/// <summary>
/// 删除图元
/// </summary>
/// <param name="graphElement">要删除的图元</param>
/// <return>是否删除成功</return>
protected bool DeleteGraphElement(GraphElement graphElement)
{
GraphManager graphManager = data as GraphManager;
DataManager dataManager = graphManager.CurrentFlowChartManager.CurrentDataManager;
List <GraphElement> list = new List <GraphElement>(); // 记录遍历过图元的链表
bool deleteSuccess = false; // 是否删除成功
if (graphElement is SlotContainer) // 要删除的图元是插槽容器
{
SlotContainer slotContainer = graphElement as SlotContainer;
ReBindEventNode(list, slotContainer, null, false); // 重新设定事件结点及图元是否可用
foreach (SlotGraphElement slot in slotContainer.GetSlotList())
{
if (slot.Binded) // 解除绑定连接线控制点
{
if (slot.IsOutSlot && slotContainer is ConditionGraphElement) // 对条件结点连出的线要进行有效性检查
{
ConnectorContainer line = slot.BindingConnector.Line;
if (line.Text == "×")
{
line.Invalid = false;
line.ShowText = false;
}
}
slot.UnBind();
}
}
graphManager.SlotContainerList.Remove(slotContainer); // 从插槽容器索引链表中删除
deleteSuccess = true;
}
else if (graphElement is ConnectorContainer) // 要删除的图元是连接线控制点容器
{
ConnectorContainer connectorContainer = graphElement as ConnectorContainer;
SlotContainer inSlotContainer = connectorContainer.InSlotContainer;
if (inSlotContainer != null)
{
connectorContainer.UnbindInSlotContainer();
}
ReBindEventNode(list, connectorContainer, null, false); // 重新设定事件结点及图元是否可用
SlotContainer outSlotContainer = connectorContainer.OutSlotContainer;
if (outSlotContainer != null)
{
connectorContainer.UnbindOutSlotContainer();
}
if (inSlotContainer is ConditionGraphElement) // 对条件结点连出的线要进行有效性检查
{
dataManager.CheckLineValid(inSlotContainer);
}
graphManager.ConnectorContainerList.Remove(connectorContainer); // 从连接线控制点索引容器中删除
deleteSuccess = true;
}
else if (graphElement is ConnectorGraphElement) // 要删除的图元是连接线控制点
{
ConnectorGraphElement connector = graphElement as ConnectorGraphElement;
if (connector.IsHeadPoint || connector.IsTailPoint) // 不允许删除头结点和尾结点
{
MessageBox.Show("不能删除头连接线控制点和尾连接线控制点！", "图元删除", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
else
{
connector.Line.RemoveConnector(connector);
deleteSuccess = true;
}
}
else if (graphElement is SlotGraphElement) // 要删除的图元是插槽
{
SlotGraphElement slot = graphElement as SlotGraphElement;
if (slot.CanDelete && (slot.IsInSlot || slot.SlotContainer.OutSlotCount > 1)) // 插槽可以删除
{
SlotContainer slotContainer = slot.SlotContainer;
slotContainer.RemoveSlot(slot);
deleteSuccess = true;
}
else
{
MessageBox.Show("该插槽不能删除", "图元删除", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
else if (graphElement is RemarkGraphElement) // 要删除的图元是注释结点
{
RemarkGraphElement remarkGraphElement = graphElement as RemarkGraphElement;
SlotContainer slotContainer = remarkGraphElement.Owner as SlotContainer;
slotContainer.RemarkNode = null;
remarkGraphElement.Owner = null;
remarkGraphElement = null;
deleteSuccess = true;
}
if (deleteSuccess) // 释放图元所占的资源
{
dataManager.DeleteData(graphElement);
graphElement.Release();
}
return(deleteSuccess);
}
