private void AddReverseConnection(ConnectingRectangleViewModel source, ConnectingRectangleViewModel destination)
{
var sourceLetter = source.Letter;
var destinationLetter = destination.Letter;
if (sourceLetter != destinationLetter)
{
ConnectingAlphabetViewModel sourceAlphabet, destinationAlphabet;
if (TopAlphabet.ConnectingRectangles.Contains(source))
{
sourceAlphabet = TopAlphabet;
destinationAlphabet = BottomAlphabet;
}
else
{
sourceAlphabet = BottomAlphabet;
destinationAlphabet = TopAlphabet;
}
var reverseSourceLetter = sourceAlphabet.ConnectingRectangles.Single(x => x.Letter == destinationLetter);
var reverseDestinationLetter = destinationAlphabet.ConnectingRectangles.Single(x => x.Letter == sourceLetter);
var line = AddLine(reverseSourceLetter, reverseDestinationLetter);
AddNewConnection(reverseSourceLetter, reverseDestinationLetter, line);
}
}
public void Handle(RectangleClickMessage message)
{
var rectangle = message.Rectangle;
if (!_isConnecting)
{
_isConnecting = true;
_sourceRectangle = rectangle;
if (_sourceRectangle.IsConnected)
{
RemoveExistingConnection(_sourceRectangle);
}
StartDrawingLine(_sourceRectangle);
}
else
{
_isConnecting = false;
_destinationRectangle = rectangle;
if (ConnectionNotPossible(rectangle))
{
CancelDrawingLine();
return;
}
if (_destinationRectangle.IsConnected)
{
RemoveExistingConnection(_destinationRectangle);
}
AddConnection(_sourceRectangle, _destinationRectangle, _line);
}
}
private void FinishDrawingLine(ConnectingRectangleViewModel rectangle)
{
var endPosition = GetAnchorPoint(rectangle);
_line.SetEndPoint(endPosition);
View.MouseMove -= View_MouseMove;
}
private void AddNewConnection(ConnectingRectangleViewModel source, ConnectingRectangleViewModel destination, Line line)
{
var connection = _factory.CreateConnection(source, destination, line);
_connections.Add(connection);
_plugboardController.AddPlugboardConnection(connection.From, connection.To);
}
private Point GetAnchorPoint(ConnectingRectangleViewModel rectangle)
{
var view = rectangle.View;
var width = view.Width;
var height = view.Height;
var middlePoint = new Point(width / 2, height / 2);
return(view.TranslatePoint(middlePoint, Grid));
}
private void StartDrawingLine(ConnectingRectangleViewModel rectangle)
{
var startPosition = GetAnchorPoint(rectangle);
_line = DrawerHelper.GetLine(startPosition, startPosition, isHitTestVisible: false);
AddLineToGrid(_line);
View.MouseMove += View_MouseMove;
}
private Line AddLine(ConnectingRectangleViewModel source, ConnectingRectangleViewModel destination)
{
var startPosition = GetAnchorPoint(source);
var endPosition = GetAnchorPoint(destination);
var line = DrawerHelper.GetLine(startPosition, endPosition, isHitTestVisible: false);
AddLineToGrid(line);
return(line);
}
private void RemoveExistingConnection(ConnectingRectangleViewModel rectangle)
{
var letter = rectangle.Letter;
var connection = _connections.Single(con => con.SourceRectangle.Letter == letter);
var reverseConnection = _connections.Single(con => con.DestinationRectangle.Letter == letter);
RemoveConnection(connection);
RemoveConnection(reverseConnection);
void RemoveConnection(RectangleConnection con)
{
con.Clear();
var line = con.ConnectingLine;
Grid.Children.Remove(line);
_connections.Remove(con);
_plugboardController.RemovePlugboardConnection(con.From, con.To);
}
}
private void AddConnection(ConnectingRectangleViewModel source, ConnectingRectangleViewModel destination, Line line)
{
FinishDrawingLine(destination);
AddNewConnection(source, destination, line);
AddReverseConnection(source, destination);
}
/// <summary>
/// Checks if destination rectangle is from different collection than source rectangle
/// </summary>
/// <param name="rectangle"></param>
/// <returns></returns>
private bool ConnectionNotPossible(ConnectingRectangleViewModel rectangle)
{
return(TopAlphabet.ConnectingRectangles.Contains(_sourceRectangle) && TopAlphabet.ConnectingRectangles.Contains(rectangle) ||
BottomAlphabet.ConnectingRectangles.Contains(_sourceRectangle) && BottomAlphabet.ConnectingRectangles.Contains(rectangle));
}
