private void RemoveAdorner()
{
if (this.adorner != null)
{
AdornerLayer.GetAdornerLayer(this.sourceBox).Remove(adorner);
this.adorner = null;
}
}
private void ShowAdorner(DragEventArgs e)
{
if (adorner == null)
{
adorner = new DragAdorner(this.sourceItem, this.startPoint);
AdornerLayer.GetAdornerLayer(this.sourceBox).Add(adorner);
}
adorner.UpdatePosition(e.GetPosition(this.topWindow));
}
private void StartDragInProcAdorner(MouseEventArgs e)
{
// Let's define our DragScope .. In this case it is every thing inside our main window ..
DragScope = Program.MainWindow.Content as FrameworkElement;
Debug.Assert(DragScope != null);
// We enable Drag & Drop in our scope ... We are not implementing Drop, so it is OK, but this allows us to get DragOver
bool previousDrop = DragScope != null && DragScope.AllowDrop;
if (DragScope != null) DragScope.AllowDrop = true;
// Let's wire our usual events..
// GiveFeedback just tells it to use no standard cursors..
GiveFeedbackEventHandler feedbackhandler = DragSourceGiveFeedback;
GiveFeedback += feedbackhandler;
// The DragOver event ...
DragEventHandler draghandler = Window1DragOver;
DragScope.PreviewDragOver += draghandler;
// Drag Leave is optional, but write up explains why I like it ..
DragEventHandler dragleavehandler = DragScopeDragLeave;
DragScope.DragLeave += dragleavehandler;
// QueryContinue Drag goes with drag leave...
QueryContinueDragEventHandler queryhandler = DragScopeQueryContinueDrag;
DragScope.QueryContinueDrag += queryhandler;
//Here we create our adorner..
_adorner = new DragAdorner(DragScope, this, true, 0.5);
_layer = AdornerLayer.GetAdornerLayer(DragScope);
_layer.Add(_adorner);
IsDragging = true;
_dragHasLeftScope = false;
//Finally lets drag drop
//var data = new DataObject(DataFormats.Text, "abcd");
//DragDropEffects de = DragDrop.DoDragDrop(this, data, DragDropEffects.Move);
// Clean up our mess :)
DragScope.AllowDrop = previousDrop;
AdornerLayer.GetAdornerLayer(DragScope).Remove(_adorner);
_adorner = null;
GiveFeedback -= feedbackhandler;
DragScope.DragLeave -= dragleavehandler;
DragScope.QueryContinueDrag -= queryhandler;
DragScope.PreviewDragOver -= draghandler;
IsDragging = false;
}