboBox.
+* A new AccessibleJComboBox instance is created if necessary.
+*
+* @return an AccessibleJComboBox that serves as the
+*         AccessibleContext of this JComboBox
+*/
+public AccessibleContext getAccessibleContext() {
+if ( accessibleContext == null ) {
+accessibleContext = new AccessibleJComboBox();
+}
+return accessibleContext;
+}
+/**
+* This class implements accessibility support for the
+* <code>JComboBox</code> class.  It provides an implementation of the
+* Java Accessibility API appropriate to Combo Box user-interface elements.
+* <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}.
+*/
+protected class AccessibleJComboBox extends AccessibleJComponent
+implements AccessibleAction, AccessibleSelection {
+private JList popupList; // combo box popup list
+private Accessible previousSelectedAccessible = null;
+/**
+* Returns an AccessibleJComboBox instance
+* @since 1.4
+*/
+public AccessibleJComboBox() {
+// set the combo box editor's accessible name and description
+JComboBox.this.addPropertyChangeListener(new AccessibleJComboBoxPropertyChangeListener());
+setEditorNameAndDescription();
+// Get the popup list
+Accessible a = getUI().getAccessibleChild(JComboBox.this, 0);
+if (a instanceof javax.swing.plaf.basic.ComboPopup) {
+// Listen for changes to the popup menu selection.
+popupList = ((javax.swing.plaf.basic.ComboPopup)a).getList();
+popupList.addListSelectionListener(
+new AccessibleJComboBoxListSelectionListener());
+}
+// Listen for popup menu show/hide events
+JComboBox.this.addPopupMenuListener(
+new AccessibleJComboBoxPopupMenuListener());
+}
+/*
+* JComboBox PropertyChangeListener
+*/
+private class AccessibleJComboBoxPropertyChangeListener
+implements PropertyChangeListener {
+public void propertyChange(PropertyChangeEvent e) {
+if (e.getPropertyName() == "editor") {
+// set the combo box editor's accessible name
+// and description
+setEditorNameAndDescription();
+}
+}
+}
+/*
+* Sets the combo box editor's accessible name and descripton
+*/
+private void setEditorNameAndDescription() {
+ComboBoxEditor editor = JComboBox.this.getEditor();
+if (editor != null) {
+Component comp = editor.getEditorComponent();
+if (comp instanceof Accessible) {
+AccessibleContext ac = ((Accessible)comp).getAccessibleContext();
+if (ac != null) { // may be null
+ac.setAccessibleName(getAccessibleName());
+ac.setAccessibleDescription(getAccessibleDescription());
+}
+}
+}
+}
+/*
+* Listener for combo box popup menu
+* TIGER - 4669379 4894434
+*/
+private class AccessibleJComboBoxPopupMenuListener
+implements PopupMenuListener {
+/**
+*  This method is called before the popup menu becomes visible
+*/
+public void popupMenuWillBecomeVisible(PopupMenuEvent e) {
+// save the initial selection
+if (popupList == null) {
+return;
+}
+int selectedIndex = popupList.getSelectedIndex();
+if (selectedIndex < 0) {
+return;
+}
+previousSelectedAccessible =
+popupList.getAccessibleContext().getAccessibleChild(selectedIndex);
+}
+/**
+* This method is called before the popup menu becomes invisible
+* Note that a JPopupMenu can become invisible any time
+*/
+public void popupMenuWillBecomeInvisible(PopupMenuEvent e) {
+// ignore
+}
+/**
+* This method is called when the popup menu is canceled
+*/
+public void popupMenuCanceled(PopupMenuEvent e) {
+// ignore
+}
+}
+/*
+* Handles changes to the popup list selection.
+* TIGER - 4669379 4894434 4933143
+*/
+private class AccessibleJComboBoxListSelectionListener
+implements ListSelectionListener {
+public void valueChanged(ListSelectionEvent e) {
+if (popupList == null) {
+return;
+}
+// Get the selected popup list item.
