/// <summary> 拖拽开始执行的事件
/// 做为数据发送者时触发 </summary>
/// <param name="context"></param>
protected override void OnDragBegin(DragContext context)
{
DragDropJudedArgs args = new DragDropJudedArgs()
{
DragContext = context
};
OnDragBeginJudgedHandle(args);
if (!args.Handle)
{
var selectviewdatas = new List <T>();
var selecttreeiters = this.GetAllSelectedTreeIters();
foreach (var item in selecttreeiters)
{
var isselectparent = selecttreeiters.FirstOrDefault(i => this.IsParent(item, i));
if (isselectparent.Equals(TreeIter.Zero))
{
selectviewdatas.Add(this.GetJisonsTreeIter(item).Data);
}
}
var dragData = new DragData()
{
SelectionDatas = selectviewdatas,
IsDo = false
};
context.SetDragData(dragData);
//Gtk.Drag.SetIconPixbuf(context, dragPixbuf, 0, 0);
base.OnDragBegin(context);
}
}
protected void OnOnDragDropJudgedHandle(DragDropJudedArgs args)
{
if (this.OnDragDropJudged != null)
{
this.OnDragDropJudged(this, args);
}
}
protected void TreeView_OnDragDropJudged(object sender, DragDropJudedArgs e)
{
if (this.OnDragDropJudged != null)
{
this.OnDragDropJudged(sender, e);
}
}
void TreeView_OnDragMotionJudged(object sender, DragDropJudedArgs e)
{
if (this.OnDragMotionJudged != null)
{
this.OnDragMotionJudged(this, e);
}
}
protected override bool OnDragDrop(DragContext context, int x, int y, uint time_)
{
DragDropJudedArgs args = new DragDropJudedArgs()
{
DragContext = context
};
OnOnDragDropJudgedHandle(args);
if (!args.Handle)
{
return(base.OnDragDrop(context, x, y, time_));
}
else
{
return(false);
}
}
protected override bool OnDragMotion(DragContext context, int x, int y, uint time_)
{
DragDropJudedArgs args = new DragDropJudedArgs()
{
DragContext = context
};
OnOnDragMotionJudgedHandle(args);
if (!args.Handle)
{
var dragwidget = context.GetSourceWidget();
if (dragwidget != null)
{
var dragData = context.GetDragData() as DragData;
//内部拖拽
if (dragData != null)
{
return(base.OnDragMotion(context, x, y, time_));
}
else
{
return(false);
}
}
else
{
//此时拖拽为外部拖拽
return(true);
}
}
else
{
if (args.AllDrop)
{
return(base.OnDragMotion(context, x, y, time_));
}
else
{
return(false);
}
}
}
/// <summary> 接收具有拖拽数据的事件
/// 做为数据接收者时触发 </summary>
/// <param name="context"></param>
/// <param name="x"></param>
/// <param name="y"></param>
/// <param name="selection_data"></param>
/// <param name="info"></param>
/// <param name="time_"></param>
protected override void OnDragDataReceived(DragContext context, int x, int y, SelectionData selection_data, uint info, uint time_)
{
DragDropJudedArgs args = new DragDropJudedArgs()
{
DragContext = context
};
OnOnDragDataReceivedJudgedHandle(args);
if (!args.Handle)
{
base.OnDragDataReceived(context, x, y, selection_data, info, time_);
var dragData = context.GetDragData() as DragData;
//内部拖拽
if (dragData != null)
{
Gtk.TreePath treePath; Gtk.TreeViewDropPosition dropPostition;
var isDrop = GetDropTargetRow(x, y, out treePath, out dropPostition);
#region 结构树内数据项之间拖拽
if (isDrop)
{
dragData.IsDo = true;
var iters = dragData.SelectionDatas as List <T>;
var treeiterparent = this.GetTreeIter(treePath);
if (iters != null)
{
var parentjti = this.GetJisonsTreeIter(treeiterparent);
if (!iters.Contains(parentjti.Data))
{
switch (dropPostition)
{
case TreeViewDropPosition.Before:
{
if (iters.All(i => this.RootTreeIter.CanDrop(parentjti.Data, i as object, DropPosition.InsertBefore, false)))
{
this.RootTreeIter.Drop(parentjti.Data, iters.Cast <object>().ToList(), DropPosition.InsertBefore, false);
}
break;
}
case TreeViewDropPosition.After:
{
if (iters.All(i => this.RootTreeIter.CanDrop(parentjti.Data, i as object, DropPosition.InsertAfter, false)))
{
this.RootTreeIter.Drop(parentjti.Data, iters.Cast <object>().ToList(), DropPosition.InsertAfter, false);
}
break;
}
default:
{
if (!iters.Contains(parentjti.Data) && iters.All(i => this.RootTreeIter.CanDrop(parentjti.Data, i as object, DropPosition.Add, false)))
{
this.RootTreeIter.Drop(parentjti.Data, iters.Cast <object>().ToList(), DropPosition.Add, false);
}
break;
}
}
}
}
}
#endregion
#region 数据拖动到结构树数据项之外时触发
else if (treePath == null)
{
dragData.IsDo = true;
var iters = dragData.SelectionDatas as List <T>;
if (iters != null)
{
foreach (var item in iters)
{
var jti = this.GetJisonsTreeIter(item);
if (this.JisonsTreeIters.Contains(jti) &&
this.GetParentTreeIter(jti.TreeIter).Equals(TreeIter.Zero))
{
continue;
}
if (item != null)
{
if (this.RootTreeIter != null && this.RootTreeIter.FirstDepthChildren.FirstOrDefault() != null)
{
this.RootTreeIter.Drop(this.RootTreeIter.FirstDepthChildren.FirstOrDefault(), iters.Cast <object>().ToList(), DropPosition.Add, false);
}
}
}
}
}
#endregion
}
}
}
