ThemeDictionaryExtension.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / ThemeDictionaryExtension.cs / 1305600 / ThemeDictionaryExtension.cs
                        
                        
                            /****************************************************************************\ 
*
* File: ThemeDictionaryExtension.cs
*
* Copyright (C) 2005 by Microsoft Corporation.  All rights reserved. 
*
\***************************************************************************/ 
 
using System;
using System.ComponentModel; 
using System.Collections.Generic;
using System.Diagnostics;
using System.Reflection;
using System.Text; 
using System.Windows;
using System.Windows.Data; 
using System.Windows.Markup; 

 
namespace System.Windows
{
    /// 
    ///  ThemeDictionaryExtension allows application authors to customize 
    ///  control styles based on the current system theme.
    /// 
    ///  
    [MarkupExtensionReturnType(typeof(Uri))]
    public class ThemeDictionaryExtension : MarkupExtension 
    {
        #region Constructors

        ///  
        ///  Constructor that takes no parameters
        ///  
        public ThemeDictionaryExtension() 
        {
        } 

        /// 
        ///  Constructor that takes the name of the assembly that contains the themed ResourceDictionary.
        ///  
        public ThemeDictionaryExtension(string assemblyName)
        { 
            if (assemblyName != null) 
            {
                _assemblyName = assemblyName; 
            }
            else
            {
                throw new ArgumentNullException("assemblyName"); 
            }
        } 
 
        #endregion
 
        #region Public Properties

        /// 
        ///     The name of the assembly that contains the themed ResourceDictionary. 
        /// 
        public string AssemblyName 
        { 
            get { return _assemblyName; }
            set { _assemblyName = value; } 
        }

        #endregion
 
        #region Public Methods
 
        ///  
        ///  Return an object that should be set on the targetObject's targetProperty
        ///  for this markup extension.  For ThemeDictionaryExtension, this is the Uri 
        ///  pointing to theme specific dictionary in the specified assembly by AssemblyName.
        /// 
        /// ServiceProvider that can be queried for services.
        ///  
        ///  The object to set on this property.
        ///  
        public override object ProvideValue(IServiceProvider serviceProvider) 
        {
            if (string.IsNullOrEmpty(AssemblyName)) 
            {
                throw new InvalidOperationException(SR.Get(SRID.ThemeDictionaryExtension_Name));
            }
 
            IProvideValueTarget provideValueTarget = serviceProvider.GetService(typeof(IProvideValueTarget)) as IProvideValueTarget;
            if( provideValueTarget == null ) 
            { 
                throw new InvalidOperationException(SR.Get(SRID.MarkupExtensionNoContext, GetType().Name, "IProvideValueTarget" ));
            } 

            object targetObject = provideValueTarget.TargetObject;
            object targetProperty = provideValueTarget.TargetProperty;
 
            ResourceDictionary dictionary = targetObject as ResourceDictionary;
            PropertyInfo propertyInfo = targetProperty as PropertyInfo; 
 
            // Allow targetProperty to be null or ResourceDictionary.Source
            if (dictionary == null || (targetProperty != null && propertyInfo != SourceProperty)) 
            {
                throw new InvalidOperationException(SR.Get(SRID.ThemeDictionaryExtension_Source));
            }
 
            Register(dictionary, _assemblyName);
            dictionary.IsSourcedFromThemeDictionary = true; 
 
            return GenerateUri(_assemblyName, SystemResources.ResourceDictionaries.ThemedResourceName, MS.Win32.UxThemeWrapper.ThemeName);
        } 

        // Build the Uri for the assembly:
        // /AssemblyName;Component/themes/..xaml
        private static Uri GenerateUri(string assemblyName, string resourceName, string themeName) 
        {
            StringBuilder uri = new StringBuilder(assemblyName.Length + 50); 
 
            uri.Append("/");
            uri.Append(assemblyName); 

