改進NikhilKothari的換膚方案

1、在 Silverlight 下換膚的實現中，我介紹了 Nikhil Kothari 實現的一種 Theme 方案。但是實踐了一下，我很快發(fā)現有個小小的缺陷。作者的皮膚定義是僅針對系統自帶的控件的，如 Button, T extBox, CheckBox 等，而對于我們自定義的控件的換膚問題沒有很好的解決。從下列代碼中可見一斑：(/Framework/Applications/Theme.cs)publicstringGetXml()stringresourceDictionaryFormat="<UserControlxmlns=""xmlns:x=&quo

2、t;"xmlns:vsm=""clr-namespace:System.Windows;assembly=System.Windows""><UserControl.Resources>0</UserControl.Resources></UserControl>"_content.Replace("xmlns="""");_content.Replace("xmlns:x="""");_con

3、tent.Replace("xmlns:vsm=""clr-namespace:System.Windows;assembly=System.Windows""","");returnString.Format(resourceDictionaryFormat,_content.ToString();方案范文無法思考和涵蓋全面，最好仔細瀏覽后下載使用?？梢钥闯鲞@里名稱空間都是寫死了的，不支持任何擴展。而實際使用中，我們可能會對某個第三方控件定義樣式。比如：方案范文無法思考和涵蓋全面，最好仔細瀏覽后下載使用。<

4、UserControlxmlns="xmlns:x="xmlns:d="xmlns:mc="/markup-compatibility/2006"xmlns:liquid="clr-namespace:Liquid;assembly=Liquid"mc:Ignorable="d"x:Class="UserControl"d:DesignWidth="640"d:DesignHeight="48

5、0"><UserControl.Resources><Stylex:Key="MyLiquidDialog"TargetType="liquid:Dialog"><!-略-></Style></UserControl.Resources><Gridx:Name="LayoutRoot"Background="White"/></UserControl>這里定義了 Liquid 這套組件中 Dialog 控件的樣式，而

6、其中 xmlns:liquid 這個名稱空間的聲明就是必須的。要達到這個目標，我們可以修改 Theme.cs 的 parse 步驟，在其過程中補充一段收集 xml namespace 的代碼，并在合并最終的樣式 xaml 時加進去即可。修改過的 Theme.cs 代碼如下：方案范文無法思考和涵蓋全面，最好仔細瀏覽后下載使用。修改過的Theme.cs/Theme.cs/Copyright(c)NikhilKothari,2008.AllRightsReserved./Thisproduct'scopyrightsarelicensedundertheCreative/CommonsAtt

7、ribution-ShareAlike(version2.5).B//licenses/by-sa/2.5/Youarefreeto:/-usethisframeworkaspartofyourapp/-makeuseoftheframeworkinacommercialapp/aslongasyourapporproductisitselfnotaframework,controlpackor/developertoolkitofanysortunderthefollowingconditions:/Attribution.Youmustat

8、tributetheoriginalworkinyour/productorrelease./ShareAlike.Ifyoualter,transform,orbuildas-isuponthiswork,/youmayonlydistributetheresultingappsourceunder/alicenseidenticaltothisone./usingSystem;usingSystem.Collections.Generic;usingSystem.IO;usingSystem.Text;usingSystem.Windows;usingSystem.Windows.Brow

9、ser;usingSystem.Windows.Controls;usingSystem.Windows.Markup;usingSystem.Windows.Resources;usingSystem.Xml;namespaceSilverlight.FX.Applications/<summary>/Representsathemecontrol,whosetop-levelresourceitemsaretobeincluded/whenthisthemeisselected./</summary>publicclassTheme:UserControlpriva

10、testring_includes;/<summary>/Anyadditionalthemestoinclude.Eachoftheadditionalthemesmustcontain/aUserControldeclaration.Thelistofthemesareprocessedinorderafter/thecurrenttheme'sresourceitemshavebeenincluded./</summary>publicstringIncludesgetreturn_includes?String.Empty;set_includes=va

11、lue;privatestaticvoidExtractThemeContent(stringxml,ThemeInfotheme,boolextractIncludes)XmlReaderxmlReader=XmlReader.Create(newStringReader(xml),newXmlReaderSettingsCheckCharacters=false,DtdProcessing=DtdProcessing.Ignore,IgnoreComments=true,IgnoreProcessingInstructions=true,IgnoreWhitespace=true,);wh

12、ile(xmlReader.Read()if(xmlReader.NodeType=XmlNodeType.Element)/Foundthefirstelement/保存元素節(jié)點名稱，因為下面要跳到屬性去讀取varelementName=xmlReader.Name;if(extractIncludes)theme.Includes=xmlReader.GetAttribute("Includes");/添加名稱空間varhasAttr=xmlReader.MoveToFirstAttribute();if(hasAttr)doif(xmlReader.Name.Star

