protected override void OnDragOver(DragEventArgs e)
{
var currentPosition = e.GetPosition(WorkspaceElements);
// create adorner if it is necessary
if (draggedAdorner == null)
{
var adornerLayer = AdornerLayer.GetAdornerLayer(WorkspaceElements);
draggedAdorner = new DraggedAdorner(draggedData,
draggedSelectionTemplate, WorkspaceElements, adornerLayer);
}
var zoom = ViewModel.Zoom;
var xOffset = currentPosition.X - initialMousePosition.X;
var yOffset = currentPosition.Y - initialMousePosition.Y;
// compute (x; y) so that dragged selection has mouse cursor
// in the same place as origin selection does
var x = xOffset * zoom;
var y = yOffset * zoom;
// compute bounds of dragged content so that it does not go outside dragged canvas
var x1 = -ViewModel.Model.X / zoom - xOffset;
var y1 = -ViewModel.Model.Y / zoom - yOffset;
var x2 = WorkspaceElements.RenderSize.Width / zoom;
var y2 = WorkspaceElements.RenderSize.Height / zoom;
var bounds = new Rect(x1, y1, x2, y2);
draggedAdorner.SetPosition(x, y, bounds);
}
public void UpdateDragDrop(DragEventArgs e)
{
object draggedData = e.Data.GetData(Format.Name);
if (draggedData != null)
{
Point currentPosition = e.GetPosition(_topWindow);
if (_draggedAdorner == null)
{
var adornerLayer = AdornerLayer.GetAdornerLayer(_source);
_draggedAdorner = new DraggedAdorner(draggedData, ItemsControlBehaviors.GetDragDropTemplate(_source), _sourceItemContainer, adornerLayer);
}
_draggedAdorner.SetPosition(currentPosition.X - _initialMousePosition.X + _initialMouseOffset.X, currentPosition.Y - _initialMousePosition.Y + _initialMouseOffset.Y);
}
}
private void UpdateDraggedAdornerPos(Point currentPosition, bool makeVisible = false)
{
if (_draggedAdorner == null)
{
return;
}
var x = currentPosition.X - OriginalOffset.X;
var y = currentPosition.Y - OriginalOffset.Y;
_draggedAdorner.SetPosition(x, y);
if (makeVisible)
{
ShowDraggedAdorner();
}
}