private void BuildTree()
{
this.SuspendLayout();
this.Nodes.Clear();
if (EventSupport == null)
{
return;
}
foreach (EventTimeAbstract eventTime in EventSupport.EventTimeProvide)
{
EventTimeTreeNode timeNode = new EventTimeTreeNode(eventTime);
//加载该触发时机下的事件
foreach (EventBase eventBase in EventSupport.Events.GetEventsByTime(eventTime.Code))
{
timeNode.Nodes.Add(new EventTreeNode(eventBase));
}
this.Nodes.Add(timeNode);
}
this.ExpandAll();
this.ResumeLayout();
}
protected override void ProcessDragDrop(TreeNode dragNode, TreeNode dropNode)
{
CollectionEditEventArgs[] eventArgs = new CollectionEditEventArgs[2];
EventTreeNode node = dragNode as EventTreeNode;
int nodeOldIndex = this.EventSupport.Events.IndexOf(node.Event);
EventBase oldEvent = null;
if (EventOrderChanged != null)
{
oldEvent = node.Event.Clone() as EventBase;
}
#region 如果目标节点是触发时机
//如果目标节点是触发时机，把拖动的节点放到这个触发时机的最后面
//需要调用一次EventCollection.Down方法，同步事件序列的顺序
//并把拖动的事件的触发时机修改为目标节点同样的触发时机
if (dropNode.GetType().Equals(typeof(EventTimeTreeNode)))
{
//直接调用基类方法完成节点移动
base.MoveNode(dragNode, dropNode);
//同步触发事件顺序
//拿到dragNode的前一个节点（如果有），调用一次Down方法
//改变触发时机
EventTimeTreeNode eventTimeNode = dragNode.Parent as EventTimeTreeNode;
node.Event.EventTime = eventTimeNode.EventTime.Code;
//确保拖动的事件在事件序列中处于当前触发时机中所有事件的最后
EventTreeNode eventNode = dragNode.PrevNode as EventTreeNode;
if (eventNode != null)
{
this.EventSupport.Events.NextTo(node.Event, eventNode.Event);
}
}
#endregion
#region 如果目标节点是事件
//如果目标节点是事件，把拖动的事件放到这个事件的前面，需调用Up方法同步事件顺序
//并把拖动的事件的触发时机修改为目标节点同样的触发时机
else if (dropNode.GetType().Equals(typeof(EventTreeNode)))
{
//如果放在拖动节点的同级下一个节点，do nothing
if (dropNode.NextNode == dragNode)
{
return;
}
//移动树节点
// Remove drag node from parent
dragNode.Parent.Nodes.Remove(dragNode);
// Add drag node to drop node
dropNode.Parent.Nodes.Insert(dropNode.Index + 1, dragNode);
EventTreeNode prevNode = dragNode.PrevNode as EventTreeNode;
//改变触发时机
node.Event.EventTime = prevNode.Event.EventTime;
//nextNode不可能为null，就是dragNode
this.EventSupport.Events.NextTo(node.Event, prevNode.Event);
}
#endregion
if (EventOrderChanged != null)
{
CollectionEditEventArgs args0 = new CollectionEditEventArgs(this.EventSupport.Events,
CollectionEditType.Edit, this.EventSupport.Events.IndexOf(node.Event), node.Event);
args0.Members.Inject(ObjectCompare.Compare(oldEvent, node.Event));
eventArgs[0] = args0;
eventArgs[1] = new CollectionEditEventArgs(this.EventSupport.Events, CollectionEditType.Move,
this.EventSupport.Events.IndexOf(node.Event), nodeOldIndex, node.Event);
EventOrderChanged(eventArgs);
}
}