- /*
- * @(#)List.java 1.72 01/11/29
- *
- * Copyright 2002 Sun Microsystems, Inc. All rights reserved.
- * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
- */
- package java.awt;
-
- import java.util.Vector;
- import java.awt.peer.ListPeer;
- import java.awt.event.*;
- import java.io.ObjectOutputStream;
- import java.io.ObjectInputStream;
- import java.io.IOException;
-
-
- /**
- * The <code>List</code> component presents the user with a
- * scrolling list of text items. The list can be set up so that
- * the user can choose either one item or multiple items.
- * <p>
- * For example, the code . . .
- * <p>
- * <hr><blockquote><pre>
- * List lst = new List(4, false);
- * lst.add("Mercury");
- * lst.add("Venus");
- * lst.add("Earth");
- * lst.add("JavaSoft");
- * lst.add("Mars");
- * lst.add("Jupiter");
- * lst.add("Saturn");
- * lst.add("Uranus");
- * lst.add("Neptune");
- * lst.add("Pluto");
- * cnt.add(lst);
- * </pre></blockquote><hr>
- * <p>
- * where <code>cnt</code> is a container, produces the following
- * scrolling list:
- * <p>
- * <img src="doc-files/List-1.gif"
- * ALIGN=center HSPACE=10 VSPACE=7>
- * <p>
- * Clicking on an item that isn't selected selects it. Clicking on
- * an item that is already selected deselects it. In the preceding
- * example, only one item from the scrolling list can be selected
- * at a time, since the second argument when creating the new scrolling
- * list is <code>false</code>. Selecting an item causes any other
- * selected item to be automatically deselected.
- * <p>
- * Beginning with Java 1.1, the Abstract Window Toolkit
- * sends the <code>List</code> object all mouse, keyboard, and focus events
- * that occur over it. (The old AWT event model is being maintained
- * only for backwards compatibility, and its use is discouraged.)
- * <p>
- * When an item is selected or deselected, AWT sends an instance
- * of <code>ItemEvent</code> to the list.
- * When the user double-clicks on an item in a scrolling list,
- * AWT sends an instance of <code>ActionEvent</code> to the
- * list following the item event. AWT also generates an action event
- * when the user presses the return key while an item in the
- * list is selected.
- * <p>
- * If an application wants to perform some action based on an item
- * in this list being selected or activated, it should implement
- * <code>ItemListener</code> or <code>ActionListener</code>
- * as appropriate and register the new listener to receive
- * events from this list.
- * <p>
- * For multiple-selection scrolling lists, it is considered a better
- * user interface to use an external gesture (such as clicking on a
- * button) to trigger the action.
- * @version 1.72, 11/29/01
- * @author Sami Shaio
- * @see java.awt.event.ItemEvent
- * @see java.awt.event.ItemListener
- * @see java.awt.event.ActionEvent
- * @see java.awt.event.ActionListener
- * @since JDK1.0
- */
- public class List extends Component implements ItemSelectable {
- /**
- * A vector created to contain items which will become
- * part of the List Component.
- *
- * @serial
- * @see addItem()
- * @see getItem()
- */
- Vector items = new Vector();
-
- /**
- * This field will represent the number of rows in the
- * List Component. It is specified only once, and
- * that is when the list component is actually
- * created. It will never change.
- *
- * @serial
- * @see getRows()
- */
- int rows = 0;
-
- /**
- * <code>multipleMode</code> is a variable that will
- * be set to <code>true</code> if a list component is to be set to
- * multiple selection mode, that is where the user can
- * select more than one item in a list at one time.
- * <code>multipleMode</code> will be set to false if the
- * list component is set to single selection, that is where
- * the user can only select one item on the list at any
- * one time.
- *
- * @serial
- * @see isMultipleMode()
- * @see setMultipleMode()
- */
- boolean multipleMode = false;
-
- /**
- * <code>selected</code> is an array that will contain
- * the indices of items that have been selected.
- *
- * @serial
- * @see getSelectedIndexes()
- * @see getSelectedIndex()
- */
- int selected[] = new int[0];
-
- /**
- * This variable contains the value that will be used
- * when trying to make a particular list item visible.
