private void FillOurTreeView()
{
#region Old way
//TreeViewNode t1 = new TreeViewNode("test1");
//treeViewControl1.Root.Children.Add(t1);
//TreeViewNode t11 = new TreeViewNode("subtest11");
//t1.VMembers.Children.Add(t11);
//TreeViewNode t12 = new TreeViewNode("subtest12");
//t1.VMembers.Children.Add(t12);
//TreeViewNode t2 = new TreeViewNode("test2");
//treeViewControl1.Root.Children.Add(t2);
//t2.MyNodeControl.TreeLineStyle = RedLineStyle;
//TreeViewNode t21 = new TreeViewNode("subtest21");
//t2.VMembers.Children.Add(t21);
//TreeViewNode t22 = new TreeViewNode("subtest22");
//t2.VMembers.Children.Add(t22);
////t21.VMembers.Children.Add(new SampleRootBlock());
//TreeViewNode t211 = new TreeViewNode("subtest211");
//t21.VMembers.Children.Add(t211);
//// t21.HMembers.Children.Add(new ButtonBlock("Hello"));
#endregion
#region New way
TreeViewNode t1 = treeViewControl1.AddNode("test1");
TreeViewNode t11 = t1.AddNode("subtest11");
TreeViewNode t12 = t1.AddNode("subtest12");
TreeViewNode t2 = treeViewControl1.AddNode("test2");
TreeViewNode t21 = t2.AddNode("subtest21");
TreeViewNode t211 = t21.AddNode("subtest211");
TreeViewNode t22 = t2.AddNode("subtest22");
#endregion
NodeRelationship r = new NodeRelationship();
r.Sender = t11;
r.Receivers = new List <Block>();
r.Receivers.Add(t22);
r.Receivers.Add(t21);
treeViewControl1.Root.Relationship = r;
}
private static bool IsAllowedToHaveRelationDefault(TreeNode parent, TreeNode child, NodeRelationship relation)
{
return true;
}
private void PaintDragDestinationGraphics(NodeRelationship _prevDNL = NodeRelationship.Null, TreeNode _prevDN = null)
{
if ((_prevDN == null || _prevDNL == NodeRelationship.Null) && (_dropNode == null || _dropNodeLocation == NodeRelationship.Null))
return;
Color DrawColor;
Color SelectColor;
TreeNode node;
NodeRelationship location;
bool removal;
if (_prevDN != null & _prevDNL != NodeRelationship.Null)
{
DrawColor = SystemColors.Window;
SelectColor = SystemColors.Window;
node = _prevDN;
location = _prevDNL;
removal = true;
}
else
{
DrawColor = SystemColors.WindowText;
SelectColor = SystemColors.MenuHighlight;
node = _dropNode;
location = _dropNodeLocation;
removal=false;
}
Graphics g = CreateGraphics();
int dropNodeImageWidth = ImageList.Images[node.ImageIndex == -1 ? 0 : node.ImageIndex].Size.Width + 2;
// Once again, we are not dragging to node over, draw the placeholder using the ParentDragDrop bounds
int LeftPos, RightPos, VertPos = 0;
LeftPos = node.Bounds.Left - dropNodeImageWidth;
RightPos = Width;
switch (location)
{
case NodeRelationship.ChildGoesAbove:
VertPos = node.Bounds.Top;
break;
case NodeRelationship.ChildGoesInside:
VertPos = node.Bounds.Bottom - node.Bounds.Height / 2;
LeftPos = node.Bounds.Right + 6;
if (removal)
{
using (Brush brush = new System.Drawing.SolidBrush(SelectColor))
g.FillRectangle(brush, new Rectangle(node.Bounds.Location, node.Bounds.Size));
if (node.TreeView != null)
OnDrawNode(new DrawTreeNodeEventArgs(g, node, Helper.MakeDrawNodeRectangle(node.Bounds), TreeNodeStates.Default));
}
else
{
using (Brush brush = new System.Drawing.SolidBrush(Color.FromArgb(64, SelectColor)))
g.FillRectangle(brush, new Rectangle(node.Bounds.Location, node.Bounds.Size));
}
using (Pen pen = new System.Drawing.Pen(DrawColor, 1))
g.DrawRectangle(pen, new Rectangle(node.Bounds.Location, node.Bounds.Size));
Point[] triangle = new Point[4] { new Point(LeftPos, VertPos-1), new Point(LeftPos, VertPos), new Point(LeftPos + 11, VertPos + 4), new Point(LeftPos + 11, VertPos - 5) };
