private string ArgsToText(
TVNMA_ActionArgs Args,
bool bBefore)
{
// Deleted node?
if (!bBefore && Args.Action == TVNMA_Actions.Delete)
{
if (Args.DestNode != null)
{
return string.Format("Action={0}, OldPath=[{1}] CurSelPath=[{2}]",
Args.Action.ToString(),
Args.Tag as string,
Args.DestNode.FullPath);
}
else
{
return "Empty!";
}
}
else
{
return string.Format("@{0},Action={1},OldPath=[{2}] NewPath[{3}]",
Args.SrcNode.Index,
Args.Action.ToString(),
Args.Tag as string,
Args.SrcNode.FullPath);
}
}
private bool BeforeTVNMA(TVNMA_ActionArgs Args)
{
switch (Args.Action)
{
case TVNMA_Actions.Add_Above:
Args.TextNew = "New node above - " + Args.TextOld;
break;
case TVNMA_Actions.Add_Below:
Args.TextNew = "New node below - " + Args.TextOld;
break;
case TVNMA_Actions.Rename:
Args.TextNew = Args.TextOld + "*";
break;
}
Text = ArgsToText(Args, true);
Args.Tag = Args.SrcNode.FullPath;
return true;
}
private bool DoOnBeforeAction(TVNMA_ActionArgs Args)
{
return OnBeforeAction == null ? true : OnBeforeAction(Args);
}
private bool CarryTVNodeAction(
TVNMA_ActionArgs Args)
{
// SrcNode should always be not null
if (Args.SrcNode == null)
return false;
// Capture old title before calling the callback
Args.TextOld = Args.SrcNode.Text;
// Internal flag allows us to call this function recursively if needed.
bool bInternal = Args.Action.HasFlag(TVNMA_Actions.Internal);
if (!bInternal && !DoOnBeforeAction(Args))
return false;
var tv = Args.SrcNode.TreeView;
TreeNode PrevParent = Args.SrcNode.Parent == null ? tv.TopNode : Args.SrcNode.Parent;
// Clear the internal flag
Args.Action &= ~TVNMA_Actions.Internal;
switch (Args.Action)
{
case TVNMA_Actions.Rename:
Args.SrcNode.Text = Args.TextNew;
break;
case TVNMA_Actions.Add_Both:
{
// Create new node with the desired title.
// (No need to insert the node into the tree since it will be moved.)
Args.DestNode = new TreeNode(Args.TextNew);
// Move the node above
Args.DestNode.MoveAboveOrBelow(
Args.SrcNode,
bAbove: Args.Action == TVNMA_Actions.Add_Above);
break;
}
case TVNMA_Actions.Add_Above:
case TVNMA_Actions.Add_Below:
goto case TVNMA_Actions.Add_Both;
case TVNMA_Actions.Move_Above:
Args.SrcNode.MoveAboveOrBelow(
Args.DestNode,
bAbove: true);
break;
case TVNMA_Actions.Move_Below:
Args.SrcNode.MoveAboveOrBelow(
Args.DestNode,
bAbove: false);
break;
case TVNMA_Actions.Move_Into_Top:
Args.SrcNode.MakeChildOf(
Args.DestNode,
bAppend: false);
break;
case TVNMA_Actions.Move_Into_Bottom:
Args.SrcNode.MakeChildOf(
Args.DestNode,
bAppend: true);
break;
case TVNMA_Actions.Indent:
Args.SrcNode.Indent();
break;
case TVNMA_Actions.UnIndent:
Args.SrcNode.UnIndent();
break;
case TVNMA_Actions.Delete:
{
// Elect the new selected node after deleltion
// NextNode?
Args.DestNode = Args.SrcNode.NextNode;
// PrevNode?
if (Args.DestNode == null)
Args.DestNode = Args.SrcNode.PrevNode;
// Parent?
