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

   qooxdoo - the new era of web development

   http://qooxdoo.org

   Copyright:
     2007 Derrell Lipman

   License:
     LGPL: http://www.gnu.org/licenses/lgpl.html
     EPL: http://www.eclipse.org/org/documents/epl-v10.php
     See the LICENSE file in the project's top-level directory for details.

   Authors:
     * Derrell Lipman (derrell)

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

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

#module(treevirtual)
#embed(qx.icontheme/16/status/folder-open.png)
#embed(qx.icontheme/16/places/folder.png)
#embed(qx.icontheme/16/actions/document-open.png)
#embed(qx.icontheme/16/actions/document-new.png)
#embed(qx.widgettheme/tree/*)
#embed(qx.static/blank.gif)

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

/**
 * A data cell renderer for the tree column of a simple tree
 */
qx.OO.defineClass("qx.ui.treevirtual.SimpleTreeDataCellRenderer",
                  qx.ui.table.AbstractDataCellRenderer,
function()
{
  qx.ui.table.AbstractDataCellRenderer.call(this);

  // Base URL used for indent images
  var Am = qx.manager.object.AliasManager;
  this.WIDGET_TREE_URI = Am.getInstance().resolvePath("widget/tree/");
  this.STATIC_IMAGE_URI = Am.getInstance().resolvePath("static/image/")
});


/**
 * Set whether lines linking tree children shall be drawn on the tree.
 */
qx.OO.addProperty({
                    name         : "useTreeLines",
                    type         : "boolean",
                    defaultValue : true,
                    getAlias     : "useTreeLines"
                  });

/*
 * When true, exclude only the first-level tree lines, creating, effectively,
 * multiple unrelated root nodes.
 */
qx.OO.addProperty({
                    name         : "excludeFirstLevelTreeLines",
                    type         : "boolean",
                    defaultValue : false
                  });


/**
 * Set whether the open/close button should be displayed on a branch, even if
 * the branch has no children.
 */
qx.OO.addProperty({
                    name         : "alwaysShowOpenCloseSymbol",
                    type         : "boolean",
                    defaultValue : false
                  });




// overridden
qx.Proto._getCellStyle = function(cellInfo)
{
  var node = cellInfo.value;

  // Return the style for the div for the cell.  If there's cell-specific
  // style information provided, append it.
  var html =
    cellInfo.style +
    qx.ui.treevirtual.SimpleTreeDataCellRenderer.MAIN_DIV_STYLE +
    (node.cellStyle ? node.cellStyle + ";" : "");
  return html;
};


// overridden
qx.Proto._getContentHtml = function(cellInfo)
{
  var html = "";
  var node = cellInfo.value;
  var imageUrl;
  var _this = this;
  var Stdcr = qx.ui.treevirtual.SimpleTreeDataCellRenderer;

  function addImage(urlAndToolTip)
  {
    var html = Stdcr.IMG_START;
    var Am = qx.manager.object.AliasManager;

    if (qx.core.Client.getInstance().isMshtml() &&
        /\.png$/i.test(urlAndToolTip.url))
    {
      html +=
        this.STATIC_IMAGE_URI + "blank.gif" +
        '" style="filter:' +
        "progid:DXImageTransform.Microsoft.AlphaImageLoader(" +
        "  src='" +
        Am.getInstance().resolvePath(urlAndToolTip.url) +
        "',sizingMethod='scale')";
    }
    else
    {
      var imageUrl = Am.getInstance().resolvePath(urlAndToolTip.url);
      html += imageUrl + '" style="';
    }

    if (urlAndToolTip.imageWidth && urlAndToolTip.imageHeight)
    {
      html +=
        ';width:' + urlAndToolTip.imageWidth + 'px' +
        ';height:' + urlAndToolTip.imageHeight + 'px';
    }

    var tooltip = urlAndToolTip.tooltip;
    if (tooltip != null)
    {
      html += Stdcr.IMG_TITLE_START + tooltip;
    }
    html += Stdcr.IMG_END;

    return html;
  }

  // Generate the indentation.  Obtain icon determination values once rather
  // than each time through the loop.
  var bUseTreeLines = this.getUseTreeLines();
  var bExcludeFirstLevelTreeLines = this.getExcludeFirstLevelTreeLines();
  var bAlwaysShowOpenCloseSymbol = this.getAlwaysShowOpenCloseSymbol();

  for (var i = 0; i < node.level; i++)
  {
    imageUrl = this._getIndentSymbol(i,
                                     node,
                                     bUseTreeLines,
                                     bAlwaysShowOpenCloseSymbol,
                                     bExcludeFirstLevelTreeLines);
    html += addImage({
                       url         : imageUrl,
                       imageWidth  : 19,
                       imageHeight : 16
                     });
  }

  // Add the node's icon
  imageUrl = (node.bSelected ? node.iconSelected : node.icon);
  if (! imageUrl)
  {
    if (node.type == qx.ui.treevirtual.SimpleTreeDataModel.Type.LEAF)
    {
      imageUrl = (node.bSelected
                  ? "icon/16/actions/document-open.png"
                  : "icon/16/actions/document-new.png");
    }
    else
    {
      imageUrl = (node.bSelected
                  ? "icon/16/status/folder-open.png"
                  : "icon/16/places/folder.png");
    }
  }
  html += addImage({
                     url         : imageUrl,
                     imageWidth  : 16,
                     imageHeight : 16
                   });