- *
- * @serial
- * @see makeVisible()
- */
- int visibleIndex = -1;
-
- transient ActionListener actionListener;
- transient ItemListener itemListener;
-
- private static final String base = "list";
- private static int nameCounter = 0;
-
- /*
- * JDK 1.1 serialVersionUID
- */
- private static final long serialVersionUID = -3304312411574666869L;
-
- /**
- * Creates a new scrolling list.
- * By default, there are four visible lines and multiple selections are
- * not allowed.
- */
- public List() {
- this(0, false);
- }
-
- /**
- * Creates a new scrolling list initialized with the specified
- * number of visible lines. By default, multiple selections are
- * not allowed.
- * @param rows the number of items to show.
- * @since JDK1.1
- */
- public List(int rows) {
- this(rows, false);
- }
-
- /**
- * The default number of visible rows is 4. A list with
- * zero rows is unusable and unsightly.
- */
- final static int DEFAULT_VISIBLE_ROWS = 4;
-
- /**
- * Creates a new scrolling list initialized to display the specified
- * number of rows. If the value of <code>multipleMode</code> is
- * <code>true</code>, then the user can select multiple items from
- * the list. If it is <code>false</code>, only one item at a time
- * can be selected.
- * @param rows the number of items to show.
- * @param multipleMode if <code>true</code>,
- * then multiple selections are allowed;
- * otherwise, only one item can be selected at a time.
- */
- public List(int rows, boolean multipleMode) {
- this.rows = (rows != 0) ? rows : DEFAULT_VISIBLE_ROWS;
- this.multipleMode = multipleMode;
- }
-
- /**
- * Construct a name for this component. Called by getName() when the
- * name is null.
- */
- String constructComponentName() {
- synchronized (getClass()) {
- return base + nameCounter++;
- }
- }
-
- /**
- * Creates the peer for the list. The peer allows us to modify the
- * list's appearance without changing its functionality.
- */
- public void addNotify() {
- synchronized (getTreeLock()) {
- if (peer == null)
- peer = getToolkit().createList(this);
- super.addNotify();
- visibleIndex = -1;
- }
- }
-
- /**
- * Removes the peer for this list. The peer allows us to modify the
- * list's appearance without changing its functionality.
- */
- public void removeNotify() {
- synchronized (getTreeLock()) {
- ListPeer peer = (ListPeer)this.peer;
- if (peer != null) {
- selected = peer.getSelectedIndexes();
- }
- super.removeNotify();
- }
- }
-
- /**
- * Gets the number of items in the list.
- * @return the number of items in the list.
- * @see java.awt.List#getItem
- * @since JDK1.1
- */
- public int getItemCount() {
- return countItems();
- }
-
- /**
- * @deprecated As of JDK version 1.1,
- * replaced by <code>getItemCount()</code>.
- */
- public int countItems() {
- return items.size();
- }
-
- /**
- * Gets the item associated with the specified index.
- * @return an item that is associated with
- * the specified index.
- * @param index the position of the item.
- * @see java.awt.List#getItemCount
- */
- public String getItem(int index) {
- return getItemImpl(index);
- }
-
- // NOTE: This method may be called by privileged threads.
- // We implement this functionality in a package-private method
- // to insure that it cannot be overridden by client subclasses.
- // DO NOT INVOKE CLIENT CODE ON THIS THREAD!
- final String getItemImpl(int index) {
- return (String)items.elementAt(index);
- }
-
- /**
- * Gets the items in the list.
- * @return a string array containing items of the list.
- * @see java.awt.List#select
- * @see java.awt.List#deselect
- * @see java.awt.List#isIndexSelected
- * @since JDK1.1
- */
- public synchronized String[] getItems() {
- String itemCopies[] = new String[items.size()];
- items.copyInto(itemCopies);
- return itemCopies;
- }
-
- /**
- * Adds the specified item to the end of scrolling list.
- * @param item the item to be added.
- * @since JDK1.1
- */
- public void add(String item) {
- addItem(item);
- }
-
- /**
- * @deprecated replaced by <code>add(String)</code>.
