private void _DrawFolderTopPlaceholders(TreeNode hoveredNode)
{
var treeView = hoveredNode.TreeView;
Contract.Assert(treeView != null, "Node must belong to a TreeView");
var g = treeView.CreateGraphics();
var nodeImage = hoveredNode.GetImage();
var imageWidth = nodeImage == null ? 0 : nodeImage.Size.Width + 8;
var leftPos = hoveredNode.Bounds.Left - imageWidth;
var rightPos = treeView.Width - 4;
var leftTriangle = new[] {
new Drawing.Point(leftPos, hoveredNode.Bounds.Top - 4),
new Drawing.Point(leftPos, hoveredNode.Bounds.Top + 4),
new Drawing.Point(leftPos + 4, hoveredNode.Bounds.Y),
new Drawing.Point(leftPos + 4, hoveredNode.Bounds.Top - 1),
new Drawing.Point(leftPos, hoveredNode.Bounds.Top - 5)
};
var rightTriangle = new[] {
new Drawing.Point(rightPos, hoveredNode.Bounds.Top - 4),
new Drawing.Point(rightPos, hoveredNode.Bounds.Top + 4),
new Drawing.Point(rightPos - 4, hoveredNode.Bounds.Y),
new Drawing.Point(rightPos - 4, hoveredNode.Bounds.Top - 1),
new Drawing.Point(rightPos, hoveredNode.Bounds.Top - 5)
};
g.FillPolygon(Brushes.Black, leftTriangle);
g.FillPolygon(Brushes.Black, rightTriangle);
g.DrawLine(new Pen(Color.Black, 2), new Drawing.Point(leftPos, hoveredNode.Bounds.Top), new Drawing.Point(rightPos, hoveredNode.Bounds.Top));
}
private void _DrawLeafBottomPlaceholders(TreeNode hoveredNode, TreeNode parentNodeDragDrop)
{
var treeView = hoveredNode.TreeView;
Contract.Assert(treeView != null, "Node must belong to a TreeView");
var g = treeView.CreateGraphics();
var nodeImage = hoveredNode.GetImage();
var imageWidth = nodeImage == null ? 0 : nodeImage.Size.Width + 8;
// Once again, we are not dragging to node over, draw the placeholder using the ParentDragDrop bounds
int leftPos, rightPos;
if (parentNodeDragDrop != null)
{
leftPos = parentNodeDragDrop.Bounds.Left - (parentNodeDragDrop.GetImage().Size.Width + 8);
}
else
{
leftPos = hoveredNode.Bounds.Left - imageWidth;
}
rightPos = treeView.Width - 4;
var leftTriangle = new[] {
new Drawing.Point(leftPos, hoveredNode.Bounds.Bottom - 4),
new Drawing.Point(leftPos, hoveredNode.Bounds.Bottom + 4),
new Drawing.Point(leftPos + 4, hoveredNode.Bounds.Bottom),
new Drawing.Point(leftPos + 4, hoveredNode.Bounds.Bottom - 1),
new Drawing.Point(leftPos, hoveredNode.Bounds.Bottom - 5)
};
var rightTriangle = new[] {
new Drawing.Point(rightPos, hoveredNode.Bounds.Bottom - 4),
new Drawing.Point(rightPos, hoveredNode.Bounds.Bottom + 4),
new Drawing.Point(rightPos - 4, hoveredNode.Bounds.Bottom),
new Drawing.Point(rightPos - 4, hoveredNode.Bounds.Bottom - 1),
new Drawing.Point(rightPos, hoveredNode.Bounds.Bottom - 5)
};
g.FillPolygon(Brushes.Black, leftTriangle);
g.FillPolygon(Brushes.Black, rightTriangle);
g.DrawLine(new Pen(Color.Black, 2), new Drawing.Point(leftPos, hoveredNode.Bounds.Bottom), new Drawing.Point(rightPos, hoveredNode.Bounds.Bottom));
}
/// <summary>
/// Gets called when the mouse moves with a dragged item.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void _DragOver(object sender, DragEventArgs e)
{
var treeView = sender as TreeView;
if (treeView == null || treeView != this._treeView)
{
return;
}
var currentScreenPoint = new Drawing.Point(e.X, e.Y);
// Compute drag position and move image
var form = treeView.FindForm();
if (form == null)
{
DragHelper.ImageList_DragShowNolock(false);
}
else
{
var tvP = treeView.GetLocationOnForm();
var formP = form.PointToClient(currentScreenPoint);
formP.Offset(-tvP.X, -tvP.Y);
DragHelper.ImageList_DragMove(formP.X, formP.Y);
}
var hoveredNode = treeView.GetNodeAt(treeView.PointToClient(currentScreenPoint));
if (hoveredNode == null)
{
return;
