public static CanvasPositionCursor PrevInputItem(
this CanvasPositionCursor Cursor, ScreenVisualItems VisualItems,
VisualFeature?Feature = null, bool Reuse = true)
{
VisualItemCursor vc = null;
var cursor = Cursor;
if (cursor.IsOutsideVisualItem() == true)
{
vc = VisualItems.FindPrevInputItem(cursor.RowCol, Feature);
}
else
{
vc = Cursor.ItemCursor.PrevInputItem(Feature);
}
if (vc == null)
{
cursor = null;
}
else if (Reuse == true)
{
cursor.ItemCursor = vc;
cursor.Position = 1;
}
else
{
cursor = new CanvasPositionCursor(vc, 1);
}
return(cursor);
}
public LinkedListNode <IVisualItem> InsertIntoVisualItemsList(
ScreenVisualItems VisualItems)
{
// insert this spanner object.
var node = VisualItems.InsertIntoVisualItemsList(this);
return(node);
}
public static CanvasPositionCursor PrevInputItemCircular(
this CanvasPositionCursor Cursor, ScreenVisualItems VisualItems,
VisualFeature?Feature = null, bool Reuse = true)
{
var posCursor = Cursor.PrevInputItem(VisualItems, Feature, Reuse);
if (posCursor == null)
{
var ic = VisualItems.InputItemList().Last();
if (ic != null)
{
posCursor = new CanvasPositionCursor(ic);
}
}
return(posCursor);
}
/// <summary>
/// no longer used. called WorkstationCommandListExt.ProcessAndPaint, which
/// itself is not used.
/// </summary>
/// <param name="VisualItems"></param>
/// <param name="Caret"></param>
/// <returns></returns>
public static byte[] BuildSaveScreenResponse(
ScreenVisualItems VisualItems, CanvasPositionCursor Caret)
{
var ra = new ByteArrayBuilder();
// data stream header.
{
var buf = DataStreamHeader.Build(50, TerminalOpcode.SaveScreen, 0, 0);
ra.Append(buf);
}
// restore screen workstation command.
{
var cmd = new RestoreScreenCommand();
ra.Append(cmd.ToBytes());
}
// clear unit command.
{
var cmd = new ClearUnitCommand();
ra.Append(cmd.ToBytes());
}
// WTD command.
{
var ordersByteStream = VisualItems.BuildOrderStream(Caret);
var buf = WriteToDisplayCommand.Build(0x00, 0x18, ordersByteStream);
ra.Append(buf);
}
// update length of response data stream.
{
var wk = new ByteArrayBuilder();
wk.AppendBigEndianShort((short)ra.Length);
ra.CopyToBuffer(wk.ToByteArray(), 0);
}
// IAC EOR
{
ra.Append(EOR_Command.Build());
}
return(ra.ToByteArray());
}
public CanvasPositionCursor(ScreenVisualItems VisualItems, ZeroRowCol RowCol)
{
var itemCursor = VisualItems.FindVisualItem(RowCol);
if (itemCursor == null)
{
this.ItemCursor = null;
this.Position = 0;
this.OutsideRowCol = RowCol;
}
else
{
var item = itemCursor.GetVisualItem();
var iItem = item as IVisualItem;
int pos = RowCol.ColNum - iItem.ShowRowCol().ColNum + 1;
this.ItemCursor = itemCursor;
this.Position = pos;
}
}
/// <summary>
/// advance the cursor one column to the right. The advanced to location depends
/// if the cursor is located in an input field, if the cursor is at the last
/// column of the input field and if it is, whether the code should advance to the
/// next input field or to the screen location to the right which is outside the
/// input field.
/// </summary>
/// <param name="HowAdvance"></param>
/// <param name="Reuse"></param>
/// <returns></returns>
public CanvasPositionCursor AdvanceRight(ScreenVisualItems VisualItems,
HowAdvance HowAdvance = HowAdvance.NextEntryField,
bool Reuse = true)
{
var cursor = this;
if (cursor.IsOutsideVisualItem() == true)
{
var rowCol = cursor.RowCol.AdvanceRight();
cursor = new CanvasPositionCursor(VisualItems, rowCol as ZeroRowCol);
}
else
{
var vi = cursor.GetVisualItem();
var pos = cursor.Position;
// cursor located in entry field. and cursor is at the end of the input field.
