private void tvModelDatasources_DragDrop(object sender, DragEventArgs e)
{
TreeNode treeNode = null;
IBaseNode baseNode = null;
IDataDefinitionExport export = null;
eDropMode dropMode = DropStrategy(e, ref treeNode, ref baseNode, ref export);
if (treeNode != null)
{
tvModelDatasources.SelectedNode = treeNode;
switch (dropMode)
{
case eDropMode.DropBaseNode:
TreeNode newBaseNode = TreeNodeFromBaseNode(baseNode);
Root.Nodes.Add(newBaseNode);
tvModelDatasources.SelectedNode = newBaseNode;
break;
case eDropMode.DropExportMethod:
case eDropMode.DropExportVariable:
TreeNode newExport = TreeNodeFromDataDefinitionExport(export);
tvModelDatasources.SelectedNode.Nodes.Add(newExport);
tvModelDatasources.SelectedNode = newExport;
break;
}
}
}
protected eDropMode DropStrategy(DragEventArgs e, ref TreeNode treeNode, ref IBaseNode baseNode, ref IDataDefinitionExport export)
{
Point targetPoint = tvModelDatasources.PointToClient(new Point(e.X, e.Y));
treeNode = tvModelDatasources.GetNodeAt(targetPoint);
if (treeNode != null)
{
baseNode = getIBaseNode(e);
if (baseNode != null)
{
if (TreeNodeContains(Root, baseNode))
{
return(eDropMode.Undefined);
}
return(eDropMode.DropBaseNode);
}
export = getIDataDefinitionExport(e);
eDropMode result = eDropMode.Undefined;
if (export != null)
{
if (isDomainObject(treeNode) && export.ExportType == eExportType.Method)
{
result = eDropMode.DropExportMethod;
}
if (isVariableDef(treeNode) && export.ExportType == eExportType.Variable)
{
result = eDropMode.DropExportVariable;
}
}
TreeNode tn = treeNode.Tag is IDataDefinitionExport
? treeNode.Parent
: treeNode;
if (TreeNodeContains(tn, export))
{
result = eDropMode.Undefined;
}
return(result);
}
return(eDropMode.Undefined);
}
private void tvModelDatasources_DragOver(object sender, DragEventArgs e)
{
TreeNode treeNode = null;
IBaseNode baseNode = null;
IDataDefinitionExport export = null;
eDropMode dropMode = DropStrategy(e, ref treeNode, ref baseNode, ref export);
e.Effect = DragDropEffects.None;
if (treeNode != null)
{
tvModelDatasources.SelectedNode = treeNode;
switch (dropMode)
{
case eDropMode.DropBaseNode:
case eDropMode.DropExportMethod:
case eDropMode.DropExportVariable:
e.Effect = DragDropEffects.Copy;
break;
}
}
}