public Facade(ITree <int> tree, ITreePrinter <int> treeViewer, ITreeFinder <int> treeFinder, ILeafRemover <int> leafRemover)
{
Tree = tree ?? throw new ArgumentNullException("Tree can't be null!!!");
TreeViewer = treeViewer ?? throw new ArgumentNullException("TreeViewer can't be null!!!");
Finder = treeFinder ?? throw new ArgumentNullException("TreeFinder can't be null");
LeafRemover = leafRemover ?? throw new ArgumentNullException("LeafRemover can't be null");
}
public void View(ITreePrinter <T> treePrinter) => treePrinter.PrintTree(this);
//For Category tree and ICategory related types navigate and display
public ICategory Navigate(IList <T> tree, IKeyReader reader, ITreePrinter <T> printer,
bool autoExpandChildren)
{
List <T> sortedTree = (List <T>)tree;
sortedTree.Sort((x, y) => x.Id - y.Id);
T currentCategory = tree[0];
var neighbors = tree.Where(x => x.ParentId == currentCategory.Id).ToArray();
int parentId = 0;
int horizontal = 0;
sortedTree[0].Active = true; //Highlight root category
currentCategory.Visible = true;
printer.PrintTree(sortedTree);
while (true)
{
Destination destination = reader.GetDestination();
if (destination == Destination.MoveDown)
{
if (currentCategory.ParentId == 0) // if top category move down opens childs
{
foreach (var id in neighbors)
{
sortedTree[id.Id - 1].Visible = true; //all Id in sorted list == index + 1
}
parentId = currentCategory.ParentId;
}
else
{
SwitchCategory(false, currentCategory, sortedTree, autoExpandChildren);
if (parentId != 0 && neighbors.Length > horizontal + 1) //can we move down?
{
horizontal++;
currentCategory = neighbors[horizontal];
}
}
}
else if (destination == Destination.MoveUp)
{
SwitchCategory(false, currentCategory, sortedTree, autoExpandChildren);
if (0 <= horizontal - 1)
{
horizontal--;
if (parentId != 0)
{
currentCategory = neighbors[horizontal];
}
}
}
else if (destination == Destination.MoveRight)
{
SwitchCategory(false, currentCategory, sortedTree, autoExpandChildren);
var children = tree.Where(x => x.ParentId == currentCategory.Id).ToArray();
if (children.Length != 0)
{
horizontal = 0;
parentId = currentCategory.Id;
currentCategory = children[horizontal];
neighbors = tree.Where(x => x.ParentId == parentId).ToArray();
foreach (var id in neighbors)
{
sortedTree[id.Id - 1].Visible = true;
}
}
}
else if (destination == Destination.MoveLeft)
{
if (currentCategory.ParentId != 0)
{
SwitchCategory(false, currentCategory, sortedTree, autoExpandChildren);
if (parentId != 0)
{
foreach (var id in neighbors)
{
sortedTree[id.Id - 1].Visible = false;
}
currentCategory = sortedTree[currentCategory.ParentId - 1];
}
parentId = currentCategory.ParentId;
neighbors = tree.Where(x => x.ParentId == parentId).ToArray();
if (parentId != 0)
{
horizontal = Array.IndexOf(neighbors, currentCategory);
}
}
}
else if (destination == Destination.Select)
{
ResetActive(tree, currentCategory);
return(currentCategory);
}
else if (destination == Destination.Esc)
{
ResetActive(sortedTree, currentCategory);
HideAllCategories(sortedTree);
printer.ClearView(sortedTree);
return(null);
}
SwitchCategory(true, currentCategory, sortedTree, autoExpandChildren);
printer.ClearView(sortedTree);
printer.PrintTree(sortedTree);
}
}
