nsITableEditor.idl

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */


#include "nsISupports.idl"

webidl Element;
webidl Node;
webidl Range;

[scriptable, builtinclass, uuid(4805e684-49b9-11d3-9ce4-ed60bd6cb5bc)]
interface nsITableEditor : nsISupports
{
  const short eNoSearch = 0;
  const short ePreviousColumn = 1;
  const short ePreviousRow = 2;

  /* ------------ Table editing Methods -------------- */

  /** Insert table methods
    * Insert relative to the selected cell or the
    *  cell enclosing the selection anchor
    * The selection is collapsed and is left in the new cell
    *  at the same row,col location as the original anchor cell
    *
    * @param aNumber    Number of items to insert
    * @param aAfter     If TRUE, insert after the current cell,
    *                     else insert before current cell
    */
  void insertTableCell(in long  aNumber, in boolean aAfter);
  void insertTableColumn(in long  aNumber, in boolean aAfter);
  void insertTableRow(in long  aNumber, in boolean aAfter);

  /** Delete table methods
    * Delete starting at the selected cell or the
    *  cell (or table) enclosing the selection anchor
    * The selection is collapsed and is left in the
    *  cell at the same row,col location as
    *  the previous selection anchor, if possible,
    *  else in the closest neigboring cell
    *
    * @param aNumber    Number of items to insert/delete
    */
  void deleteTable();

  /**
   * deleteTableCellContents() removes any contents in cell elements.  If two
   * or more cell elements are selected, this removes all selected cells'
   * contents.  Otherwise, this removes contents of a cell which contains
   * first selection range.  This does nothing without exception if selection
   * is not in cell element.
   */
  void deleteTableCellContents();

  /** Delete cell elements as well as contents
    * @param aNumber   Number of contiguous cells, rows, or columns
    *
    * When there are more than 1 selected cells, aNumber is ignored.
    * For Delete Rows or Columns, the complete columns or rows are
    *  determined by the selected cells. E.g., to delete 2 complete rows,
    *  user simply selects a cell in each, and they don't
    *  have to be contiguous.
    */
  void deleteTableCell(in long  aNumber);

  /**
   * deleteTableColumn() removes cell elements which belong to same columns
   * of selected cell elements.
   * If only one cell element is selected or first selection range is
   * in a cell, removes cell elements which belong to same column.
   * If 2 or more cell elements are selected, removes cell elements which
   * belong to any of all selected columns.  In this case,
   * aNumberOfColumnsToDelete is ignored.
   * If there is no selection ranges, throws exception.
   * If selection is not in a cell element, just does nothing without
   * throwing exception.
   * WARNING: This does not remove <col> nor <colgroup> elements.
   *
   * @param aNumberOfColumnsToDelete    Number of columns to remove.  This is
   *                                    ignored if 2 ore more cells are
   *                                    selected.
   */
  void deleteTableColumn(in long aNumberOfColumnsToDelete);

  /**
   * deleteTableRow() removes <tr> elements.
   * If only one cell element is selected or first selection range is
   * in a cell, removes <tr> elements starting from a <tr> element
   * containing the selected cell or first selection range.
   * If 2 or more cell elements are selected, all <tr> elements
   * which contains selected cell(s).  In this case, aNumberOfRowsToDelete
   * is ignored.
   * If there is no selection ranges, throws exception.
   * If selection is not in a cell element, just does nothing without
   * throwing exception.
   *
   * @param aNumberOfRowsToDelete   Number of rows to remove.  This is ignored
   *                                if 2 or more cells are selected.
   */
  void deleteTableRow(in long aNumberOfRowsToDelete);

  /** Table Selection methods
    * Selecting a row or column actually
    * selects all cells (not TR in the case of rows)
    */
  void selectTableCell();

  /** Select a rectangular block of cells:
    *  all cells falling within the row/column index of aStartCell
    *  to through the row/column index of the aEndCell
    *  aStartCell can be any location relative to aEndCell,
    *   as long as they are in the same table
    *  @param aStartCell  starting cell in block
    *  @param aEndCell    ending cell in block
    */
  void selectBlockOfCells(in Element aStartCell,
                          in Element aEndCell);

  void selectTableRow();
  void selectTableColumn();
  void selectTable();
  void selectAllTableCells();