            // If assembly is PresentationFramework, append the Theme name
            if (assemblyName.Equals(SystemResources.PresentationFrameworkName, StringComparison.OrdinalIgnoreCase))
            { 
                uri.Append('.');
                uri.Append(themeName); 
            } 

            uri.Append(";component/"); 
            uri.Append(resourceName);
            uri.Append(".xaml");

            return new System.Uri(uri.ToString(), System.UriKind.RelativeOrAbsolute); 
        }
 
        internal static Uri GenerateFallbackUri(ResourceDictionary dictionary, string resourceName) 
        {
            for (int i = 0; i < _themeDictionaryInfos.Count; i++) 
            {
                ThemeDictionaryInfo info = _themeDictionaryInfos[i];

                if (!info.DictionaryReference.IsAlive) 
                {
                    // Remove from list 
                    _themeDictionaryInfos.RemoveAt(i); 
                    i--;
                    continue; 
                }
                if ((ResourceDictionary)info.DictionaryReference.Target == dictionary)
                {
                    string themeName = resourceName.Split('/')[1]; 
                    return GenerateUri(info.AssemblyName, resourceName, themeName);
                } 
            } 
            return null;
        } 

        #endregion

        #region Data 

        private string _assemblyName; 
 
        #endregion
 
        #region Static Data

        // Keep track of all dictionaries that have ThemeDictionaryExtensions applied to them
        // When the theme changes update the Source uri to point to the new theme info 

        // This is the ResourceDictionary.Source property info 
        private static PropertyInfo _sourceProperty; 

        private static PropertyInfo SourceProperty 
        {
            get
            {
                if (_sourceProperty == null) 
                {
                    _sourceProperty = typeof(ResourceDictionary).GetProperty("Source"); 
                } 
                return _sourceProperty;
            } 
        }

        private class ThemeDictionaryInfo
        { 
            public WeakReference DictionaryReference;
            public string AssemblyName; 
        } 

        // Store a list of dictionaries and assembly info's. 
        // When the theme changes, give the dictionaries a new Source Uri

        [ThreadStatic]
        private static List _themeDictionaryInfos; 

        private static void Register(ResourceDictionary dictionary, string assemblyName) 
        { 
            Debug.Assert(dictionary != null, "dictionary should not be null");
            Debug.Assert(assemblyName != null, "assemblyName should not be null"); 

            if (_themeDictionaryInfos == null)
            {
                _themeDictionaryInfos = new List(); 
            }
            ThemeDictionaryInfo info; 
 
            for (int i = 0; i < _themeDictionaryInfos.Count; i++)
            { 
                info = _themeDictionaryInfos[i];

                if (!info.DictionaryReference.IsAlive)
                { 
                    // Remove from list
                    _themeDictionaryInfos.RemoveAt(i); 
                    i--; 
                    continue;
                } 

                if (info.DictionaryReference.Target == dictionary)
                {
                    info.AssemblyName = assemblyName; 
                    return;
                } 
            } 

            // Not present, add to list 
            info = new ThemeDictionaryInfo();
            info.DictionaryReference = new WeakReference(dictionary);
            info.AssemblyName = assemblyName;
 
            _themeDictionaryInfos.Add(info);
 
        } 

        internal static void OnThemeChanged() 
        {
            // Update all resource dictionaries

            if (_themeDictionaryInfos != null) 
            {
                for (int i = 0; i < _themeDictionaryInfos.Count; i++) 
                { 
                    ThemeDictionaryInfo info = _themeDictionaryInfos[i];
 
                    if (!info.DictionaryReference.IsAlive)
                    {
                        // Remove from list
                        _themeDictionaryInfos.RemoveAt(i); 
                        i--;
                        continue; 
                    } 

                    // Provide the new dictionary URI 
                    ResourceDictionary dictionary = (ResourceDictionary)info.DictionaryReference.Target;
                    dictionary.Source = GenerateUri(info.AssemblyName, SystemResources.ResourceDictionaries.ThemedResourceName, MS.Win32.UxThemeWrapper.ThemeName);
                }
            } 
        }
 
        #endregion 
    }
} 


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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ThemeDictionaryExtension.cs source code in C# .NET

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