if (Args.DestNode == null)
Args.DestNode = Args.SrcNode.Parent;
// Delete the node
Args.SrcNode.Remove();
// Also clear the node reference so the caller knows
Args.SrcNode = null;
break;
}
default:
return false;
}
TreeNode VisSrcNode = (Args.Action == TVNMA_Actions.Delete) ? Args.DestNode : Args.SrcNode;
if (VisSrcNode != null)
{
tv.SelectedNode = VisSrcNode;
// Set new parent
if (VisSrcNode.Parent == null && tv.TopNode != null)
tv.TopNode.SetAutoImageIndex();
else
VisSrcNode.Parent.SetAutoImageIndex();
}
if (PrevParent != null)
PrevParent.SetAutoImageIndex();
return bInternal ? true : DoOnAfterAction(Args);
}
private void CreateMenuItems()
{
m_AllActions = TVNMA_Actions.None;
if (WantedActions == null)
return;
// Create all menu items
var _acts = new Dictionary<TVNMA_Actions, TVNMA_ActionOptions>();
foreach (var act in WantedActions)
{
if (bWantMenu)
{
_acts[act.Action] = act;
act.MenuItem = new ToolStripMenuItem()
{
ShortcutKeys = act.Shortcut,
Text = act.MenuText
};
}
m_AllActions |= act.Action;
}
if (!bWantMenu)
return;
if (Menu == null)
Menu = new ContextMenuStrip();
m_AllMenuItems = new List<ToolStripItem>();
var AddSep = new Action(() =>
{
m_AllMenuItems.Add(new ToolStripSeparator());
});
//
// Assign Ident menu item actions
//
TVNMA_ActionOptions Opts;
if (_acts.TryGetValue(TVNMA_Actions.Indent, out Opts))
{
Opts.MenuItem.Click += new EventHandler(delegate (object o, EventArgs ev)
{
CarryTVNodeAction(new TVNMA_ActionArgs()
{
Action = TVNMA_Actions.Indent,
SrcNode = tv.SelectedNode
});
});
m_AllMenuItems.Add(Opts.MenuItem);
}
if (_acts.TryGetValue(TVNMA_Actions.UnIndent, out Opts))
{
Opts.MenuItem.Click += new EventHandler(delegate (object o, EventArgs ev)
{
CarryTVNodeAction(new TVNMA_ActionArgs()
{
Action = TVNMA_Actions.UnIndent,
SrcNode = tv.SelectedNode
});
});
m_AllMenuItems.Add(Opts.MenuItem);
}
if (m_AllActions.HasFlag(TVNMA_Actions.Indent_Both))
AddSep();
//
// Assign Add menu item actions
//
if (_acts.TryGetValue(TVNMA_Actions.Add_Above, out Opts))
{
Opts.MenuItem.Click += new EventHandler(delegate (object o, EventArgs ev)
{
CarryTVNodeAction(new TVNMA_ActionArgs()
{
Action = TVNMA_Actions.Add_Above,
SrcNode = tv.SelectedNode
});
});
m_AllMenuItems.Add(Opts.MenuItem);
}
if (_acts.TryGetValue(TVNMA_Actions.Add_Below, out Opts))
{
Opts.MenuItem.Click += new EventHandler(delegate (object o, EventArgs ev)
{
CarryTVNodeAction(new TVNMA_ActionArgs()
{
Action = TVNMA_Actions.Add_Below,
SrcNode = tv.SelectedNode
});
});
m_AllMenuItems.Add(Opts.MenuItem);
}
if (m_AllActions.HasFlag(TVNMA_Actions.Add_Both))
AddSep();
//
// Assign Move menu item actions
//
if (_acts.TryGetValue(TVNMA_Actions.Move_Above, out Opts))
{
Opts.MenuItem.Click += new EventHandler(delegate (object o, EventArgs ev)
{
var Args = new TVNMA_ActionArgs()
{
Action = TVNMA_Actions.Move_Above,
SrcNode = tv.SelectedNode,
DestNode = tv.SelectedNode.PrevNode
};
if (Args.DestNode != null)
CarryTVNodeAction(Args);
});
m_AllMenuItems.Add(Opts.MenuItem);
}
if (_acts.TryGetValue(TVNMA_Actions.Move_Below, out Opts))
{
Opts.MenuItem.Click += new EventHandler(delegate (object o, EventArgs ev)
{
var Args = new TVNMA_ActionArgs()
{
Action = TVNMA_Actions.Move_Below,
SrcNode = tv.SelectedNode,
DestNode = tv.SelectedNode.NextNode
};
if (Args.DestNode != null)
CarryTVNodeAction(Args);
});
m_AllMenuItems.Add(Opts.MenuItem);
}
if (m_AllActions.HasFlag(TVNMA_Actions.Move_Both))
AddSep();
//
// Add Rename/Delete
//
if (_acts.TryGetValue(TVNMA_Actions.Rename, out Opts))
{
Opts.MenuItem.Click += new EventHandler(delegate (object o, EventArgs ev)
{
CarryTVNodeAction(new TVNMA_ActionArgs()
{
Action = TVNMA_Actions.Rename,
SrcNode = tv.SelectedNode
});
});
m_AllMenuItems.Add(Opts.MenuItem);
}
if (_acts.TryGetValue(TVNMA_Actions.Delete, out Opts))
{
Opts.MenuItem.Click += new EventHandler(delegate (object o, EventArgs ev)
{
CarryTVNodeAction(new TVNMA_ActionArgs()
{
Action = TVNMA_Actions.Delete,
SrcNode = tv.SelectedNode
});
});
m_AllMenuItems.Add(Opts.MenuItem);
}
if (m_AllActions.HasFlag(TVNMA_Actions.RenOrDel))
