unit TestMain;

{ Test application for TKPComm and TKPAnsi components.                     }
{ Form and all controls are created in code (no DFM required).             }
{                                                                           }
{ Layout: toolbar row at top (port, settings, open/close, status),         }
{ TKPAnsi terminal filling the rest of the form.  Received serial data     }
{ is polled from TKPComm.Input in a PeekMessage main loop; keystrokes      }
{ from the terminal are sent to the serial port via TKPComm.Output.        }

interface

uses
  SysUtils, Classes, WinTypes, WinProcs, Messages,
  Forms, Controls, StdCtrls, KPComm, KPAnsi;

type
  TMainForm = class(TForm)
  private
    FComm:          TKPComm;    { Serial communications component }
    FAnsi:          TKPAnsi;    { ANSI terminal display }
    FLabelPort:     TLabel;     { "Port:" caption }
    FEditPort:      TEdit;      { COM port number entry }
    FLabelSettings: TLabel;     { "Settings:" caption }
    FEditSettings:  TEdit;      { Baud/parity/data/stop entry }
    FBtnOpen:       TButton;    { Opens the serial port }
    FBtnClose:      TButton;    { Closes the serial port }
    FLabelStatus:   TLabel;     { Displays "Open" or "Closed" }
    FDone:          Boolean;    { True when WM_QUIT received }
    procedure AnsiKeyData(Sender: TObject; const Data: string);
    procedure BtnCloseClick(Sender: TObject);
    procedure BtnOpenClick(Sender: TObject);
    procedure UpdateStatus;
  public
    constructor Create(AOwner: TComponent); override;
    procedure Run;
  end;

var
  MainForm: TMainForm;

implementation


{ OnKeyData handler: sends terminal keystrokes to the serial port }
procedure TMainForm.AnsiKeyData(Sender: TObject; const Data: string);
begin
  if FComm.PortOpen and (Length(Data) > 0) then
  begin
    try
      FComm.Output := Data;
    except
      on E: Exception do
        { Ignore send errors from keyboard input }
    end;
  end;
end;


procedure TMainForm.BtnCloseClick(Sender: TObject);
begin
  FComm.PortOpen := False;
  UpdateStatus;
end;


{ Reads port number and settings from the toolbar, opens the port }
procedure TMainForm.BtnOpenClick(Sender: TObject);
begin
  try
    FComm.CommPort := StrToInt(FEditPort.Text);
    FComm.Settings := FEditSettings.Text;
    FComm.PortOpen := True;
  except
    on E: Exception do
      FAnsi.Write('Open failed: ' + E.Message + #13#10);
  end;
  UpdateStatus;
  FAnsi.SetFocus;
end;


constructor TMainForm.Create(AOwner: TComponent);
begin
  inherited CreateNew(AOwner);

  Caption     := 'KPComm ANSI Terminal';
  BorderStyle := bsSingle;

  FComm := TKPComm.Create(Self);

  { Toolbar row }
  FLabelPort := TLabel.Create(Self);
  FLabelPort.Parent  := Self;
  FLabelPort.Left    := 8;
  FLabelPort.Top     := 12;
  FLabelPort.Caption := 'Port:';

  FEditPort := TEdit.Create(Self);
  FEditPort.Parent := Self;
  FEditPort.Left   := 44;
  FEditPort.Top    := 8;
  FEditPort.Width  := 32;
  FEditPort.Text   := '1';

  FLabelSettings := TLabel.Create(Self);
  FLabelSettings.Parent  := Self;
  FLabelSettings.Left    := 88;
  FLabelSettings.Top     := 12;
  FLabelSettings.Caption := 'Settings:';

  FEditSettings := TEdit.Create(Self);
  FEditSettings.Parent := Self;
  FEditSettings.Left   := 148;
  FEditSettings.Top    := 8;
  FEditSettings.Width  := 140;
  FEditSettings.Text   := '115200,N,8,1';

  FBtnOpen := TButton.Create(Self);
  FBtnOpen.Parent  := Self;
  FBtnOpen.Left    := 300;
  FBtnOpen.Top     := 8;
  FBtnOpen.Width   := 65;
  FBtnOpen.Height  := 25;
  FBtnOpen.Caption := 'Open';
  FBtnOpen.OnClick := BtnOpenClick;

  FBtnClose := TButton.Create(Self);
  FBtnClose.Parent  := Self;
  FBtnClose.Left    := 372;
  FBtnClose.Top     := 8;
  FBtnClose.Width   := 65;
  FBtnClose.Height  := 25;
  FBtnClose.Caption := 'Close';
  FBtnClose.Enabled := False;
  FBtnClose.OnClick := BtnCloseClick;

  FLabelStatus := TLabel.Create(Self);
  FLabelStatus.Parent  := Self;
  FLabelStatus.Left    := 450;
  FLabelStatus.Top     := 12;
  FLabelStatus.Caption := 'Closed';

  { ANSI terminal -- FontSize controls the OEM terminal font point size. }
  { The control auto-sizes Width/Height from FontSize, Cols, and Rows.   }
  FAnsi := TKPAnsi.Create(Self);
  FAnsi.FontSize := 12;
  FAnsi.Parent    := Self;
  FAnsi.Left      := 0;
  FAnsi.Top       := 38;
  FAnsi.OnKeyData := AnsiKeyData;
end;


{ PeekMessage polling loop.  Drains Windows messages, polls serial        }
{ data from TKPComm, and yields CPU when idle.                            }
procedure TMainForm.Run;
const
  BufSize = 2048;
var
  Msg:     TMsg;
  Buf:     array[0..BufSize - 1] of Char;
  Len:     Integer;
  HasData: Boolean;
begin
  Show;

  { Size form to fit terminal + toolbar.  Show triggers handle creation  }
  { and RecalcCellSize, so FAnsi.Width/Height reflect measured font.     }
  ClientWidth  := FAnsi.Width;
  ClientHeight := FAnsi.Top + FAnsi.Height;

  FDone := False;
  while not FDone do
  begin
    while PeekMessage(Msg, 0, 0, 0, pm_Remove or pm_NoYield) do
    begin
      if Msg.message = wm_Quit then
      begin
        FDone := True;
        Break;
      end;
      TranslateMessage(Msg);
      DispatchMessage(Msg);
    end;

    if FDone then
      Break;

    { Read serial data into the terminal }
    HasData := False;
    if FComm.PortOpen then
    begin
      Len := FComm.ReadInputBuf(@Buf, BufSize);
      while (Len > 0) and not FDone do
      begin
        FAnsi.WriteDeferredBuf(@Buf, Len);
        HasData := True;
        while PeekMessage(Msg, 0, 0, 0, pm_Remove or pm_NoYield) do
        begin
          if Msg.message = wm_Quit then
          begin
            FDone := True;
            Break;
          end;
          TranslateMessage(Msg);
          DispatchMessage(Msg);
        end;
        Len := FComm.ReadInputBuf(@Buf, BufSize);
      end;
    end;

    if FDone then
      Break;

    { Update cursor blink and repaint any dirty rows }
    FAnsi.TickBlink;
    FAnsi.FlipToScreen;

    { Yield CPU when no serial data is flowing }
    if not HasData then
      Yield;
  end;
end;


{ Syncs button enabled state and status label with port open/closed }
procedure TMainForm.UpdateStatus;
begin
  if FComm.PortOpen then
    FLabelStatus.Caption := 'Open'
  else
    FLabelStatus.Caption := 'Closed';

  FBtnOpen.Enabled  := not FComm.PortOpen;
  FBtnClose.Enabled := FComm.PortOpen;
end;


end.