教你打造Silverlight超酷翻页实例(三)

4 、设置应用程序控制逻辑

 

详细的说明请见代码注释。

1 ）MainPage.xaml.cs 文件代码 ：  

Code
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
using System.Threading;
using SLMitsuControls;

namespace SilverlightClient
{
    public partial class MainPage : UserControl, IDataProvider
    {
        //定义全局变量
        private List<object> PageObjectList;//页面对象列表
        public enum PageType { right, left };//页面类型
        public string fileMedia = "";//文件媒体
        public string headerPage = "";//首页
        public int maxiPageNum = 0;//最大页数
        public enum Location { local, web };//枚举应用程序所在
        public Location modeLocation;
        private int pageDownload = 0;//下载的页面数
        private string uriResources = "";//Uri地址

        //构造函数
        public MainPage()
        {
            InitializeComponent();
            PageObjectList = new List<object>();
        }

        //UserControl事件触发处理
        private void UserControl_Loaded(object sender, RoutedEventArgs e)
        {
            if (modeLocation == Location.local)
            {
                this.canvChanging.Visibility = Visibility.Collapsed;
                this.canvasBook.Visibility = Visibility.Visible;
                //填充页面列表
                FillPagesList();
            }
            if (modeLocation == Location.web)
            {
                this.canvChanging.Visibility = Visibility.Visible;
                this.canvasBook.Visibility = Visibility.Collapsed;
                //开始下载页面
                DownloadPages();
            }
        }

        //开始将页面填充至List中
        private void FillPagesList()
        {
            //用页面填充列表
            for (int xx = 1; xx <= maxiPageNum; xx++)
            {
                if (xx % 2 != 0)
                {
                    //前一页即奇数页
                    AddPageToList(PageType.right, fileMedia + "/" + headerPage +
                        xx.ToString("00") + ".jpg", xx.ToString(),
                      maxiPageNum.ToString(), true);
                }
                else
                {
                    //后一页即偶数页
                    AddPageToList(PageType.left, fileMedia + "/" + headerPage +
                        xx.ToString("00") + ".jpg", xx.ToString(),
                      maxiPageNum.ToString(), true);
                }
            }

            //移除最后一页的按钮
            TypePage.RightPage page = PageObjectList[maxiPageNum - 1] as TypePage.RightPage;
            page.setterDisplayBtnNext(false);

            //为翻页按钮指派事件触发处理
            for (int xx = 1; xx < maxiPageNum; xx++)
            {
                if (xx % 2 != 0)
                {
                    //前一页即奇数页
                    TypePage.RightPage pp = PageObjectList[xx - 1] as TypePage.RightPage;
                    Button btnNext = pp.getbtnNext();
                    btnNext.Click += new RoutedEventHandler(btnNext_Click);
                }
                else
                {
                    //后一页即偶数页
                    TypePage.LeftPage pp = PageObjectList[xx - 1] as TypePage.LeftPage;
                    Button btnPrevious = pp.getbtnPrevious();
                    btnPrevious.Click += new RoutedEventHandler(btnPrevious_Click);
                }
            }

            //为Book设置数据内容
            book.SetData(this);
        }

        //向页面列表中添加具体页面
        private void AddPageToList(PageType pageType, string pathImage,
            string numPage, string numMaxiPage,
          bool showBtnYesNo)
        {
            switch (pageType)
            {
                case PageType.right:
                    TypePage.RightPage pcd = new SilverlightClient.TypePage.RightPage();
                    pcd.setterimgPhoto(pathImage);
                    pcd.setterPageNumber(numPage, numMaxiPage);
                    pcd.setterDisplayBtnNext(showBtnYesNo);
                    PageObjectList.Add(pcd);
                    break;
                case PageType.left:
                    TypePage.LeftPage pcg = new SilverlightClient.TypePage.LeftPage();
                    pcg.setterimgPhoto(pathImage);
                    pcg.setterPageNumber(numPage, numMaxiPage);
                    pcg.setterDisplayBtnPrevious(showBtnYesNo);
                    PageObjectList.Add(pcg);
                    break;
            }
        }

        //“下一页”按钮事件触发处理
        private void btnNext_Click(object sender, RoutedEventArgs e)
        {
            book.AnimateToNextPage(500);
        }

        //“上一页”按钮事件触发处理
        private void btnPrevious_Click(object sender, RoutedEventArgs e)
        {
            book.AnimateToPreviousPage(500);
        }

        //从网络上下载页面
        private void DownloadPages()
        {
            this.canvChanging.Visibility = Visibility.Visible;
            this.uriResources = Application.Current.Host.Source.AbsoluteUri;
            int index = uriResources.IndexOf("SilverlightClient.xap");
            uriResources = uriResources.Substring(0, index);
            this.changingProgressBar.Minimum = 0;
            this.changingProgressBar.Maximum = maxiPageNum - 1;
            string theResources = uriResources + fileMedia + "/" + headerPage + 
                (pageDownload + 1).ToString("00") + ".jpg";
            string theResourcesNum = headerPage + (pageDownload + 1).ToString("00") + ".jpg";
            AsynchronouslyDownloadPage(theResources, theResourcesNum);
        }

