/// <summary>
/// Create and initialize a new PublicationCanvas
/// </summary>
/// <param name="pubs">The publications to display on the screen</param>
/// <param name="height">The height of the canvas</param>
public PublicationCanvas(Publication[] pubs, double height) {
// map Image objects to Publications
publications = pubs.ToDictionary(
p => new Image() {
Source = p.CoverImage,
Height = height,
RenderTransform = new TranslateTransform(),
},
p => p
);
images = publications.Keys.ToArray();
positions = new double[images.Length];
// shift entire display 500px left
RenderTransform = new TranslateTransform() { X = RENDER_TRANSFORM };
// initially layout images
tileWidth = 0;
for (int i = 0; i < images.Length; i++) {
var image = images[i];
positions[i] = tileWidth;
Children.Add(image);
image.StylusSystemGesture += ImageTapped;
tileWidth += (int)((image.Height / image.Source.Height) * image.Source.Width);
}
// allow multitouch manipulation
IsManipulationEnabled = true;
ManipulationStarting += BeginManipulation;
ManipulationDelta += HandleManipulation;
ManipulationInertiaStarting += BeginInertia;
ManipulationCompleted += EndManipulation;
// register UI scroll at 60fps
timer = new DispatcherTimer {
Interval = TimeSpan.FromSeconds(1.0 / 60.0)
};
timer.Tick += delegate { ScrollImagesBy(RESTING_VELOCITY); };
Loaded += delegate { timer.Start(); };
}