/// <summary>
/// Raises the GetNextDataBlock event
/// </summary>
/// <param name="args"></param>
private void OnGetNextDataBlock(GetNextNodeDataBlockEventArgs args)
{
if (!mRaiseEventsFlag)
{
return;
}
EventHandler<GetNextNodeDataBlockEventArgs> handler = GetNextDataBlock;
if (handler != null)
{
handler(this, args);
}
}
/// <summary>
/// Process the GetNextDataBlock event from the Tree. Finds the corresponding next data block
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected virtual void ProcessTreeGetNextDataBlock(object sender, GetNextNodeDataBlockEventArgs e)
{
List<KeyValuePair<string, Oid>> lOidPathList = new List<KeyValuePair<string, Oid>>(e.CompleteOidPath);
IUQueryContext queryContext = null;
if (IsRootNode(lOidPathList))
{
TreeNodeController lNodeController = GetNodeById(lOidPathList[0].Key);
if (lNodeController == null)
{
return;
}
queryContext = lNodeController.QueryContext;
}
else
{
lOidPathList.Reverse();
queryContext = UpdateAllNodeContextInformation(lOidPathList);
}
if (queryContext == null)
{
return;
}
// Get the DisplaySetInformation from the node controller.
TreeNodeController treeNodeController = this.GetNodeById(e.NodeId);
DisplaySetInformation lDisplaySetInfo = treeNodeController.DisplaySetInfo;
DataTable lData = null;
lData = GetNextDataBlock(queryContext, e.LastOid);
// Send the DisplaySetInformation in the event arguments.
e.DisplaySetInfo = lDisplaySetInfo;
e.Data = lData;
e.LastBlock = IsLastBlock(queryContext);
}
/// <summary>
/// Executes the selected node processing.
/// </summary>
/// <param name="treeNode">TreeView node.</param>
private void ProcessNodeSelected(TreeNode treeNode)
{
InstanceNodeInfo lInstanceInfo = null;
List<KeyValuePair<string, Oid>> lCompleteOidPath = GetCompleteOidPath(treeNode);
// Next block of instances
if (treeNode.Text.Equals("..."))
{
// Get the last Oid
Oid lLastOid = null;
if (treeNode.PrevNode != null && treeNode.PrevNode.Tag != null)
{
lInstanceInfo = treeNode.PrevNode.Tag as InstanceNodeInfo;
if (lInstanceInfo != null)
{
lLastOid = lInstanceInfo.InstanceOid;
}
}
GetNextNodeDataBlockEventArgs getNextBlockArgs = new GetNextNodeDataBlockEventArgs(treeNode.Name, lLastOid, lCompleteOidPath);
OnGetNextDataBlock(getNextBlockArgs);
TreeNode parentNode = treeNode.Parent;
// Delete the special node
mRaiseEventsFlag = false;
mTreeViewIT.Nodes.Remove(treeNode);
mRaiseEventsFlag = true;
// Add the received data to the parent node
AddDataToNode(parentNode,treeNode.Name, getNextBlockArgs.Data, getNextBlockArgs.DisplaySetInfo, getNextBlockArgs.LastBlock, false);
return;
}
// Instance or intermadia node ?
// Raise the proper selected event
if (treeNode.Tag != null && (treeNode.Tag as InstanceNodeInfo) != null)
{
ProcessInstanceNodeSelected(treeNode);
}
else
{
ProcessNoInstanceNodeSelected(treeNode);
}
mTreeViewIT.Focus();
}
/// <summary>
/// Executes actions related to getting next DataBlock.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void HandleTreeGetNextDataBlock(object sender, GetNextNodeDataBlockEventArgs e)
{
ProcessTreeGetNextDataBlock(sender, e);
}