using (Brush brush = new System.Drawing.SolidBrush(DrawColor))
g.FillPolygon(brush, triangle);
break;
case NodeRelationship.ChildGoesUnder:
VertPos = node.Bounds.Bottom;
break;
}
using (Pen pen = new System.Drawing.Pen(DrawColor, 2))
g.DrawLine(pen, new Point(LeftPos, VertPos), new Point(RightPos, VertPos));
}
public void MoveNode(TreeNode what, TreeNode where, NodeRelationship relation, NodeRelationship subRelation = NodeRelationship.Null, bool suspendUpdate = false)
{
if (!IsAllowedToHaveRelation(where,what,relation))
return;
if (subRelation == NodeRelationship.Null)
subRelation = Settings.Current.DragIntoFolderToLastPosition ? NodeRelationship.ChildGoesUnder : NodeRelationship.ChildGoesAbove;
TreeNode result = null;
if (!suspendUpdate)
BeginUpdate();
if (where == null)
{
what.Remove();
Nodes.Add(what);
}
else
{
if (what != where)
switch (relation)
{
case NodeRelationship.ChildGoesAbove:
what.Remove();
if (where.Parent != null)
where.Parent.Nodes.Insert(where.Index, what);
else
Nodes.Insert(where.Index, what);
result = what;
break;
case NodeRelationship.ChildGoesInside:
what.Remove();
if (subRelation == NodeRelationship.ChildGoesUnder)
where.Nodes.Add(what);
if (subRelation == NodeRelationship.ChildGoesAbove)
where.Nodes.Insert(0, what);
result = what;
break;
case NodeRelationship.ChildGoesUnder:
what.Remove();
if (where.Parent != null)
where.Parent.Nodes.Insert(where.Index + 1, what);
else
Nodes.Insert(where.Index + 1, what);
result = what;
break;
}
}
if (result!=null)
SelectedNode = result;
if (!suspendUpdate)
EndUpdate();
OnNodeMoved(result, suspendUpdate);
}
protected override void OnDragOver(DragEventArgs drgevent)
{
if (!DraggingInProgress)
{
drgevent.Effect = DragDropEffects.None;
return;
}
drgevent.Effect = DragDropEffects.Move;
TreeNode prevDN = _dropNode;
NodeRelationship prevDNL = _dropNodeLocation;
// Get actual drop node
_dropNode = GetNodeAt(PointToClient(new Point(drgevent.X, drgevent.Y)));
if (_dropNode != null)
{
int OffsetY = PointToClient(Cursor.Position).Y - _dropNode.Bounds.Top;
if (IsFolder(_dropNode))
{
if (OffsetY < (_dropNode.Bounds.Height / 3))
_dropNodeLocation = NodeRelationship.ChildGoesAbove;
else if (OffsetY > (_dropNode.Bounds.Height * 2 / 3))
_dropNodeLocation = NodeRelationship.ChildGoesUnder;
else
_dropNodeLocation = NodeRelationship.ChildGoesInside;
}
else
{
if (OffsetY < (_dropNode.Bounds.Height / 2))
_dropNodeLocation = NodeRelationship.ChildGoesAbove;
else
_dropNodeLocation = NodeRelationship.ChildGoesUnder;
}
//Check if we are allowed to put this into that
if (!IsAllowedToHaveRelation(_dropNode, _dragNode, _dropNodeLocation))
{
drgevent.Effect = DragDropEffects.None;
_dropNodeLocation = NodeRelationship.Null;
}
if (_dropNode == _dragNode && _dropNodeLocation == NodeRelationship.ChildGoesInside)
{
drgevent.Effect = DragDropEffects.None;
_dropNodeLocation = NodeRelationship.Null;
}
// Avoid that drop node is child of drag node
TreeNode tmpNode = _dropNode;
while (tmpNode.Parent != null)
{
if (tmpNode.Parent == this._dragNode)
{
drgevent.Effect = DragDropEffects.None;
_dropNodeLocation = NodeRelationship.Null;
}
tmpNode = tmpNode.Parent;
}
}
//Mechanism to scroll when reaching the end
if (_dropNode != null)
{
//Always ensure that the node we are dropping over/in/under is visible
_dropNode.EnsureVisible();
//Highlight previous node if it exists and...
