CaseStudy(showcase)数据篇-Loading的制作

做silvelight也有一段时间了，相册、游戏，刚刚完成的showcase这个小程序算是一个阶段了。这里就以showcase这个项目来做一下CaseStudy。

数据篇-Loading的制作

silverlight自带了一个loading。但是由于界面的需求可能需要定制化一下。这里我的思路是做两个sl文件用其中一个去加载另外一个。也就是说有两个xap文件一个是主要的也就是你做的silverlight程序文件，另一个小的是用来做loading的。

参考文章： 技巧：在Silverlight中如何访问外部xap文件中UserControl

 

public   partial   class  Page : UserControl
    {
         public  Page()
        {
            InitializeComponent();
            App.Current.Host.Content.Resized  +=   new  EventHandler(Content_Resized);
            App.Current.Host.Content.FullScreenChanged  +=   new  EventHandler(Content_FullScreenChanged);

             this .Init();
        }

         private   void  Init()
        {
            Uri address  =   new  Uri(HtmlPage.Document.DocumentUri,  " ClientBin/showcase.xap " );
            WebClient webClient  =   new  WebClient();
            webClient.OpenReadCompleted  +=   new  OpenReadCompletedEventHandler(webClient_OpenReadCompleted);
            webClient.DownloadProgressChanged  +=   new  DownloadProgressChangedEventHandler(webClient_DownloadProgressChanged);
            webClient.OpenReadAsync(address);

        }

         void  webClient_DownloadProgressChanged( object  sender, DownloadProgressChangedEventArgs e)
        {
             // 在这里实现你的loading动画
             double  per  =  Convert.ToDouble(e.ProgressPercentage)  /  Convert.ToDouble( 100 );
            loadBar.Height  =  (App.Current.Host.Content.ActualHeight  -   16 )  *  per;
        }

         void  webClient_OpenReadCompleted( object  sender, OpenReadCompletedEventArgs e)
        {
            Assembly assembly  =  LoadAssemblyFromXap(e.Result,  " showcase.dll " );
            UIElement element  =  assembly.CreateInstance( " showcase.Page " )  as  UIElement;
             this .LayoutRoot.Children.Clear();
             this .LayoutRoot.Children.Add(element);
        }

        Assembly LoadAssemblyFromXap(Stream packageStream, String assemblyName)
        {
            Stream stream  =  Application.GetResourceStream(
                     new  StreamResourceInfo(packageStream,  null ),
                     new  Uri( " AppManifest.xaml " , UriKind.Relative)).Stream;

            String appManifestString  =   new  StreamReader(stream).ReadToEnd();

            Deployment deployment  =  (Deployment)XamlReader.Load(appManifestString);

            Assembly assembly  =   null ;
             foreach  (AssemblyPart assemblyPart  in  deployment.Parts)
            {
                 if  (assemblyPart.Source  ==  assemblyName)
                {
                    String source  =  assemblyPart.Source;

                    StreamResourceInfo streamInfo  =  Application.GetResourceStream(
                         new  StreamResourceInfo(packageStream,
                         " application/binary " ),
                         new  Uri(source, UriKind.Relative));

                    assembly  =  assemblyPart.Load(streamInfo.Stream);
                     break ;
                }
            }
             return  assembly;
        }


         void  Content_FullScreenChanged( object  sender, EventArgs e)
        {
             this .ResizeFrame();
        }

         void  Content_Resized( object  sender, EventArgs e)
        {
             this .ResizeFrame();
        }

         void  ResizeFrame()
        {
            ( this   as  UserControl).Width  =  App.Current.Host.Content.ActualWidth;
            ( this   as  UserControl).Height  =  App.Current.Host.Content.ActualHeight;
        }

         void  FullScreenMode()
        {
            App.Current.Host.Content.IsFullScreen  =   ! App.Current.Host.Content.IsFullScreen;

        }
    }

 

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