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authorAaron M. Renn <arenn@urbanophile.com>1999-07-25 03:26:37 +0000
committerAaron M. Renn <arenn@urbanophile.com>1999-07-25 03:26:37 +0000
commit294cb7bc26d4aa1b08c5e9845dabfb7507535b8a (patch)
treead0d422060d26487c25a4f1359a2c1d538c5a46c /java/awt/List.java
parentcd3269058d8dac0555265fe6587d8a4fa90b21ac (diff)
downloadclasspath-294cb7bc26d4aa1b08c5e9845dabfb7507535b8a.tar.gz
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+/*************************************************************************
+/* List.java -- A listbox widget
+/*
+/* Copyright (c) 1999 Free Software Foundation, Inc.
+/* Written by Aaron M. Renn (arenn@urbanophile.com)
+/*
+/* This library is free software; you can redistribute it and/or modify
+/* it under the terms of the GNU Library General Public License as published
+/* by the Free Software Foundation, either version 2 of the License, or
+/* (at your option) any later verion.
+/*
+/* This library is distributed in the hope that it will be useful, but
+/* WITHOUT ANY WARRANTY; without even the implied warranty of
+/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+/* GNU Library General Public License for more details.
+/*
+/* You should have received a copy of the GNU Library General Public License
+/* along with this library; if not, write to the Free Software Foundation
+/* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307 USA
+/*************************************************************************/
+
+package java.awt;
+
+import java.io.Serializable;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.awt.event.ItemEvent;
+import java.awt.event.ItemListener;
+import java.awt.peer.ListPeer;
+import java.util.Vector;
+
+/**
+ * Class that implements a listbox widget
+ *
+ * @author Aaron M. Renn (arenn@urbanophile.com)
+ */
+public class List extends Component implements ItemSelectable, Serializable
+{
+
+/*
+ * Static Variables
+ */
+
+// Serialization constant
+private static final long serialVersionUID = -3304312411574666869L;
+
+/*************************************************************************/
+
+/*
+ * Instance Variables
+ */
+
+// FIXME: Need read/writeObject
+
+/**
+ * @serial The items in the list.
+ */
+private Vector items = new Vector();
+
+/**
+ * @serial Indicates whether or not multiple items can be selected
+ * simultaneously.
+ */
+private boolean multipleMode;
+
+/**
+ * @serial The number of rows in the list. This is set on creation
+ * only and cannot be modified.
+ */
+private int rows;
+
+/**
+ * @serial An array of the item indices that are selected.
+ */
+private int[] selected;
+
+/**
+ * @serial An index value used by <code>makeVisible()</code> and
+ * <code>getVisibleIndex</code>.
+ */
+private int visibleIndex;
+
+// The list of ItemListeners for this object.
+private ItemListener item_listeners;
+
+// The list of ActionListeners for this object.
+private ActionListener action_listeners;
+
+/*************************************************************************/
+
+/*
+ * Constructors
+ */
+
+/**
+ * Initializes a new instance of <code>List</code> with no visible lines
+ * and multi-select disabled.
+ */
+public
+List()
+{
+ this(0, false);
+}
+
+/*************************************************************************/
+
+/**
+ * Initializes a new instance of <code>List</code> with the specified
+ * number of visible lines and multi-select disabled.
+ *
+ * @param lines The number of visible lines in the list.
+ */
+public
+List(int rows)
+{
+ this(rows, false);
+}
+
+/*************************************************************************/
+
+/**
+ * Initializes a new instance of <code>List</code> with the specified
+ * number of lines and the specified multi-select setting.
+ *
+ * @param lines The number of visible lines in the list.
+ * @param multipleMode <code>true</code> if multiple lines can be selected
+ * simultaneously, <code>false</code> otherwise.
+ */
+public
+List(int rows, boolean multipleMode)
+{
+ this.rows = rows;
+ this.multipleMode = multipleMode;
+}
+
+/*************************************************************************/
+
+/*
+ * Instance Variables
+ */
+
+/**
+ * Returns the number of items in this list.