- */
- public void addItem(String item) {
- addItem(item, -1);
- }
-
- /**
- * Adds the specified item to the the scrolling list
- * at the position indicated by the index. The index is
- * zero-based. If the value of the index is less than zero,
- * or if the value of the index is greater than or equal to
- * the number of items in the list, then the item is added
- * to the end of the list.
- * @param item the item to be added.
- * If this parameter is null then the item is
- * treated as an empty string, <code>""</code>.
- * @param index the position at which to add the item.
- * @since JDK1.1
- */
- public void add(String item, int index) {
- addItem(item, index);
- }
-
- /**
- * @deprecated replaced by <code>add(String, int)</code>.
- */
- public synchronized void addItem(String item, int index) {
- if (index < -1 || index >= items.size()) {
- index = -1;
- }
-
- if (item == null) {
- item = "";
- }
-
- if (index == -1) {
- items.addElement(item);
- } else {
- items.insertElementAt(item, index);
- }
-
- ListPeer peer = (ListPeer)this.peer;
- if (peer != null) {
- peer.addItem(item, index);
- }
- }
-
- /**
- * Replaces the item at the specified index in the scrolling list
- * with the new string.
- * @param newValue a new string to replace an existing item.
- * @param index the position of the item to replace.
- */
- public synchronized void replaceItem(String newValue, int index) {
- remove(index);
- add(newValue, index);
- }
-
- /**
- * Removes all items from this list.
- * @see #remove
- * @see #delItems
- * @since JDK1.1
- */
- public void removeAll() {
- clear();
- }
-
- /**
- * @deprecated As of JDK version 1.1,
- * replaced by <code>removeAll()</code>.
- */
- public synchronized void clear() {
- ListPeer peer = (ListPeer)this.peer;
- if (peer != null) {
- peer.clear();
- }
- items = new Vector();
- selected = new int[0];
- }
-
- /**
- * Removes the first occurrence of an item from the list.
- * @param item the item to remove from the list.
- * @exception IllegalArgumentException
- * if the item doesn't exist in the list.
- * @since JDK1.1
- */
- public synchronized void remove(String item) {
- int index = items.indexOf(item);
- if (index < 0) {
- throw new IllegalArgumentException("item " + item +
- " not found in list");
- } else {
- remove(index);
- }
- }
-
- /**
- * Remove the item at the specified position
- * from this scrolling list.
- * @param position the index of the item to delete.
- * @see java.awt.List#add(String, int)
- * @since JDK1.1
- * @exception ArrayIndexOutOfBoundsException
- * if the <code>position</code> is less than 0 or
- * greater than <code>getItemCount()-1</code>
- */
- public void remove(int position) {
- delItem(position);
- }
-
- /**
- * @deprecated replaced by <code>remove(String)</code>
- * and <code>remove(int)</code>.
- */
- public void delItem(int position) {
- delItems(position, position);
- }
-
- /**
- * Gets the index of the selected item on the list,
- * @return the index of the selected item, or
- * <code>-1</code> if no item is selected,
- * or if more that one item is selected.
- * @see java.awt.List#select
- * @see java.awt.List#deselect
- * @see java.awt.List#isIndexSelected
- */
- public synchronized int getSelectedIndex() {
- int sel[] = getSelectedIndexes();
- return (sel.length == 1) ? sel[0] : -1;
- }
-
- /**
- * Gets the selected indexes on the list.
- * @return an array of the selected indexes
- * of this scrolling list.
- * @see java.awt.List#select
- * @see java.awt.List#deselect
- * @see java.awt.List#isIndexSelected
- */
- public synchronized int[] getSelectedIndexes() {
- ListPeer peer = (ListPeer)this.peer;
- if (peer != null) {
- selected = ((ListPeer)peer).getSelectedIndexes();
- }
- return selected;
- }
-
- /**
- * Get the selected item on this scrolling list.
- * @return the selected item on the list,
- * or null if no item is selected.
- * @see java.awt.List#select
- * @see java.awt.List#deselect
- * @see java.awt.List#isIndexSelected
- */
- public synchronized String getSelectedItem() {
- int index = getSelectedIndex();
- return (index < 0) ? null : getItem(index);
- }
-
- /**
- * Get the selected items on this scrolling list.
