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DnDHighlightHelper.cs
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DnDHighlightHelper.cs
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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using DevExpress.XtraTreeList;
using DevExpress.XtraTreeList.Nodes;
using DevExpress.Utils;
namespace WindowsApplication1
{
public class DnDHighlightHelper:Component
{
private AppearanceObject _AppearanceHighlight = new AppearanceObject();
[DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
public AppearanceObject AppearanceHighlight
{
get { return _AppearanceHighlight ?? AppearanceObject.EmptyAppearance; }
set { _AppearanceHighlight = value; }
}
private TreeList _SelectedTreeList;
public TreeList SelectedTreeList
{
get { return _SelectedTreeList; }
set { UnsubsribeEvents(); _SelectedTreeList = value; SubsribeEvents(); }
}
private void SubsribeEvents()
{
if (SelectedTreeList == null) return;
SelectedTreeList.NodeCellStyle += TreeList_NodeCellStyle;
SelectedTreeList.DragOver += TreeList_DragOver;
SelectedTreeList.AfterDragNode += TreeList_AfterDragNode;
}
private void UnsubsribeEvents()
{
if (SelectedTreeList == null) return;
SelectedTreeList.NodeCellStyle -= TreeList_NodeCellStyle;
SelectedTreeList.DragOver -= TreeList_DragOver;
SelectedTreeList.AfterDragNode -= TreeList_AfterDragNode;
}
private TreeListNode hotTrackNode;
private TreeListNode HotTrackNode
{
get
{
return hotTrackNode;
}
set
{
if (hotTrackNode != value)
{
TreeListNode prevNode = hotTrackNode;
hotTrackNode = value;
SelectedTreeList.RefreshNode(prevNode);
SelectedTreeList.RefreshNode(HotTrackNode);
}
}
}
private void TreeList_NodeCellStyle(object sender, GetCustomNodeCellStyleEventArgs e)
{
if (e.Node == HotTrackNode)
e.Appearance.Assign(AppearanceHighlight);
}
private void TreeList_DragOver(object sender, DragEventArgs e)
{
TreeList treeList = sender as TreeList;
Point p = treeList.PointToClient(new Point(e.X, e.Y));
TreeListHitInfo hitInfo = SelectedTreeList.CalcHitInfo(p);
if (hitInfo.Node == null)
{
p.X = 2;
hitInfo = SelectedTreeList.CalcHitInfo(p);
}
HotTrackNode = hitInfo.Node;
}
private void TreeList_AfterDragNode(object sender, NodeEventArgs e)
{
HotTrackNode = null;
}
}
}