+ *
+ * @return The number of items in this list.
+ */
+public int
+getItemCount()
+{
+ return(items.size());
+}
+
+/*************************************************************************/
+
+/**
+ * Returns the number of items in this list.
+ *
+ * @return The number of items in this list.
+ *
+ * @deprecated This method is deprecated in favor of
+ * <code>getItemCount()</code>
+ */
+public int
+countItems()
+{
+ return(getItemCount());
+}
+
+/*************************************************************************/
+
+/**
+ * Returns the complete list of items.
+ *
+ * @return The complete list of items in the list.
+ */
+public synchronized String[]
+getItems()
+{
+ String[] l_items = new String[getItemCount()];
+
+ items.copyInto(l_items);
+ return(l_items);
+}
+
+/*************************************************************************/
+
+/**
+ * Returns the item at the specified index.
+ *
+ * @param index The index of the item to retrieve.
+ *
+ * @exception IndexOutOfBoundsException If the index value is not valid.
+ */
+public String
+getItem(int index)
+{
+ return((String)items.elementAt(index));
+}
+
+/*************************************************************************/
+
+/**
+ * Returns the number of visible rows in the list.
+ *
+ * @return The number of visible rows in the list.
+ */
+public int
+getRows()
+{
+ return(rows);
+}
+
+/*************************************************************************/
+
+/**
+ * Tests whether or not multi-select mode is enabled.
+ *
+ * @return <code>true</code> if multi-select mode is enabled,
+ * <code>false</code> otherwise.
+ */
+public boolean
+isMultipleMode()
+{
+ return(multipleMode);
+}
+
+/*************************************************************************/
+
+/**
+ * Tests whether or not multi-select mode is enabled.
+ *
+ * @return <code>true</code> if multi-select mode is enabled,
+ * <code>false</code> otherwise.
+ *
+ * @deprecated This method is deprecated in favor of
+ * <code>isMultipleMode()</code>.
+ */
+public boolean
+allowsMultipleSelections()
+{
+ return(multipleMode);
+}
+
+/*************************************************************************/
+
+/**
+ * This method enables or disables multiple selection mode for this
+ * list.
+ *
+ * @param multipleMode <code>true</code> to enable multiple mode,
+ * <code>false</code> otherwise.
+ */
+public void
+setMultipleMode(boolean multipleMode)
+{
+ this.multipleMode = multipleMode;
+
+ ListPeer lp = (ListPeer)getPeer();
+ if (lp != null)
+ lp.setMultipleMode(multipleMode);
+}
+
+/*************************************************************************/
+
+/**
+ * This method enables or disables multiple selection mode for this
+ * list.
+ *
+ * @param multipleMode <code>true</code> to enable multiple mode,
+ * <code>false</code> otherwise.
+ */
+public void
+setMultipleSelections(boolean multipleMode)
+{
+ setMultipleMode(multipleMode);
+}
+
+/*************************************************************************/
+
+/**
+ * Returns the minimum size of this component.
+ *
+ * @return The minimum size of this component.
+ */
+public Dimension
+getMinimumSize()
+{
+ return(getMinimumSize(rows));
+}
+
+/*************************************************************************/
+
+/**
+ * Returns the minimum size of this component.
+ *
+ * @return The minimum size of this component.
+ *
+ * @deprecated This method is deprecated in favor of
+ * <code>getMinimumSize</code>.
+ */
+public Dimension
+minimumSize()
+{
+ return(getMinimumSize(rows));
+}
+
+/*************************************************************************/
+
+/**
+ * Returns the minimum size of this component assuming it had the specified
+ * number of rows.
+ *
+ * @param rows The number of rows to size for.
+ *
+ * @return The minimum size of this component.
