Extensions.cs

// <copyright file="Extensions.cs" company="FC">
// Copyright (c) 2011 Fraser Chapman
// </copyright>
// <author>Fraser Chapman</author>
// <email>fraser.chapman@gmail.com</email>
// <date>2011-03-06</date>
// <summary>This file is part of FC.GEPluginCtrls
// FC.GEPluginCtrls is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see http://www.gnu.org/licenses/.
// </summary>
namespace FC.GEPluginCtrls
{
    using System;
    using System.ComponentModel;
    using System.Reflection;

    /// <summary>
    /// Extension helper methods for enumerations in the control library
    /// </summary>
    internal static class Extensions
    {
        /// <summary>
        /// Gets the internal ID for a Layer
        /// </summary>
        /// <param name="layer">Layer type</param>
        /// <returns>The layer ID or an empty string</returns>
        internal static string GetId(this Layer layer)
        {
            FieldInfo fi = layer.GetType().GetField(layer.ToString());
            DescriptionAttribute[] attributes =
                (DescriptionAttribute[])fi.GetCustomAttributes(typeof(DescriptionAttribute), false);

            if (attributes.Length > 0)
            {
                return attributes[0].Description;
            }

            return string.Empty;
        }

        internal static bool GetInheritedVisibility(this Layer layer, GEWebBrowser browser)
        {
            if (!browser.PluginIsReady)
            {
                return false;
            }

            var target = browser.Plugin.getLayerRoot().getLayerById(layer.GetId());

            if (target == null || !Convert.ToBoolean(target.getVisibility()))
            {
                return false;
            }

            var parent = target.getParentNode();
            return parent != null || GetInheritedVisibility(parent, browser);
        }
    }
}