- * @return an array of the selected items
- * on this scrolling list.
- * @see java.awt.List#select
- * @see java.awt.List#deselect
- * @see java.awt.List#isIndexSelected
- */
- public synchronized String[] getSelectedItems() {
- int sel[] = getSelectedIndexes();
- String str[] = new String[sel.length];
- for (int i = 0 ; i < sel.length ; i++) {
- str[i] = getItem(sel[i]);
- }
- return str;
- }
-
- /**
- * Returns the selected items on the list in an array of Objects.
- * @see ItemSelectable
- */
- public Object[] getSelectedObjects() {
- return getSelectedItems();
- }
-
- /**
- * Selects the item at the specified index in the scrolling list.
- * @param index the position of the item to select.
- * @see java.awt.List#getSelectedItem
- * @see java.awt.List#deselect
- * @see java.awt.List#isIndexSelected
- */
- public void select(int index) {
- // Bug #4059614: select can't be synchronized while calling the peer,
- // because it is called from the Window Thread. It is sufficient to
- // synchronize the code that manipulates 'selected' except for the
- // case where the peer changes. To handle this case, we simply
- // repeat the selection process.
-
- ListPeer peer;
- do {
- peer = (ListPeer)this.peer;
- if (peer != null) {
- peer.select(index);
- return;
- }
-
- synchronized(this)
- {
- boolean alreadySelected = false;
-
- for (int i = 0 ; i < selected.length ; i++) {
- if (selected[i] == index) {
- alreadySelected = true;
- break;
- }
- }
-
- if (!alreadySelected) {
- if (!multipleMode) {
- selected = new int[1];
- selected[0] = index;
- } else {
- int newsel[] = new int[selected.length + 1];
- System.arraycopy(selected, 0, newsel, 0,
- selected.length);
- newsel[selected.length] = index;
- selected = newsel;
- }
- }
- }
- } while (peer != this.peer);
- }
-
- /**
- * Deselects the item at the specified index.
- * <p>
- * If the item at the specified index is not selected, or if the
- * index is out of range, then the operation is ignored.
- * @param index the position of the item to deselect.
- * @see java.awt.List#select
- * @see java.awt.List#getSelectedItem
- * @see java.awt.List#isIndexSelected
- */
- public synchronized void deselect(int index) {
- ListPeer peer = (ListPeer)this.peer;
- if (peer != null) {
- peer.deselect(index);
- }
-
- for (int i = 0 ; i < selected.length ; i++) {
- if (selected[i] == index) {
- int newsel[] = new int[selected.length - 1];
- System.arraycopy(selected, 0, newsel, 0, i);
- System.arraycopy(selected, i+1, newsel, i, selected.length - (i+1));
- selected = newsel;
- return;
- }
- }
- }
-
- /**
- * Determines if the specified item in this scrolling list is
- * selected.
- * @param index the item to be checked.
- * @return <code>true</code> if the specified item has been
- * selected; <code>false</code> otherwise.
- * @see java.awt.List#select
- * @see java.awt.List#deselect
- * @since JDK1.1
- */
- public boolean isIndexSelected(int index) {
- return isSelected(index);
- }
-
- /**
- * @deprecated As of JDK version 1.1,
- * replaced by <code>isIndexSelected(int)</code>.
- */
- public boolean isSelected(int index) {
- int sel[] = getSelectedIndexes();
- for (int i = 0 ; i < sel.length ; i++) {
- if (sel[i] == index) {
- return true;
- }
- }
- return false;
- }
-
- /**
- * Get the number of visible lines in this list.
- * @return the number of visible lines in this scrolling list.
- */
- public int getRows() {
- return rows;
- }
-
- /**
- * Determines whether this list allows multiple selections.
- * @return <code>true</code> if this list allows multiple
- * selections; otherwise, <code>false</code>.
- * @see java.awt.List#setMultipleMode
- * @since JDK1.1
- */
- public boolean isMultipleMode() {
- return allowsMultipleSelections();
- }
-
- /**
- * @deprecated As of JDK version 1.1,
- * replaced by <code>isMultipleMode()</code>.
