TreeView.GetNodeAt problem

[Alan T]

I have a dragdrop event to capture the treenode that trigger that event.
However, I always get the returned node is null.

private void trvEmployee_DragDrop(object sender, DragEventArgs e)

{
TreeNode targetNode;

MessageBox.Show(e.X.ToString + " -- " + e.Y.ToString());
targetNode = trvEmployee.GetNodeAt(e.X, e.Y);
if (targetNode == null)
{ MessageBox.Show(" null");
}
else
{ MessageBox.Show(target.Text);
}
}

I don't know why it showed the e.X and e.Y have valid values but the
targetNode is null.

However, if I hardcode the
targetNode = trvEmployee.GetNodeAt(e.X, e.Y);
to e.X and e.Y to some value, it showed the node.
Note, the AllowDrop perperty has been set to true already.

[Michael]

When you receive your coordinates, they're actually with respect to the
screen. For you treeview to understand you need to change them to the
"client" equvalent.

Point newPoint = treeView1.PointToClient( new Point(e.X, e.Y));

MessageBox.Show(e.X.ToString() + " -- " + e.Y.ToString());

targetNode = treeView1.GetNodeAt(newPoint.X, newPoint.Y);

if (targetNode == null)

Mike

http://www.seeknsnatch.com

"Alan T" <al*************@yahoo.com.auwrote in message
news:e0**************@TK2MSFTNGP04.phx.gbl...

>I have a dragdrop event to capture the treenode that trigger that event.
However, I always get the returned node is null.

private void trvEmployee_DragDrop(object sender, DragEventArgs e)

{
TreeNode targetNode;

MessageBox.Show(e.X.ToString + " -- " + e.Y.ToString());
targetNode = trvEmployee.GetNodeAt(e.X, e.Y);
if (targetNode == null)
{ MessageBox.Show(" null");
}
else
{ MessageBox.Show(target.Text);
}
}

I don't know why it showed the e.X and e.Y have valid values but the
targetNode is null.

However, if I hardcode the
targetNode = trvEmployee.GetNodeAt(e.X, e.Y);
to e.X and e.Y to some value, it showed the node.
Note, the AllowDrop perperty has been set to true already.

[Alan T]

Hi thanks.
I tried using one statement:
targetNode = treeView1.GetNodeAt(newPoint(e.X, e.Y));

Is there any differences from yours ?
"Michael" <in**@seeknsnatch.comwrote in message
news:44***********************@news.free.fr...

When you receive your coordinates, they're actually with respect to the
screen. For you treeview to understand you need to change them to the
"client" equvalent.

Point newPoint = treeView1.PointToClient( new Point(e.X, e.Y));

MessageBox.Show(e.X.ToString() + " -- " + e.Y.ToString());

targetNode = treeView1.GetNodeAt(newPoint.X, newPoint.Y);

if (targetNode == null)

Mike

http://www.seeknsnatch.com

"Alan T" <al*************@yahoo.com.auwrote in message
news:e0**************@TK2MSFTNGP04.phx.gbl...

>>I have a dragdrop event to capture the treenode that trigger that event.
However, I always get the returned node is null.

private void trvEmployee_DragDrop(object sender, DragEventArgs e)

{
TreeNode targetNode;

MessageBox.Show(e.X.ToString + " -- " + e.Y.ToString());
targetNode = trvEmployee.GetNodeAt(e.X, e.Y);
if (targetNode == null)
{ MessageBox.Show(" null");
}
else
{ MessageBox.Show(target.Text);
}
}

I don't know why it showed the e.X and e.Y have valid values but the
targetNode is null.

However, if I hardcode the
targetNode = trvEmployee.GetNodeAt(e.X, e.Y);
to e.X and e.Y to some value, it showed the node.
Note, the AllowDrop perperty has been set to true already.