+ */
+public Dimension
+getMinimumSize(int rows)
+{
+ ListPeer lp = (ListPeer)getPeer();
+ if (lp != null)
+ return(lp.minimumSize(rows));
+ else
+ return(new Dimension(0,0));
+}
+
+/*************************************************************************/
+
+/**
+ * Returns the minimum size of this component assuming it had the specified
+ * number of rows.
+ *
+ * @param rows The number of rows to size for.
+ *
+ * @return The minimum size of this component.
+ *
+ * @deprecated This method is deprecated in favor of
+ * <code>getMinimumSize(int)</code>>
+ */
+public Dimension
+minimumSize(int rows)
+{
+ return(getMinimumSize(rows));
+}
+
+/*************************************************************************/
+
+/**
+ * Returns the preferred size of this component.
+ *
+ * @return The preferred size of this component.
+ */
+public Dimension
+getPreferredSize()
+{
+ return(getPreferredSize(rows));
+}
+
+/*************************************************************************/
+
+/**
+ * Returns the preferred size of this component.
+ *
+ * @return The preferred size of this component.
+ *
+ * @deprecated This method is deprecated in favor of
+ * <code>getPreferredSize</code>.
+ */
+public Dimension
+preferredSize()
+{
+ return(getPreferredSize(rows));
+}
+
+/*************************************************************************/
+
+/**
+ * Returns the preferred size of this component assuming it had the specified
+ * number of rows.
+ *
+ * @param rows The number of rows to size for.
+ *
+ * @return The preferred size of this component.
+ */
+public Dimension
+getPreferredSize(int rows)
+{
+ ListPeer lp = (ListPeer)getPeer();
+ if (lp != null)
+ return(lp.preferredSize(rows));
+ else
+ return(new Dimension(0,0));
+}
+
+/*************************************************************************/
+
+/**
+ * Returns the preferred size of this component assuming it had the specified
+ * number of rows.
+ *
+ * @param rows The number of rows to size for.
+ *
+ * @return The preferred size of this component.
+ *
+ * @deprecated This method is deprecated in favor of
+ * <code>getPreferredSize(int)</code>>
+ */
+public Dimension
+preferredSize(int rows)
+{
+ return(getPreferredSize(rows));
+}
+
+/*************************************************************************/
+
+/**
+ * This method adds the specified item to the end of the list.
+ *
+ * @param item The item to add to the list.
+ */
+public void
+add(String item)
+{
+ addItem(item, -1);
+}
+
+/*************************************************************************/
+
+/**
+ * This method adds the specified item to the end of the list.
+ *
+ * @param item The item to add to the list.
+ */
+public void
+addItem(String item)
+{
+ addItem(item, -1);
+}
+
+/*************************************************************************/
+
+/**
+ * Adds the specified item to the specified location in the list.
+ * If the desired index is -1 or greater than the number of rows
+ * in the list, then the item is added to the end.
+ *
+ * @param item The item to add to the list.
+ * @param index The location in the list to add the item, or -1 to add
+ * to the end.
+ */
+public void
+add(String item, int index)
+{
+ addItem(item, index);
+}
+
+/*************************************************************************/
+
+/**
+ * Adds the specified item to the specified location in the list.
+ * If the desired index is -1 or greater than the number of rows
+ * in the list, then the item is added to the end.
+ *
+ * @param item The item to add to the list.
+ * @param index The location in the list to add the item, or -1 to add
+ * to the end.
+ */
+public void
+addItem(String item, int index)
+{
+ if ((index == -1) || (index >= items.size()))
+ items.addElement(item);
+ else
+ items.insertElementAt(item, index);
+
+ ListPeer lp = (ListPeer)getPeer();
+ if (lp != null)
+ lp.add(item, index);
+}
+
+/*************************************************************************/
+
+/**
+ * Deletes the item at the specified index.
+ *
+ * @param index The index of the item to delete.
+ *
+ * @exception IllegalArgumentException If the index is not valid
+ */
+public void
+delItem(int index) throws IllegalArgumentException
+{
+ delItems(index, index);
+}
+
+/*************************************************************************/
+
+/**
+ * Deletes the item at the specified index.