if (_dropNode.PrevNode != null)
{
//If previous node has no nodes or isnt expanded then this node is a single node and should be visible
if (_dropNode.PrevNode.Nodes.Count == 0 || !_dropNode.PrevNode.IsExpanded)
_dropNode.PrevNode.EnsureVisible();
//If previous node has nodes and is expanded then its last visible child should be made visible
else
{
//Find last visible child recursively
TreeNode lastChild = _dropNode.PrevNode.Nodes[_dropNode.PrevNode.Nodes.Count - 1];
while (lastChild.Nodes.Count > 0 && lastChild.IsExpanded)
lastChild = lastChild.Nodes[lastChild.Nodes.Count - 1];
lastChild.EnsureVisible();
}
}
//Highlight parent node if previous node doesnt exist (meaning node above this node is its parent)
else
{
if (_dropNode.Parent != null)
_dropNode.Parent.EnsureVisible();
}
//Highlight next node if it exists and...
if (_dropNode.NextNode != null)
{
//If this node has no nodes or isnt expanded then it is single, and next node should be visible
if (_dropNode.Nodes.Count == 0 || !_dropNode.IsExpanded)
_dropNode.NextNode.EnsureVisible();
//If this node has nodes and is expanded then we should select its first child
else
_dropNode.Nodes[0].EnsureVisible();
}
//Highlight next node after parent node if there is no next node
else
{
if (_dropNode.Nodes.Count == 0 || !_dropNode.IsExpanded)
if (_dropNode.Parent != null && _dropNode.Parent.NextNode != null)
_dropNode.Parent.NextNode.EnsureVisible();
}
}
if (prevDNL != _dropNodeLocation || prevDN != _dropNode)
{
PaintDragDestinationGraphics(prevDNL, prevDN);
PaintDragDestinationGraphics();
}
base.OnDragOver(drgevent);
}
/// <summary>
/// Get the sum of the branch lengths from this node to the specified node.
/// </summary>
/// <param name="otherNode">The node that should be reached</param>
/// <param name="nodeRelationship">A value indicating how this node is related to <paramref name="otherNode"/>.</param>
/// <returns>The sum of the branch lengths from this node to the specified node.</returns>
public double PathLengthTo(TreeNode otherNode, NodeRelationship nodeRelationship = NodeRelationship.Unknown)
{
Contract.Requires(otherNode != null);
TreeNode LCA = null;
if (this == otherNode)
{
return(0);
}
if (nodeRelationship == NodeRelationship.Unknown)
{
List <TreeNode> myChildren = this.GetChildrenRecursive();
if (myChildren.Contains(otherNode))
{
nodeRelationship = NodeRelationship.Ancestor;
}
else
{
List <TreeNode> otherChildren = otherNode.GetChildrenRecursive();
if (otherChildren.Contains(this))
{
nodeRelationship = NodeRelationship.Descendant;
}
else
{
LCA = GetLastCommonAncestor(new TreeNode[] { this, otherNode });
if (LCA != null)
{
nodeRelationship = NodeRelationship.Relatives;
}
else
{
throw new InvalidOperationException("The two nodes do not belong to the same tree!");
}
}
}
}
switch (nodeRelationship)
{
case NodeRelationship.Relatives:
return(LCA.PathLengthTo(this, NodeRelationship.Ancestor) + LCA.PathLengthTo(otherNode, NodeRelationship.Ancestor));
case NodeRelationship.Ancestor:
for (int i = 0; i < this.Children.Count; i++)
{
if (this.Children[i] == otherNode)
{
return(this.Children[i].Length);
}
else if (this.Children[i].GetChildrenRecursive().Contains(otherNode))
{
return(this.Children[i].Length + this.Children[i].PathLengthTo(otherNode, NodeRelationship.Ancestor));