[Michael]

yeah, you need this

Point newPoint = treeView1.PointToClient( new Point(e.X, e.Y));

Mike
http://www.seeknsnatch.com

"Alan T" <al*************@yahoo.com.auwrote in message
news:um**************@TK2MSFTNGP06.phx.gbl...

Hi thanks.
I tried using one statement:
targetNode = treeView1.GetNodeAt(newPoint(e.X, e.Y));

Is there any differences from yours ?
"Michael" <in**@seeknsnatch.comwrote in message
news:44***********************@news.free.fr...

>When you receive your coordinates, they're actually with respect to the
screen. For you treeview to understand you need to change them to the
"client" equvalent.

Point newPoint = treeView1.PointToClient( new Point(e.X, e.Y));

MessageBox.Show(e.X.ToString() + " -- " + e.Y.ToString());

targetNode = treeView1.GetNodeAt(newPoint.X, newPoint.Y);

if (targetNode == null)

Mike

http://www.seeknsnatch.com

"Alan T" <al*************@yahoo.com.auwrote in message
news:e0**************@TK2MSFTNGP04.phx.gbl...

>>>I have a dragdrop event to capture the treenode that trigger that event.
However, I always get the returned node is null.

private void trvEmployee_DragDrop(object sender, DragEventArgs e)

{
TreeNode targetNode;

MessageBox.Show(e.X.ToString + " -- " + e.Y.ToString());
targetNode = trvEmployee.GetNodeAt(e.X, e.Y);
if (targetNode == null)
{ MessageBox.Show(" null");
}
else
{ MessageBox.Show(target.Text);
}
}

I don't know why it showed the e.X and e.Y have valid values but the
targetNode is null.

However, if I hardcode the
targetNode = trvEmployee.GetNodeAt(e.X, e.Y);
to e.X and e.Y to some value, it showed the node.
Note, the AllowDrop perperty has been set to true already.

[Alan T]

Thanks Michael.
It works.

I missed this critical statement as you mentioned.
"Michael" <in**@seeknsnatch.comwrote in message
news:44***********************@news.free.fr...

yeah, you need this

Point newPoint = treeView1.PointToClient( new Point(e.X, e.Y));

Mike
http://www.seeknsnatch.com

"Alan T" <al*************@yahoo.com.auwrote in message
news:um**************@TK2MSFTNGP06.phx.gbl...

>Hi thanks.
I tried using one statement:
targetNode = treeView1.GetNodeAt(newPoint(e.X, e.Y));

Is there any differences from yours ?
"Michael" <in**@seeknsnatch.comwrote in message
news:44***********************@news.free.fr...

>>When you receive your coordinates, they're actually with respect to the
screen. For you treeview to understand you need to change them to the
"client" equvalent.

Point newPoint = treeView1.PointToClient( new Point(e.X, e.Y));

MessageBox.Show(e.X.ToString() + " -- " + e.Y.ToString());

targetNode = treeView1.GetNodeAt(newPoint.X, newPoint.Y);

if (targetNode == null)

Mike

http://www.seeknsnatch.com

"Alan T" <al*************@yahoo.com.auwrote in message
news:e0**************@TK2MSFTNGP04.phx.gbl...
I have a dragdrop event to capture the treenode that trigger that
event.
However, I always get the returned node is null.

private void trvEmployee_DragDrop(object sender, DragEventArgs e)

{
TreeNode targetNode;

MessageBox.Show(e.X.ToString + " -- " + e.Y.ToString());
targetNode = trvEmployee.GetNodeAt(e.X, e.Y);
if (targetNode == null)
{ MessageBox.Show(" null");
}
else
{ MessageBox.Show(target.Text);
}
}

I don't know why it showed the e.X and e.Y have valid values but the
targetNode is null.

However, if I hardcode the
targetNode = trvEmployee.GetNodeAt(e.X, e.Y);
to e.X and e.Y to some value, it showed the node.
Note, the AllowDrop perperty has been set to true already.