- */
- public boolean allowsMultipleSelections() {
- return multipleMode;
- }
-
- /**
- * Sets the flag that determines whether this list
- * allows multiple selections.
- * @param b if <code>true</code> then multiple selections
- * are allowed; otherwise, only one item from
- * the list can be selected at once.
- * @see java.awt.List#isMultipleMode
- * @since JDK1.1
- */
- public void setMultipleMode(boolean b) {
- setMultipleSelections(b);
- }
-
- /**
- * @deprecated As of JDK version 1.1,
- * replaced by <code>setMultipleMode(boolean)</code>.
- */
- public synchronized void setMultipleSelections(boolean b) {
- if (b != multipleMode) {
- multipleMode = b;
- ListPeer peer = (ListPeer)this.peer;
- if (peer != null) {
- peer.setMultipleSelections(b);
- }
- }
- }
-
- /**
- * Gets the index of the item that was last made visible by
- * the method <code>makeVisible</code>.
- * @return the index of the item that was last made visible.
- * @see java.awt.List#makeVisible
- */
- public int getVisibleIndex() {
- return visibleIndex;
- }
-
- /**
- * Makes the item at the specified index visible.
- * @param index the position of the item.
- * @see java.awt.List#getVisibleIndex
- */
- public synchronized void makeVisible(int index) {
- visibleIndex = index;
- ListPeer peer = (ListPeer)this.peer;
- if (peer != null) {
- peer.makeVisible(index);
- }
- }
-
- /**
- * Gets the preferred dimensions for a list with the specified
- * number of rows.
- * @param rows number of rows in the list.
- * @return the preferred dimensions for displaying this scrolling list
- * given that the specified number of rows must be visible.
- * @see java.awt.Component#getPreferredSize
- * @since JDK1.1
- */
- public Dimension getPreferredSize(int rows) {
- return preferredSize(rows);
- }
-
- /**
- * @deprecated As of JDK version 1.1,
- * replaced by <code>getPreferredSize(int)</code>.
- */
- public Dimension preferredSize(int rows) {
- synchronized (getTreeLock()) {
- ListPeer peer = (ListPeer)this.peer;
- return (peer != null) ?
- peer.preferredSize(rows) :
- super.preferredSize();
- }
- }
-
- /**
- * Gets the preferred size of this scrolling list.
- * @return the preferred dimensions for displaying this scrolling list.
- * @see java.awt.Component#getPreferredSize
- * @since JDK1.1
- */
- public Dimension getPreferredSize() {
- return preferredSize();
- }
-
- /**
- * @deprecated As of JDK version 1.1,
- * replaced by <code>getPreferredSize()</code>.
- */
- public Dimension preferredSize() {
- synchronized (getTreeLock()) {
- return (rows > 0) ?
- preferredSize(rows) :
- super.preferredSize();
- }
- }
-
- /**
- * Gets the minumum dimensions for a list with the specified
- * number of rows.
- * @param rows number of rows in the list.
- * @return the minimum dimensions for displaying this scrolling list
- * given that the specified number of rows must be visible.
- * @see java.awt.Component#getMinimumSize
- * @since JDK1.1
- */
- public Dimension getMinimumSize(int rows) {
- return minimumSize(rows);
- }
-
- /**
- * @deprecated As of JDK version 1.1,
- * replaced by <code>getMinimumSize(int)</code>.
- */
- public Dimension minimumSize(int rows) {
- synchronized (getTreeLock()) {
- ListPeer peer = (ListPeer)this.peer;
- return (peer != null) ?
- peer.minimumSize(rows) :
- super.minimumSize();
- }
- }
-
- /**
- * Determines the minimum size of this scrolling list.
- * @return the minimum dimensions needed
- * to display this scrolling list.
- * @see java.awt.Component#getMinimumSize()
- * @since JDK1.1
- */
- public Dimension getMinimumSize() {
- return minimumSize();
- }
-
- /**
- * @deprecated As of JDK version 1.1,
- * replaced by <code>getMinimumSize()</code>.
