@qooxdoo/framework/source/class/qx/ui/virtual/layer/Row.js

The JS Framework for Coders

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

   qooxdoo - the new era of web development

   http://qooxdoo.org

   Copyright:
     2004-2009 1&1 Internet AG, Germany, http://www.1und1.de

   License:
     MIT: https://opensource.org/licenses/MIT
     See the LICENSE file in the project's top-level directory for details.

   Authors:
     * Fabian Jakobs (fjakobs)

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


/**
 * EXPERIMENTAL!
 *
 * The Row layer renders row background colors.
 */
qx.Class.define("qx.ui.virtual.layer.Row",
{
  extend : qx.ui.virtual.layer.AbstractBackground,


  /*
  *****************************************************************************
     PROPERTIES
  *****************************************************************************
  */

  properties :
  {
    // overridden
    appearance :
    {
      refine : true,
      init : "row-layer"
    }
  },


  /*
  *****************************************************************************
     MEMBERS
  *****************************************************************************
  */

  members :
  {
    // overridden
    _fullUpdate : function(firstRow, firstColumn, rowSizes, columnSizes)
    {
      var html = [];

      var width = qx.lang.Array.sum(columnSizes);

      var top = 0;
      var row = firstRow;
      var childIndex = 0;

      for (var y=0; y<rowSizes.length; y++)
      {
        var color = this.getColor(row);
        var backgroundColor = color ? "background-color:" + color + ";" : "";

        var decorator = this.getBackground(row);
        var styles = decorator ? qx.bom.element.Style.compile(decorator.getStyles()) : "";

        html.push(
          "<div style='",
          "position: absolute;",
          "left: 0;",
          "top:", top, "px;",
          "height:", rowSizes[y], "px;",
          "width:", width, "px;",
          backgroundColor,
          styles,
          "'>",
          "</div>"
        );
        childIndex++;

        top += rowSizes[y];
        row += 1;
      }

      var el = this.getContentElement().getDomElement();
      // hide element before changing the child nodes to avoid
      // premature reflow calculations
      el.style.display = "none";
      el.innerHTML = html.join("");

      el.style.display = "block";
      this._width = width;
    },


    // overridden
    _updateLayerWindow : function(firstRow, firstColumn, rowSizes, columnSizes)
    {
      if (
        firstRow !== this.getFirstRow() ||
        rowSizes.length !== this.getRowSizes().length ||
        this._width < qx.lang.Array.sum(columnSizes)
      ) {
        this._fullUpdate(firstRow, firstColumn, rowSizes, columnSizes);
      }
    },


    // overridden
    setColor : function(index, color)
    {
      this.base(arguments, index, color);

      if (this.__isRowRendered(index)) {
        this.updateLayerData();
      }
    },


    // overridden
    setBackground : function(index, decorator)
    {
      this.base(arguments, index, decorator);
      if (this.__isRowRendered(index)) {
        this.updateLayerData();
      }
    },


    /**
     * Whether the row with the given index is currently rendered (i.e. in the
     * layer's view port).
     *
     * @param index {Integer} The row's index
     * @return {Boolean} Whether the row is rendered
     */
    __isRowRendered : function(index)
    {
      var firstRow = this.getFirstRow();
      var lastRow = firstRow + this.getRowSizes().length - 1;
      return index >= firstRow && index <= lastRow;
    }
  }
});