private void tlMainTabs_TabPointerEntered(object sender, Windows.UI.Xaml.Input.PointerRoutedEventArgs e)
{
TabViewModel tvm = null;
if (sender is FrameworkElement)
{
var fe = (FrameworkElement)sender;
if (fe.DataContext is TabViewModel)
{
tvm = (TabViewModel)fe.DataContext;
}
else
{
return;
}
var visual = fe.TransformToVisual(layoutRoot);
var point1 = visual.TransformPoint(new Point(0, 0));
var point2 = new Point(point1.X + fe.ActualWidth + 180, point1.Y + fe.ActualHeight + 140);
//hide all the current tabs in the canvas
_spriteBatch.Elements.ToList().ForEach(delegate(IVisualTreeElement element) { element.IsVisible = false; });
//now delete all the relevant elements in the spritebatch
_spriteBatch.DeleteAll();
//create the new thumbnail sprite for current button
_spriteBatch.Add(new TabThumbnailSprite()
{
Layout = new Rect(point1, point2), ID = const_TabPreview, TextureBackgroundUri = tvm.ThumbUri, IsVisible = true
});
_spriteBatch.IsVisible = true;
}
CanvasInvalidate();
}