+ *
+ * @param index The index of the item to delete.
+ *
+ * @exception IllegalArgumentException If the index is not valid
+ */
+public void
+remove(int index) throws IllegalArgumentException
+{
+ delItems(index, index);
+}
+
+/*************************************************************************/
+
+/**
+ * Deletes all items in the specified index range.
+ *
+ * @param start The beginning index of the range to delete.
+ * @param end The ending index of the range to delete.
+ *
+ * @exception IllegalArgumentException If the indexes are not valid
+ *
+ * @deprecated This method is deprecated for some unknown reason.
+ */
+public synchronized void
+delItems(int start, int end) throws IllegalArgumentException
+{
+ if ((start < 0) || (start >= items.size()))
+ throw new IllegalArgumentException("Bad list start index value: " + start);
+
+ if ((start < 0) || (start >= items.size()))
+ throw new IllegalArgumentException("Bad list start index value: " + start);
+
+ if (start > end)
+ throw new IllegalArgumentException("Start is greater than end!");
+
+ for (int i = start; i <= end; i++)
+ items.removeElementAt(i);
+
+ ListPeer lp = (ListPeer)getPeer();
+ if (lp != null)
+ lp.delItems(start, end);
+}
+
+/*************************************************************************/
+
+/**
+ * Deletes the first occurrence of the specified item from the list.
+ *
+ * @param item The item to delete.
+ *
+ * @exception IllegalArgumentException If the specified item does not exist.
+ */
+public synchronized void
+remove(String item) throws IllegalArgumentException
+{
+ int index = items.indexOf(item);
+ if (index == -1)
+ throw new IllegalArgumentException("List element to delete not found");
+
+ delItem(index);
+}
+
+/*************************************************************************/
+
+/**
+ * Deletes all of the items from the list.
+ */
+public synchronized void
+removeAll()
+{
+ items = new Vector();
+
+ ListPeer lp = (ListPeer)getPeer();
+ if (lp != null)
+ lp.removeAll();
+}
+
+/*************************************************************************/
+
+/**
+ * Deletes all of the items from the list.
+ *
+ * @deprecated This method is deprecated in favor of <code>removeAll()</code>.
+ */
+public void
+clear()
+{
+ removeAll();
+}
+
+/*************************************************************************/
+
+/**
+ * Replaces the item at the specified index with the specified item.
+ *
+ * @param item The new item value.
+ * @param index The index of the item to replace.
+ *
+ * @exception IllegalArgumentException If the index is not valid.
+ */
+public synchronized void
+replaceItem(String item, int index) throws IllegalArgumentException
+{
+ delItem(index);
+ addItem(item, index);
+}
+
+/*************************************************************************/
+
+/**
+ * Returns the index of the currently selected item. -1 will be returned
+ * if there are no selected rows or if there are multiple selected rows.
+ *
+ * @return The index of the selected row.
+ */
+public synchronized int
+getSelectedIndex()
+{
+ ListPeer lp = (ListPeer)getPeer();
+ if (lp == null)
+ return(-1);
+
+ int[] idxs = lp.getSelectedIndexes();
+ if (idxs == null)
+ return(-1);
+ if (idxs.length > 1)
+ return(-1);
+
+ return(idxs[0]);
+}
+
+/*************************************************************************/
+
+/**
+ * Returns an array containing the indexes of the rows that are
+ * currently selected.
+ *
+ * @return A list of indexes of selected rows.
+ */
+public synchronized int[]
+getSelectedIndexes()
+{
+ ListPeer lp = (ListPeer)getPeer();
+ if (lp == null)
+ return(new int[0]);
+
+ return(lp.getSelectedIndexes());
+}
+
+/*************************************************************************/
+
+/**
+ * Returns the item that is currently selected, or <code>null</code> if there
+ * is no item selected. FIXME: What happens if multiple items selected?
