Autoscroll ListBox in XNA/Silverlight

Autoscroll ListBox in XNA/Silverlight

I want to do the credits screen for a game, but the credits consists in a series of images. I could not find a container that allowed me to insert multiple images and scroll them, so I created a ListBox with buttons in it. These buttons have only an image and are not clickable, so they act like just images. As far as putting the images in a container that allows me to scroll it, is already covered. The problem comes when I want them to autoscroll, I found around the web a series of autoscrolling a ListBox but nothing seem to fit into what I want to do.

Here is what i have:

Global variables for this class

    GameTimer _timer = null;     int _currentIdx = 0;     int _elapsedTime;     const int TIMER_DELAY_IN_MILLIS = 1000; 

When the application navigates into this page:

    protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)     {         _elapsedTime = 0;         _timer = new GameTimer();         _timer.UpdateInterval = TimeSpan.FromTicks(333333);         _timer.Update += OnUpdate;         _timer.Start();          base.OnNavigatedTo(e);     } 

When the application updates:

    private void OnUpdate(object sender, GameTimerEventArgs e)     {         if (_elapsedTime > TIMER_DELAY_IN_MILLIS)         {             _elapsedTime -= TIMER_DELAY_IN_MILLIS;             Credits.UpdateLayout();             Credits.ScrollIntoView(Credits.Items[_currentIdx]);             System.Diagnostics.Debug.WriteLine("" + _currentIdx + " Update: " + e.ElapsedTime);              _currentIdx = ++_currentIdx % Credits.Items.Count;         }         _elapsedTime += e.ElapsedTime.Milliseconds;     } 

As you can see, I do something like an update for this class and based on that the listbox scrolls to the button (view) that is in the next index of the list, however the scrolling I am trying to get is a smoother and more movie-like. I do not know if I am using the right container or if there is something bad with my algorithm, any kind of help would be very appreciated [:

Answers & Comments...

Answer: 1

Try using the ScrollToVerticalOffset method instead. This allows you to scroll with pixel-precision.

by : ColinEhttp://stackoverflow.com/users/249933

Answer: 2

This article has some examples of how to animate scrolling in a ScrollViewer. Choose a good timespan for the length of your credits and animate the VerticalOffset to the end.

by : A-Typehttp://stackoverflow.com/users/700143

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