/// <summary>
/// Construct a ListBox instance from the given template.
/// </summary>
/// <param name="template"></param>
public TreeView(TreeViewTemplate template)
: base(template)
{
_items = template.Items;
Title = template.Title ?? "";
CurrentSelected = -1;
OwnerDraw = template.OwnerDraw;
if (this.Size.Width < 3 || this.Size.Height < 3)
{
template.HasFrameBorder = false;
}
HasFrame = template.HasFrameBorder;
_useSmallVersion = template.FrameTitle;
HilightWhenMouseOver = template.HilightWhenMouseOver;
CanHaveKeyboardFocus = template.CanHaveKeyboardFocus;
LabelAlignment = template.LabelAlignment;
TitleAlignment = template.TitleAlignment;
CurrentSelected = template.InitialSelectedIndex;
_mouseOverIndex = -1;
// Queue<TreeNode> nodesToProcess = new Queue<TreeNode>();
_nodeCount = 0;
foreach (var node in _items)
{
NavigateNodes(node, n => _nodeCount++);
}
// foreach (var node in Items)
// nodesToProcess.Enqueue(node);
//
// while (nodesToProcess.Count > 0) {
// var treeNode = nodesToProcess.Dequeue();
//
// if (treeNode.HasChildren)
// foreach (var node in treeNode.Nodes)
// nodesToProcess.Enqueue(node);
//
// nodeCount++;
// }
_currNumberOfItemsDisplay = _nodeCount;
CalcMetrics(template);
}
private void CalcMetrics(TreeViewTemplate template)
{
int numItems = _nodeCount;
int expandTitle = 0;
int delta = Size.Height - numItems - 1;
if (template.HasFrameBorder)
{
if (template.FrameTitle)
{
delta -= 1;
}
else
{
delta -= 3;
}
}
_numberItemsDisplayed = _nodeCount;
if (delta < 0)
{
_numberItemsDisplayed += delta;
}
else if (delta > 0)
{
expandTitle = delta;
}
int titleWidth = Size.Width;
int titleHeight = 1 + expandTitle;
if (Title != "")
{
if (template.HasFrameBorder)
{
_titleRect = new Rectangle(Point.One,
new Size(titleWidth - 2, titleHeight));
}
else
{
_titleRect = new Rectangle(Point.Origin,
new Size(titleWidth, titleHeight));
}
}
int itemsWidth = Size.Width;
int itemsHeight = _numberItemsDisplayed;
if (template.HasFrameBorder)
{
if (template.FrameTitle)
{
_itemsRect = new Rectangle(Point.One, new Size(itemsWidth - 2, itemsHeight));
}
else
{
_itemsRect = new Rectangle(_titleRect.BottomLeft.Shift(0, 1), new Size(itemsWidth - 2, itemsHeight));
}
}
else
{
_itemsRect = new Rectangle(_titleRect.BottomLeft,
new Size(itemsWidth, itemsHeight));
}
}
