Change Treeview Link line style

[gyanendar]

Hi All,
Can it be possible to change the Treeview link line(line connecting parent & Child node) style.Default its coming as dotted line .I want to make it solid line.
I am using WIN-FORM.
Please suggest.

-Gyanendar

[Plater]

I think you would have to change the draw mode to owner draw and draw the lines yourself?

[gyanendar]

If i draw line by myself ,how i'll find the exact path along which line would be drawn? We can hide the treeview link and need to get the exact co-ordinate of the point of Parent & Child

[Plater]

Well getting one is easy with the DrawNode event.
Hmm I think I have an idea on how to draw the lines, i'll get back to you

[gyanendar]

Well getting one is easy with the DrawNode event.
Hmm I think I have an idea on how to draw the lines, i'll get back to you

Hi Plater,
Thanks for reply.
Here If we have the co-ordinate of points ,line can be drawn by e.Graphics.Draw line().

Gyanendar

[Plater]

Yeah I did the whole thing(sort of). I don't generally do the project, but this one caught my interest.

I do a few silly things to highlight what is going on, but it could certainly be adapted as needed.

[code=C#]

private void treeView1_DrawN ode(object sender, DrawTreeNodeEve ntArgs e)
{
bool isOSDrawn = e.DrawDefault;
Graphics g = e.Graphics;
TreeNode tn = e.Node;
Font DrawFont = treeView1.Font;
Brush ForeBrush = new SolidBrush(tree View1.ForeColor );
Brush BackGroundBrush = new SolidBrush(tree View1.BackColor );
Brush TextBackGroundB rush = BackGroundBrush ;
float baseX = e.Bounds.Left;
float baseY = e.Bounds.Top;
string stringToDraw = tn.Text;
bool hasParent = (tn.Parent != null);
bool hasNext = (tn.NextNode != null);
bool hasPrev = (tn.PrevNode != null);

float strX = baseX;
float strY = baseY;
float adjX = ((tn.Level + 1) * 24);
strX += adjX;

Rectangle UpLine = new Rectangle((int) (strX - 17), (int)(baseY), 2, 8);
Rectangle DownLine = new Rectangle((int) (strX - 17), (int)(baseY + 8), 2, 8);
Rectangle ChildBox = new Rectangle((int) (baseX - 16 + adjX + 2), (int)(baseY + 2), 12, 12);

float tailStartX = baseX - 16 + adjX + 2 + 12;
float tailStartY = baseY + 8;
if (e.Bounds.Width != 0)
{
if ((e.State & TreeNodeStates. Hot) == TreeNodeStates. Hot)
{//Hot tracking
DrawFont = new Font(DrawFont, FontStyle.Under line);
}
if ((e.State & TreeNodeStates. Selected) == TreeNodeStates. Selected)
{//change foregroudn/background
TextBackGroundB rush = new SolidBrush(Syst emColors.Inacti veBorder);
if (this.ActiveCon trol == sender)
{
ForeBrush = new SolidBrush(Syst emColors.Highli ghtText);
TextBackGroundB rush = new SolidBrush(Syst emColors.Highli ght);
}
}
//// Erase previous
g.FillRectangle (BackGroundBrus h, e.Bounds);
SizeF stringSize = g.MeasureString (stringToDraw, DrawFont, (int)(e.Bounds. Width - strX), new StringFormat(St ringFormatFlags .NoWrap));
//// Draw the "selected" background
g.FillRectangle (TextBackGround Brush, strX, strY, (float)Math.Flo or(stringSize.W idth), 16F);
//// Draw the text
g.DrawString(st ringToDraw, DrawFont, ForeBrush, strX, strY);

//// Every node gets a tail sticking out
g.FillRectangle (Brushes.Black, strX - 17, tailStartY, 16, 2);
///////////////////////////////////////////////////////////////////
if (hasPrev || hasParent) g.FillRectangle (Brushes.Black, UpLine);// Draw up line
if (hasNext) g.FillRectangle (Brushes.Black, DownLine);// Draw down line
//// Draw the "+" box
if (tn.Nodes.Count > 0)
{
g.FillRectangle (BackGroundBrus h, ChildBox);
if (!tn.IsExpanded ) g.FillRectangle (new SolidBrush(Colo r.Red), ChildBox);
g.DrawRectangle (Pens.Black, ChildBox);
}
}//end of valid draw region
}

[/code]