+int selectedIndex = popupList.getSelectedIndex();
+if (selectedIndex < 0) {
+return;
+}
+Accessible selectedAccessible =
+popupList.getAccessibleContext().getAccessibleChild(selectedIndex);
+if (selectedAccessible == null) {
+return;
+}
+// Fire a FOCUSED lost PropertyChangeEvent for the
+// previously selected list item.
+PropertyChangeEvent pce = null;
+if (previousSelectedAccessible != null) {
+pce = new PropertyChangeEvent(previousSelectedAccessible,
+AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
+AccessibleState.FOCUSED, null);
+firePropertyChange(AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
+null, pce);
+}
+// Fire a FOCUSED gained PropertyChangeEvent for the
+// currently selected list item.
+pce = new PropertyChangeEvent(selectedAccessible,
+AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
+null, AccessibleState.FOCUSED);
+firePropertyChange(AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
+null, pce);
+// Fire the ACCESSIBLE_ACTIVE_DESCENDANT_PROPERTY event
+// for the combo box.
+firePropertyChange(AccessibleContext.ACCESSIBLE_ACTIVE_DESCENDANT_PROPERTY,
+previousSelectedAccessible, selectedAccessible);
+// Save the previous selection.
+previousSelectedAccessible = selectedAccessible;
+}
+}
+/**
+* Returns the number of accessible children in the object.  If all
+* of the children of this object implement Accessible, than this
+* method should return the number of children of this object.
+*
+* @return the number of accessible children in the object.
+*/
+public int getAccessibleChildrenCount() {
+// Always delegate to the UI if it exists
+if (ui != null) {
+return ui.getAccessibleChildrenCount(JComboBox.this);
+} else {
+return super.getAccessibleChildrenCount();
+}
+}
+/**
+* Returns the nth Accessible child of the object.
+* The child at index zero represents the popup.
+* If the combo box is editable, the child at index one
+* represents the editor.
+*
+* @param i zero-based index of child
+* @return the nth Accessible child of the object
+*/
+public Accessible getAccessibleChild(int i) {
+// Always delegate to the UI if it exists
+if (ui != null) {
+return ui.getAccessibleChild(JComboBox.this, i);
+} else {
+return super.getAccessibleChild(i);
+}
+}
+/**
+* Get the role of this object.
+*
+* @return an instance of AccessibleRole describing the role of the
+* object
+* @see AccessibleRole
+*/
+public AccessibleRole getAccessibleRole() {
+return AccessibleRole.COMBO_BOX;
+}
+/**
+* Gets the state set of this object.  The AccessibleStateSet of
+* an object is composed of a set of unique AccessibleStates.
+* A change in the AccessibleStateSet of an object will cause a
+* PropertyChangeEvent to be fired for the ACCESSIBLE_STATE_PROPERTY
+* property.
+*
+* @return an instance of AccessibleStateSet containing the
+* current state set of the object
+* @see AccessibleStateSet
+* @see AccessibleState
+* @see #addPropertyChangeListener
+*
+*/
+public AccessibleStateSet getAccessibleStateSet() {
+// TIGER - 4489748
+AccessibleStateSet ass = super.getAccessibleStateSet();
+if (ass == null) {
+ass = new AccessibleStateSet();
+}
+if (JComboBox.this.isPopupVisible()) {
+ass.add(AccessibleState.EXPANDED);
+} else {
+ass.add(AccessibleState.COLLAPSED);
+}
+return ass;
+}
+/**
+* Get the AccessibleAction associated with this object.  In the
+* implementation of the Java Accessibility API for this class,
+* return this object, which is responsible for implementing the
+* AccessibleAction interface on behalf of itself.
+*
+* @return this object
+*/
+public AccessibleAction getAccessibleAction() {
+return this;
+}
+/**
+* Return a description of the specified action of the object.
+*
+* @param i zero-based index of the actions
+*/
+public String getAccessibleActionDescription(int i) {
+if (i == 0) {
+return UIManager.getString("ComboBox.togglePopupText");
+}
+else {
+return null;
+}
+}
+/**
+* Returns the number of Actions available in this object.  The
+* default behavior of a combo box is to have one action.
