private void OnDrop(object sender, DragEventArgs e)
{
TreeViewExItem item = GetTreeViewItemUnderMouse(e.GetPosition(TreeView));
if (item == null)
{
CleanUpAdorners();
return;
}
CanInsertReturn canInsertReturn = CanInsert(item, e.GetPosition, e.Data);
if (canInsertReturn != null)
{
// insert and return
item.ParentTreeViewItem.Insert(canInsertReturn.Index, e.Data.GetData(canInsertReturn.Format));
CleanUpAdorners();
return;
}
// check if drop is possible
string dropformat = CanDrop(item, e.Data);
if (dropformat != null)
{
// drop and return
object data = e.Data.GetData(dropformat);
item.DropAction(data);
}
CleanUpAdorners();
}
private void OnDrop(object sender, DragEventArgs e)
{
TreeViewExItem item = GetTreeViewItemUnderMouse(e.GetPosition(TreeView));
//if (item == null)
//{
// CleanUpAdorners();
// return;
//}
CanInsertReturn canInsertReturn = CanInsert(item, e.GetPosition, e.Data);
if (canInsertReturn != null)
{
// insert and return
TreeView.DropCommand.Execute(new DropParameters(item.ParentTreeViewItem, e.Data, canInsertReturn.Index));
CleanUpAdorners();
return;
}
// check if drop is possible
if (CanDrop(item, e.Data))
{
// drop and return
TreeView.DropCommand.Execute(new DropParameters(item, e.Data));
}
CleanUpAdorners();
}
void OnDragOver(object sender, DragEventArgs e)
{
// drag over is the only event which returns the position
// GiveFeedback returns nonsense even from Mouse.GetPosition
Point point = e.GetPosition(TreeView);
if (TryScroll(point))
{
return;
}
if (dragAdorner == null)//external drop
{
var content = new DragContent();
content.Add(e.Data);
dragAdorner = new DragAdorner(TreeView, content);
}
dragAdorner.UpdatePosition(point);
if (IsMouseOverAdorner(point))
{
return;
}
var itemsPresenter = TreeView.ScrollViewer.Content as ItemsPresenter;
if (itemsPresenter.InputHitTest(e.GetPosition(itemsPresenter)) == null)
{
dragAdorner.Content.CanDrop = false;
dragAdorner.Content.CanInsert = false;
//dragAdorner.Content.InsertIndex = -1;
if (insertAdorner != null)
{
insertAdorner.Dispose();
}
return;
}
if (itemMouseIsOver != null)
{
itemMouseIsOver.IsCurrentDropTarget = false;
}
itemMouseIsOver = GetTreeViewItemUnderMouse(point);
if (itemMouseIsOver == null)
{
return;
}
CanInsertReturn canInsertReturn = CanInsert(itemMouseIsOver, e.GetPosition, e.Data);
if (canInsertReturn != null)
{
dragAdorner.Content.CanDrop = false;
dragAdorner.Content.CanInsert = true;
//dragAdorner.Content.InsertIndex = canInsertReturn.Index;
if (insertAdorner == null)
{
insertAdorner = new InsertAdorner(itemMouseIsOver, new InsertContent {
Before = canInsertReturn.Before
});
}
else
{
insertAdorner.Dispose();
insertAdorner = new InsertAdorner(itemMouseIsOver, new InsertContent {
Before = canInsertReturn.Before
});
}
itemMouseIsOver.IsCurrentDropTarget = false;
}
else
{
dragAdorner.Content.CanInsert = false;
//dragAdorner.Content.InsertIndex = -1;
if (insertAdorner != null)
{
insertAdorner.Dispose();
insertAdorner = null;
}
dragAdorner.Content.CanDrop = CanDrop(itemMouseIsOver, e.Data) != null;
if (itemMouseIsOver != null)
{
itemMouseIsOver.IsCurrentDropTarget = true;
}
}
}
void OnDragOver(object sender, DragEventArgs e)
{
e.Effects = DragDropEffects.None;
e.Handled = true;
// drag over is the only event which returns the position
Point point = e.GetPosition(TreeView);
if (TryScroll(point))
{
return;
}
if (IsMouseOverAdorner(point))
{
return;
}
var itemsPresenter = TreeView.ScrollViewer.Content as ItemsPresenter;
/*
* if (itemsPresenter.InputHitTest(e.GetPosition(itemsPresenter)) == null)
* {
* if (insertAdorner != null) insertAdorner.Dispose();
* return;
* }
*/
if (itemMouseIsOver != null)
{
itemMouseIsOver.IsCurrentDropTarget = false;
}
itemMouseIsOver = GetTreeViewItemUnderMouse(point);
//if (itemMouseIsOver == null) return;
CanInsertReturn canInsertReturn = CanInsert(itemMouseIsOver, e.GetPosition, e.Data);
if (canInsertReturn != null)
{
e.Effects = DragDropEffects.Move;
if (insertAdorner == null)
{
insertAdorner = new InsertAdorner(itemMouseIsOver, new InsertContent {
Before = canInsertReturn.Before
});
}
else
{
insertAdorner.Dispose();
insertAdorner = new InsertAdorner(itemMouseIsOver, new InsertContent {
Before = canInsertReturn.Before
});
}
itemMouseIsOver.IsCurrentDropTarget = false;
}
else
{
if (insertAdorner != null)
{
insertAdorner.Dispose();
insertAdorner = null;
}
if (CanDrop(itemMouseIsOver, e.Data))
{
e.Effects = DragDropEffects.Move;
}
if (itemMouseIsOver != null)
{
itemMouseIsOver.IsCurrentDropTarget = true;
}
}
}