Dim MinWindowSize As Integer

Sub Form_Load ()

    Height = Screen.Height / 2
    Width = Screen.Width * .75
    Top = Screen.Height * .25
    Left = (Screen.Width - Width) / 2

    Receive_Text.Text = ""
    Transmit_Text.Text = ""

    Initialize

End Sub

Sub Receive_Timer_Timer ()
    
    a$ = ReadCommPort(128)

    If Len(a$) > 0 Then
        Receive_Text.selstart = Len(Receive_Text.Text) + 1
        Receive_Text.sellength = 0
        Receive_Text.seltext = a$
    End If

End Sub

Sub Receive_Text_KeyPress (KeyAscii As Integer)

    KeyAscii = 0

End Sub

Sub Form_Unload (Cancel As Integer)

    If CommDemo.Menu_Windows.Enabled Then
        CommDemo.Menu_Window_Receive_Transmit.Checked = FALSE
        Hide
        Cancel = TRUE
        Exit Sub
    End If

End Sub

Sub Transmit_Text_KeyPress (KeyAscii As Integer)

    If KeyAscii = 13 Then
       If CommDemo.Menu_Comm_Send_CRLF.Checked = TRUE Then
          Work$ = Chr$(13) + Chr$(11)
       Else
          Work$ = Chr$(13)
       End If

       WriteCommPort Transmit_Text.Text + Work$
       Transmit_Text.Text = ""
       KeyAscii = 0
    End If

    ' Remove the BEEP for CTRL characters

    If KeyAscii < 32 Then
       KeyAscii = 0
    End If

End Sub

Sub Initialize ()
    
    ForeColor = &HFFFFFF

    Text$ = "Receive Window"
    FontSize = 10
    
    tHeight = TextHeight(Text$)
    tWidth = TextWidth(Text$)

    CurrentX = (ScaleWidth - tWidth) \ 2
    CurrentY = tHeight * .5
    
    Transmit_Text.Move 0, ScaleHeight - Transmit_Text.Height, ScaleWidth, Transmit_Text.Height
    
    Receive_Text.Top = tHeight * 2
    MinWindowSize = Receive_Text.Top
    Receive_Text.Move 0, Receive_Text.Top, ScaleWidth, ScaleHeight - (Transmit_Text.Height + Receive_Text.Top + tHeight * 2)
    
    Text$ = "Transmit Window"
    FontSize = 10
    
    tHeight = TextHeight(Text$)
    tWidth = TextWidth(Text$)

    CurrentX = (ScaleWidth - tWidth) \ 2
    CurrentY = Transmit_Text.Top - tHeight * 1.5

    ForeColor = &H0

    MinWindowSize = MinWindowSize + (ScaleHeight - CurrentY) * 2

End Sub

Sub Form_Resize ()
    
    Work% = ScaleHeight - MinWindowSize

    If Work% < 0 Then
        Height = Height + Abs(Work%)
    End If

    Initialize

End Sub

Sub PaintText ()
    
    Cls
        
    ForeColor = &H0
    Text$ = "Receive Window"
    FontSize = 10
    
    tHeight = TextHeight(Text$)
    tWidth = TextWidth(Text$)

    CurrentX = (ScaleWidth - tWidth) \ 2
    CurrentY = tHeight * .5
    Print Text$

    Text$ = "Transmit Window"
    FontSize = 10
    
    tHeight = TextHeight(Text$)
    tWidth = TextWidth(Text$)

    CurrentX = (ScaleWidth - tWidth) \ 2
    CurrentY = Transmit_Text.Top - tHeight * 1.5
    Print Text$

End Sub

Sub Form_Paint ()

    PaintText

End Sub