+*
+* @return 1, the number of Actions in this object
+*/
+public int getAccessibleActionCount() {
+return 1;
+}
+/**
+* Perform the specified Action on the object
+*
+* @param i zero-based index of actions
+* @return true if the the action was performed; else false.
+*/
+public boolean doAccessibleAction(int i) {
+if (i == 0) {
+setPopupVisible(!isPopupVisible());
+return true;
+}
+else {
+return false;
+}
+}
+/**
+* Get the AccessibleSelection associated with this object.  In the
+* implementation of the Java Accessibility API for this class,
+* return this object, which is responsible for implementing the
+* AccessibleSelection interface on behalf of itself.
+*
+* @return this object
+*/
+public AccessibleSelection getAccessibleSelection() {
+return this;
+}
+/**
+* Returns the number of Accessible children currently selected.
+* If no children are selected, the return value will be 0.
+*
+* @return the number of items currently selected.
+* @since 1.3
+*/
+public int getAccessibleSelectionCount() {
+Object o = JComboBox.this.getSelectedItem();
+if (o != null) {
+return 1;
+} else {
+return 0;
+}
+}
+/**
+* Returns an Accessible representing the specified selected child
+* in the popup.  If there isn't a selection, or there are
+* fewer children selected than the integer passed in, the return
+* value will be null.
+* <p>Note that the index represents the i-th selected child, which
+* is different from the i-th child.
+*
+* @param i the zero-based index of selected children
+* @return the i-th selected child
+* @see #getAccessibleSelectionCount
+* @since 1.3
+*/
+public Accessible getAccessibleSelection(int i) {
+// Get the popup
+Accessible a =
+JComboBox.this.getUI().getAccessibleChild(JComboBox.this, 0);
+if (a != null &&
+a instanceof javax.swing.plaf.basic.ComboPopup) {
+// get the popup list
+JList list = ((javax.swing.plaf.basic.ComboPopup)a).getList();
+// return the i-th selection in the popup list
+AccessibleContext ac = list.getAccessibleContext();
+if (ac != null) {
+AccessibleSelection as = ac.getAccessibleSelection();
+if (as != null) {
+return as.getAccessibleSelection(i);
+}
+}
+}
+return null;
+}
+/**
+* Determines if the current child of this object is selected.
+*
+* @return true if the current child of this object is selected;
+*              else false
+* @param i the zero-based index of the child in this Accessible
+* object.
+* @see AccessibleContext#getAccessibleChild
+* @since 1.3
+*/
+public boolean isAccessibleChildSelected(int i) {
+return JComboBox.this.getSelectedIndex() == i;
+}
+/**
+* Adds the specified Accessible child of the object to the object's
+* selection.  If the object supports multiple selections,
+* the specified child is added to any existing selection, otherwise
+* it replaces any existing selection in the object.  If the
+* specified child is already selected, this method has no effect.
+*
+* @param i the zero-based index of the child
+* @see AccessibleContext#getAccessibleChild
+* @since 1.3
+*/
+public void addAccessibleSelection(int i) {
+// TIGER - 4856195
+clearAccessibleSelection();
+JComboBox.this.setSelectedIndex(i);
+}
+/**
+* Removes the specified child of the object from the object's
+* selection.  If the specified item isn't currently selected, this
+* method has no effect.
+*
+* @param i the zero-based index of the child
+* @see AccessibleContext#getAccessibleChild
+* @since 1.3
+*/
+public void removeAccessibleSelection(int i) {
+if (JComboBox.this.getSelectedIndex() == i) {
+clearAccessibleSelection();
+}
+}
+/**
+* Clears the selection in the object, so that no children in the
+* object are selected.
+* @since 1.3
+*/
+public void clearAccessibleSelection() {
+JComboBox.this.setSelectedIndex(-1);
+}
+/**
+* Causes every child of the object to be selected
+* if the object supports multiple selections.
