protected override void OnDragOver(DragEventArgs e)
{
base.OnDragEnter(e);
HitTestResult result = VisualTreeHelper.HitTest(this, e.GetPosition(this));
if ((result.VisualHit as UIElement).IsDescendantOf(this))
{
UIElement element = (result.VisualHit as UIElement);
DragDropTreeViewItem targetNode = GetNearestContainer(e.Source as UIElement);
if (e.GetPosition(targetNode).Y < targetNode.ActualHeight * 0.2f)
{
// meter em cima
//Console.WriteLine("cima");
DragDropHelper.insertionPlace = DragDropHelper.InsertionPlace.Top;
DragDropHelper.CreateInsertionAdorner(targetNode, true);
}
else if (e.GetPosition(targetNode).Y > targetNode.ActualHeight * 0.8f)
{
//Console.WriteLine("baixo");
DragDropHelper.insertionPlace = DragDropHelper.InsertionPlace.Bottom;
DragDropHelper.CreateInsertionAdorner(targetNode, false);
}
else
{
//Console.WriteLine("centro");
DragDropHelper.RemoveInsertionAdorner();
DragDropHelper.insertionPlace = DragDropHelper.InsertionPlace.Center;
var converter = new System.Windows.Media.BrushConverter();
Background = (Brush)converter.ConvertFromString("#555");
}
}
}
protected override void OnMouseMove(MouseEventArgs e)
{
base.OnMouseMove(e);
HitTestResult result = VisualTreeHelper.HitTest(this, e.GetPosition(this));
// Move the dragged node when the left mouse button is used. EditorUtils.GetParent(result.VisualHit, 2) ==
if (e.LeftButton == MouseButtonState.Pressed && CanDrag && (result.VisualHit as UIElement) != null && (result.VisualHit as UIElement).IsDescendantOf(this))
{
try
{
DragDrop.DoDragDrop(this, this, DragDropEffects.Move);
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
}
DragDropTreeViewItem targetNode = GetNearestContainer(e.Source as UIElement);
if (targetNode == null)
{
DragDropHelper.RemoveInsertionAdorner();
}
//Console.WriteLine(this.PointFromScreen(Mouse.GetPosition(targetNode)));
}
protected override void OnDragLeave(DragEventArgs e)
{
base.OnDragLeave(e);
Background = Brushes.Transparent;
DragDropHelper.RemoveInsertionAdorner();
}
protected override void OnDrop(DragEventArgs e)
{
base.OnDrop(e);
// Retrieve the client coordinates of the drop location.
Point targetPoint = e.GetPosition(this);
try
{
// Retrieve the node at the drop location.
DragDropTreeViewItem targetNode = GetNearestContainer(e.Source as UIElement);
DragDropHelper.RemoveInsertionAdorner();
// Retrieve the node that was dragged.
DragDropTreeViewItem draggedNode = (DragDropTreeViewItem)e.Data.GetData(typeof(DragDropTreeViewItem));
if (draggedNode == null)
{
draggedNode = (DragDropTreeViewItem)e.Data.GetData(typeof(ExplorerTreeViewItem));
}
if (targetNode == null || draggedNode == null)
{
return;
}
// Confirm that the node at the drop location is not
// the dragged node or a descendant of the dragged node.
if (!draggedNode.Equals(targetNode) && !ContainsNode(draggedNode, targetNode))
{
CancelEventArgs evt = new CancelEventArgs();
OnDragDropSuccess(draggedNode, targetNode, evt);
if (!evt.Cancel)
{
// If it is a move operation, remove the node from its current
// location and add it to the node at the drop location.
if (e.Effects == DragDropEffects.Move)
{
List <TreeViewItem> items = TreeViewExtension.GetSelectedTreeViewItems(TreeViewExtension.GetTree(targetNode));
if (items != null && items.Count > 0)
{
// multi selection drag:
foreach (var ti in items)
{
(ti.Parent as ItemsControl).Items.Remove(ti);
if (DragDropHelper.insertionPlace == DragDropHelper.InsertionPlace.Center)
{
targetNode.Items.Add(ti);
}
else
{
int index = (targetNode.Parent as ItemsControl).ItemContainerGenerator.IndexFromContainer(targetNode);
if (index < 0)
{
index = 0;
}
if (DragDropHelper.insertionPlace == DragDropHelper.InsertionPlace.Bottom)
{
index++;
}
(targetNode.Parent as ItemsControl).Items.Insert(index, ti);
}
ti.IsSelected = true;
ReApplyStyle(ti as DragDropTreeViewItem, "IgniteMultiTreeViewItem");
}
}
else
{
(draggedNode.Parent as ItemsControl).Items.Remove(draggedNode);
if (DragDropHelper.insertionPlace == DragDropHelper.InsertionPlace.Center)
{
targetNode.Items.Add(draggedNode);
}
else
{
int index = (targetNode.Parent as ItemsControl).ItemContainerGenerator.IndexFromContainer(targetNode);
if (index < 0)
{
index = 0;
}
if (DragDropHelper.insertionPlace == DragDropHelper.InsertionPlace.Bottom)
{
index++;
}
(targetNode.Parent as ItemsControl).Items.Insert(index, draggedNode);
}
draggedNode.IsSelected = true;
ReApplyStyle(draggedNode, "IgniteTreeViewItem");
}
}
// OPTIONAL:
// If it is a copy operation, clone the dragged node
// and add it to the node at the drop location.
//else if (e.Effects == DragDropEffects.Copy)
//{
// targetNode.Items.Add((DragDropTreeViewItem)draggedNode);
//}
// Expand the node at the location
// to show the dropped node.
targetNode.IsExpanded = true;
}
}
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
}