        //异步下载页面
        private void AsynchronouslyDownloadPage(string path, string num)
        {
            WebClient unWeb = new WebClient();
            unWeb.DownloadStringCompleted += 
               new DownloadStringCompletedEventHandler(unWeb_DownloadStringCompleted);
            unWeb.DownloadStringAsync(new Uri(path));
            this.changingText.Text = "正在下载 : " + num;
            this.changingProgressBar.Value = this.pageDownload;
        }

        //异步下载页面完成事件触发处理
        private void unWeb_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
        {
            this.pageDownload++;
            if (this.pageDownload < this.maxiPageNum)//持续不断下载页面直到所有页面都下完
            {
                string theResources = uriResources + fileMedia + "/" + headerPage +
                  (pageDownload + 1).ToString("00") + ".jpg";
                string theResourcesNum = headerPage + (pageDownload + 1).ToString("00") + ".jpg";
                AsynchronouslyDownloadPage(theResources, theResourcesNum);
            }
            else
            {
                FillPagesList();
                this.canvChanging.Visibility = Visibility.Collapsed;
                this.canvasBook.Visibility = Visibility.Visible;
            }
        }

        //强制声明接口
        #region IDataProvider Members
        public object GetItem(int index)
        {
            return PageObjectList[index];
        }
        public int GetCount()
        {
            return PageObjectList.Count;
        }
        #endregion

    }
}

 

2 ）App.xaml.cs 文件代码 ：  

Code
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

namespace SilverlightClient
{
    public partial class App : Application
    {
        public string gFileMedia = "";
        public string gHeaderPage = "";
        public int gPageNumber = 0;
        public string gModeLocation = "";
        
        public App()
        {
            this.Startup += this.Application_Startup;
            this.Exit += this.Application_Exit;
            this.UnhandledException += this.Application_UnhandledException;

            InitializeComponent();
        }

        private void Application_Startup(object sender, StartupEventArgs e)
        {
            int paramOk = 0;
            //从HTML中取出初始化数据
            if (e.InitParams.ContainsKey("gFile"))
            {
                gFileMedia = e.InitParams["gFile"];
                paramOk++;
            }
            if (e.InitParams.ContainsKey("gHeaderPage"))
            {
                gHeaderPage = e.InitParams["gHeaderPage"];
                paramOk++;
            }
            if (e.InitParams.ContainsKey("gNum"))
            {
                string recup = e.InitParams["gNum"];
                gPageNumber = int.Parse(recup);
                paramOk++;
            }
            if (e.InitParams.ContainsKey("gLocation"))
            {
                gModeLocation = e.InitParams["gLocation"];
                paramOk++;
            }
            if (paramOk == 4)
            {
                //初始化MainPage
                MainPage maPage = new MainPage();
                maPage.fileMedia = gFileMedia;
                maPage.headerPage = gHeaderPage;
                maPage.maxiPageNum = gPageNumber;
                if (gModeLocation.CompareTo("local") == 0)
                {
                    maPage.modeLocation = MainPage.Location.local;
                }
                if (gModeLocation.CompareTo("web") == 0)
                {
                    maPage.modeLocation = MainPage.Location.web;
                }
                this.RootVisual = maPage;
            }
        }

        private void Application_Exit(object sender, EventArgs e)
        {
            
        }

        private void Application_UnhandledException(object sender, 
            ApplicationUnhandledExceptionEventArgs e)
        {
            if (!System.Diagnostics.Debugger.IsAttached)
            {
                e.Handled = true;
                Deployment.Current.Dispatcher.BeginInvoke(delegate { ReportErrorToDOM(e); });
            }
        }
        private void ReportErrorToDOM(ApplicationUnhandledExceptionEventArgs e)
        {
            try
            {
                string errorMsg = e.ExceptionObject.Message + e.ExceptionObject.StackTrace;
                errorMsg = errorMsg.Replace('"', '\'').Replace("\r\n", @"\n");

                System.Windows.Browser.HtmlPage.Window.Eval(
                   "throw new Error(\"Unhandled Error in Silverlight Application " + errorMsg + "\");");
            }
            catch (Exception)
            {
            }
        }
    }
}

 

 

3 ） 在 SilverlightClientTestPage.aspx 文件（位于工程 FlipPage 文件夹下）中，添加用绿色粗体标明的代码：

 

< body >

    <form id="form1" runat="server" style="height:100%">

    <div id="silverlightControlHost">

        <object data="data:application/x-silverlight-2," type="application/x-silverlight-2"
          width="100%" height="100%">

          <param name="source" value="ClientBin/SilverlightClient.xap"/>

          <param name="onError" value="onSilverlightError" />

          <param name="background" value="white" />

          <param name="minRuntimeVersion" value="3.0.40624.0" />

          <param name="autoUpgrade" value="true" />

          <!-- 设置Book初始化参数-->

          <param name="initParams" value="gFile=mediaPictures, gHeaderPage=albumPictures, gNum=9, gLocation=web" />

          <a href="http://go.microsoft.com/fwlink/?LinkID=149156&v=3.0.40624.0"
           style="text-decoration:none">

              <img src="http://go.microsoft.com/fwlink/?LinkId=108181"
               alt="Get Microsoft Silverlight" style="border-style:none"/>

          </a>

        </object><iframe id="_sl_historyFrame" 
          style="visibility:hidden;height:0px;width:0px;border:0px"></iframe></div>

    </form>

</ body >

5 、最终效果图