+ *
+ * @return The selected item, or <code>null</code> if there is no
+ * selected item.
+ */
+public synchronized String
+getSelectedItem()
+{
+ int index = getSelectedIndex();
+ if (index == -1)
+ return(null);
+
+ return((String)items.elementAt(index));
+}
+
+/*************************************************************************/
+
+/**
+ * Returns the list of items that are currently selected in this list.
+ *
+ * @return The list of currently selected items.
+ */
+public synchronized String[]
+getSelectedItems()
+{
+ int[] indexes = getSelectedIndexes();
+ if (indexes == null)
+ return(new String[0]);
+
+ String[] retvals = new String[indexes.length];
+ if (retvals.length > 0)
+ for (int i = 0 ; i < retvals.length; i++)
+ retvals[i] = (String)items.elementAt(indexes[i]);
+
+ return(retvals);
+}
+
+/*************************************************************************/
+
+/**
+ * Returns the list of items that are currently selected in this list as
+ * an array of type <code>Object[]</code> instead of <code>String[]</code>.
+ *
+ * @return The list of currently selected items.
+ */
+public synchronized Object[]
+getSelectedObjects()
+{
+ int[] indexes = getSelectedIndexes();
+ if (indexes == null)
+ return(new Object[0]);
+
+ Object[] retvals = new Object[indexes.length];
+ if (retvals.length > 0)
+ for (int i = 0 ; i < retvals.length; i++)
+ retvals[i] = items.elementAt(indexes[i]);
+
+ return(retvals);
+}
+
+/*************************************************************************/
+
+/**
+ * Tests whether or not the specified index is selected.
+ *
+ * @param index The index to test.
+ *
+ * @return <code>true</code> if the index is selected, <code>false</code>
+ * otherwise.
+ */
+public boolean
+isIndexSelected(int index)
+{
+ int[] indexes = getSelectedIndexes();
+ if (indexes.length == 0)
+ return(false);
+
+ for (int i = 0; i < indexes.length; i++)
+ if (indexes[i] == index)
+ return(true);
+
+ return(false);
+}
+
+/*************************************************************************/
+
+/**
+ * Tests whether or not the specified index is selected.
+ *
+ * @param index The index to test.
+ *
+ * @return <code>true</code> if the index is selected, <code>false</code>
+ * otherwise.
+ *
+ * @deprecated This method is deprecated in favor of
+ * <code>isIndexSelected(int)</code>.
+ */
+public boolean
+isSelected(int index)
+{
+ return(isIndexSelected(index));
+}
+
+/*************************************************************************/
+
+/**
+ * This method ensures that the item at the specified index is visible.
+ *
+ * @exception IllegalArgumentException If the specified index is out of
+ * range.
+ */
+public synchronized void
+makeVisible(int index) throws IllegalArgumentException
+{
+ if ((index < 0) || (index >= items.size()))
+ throw new IllegalArgumentException("Bad list index: " + index);
+
+ visibleIndex = index;
+
+ ListPeer lp = (ListPeer)getPeer();
+ if (lp != null)
+ lp.makeVisible(index);
+}
+
+/*************************************************************************/
+
+/**
+ * Returns the index of the last item that was made visible via the
+ * <code>makeVisible()</code> method.
+ *
+ * @return The index of the last item made visible via the
+ * <code>makeVisible()</code> method.
+ */
+public int
+getVisibleIndex()
+{
+ return(visibleIndex);
+}
+
+/*************************************************************************/
+
+/**
+ * Makes the item at the specified index selected.
+ *
+ * @param index The index of the item to select.
+ */
+public synchronized void
+select(int index)
+{
+ ListPeer lp = (ListPeer)getPeer();
+ if (lp != null)
+ lp.select(index);
+}
+
+/*************************************************************************/
+
+/**
+ * Makes the item at the specified index not selected.
+ *
+ * @param index The index of the item to unselect.