if (((vi as VisualItem)?.IsInputItem == true) &&
((vi as VisualItem).IsLastColumn(this.Position)))
{
if (HowAdvance == HowAdvance.NextEntryField)
{
cursor = this.NextInputItemCircular(VisualItems, null, Reuse);
}
}
else
{
if (Reuse == true)
{
cursor.Position += 1;
}
else
{
cursor = new CanvasPositionCursor(this.ItemCursor, this.Position + 1);
}
}
}
return(cursor);
}
public CanvasPositionCursor AdvanceLeft(ScreenVisualItems VisualItems,
HowAdvance HowAdvance = HowAdvance.NextEntryField,
bool Reuse = true)
{
var cursor = this;
if (cursor.IsOutsideVisualItem() == true)
{
var rowCol = cursor.RowCol.AdvanceLeft();
cursor = new CanvasPositionCursor(VisualItems, rowCol as ZeroRowCol);
}
else
{
var vi = cursor.GetVisualItem();
var pos = cursor.Position;
// cursor located in entry field. and cursor is at the end of the input field.
if (((vi as VisualItem)?.IsInputItem == true) && (this.Position == 1) &&
(HowAdvance == HowAdvance.NextEntryField))
{
cursor = this.PrevInputItem(VisualItems, null, Reuse);
// need to set cursor position to the last position in the visual item.
}
else
{
if (Reuse == true)
{
cursor.Position -= 1;
}
else
{
cursor = new CanvasPositionCursor(this.ItemCursor, this.Position - 1);
}
}
}
return(cursor);
}
public static IEnumerable <string> PrintVisualItems(ScreenVisualItems VisualItems)
{
var lines = new List <string>();
{
var titleText = "----------- Canvas Visual Item Listing -----------";
lines.Add(titleText.PadCenter(80));
var chd = wtdReport.PrintColumnHeading();
lines.AddRange(chd);
}
foreach (var cursor in VisualItems.CanvasItemList( ))
{
var iVisual = cursor.GetVisualItem();
var visualItem = iVisual as VisualItem;
var printItem = new PrintItem(iVisual.ItemRowCol.ToOneRowCol() as OneRowCol);
if (visualItem.IsInputItem == false)
{
printItem.ItemType = ReportItemType.Literal;
printItem.ItemText = iVisual.ShowText;
printItem.ItemLgth = iVisual.ShowText.Length;
}
else
{
printItem.ItemType = ReportItemType.Field;
printItem.ItemText = iVisual.ShowText;
printItem.ItemLgth = iVisual.ShowText.Length;
}
if (printItem.ItemLgth > 0)
{
printItem = wtdReport.PrintAndAdvance(lines, printItem);
}
}
return(lines);
}
public static CanvasPositionCursor NextInputItemNextLine(
this CanvasPositionCursor PosCursor, ScreenVisualItems VisualItems)
{
var posCursor = PosCursor;
// save the row/col of the current
var startRowCol = PosCursor.RowCol;
while (true)
{
posCursor = posCursor.NextInputItemCircular(VisualItems);
if (startRowCol.RowNum != posCursor.RowCol.RowNum)
{
break;
}
if (posCursor.RowCol.CompareTo(startRowCol) != 1)
{
break;
}
}
return(posCursor);
}
public CanvasPositionCursor AdvanceUp(ScreenVisualItems VisualItems)
{
var rowCol = this.RowCol.AdvanceUp();
return(new CanvasPositionCursor(VisualItems, rowCol as ZeroRowCol));
}
ProcessWorkstationDataStream(
this ServerConnectPack ConnectPack, ScreenVisualItems VisualItems,
CanvasPositionCursor Caret)
{
WorkstationCommandList workstationCmdList = null;
List <WriteToDisplayCommand> wtdCmdList = null;
DataStreamHeader dsh = null;
var returnCmdList = new WorkstationCommandList();
HowReadScreen?howRead = null;
var logList = new TelnetLogList();
bool gotEOR = false;
while (gotEOR == false)
{
// input array is eof. Exit loop if have read a READ workstn command.
// Otherwise, read from server.
if (ConnectPack.ReadBlocks.IsEmpty == true)
{
if (howRead != null)
{
break;
}
}
var item = ConnectPack.ReadBlocks.WaitAndDequeue();
if (item is DataStreamHeader)
{
dsh = item as DataStreamHeader;
continue;
}
gotEOR = true;
if (item is WorkstationCommandList)
{
workstationCmdList = item as WorkstationCommandList;
foreach (var workstationCmd in workstationCmdList)
{
if (workstationCmd is ClearUnitCommand)
{
returnCmdList.Add(workstationCmd);
}
// WTD command. Add to list of WTD commands. This list is returned to
// the caller of this method.
else if (workstationCmd is WriteToDisplayCommand)
{
returnCmdList.Add(workstationCmd);
var wtdCommand = workstationCmd as WriteToDisplayCommand;
if (wtdCmdList == null)
{
wtdCmdList = new List <WriteToDisplayCommand>();
}
wtdCmdList.Add(wtdCommand);
}
else if (workstationCmd is ReadMdtFieldsCommand)
{
howRead = HowReadScreen.ReadMdt;
}
// save screen command. Build response, send back to server.
else if (workstationCmd is SaveScreenCommand)
{
var ra =
SaveScreenCommandExt.BuildSaveScreenResponse(VisualItems, Caret);
// send response stream back to server.