  // Add the node's label.  We calculate the "left" property with: each tree
  // line (indentation) icon is 19 pixels wide; the folder icon is 16 pixels
  // wide, there are two pixels of padding at the left, and we want 2 pixels
  // between the folder icon and the label
  html +=
    '<div style="position:absolute;' +
    'left:' + ((node.level * 19) + 16 + 2 + 2) + ';' +
    'top:0' +
    (node.labelStyle ? ";" + node.labelStyle : "") +
    ';">' +
    node.label +
    '</div>';

  return html;
};


/**
 * Determine the symbol to use for indentation of a tree row, at a particular
 * column.  The indentation to use may be just white space or may be a tree
 * line.  Tree lines come in numerous varieties, so the appropriate one is
 * selected.
 *
 * @param column {Integer}
 *   The column of indentation being requested, zero-relative
 *
 * @param node
 *   The node being displayed in the row.  The properties of a node are
 *   described in {@link qx.ui.treevirtual.SimpleTreeDataModel}
 *
 * @param bUseTreeLines {Boolean}
 *   Whether to find an appropriate tree line icon, or simply provide white
 *   space.
 *
 * @param bAlwaysShowOpenCloseSymbol {Boolean}
 *   Whether to display the open/close icon for a node even if it has no
 *   children.
 *
 * @param bExcludeFirstLevelTreeLines {Boolean}
 *   If bUseTreeLines is enabled, then further filtering of the left-most tree
 *   line may be specified here.  If <i>true</i> then the left-most tree line,
 *   between top-level siblings, will not be displayed.  If <i>false</i>, then
 *   the left-most tree line wiill be displayed just like all of the other
 *   tree lines.
 */
qx.Proto._getIndentSymbol = function(column,
                                     node,
                                     bUseTreeLines,
                                     bAlwaysShowOpenCloseSymbol,
                                     bExcludeFirstLevelTreeLines)
{
  // If we're in column 0 and excludeFirstLevelTreeLines is enabled, then
  // we treat this as if no tree lines were requested.
  if (column == 0 && bExcludeFirstLevelTreeLines)
  {
    bUseTreeLines = false;
  }

  // If we're not on the final column...
  if (column < node.level - 1)
  {
    // then return either a line or a blank icon, depending on bUseTreeLines
    return (bUseTreeLines && ! node.lastChild[column]
            ? this.WIDGET_TREE_URI + "line.gif"
            : this.STATIC_IMAGE_URI + "blank.gif");
  }

  var bLastChild = node.lastChild[node.lastChild.length - 1];

  // Is this a branch node that does not have the open/close button hidden?
  if (node.type == qx.ui.treevirtual.SimpleTreeDataModel.Type.BRANCH &&
      ! node.bHideOpenClose)
  {
    // Yup.  Determine if this node has any children
    var child = null;
    for (child in node.children)
    {
      // If we find even one, we're done here.
      break;
    }

    // Does this node have any children, or do we always want the open/close
    // symbol to be shown?
    if (child !== null || bAlwaysShowOpenCloseSymbol)
    {
      // If we're not showing tree lines...
      if (! bUseTreeLines)
      {
        // ... then just use a plus or minus
        return (node.bOpened
                ? this.WIDGET_TREE_URI + "minus.gif"
                : this.WIDGET_TREE_URI + "plus.gif");
      }

      // Are we looking at a top-level, first child of its parent?
      if (column == 0 && node.bFirstChild)
      {
        // Yup.  If it's also a last child...
        if (bLastChild)
        {
          // ... then use no tree lines.
          return (node.bOpened
                  ? this.WIDGET_TREE_URI + "only_minus.gif"
                  : this.WIDGET_TREE_URI + "only_plus.gif");
        }
        else
        {
          // otherwise, use descender lines but no ascender.
          return (node.bOpened
                  ? this.WIDGET_TREE_URI + "start_minus.gif"
                  : this.WIDGET_TREE_URI + "start_plus.gif");
        }
      }

      // It's not a top-level, first child.  Is this the last child of its
      // parent?
      if (bLastChild)
      {
        // Yup.   Return an ending plus or minus, or blank if node.bOpened so
        // indicates.
        return (node.bOpened
                ? this.WIDGET_TREE_URI + "end_minus.gif"
                : this.WIDGET_TREE_URI + "end_plus.gif");
      }

      // Otherwise, return a crossing plus or minus, or a blank if
      // node.bOpened so indicates.
      return (node.bOpened
              ? this.WIDGET_TREE_URI + "cross_minus.gif"
              : this.WIDGET_TREE_URI + "cross_plus.gif");
    }
  }

  // This node does not have any children.  Return an end or cross, if we're
  // using tree lines.
  if (bUseTreeLines)
  {
    // If this is a last child, return and ending line; otherwise cross.
    return (bLastChild
            ? this.WIDGET_TREE_URI + "end.gif"
            : this.WIDGET_TREE_URI + "cross.gif");
  }

  return this.STATIC_IMAGE_URI + "blank.gif";
};


qx.Class.MAIN_DIV_STYLE =
  ';overflow:hidden;white-space:nowrap;border-right:1px solid #eeeeee;' +
  'padding-left:2px;padding-right:2px;cursor:default' +
  (qx.core.Client.getInstance().isMshtml() ? '' : ';-moz-user-select:none;');

qx.Class.IMG_START = '<img src="';
qx.Class.IMG_END = '"/>';
qx.Class.IMG_TITLE_START = '" title="';