/* ListSelectionModel.java -- Copyright (C) 2002, 2006, Free Software Foundation, Inc. This file is part of GNU Classpath. GNU Classpath is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. GNU Classpath 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 for more details. You should have received a copy of the GNU General Public License along with GNU Classpath; see the file COPYING. If not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. Linking this library statically or dynamically with other modules is making a combined work based on this library. Thus, the terms and conditions of the GNU General Public License cover the whole combination. As a special exception, the copyright holders of this library give you permission to link this library with independent modules to produce an executable, regardless of the license terms of these independent modules, and to copy and distribute the resulting executable under terms of your choice, provided that you also meet, for each linked independent module, the terms and conditions of the license of that module. An independent module is a module which is not derived from or based on this library. If you modify this library, you may extend this exception to your version of the library, but you are not obligated to do so. If you do not wish to do so, delete this exception statement from your version. */ 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: * * The model uses an event notification mechanism to notify listeners (see * {@link ListSelectionListener}) about updates to the selection model. *

* 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. *

* 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 mode 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. *

* FIXME: what happens to the anchor and lead selection indices (the spec * is silent about this)? See: *

* http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4334792 */ void clearSelection(); /** * Returns the lowest selected index, or -1 if there is no * selection. * * @return The lowest selected index. * * @see #getMaxSelectionIndex() */ int getMinSelectionIndex(); /** * Returns the highest selected index, or -1 if there is no * selection. * * @return The highest selected index. * * @see #getMinSelectionIndex() */ int getMaxSelectionIndex(); /** * Returns true if the specified item is selected, and * false otherwise. Special note: if index is * negative, this method should return false (no exception * should be thrown). * * @param index the item index (zero-based). * * @return true if the specified item is selected, and * false otherwise. */ boolean isSelectedIndex(int index); /** * Returns true if there is no selection, and false * otherwise. * * @return true if there is no selection, and * false otherwise. */ boolean isSelectionEmpty(); /** * Sets the selection interval to the specified range (note that * anchor can be less than, equal to, or greater than * lead). If this results in the selection being changed, * a {@link ListSelectionEvent} is sent to all registered listeners. *

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

* Note that anchor can be less than, equal to, or greater than * lead. * * @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: * * Note that anchor can be less than, equal to, or greater than * lead. * * @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 length items at the * specified index (the before flag indicates * whether the range is inserted before or after the existing item at * index). * * 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 true, the interval should be inserted * before index, 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 true at the start of the sequence, and * false 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 (null 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 null, this method does nothing. * * @param listener the listener (null ignored). * * @see #addListSelectionListener(ListSelectionListener) */ void removeListSelectionListener(ListSelectionListener listener); }