- */
- public Dimension minimumSize() {
- synchronized (getTreeLock()) {
- return (rows > 0) ? minimumSize(rows) : super.minimumSize();
- }
- }
-
- /**
- * Adds the specified item listener to receive item events from
- * this list.
- * If l is null, no exception is thrown and no action is performed.
- *
- * @param l the item listener.
- * @see java.awt.event.ItemEvent
- * @see java.awt.event.ItemListener
- * @see java.awt.List#removeItemListener
- * @since JDK1.1
- */
- public synchronized void addItemListener(ItemListener l) {
- if (l == null) {
- return;
- }
- itemListener = AWTEventMulticaster.add(itemListener, l);
- newEventsOnly = true;
- }
-
- /**
- * Removes the specified item listener so that it no longer
- * receives item events from this list.
- * If l is null, no exception is thrown and no action is performed.
- *
- * @param l the item listener.
- * @see java.awt.event.ItemEvent
- * @see java.awt.event.ItemListener
- * @see java.awt.List#addItemListener
- * @since JDK1.1
- */
- public synchronized void removeItemListener(ItemListener l) {
- if (l == null) {
- return;
- }
- itemListener = AWTEventMulticaster.remove(itemListener, l);
- }
-
- /**
- * Adds the specified action listener to receive action events from
- * this list. Action events occur when a user double-clicks
- * on a list item.
- * If l is null, no exception is thrown and no action is performed.
- *
- * @param l the action listener.
- * @see java.awt.event.ActionEvent
- * @see java.awt.event.ActionListener
- * @see java.awt.List#removeActionListener
- * @since JDK1.1
- */
- public synchronized void addActionListener(ActionListener l) {
- if (l == null) {
- return;
- }
- actionListener = AWTEventMulticaster.add(actionListener, l);
- newEventsOnly = true;
- }
-
- /**
- * Removes the specified action listener so that it no longer
- * receives action events from this list. Action events
- * occur when a user double-clicks on a list item.
- * If l is null, no exception is thrown and no action is performed.
- *
- * @param l the action listener.
- * @see java.awt.event.ActionEvent
- * @see java.awt.event.ActionListener
- * @see java.awt.List#addActionListener
- * @since JDK1.1
- */
- public synchronized void removeActionListener(ActionListener l) {
- if (l == null) {
- return;
- }
- actionListener = AWTEventMulticaster.remove(actionListener, l);
- }
-
- // REMIND: remove when filtering is done at lower level
- boolean eventEnabled(AWTEvent e) {
- switch(e.id) {
- case ActionEvent.ACTION_PERFORMED:
- if ((eventMask & AWTEvent.ACTION_EVENT_MASK) != 0 ||
- actionListener != null) {
- return true;
- }
- return false;
- case ItemEvent.ITEM_STATE_CHANGED:
- if ((eventMask & AWTEvent.ITEM_EVENT_MASK) != 0 ||
- itemListener != null) {
- return true;
- }
- return false;
- default:
- break;
- }
- return super.eventEnabled(e);
- }
-
- /**
- * Processes events on this scrolling list. If an event is
- * an instance of <code>ItemEvent</code>, it invokes the
- * <code>processItemEvent</code> method. Else, if the
- * event is an instance of <code>ActionEvent</code>,
- * it invokes <code>processActionEvent</code>.
- * If the event is not an item event or an action event,
- * it invokes <code>processEvent</code> on the superclass.
- * @param e the event.
- * @see java.awt.event.ActionEvent
- * @see java.awt.event.ItemEvent
- * @see java.awt.List#processActionEvent
- * @see java.awt.List#processItemEvent
- * @since JDK1.1
- */
- protected void processEvent(AWTEvent e) {
- if (e instanceof ItemEvent) {
- processItemEvent((ItemEvent)e);
- return;
- } else if (e instanceof ActionEvent) {
- processActionEvent((ActionEvent)e);
- return;
- }
- super.processEvent(e);
- }
-
- /**
- * Processes item events occurring on this list by
- * dispatching them to any registered
- * <code>ItemListener</code> objects.
- * <p>
- * This method is not called unless item events are
- * enabled for this component. Item events are enabled
- * when one of the following occurs:
- * <p><ul>
- * <li>An <code>ItemListener</code> object is registered
- * via <code>addItemListener</code>.