}
}
throw new InvalidOperationException("Unexpected code path!");
case NodeRelationship.Descendant:
return(otherNode.PathLengthTo(this, NodeRelationship.Ancestor));
default:
throw new InvalidOperationException("The two nodes do not belong to the same tree!");
}
}
private string traverse_tree(XElement node, string parent_id, NodeRelationship relationship)
{
// get this nodes infko
string tagname = node.Name.LocalName;
if (tagname == "math")
{
traverse_tree(node.FirstNode as XElement, parent_id, NodeRelationship.Right);
return("");
}
string my_id = node.Attribute(ns + "id") == null ? null : (string)(node.Attribute(ns + "id").Value);
// relationsip
if (my_id != null)
{
//Console.WriteLine(my_id + " is " + relationship + " of " + parent_id);
edge_list.Add(new Tuple <string, NodeRelationship, string>(my_id, relationship, parent_id));
}
// handle children
switch (tagname)
{
case "mfrac":
traverse_tree(node.FirstNode as XElement, my_id, NodeRelationship.Above);
traverse_tree(node.LastNode as XElement, my_id, NodeRelationship.Below);
return(my_id);
case "mrow":
string left_id = traverse_tree(node.FirstNode as XElement, parent_id, relationship);
traverse_tree(node.LastNode as XElement, left_id, NodeRelationship.Right);
return(left_id);
case "msup":
string super_base_id = traverse_tree(node.FirstNode as XElement, parent_id, relationship);
traverse_tree(node.LastNode as XElement, super_base_id, NodeRelationship.SuperScript);
return(super_base_id);
case "msub":
string sub_base_id = traverse_tree(node.FirstNode as XElement, parent_id, relationship);
traverse_tree(node.LastNode as XElement, sub_base_id, NodeRelationship.SubScript);
return(sub_base_id);
case "msqrt":
string first_under = traverse_tree(node.FirstNode as XElement, my_id, NodeRelationship.Under);
if (node.LastNode != node.FirstNode)
{
traverse_tree(node.FirstNode.NextNode as XElement, first_under, NodeRelationship.Right);
}
return(my_id);
case "msubsup":
var child = node.FirstNode;
string sub_sup_base_id = traverse_tree(child as XElement, parent_id, relationship);
traverse_tree(child.NextNode as XElement, sub_sup_base_id, NodeRelationship.Below);
traverse_tree(child.NextNode.NextNode as XElement, sub_sup_base_id, NodeRelationship.Above);
return(sub_sup_base_id);
case "munderover":
child = node.FirstNode;
string under_over_base_id = traverse_tree(child as XElement, parent_id, relationship);
traverse_tree(child.NextNode as XElement, under_over_base_id, NodeRelationship.Below);
traverse_tree(child.NextNode.NextNode as XElement, under_over_base_id, NodeRelationship.Above);
return(under_over_base_id);
case "munder":
string top_base_id = traverse_tree(node.FirstNode as XElement, parent_id, relationship);
traverse_tree(node.LastNode as XElement, top_base_id, NodeRelationship.Below);
return(top_base_id);
}
// everything esle
return(my_id);
}
/// <summary>
/// In this method we check wether a node can get placed near another node.
/// </summary>
/// <param name="parent">Node being the receiver</param>
/// <param name="child">Node that is trying to get attached</param>
/// <example>
/// You are not allowed to place Event above Start, so any relation which makes it so will be denied.