}
var draggedNode = this._draggedNode;
#region If hoveredNode is a child of the dragged node then cancel
if (hoveredNode.IsChildOf(draggedNode))
{
this.NodeMap = string.Empty;
return;
}
#endregion
// A bit long, but to summarize, process the following code only if the nodeover is null
// and either the nodeover is not the same thing as nodemoving UNLESSS nodeover happens
// to be the last node in the branch (so we can allow drag & drop below a parent branch)
if (hoveredNode == draggedNode && (hoveredNode.Parent == null || hoveredNode.Index != (hoveredNode.Parent.Nodes.Count - 1)))
{
return;
}
var offsetY = treeView.PointToClient(Cursor.Position).Y - hoveredNode.Bounds.Top;
this._ResetDraw();
if (!this._IsFolderNode(hoveredNode))
{
#region Standard Node
if (offsetY < (hoveredNode.Bounds.Height / 2))
{
//this.lblDebug.Text = "top";
#region Store the placeholder info into a pipe delimited string
this.SetNewNodeMap(hoveredNode, false);
if (this.SetMapsEqual())
{
return;
}
#endregion
this._SetAndDraw(PlaceHolderType.LeafTop, hoveredNode);
}
else
{
//this.lblDebug.Text = "bottom";
#region Allow drag drop to parent branches
TreeNode ParentDragDrop = null;
// If the node the mouse is over is the last node of the branch we should allow
// the ability to drop the "nodemoving" node BELOW the parent node
if (hoveredNode.Parent != null && hoveredNode.Index == (hoveredNode.Parent.Nodes.Count - 1))
{
var XPos = treeView.PointToClient(Cursor.Position).X;
if (XPos < hoveredNode.Bounds.Left)
{
ParentDragDrop = hoveredNode.Parent;
var image = ParentDragDrop.GetImage();
if (XPos < (ParentDragDrop.Bounds.Left - (image?.Size.Width ?? 0)))
{
if (ParentDragDrop.Parent != null)
{
ParentDragDrop = ParentDragDrop.Parent;
}
}
}
}
#endregion
#region Store the placeholder info into a pipe delimited string
// Since we are in a special case here, use the ParentDragDrop node as the current "nodeover"
this.SetNewNodeMap(ParentDragDrop ?? hoveredNode, true);
if (this.SetMapsEqual())
{
return;
}
#endregion
this._SetAndDraw(PlaceHolderType.LeafBottom, hoveredNode, ParentDragDrop);
}
#endregion
}
else
{
#region Folder Node
if (offsetY < (hoveredNode.Bounds.Height / 3))
{
//this.lblDebug.Text = "folder top";
#region Store the placeholder info into a pipe delimited string
this.SetNewNodeMap(hoveredNode, false);
if (this.SetMapsEqual())
{
return;
}
#endregion
this._SetAndDraw(PlaceHolderType.FolderTop, hoveredNode);
}
else if ((hoveredNode.Parent != null && hoveredNode.Index == 0) && (offsetY > (hoveredNode.Bounds.Height - (hoveredNode.Bounds.Height / 3))))
{
//this.lblDebug.Text = "folder bottom";
#region Store the placeholder info into a pipe delimited string
this.SetNewNodeMap(hoveredNode, true);
if (this.SetMapsEqual())
{
return;
}
#endregion
this._SetAndDraw(PlaceHolderType.FolderTop, hoveredNode);
}
else
{
//this.lblDebug.Text = "folder over";
if (hoveredNode.Nodes.Count > 0)
{
DragHelper.ImageList_DragShowNolock(false);
hoveredNode.Expand();
this._SetAndDraw(PlaceHolderType.AddToFolder, hoveredNode);
}
else
{
#region Prevent the node from being dragged onto itself
if (draggedNode == hoveredNode)
{
return;
}
#endregion
#region If hoveredNode is a child then cancel
if (hoveredNode.IsChildOf(draggedNode))
{
this.NodeMap = string.Empty;
return;
}
#endregion
#region Store the placeholder info into a pipe delimited string
this.SetNewNodeMap(hoveredNode, false);
this.NewNodeMap = this.NewNodeMap.Insert(this.NewNodeMap.Length, _NODEMAP_DELIMITER + "0");
if (this.SetMapsEqual())
{
return;
}
#endregion
this._SetAndDraw(PlaceHolderType.AddToFolder, hoveredNode);
}
}
#endregion
}
}