{
TelnetConnection.WriteToHost(
logList, ra, ConnectPack.TcpClient.GetStream());
gotEOR = false;
}
}
else if (workstationCmd is WriteStructuredFieldCommand)
{
var wsfCmd = workstationCmd as WriteStructuredFieldCommand;
if (wsfCmd.RequestCode == WSF_RequestCode.Query5250)
{
var ra = Query5250Response.BuildQuery5250Response();
// send response stream back to server.
{
TelnetConnection.WriteToHost(
logList, ra, ConnectPack.TcpClient.GetStream());
gotEOR = false;
}
}
}
}
}
}
return(new Tuple <HowReadScreen?, List <WriteToDisplayCommand>,
TelnetLogList, WorkstationCommandList, DataStreamHeader, bool>(
howRead, wtdCmdList, logList, returnCmdList, dsh, gotEOR));
}
ProcessWorkstationDataStream(
this ConnectedSocketPack SocketPack, ScreenVisualItems VisualItems,
CanvasPositionCursor Caret)
{
WorkstationCommandList workstationCmdList = null;
List <WriteToDisplayCommand> wtdCmdList = null;
DataStreamHeader dsh = null;
var returnCmdList = new WorkstationCommandList();
HowReadScreen?howRead = null;
var logList = new TelnetLogList();
bool gotEOR = false;
while (gotEOR == false)
{
// input array is eof. Exit loop if have read a READ workstn command.
// Otherwise, read from server.
if (SocketPack.InputArray.IsEof() == true)
{
if (howRead != null)
{
break;
}
{
var log = SocketPack.InputArray.ReadFromNetworkStream(10, 60);
logList.AddItems(log);
if (SocketPack.InputArray.IsEof() == true)
{
break;
}
}
}
// peek at the input stream from server. Classify the data that is next
// to receive.
var typeData = ServerDataStream.PeekServerCommand(SocketPack.InputArray);
// input data not recogizied. Not a 5250 data strem header.
if (typeData == null)
{
logList.AddItem(Direction.Read, "Unknown data stream data");
logList.AddItems(
Direction.Read, SocketPack.InputArray.PeekBytes().ToHexReport(16));
break;
}
if (typeData.Value == TypeServerData.workstationHeader)
{
{
var rv = Process5250.GetAndParseWorkstationCommandList(
SocketPack.InputArray, SocketPack.Settings);
dsh = rv.Item1;
workstationCmdList = rv.Item2;
logList.AddItems(rv.Item3);
gotEOR = rv.Item4;
}
foreach (var workstationCmd in workstationCmdList)
{
if (workstationCmd is ClearUnitCommand)
{
returnCmdList.Add(workstationCmd);
}
// WTD command. Add to list of WTD commands. This list is returned to the
// caller of this method.
else if (workstationCmd is WriteToDisplayCommand)
{
returnCmdList.Add(workstationCmd);
var wtdCommand = workstationCmd as WriteToDisplayCommand;
if (wtdCmdList == null)
{
wtdCmdList = new List <WriteToDisplayCommand>();
}
wtdCmdList.Add(wtdCommand);
}
else if (workstationCmd is ReadMdtFieldsCommand)
{
howRead = HowReadScreen.ReadMdt;
}
// save screen command. Build response, send back to server.
else if (workstationCmd is SaveScreenCommand)
{
var ra = SaveScreenCommandExt.BuildSaveScreenResponse(VisualItems, Caret);
// send response stream back to server.
{
TelnetConnection.WriteToHost(logList, ra, SocketPack.TcpStream);
gotEOR = false;
}
}
else if (workstationCmd is WriteStructuredFieldCommand)
{
var wsfCmd = workstationCmd as WriteStructuredFieldCommand;
if (wsfCmd.RequestCode == WSF_RequestCode.Query5250)
{
var ra = Query5250Response.BuildQuery5250Response();
// send response stream back to server.
{
TelnetConnection.WriteToHost(logList, ra, SocketPack.TcpStream);
gotEOR = false;
}
}
}
else if (workstationCmd is WriteSingleStructuredFieldCommand)
{
}
}
}
}
return(new Tuple <HowReadScreen?, List <WriteToDisplayCommand>,
TelnetLogList, WorkstationCommandList, DataStreamHeader, bool>(
howRead, wtdCmdList, logList, returnCmdList, dsh, gotEOR));
}