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/* ListSelectionModel.java --

   Copyright (C) 2002, 2006, Free Software Foundation, Inc.

This file is part of GNU Classpath.

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package javax.swing;

import javax.swing.event.ListSelectionEvent;

import javax.swing.event.ListSelectionListener;

/**

 * A model that tracks the selection status of a list of items.  Each item in

 * the list is identified by a zero-based index only, so the model can be used

 * to track the selection status of any type of list.  The model

 * supports three modes:

 * <ul>

 * <li><code>SINGLE_SELECTION</code> - only one item in the list may be

 *     selected;</li>

 * <li><code>SINGLE_INTERVAL_SELECTION</code> - only one interval in the list

 *     may be selected;</li>

 * <li><code>MULTIPLE_INTERVAL_SELECTION</code> - any combination of items in

 *     the list may be selected.</li>

 * </ul>

 * The model uses an event notification mechanism to notify listeners (see

 * {@link ListSelectionListener}) about updates to the selection model.

 * <p>

 * This model is used to track row selections in the {@link JList} component,

 * and row and column selections in the {@link JTable} component.

 */

public interface ListSelectionModel

{

  /**

   * A selection mode in which only one item can be selected.

   *

   * @see #setSelectionMode(int)

   */

  int SINGLE_SELECTION = 0;

  /**

   * A selection mode in which a single interval can be selected (an interval

   * is a range containing one or more contiguous items).

   *

   * @see #setSelectionMode(int)

   */

  int SINGLE_INTERVAL_SELECTION = 1;

  /**

   * A selection mode in which any combination of items can be selected.

   *

   * @see #setSelectionMode(int)

   */

  int MULTIPLE_INTERVAL_SELECTION = 2;

  /**

   * Sets the selection mode.

   * <p>

   * FIXME: The spec is silent about what happens to existing selections, for

   * example when changing from an interval selection to single selection.

   *

   * @param mode  one of {@link #SINGLE_SELECTION},

   *     {@link #SINGLE_INTERVAL_SELECTION} and

   *     {@link #MULTIPLE_INTERVAL_SELECTION}.

   *

   * @see #getSelectionMode()

   *

   * @throws IllegalArgumentException if <code>mode</code> is not one of the

   *     specified values.

   */

  void setSelectionMode(int mode);

  /**

   * Returns the selection mode, which is one of {@link #SINGLE_SELECTION},

   * {@link #SINGLE_INTERVAL_SELECTION} and

   * {@link #MULTIPLE_INTERVAL_SELECTION}.

   *

   * @return The selection mode.

   *

   * @see #setSelectionMode(int)

   */

  int getSelectionMode();

  /**

   * Clears the current selection from the model.  If the selection state

   * changes (that is, the existing selection is non-empty) a

   * {@link ListSelectionEvent} should be sent to all registered listeners.

   * <p>

   * FIXME: what happens to the anchor and lead selection indices (the spec

   * is silent about this)?  See:

   * <p>

   * http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4334792

   */

  void clearSelection();

  /**

   * Returns the lowest selected index, or <code>-1</code> if there is no

   * selection.

   *

   * @return The lowest selected index.

   *

   * @see #getMaxSelectionIndex()

   */

  int getMinSelectionIndex();

  /**

   * Returns the highest selected index, or <code>-1</code> if there is no

   * selection.

   *

   * @return The highest selected index.

   *

   * @see #getMinSelectionIndex()

   */

  int getMaxSelectionIndex();

  /**

   * Returns <code>true</code> if the specified item is selected, and

   * <code>false</code> otherwise.  Special note: if <code>index</code> is

   * negative, this method should return <code>false</code> (no exception

   * should be thrown).

   *

   * @param index  the item index (zero-based).

   *

   * @return <code>true</code> if the specified item is selected, and

   *     <code>false</code> otherwise.

   */

  boolean isSelectedIndex(int index);

  /**

   * Returns <code>true</code> if there is no selection, and <code>false</code>

   * otherwise.

   *

   * @return  <code>true</code> if there is no selection, and

   *     <code>false</code> otherwise.

   */

  boolean isSelectionEmpty();

  /**

   * Sets the selection interval to the specified range (note that

   * <code>anchor</code> can be less than, equal to, or greater than

   * <code>lead</code>).  If this results in the selection being changed,

   * a {@link ListSelectionEvent} is sent to all registered listeners.

   * <p>

   * If the selection mode is {@link #SINGLE_SELECTION}, only the

   * <code>lead</code> item is selected.

   *

   * @param anchor  the anchor index.

   * @param lead  the lead index.