/// </example>
private bool TreeViewNodes_IsAllowedToHaveRelation(TreeNode parent, TreeNode child, NodeRelationship relation)
{
if (child.Tag == null)
throw new ArgumentException("child", "Moving a TreeNode without a Tag, WTF?");
if (parent.Tag == null)
throw new ArgumentException("parent", "Moving a TreeNode without a Tag, WTF?");
if (relation == NodeRelationship.ChildGoesInside && !TreeViewNodes.IsFolder(parent))
return false;
//Everything except comments cant go above Start (which can only occur in root)
//Therefore, for each node that isnt a comment, and is trying to fit on one level with something that is in root...
if (relation != NodeRelationship.ChildGoesInside && parent.Parent == null && !(child.Tag.GetType() == typeof(MissionNode_Comment) || child.Tag.GetType() == typeof(MissionNode_Start)))
{
//Check that we are not inserting directly above Start node...
if (relation == NodeRelationship.ChildGoesAbove && parent.Tag.GetType() == typeof(MissionNode_Start))
return false;
//...and check that we are not inserting near a node that is above Start node
if (TreeViewNodes.Nodes.IndexOf(_startNode) > TreeViewNodes.Nodes.IndexOf(parent))
return false;
}
//Start, Comment and Unknown cannot go inside anything, start because it must stay on top and other two because they cant have Parent_ID attribute added to them
if (child.Tag.GetType() == typeof(MissionNode_Start) || child.Tag.GetType() == typeof(MissionNode_Comment) || child.Tag.GetType() == typeof(MissionNode_Unknown))
{
//Refuse to go inside anything...
if (relation == NodeRelationship.ChildGoesInside)
return false;
//...or next to a node that is inside something...
if (parent.Parent != null)
return false;
}
//Start additionally cannot go below anything that isnt a comment
if (child.Tag.GetType() == typeof(MissionNode_Start))
{
//Never go under anything other than a comment or yourself
if (relation == NodeRelationship.ChildGoesUnder && parent.Tag.GetType() != typeof(MissionNode_Comment) && parent != child)
return false;
//Go through nodes until we meet the node we are becoming parented to
//If we find anything except comment on the way, this means we are going below
for (int i = 0; i < TreeViewNodes.Nodes.Count; i++)
{
//When we found something other than a comment and the dragged node
if (TreeViewNodes.Nodes[i].Tag.GetType() != typeof(MissionNode_Comment) && TreeViewNodes.Nodes[i] != child)
//In case this is the node we are inserting above - allow it, otherwise deny it
if (relation == NodeRelationship.ChildGoesAbove && TreeViewNodes.Nodes[i] == parent)
break;
else
return false;
if (TreeViewNodes.Nodes[i] == parent)
break;
}
}
return true;
}
/// <summary>
/// In this method we check wether a statement can get placed near another statement.
/// </summary>
/// <param name="parent">Node being the receiver</param>
/// <param name="child">Node that is trying to get attached</param>
/// <example>
/// You are not allowed to place a Condition into Actions root.
/// </example>
private bool TreeViewStatements_IsAllowedToHaveRelation(TreeNode parent, TreeNode child, NodeRelationship relation)
{
if (child.Tag == null || parent.Tag == null) // This might be a comment or a folder
return false;
//You cannot go inside something that isnt a folder
if (relation == NodeRelationship.ChildGoesInside && !TreeViewStatements.IsFolder(parent))
return false;
//Non-statements cannot move at all
if (!(child.Tag is MissionStatement))
return false;
//If going inside, Conditions can only go inside codintion folder, actions can go inside actions folder, comment can go anywhere
if (relation == NodeRelationship.ChildGoesInside && (((string)parent.Tag == "conditions" && ((MissionStatement)child.Tag).Kind == MissionStatementKind.Action) || ((string)parent.Tag == "actions" && ((MissionStatement)child.Tag).Kind == MissionStatementKind.Condition) || ((string)parent.Tag != "actions" && (string)parent.Tag != "conditions")))
return false;
//Comments cannot go inside conditions!
