Book with more than 5 video players

[Luis]

Hi there,
I have a simple book application where each page contains a video player (Framework Player). It works ok with 5 or less pages, but when the number of pages is more than 5, it drops (or unload) the excess pages in FIFO basis.
My question is: Is there any place to configure for more than 5 players?

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;
using Microsoft.SilverlightMediaFramework.Player;
using Microsoft.Web.Media.SmoothStreaming;
using Telerik.Windows.Controls;


namespace TestPlayer
{
    public partial class MainPage : UserControl
    {
        public MainPage()
        {
            InitializeComponent();
            int NumberOfPages = 5;
            setBook(NumberOfPages);

        }


        private void setBook(int numOfPages)
        {
            //same source for all players
            string BigBunny = "http://video3.smoothhd.com.edgesuite.net/ondemand/Big%20Buck%20Bunny%20Adaptive.ism/Manifest";
            //Create book
            RadBook myBook = new RadBook();
            myBook.Margin = new Thickness(10, 10, 10, 10);
            myBook.Width = LayoutRoot.Width;
            myBook.Height = LayoutRoot.Height;
            myBook.PageChanged += new Telerik.Windows.RadRoutedEventHandler(myBook_PageChanged);
            int pageNumber = 1;
            for (int i = 0; i < numOfPages; i++)
            {
                Grid myGrid = new Grid();

                TextBlock myText = new TextBlock();
                myText.Text = "Page " + pageNumber++.ToString();
                myText.HorizontalAlignment = HorizontalAlignment.Center;
                myText.VerticalAlignment = VerticalAlignment.Top;
                myGrid.Children.Add(myText);
                Player myPlayer = new Player();
                myPlayer.Name = "player_" + i.ToString();
                myPlayer.PlayControlClicked += new RoutedEventHandler(myPlayer_PlayControlClicked);
                myPlayer.Width = 600;
                myPlayer.Height = 400;
                myPlayer.Margin = new Thickness(10, 15, 10, 10);
                myPlayer.VerticalAlignment = VerticalAlignment.Top;
                CoreSmoothStreamingMediaElement myMediaElement = new CoreSmoothStreamingMediaElement();
                myMediaElement.AutoPlay = false;
                myMediaElement.SmoothStreamingSource = new Uri(BigBunny, UriKind.Absolute);
                myPlayer.MediaElement = myMediaElement;

                myGrid.Children.Add(myPlayer);
                myBook.Items.Add(myGrid);
            }


            //Add book to LayoutRoot
            LayoutRoot.Children.Add(myBook);
        }

        void myBook_PageChanged(object sender, Telerik.Windows.RadRoutedEventArgs e)
        {
            pausePlayers();
        }

        void myPlayer_PlayControlClicked(object sender, RoutedEventArgs e)
        {
            pausePlayers();
            Player myPlayer = (Player)sender;
            myPlayer.MediaElement.Play();
        }


        private void pausePlayers()
        {
            RadBook myBook = (RadBook)LayoutRoot.FindChildByType<RadBook>();
            for (int i = 0; i < myBook.Items.Count; i++)
            {
                Grid myGrid = (Grid)myBook.Items[i];
                Player myPlayer = (Player)myGrid.FindChildByType<Player>();
                myPlayer.MediaElement.Pause();
            }
        }


    }
}

The following is the code used.

[Kiril Stanoev]

Hi Luis,

Thank you for your feedback. Currently this scenario is not supported. For virtualization purposes, RadBook reuses its item containers thus the issue you experience. We have plans to introduce a property IsVirtualizing (similar to RadTreeView) that will allow you to define whether you want RadBook to reuse its item containers or not. We will do our best to provide this functionality for our 2010 Q2 release which is scheduled for the middle of July. I've logged this feature request in our PITS under the name "Book: Add IsVirtualizing property" and it will be available for tracking tomorrow the latest. Let me know if you have additional questions or comments regarding this topic.

All the best,
Kiril Stanoev
the Telerik team

Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Public Issue Tracking system and vote to affect the priority of the items.

[Luis]

Thanks for your support.

I downloaded the Q1 SP2, which according to the "What is New...";  the property IsVirtualizing for RadBook now is available, however I was not able to make it work. 

Please, can you show me how to use this property.

Thanks again, this property will allow me to create nice educational material.

[Tina Stancheva]

Hi Luis,

In order to see how the property works, you can generate a 1 000 000 items in the book and try setting the IsVirtualizing property to true and false. You will notice that when the IsVirtualizing property is set to false, the items cannot be properly displayed.

Give this a try and let us know if you need more info.

All the best,
Tina Stancheva
the Telerik team