/* TableColumnModel.java --
   Copyright (C) 2002, 2004, 2005, 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
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02110-1301 USA.

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permission to link this library with independent modules to produce an
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package javax.swing.table;

import java.util.Enumeration;

import javax.swing.JTable;
import javax.swing.ListSelectionModel;
import javax.swing.event.ChangeEvent;
import javax.swing.event.TableColumnModelEvent;
import javax.swing.event.TableColumnModelListener;

/**
 * The interface used by {@link JTable} to access the columns in the table
 * view.
 * 
 * @author Andrew Selkirk
 */
public interface TableColumnModel
{
  /**
   * Adds a column to the model.
   * 
   * @param column  the new column (<code>null</code> not permitted).
   * 
   * @throws IllegalArgumentException if <code>column</code> is 
   *         <code>null</code>.
   */
  void addColumn(TableColumn column);

  /**
   * Removes a column from the model.  If <code>column</code> is not defined
   * in the model, this method does nothing.
   * 
   * @param column TableColumn
   */
  void removeColumn(TableColumn column);

  /**
   * Moves a column.
   * 
   * @param columnIndex Index of column to move
   * @param newIndex New index of column
   */
  void moveColumn(int columnIndex, int newIndex);

  /**
   * Sets the column margin and sends a {@link ChangeEvent} to all registered
   * {@link TableColumnModelListener}s registered with the model.
   * 
   * @param margin  the column margin.
   * 
   * @see #getColumnMargin()
   */
  void setColumnMargin(int margin);

  /**
   * Returns the number of columns in the model.
   * 
   * @return The column count.
   */
  int getColumnCount();

  /**
   * Returns an enumeration of the columns in the model.
   * 
   * @return An enumeration of the columns in the model.
   */
  Enumeration<TableColumn> getColumns();

  /**
   * Returns the index of the {@link TableColumn} with the given identifier.
   *
   * @param identifier  the identifier (<code>null</code> not permitted).
   * 
   * @return The index of the {@link TableColumn} with the given identifier.
   * 
   * @throws IllegalArgumentException if <code>identifier</code> is 
   *         <code>null</code> or there is no column with that identifier.
   */
  int getColumnIndex(Object identifier);

  /**
   * Returns the <code>TableColumn</code> at the specified index.
   * 
   * @param columnIndex  the column index.
   * 
   * @return The table column.
   */
  TableColumn getColumn(int columnIndex);

  /**
   * Returns the column margin.
   * 
   * @return The column margin.
   * 
   * @see #setColumnMargin(int)
   */
  int getColumnMargin();

  /**
   * Returns the index of the column that contains the specified x-coordinate,
   * assuming that:
   * <ul>
   * <li>column zero begins at position zero;</li>
   * <li>all columns appear in order;</li>
   * <li>individual column widths are taken into account, but the column margin
   *     is ignored.</li>
   * </ul>
   * If no column contains the specified position, this method returns 
   * <code>-1</code>.
   * 
   * @param xPosition  the x-position.
   * 
   * @return The column index, or <code>-1</code>.
   */
  int getColumnIndexAtX(int xPosition);

  /**
   * Returns total width of all the columns in the model, ignoring the
   * column margin (see {@link #getColumnMargin()}).
   *
   * @return The total width of all the columns.
   */
  int getTotalColumnWidth();

  /**
   * Sets the flag that indicates whether or not column selection is allowed.
   *
   * @param allowed  the new flag value.
   * 
   * @see #getColumnSelectionAllowed()
   */
  void setColumnSelectionAllowed(boolean allowed);

  /**
   * Returns <code>true</code> if column selection is allowed, and 
   * <code>false</code> if column selection is not allowed.
   *
   * @return A boolean.
   * 
   * @see #setColumnSelectionAllowed(boolean)
   */
  boolean getColumnSelectionAllowed();

  /**
   * getSelectedColumns
   * @return Selected columns
   */
  int[] getSelectedColumns();

  /**
   * Returns the number of selected columns in the model.
   * 
   * @return The selected column count.
   * 
   * @see #getSelectionModel()
   */
  int getSelectedColumnCount();

  /**
   * Sets the selection model that will be used to keep track of the selected 
   * columns.
   *
   * @param model  the selection model (<code>null</code> not permitted).
   * 
   * @throws IllegalArgumentException if <code>model</code> is 
   *     <code>null</code>.
   */
  void setSelectionModel(ListSelectionModel model);

  /**
   * Returns the selection model used to track table column selections.
   * 
   * @return The selection model.
   * 
   * @see #setSelectionModel(ListSelectionModel)
   */
  ListSelectionModel getSelectionModel();

  /**
   * Registers a listener with the model, so that it will receive
   * {@link TableColumnModelEvent} notifications.
   *
   * @param listener the listener (<code>null</code> ignored).
   */
  void addColumnModelListener(TableColumnModelListener listener);

  /**
   * Deregisters a listener, so that it will no longer receive 
   * {@link TableColumnModelEvent} notifications.
   * 
   * @param listener  the listener.
   */
  void removeColumnModelListener(TableColumnModelListener listener);
}