  /** Create a new TD or TH element, the opposite type of the supplied aSourceCell
    *   1. Copy all attributes from aSourceCell to the new cell
    *   2. Move all contents of aSourceCell to the new cell
    *   3. Replace aSourceCell in the table with the new cell
    *
    *  @param aSourceCell   The cell to be replaced
    *  @return              The new cell that replaces aSourceCell
    */
  Element switchTableCellHeaderType(in Element aSourceCell);

  /** Merges contents of all selected cells
    * for selected cells that are adjacent,
    * this will result in a larger cell with appropriate
    * rowspan and colspan, and original cells are deleted
    * The resulting cell is in the location of the
    *   cell at the upper-left corner of the adjacent
    *   block of selected cells
    *
    * @param aMergeNonContiguousContents:
    *       If true:
    *         Non-contiguous cells are not deleted,
    *         but their contents are still moved
    *         to the upper-left cell
    *       If false: contiguous cells are ignored
    *
    * If there are no selected cells,
    *   and selection or caret is in a cell,
    *   that cell and the one to the right
    *   are merged
    */
  void joinTableCells(in boolean aMergeNonContiguousContents);

  /** Split a cell that has rowspan and/or colspan > 0
    *   into cells such that all new cells have
    *   rowspan = 1 and colspan = 1
    *  All of the contents are not touched --
    *   they will appear to be in the upper-left cell
    */
  void splitTableCell();

  /** Scan through all rows and add cells as needed so
    *   all locations in the cellmap are occupied.
    *   Used after inserting single cells or pasting
    *   a collection of cells that extend past the
    *   previous size of the table
    * If aTable is null, it uses table enclosing the selection anchor
    * This doesn't doesn't change the selection,
    *   thus it can be used to fixup all tables
    *   in a page independent of the selection
    */
  void normalizeTable(in Element aTable);

  /**
   * getCellIndexes() computes row index and column index of a table cell.
   * Note that this depends on layout information.  Therefore, all pending
   * layout should've been flushed before calling this.
   *
   * @param aCellElement        If not null, this computes indexes of the cell.
   *                            If null, this computes indexes of a cell which
   *                            contains anchor of Selection.
   * @param aRowIndex           Must be an object, whose .value will be set
   *                            to row index of the cell.  0 is the first row.
   *                            If rowspan is set to 2 or more, the start
   *                            row index is used.
   * @param aColumnIndex        Must be an object, whose .value will be set
   *                            to column index of the cell.  0 is the first
   *                            column.  If colspan is set to 2 or more, the
   *                            start column index is used.
   */
  void getCellIndexes(in Element aCellElement,
                      out long aRowIndex, out long aColumnIndex);

  /**
   * getTableSize() computes number of rows and columns.
   * Note that this depends on layout information.  Therefore, all pending
   * layout should've been flushed before calling this.
   *
   * @param aTableOrElementInTable  If a <table> element, this computes number
   *                                of rows and columns of it.
   *                                If another element and in a <table>, this
   *                                computes number of rows and columns of
   *                                the nearest ancestor <table> element.
   *                                If element is not in <table> element,
   *                                throwing an exception.
   *                                If null, this looks for nearest ancestor
   *                                <table> element containing anchor of
   *                                Selection.  If found, computes the number
   *                                of rows and columns of the <table>.
   *                                Otherwise, throwing an exception.
   * @param aRowCount               Number of *actual* row count.
   *                                I.e., rowspan does NOT increase this value.
   * @param aColumnCount            Number of column count.
   *                                I.e., if colspan is specified with bigger
   *                                number than actual, the value is used
   *                                as this.
   */
  void getTableSize(in Element aTableOrElementInTable,
                    out long aRowCount, out long aColCount);

