private void OnContentPanelPaint(object sender, PaintEventArgs e)
{
// Draw the nodes
int x = HorizontalSpace;
int y = VerticalSpace;
int horizontalOffset = _expanderWidth + HorizontalSpace;
if (_rootNodes.Count > 0)
{
Rectangle treeBounds = new Rectangle(0, 0, HorizontalSpace, VerticalSpace);
SmartTreeNode current = _rootNodes[0];
Rectangle smartTreeRect = RectangleToScreen(ClientRectangle);
smartTreeRect = _contentPanel.RectangleToClient(smartTreeRect);
while (current != null)
{
current.SetTreeView(this);
Rectangle contentArea = CalculateContentArea(x, y, current.GetContentSize());
if (contentArea.IntersectsWith(smartTreeRect))
{
PaintNode(current, e.Graphics, x, y);
}
treeBounds = Rectangle.Union(treeBounds, contentArea);
y += contentArea.Height + VerticalSpace;
if (current.IsExpanded &&
current.Nodes.Count > 0)
{
current = current.Nodes[0];
x += horizontalOffset;
}
else if (current.NextNode != null)
{
current = current.NextNode;
}
else
{
current = current.Parent;
x -= horizontalOffset;
while (current != null)
{
if (current.NextNode != null)
{
current = current.NextNode;
break;
}
else
{
current = current.Parent;
x -= horizontalOffset;
}
}
}
}
_contentPanel.Size = new Size(treeBounds.Width + 2 * HorizontalSpace, treeBounds.Height + VerticalSpace);
}
else
{
_contentPanel.Size = Size;
}
}
private void PaintNode(SmartTreeNode theNode, Graphics g, int locationX, int locationY) {
// Icon dimensions
int imageMidpointX = locationX + _expanderWidth / 2;
int imageMidpointY = locationY + (int) ( Font.SizeInPoints * 2 ) / 2;
// Node dimensions
Rectangle contentArea = CalculateContentArea(locationX, locationY, theNode.GetContentSize());
int nodeHeight = contentArea.Height;
int nodeBottom = locationY + nodeHeight;
// Update node bounds
theNode.Bounds = new Rectangle(locationX, locationY,
_expanderWidth + HorizontalSpace + contentArea.Width,
contentArea.Height);
// Draw lines
using( Pen pen = new Pen(LineColor) ) {
pen.DashStyle = DashStyle;
// Horizontal Line
g.DrawLine(pen, imageMidpointX,
imageMidpointY,
contentArea.Left, imageMidpointY);
Point verticalLineTop = new Point(imageMidpointX, imageMidpointY);
Point verticalLineBottom = verticalLineTop;
// Vertical line upwards
if( theNode.Parent != null || theNode.PreviousNode != null ) {
verticalLineTop = new Point(imageMidpointX, locationY - VerticalSpace);
}
// Vertical line downwards
if( theNode.NextNode != null ) {
verticalLineBottom = new Point(imageMidpointX, nodeBottom);
}
if( verticalLineTop != verticalLineBottom ) {
g.DrawLine(pen, verticalLineTop, verticalLineBottom);
}
}
// Draw plus and minus
if( theNode.Nodes.Count > 0 ) {
int imageLocationY = locationY + ( (int) ( Font.SizeInPoints * 2 ) - _expanderHeight ) / 2;
if( theNode.IsExpanded ) {
g.DrawImage(_expanderExpandedImage, locationX, imageLocationY);
}
else {
g.DrawImage(_expanderCollapsedImage, locationX, imageLocationY);
}
}
// draw the vertical dot line for the parent nodes if necessary
using( Pen pen = new Pen(LineColor) ) {
pen.DashStyle = DashStyle;
SmartTreeNode parentNode = theNode.Parent;
while( parentNode != null ) {
if( parentNode.NextNode != null ) {
int parentImageLocationX = parentNode.Bounds.X + _expanderWidth/2;
g.DrawLine(pen, parentImageLocationX,
locationY - VerticalSpace,
parentImageLocationX,
locationY + nodeHeight);