+* @since 1.3
+*/
+public void selectAllAccessibleSelection() {
+// do nothing since multiple selection is not supported
+}
+//        public Accessible getAccessibleAt(Point p) {
+//            Accessible a = getAccessibleChild(1);
+//            if ( a != null ) {
+//                return a; // the editor
+//            }
+//            else {
+//                return getAccessibleChild(0); // the list
+//            }
+//        }
+private EditorAccessibleContext editorAccessibleContext = null;
+private class AccessibleEditor implements Accessible {
+public AccessibleContext getAccessibleContext() {
+if (editorAccessibleContext == null) {
+Component c = JComboBox.this.getEditor().getEditorComponent();
+if (c instanceof Accessible) {
+editorAccessibleContext =
+new EditorAccessibleContext((Accessible)c);
+}
+}
+return editorAccessibleContext;
+}
+}
+/*
+* Wrapper class for the AccessibleContext implemented by the
+* combo box editor.  Delegates all method calls except
+* getAccessibleIndexInParent to the editor.  The
+* getAccessibleIndexInParent method returns the selected
+* index in the combo box.
+*/
+private class EditorAccessibleContext extends AccessibleContext {
+private AccessibleContext ac;
+private EditorAccessibleContext() {
+}
+/*
+* @param a the AccessibleContext implemented by the
+* combo box editor
+*/
+EditorAccessibleContext(Accessible a) {
+this.ac = a.getAccessibleContext();
+}
+/**
+* Gets the accessibleName property of this object.  The accessibleName
+* property of an object is a localized String that designates the purpose
+* of the object.  For example, the accessibleName property of a label
+* or button might be the text of the label or button itself.  In the
+* case of an object that doesn't display its name, the accessibleName
+* should still be set.  For example, in the case of a text field used
+* to enter the name of a city, the accessibleName for the en_US locale
+* could be 'city.'
+*
+* @return the localized name of the object; null if this
+* object does not have a name
+*
+* @see #setAccessibleName
+*/
+public String getAccessibleName() {
+return ac.getAccessibleName();
+}
+/**
+* Sets the localized accessible name of this object.  Changing the
+* name will cause a PropertyChangeEvent to be fired for the
+* ACCESSIBLE_NAME_PROPERTY property.
+*
+* @param s the new localized name of the object.
+*
+* @see #getAccessibleName
+* @see #addPropertyChangeListener
+*
+* @beaninfo
+*    preferred:   true
+*    description: Sets the accessible name for the component.
+*/
+public void setAccessibleName(String s) {
+ac.setAccessibleName(s);
+}
+/**
+* Gets the accessibleDescription property of this object.  The
+* accessibleDescription property of this object is a short localized
+* phrase describing the purpose of the object.  For example, in the
+* case of a 'Cancel' button, the accessibleDescription could be
+* 'Ignore changes and close dialog box.'
+*
+* @return the localized description of the object; null if
+* this object does not have a description
+*
+* @see #setAccessibleDescription
+*/
+public String getAccessibleDescription() {
+return ac.getAccessibleDescription();
+}
+/**
+* Sets the accessible description of this object.  Changing the
+* name will cause a PropertyChangeEvent to be fired for the
+* ACCESSIBLE_DESCRIPTION_PROPERTY property.
+*
+* @param s the new localized description of the object
+*
+* @see #setAccessibleName
+* @see #addPropertyChangeListener
+*
+* @beaninfo
+*    preferred:   true
+*    description: Sets the accessible description for the component.
+*/
+public void setAccessibleDescription(String s) {
+ac.setAccessibleDescription(s);
+}
+/**
+* Gets the role of this object.  The role of the object is the generic
+* purpose or use of the class of this object.  For example, the role
+* of a push button is AccessibleRole.PUSH_BUTTON.  The roles in
+* AccessibleRole are provided so component developers can pick from
+* a set of predefined roles.  This enables assistive technologies to
+* provide a consistent interface to various tweaked subclasses of
+* components (e.g., use AccessibleRole.PUSH_BUTTON for all components
+* that act like a push button) as well as distinguish between sublasses
+* that behave differently (e.g., AccessibleRole.CHECK_BOX for check boxes
+* and AccessibleRole.RADIO_BUTTON for radio buttons).
+* <p>Note that the AccessibleRole class is also extensible, so
+* custom component developers can define their own AccessibleRole's
+* if the set of predefined roles is inadequate.
