/* ************************************************************************

   qooxdoo - the new era of web development

   http://qooxdoo.org

   Copyright:
     2004-2006 by 1&1 Internet AG, Germany, http://www.1and1.org

   License:
     LGPL 2.1: http://www.gnu.org/licenses/lgpl.html

   Authors:
     * Sebastian Werner (wpbasti)
     * Andreas Ecker (ecker)

************************************************************************ */

/* ************************************************************************

#module(ui_tree)

************************************************************************ */

qx.OO.defineClass("qx.manager.selection.TreeSelectionManager", qx.manager.selection.SelectionManager,
function(vBoundedWidget) {
  qx.manager.selection.SelectionManager.call(this, vBoundedWidget);
});

/*!
Should multiple selection be allowed?
*/
qx.OO.changeProperty({ name : "multiSelection", type : "boolean", defaultValue : false });

/*!
Enable drag selection?
*/
qx.OO.changeProperty({ name : "dragSelection", type : "boolean", defaultValue : false });





/*
---------------------------------------------------------------------------
  MAPPING TO BOUNDED WIDGET
---------------------------------------------------------------------------
*/

qx.Proto._getFirst = function() {
  return qx.lang.Array.getFirst(this.getItems());
}

qx.Proto._getLast = function() {
  return qx.lang.Array.getLast(this.getItems());
}

qx.Proto.getItems = function() {
  return this.getBoundedWidget().getItems();
}

qx.Proto.getNext = function(vItem)
{
  if (vItem)
  {
    if (qx.ui.tree.Tree.isOpenTreeFolder(vItem))
    {
      return vItem.getFirstVisibleChildOfFolder();
    }
    else if (vItem.isLastVisibleChild())
    {
      var vCurrent = vItem;

      while(vCurrent && vCurrent.isLastVisibleChild()) {
        vCurrent = vCurrent.getParentFolder();
      }

      if (vCurrent && vCurrent instanceof qx.ui.tree.AbstractTreeElement && vCurrent.getNextVisibleSibling() && vCurrent.getNextVisibleSibling() instanceof qx.ui.tree.AbstractTreeElement) {
        return vCurrent.getNextVisibleSibling();
      }
    }
    else
    {
      return vItem.getNextVisibleSibling();
    }
  }
  else
  {
    return this.getBoundedWidget().getFirstTreeChild();
  }
}

qx.Proto.getPrevious = function(vItem)
{
  if (vItem)
  {
    if (vItem == this.getBoundedWidget())
    {
      return;
    }
    else if (vItem.isFirstVisibleChild())
    {
      if (vItem.getParentFolder() instanceof qx.ui.tree.TreeFolder) {
        return vItem.getParentFolder();
      }
    }
    else
    {
      var vPrev = vItem.getPreviousVisibleSibling();

      while (vPrev instanceof qx.ui.tree.AbstractTreeElement)
      {
        if (qx.ui.tree.Tree.isOpenTreeFolder(vPrev))
        {
          vPrev = vPrev.getLastVisibleChildOfFolder();
        }
        else
        {
          break;
        }
      }

      return vPrev;
    }
  }
  else
  {
    return this.getBoundedWidget().getLastTreeChild();
  }
}







/*
---------------------------------------------------------------------------
  MAPPING TO ITEM DIMENSIONS
---------------------------------------------------------------------------
*/

qx.Proto.getItemTop = function(vItem)
{
  // Alternate method:
  // return qx.dom.Location.getPageBoxTop(vItem.getElement()) - qx.dom.Location.getPageInnerTop(this.getBoundedWidget().getElement());

  var vBoundedWidget = this.getBoundedWidget();
  var vElement = vItem.getElement();
  var vOffset = 0;

  while (vElement && vElement.qx_Widget != vBoundedWidget)
  {
    vOffset += vElement.offsetTop;
    vElement = vElement.parentNode;
  }

  return vOffset;
}

qx.Proto.getItemHeight = function(vItem)
{
  if (vItem instanceof qx.ui.tree.TreeFolder && vItem._horizontalLayout)
  {
    return vItem._horizontalLayout.getOffsetHeight();
  }
  else
  {
    return vItem.getOffsetHeight();
  }
}

qx.Proto.scrollItemIntoView = function(vItem)
{
  if (vItem instanceof qx.ui.tree.TreeFolder && vItem._horizontalLayout)
  {
    return vItem._horizontalLayout.scrollIntoView();
  }
  else
  {
    return vItem.scrollIntoView();
  }
}





/*
---------------------------------------------------------------------------
  ITEM STATE MANAGMENT
---------------------------------------------------------------------------
*/

qx.Proto.renderItemSelectionState = function(vItem, vIsSelected) {
  vItem.setSelected(vIsSelected);
}