  /**
   * getCellAt() returns a <td> or <th> element in a <table> if there is a
   * cell at the indexes.
   *
   * @param aTableElement       If not null, must be a <table> element.
   *                            If null, looks for the nearest ancestor <table>
   *                            to look for a cell.
   * @param aRowIndex           Row index of the cell.
   * @param aColumnIndex        Column index of the cell.
   * @return                    Returns a <td> or <th> element if there is.
   *                            Otherwise, returns null without throwing
   *                            exception.
   *                            If aTableElement is not null and not a <table>
   *                            element, throwing an exception.
   *                            If aTableElement is null and anchor of Selection
   *                            is not in any <table> element, throwing an
   *                            exception.
   */
  Element getCellAt(in Element aTableElement,
                    in long aRowIndex, in long aColumnIndex);

  /** Get a cell at cellmap grid coordinates and associated data
    * A cell that spans across multiple cellmap locations will
    *   be returned multiple times, once for each location it occupies
    * Examine the returned aStartRowIndex and aStartColIndex to see
    *   if it is in the same layout column or layout row:
    *   A "layout row" is all cells sharing the same top edge
    *   A "layout column" is all cells sharing the same left edge
    *   This is important to determine what to do when inserting or deleting a column or row
    *
    *  @param aTable                   A table in the document
    *  @param aRowIndex, aColIndex     The 0-based cellmap indexes
    * returns values:
    *  @param aCell                    The cell at this cellmap location
    *  @param aStartRowIndex           The row index where cell starts
    *  @param aStartColIndex           The col index where cell starts
    *  @param aRowSpan                 May be 0 (to span down entire table) or number of cells spanned
    *  @param aColSpan                 May be 0 (to span across entire table) or number of cells spanned
    *  @param aActualRowSpan           The actual number of cellmap locations (rows) spanned by the cell
    *  @param aActualColSpan           The actual number of cellmap locations (columns) spanned by the cell
    *  @param aIsSelected
    *  @param
    *
    * (in C++ returns: NS_EDITOR_ELEMENT_NOT_FOUND if an element is not found
    *  passes NS_SUCCEEDED macro)
    */
  void getCellDataAt(in Element aTable,
                     in long  aRowIndex, in long  aColIndex,
                     out Element aCell,
                     out long  aStartRowIndex, out long  aStartColIndex,
                     out long  aRowSpan, out long  aColSpan,
                     out long  aActualRowSpan, out long  aActualColSpan,
                     out boolean aIsSelected);

  /**
   * getFirstRow() returns first <tr> element in a <table> element.
   *
   * @param aTableOrElementInTable  If a <table> element, returns its first
   *                                <tr> element.
   *                                If another element, looks for nearest
   *                                ancestor <table> element first.  Then,
   *                                return its first <tr> element.
   * @return                        <tr> element in the <table> element.
   *                                If <table> element is not found, this
   *                                throws an exception.
   *                                If there is a <table> element but it
   *                                does not have <tr> elements, returns
   *                                null without throwing exception.
   *                                Note that this may return anonymous <tr>
   *                                element if <table> has one or more cells
   *                                but <tr> element is not in the source.
   */
  Element getFirstRow(in Element aTableElement);

  /** Preferred direction to search for neighboring cell
    * when trying to locate a cell to place caret in after
    * a table editing action.
    * Used for aDirection param in SetSelectionAfterTableEdit
    */

  /**
   * getSelectedOrParentTableElement() returns a <td>, <th>, <tr> or <table>.
   * If first selection range selects a <td> or <th>, returns it.  aTagName
   * is set to "td" even if the result is a <th> and aCount is set to
   * Selection.rangeCount.
   * If first selection range does not select <td> nor <th>, but selection
   * anchor refers <table>, returns it.  aTagName is set to "table" and
   * aCount is set to 1.
   * If first selection range does not select <td> nor <th>, but selection
   * anchor refers <tr>, returns it.  aTagName is set to "tr" and aCount is
   * set to 1.
   * If first selection range does not select <td> nor <th>, but selection
   * anchor refers <td> (not include <th>!), returns it.  aTagName is set to
   * "td" and aCount is set to 0.
   * Otherwise, if container of selection anchor is in a <td> or <th>,
   * returns it.  aTagName is set to "td" but aCount is set to 0.
   * Otherwise, returns null, aTagName is set to empty string and aCount is
   * set to 0.  I.e., does not throw exception even if a cell is not found.
   * NOTE: Calling this resets internal counter of getFirstSelectedCell()
   *       and getNextSelectedCell().  I.e., getNextSelectedCell() will
   *       return second selected cell element.
   */
  Element getSelectedOrParentTableElement(out AString aTagName,
                                          out long aCount);