if (relation == NodeRelationship.ChildGoesInside && ((string)parent.Tag == "conditions" && ((MissionStatement)child.Tag).Kind == MissionStatementKind.Commentary))
return false;
//If going adjacent to something
//Conditions can only go adjacent to conditions or comments inside conditions folder
//Actions can only go adjacent to actions or comments inside actions folder
if (relation == NodeRelationship.ChildGoesAbove || relation == NodeRelationship.ChildGoesUnder)
{
if (!(parent.Tag is MissionStatement))
return false;
if ((((MissionStatement)child.Tag).Kind == MissionStatementKind.Action) && ((string)parent.Parent.Tag != "actions"))
return false;
if ((((MissionStatement)child.Tag).Kind == MissionStatementKind.Condition) && ((string)parent.Parent.Tag != "conditions"))
return false;
}
//Comments also cannot go under last condition
if (relation == NodeRelationship.ChildGoesUnder && (((MissionStatement)child.Tag).Kind == MissionStatementKind.Commentary))
{
if (parent.Parent != null && parent.Parent.LastNode == parent && (string)parent.Parent.Tag == "conditions")
return false;
}
return true;
}
public Task Sort()
{
var nodes = this.nodes.ToDictionary
(
kvp => kvp.Key,
kvp => new NodeRelationship {
Dependencies = kvp.Value.Dependencies.ToHashSet(actionComparer), Dependents = kvp.Value.Dependents.ToHashSet(actionComparer)
},
actionComparer
);
var taskDictionary = this.nodes.ToDictionary
(
kvp => kvp.Key,
kvp => new TaskRelationship(),
actionComparer
);
var sortedNodeIds = new List <Node>();
// Add root nodes
sortedNodeIds.AddRange(this.nodes.Where(kvp => kvp.Value.Dependencies.Count == 0).Select(kvp => kvp.Key));
var rootTasks = new List <Task>();
foreach (Node nodeId in sortedNodeIds)
{
var task = new Task(nodeId.Action);
taskDictionary[nodeId].Task = task;
rootTasks.Add(task);
}
for (var index = 0; index < sortedNodeIds.Count; ++index)
{
Node nodeId = sortedNodeIds[index];
Task task = taskDictionary[nodeId].Task ?? Task.WhenAll(taskDictionary[nodeId].TaskDependencies).ContinueWith((Task t) => { nodeId.Action.Invoke(); });
taskDictionary[nodeId].Task = task;
HashSet <Node> dependentIds = nodes[nodeId].Dependents;
foreach (Node dependentId in dependentIds)
{
NodeRelationship dependent = nodes[dependentId];
taskDictionary[dependentId].TaskDependencies.Add(task);
dependent.Dependencies.Remove(sortedNodeIds[index]);
if (dependent.Dependencies.Count == 0)
{
sortedNodeIds.Add(dependentId);
}
}
}
var cycledNodes = nodes.Where(kvp => kvp.Value.Dependencies.Count != 0).ToArray();
if (cycledNodes.Length > 0)
{
return(Task.Run(() => Console.WriteLine("Failed to run. Cycle detected with the following nodes (" + string.Join(", ", cycledNodes.Select(kvp => kvp.Key.Name)) + ")")));
}
else
{
foreach (Task task in rootTasks)
{
task.Start();
}
return(Task.WhenAll(taskDictionary.Values.Select(x => x.Task)).ContinueWith((Task t) => Console.WriteLine("")));
}
}
public void MoveNode(TreeNode what, TreeNode where, NodeRelationship relation, NodeRelationship subRelation = NodeRelationship.Null, bool suspendUpdate = false)
{
if (!IsAllowedToHaveRelation(where, what, relation))
{
return;
}
if (subRelation == NodeRelationship.Null)
{
subRelation = Settings.Current.DragIntoFolderToLastPosition ? NodeRelationship.ChildGoesUnder : NodeRelationship.ChildGoesAbove;
}
TreeNode result = null;
if (!suspendUpdate)
{
BeginUpdate();
}
if (where == null)
{
what.Remove();
Nodes.Add(what);
}
else
{
if (what != where)
