private void CustomTreeView_Load(object sender, EventArgs e)
{
MultiSelectTreeNode2 nodeP = new MultiSelectTreeNode2("Node Group");
multiSelectTreeView1.Nodes.Add(nodeP);
MultiSelectTreeNode2 node = new MultiSelectTreeNode2("First Node");
node.Select();
nodeP.Nodes.Add(node);
node = new MultiSelectTreeNode2("Second Node");
nodeP.Nodes.Add(node);
node = new MultiSelectTreeNode2("Third Node");
nodeP.Nodes.Add(node);
node = new MultiSelectTreeNode2("Fourth Node");
nodeP.Nodes.Add(node);
node = new MultiSelectTreeNode2("Fifth Node");
nodeP.Nodes.Add(node);
node = new MultiSelectTreeNode2("Sixth Node");
nodeP.Nodes.Add(node);
node = new MultiSelectTreeNode2("Seventh Node");
nodeP.Nodes.Add(node);
multiSelectTreeView1.ExpandAll();
}
public void UnSelect(MultiSelectTreeNode2 node)
{
if (node.IsSelected)
{
node.IsSelected = false;
// Update the collection.
selectedNodes.Remove(node);
base.Invalidate(base.Bounds);
}
}
public void Select(MultiSelectTreeNode2 node)
{
if (!node.IsSelected)
{
node.IsSelected = true;
// Update the collection.
selectedNodes.Add(node);
base.Invalidate(base.Bounds);
}
}
protected override void OnNodeMouseClick(TreeNodeMouseClickEventArgs e)
{
TreeNode nodeHit = base.HitTest(e.X, e.Y).Node;
if (nodeHit != null)
{
MultiSelectTreeNode2 multiNode = nodeHit as MultiSelectTreeNode2;
if (multiNode != null)
{
// Use advanced selection rules.
if ((Control.ModifierKeys & Keys.Control) == 0)
{
// Ctrl is not held down.
// Remove previous selection.
List <MultiSelectTreeNode2> nodesToDelete =
new List <MultiSelectTreeNode2>();
foreach (MultiSelectTreeNode2 node in selectedNodes)
{
if (node != multiNode)
{
nodesToDelete.Add(node);
}
}
foreach (MultiSelectTreeNode2 node in nodesToDelete)
{
node.UnSelect();
}
}
if (multiNode.IsSelected)
{
// Node is already selected.
// Toggle it off.
multiNode.UnSelect();
}
else
{
// Add new selection.
multiNode.Select();
}
}
}
}
public void UnSelect(MultiSelectTreeNode2 node)
{
if (node.IsSelected)
{
node.IsSelected = false;
// Update the collection.
selectedNodes.Remove(node);
base.Invalidate(base.Bounds);
}
}
public void Select(MultiSelectTreeNode2 node)
{
if (!node.IsSelected)
{
node.IsSelected = true;
// Update the collection.
selectedNodes.Add(node);
base.Invalidate(base.Bounds);
}
}
protected override void OnDrawNode(DrawTreeNodeEventArgs e)
{
// Check for multiple selection support.
MultiSelectTreeNode2 multiNode = e.Node as MultiSelectTreeNode2;
if (multiNode != null)
{
// Retrieve the node font. If the node font has not been set,
// use the TreeView font.
Font nodeFont = multiNode.NodeFont;
if (nodeFont == null)
{
nodeFont = base.Font;
}
// Create brushes for the background and foreground.
Brush backBrush, foreBrush;
if (multiNode.IsSelected)
{
foreBrush = SystemBrushes.HighlightText;
backBrush = SystemBrushes.Highlight;
}
else
{
if (multiNode.ForeColor != Color.Empty)
{
foreBrush = new SolidBrush(multiNode.ForeColor);
}
else
{
foreBrush = new SolidBrush(multiNode.TreeView.ForeColor);
}
if (multiNode.BackColor != Color.Empty)
{
backBrush = new SolidBrush(multiNode.BackColor);
}
else
{
backBrush = new SolidBrush(multiNode.TreeView.BackColor);
}
}
// Draw the background of the selected node.
Rectangle bounds = e.Bounds;
bounds.X += 1;
e.Graphics.FillRectangle(backBrush, bounds);
// Draw the node text.
e.Graphics.DrawString(e.Node.Text, nodeFont, foreBrush, e.Bounds.X, e.Bounds.Y);
// If the node has focus, draw the focus rectangle.
if ((e.State & TreeNodeStates.Focused) != 0)
{
using (Pen focusPen = new Pen(Color.Black))
{
focusPen.DashStyle = System.Drawing.Drawing2D.DashStyle.Dot;
Rectangle focusBounds = e.Bounds;
focusBounds.Size = new Size(focusBounds.Width,
focusBounds.Height - 1);
e.Graphics.DrawRectangle(focusPen, focusBounds);
}
}
// Dispose brushes if they were created
// just for this node.
if (multiNode.IsSelected == false)
{
backBrush.Dispose();
foreBrush.Dispose();
}
}
else
{
// No multiple selection support.
e.DrawDefault = true;
}
}