  /** Generally used after GetSelectedOrParentTableElement
    *   to test if selected cells are complete rows or columns
    *
    * @param aElement           Any table or cell element or any element
    *                           inside a table
    *                           Used to get enclosing table.
    *                           If null, selection's anchorNode is used
    *
    * @return
    *     0                        aCellElement was not a cell
    *                              (returned result = NS_ERROR_FAILURE)
    *     TableSelection::Cell     There are 1 or more cells selected but
    *                              complete rows or columns are not selected
    *     TableSelection::Row      All cells are in 1 or more rows
    *                              and in each row, all cells selected
    *                              Note: This is the value if all rows
    *                              (thus all cells) are selected
    *     TableSelection::Column   All cells are in 1 or more columns
    *                              and in each column, all cells are selected
    */
  uint32_t getSelectedCellsType(in Element aElement);

  /**
   * getFirstSelectedCell() returns a <td> or <th> element if first range of
   * Selection selects only one table cell element (i.e., startContainer and
   * endContainer are same <tr> element and startOffset + 1 equals endOffset).
   * If first range of Selection does not select a table cell element, this
   * returns null.  However, if Selection has no range, this throws an
   * exception.
   *
   * @param aFirstRangeOfSelection [OUT] Returns the first range of Selection
   *                               only when this returns a <td> or <th>
   *                               element.  Otherwise, returns null.
   * @return                       A <td> or <th> element if first range of
   *                               Selection selects only one table cell
   *                               element.
   */
  Element getFirstSelectedCell(out Range aFirstRangeOfSelection);

  /**
   * getFirstSelectedCellInTable() returns a cell element, its row index and
   * its column index if first range of Selection selects a cell.  Note that
   * that "selects a cell" means that the range container is a <tr> element
   * and endOffset is startOffset + 1.  So, even if first range of Selection
   * is in a cell element, this treats the range does not select a cell.
   * NOTE: Calling this resets internal counter of getFirstSelectedCell()
   *       and getNextSelectedCell().  I.e., getNextSelectedCell() will
   *       return second selected cell element.
   *
   * @param aRowIndex    [OUT} Returns row index of the found cell.  If not
   *                     found, returns 0.
   * @param aColumnIndex [OUT] Returns column index of the found cell.  If
   *                     not found, returns 0.
   * @return             The cell element which is selected by the first
   *                     range of Selection.  Even if this is not found,
   *                     this returns null, not throwing exception.
   */
  Element getFirstSelectedCellInTable(out long aRowIndex, out long aColIndex);

  /**
   * getNextSelectedCell() is a stateful method to retrieve selected table
   * cell elements which are selected by 2nd or later ranges of Selection.
   * When you call getFirstSelectedCell(), it resets internal counter of
   * this method.  Then, following calls of getNextSelectedCell() scans the
   * remaining ranges of Selection.  If a range selects a <td> or <th>
   * element, returns the cell element.  If a range selects an element but
   * neither <td> nor <th> element, this ignores the range.  If a range is
   * in a text node, returns null without throwing exception, but stops
   * scanning the remaining ranges even you call this again.
   * Note that this may cross <table> boundaries since this method just
   * scans all ranges of Selection.  Therefore, returning cells which
   * belong to different <table> elements.
   *
   * @param aNextSelectedCellRange [OUT] Returns null if this method returns
   *                               null.  Otherwise, i.e., found a range which
   *                               selects a <td> or <th> element, returns the
   *                               range.
   * @return                       A <td> or <th> element if one of remaining
   *                               ranges selects a <td> or <th> element unless
   *                               this does not meet a range in a text node.
   */
  Element getNextSelectedCell(out Range aNextSelectedCellRange);
};