Dear Tom,
As I understand, you want to change the default highlight color for the
TreeView nodes.
This can be done by setting the DrawMode of TreeView to OwnerDrawAll and
handling the DrawNode event.
To better design the code, we can create a custom TreeNode class to add a
HighLightColor property, something like this:
public class MyTreeNode : TreeNode
{
private Color _highLightColor = SystemColors.Highlight;
public Color HighLightColor
{
get { return _highLightColor; }
set { _highLightColor = value; }
}
}
Then we can do something like this in the DrawNode event handler:
void treeView1_DrawNode(object sender, DrawTreeNodeEventArgs e)
{
MyTreeNode node = e.Node as MyTreeNode;
if (node != null && SystemColors.Highlight !=
node.HighLightColor)
{
Rectangle nodeBounds = e.Node.Bounds;
if (this.treeView1.ShowLines)
{
Rectangle treeLine = e.Bounds;
treeLine.Width = nodeBounds.Left;
//Draw node line
using (Pen p = new Pen(Color.Gray))
{
p.DashStyle =
System.Drawing.Drawing2D.DashStyle.Dot;
e.Graphics.DrawLine(p,
treeLine.X + treeLine.Width / 2 + 1,
treeLine.Y + treeLine.Height / 2,
treeLine.Right,
treeLine.Y + treeLine.Height / 2);
e.Graphics.DrawLine(p,
treeLine.X + treeLine.Width / 2 +1,
treeLine.Y,
treeLine.X + treeLine.Width / 2 +1,
treeLine.Bottom);
}
}
//Draw hight light
if ((e.State & TreeNodeStates.Selected) != 0)
{
using (SolidBrush br = new
SolidBrush(node.HighLightColor))
{
e.Graphics.FillRectangle(br, e.Node.Bounds);
}
}
else
{
using (SolidBrush br = new SolidBrush(node.BackColor))
{
e.Graphics.FillRectangle(br, e.Node.Bounds);
}
}
using (SolidBrush br = new SolidBrush(Color.Black))
{
e.Graphics.DrawString(e.Node.Text, this.treeView1.Font,
br, e.Node.Bounds);
}
}
else
{
e.DrawDefault = true;
}
}
To test the effect, you can put the following code in the Form_Load method
private void Form2_Load(object sender, EventArgs e)
{
this.treeView1.DrawNode += new
DrawTreeNodeEventHandler(treeView1_DrawNode);
this.treeView1.DrawMode = TreeViewDrawMode.OwnerDrawAll;
MyTreeNode RedNode = new MyTreeNode();
RedNode.HighLightColor = Color.Red;
RedNode.Text = "Red";
RedNode.BackColor = Color.Orange;
this.treeView1.Nodes.Add(RedNode);
MyTreeNode GreenNode = new MyTreeNode();
GreenNode.HighLightColor = Color.Green;
GreenNode.Text = "Green";
GreenNode.BackColor = Color.White;
this.treeView1.Nodes.Add(GreenNode);
MyTreeNode YellowNode = new MyTreeNode();
YellowNode.HighLightColor = Color.Yellow;
YellowNode.Text = "Blue";
YellowNode.BackColor = Color.SaddleBrown;
this.treeView1.Nodes.Add(YellowNode);
//Default node
this.treeView1.Nodes.Add("A default one");
}
Build and run the code, you should find that the the highlight color for
the first three nodes are different.
If you have any unclear about my sample, please feel free to let me know.
Sincerely,
Zhi-Xin Ye
Microsoft Managed Newsgroup Support Team
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