- * <li>Item events are enabled via <code>enableEvents</code>.
- * </ul>
- * @param e the item event.
- * @see java.awt.event.ItemEvent
- * @see java.awt.event.ItemListener
- * @see java.awt.List#addItemListener
- * @see java.awt.Component#enableEvents
- * @since JDK1.1
- */
- protected void processItemEvent(ItemEvent e) {
- if (itemListener != null) {
- itemListener.itemStateChanged(e);
- }
- }
-
- /**
- * Processes action events occurring on this component
- * by dispatching them to any registered
- * <code>ActionListener</code> objects.
- * <p>
- * This method is not called unless action events are
- * enabled for this component. Action events are enabled
- * when one of the following occurs:
- * <p><ul>
- * <li>An <code>ActionListener</code> object is registered
- * via <code>addActionListener</code>.
- * <li>Action events are enabled via <code>enableEvents</code>.
- * </ul>
- * @param e the action event.
- * @see java.awt.event.ActionEvent
- * @see java.awt.event.ActionListener
- * @see java.awt.List#addActionListener
- * @see java.awt.Component#enableEvents
- * @since JDK1.1
- */
- protected void processActionEvent(ActionEvent e) {
- if (actionListener != null) {
- actionListener.actionPerformed(e);
- }
- }
-
- /**
- * Returns the parameter string representing the state of this
- * scrolling list. This string is useful for debugging.
- * @return the parameter string of this scrolling list.
- */
- protected String paramString() {
- return super.paramString() + ",selected=" + getSelectedItem();
- }
-
- /**
- * @deprecated As of JDK version 1.1,
- * Not for public use in the future.
- * This method is expected to be retained only as a package
- * private method.
- */
- public synchronized void delItems(int start, int end) {
- for (int i = end; i >= start; i--) {
- items.removeElementAt(i);
- }
- ListPeer peer = (ListPeer)this.peer;
- if (peer != null) {
- peer.delItems(start, end);
- }
- }
-
- /*
- * Serialization support. Since the value of the selected
- * field isn't neccessarily up to date we sync it up with the
- * peer before serializing.
- */
-
- /**
- * The List Components Serialized Data Version.
- *
- * @serial
- */
- private int listSerializedDataVersion = 1;
-
- /**
- * Writes default serializable fields to stream. Writes
- * a list of serializable ItemListener(s) as optional data.
- * The non-serializable ItemListner(s) are detected and
- * no attempt is made to serialize them.
- *
- * @serialData Null terminated sequence of 0 or more pairs.
- * The pair consists of a String and Object.
- * The String indicates the type of object and
- * is one of the following :
- * itemListenerK indicating and ItemListener object.
- *
- * @see AWTEventMulticaster.save(ObjectOutputStream, String, EventListener)
- * @see java.awt.Component.itemListenerK
- */
- private void writeObject(ObjectOutputStream s)
- throws IOException
- {
- synchronized (this) {
- ListPeer peer = (ListPeer)this.peer;
- if (peer != null) {
- selected = peer.getSelectedIndexes();
- }
- }
- s.defaultWriteObject();
-
- AWTEventMulticaster.save(s, itemListenerK, itemListener);
- AWTEventMulticaster.save(s, actionListenerK, actionListener);
- s.writeObject(null);
- }
-
- /**
- * Read the ObjectInputStream and if it isnt null
- * add a listener to receive item events fired
- * by the List.
- * Unrecognised keys or values will be Ignored.
- * @see removeActionListener()
- * @see addActionListener()
- */
- private void readObject(ObjectInputStream s)
- throws ClassNotFoundException, IOException
- {
- s.defaultReadObject();
-
- Object keyOrNull;
- while(null != (keyOrNull = s.readObject())) {
- String key = ((String)keyOrNull).intern();
-
- if (itemListenerK == key)
- addItemListener((ItemListener)(s.readObject()));
-
- else if (actionListenerK == key)
- addActionListener((ActionListener)(s.readObject()));
-
- else // skip value for unrecognized key
- s.readObject();
- }
- }
-
-
- }