//will restore the scatterviewitem to visible when the user drops the item where it is not able
//to be dropped
private void Scatter_DragCanceled(object sender, SurfaceDragDropEventArgs e)
{
PhotoData data = e.Cursor.Data as PhotoData;
ScatterViewItem svi = scatter.ItemContainerGenerator.ContainerFromItem(data) as ScatterViewItem;
if (svi != null)
{
svi.Visibility = Visibility.Visible;
}
}
/// Will be used when the user touches an element on the scatterview
/// will gather the required data for the drag and drop operation and start it
/// Once user has dropped item, either a DragCanceled or DragCompleted event will be fired,
/// depending on where the item is dropped
/// If they drop the item on the ScatterView or LibraryContainer the DragCompleted Event will fire
/// If they drop it to the left of the right of the LibraryContainer the DragCanceled event will fire
private void Scatter_PreviewTouchDown(object sender, TouchEventArgs e)
{
FrameworkElement findSource = e.OriginalSource as FrameworkElement;
ScatterViewItem draggedElement = null;
//find the ScatterViewItem object that is being touched
while (draggedElement == null && findSource != null)
{
if ((draggedElement = findSource as ScatterViewItem) == null)
{
findSource = VisualTreeHelper.GetParent(findSource) as FrameworkElement;
}
}
if (draggedElement == null)
{
return;
}
PhotoData data = draggedElement.Content as PhotoData;
//create the cursor visual
ContentControl cursorVisual = new ContentControl()
{
Content= draggedElement.DataContext,
Style = FindResource("CursorStyle") as Style
};
//create the list of input devices
//add the touches that are currently captured within the dragged elt and
//the current touch (if it isn't already in the list)
List<InputDevice> devices = new List<InputDevice>();
devices.Add(e.TouchDevice);
foreach (TouchDevice touch in draggedElement.TouchesCapturedWithin)
{
if (touch != e.TouchDevice)
{
devices.Add(touch);
}
}
//get the drag source object
ItemsControl dragSource = ItemsControl.ItemsControlFromItemContainer(draggedElement);
//the scatterview object that the cursor is dragged out from
SurfaceDragDrop.BeginDragDrop(
dragSource,
draggedElement,
cursorVisual,
draggedElement.DataContext,
devices,
DragDropEffects.Move);
//this prevents the default touch operator from happening
e.Handled = true;
//hide the scatterviewitem for now. we will remove it if the dragdrop is successful
draggedElement.Visibility = Visibility.Hidden;
}
///Allows you to drag items from the LibraryContainer to the ScatterView and drop them
private void Scatter_Drop(object sender, SurfaceDragDropEventArgs e)
{
PhotoData e1 = (PhotoData)e.Cursor.Data;
//if it isn't already on the Scatterview, add it to the source collection
if (!ScatterItems.Contains(e.Cursor.Data))
{
e1 = (PhotoData)e.Cursor.Data;
ScatterItems.Add(e1);
}
//get the ScatterViewItem that Scatter automatically generated.
ScatterViewItem svi = scatter.ItemContainerGenerator.ContainerFromItem(e.Cursor.Data) as ScatterViewItem;
svi.Visibility = System.Windows.Visibility.Visible;
svi.Width = e.Cursor.Visual.ActualWidth;
svi.Height = e.Cursor.Visual.ActualHeight;
svi.Center = e.Cursor.GetPosition(scatter);
svi.Orientation = e.Cursor.GetOrientation(scatter);
svi.Background = Brushes.Transparent;
//setting e.handled to true ensures that default behavior is not performed
e.Handled = true;
}
