/// <summary>
/// Test TreeNodeDrawn event handler. This occurs after the tree view
/// has drawn the node.
/// </summary>
/// <param name="sender">The sender of the event</param>
/// <param name="e">The event arguments</param>
private void tvExtTree_TreeNodeDrawn(object sender, DrawTreeNodeExtendedEventArgs e)
{
Pen pen;
int top;
if(chkFormDrawNode.Checked && e.Node.Level == 0 && e.ImageIndex != -1)
{
// Nothing exciting, we'll just draw a line through
// top level nodes that have an image index set.
if((e.State & TreeNodeStates.Focused) != 0 && tvExtTree.FullRowSelect)
pen = SystemPens.ControlLightLight;
else
pen = SystemPens.ControlDarkDark;
top = e.NodeBounds.Top + (e.NodeBounds.Height / 2);
e.Graphics.DrawLine(pen, e.NodeBounds.Left, top,
e.NodeBounds.Left + e.NodeBounds.Width, top);
}
}
/// <summary>
/// Test TreeNodeDrawing event handler. This occurs before the tree
/// view draws the node.
/// </summary>
/// <param name="sender">The sender of the event</param>
/// <param name="e">The event arguments</param>
private void tvExtTree_TreeNodeDrawing(object sender, DrawTreeNodeExtendedEventArgs e)
{
if(!chkFormDrawNode.Checked)
return;
// Use solid 2px lines
e.LinePen.DashStyle = DashStyle.Solid;
e.LinePen.Width = 2;
// Change the text by adding the node name. Assigning new text
// automatically recalculates the text and focus bounds. We could
// draw the text, but we'll let the base class handle it. Note that
// since the tree view doesn't know about the extra text, it won't
// show the horizontal scrollbar if it goes off the right edge.
e.Text += " (" + e.Node.Name + ")";
// If the item height is larger than 35, wrap the text too
if(tvExtTree.ItemHeight > 35)
{
e.StringFormat.FormatFlags = StringFormatFlags.NoClip;
// Limit the text to the right edge of the node bounds. Note
// that this won't stop the tree view from showing a horizontal
// scrollbar.
e.TextBounds = new Rectangle(e.TextBounds.Left, e.NodeBounds.Top,
e.NodeBounds.Width - e.TextBounds.Left, e.NodeBounds.Height);
}
// NOTE:
// If you choose to draw one or more parts of the node, you should
// draw the background first, then the node parts, and then turn
// off the NodeParts.Background flag along with the other node part
// flags in the e.NodeParts property before returning.
}
