From jacobson@math-cs.cns.uni.edu Mon Jun 10 15:58:02 2002
Date: Mon, 10 Jun 2002 15:57:04 -0500 (CDT)
From: Mark Jacobson <jacobson@math-cs.cns.uni.edu>
To: 810-030-01@uni.edu
Subject: Web page and handouts...

Hi Visual Basic students,

   The web page is now up to date and the URL is:

        http://www.cns.uni.edu/~jacobson/c030.html

   The VB web page is easily found from

        http://www.cns.uni.edu/~jacobson

   Study over today's handout, but be aware that the web page PowerPoint
   presentation has additional material not on the handout that you might
   find useful.

   I also put the code and screen snapshots of today's Visual Basic
   example with its Form_Click() and Form_Load() and cmdClear_Click()
   events.  Recall that the cmdClear_Click() event changed the
   Backcolor or the Forecolor for the frmDemoOne Form object.

   frmDemoOne.Forecolor = RGB(255 * Rnd, 255 * Rnd, 255 * Rnd)
   frmDemoOne.Backcolor = RGB(255 * Rnd, 255 * Rnd, 255 * Rnd)

   ObjectName.ProperyName  =  new property value
   ---------- -----------  =  ------------------

Private Sub cmdClear_Click()      ' <---This is a command button event...
    frmDemoOne.Cls                ' Clear the Screen - Clear screen
End Sub                           '                    --    -

Private Sub Form_Click()
    frmDemoOne.ForeColor = RGB(255 * Rnd, 255 * Rnd, 255 * Rnd)

    Print "Hello World"
    frmDemoOne.Print "Go Panthers"

    frmDemoOne.Caption = Time
End Sub

Private Sub Form_Load()
    MsgBox "Go Panthers"       ' MsgBox for Message Box with OK button...
End Sub

    Properties, Methods and Events

    Print and Cls and Methods, things that Form objects know how to DO.

    Forecolor and Backcolor and Caption are Properties, things that
    enable objects to remember an important characteristic.

    Click() and Load() and KeyPress() are events.  Events are something
    that objects know how to detect and respond to by executing whatever
    statements and actions we specify for the given event.

    Properties, Methods and Events  P, M, E  Three types of things.

    Objects such as command buttons and labels are created by using the
    Toolbox.

    All Objects have properties.  The (Name) property, Caption property,
    Backcolor property, Forecolor property, ...

    Properties can be set at DESIGN time or at RUN time.

    Many objects know how to act or do certain things.  We can tell a
    form to CLEAR itself with the .Cls METHOD.  Or tell it to Print
    on itself, using the Print METHOD.

    See you on Tuesday. You are NOT expected to understand most of
Monday's 1st lecture example and handouts until Wednesday or so.

    Mark