+*
+* @return an instance of AccessibleRole describing the role of the object
+* @see AccessibleRole
+*/
+public AccessibleRole getAccessibleRole() {
+return ac.getAccessibleRole();
+}
+/**
+* Gets the state set of this object.  The AccessibleStateSet of an object
+* is composed of a set of unique AccessibleStates.  A change in the
+* AccessibleStateSet of an object will cause a PropertyChangeEvent to
+* be fired for the ACCESSIBLE_STATE_PROPERTY property.
+*
+* @return an instance of AccessibleStateSet containing the
+* current state set of the object
+* @see AccessibleStateSet
+* @see AccessibleState
+* @see #addPropertyChangeListener
+*/
+public AccessibleStateSet getAccessibleStateSet() {
+return ac.getAccessibleStateSet();
+}
+/**
+* Gets the Accessible parent of this object.
+*
+* @return the Accessible parent of this object; null if this
+* object does not have an Accessible parent
+*/
+public Accessible getAccessibleParent() {
+return ac.getAccessibleParent();
+}
+/**
+* Sets the Accessible parent of this object.  This is meant to be used
+* only in the situations where the actual component's parent should
+* not be treated as the component's accessible parent and is a method
+* that should only be called by the parent of the accessible child.
+*
+* @param a - Accessible to be set as the parent
+*/
+public void setAccessibleParent(Accessible a) {
+ac.setAccessibleParent(a);
+}
+/**
+* Gets the 0-based index of this object in its accessible parent.
+*
+* @return the 0-based index of this object in its parent; -1 if this
+* object does not have an accessible parent.
+*
+* @see #getAccessibleParent
+* @see #getAccessibleChildrenCount
+* @see #getAccessibleChild
+*/
+public int getAccessibleIndexInParent() {
+return JComboBox.this.getSelectedIndex();
+}
+/**
+* Returns the number of accessible children of the object.
+*
+* @return the number of accessible children of the object.
+*/
+public int getAccessibleChildrenCount() {
+return ac.getAccessibleChildrenCount();
+}
+/**
+* Returns the specified Accessible child of the object.  The Accessible
+* children of an Accessible object are zero-based, so the first child
+* of an Accessible child is at index 0, the second child is at index 1,
+* and so on.
+*
+* @param i zero-based index of child
+* @return the Accessible child of the object
+* @see #getAccessibleChildrenCount
+*/
+public Accessible getAccessibleChild(int i) {
+return ac.getAccessibleChild(i);
+}
+/**
+* Gets the locale of the component. If the component does not have a
+* locale, then the locale of its parent is returned.
+*
+* @return this component's locale.  If this component does not have
+* a locale, the locale of its parent is returned.
+*
+* @exception IllegalComponentStateException
+* If the Component does not have its own locale and has not yet been
+* added to a containment hierarchy such that the locale can be
+* determined from the containing parent.
+*/
+public Locale getLocale() throws IllegalComponentStateException {
+return ac.getLocale();
+}
+/**
+* Adds a PropertyChangeListener to the listener list.
+* The listener is registered for all Accessible properties and will
+* be called when those properties change.
+*
+* @see #ACCESSIBLE_NAME_PROPERTY
+* @see #ACCESSIBLE_DESCRIPTION_PROPERTY
+* @see #ACCESSIBLE_STATE_PROPERTY
+* @see #ACCESSIBLE_VALUE_PROPERTY
+* @see #ACCESSIBLE_SELECTION_PROPERTY
+* @see #ACCESSIBLE_TEXT_PROPERTY
+* @see #ACCESSIBLE_VISIBLE_DATA_PROPERTY
+*
+* @param listener  The PropertyChangeListener to be added
+*/
+public void addPropertyChangeListener(PropertyChangeListener listener) {
+ac.addPropertyChangeListener(listener);
+}
+/**
+* Removes a PropertyChangeListener from the listener list.
+* This removes a PropertyChangeListener that was registered
+* for all properties.
+*
+* @param listener  The PropertyChangeListener to be removed
+*/
+public void removePropertyChangeListener(PropertyChangeListener listener) {
+ac.removePropertyChangeListener(listener);
+}
+/**
+* Gets the AccessibleAction associated with this object that supports
+* one or more actions.
