DevExpress之TreeList用法

在程序开发过程中，TreeList控件的使用频率还是挺高的！本文对一些常用算法进行了一些总结：

1.TreeList数据绑定

    TreeList数据绑定采用数据源方式的绑定 

      TreeList.DataSource=List集合,DataTable，DataSet

 绑定之前设置2个基本的绑定属性：KeyFieldName和ParentFieldName

    DataSource为对应 的DataTable,指定KeyFieldName为表主键字段，ParentFieldName为表指向主键的外键字段名。

2.TreeList节点

//鼠标单击节点时，获取节点信息
TreeListHitInfo hitinfo = emTreeList.CalcHitInfo(emTreeList.PointToClient(new Point(e.X, e.Y)));
TreeListNode node = hitinfo.Node;//当前点击的节点

 

//获取emTreeList控件中第一个节点中name的值

emTreeList.Nodes[0].GetValue("name")

 

//点击节点前触发的时间

privatevoid treeLstModuleAction_BeforeCheckNode(object sender, DevExpress.XtraTreeList.CheckNodeEventArgs e)
{
e.State = (e.PrevState == CheckState.Checked ? CheckState.Unchecked : CheckState.Checked);
}

 

//点击节点后触发的时间

privatevoid treeLstModuleAction_AfterCheckNode(object sender, DevExpress.XtraTreeList.NodeEventArgs e)
{
SetCheckedChildNodes(e.Node, e.Node.CheckState);
SetCheckedParentNodes(e.Node, e.Node.CheckState);
}

 

/// 选择子节点时触发
privatevoid SetCheckedChildNodes(TreeListNode node, CheckState check)
{
for (int i =0; i < node.Nodes.Count; i++)
{
node.Nodes[i].CheckState = check;
SetCheckedChildNodes(node.Nodes[i], check);
}
}

 

/// 选择父节点时触发
privatevoid SetCheckedParentNodes(TreeListNode node, CheckState check)
{
  if (node.ParentNode !=null)
 {
    bool b =false;
    CheckState state;
    for (int i =0; i < node.ParentNode.Nodes.Count; i++)
   {
       state = (CheckState)node.ParentNode.Nodes[i].CheckState;
       if (!check.Equals(state))
       {
              b =!b;
              break;
       }
   }
   node.ParentNode.CheckState = b ? CheckState.Indeterminate : check;
   SetCheckedParentNodes(node.ParentNode, check);
 }
}

/// 判断此节点下的所有孩子节点是否选中
private Boolean IsChildsChecked(TreeListNode node)
{
  for (int i =0; i < node.Nodes.Count; i++)
   {
     if (node.Nodes[i].CheckState == CheckState.Unchecked)
          return     false;
       if (node.Nodes[i].HasChildren)
        IsChildsChecked(node.Nodes[i]);
     }
          return  true;
}

 

////折叠当前节点及其所有子节点

 treeListPlate.CollapseAll();

//获取焦点的节点

  TreeListNode node = treeListPlate.FocusedNode;

 

/// 选中后高亮显示
private void treeListPlate_CustomDrawNodeCell(object sender, CustomDrawNodeCellEventArgs e)
{
        TreeList node = sender as TreeList;
         if (e.Node == node.FocusedNode)
        {
           e.Graphics.FillRectangle(SystemBrushes.Window, e.Bounds);
           Rectangle r = new Rectangle(e.EditViewInfo.ContentRect.Left,
           e.EditViewInfo.ContentRect.Top,
           Convert.ToInt32(e.Graphics.MeasureString(e.CellText, treeListPlate.Font).Width + 1),
           Convert.ToInt32(e.Graphics.MeasureString(e.CellText, treeListPlate.Font).Height));

           e.Graphics.FillRectangle(SystemBrushes.Highlight, r);
           e.Graphics.DrawString(e.CellText, treeListPlate.Font, SystemBrushes.HighlightText, r);

           e.Handled = true;
        }
}

 关于TreeList中节点的拖拽实现

要实现TreeList控件中节点的拖拽首先将控件中的AllowDrop属性设置为True;

并实现 DragEnter(在用鼠标将某项拖动到该控件的工作区域是发生) 与  DragDrop(拖放操作完成时发生)这2个拖拽事件；

       /// <summary>
        /// 拖拽的节点
        /// </summary>
        private TreeListNode dragNode;
        /// <summary>
        /// 原始父节点
        /// </summary>
        private TreeListNode orgParentNode;
        /// <summary>
        /// 当前父节点
        /// </summary>
        private TreeListNode pNode = null;
        private int index;
 /// <summary>
        /// 拖拽完成时发生
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void emTreeList_DragDrop(object sender, DragEventArgs e)
        {
            //鼠标单击节点时，获取节点信息
            TreeListHitInfo hitinfo = emTreeList.CalcHitInfo(emTreeList.PointToClient(new Point(e.X, e.Y)));
            TreeListNode node = hitinfo.Node;//当前点击的节点
            Console.WriteLine(node.GetValue("PUBLISHNAME"));
            Console.WriteLine("=="+index.ToString());
            
            try
            {
                if (null != node && null != dragNode)
                {
                    if (index == 0) //当前节点的子节点拖拽
                    {
                        pNode = node;
                    }
                    else //同级别
                    {
                        pNode = node.ParentNode;
                    }
                   
                    //此处根据需求自己写逻辑
      

                    emTreeList.LockReloadNodes();
                }
            }
            catch (Exception)
            {
             MessageBox.Show("当前节点不被允许移动到当前位置！", "警告", MessageBoxButtons.OK, MessageBoxIcon.Warning);
            }
        }


        private void emTreeList_DragEnter(object sender, DragEventArgs e)
        {
          
            dragNode = emTreeList.FocusedNode;
            orgParentNode = dragNode.ParentNode;
        }

        private void emTreeList_CalcNodeDragImageIndex(object sender, DevExpress.XtraTreeList.CalcNodeDragImageIndexEventArgs e)
        {
            index = e.ImageIndex;
    
        }