13、tsWith("xmlns:")varval=xmlReader.ReadContentAsString();theme.AddNamespace(xmlReader.Name,val);while(xmlReader.MoveToNextAttribute();stringresourcesTag=elementName+".Resources"/改為由父節(jié)點屬性讀到指定名稱的子節(jié)點.不能用ReadToDescendant.if(xmlReader.ReadToFollowing(resourcesTag)/if(xmlReader.ReadToDes

14、cendant(resourcesTag)xmlReader.MoveToContent();/TODO:IwouldhaveexpectedMoveToContenttomovetothefirstitem/withinthecurrenttag,butapparentlythereaderisstill/positionedatthecurrenttag,unlessaReadisperformed.xmlReader.Read();while(xmlReader.EOF=false)if(xmlReader.NodeType=XmlNodeType.Element)stringkey=x

15、mlReader.GetAttribute("x:Key");if(String.IsNullOrEmpty(key)=false)&&(theme.ContainsKey(key)=false)stringmarkup=xmlReader.ReadOuterXml();theme.AddItem(key,markup);elsexmlReader.Skip();else/Nomoreitemsbreak;/Weonlylookattheresourcesoftheroottag,andsowe'redonebreak;privatestaticst

16、ringGetThemeXaml(stringthemeName,stringfileName,boollookupShared)StreamResourceInforesourceInfo=null;/Firsttry/Themes/<ThemeName>/<FileName>.xamlUriresourceUri=newUri("Themes/"+themeName+"/"+fileName+".xaml",UriKind.Relative);resourceInfo=Application.GetReso

17、urceStream(resourceUri);if(resourceInfo=null)&&lookupShared)/Thefallbackisonelevelup,i.e./Themes/<FileName>.xamlresourceUri=newUri("Themes/"+fileName+".xaml",UriKind.Relative);resourceInfo=Application.GetResourceStream(resourceUri);if(resourceInfo=null)thrownewInval

18、idOperationException("Thefilenamed'"+fileName+"inthethemenamed'"+themeName+"'couldnotbefound.");StreamReaderresourceReader=newStreamReader(resourceInfo.Stream);returnresourceReader.ReadToEnd();internalstaticvoidLoadTheme(ResourceDictionarytargetResources,str

19、ingname)ThemeInfotheme=newThemeInfo();stringthemeXaml=GetThemeXaml(name,"Theme",/*lookupShared*/false);tryExtractThemeContent(themeXaml,theme,/*extractIncludes*/true);if(theme.Includes.Length=0)&&(theme.Keys.Count!=0)UserControluserControl=(UserControl)XamlReader.Load(themeXaml);Re

20、sourceDictionarythemeResources=userControl.Resources;foreach(stringkeyintheme.Keys)targetResources.Add(key,themeResourceskey);return;catch(Exceptione)thrownewInvalidOperationException("Thethemenamed'"+name+"'containedinvalidXAML.",e);if(theme.Includes.Length!=0)stringincl

21、udes=theme.Includes.Split(newchar',','',StringSplitOptions.RemoveEmptyEntries);for(inti=0;i<includes.Length;i+)stringincludeXaml=GetThemeXaml(name,includesi,/*lookupShared*/true);tryExtractThemeContent(includeXaml,theme,/*extractIncludes*/false);catch(Exceptione)thrownewInvalidOpe

22、rationException("Theincludenamed'"+includesi+"'inthethemenamed'"+name+"'containedinvalidXAML.",e);trystringmergedXaml=theme.GetXml();UserControluserControl=(UserControl)XamlReader.Load(mergedXaml);ResourceDictionarythemeResources=userControl.Resources;fo

23、reach(stringkeyintheme.Keys)targetResources.Add(key,themeResourceskey);catch(Exceptione)thrownewInvalidOperationException("Thethemenamed'"+name+"'containedinvalidXAML.",e);privatesealedclassThemeInfoprivateStringBuilder_content;privateList<string>_keys;privateDictio

24、nary<string,string>_keyMap;privatestring_includes;publicThemeInfo()_content=newStringBuilder();_keys=newList<string>();_keyMap=newDictionary<string,string>();InitXmlNamespaces();publicstringIncludesgetreturn_includes?String.Empty;set_includes=value;publicICollection<string>Ke

25、ysgetreturn_keys;publicvoidAddItem(stringkey,stringxml)_keyMapkey=String.Empty;_keys.Add(key);_content.Append(xml);publicboolContainsKey(stringkey)return_keyMap.ContainsKey(key);/增加自定義名稱空間的功能privateDictionary<string,string>_xmlNamespaces;/初始化名稱空間字典privatevoidInitXmlNamespaces()_xmlNamespaces=newDictionary<string,string>();_xmlNamespaces"xmlns"="_xmlNamespaces"xmlns:x"="_xmlNamespaces"xmlns:vsm"="clr-namespace:System.Windows;assembly=System.Windows"/組合名稱空間屬性privatestringGetNamespaceAttributes()va