+*
+* @return AccessibleAction if supported by object; else return null
+* @see AccessibleAction
+*/
+public AccessibleAction getAccessibleAction() {
+return ac.getAccessibleAction();
+}
+/**
+* Gets the AccessibleComponent associated with this object that has a
+* graphical representation.
+*
+* @return AccessibleComponent if supported by object; else return null
+* @see AccessibleComponent
+*/
+public AccessibleComponent getAccessibleComponent() {
+return ac.getAccessibleComponent();
+}
+/**
+* Gets the AccessibleSelection associated with this object which allows its
+* Accessible children to be selected.
+*
+* @return AccessibleSelection if supported by object; else return null
+* @see AccessibleSelection
+*/
+public AccessibleSelection getAccessibleSelection() {
+return ac.getAccessibleSelection();
+}
+/**
+* Gets the AccessibleText associated with this object presenting
+* text on the display.
+*
+* @return AccessibleText if supported by object; else return null
+* @see AccessibleText
+*/
+public AccessibleText getAccessibleText() {
+return ac.getAccessibleText();
+}
+/**
+* Gets the AccessibleEditableText associated with this object
+* presenting editable text on the display.
+*
+* @return AccessibleEditableText if supported by object; else return null
+* @see AccessibleEditableText
+*/
+public AccessibleEditableText getAccessibleEditableText() {
+return ac.getAccessibleEditableText();
+}
+/**
+* Gets the AccessibleValue associated with this object that supports a
+* Numerical value.
+*
+* @return AccessibleValue if supported by object; else return null
+* @see AccessibleValue
+*/
+public AccessibleValue getAccessibleValue() {
+return ac.getAccessibleValue();
+}
+/**
+* Gets the AccessibleIcons associated with an object that has
+* one or more associated icons
+*
+* @return an array of AccessibleIcon if supported by object;
+* otherwise return null
+* @see AccessibleIcon
+*/
+public AccessibleIcon [] getAccessibleIcon() {
+return ac.getAccessibleIcon();
+}
+/**
+* Gets the AccessibleRelationSet associated with an object
+*
+* @return an AccessibleRelationSet if supported by object;
+* otherwise return null
+* @see AccessibleRelationSet
+*/
+public AccessibleRelationSet getAccessibleRelationSet() {
+return ac.getAccessibleRelationSet();
+}
+/**
+* Gets the AccessibleTable associated with an object
+*
+* @return an AccessibleTable if supported by object;
+* otherwise return null
+* @see AccessibleTable
+*/
+public AccessibleTable getAccessibleTable() {
+return ac.getAccessibleTable();
+}
+/**
+* Support for reporting bound property changes.  If oldValue and
+* newValue are not equal and the PropertyChangeEvent listener list
+* is not empty, then fire a PropertyChange event to each listener.
+* In general, this is for use by the Accessible objects themselves
+* and should not be called by an application program.
+* @param propertyName  The programmatic name of the property that
+* was changed.
+* @param oldValue  The old value of the property.
+* @param newValue  The new value of the property.
+* @see java.beans.PropertyChangeSupport
+* @see #addPropertyChangeListener
+* @see #removePropertyChangeListener
+* @see #ACCESSIBLE_NAME_PROPERTY
+* @see #ACCESSIBLE_DESCRIPTION_PROPERTY
+* @see #ACCESSIBLE_STATE_PROPERTY
+* @see #ACCESSIBLE_VALUE_PROPERTY
+* @see #ACCESSIBLE_SELECTION_PROPERTY
+* @see #ACCESSIBLE_TEXT_PROPERTY
+* @see #ACCESSIBLE_VISIBLE_DATA_PROPERTY
+*/
+public void firePropertyChange(String propertyName,
+Object oldValue,
+Object newValue) {
+ac.firePropertyChange(propertyName, oldValue, newValue);
+}
+}
+} // innerclass AccessibleJComboBox
+}

changeset 2	90ce3da70b43
child 466	6acd5ec503a8