}
parentNode = parentNode.Parent;
}
}
// Draw checkbox:
if(theNode.HasCheckBox) {
int checkBoxLocationY = locationY + ( (int) ( Font.SizeInPoints * 2 ) - CheckBoxHeight ) / 2;
if( theNode.Checked ) {
CheckBoxRenderer.DrawCheckBox(g, new Point(contentArea.Left, checkBoxLocationY), CheckBoxState.CheckedNormal);
}
else {
CheckBoxRenderer.DrawCheckBox(g, new Point(contentArea.Left, checkBoxLocationY), CheckBoxState.UncheckedNormal);
}
// Update text area to account for the space needed by the checkbox:
contentArea = new Rectangle(contentArea.Left + CheckBoxWidth, contentArea.Top, contentArea.Width, contentArea.Height);
}
theNode.DrawContent(g, contentArea);
}
private void PaintNode(SmartTreeNode theNode, Graphics g, int locationX, int locationY)
{
// Icon dimensions
int imageMidpointX = locationX + _expanderWidth / 2;
int imageMidpointY = locationY + (int)(Font.SizeInPoints * 2) / 2;
// Node dimensions
Rectangle contentArea = CalculateContentArea(locationX, locationY, theNode.GetContentSize());
int nodeHeight = contentArea.Height;
int nodeBottom = locationY + nodeHeight;
// Update node bounds
theNode.Bounds = new Rectangle(locationX, locationY,
_expanderWidth + HorizontalSpace + contentArea.Width,
contentArea.Height);
// Draw lines
using (Pen pen = new Pen(LineColor)) {
pen.DashStyle = DashStyle;
// Horizontal Line
g.DrawLine(pen, imageMidpointX,
imageMidpointY,
contentArea.Left, imageMidpointY);
Point verticalLineTop = new Point(imageMidpointX, imageMidpointY);
Point verticalLineBottom = verticalLineTop;
// Vertical line upwards
if (theNode.Parent != null || theNode.PreviousNode != null)
{
verticalLineTop = new Point(imageMidpointX, locationY - VerticalSpace);
}
// Vertical line downwards
if (theNode.NextNode != null)
{
verticalLineBottom = new Point(imageMidpointX, nodeBottom);
}
if (verticalLineTop != verticalLineBottom)
{
g.DrawLine(pen, verticalLineTop, verticalLineBottom);
}
}
// Draw plus and minus
if (theNode.Nodes.Count > 0)
{
int imageLocationY = locationY + ((int)(Font.SizeInPoints * 2) - _expanderHeight) / 2;
if (theNode.IsExpanded)
{
g.DrawImage(_expanderExpandedImage, locationX, imageLocationY);
}
else
{
g.DrawImage(_expanderCollapsedImage, locationX, imageLocationY);
}
}
// draw the vertical dot line for the parent nodes if necessary
using (Pen pen = new Pen(LineColor)) {
pen.DashStyle = DashStyle;
SmartTreeNode parentNode = theNode.Parent;
while (parentNode != null)
{
if (parentNode.NextNode != null)
{
int parentImageLocationX = parentNode.Bounds.X + _expanderWidth / 2;
g.DrawLine(pen, parentImageLocationX,
locationY - VerticalSpace,
parentImageLocationX,
locationY + nodeHeight);
}
parentNode = parentNode.Parent;
}
}
// Draw checkbox:
if (theNode.HasCheckBox)
{
int checkBoxLocationY = locationY + ((int)(Font.SizeInPoints * 2) - CheckBoxHeight) / 2;
if (theNode.Checked)
{
CheckBoxRenderer.DrawCheckBox(g, new Point(contentArea.Left, checkBoxLocationY), CheckBoxState.CheckedNormal);
}
else
{
CheckBoxRenderer.DrawCheckBox(g, new Point(contentArea.Left, checkBoxLocationY), CheckBoxState.UncheckedNormal);
}
// Update text area to account for the space needed by the checkbox:
contentArea = new Rectangle(contentArea.Left + CheckBoxWidth, contentArea.Top, contentArea.Width, contentArea.Height);
}
theNode.DrawContent(g, contentArea);
}