AddSep();
//
// Add all the menu items
//
if (m_AllMenuItems[m_AllMenuItems.Count - 1] is ToolStripSeparator)
m_AllMenuItems.RemoveAt(m_AllMenuItems.Count - 1);
foreach (var mi in m_AllMenuItems)
Menu.Items.Add(mi);
tv.ContextMenuStrip = Menu;
}
private void SetupDragDropHandlers()
{
if (!bWantDragDrop)
return;
tv.AllowDrop = true;
//
// ItemDrag
//
tv.ItemDrag += new ItemDragEventHandler(delegate (object sender, ItemDragEventArgs e)
{
tv.DoDragDrop(
e.Item,
DragDropEffects.Copy | DragDropEffects.Move | DragDropEffects.Link);
});
//
// DragEnter
//
tv.DragEnter += new DragEventHandler(delegate (object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent(TV_NODE))
{
e.Effect = GetDragEffectFromKeyState(e.KeyState);
}
else
{
e.Effect = DragDropEffects.None;
}
});
//
// DragOver
//
tv.DragOver += new DragEventHandler(delegate (object sender, DragEventArgs e)
{
if (!e.Data.GetDataPresent(TV_NODE))
return;
var treeView = sender as System.Windows.Forms.TreeView;
Point pt = treeView.PointToClient(new Point(e.X, e.Y));
TreeNode DestTreeNode = treeView.GetNodeAt(pt);
if (DestTreeNode == null)
return;
TreeNode SrcTreeNode = e.Data.GetData(TV_NODE) as TreeNode;
// Select the destination node
treeView.SelectedNode = DestTreeNode;
// Make sure we are not going to drop the src node into any of its parent nodes
var parent = DestTreeNode;
while (parent != null)
{
if (parent == SrcTreeNode)
{
e.Effect = DragDropEffects.None;
return;
}
// Walk up the tree to figure out that the destination node is not inside its parent
parent = parent.Parent;
}
if (nAutoExpandMS > 0)
{
// If the destination node has changed, then reset the stopwatch
if (m_LastDragOverDestTreeNode != DestTreeNode)
{
m_DragOverAutoExpandStopWatch.Restart();
}
else
{
// Enough time elapsed? User's intent to open this node
if (m_DragOverAutoExpandStopWatch.ElapsedMilliseconds > nAutoExpandMS)
DestTreeNode.Expand();
}
// Remember the last node
m_LastDragOverDestTreeNode = DestTreeNode;
}
e.Effect = GetDragEffectFromKeyState(e.KeyState);
});
//
// DragDrop
//
tv.DragDrop += new DragEventHandler(delegate (object sender, DragEventArgs e)
{
if (!e.Data.GetDataPresent(TV_NODE))
{
e.Effect = DragDropEffects.None;
return;
}
var tv = sender as System.Windows.Forms.TreeView;
Point pt = tv.PointToClient(new Point(e.X, e.Y));
TreeNode DestTreeNode = tv.GetNodeAt(pt);
TreeNode SrcTreeNode = e.Data.GetData(TV_NODE) as TreeNode;
// Remember the source node's parent (before the action takes place).
// We need this so we can properly update its image indexes.
// For example, if we move out its last child, then it becomes a regular node.
var SrcParent = SrcTreeNode.Parent;
// Create a TreeNode Action
var Args = new TVNMA_ActionArgs()
{
SrcNode = SrcTreeNode,
DestNode = DestTreeNode
};
// Convert KeyStates into an elaborate action
if (m_bDragInto && m_bDragAbove)
{
Args.Action = TVNMA_Actions.Move_Into_Top;
}
else if (m_bDragInto && !m_bDragAbove)
{
Args.Action = TVNMA_Actions.Move_Into_Bottom;
}
else if (m_bDragAbove)
{
Args.Action = TVNMA_Actions.Move_Above;
}
else if (m_bDragInto)
{
Args.Action = TVNMA_Actions.Move_Into_Bottom;
}
// No action intended yet, let's try to guess user's intent
if (Args.Action == TVNMA_Actions.None)
{
// Must be moving to a parent node
if (DestTreeNode.IsExpanded)
{
Args.Action = TVNMA_Actions.Move_Into_Bottom;
}
// Just a regular node, let's just move above
else
{
Args.Action = TVNMA_Actions.Move_Above;
}
}
CarryTVNodeAction(Args);
DestTreeNode.SetAutoImageIndex();
if (SrcParent != null)
SrcParent.SetAutoImageIndex();
});
//
// BeforeCollapse
//
tv.BeforeCollapse += new TreeViewCancelEventHandler(delegate (object sender, TreeViewCancelEventArgs e)
{
e.Node.SetAllImageIndex(TVNMA_NodeIconIndex.Closed);
});
//
// BeforeExpand
//
tv.BeforeExpand += new TreeViewCancelEventHandler(delegate (object sender, TreeViewCancelEventArgs e)
{
e.Node.SetAllImageIndex(TVNMA_NodeIconIndex.Opened);
});
}
private bool AfterTVNMA(TVNMA_ActionArgs Args)
{
Text = ArgsToText(Args, false);
return true;
}