{
switch (relation)
{
case NodeRelationship.ChildGoesAbove:
what.Remove();
if (where.Parent != null)
{
where.Parent.Nodes.Insert(where.Index, what);
}
else
{
Nodes.Insert(where.Index, what);
}
result = what;
break;
case NodeRelationship.ChildGoesInside:
what.Remove();
if (subRelation == NodeRelationship.ChildGoesUnder)
{
where.Nodes.Add(what);
}
if (subRelation == NodeRelationship.ChildGoesAbove)
{
where.Nodes.Insert(0, what);
}
result = what;
break;
case NodeRelationship.ChildGoesUnder:
what.Remove();
if (where.Parent != null)
{
where.Parent.Nodes.Insert(where.Index + 1, what);
}
else
{
Nodes.Insert(where.Index + 1, what);
}
result = what;
break;
}
}
}
if (result != null)
{
SelectedNode = result;
}
if (!suspendUpdate)
{
EndUpdate();
}
OnNodeMoved(result, new NodeMovedEventArgs(suspendUpdate));
}
protected override void OnDragOver(DragEventArgs drgevent)
{
if (!DraggingInProgress)
{
drgevent.Effect = DragDropEffects.None;
return;
}
drgevent.Effect = DragDropEffects.Move;
TreeNode prevDN = _dropNode;
NodeRelationship prevDNL = _dropNodeLocation;
// Get actual drop node
_dropNode = GetNodeAt(PointToClient(new Point(drgevent.X, drgevent.Y)));
if (_dropNode != null)
{
int OffsetY = PointToClient(Cursor.Position).Y - _dropNode.Bounds.Top;
if (IsFolder(_dropNode))
{
if (OffsetY < (_dropNode.Bounds.Height / 3))
{
_dropNodeLocation = NodeRelationship.ChildGoesAbove;
}
else if (OffsetY > (_dropNode.Bounds.Height * 2 / 3))
{
_dropNodeLocation = NodeRelationship.ChildGoesUnder;
}
else
{
_dropNodeLocation = NodeRelationship.ChildGoesInside;
}
}
else
{
if (OffsetY < (_dropNode.Bounds.Height / 2))
{
_dropNodeLocation = NodeRelationship.ChildGoesAbove;
}
else
{
_dropNodeLocation = NodeRelationship.ChildGoesUnder;
}
}
//Check if we are allowed to put this into that
if (!IsAllowedToHaveRelation(_dropNode, _dragNode, _dropNodeLocation))
{
drgevent.Effect = DragDropEffects.None;
_dropNodeLocation = NodeRelationship.Null;
}
if (_dropNode == _dragNode && _dropNodeLocation == NodeRelationship.ChildGoesInside)
{
drgevent.Effect = DragDropEffects.None;
_dropNodeLocation = NodeRelationship.Null;
}
// Avoid that drop node is child of drag node
TreeNode tmpNode = _dropNode;
while (tmpNode.Parent != null)
{
if (tmpNode.Parent == this._dragNode)
{
drgevent.Effect = DragDropEffects.None;
_dropNodeLocation = NodeRelationship.Null;
}
tmpNode = tmpNode.Parent;
}
}
//Mechanism to scroll when reaching the end
if (_dropNode != null)
{
//Always ensure that the node we are dropping over/in/under is visible
_dropNode.EnsureVisible();
//Highlight previous node if it exists and...
if (_dropNode.PrevNode != null)
{
//If previous node has no nodes or isn't expanded then this node is a single node and should be visible
if (_dropNode.PrevNode.Nodes.Count == 0 || !_dropNode.PrevNode.IsExpanded)
{
_dropNode.PrevNode.EnsureVisible();
}
//If previous node has nodes and is expanded then its last visible child should be made visible
else
{
//Find last visible child recursively
TreeNode lastChild = _dropNode.PrevNode.Nodes[_dropNode.PrevNode.Nodes.Count - 1];
while (lastChild.Nodes.Count > 0 && lastChild.IsExpanded)
{
lastChild = lastChild.Nodes[lastChild.Nodes.Count - 1];
}
lastChild.EnsureVisible();
}
}
//Highlight parent node if previous node doesnt exist (meaning node above this node is its parent)
else
{
if (_dropNode.Parent != null)
{
_dropNode.Parent.EnsureVisible();
}
}
//Highlight next node if it exists and...
