/// <summary>
/// 新建连接线后的链路校验。
/// 缺省的检验是：如果形成闭合循环，则返回 false，否则返回 true
/// </summary>
protected virtual bool CheckValid(ItemLink link, CustomItemNode node)
{
if (NodeInPrevRouting(link, node))
{
MessageBox.Show(
"当前流程不支持闭合循环！",
"链路错误",
MessageBoxButtons.OK,
MessageBoxIcon.Error);
return(false);
}
else
{
return(true);
}
}
/// <summary>
/// 检查指定的结点是否是当前连接线的起始结点
/// </summary>
protected virtual bool NodeInPrevRouting(ItemLink link, CustomItemNode node)
{
if (link.ItemFrom == node)
{
return(true);
}
else
{
foreach (ItemLink prevLink in link.ItemFrom.PrevLinks)
{
if (NodeInPrevRouting(prevLink, node))
{
return(true);
}
}
}
return(false);
}
protected virtual void AfterSetItemTo(CustomItemNode item)
{
if (item is ItemNode)
{
if (ItemFrom is ItemBegin)
{
(item as ItemNode).Level = 1;
ResetNextLevel();
}
else
{
int level = (ItemFrom as ItemNode).Level + 1;
if (level > (item as ItemNode).Level)
{
(item as ItemNode).Level = level;
ResetNextLevel();
}
}
}
}
private void ResetItemPoint(CustomItemNode item, Point location)
{
int itemHorizontalSplitter = 150;
int itemVerticalSplitter = 100;
if (item.LayoutResetted)
{
item.ItemLocate = location;
item.LayoutResetted = false;
}
int i = 1;
foreach (ItemLink line in item.NextLinks)
{
Point nextLoation =
new Point(
location.X + itemHorizontalSplitter,
location.Y);
ResetItemPoint(line.ItemTo, nextLoation);
location.Y = item.ToPoint.Y * i++ + itemVerticalSplitter;
}
}
protected virtual void AfterSetItemFrom(CustomItemNode item)
{
}