+ */
+public synchronized void
+deselect(int index)
+{
+ ListPeer lp = (ListPeer)getPeer();
+ if (lp != null)
+ lp.deselect(index);
+}
+
+/*************************************************************************/
+
+/**
+ * Notifies this object to create its native peer.
+ */
+public void
+addNotify()
+{
+ setPeer(getToolkit().createList(this));
+}
+
+/*************************************************************************/
+
+/**
+ * Notifies this object to destroy its native peer.
+ */
+public void
+removeNotify()
+{
+ super.removeNotify();
+}
+
+/*************************************************************************/
+
+/**
+ * Adds the specified <code>ActionListener</code> to the list of
+ * registered listeners for this object.
+ *
+ * @param listener The listener to add.
+ */
+public synchronized void
+addActionListener(ActionListener listener)
+{
+ action_listeners = AWTEventMulticaster.add(action_listeners, listener);
+}
+
+/*************************************************************************/
+
+/**
+ * Removes the specified <code>ActionListener</code> from the list of
+ * registers listeners for this object.
+ *
+ * @param listener The listener to remove.
+ */
+public synchronized void
+removeActionListener(ActionListener listener)
+{
+ action_listeners = AWTEventMulticaster.remove(action_listeners, listener);
+}
+
+/*************************************************************************/
+
+/**
+ * Adds the specified <code>ItemListener</code> to the list of
+ * registered listeners for this object.
+ *
+ * @param listener The listener to add.
+ */
+public synchronized void
+addItemListener(ItemListener listener)
+{
+ item_listeners = AWTEventMulticaster.add(item_listeners, listener);
+}
+
+/*************************************************************************/
+
+/**
+ * Removes the specified <code>ItemListener</code> from the list of
+ * registers listeners for this object.
+ *
+ * @param listener The listener to remove.
+ */
+public synchronized void
+removeItemListener(ItemListener listener)
+{
+ item_listeners = AWTEventMulticaster.remove(item_listeners, listener);
+}
+
+/*************************************************************************/
+
+/**
+ * Processes the specified event for this object. If the event is an
+ * instance of <code>ActionEvent</code> then the
+ * <code>processActionEvent()</code> method is called. Similarly, if the
+ * even is an instance of <code>ItemEvent</code> then the
+ * <code>processItemEvent()</code> method is called. Otherwise the
+ * superclass method is called to process this event.
+ *
+ * @param event The event to process.
+ */
+protected void
+processEvent(AWTEvent event)
+{
+ if (event instanceof ActionEvent)
+ processActionEvent((ActionEvent)event);
+ if (event instanceof ItemEvent)
+ processItemEvent((ItemEvent)event);
+
+ super.processEvent(event);
+}
+
+/*************************************************************************/
+
+/**
+ * This method processes the specified event by dispatching it to any
+ * registered listeners. Note that this method will only get called if
+ * action events are enabled. This will happen automatically if any
+ * listeners are added, or it can be done "manually" by calling
+ * the <code>enableEvents()</code> method.
+ *
+ * @param event The event to process.
+ */
+protected void
+processActionEvent(ActionEvent event)
+{
+ if (action_listeners != null)
+ action_listeners.actionPerformed(event);
+}
+
+/*************************************************************************/
+
+/**
+ * This method processes the specified event by dispatching it to any
+ * registered listeners. Note that this method will only get called if
+ * item events are enabled. This will happen automatically if any
+ * listeners are added, or it can be done "manually" by calling
+ * the <code>enableEvents()</code> method.
+ *
+ * @param event The event to process.
+ */
+protected void
+processItemEvent(ItemEvent event)
+{
+ if (item_listeners != null)
+ item_listeners.itemStateChanged(event);
+}
+
+/*************************************************************************/
+
+/**
+ * Returns a debugging string for this object.
+ *
+ * @return A debugging string for this object.
+ */
+protected String
+paramString()
+{
+ return(getClass().getName());
+}
+
+} // class List
+