// Invalidate from startNode down.
internal void InvalidateDown(TreeNode startNode)
{
if (updating > 0 || this.nodes == null)
{
return;
}
// Find the position of startNode relative to the top node.
int nodeFromTop = -1;
TreeView.NodeEnumerator nodes = new TreeView.NodeEnumerator(this.nodes);
while (nodes.MoveNext())
{
if (nodes.currentNode == topNode)
{
// We are at the top of the control.
nodeFromTop = 0;
}
if (nodes.currentNode == startNode)
{
break;
}
if (nodeFromTop >= 0)
{
nodeFromTop++;
}
}
// Calculate the y position of startNode.
int y = nodeFromTop * ItemHeight;
// Invalidate from this position down.
// Start one pixel higher to cover the focus rectangle.
Invalidate(new Rectangle(0, y - 1, ClientRectangle.Width, ClientRectangle.Height - y + 1));
}
public Rectangle GetNodeBounds(TreeNode node)
{
if (node.parent != null)
{
int nodeFromTop = -1;
TreeView.NodeEnumerator nodes = new TreeView.NodeEnumerator(this.nodes);
while (nodes.MoveNext())
{
if (nodes.currentNode == topNode)
{
// We are at the top of the control.
nodeFromTop = 0;
}
if (nodes.currentNode == node)
{
using(Graphics g = CreateGraphics())
{
return GetTextBounds(g, node, nodeFromTop, nodes.level);
}
}
if (nodeFromTop >= 0)
{
nodeFromTop++;
}
}
}
return Rectangle.Empty;
}
public TreeNode GetNodeAt(int x, int y)
{
int height = ItemHeight;
int nodeFromTop = -1;
TreeView.NodeEnumerator nodes = new TreeView.NodeEnumerator(this.nodes);
while (nodes.MoveNext())
{
if (nodes.currentNode == topNode)
{
// We are now at the top of the control.
nodeFromTop = 1;
}
if (nodeFromTop > -1)
{
if (y < height * nodeFromTop)
{
return nodes.currentNode;
}
nodeFromTop++;
}
}
return null;
}
private void vScrollBar_ValueChanged(object sender, EventArgs e)
{
int nodeFromTop = 0;
TreeView.NodeEnumerator nodes = new TreeView.NodeEnumerator(this.nodes);
while (nodes.MoveNext())
{
if (nodeFromTop == vScrollBar.Value)
{
topNode = nodes.currentNode;
Invalidate();
return;
}
nodeFromTop++;
}
}
void ProcessClick(int x, int y, bool rightMouse, ClickEvent clickEvent)
{
int nodeFromTop = -1;
int height = ItemHeight;
using(Graphics g = CreateGraphics())
{
// Iterate through all the nodes, looking for the bounds that match.
TreeView.NodeEnumerator nodes = new TreeView.NodeEnumerator(this.nodes);
while (nodes.MoveNext())
{
if (nodes.currentNode == topNode)
{
// We are now at the top of the control.
nodeFromTop = 0;
}
if (nodeFromTop > -1)
{
// Check if the y matches this node.
if (y < height * (nodeFromTop + 1))
{
bool allowEdit = false;
bool allowSelect = true;
// Raise click or double click when called from MouseUp
if(clickEvent == ClickEvent.Click)
{
OnClick(EventArgs.Empty);
}
else if(clickEvent == ClickEvent.DoubleClick)
{
OnDoubleClick(EventArgs.Empty);
}
// Clicking the image can be used to select.
if (imageList == null || !GetImageBounds(nodeFromTop, nodes.level).Contains(x, y))
{
// Clicking the text can be used to edit and select.
// if false then the hierarchy marker must have been clicked.
if (GetTextBounds(g, nodes.currentNode, nodeFromTop, nodes.level).Contains(x, y))
{
allowEdit = true;
}
else
{
allowSelect = false;
}
}
if (SelectedNode == nodes.Current && mouseClickTimer != null && mouseClickTimer.Enabled && (allowEdit || allowSelect))
{
mouseClickTimer.Stop();
nodeToEdit = null;
nodes.currentNode.Toggle();
return;
}
if (allowSelect || rightMouse)
{
if (selectedNode == nodes.Current)
{
if (labelEdit && allowEdit && !rightMouse)
{
nodeToEdit = nodes.currentNode;
}
}
else
{
nodeToEdit = null;
// Do the events.
TreeViewCancelEventArgs eventArgs = new TreeViewCancelEventArgs(nodes.currentNode, false, TreeViewAction.ByMouse);
OnBeforeSelect(eventArgs);
if (!eventArgs.Cancel)
{
SelectedNode = nodes.currentNode;
OnAfterSelect(new TreeViewEventArgs(nodes.currentNode));
Focus();
}
}
if (rightMouse)
{
return;
}
if (mouseClickTimer == null)
{
mouseClickTimer = new Timer();
mouseClickTimer.Tick +=new EventHandler(mouseClickTimer_Tick);
mouseClickTimer.Interval = mouseEditTimeout;
}
mouseClickTimer.Start();
break;
}
}
nodeFromTop++;
}
}
}
}
// Non Microsoft member.
protected override void OnMouseDown(MouseEventArgs e)
{
nodeToEdit = null;
if (e.Button == MouseButtons.Left)
{
int nodeFromTop = -1;
// Iterate through all the nodes, looking for the bounds that match.
TreeView.NodeEnumerator nodes = new TreeView.NodeEnumerator(this.nodes);
while (nodes.MoveNext())
{
if (nodes.currentNode == topNode)
{
// We are now at the top of the control.
nodeFromTop = 0;
}
if (nodeFromTop > -1)
{
if (GetExpanderBounds(nodeFromTop, nodes.level).Contains(e.X, e.Y))
{
nodes.currentNode.Toggle();
break;
}
else if (GetCheckBounds(nodeFromTop, nodes.level).Contains(e.X, e.Y))
{
TreeViewCancelEventArgs args = new TreeViewCancelEventArgs(nodes.currentNode, false, TreeViewAction.ByMouse);
OnBeforeCheck(args);
if (!args.Cancel)
{
nodes.currentNode.isChecked = !nodes.currentNode.isChecked;
OnAfterCheck(new TreeViewEventArgs(nodes.currentNode, TreeViewAction.ByMouse));
}
Invalidate(GetCheckBounds(nodeFromTop, nodes.level));
break;
}
nodeFromTop++;
}
}
}
else
{
ProcessClick(e.X, e.Y, true, ClickEvent.None);
}
base.OnMouseDown (e);
}