/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Dave Hyatt <hyatt@mozilla.org> (Original Author)
 *   Jan Varga <varga@ku.sk>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#include "nsITreeBoxObject.idl"
#include "nsISupportsArray.idl"
#include "domstubs.idl"

interface nsITreeSelection;
interface nsITreeColumn;
interface nsIDOMDataTransfer;

[scriptable, uuid(C06DC4D3-63A2-4422-A0A3-5F2EDDECA8C1)]
interface nsITreeView : nsISupports
{
  /**
   * The total number of rows in the tree (including the offscreen rows).
   */
  readonly attribute long rowCount;

  /**
   * The selection for this view.
   */
  attribute nsITreeSelection selection;

  /** 
   * An atomized list of properties for a given row.  Each property, x, that
   * the view gives back will cause the pseudoclass :moz-tree-row-x
   * to be matched on the pseudoelement ::moz-tree-row.
   */
  void getRowProperties(in long index, in nsISupportsArray properties);

  /**
   * An atomized list of properties for a given cell.  Each property, x, that
   * the view gives back will cause the pseudoclass :moz-tree-cell-x
   * to be matched on the ::moz-tree-cell pseudoelement.
   */
  void getCellProperties(in long row, in nsITreeColumn col, in nsISupportsArray properties);
  
  /**
   * Called to get properties to paint a column background.  For shading the sort
   * column, etc.
   */
  void getColumnProperties(in nsITreeColumn col, in nsISupportsArray properties);

  /**
   * Methods that can be used to test whether or not a twisty should be drawn,
   * and if so, whether an open or closed twisty should be used.
   */
  boolean isContainer(in long index);
  boolean isContainerOpen(in long index);
  boolean isContainerEmpty(in long index);
 
  /**
   * isSeparator is used to determine if the row at index is a separator.
   * A value of true will result in the tree drawing a horizontal separator.
   * The tree uses the ::moz-tree-separator pseudoclass to draw the separator.
   */
  boolean isSeparator(in long index);

  /**
   * Specifies if there is currently a sort on any column. Used mostly by dragdrop
   * to affect drop feedback.
   */
  boolean isSorted();
  
  const short DROP_BEFORE = -1;
  const short DROP_ON = 0;
  const short DROP_AFTER = 1;
  /**
   * Methods used by the drag feedback code to determine if a drag is allowable at
   * the current location. To get the behavior where drops are only allowed on
   * items, such as the mailNews folder pane, always return false when
   * the orientation is not DROP_ON.
   */
  boolean canDrop(in long index, in long orientation, in nsIDOMDataTransfer dataTransfer);

  /**
   * Called when the user drops something on this view. The |orientation| param
   * specifies before/on/after the given |row|.
   */
  void drop(in long row, in long orientation, in nsIDOMDataTransfer dataTransfer);

  /**
   * Methods used by the tree to draw thread lines in the tree.
   * getParentIndex is used to obtain the index of a parent row.
   * If there is no parent row, getParentIndex returns -1.
   */
  long getParentIndex(in long rowIndex);

  /**
   * hasNextSibling is used to determine if the row at rowIndex has a nextSibling
   * that occurs *after* the index specified by afterIndex.  Code that is forced
   * to march down the view looking at levels can optimize the march by starting
   * at afterIndex+1.
   */
  boolean hasNextSibling(in long rowIndex, in long afterIndex);

  /**
   * The level is an integer value that represents
   * the level of indentation.  It is multiplied by the width specified in the 
   * :moz-tree-indentation pseudoelement to compute the exact indendation.
   */
  long getLevel(in long index);

  /**
   * The image path for a given cell. For defining an icon for a cell.
   * If the empty string is returned, the :moz-tree-image pseudoelement
   * will be used.
   */
  AString getImageSrc(in long row, in nsITreeColumn col);

  /**
   * The progress mode for a given cell. This method is only called for
   * columns of type |progressmeter|.
   */
  const short PROGRESS_NORMAL = 1;
  const short PROGRESS_UNDETERMINED = 2;
  const short PROGRESS_NONE = 3;
  long getProgressMode(in long row, in nsITreeColumn col);

  /**
   * The value for a given cell. This method is only called for columns
   * of type other than |text|.
   */
  AString getCellValue(in long row, in nsITreeColumn col);

  /**
   * The text for a given cell.  If a column consists only of an image, then
   * the empty string is returned.  
   */
  AString getCellText(in long row, in nsITreeColumn col);

  /**
   * Called during initialization to link the view to the front end box object.
   */
  void setTree(in nsITreeBoxObject tree);
  
  /**
   * Called on the view when an item is opened or closed.
   */
  void toggleOpenState(in long index);

  /**
   * Called on the view when a header is clicked.
   */
  void cycleHeader(in nsITreeColumn col);

  /**
   * Should be called from a XUL onselect handler whenever the selection changes.
   */
  void selectionChanged();

  /**
   * Called on the view when a cell in a non-selectable cycling column (e.g., unread/flag/etc.) is clicked.
   */
  void cycleCell(in long row, in nsITreeColumn col);
  
  /**
   * isEditable is called to ask the view if the cell contents are editable.
   * A value of true will result in the tree popping up a text field when 
   * the user tries to inline edit the cell.
   */
  boolean isEditable(in long row, in nsITreeColumn col);

  /**
   * isSelectable is called to ask the view if the cell is selectable.
   * This method is only called if the selection style is |cell| or |text|.
   * XXXvarga shouldn't this be called isCellSelectable?
   */
  boolean isSelectable(in long row, in nsITreeColumn col);

  /**
   * setCellValue is called when the value of the cell has been set by the user.
   * This method is only called for columns of type other than |text|.
   */
  void setCellValue(in long row, in nsITreeColumn col, in AString value);

  /**
   * setCellText is called when the contents of the cell have been edited by the user.
   */   
  void setCellText(in long row, in nsITreeColumn col, in AString value);

  /**
   * A command API that can be used to invoke commands on the selection.  The tree
   * will automatically invoke this method when certain keys are pressed.  For example,
   * when the DEL key is pressed, performAction will be called with the "delete" string.
   */
  void performAction(in wstring action);

  /**
   * A command API that can be used to invoke commands on a specific row.
   */
  void performActionOnRow(in wstring action, in long row);

  /**
   * A command API that can be used to invoke commands on a specific cell.
   */
  void performActionOnCell(in wstring action, in long row, in nsITreeColumn col);
};

/**
 * The following interface is not scriptable and MUST NEVER BE MADE scriptable.
 * Native treeviews implement it, and we use this to check whether a treeview
 * is native (and therefore suitable for use by untrusted content).
 */
[uuid(38e0b44d-fa08-458c-83fb-3e10b12aeb45)]
interface nsINativeTreeView : nsITreeView
{
  [noscript] void ensureNative();
};