   */

  void setSelectionInterval(int anchor, int lead);

  /**

   * Marks the items in the specified interval as selected.  The behaviour of

   * this method depends on the selection mode:

   * <ul>

   * <li><code>SINGLE_SELECTION</code> - only the <code>lead</code> item is

   *     selected;</li>

   * <li><code>SINGLE_INTERVAL_SELECTION</code> - the existing selection

   *     interval is replaced by the specified interval;</li>

   * <li><code>MULTIPLE_INTERVAL_SELECTION</code> - the specified interval is

   *     merged into the currently selected intervals.</li>

   * </ul>

   * Note that <code>anchor</code> can be less than, equal to, or greater than

   * <code>lead</code>.

   *

   * @param anchor  the index of the anchor item

   * @param lead  the index of the lead item.

   */

  void addSelectionInterval(int anchor, int lead);

  /**

   * Marks the items in the specified interval as not selected.  The behaviour

   * of this method depends on the selection mode:

   * <ul>

   * <li><code>SINGLE_SELECTION</code> - XXX;</li>

   * <li><code>SINGLE_INTERVAL_SELECTION</code> - XXX;</li>

   * <li><code>MULTIPLE_INTERVAL_SELECTION</code> - XXX.</li>

   * </ul>

   * Note that <code>anchor</code> can be less than, equal to, or greater than

   * <code>lead</code>.

   *

   * @param anchor  the index of the anchor item

   * @param lead  the index of the lead item.

   */

  void removeSelectionInterval(int anchor, int lead);

  /**

   * Inserts a new interval containing <code>length</code> items at the

   * specified <code>index</code> (the <code>before</code> flag indicates

   * whether the range is inserted before or after the existing item at

   * <code>index</code>).

   *

   * FIXME: What is the selection status of the new items? Bug 4870694.

   * FIXME: What event is generated?

   *

   * @param index  the index of the item.

   * @param length  the number of items in the interval to be inserted.

   * @param before  if <code>true</code>, the interval should be inserted

   *     before <code>index</code>, otherwise it is inserted after.

   *

   * @see #removeIndexInterval(int, int)

   */

  void insertIndexInterval(int index, int length, boolean before);

  /**

   * Removes the items in the specified range (inclusive) from the selection

   * model.  This method should be called when an interval is deleted from

   * the underlying list.

   *

   * FIXME: what happens to the lead and anchor indices if they are part of

   * the range that is removed?

   * FIXME: what event is generated

   *

   * @param index0  XXX

   * @param index1  XXX

   *

   * @see #insertIndexInterval(int, int, boolean)

   */

  void removeIndexInterval(int index0, int index1);

  /**

   * Returns the index of the anchor item.

   *

   * @return The index of the anchor item.

   *

   * @see #setAnchorSelectionIndex(int)

   */

  int getAnchorSelectionIndex();

  /**

   * Sets the index of the anchor item.

   *

   * @param index  the item index.

   *

   * @see #getAnchorSelectionIndex()

   */

  void setAnchorSelectionIndex(int index);

  /**

   * Returns the index of the lead item.

   *

   * @return The index of the lead item.

   *

   * @see #setLeadSelectionIndex(int)

   */

  int getLeadSelectionIndex();

  /**

   * Sets the index of the lead item.

   *

   * @param index  the item index.

   *

   * @see #getLeadSelectionIndex()

   */

  void setLeadSelectionIndex(int index);

  /**

   * Sets the flag that is passed to listeners for each change notification.

   * If a sequence of changes is made to the selection model, this flag should

   * be set to <code>true</code> at the start of the sequence, and

   * <code>false</code> for the last change - this gives listeners the option

   * to ignore interim changes if that is more efficient.

   *

   * @param valueIsAdjusting  the flag value.

   *

   * @see #getValueIsAdjusting()

   */

  void setValueIsAdjusting(boolean valueIsAdjusting);

  /**

   * Returns a flag that is passed to registered listeners when changes are

   * made to the model.  See the description for

   * {@link #setValueIsAdjusting(boolean)} for more information.

   *

   * @return The flag.

   */

  boolean getValueIsAdjusting();

  /**

   * Registers a listener with the model so that it receives notification

   * of changes to the model.

   *

   * @param listener  the listener (<code>null</code> ignored).

   *

   * @see #removeListSelectionListener(ListSelectionListener)

   */

  void addListSelectionListener(ListSelectionListener listener);

  /**

   * Deregisters a listener so that it no longer receives notification of

   * changes to the model.  If the specified listener is not registered with

   * the model, or is <code>null</code>, this method does nothing.

   *

   * @param listener  the listener (<code>null</code> ignored).

   *

   * @see #addListSelectionListener(ListSelectionListener)

   */

  void removeListSelectionListener(ListSelectionListener listener);

}