/// <summary>
/// 计算线的起点
/// </summary>
/// <param name="p_node"></param>
/// <returns></returns>
LinkPortPosition CaclStart(FrameworkElement p_node)
{
double left = Canvas.GetLeft(p_node);
double top = Canvas.GetTop(p_node);
double right = left + p_node.Width;
double bottom = top + p_node.Height;
Dictionary <LinkPortPosition, Point> dictPt = new Dictionary <LinkPortPosition, Point>();
dictPt.Add(LinkPortPosition.LeftTop, new Point(left, top));
dictPt.Add(LinkPortPosition.TopCenter, new Point(left + p_node.Width / 2, top));
dictPt.Add(LinkPortPosition.RightTop, new Point(right, top));
dictPt.Add(LinkPortPosition.RightCenter, new Point(right, top + p_node.Height / 2));
dictPt.Add(LinkPortPosition.RightBottom, new Point(right, bottom));
dictPt.Add(LinkPortPosition.BottomCenter, new Point(left + p_node.Width / 2, bottom));
dictPt.Add(LinkPortPosition.LeftBottom, new Point(left, bottom));
dictPt.Add(LinkPortPosition.LeftCenter, new Point(left, top + p_node.Height / 2));
Point ptCur = new Point(_line.X2, _line.Y2);
LinkPortPosition startPos = LinkPortPosition.RightBottom;
double distance = double.MaxValue;
foreach (LinkPortPosition pos in dictPt.Keys)
{
double dis = GetDistance(ptCur, dictPt[pos]);
if (dis < distance)
{
distance = dis;
startPos = pos;
}
}
//更改开始位置
_line.X1 = dictPt[startPos].X;
_line.Y1 = dictPt[startPos].Y;
return(startPos);
}
/// <summary>
/// 无指向的线（将被删除）的线移动参数构造函数
/// </summary>
/// <param name="p_line"></param>
/// <param name="p_isHeadNode"></param>
/// <param name="p_oldNode"></param>
/// <param name="p_oldPos"></param>
public LineMoveCmdArgs(SLine p_line, bool p_isHeadNode, SNode p_oldNode, LinkPortPosition p_oldPos)
{
_line = p_line;
_isHeadNode = p_isHeadNode;
_oldNode = p_oldNode;
_oldPos = p_oldPos;
}
void OnLinkDragCompleted(object sender, DragCompletedEventArgs e)
{
SNode curNode = _owner.SelectionClerk.Selection[0] as SNode;
LinkPortPosition startPos = CaclStart(curNode);
Rect thumbRect = new Rect(Canvas.GetLeft(_thumb), Canvas.GetTop(_thumb), _thumb.ActualWidth, _thumb.ActualHeight);
if (_owner.IsValidRegion(thumbRect))
{
SNode tagNode = _owner.GetFirstIntersect(thumbRect);
if (tagNode != null)
{
//是否存在连接
bool isHas = (from obj in _owner.Container.Children
let line = obj as SLine
where line != null && line.HeaderID == curNode.ID && line.TailID == tagNode.ID
select line).Any();
if (!isHas)
{
SLine line = new SLine(_owner);
line.HeaderID = curNode.ID;
line.HeaderPort = startPos;
line.TailID = tagNode.ID;
line.TailPort = _owner.GetLinkPosition(tagNode, thumbRect);
_owner.Insert(line);
_owner.SelectionClerk.SelectLine(line);
_owner.RefreshLinkLines(tagNode);
}
}
}
//还原默认位置
Canvas.SetLeft(_thumb, _thumbX);
Canvas.SetTop(_thumb, _thumbY);
_line.Visibility = Visibility.Collapsed;
_owner.LinkThumbEnd();
}
/// <summary>
/// 设置有效点
/// </summary>
/// <param name="p_pos"></param>
public void SetValidPos(LinkPortPosition p_pos)
{
VisualStateManager.GoToState(this, p_pos.ToString(), true);
}
