﻿/* Copyright © 2013-2014 Managing Infrastructure Information Ltd
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification, are permitted provided 
 * that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the 
 * following disclaimer.
 * 
 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and 
 * the following disclaimer in the documentation and/or other materials provided with the distribution.
 * 
 * 3. Neither the name Managing Infrastructure Information Ltd (MIIL) nor the names of its contributors may 
 * be used to endorse or promote products derived from this software without specific prior written 
 * permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED 
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 
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using System;
using System.Globalization;
using System.Windows.Data;

namespace AbsyntaxExcelAddIn.Core.Converters
{
    /// <summary>
    /// Abstract base class for converters that convert objects to <see cref="System.Uri"/> instances 
    /// pointing to PNG image files.
    /// </summary>
    public abstract class PngUriConverterBase : IValueConverter
    {
        protected PngUriConverterBase()
        { }

        /// <summary>
        /// Uses a supplied file name to create a Uri instance defining a path to A PNG image.
        /// </summary>
        /// <param name="fileName">The name of the target image file, excluding extension and path.</param>
        /// <returns>A new Uri instance.</returns>
        protected Uri Create(string fileName)
        {
            return fileName == null ? null : new Uri(String.Format(
                "pack://application:,,,/AbsyntaxExcelAddIn.Core;component/Images/{0}.png", fileName));
        }

        public abstract object Convert(object value, Type targetType, object parameter, CultureInfo culture);

        public abstract object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture);
    }
}