private double GetItemHeight(ViewModelBase viewModel)
{
var ai = new AgendaItemControl();
ai.Width = ItemsHost.ActualWidth;
ai.DataContext = viewModel;
ai.Measure(new Size(int.MaxValue, int.MaxValue));
return(ai.DesiredSize.Height);
}
private void LoadItems(List <ViewModelBase> items)
{
StopAnimation();
// #1 Hide old items
if (ItemsHost.Children.Count > 0)
{
_oldItems = ItemsHost.Children.ToList();
for (int i = 0; i < ItemsHost.Children.Count; i++)
{
var oldItem = ItemsHost.Children[i] as FrameworkElement;
_transitionStoryboard.Children.Add(RotateItem(oldItem, i * (_duration / 2), 0, 90, EasingMode.EaseIn));
}
}
double topOffset = 0;
// #2 Show new items
for (int i = 0; i < items.Count; i++)
{
var ai = new AgendaItemControl();
ai.DataContext = items[i];
ai.Width = ItemsHost.ActualWidth;
ai.Projection = new PlaneProjection()
{
RotationX = -90
};
Canvas.SetTop(ai, topOffset);
double height = GetItemHeight(items[i]);
// Item is too big, cut it off.
if (height > LayoutRoot.ActualHeight)
{
ai.Height = LayoutRoot.ActualHeight;
}
ItemsHost.Children.Add(ai);
// Calculate next item offset.
_transitionStoryboard.Children.Add(RotateItem(ai, (i + 1) * (_duration / 2), -90, 0, EasingMode.EaseIn));
topOffset += height;
}
_transitionStoryboard.Begin();
}