if (_dropNode.NextNode != null)
{
//If this node has no nodes or isn't expanded then it is single, and next node should be visible
if (_dropNode.Nodes.Count == 0 || !_dropNode.IsExpanded)
{
_dropNode.NextNode.EnsureVisible();
}
//If this node has nodes and is expanded then we should select its first child
else
{
_dropNode.Nodes[0].EnsureVisible();
}
}
//Highlight next node after parent node if there is no next node
else
{
if (_dropNode.Nodes.Count == 0 || !_dropNode.IsExpanded)
{
if (_dropNode.Parent != null && _dropNode.Parent.NextNode != null)
{
_dropNode.Parent.NextNode.EnsureVisible();
}
}
}
}
if (prevDNL != _dropNodeLocation || prevDN != _dropNode)
{
PaintDragDestinationGraphics(prevDNL, prevDN);
PaintDragDestinationGraphics();
}
base.OnDragOver(drgevent);
}
private void PaintDragDestinationGraphics(NodeRelationship _prevDNL = NodeRelationship.Null, TreeNode _prevDN = null)
{
if ((_prevDN == null || _prevDNL == NodeRelationship.Null) && (_dropNode == null || _dropNodeLocation == NodeRelationship.Null))
{
return;
}
Color DrawColor;
Color SelectColor;
TreeNode node;
NodeRelationship location;
bool removal;
if (_prevDN != null & _prevDNL != NodeRelationship.Null)
{
DrawColor = SystemColors.Window;
SelectColor = SystemColors.Window;
node = _prevDN;
location = _prevDNL;
removal = true;
}
else
{
DrawColor = SystemColors.WindowText;
SelectColor = SystemColors.MenuHighlight;
node = _dropNode;
location = _dropNodeLocation;
removal = false;
}
Graphics g = CreateGraphics();
int dropNodeImageWidth = ImageList.Images[node.ImageIndex == -1 ? 0 : node.ImageIndex].Size.Width + 2;
// Once again, we are not dragging to node over, draw the placeholder using the ParentDragDrop bounds
int LeftPos, RightPos, VertPos = 0;
LeftPos = node.Bounds.Left - dropNodeImageWidth;
RightPos = Width;
switch (location)
{
case NodeRelationship.ChildGoesAbove:
VertPos = node.Bounds.Top;
break;
case NodeRelationship.ChildGoesInside:
VertPos = node.Bounds.Bottom - node.Bounds.Height / 2;
LeftPos = node.Bounds.Right + 6;
if (removal)
{
using (Brush brush = new System.Drawing.SolidBrush(SelectColor))
g.FillRectangle(brush, new Rectangle(node.Bounds.Location, node.Bounds.Size));
if (node.TreeView != null)
{
OnDrawNode(new DrawTreeNodeEventArgs(g, node, Helper.MakeDrawNodeRectangle(node.Bounds), TreeNodeStates.Default));
}
}
else
{
using (Brush brush = new System.Drawing.SolidBrush(Color.FromArgb(64, SelectColor)))
g.FillRectangle(brush, new Rectangle(node.Bounds.Location, node.Bounds.Size));
}
using (Pen pen = new System.Drawing.Pen(DrawColor, 1))
g.DrawRectangle(pen, new Rectangle(node.Bounds.Location, node.Bounds.Size));
Point[] triangle = new Point[4] {
new Point(LeftPos, VertPos - 1), new Point(LeftPos, VertPos), new Point(LeftPos + 11, VertPos + 4), new Point(LeftPos + 11, VertPos - 5)
};
using (Brush brush = new System.Drawing.SolidBrush(DrawColor))
g.FillPolygon(brush, triangle);
break;
case NodeRelationship.ChildGoesUnder:
VertPos = node.Bounds.Bottom;
break;
}
using (Pen pen = new System.Drawing.Pen(DrawColor, 2))
g.DrawLine(pen, new Point(LeftPos, VertPos), new Point(RightPos, VertPos));
}
private static bool IsAllowedToHaveRelationDefault(TreeNode parent, TreeNode child, NodeRelationship relation)
{
return(true);
}