private void CleanUpAfterDrag()
{
var window = Window.GetWindow(_MetroControl);
window.ClearValue(Window.AllowDropProperty);
window.DragEnter -= HandleDrag;
window.DragOver -= HandleDrag;
window.DragLeave -= HandleDrag;
window.Drop -= HandleDrop;
window.GiveFeedback -= HandleGiveFeedback;
VisualStateManager.GoToState(_DragTile, "IsNotDragSource", true);
if (_DragAdorner != null)
{
_DragAdorner.Detach();
}
if (_ScrollHelper != null)
{
_ScrollHelper.Stop();
}
_DragAdorner = null;
_DragSourcePage = null;
_DragTile = null;
_DragData = null;
_TileDropHelper = null;
_ScrollHelper = null;
_NewPageHelper = null;
}
private void PrepareForDrag()
{
var window = Window.GetWindow(_MetroControl);
window.AllowDrop = true;
window.DragEnter += HandleDrag;
window.DragOver += HandleDrag;
window.DragLeave += HandleDrag;
window.Drop += HandleDrop;
window.GiveFeedback += HandleGiveFeedback;
if (_MetroControlPanel == null)
{
_MetroControlPanel = _MetroControl.GetItemsHost();
}
VisualStateManager.GoToState(_DragTile, "IsDragSource", true);
_DragSourcePage = _DragTile.GetVisualParent <MetroStartPage>();
_DragData = _DragSourcePage != null?_DragSourcePage.ItemContainerGenerator.ItemFromContainer(_DragTile) : null;
var adornerTemplate = (DataTemplate)_MetroControl.FindResource(MetroControl.DragAdornerDataTemplateKey);
_DragAdorner = new TemplatedDragDropAdorner(_MetroControl, adornerTemplate, _DragData);
_AdornerOffset = _MetroControl.TranslatePoint(_MouseDownPosition, _DragTile);
_CenterOffset = new Point();
_CenterOffset.Offset((_DragTile.RenderSize.Width / 2) - _AdornerOffset.X, (_DragTile.RenderSize.Height / 2) - _AdornerOffset.Y);
_TileDropHelper = new TileDropHelper(this);
_ScrollHelper = new AutoScrollHelper(this);
if (CanCreateNewPages())
{
_NewPageHelper = new DragTileIntoNewPageHelper(this);
}
}
