/// <summary>
/// MaxLevel
/// </summary>
/// <param name="list">The list.</param>
/// <returns></returns>
protected virtual int MaxLevel(SitemapItems list)
{
int level = 0;
for (int i = 0; i < list.Count; ++i)
{
if (list[i].NestLevel > level)
{
level = list[i].NestLevel;
}
}
return(level);
}
/// <summary>
/// Returns true if node is last node for the current branch on that level
/// </summary>
/// <param name="index">The index.</param>
/// <param name="list">The list.</param>
/// <returns></returns>
protected virtual bool LastItemAtLevel(int index, SitemapItems list)
{
int level = list[index].NestLevel;
for (int i = index + 1; i < list.Count; ++i)
{
if (list[i].NestLevel < level)
{
return(true);
}
if (list[i].NestLevel == level)
{
return(false);
}
}
return(true);
}
/// <summary>
/// Render
/// This function creates a treeview in a table from the SitemapItems list
/// </summary>
/// <param name="list"></param>
/// <returns></returns>
public virtual WebControl Render(SitemapItems list)
{
//init table with a width of 98%
Table t = new Table();
t.Width = TableWidth;
t.BorderWidth = 0;
t.CellSpacing = 0;
t.CellPadding = 0;
int cols = MaxLevel(list) + 2;
// an array of chars is used to determine what images to show on each row
// the chars have the following meaning:
// + --> crossed line
// | --> straight line
// \ --> line for last node on branch
// N --> node
// R --> root node
// S --> space
char[] strRow = new char[cols];
//init row to spaces
for (int i = 0; i < cols; ++i)
{
strRow[i] = 'S';
}
for (int i = 0; i < list.Count; ++i)
{
// replace the cross of the previous row in a straight line on the current row
// do the same for last_node_line and Spaces
for (int j = 0; j < cols; ++j)
{
if (strRow[j] == '+')
{
strRow[j] = '|';
}
if (strRow[j] == '\\')
{
strRow[j] = 'S';
}
}
// show a root node image if nestlevel = 0
if (list[i].NestLevel == 0)
{
strRow[list[i].NestLevel] = 'R';
}
else
{
strRow[list[i].NestLevel] = 'N';
}
//everything after the node can be replaces by spaces
for (int j = list[i].NestLevel + 1; j < cols; ++j)
{
strRow[j] = ' ';
}
// show no lines before the node when it's a root node
if (list[i].NestLevel > 0)
{
if (LastItemAtLevel(i, list))
{
//if it's the last node at that level of the current branch,
//show a last node line
strRow[list[i].NestLevel - 1] = '\\';
}
else
{
//else show a crossed line
strRow[list[i].NestLevel - 1] = '+';
}
}
// the images are determined in the char array, now make a TableRow from it
TableRow r = new TableRow();
TableCell c;
//only use the char array till the node
for (int j = 0; j <= list[i].NestLevel; ++j)
{
c = new TableCell();
Image img = new Image();
img.BorderWidth = 0;
img.Width = ImagesWidth;
img.Height = ImagesHeight;
c.Width = ImagesWidth;
//what image to use
switch (strRow[j])
{
case '+':
img.ImageUrl = ImageCrossedLineUrl;
break;
case '\\':
img.ImageUrl = ImageLastNodeLineUrl;
break;
case '|':
img.ImageUrl = ImageStraightLineUrl;
break;
case 'S':
img.ImageUrl = ImageSpacerUrl;
break;
case 'N':
img.ImageUrl = ImageNodeUrl;
break;
case 'R':
img.ImageUrl = ImageRootNodeUrl;
break;
}
c.Controls.Add(img);
r.Cells.Add(c);
}
// the images are done for this row, now make the hyperlink
c = new TableCell();
//make sure it fills the all the space left
c.Width = new Unit(100, UnitType.Percentage);
c.ColumnSpan = cols - 1 - list[i].NestLevel;
Literal lit = new Literal();
lit.Text = " ";
c.Controls.Add(lit);
HyperLink l = new HyperLink();
l.Text = list[i].Name;
l.NavigateUrl = list[i].Url;
l.CssClass = CssStyle;
//row is done and add everything to the table
c.Controls.Add(l);
r.Cells.Add(c);
t.Rows.Add(r);
}
return(t);
}